JP2023017614A - impact tool - Google Patents

Abstract

To provide a construction technology which contributes to rationalization of an arrangement structure and operability of a member, concerning an impact tool normally performing a striking operation while facing downward due to self-weight.SOLUTION: An impact tool 100 has a drive mechanism in which a worker grips a pair of handles 130 with left and right hands respectively and a striking operation is performed while being suspended due to self-weight, and which drives a tip end tool in a first direction D1, and a motor. A motor output shaft is provided so as to extend in a third direction defined as a thickness direction intersecting both of the first direction D1 and a second direction D2. A battery installing portion 123 is provided in a side area 114 in the second direction D2 of the body portion 110. The battery installing portion 123 is installed with a battery 150 feeding the motor.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to an impact tool called a so-called large-sized hammer, which normally performs an impact operation downward under its own weight.

An example of an impact tool is disclosed, for example, in Japanese Patent Laying-Open No. 2016-165783 (Patent Document 1).
This Patent Literature 1 discloses a technique for optimizing the arrangement of batteries in a large cordless hammer.

By the way, since the large hammer is heavy, large in size, and high in output, there is a strong demand for streamlining the arrangement of members and operability.
In particular, as part of recent technological developments focused on ESG (or SDGs), there is a strong demand for environmental load reduction, high efficiency, and ergonomic design, and the development of large hammers is no exception.

Large cordless hammers tend to have batteries with higher capacities and larger sizes in order to increase output and improve efficiency, and product development is also progressing on the assumption that multiple battery packs will be installed. Under such circumstances, it is necessary not only to optimize the location of the battery, but also to pursue structural rationalization of the entire tool.

JP 2016-165783 A

In view of the above, it is an object of the present invention to provide a construction technique that contributes to the rationalization of the arrangement and configuration of members and the operability of an impact tool that normally performs an impact operation in a downward facing state due to its own weight. be.

In order to solve the above problems, according to one aspect (aspect 1) of the present disclosure,
When defining an elongated main body portion having a tool holder in a tip region, and defining a longitudinal direction of the main body portion as a first direction and defining a width direction intersecting with the first direction as a second direction, and a pair of handles extending in the second direction, and detachably attached to the tool holder in a state in which an operator holds the pair of handles with left and right hands and hangs down by its own weight. An impact tool that performs an impact operation via a tip tool,
a drive mechanism for driving the tip tool in the first direction; and a motor provided with a motor output shaft for driving the drive mechanism,
The motor output shaft is provided so as to extend in a third direction defined as a thickness direction that intersects both the first direction and the second direction, and extends laterally of the main body in the second direction. A battery mounting part is provided in the region,
The impact tool is configured such that a battery for supplying power to the motor is mounted in the battery mounting portion.

The impact tool is typically suitably applied to an impact tool, that is, a large hammer, whose working mode is to perform an impact operation while facing downward due to its own weight.
Especially for large hammers, it is easy to increase the capacity and size of the battery in order to ensure a large output, and it is important to streamline the configuration of the tool main body to which the battery is attached, along with the rationalization of the battery arrangement configuration.

Therefore, in the impact tool, the output shaft of the motor is provided so as to extend in the third direction defined as the thickness direction intersecting both the first direction and the second direction. That is, the output shaft, which is likely to have the largest dimension among the elements constituting the motor, can be configured to extend in the third direction, which is the thickness direction of the impact tool. At the cost of allocating the output shaft, which is a large-sized portion of the motor, along the third direction, a large space along the second direction, which is the width direction of the impact tool, can be secured as an expansion space.
Accordingly, the battery mounting portion is provided in the side area of the main body portion in the second direction, and even if the battery is relatively easily increased in size, the mountability is improved by utilizing the large secured expansion space. It will be.

In addition, by securing a large space along the second direction, which is the width direction of the impact tool, a relatively heavy battery can be arranged close to the center axis of the main body in the second direction. It is possible to avoid an increase in size of the tool in the width direction, and to improve the overall weight balance, including the reduction of the force couple.

ADVANTAGE OF THE INVENTION According to this invention, the construction|assembly technique which contributes to the arrangement structure of a member, and workability|workability improvement was provided about the impact tool which normally performs an impact operation in the downward facing state by dead weight.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front side (operator side) perspective view which shows the whole structure of the impact tool which concerns on this embodiment. It is a back side perspective view showing the whole composition of an impact tool concerning this embodiment. It is a top view of the impact tool which concerns on this embodiment. It is a front cross-sectional view of the impact tool according to the present embodiment. It is a side (right side) cross-sectional view of the impact tool according to the present embodiment. It is a side (right side) enlarged cross-sectional view of the impact tool according to the present embodiment. It is a front enlarged cross-sectional view showing the configuration of the upper composition of the impact tool according to the present embodiment. FIG. 4 is a plan partial cross-sectional view showing the configuration of the first sliding guide member of the impact tool according to the present embodiment; FIG. 4 is a plan partial cross-sectional view showing the configuration of a second sliding guide member of the impact tool according to the present embodiment; Fig. 10 is a front right perspective view showing the upper internal structure of the impact tool with the head case removed; Fig. 10 is a front left perspective view showing the upper internal structure of the impact tool with the head case removed; It is a top side perspective view which shows the structure of a controller case. It is a bottom side perspective view showing the configuration of the controller case. FIG. 4 is a perspective view showing the configuration of a duct cover; 4 is a perspective view of the structure of the duct cover as viewed from the side of the motor, which is the member to be adhered. FIG. FIG. 4 is a left side partial cross-sectional view showing the mounting structure of the duct member; FIG. 4 is a left side partial cross-sectional view showing the mounting structure of the duct member; It is a perspective view which shows the structure of a detection mechanism. FIG. 4 is a right side partial cross-sectional view showing the configuration of the detection mechanism in a no-load driving state; FIG. 4 is a right side cross-sectional view showing an operation mode of the detection mechanism when switching from a no-load drive state to a load drive state; FIG. 4 is a schematic plan view showing the configuration (handle) of a modification of the impact tool according to the present embodiment; It is a front view which shows the structure (handle) regarding the example of a change of the impact tool which concerns on this embodiment.

Regarding the configuration described above, the following exemplary aspects can be adopted as appropriate. Also, a plurality of exemplary modes can be combined and appropriately used for the above configuration.
(Aspect 2)
The battery mounting portions may be arranged in pairs on both side surfaces of the body portion in the second direction.
As a result, the batteries can be mounted in pairs, and the amount of power supplied can be increased while maintaining the weight balance of the impact tool as a whole.

The term "paired" means that the battery mounting portions on both sides form a pair. However, from the standpoint of increasing the output and capacity, it is possible to install the battery mounting portions separately.
In particular, in relation to the structure that secures a large space along the second direction, which is the width direction of the impact tool, both sides of the main body in the second direction are effectively used, and the rationality of the member arrangement is further increased.

(Aspect 3)
With the battery mounted in the battery mounting portion, the outer shell of the battery can be arranged within an imaginary line connecting the free end region of the handle and the tip region of the main body. The "virtual line" referred to here is assumed to be a straight imaginary line connecting the free end region of the handle and the tip region of the main body at the shortest distance.
As a result, it is possible to prevent the battery mounted in the battery mounting part from projecting outward unnecessarily and deteriorating the workability, and to effectively avoid damage to the battery when the impact tool is overturned.

(Aspect 4)
Each of the handles may have a grasping portion that extends linearly and is provided for grasping by an operator.
As a result, a gripping portion structure that can be easily gripped with both left and right hands can be ensured, contributing to improvement in workability.

(Aspect 5)
In the first direction, when the direction from the handle to the tool holder is defined as downward, and the direction from the tool holder to the handle is defined as upward, the battery mounting portion is positioned in the direction of the handle in the first direction. can be provided in the area immediately below the lower side of the
As a result, it is possible to improve the weight balance of the impact tool, and further improve workability, such as performing battery replacement work while holding the handle.

(Aspect 6)
The battery mounting portion can be configured so that the battery can be slidably mounted in a crossing manner with respect to the first direction.
As a result, the sliding mounting direction of the battery can be set so as to intersect the first direction in which vibration is likely to occur during impact work, so that unintended dropout of the battery due to vibration can be effectively prevented.

(Aspect 7)
The drive mechanism has a motion conversion mechanism that converts rotational motion of the motor output shaft into linear motion in the first direction, and the battery mounting portion overlaps the motion conversion mechanism with respect to the first direction. can be provided in the form of
As a result, the motion conversion mechanism and the battery, which tend to be relatively heavy, can be arranged in a centralized manner, thereby improving the weight balance of the impact tool as a whole.

(Aspect 8)
The motion converting mechanism can be arranged on a side of the main body section that is spaced apart from the operator in the third direction.
As a result, it is possible to optimize the arrangement of the motion converting mechanism, which tends to be relatively heavy, and improve the weight balance of the impact tool as a whole.

(Aspect 9)
The main body may have a battery protector for protecting an outer shell of the battery mounted in the battery mounting area.
The battery protector can typically be composed of a cover that covers at least part of the battery shell, or a storage box that houses at least part of the battery shell. As a result, it is possible to ensure the protection of the battery or the battery mounting part by the external force.

(Mode 10)
The pair of handles may be formed in an annular shape when viewed in the first direction.
Thereby, it can contribute to the improvement of a worker's graspability. Note that "annular" can be set from various shapes such as a circular ring and a rectangular ring. Further, it is possible to employ a mode in which the handle itself is formed in a ring shape, a mode in which the main body and the handle are combined to form a ring as a whole, and the like.

Forming the pair of handles in an annular shape also leads to a greater range of options for the operator as to which part of the handles to grip.
As a result, workability is further improved based on ergonomic design.

(Aspect 11)
The battery mounting portion may be provided within the annular portions of the pair of handles when viewed in the first direction. That is, the pair of handles can also serve as a guard section against the external force applied to the battery mounted in the battery mounting section.
As a result, it is possible to simultaneously improve the operator's graspability and improve the battery protection ability from external force, which is rational.

It should be noted that "within the annular portions of the pair of handles" refers to either a mode in which the entire battery mounting portion is provided within the annular portion, or a mode in which at least a partial region of the battery mounting portion is provided within the annular portion seat in the first direction. is also preferably included.

An impact tool 100 according to this embodiment will be described below with reference to FIGS. 1 to 20. FIG.
1, 2, and 3 show the overall configuration of the impact tool 100 as a front perspective view, a rear perspective view, and a plan view, respectively.
4 and 5 show a front cross-sectional view and a side cross-sectional view of the impact tool 100, respectively, FIG. 6 is a partially enlarged side cross-sectional view of the impact tool 100, and FIG. A cross-sectional view is shown.
In this embodiment, for convenience, the side facing the worker is the front of the impact tool 100 .

In the present embodiment, for convenience of explanation, the longitudinal direction of the impact tool 100 (also referred to as the longitudinal direction: the vertical direction in FIG. 1) is defined as the first direction D1.
Further, the width direction (also referred to as the left-right direction: the left-right direction in FIG. 1) that intersects with the longitudinal direction is defined as a second direction D2.
A thickness direction of the impact tool 100, which is a direction perpendicular to the first direction D1 and the second direction D2, is defined as a third direction D3.
Further, with respect to the first direction D1, the downward direction on the page of FIG. 1 is defined as D1D, and the upward direction on the page is defined as D1U.

(overall structure)
As shown in FIGS. 1 to 6, the impact tool 100 generally has a first housing 110 and a second housing 120 in appearance.
The second housing 120 is connected to the upper side of the first housing 110 and is movable relative to the first housing 110 in the first direction D1.
(Configuration of first housing 110)
The first housing 110 is formed in an elongated shape and has an upper drive mechanism accommodation portion 111 , a lower drive mechanism accommodation portion 112 , and a tip region 113 .
Further, side areas 114 are formed in the upper drive mechanism accommodating portion 111 and the lower drive mechanism accommodating portion 112 on the second direction D2 side.
The upper drive mechanism housing portion 111, the lower drive mechanism housing portion 112, and the distal end region 113 are arranged in this order from the upper side to the lower side in the first direction D1 so as to be connected to each other.

The upper drive mechanism housing portion 111 mainly houses the motor 210 and the motion conversion mechanism 170 . The lower drive mechanism housing portion 112 mainly houses the striking mechanism 180 . The motion converting mechanism 170 and the striking mechanism 180 are structural examples corresponding to the "driving mechanism".
Details of the motor 210, the motion conversion mechanism 170, and the impact mechanism 180 will be described later.
Tip region 113 is provided with tool holder 240 and retainer 250 .
The tool holder 240 is a tool mounting member used for impact work, and the retainer 250 functions as a member for preventing the tip tool mounted on the tool holder 240 from coming off.
In the drawings, illustration of the tip tool is omitted for the sake of convenience.

(Configuration of second housing 120)
The second housing 120 is provided on the upper side of the first housing 110 so as to be connected in the first direction D1. The second housing 120 has a head case 121 , a handle mounting portion 122 and a battery mounting portion 123 .
The head case 121 constitutes the outer shell of the second housing 120 and mainly accommodates the controller 260 and the controller case 270 (see also FIGS. 10 and 11). A cooling air intake port 127 is provided in the top surface portion of the head case 121 in the first direction upward D1U.

The handle attachment portions 122 are paired in the second direction D2 and integrally connected to the head case 121, and a handle 130, which will be described later, is attached thereto.
The battery mounting portions 123 are provided in a pair in the second direction D2, and are connected to the handle mounting portion 122 on the lower side D1D in the first direction, respectively.

Battery mounting portion 123 is configured to be arranged in side region 114 of first housing 110 and in region 130A of second housing 120 immediately below handle mounting portion 122 in first direction D1.
Also, the battery mounting portion 123 has a slide guide 124 and a power supply terminal 125 for battery mounting (see FIG. 4).
Each battery mounting portion 123 also has a battery protector 128 for protecting the outer shell of the battery 150 mounted in the battery mounting portion 123 from an external force.

The battery mounting portion 123 including the head case 121, the handle mounting portion 122, and the battery protector 128 is connected and integrated to form the second housing 120, and is integrated with the first housing 110 in the first direction D1. It is configured to be relatively movable in a shape. The detailed configuration of the relative movement of the second housing 120 with respect to the first housing 110 will be described later.

(Configuration of handle 130)
The handle 130 has a pair of first handle portion 131 and second handle portion 141 that protrude from the first housing 110 in the second direction D2.
Typically, the first handle portion 131 is gripped by the operator's right hand, and the second handle portion 141 is gripped by the operator's left hand.
The first handle portion 131 has a first handle base portion 132, a first handle gripping portion 133 and a free end region 134, as shown in detail in FIG. A trigger 135 is provided on the first handle grip portion 133 . The trigger 135 is always urged to the OFF position, and can be moved to the ON position while resisting the urging force to the OFF position by manually pressing the first handle portion 131 while holding it. be. 1-4 show the trigger 135 in its off position (initial state).

When the operator releases the trigger 135 from pressing, the trigger 135 returns to the initial state due to the biasing force toward the OFF position. As shown in FIG. 4, the trigger 135 is connected to an electric switch 136 provided inside the handle mounting portion 122. When the trigger 135 moves to the ON position, the electric switch 136 is turned on, which will be described later. An ON signal is sent to the controller 260 .
The second handle portion 141 has a second handle base portion 142 , a second handle gripping portion 143 and a free end region 144 .

(Configuration of Battery 150)
As shown in FIGS. 1 to 3, the battery 150 has a substantially rectangular cuboid shape having a battery front surface portion 151, a battery top surface portion 152, a battery bottom surface portion 153, and a battery rear surface portion 154. It is configured as a package body containing.
An unlocking portion 155 is provided in a region of the battery upper surface portion 152 close to the battery rear surface portion 154 . The unlocking portion 155 is manually operated when the battery 150 is removed from the second housing 120 .
The battery 150 is mounted on the battery mounting portion 123 of the second housing 120 by sliding in the battery mounting direction 156 as shown in FIG. As a result, the battery 150 is electrically connected to the power supply terminal 125 while being engaged with the slide guide 124 in the battery mounting portion 123 , and is placed in a state in which power can be supplied to the impact tool 100 .

The battery mounting direction 156 is defined as a direction that crosses (perpendicularly) the first direction D1 and the second direction D2 and along the third direction D3.
On the other hand, the battery 150 is removed from the second housing 120 by manually operating the unlocking portion 155 and sliding in the direction opposite to the battery mounting direction 156 . In other words, the battery mounting direction 156 and the removing direction (direction opposite to the battery mounting direction 156) intersect (perpendicularly) with respect to the first direction D1 and the second direction D2.

The battery protector 128 described above covers the battery front surface portion 151, the battery top surface portion 152, and the battery bottom surface portion 153 (and part of the battery side surface portion) while the battery 150 is mounted on the battery mounting portion 123, and protects the battery 150. Protect from external forces.
In other words, battery protector 128 is configured as a cover member that covers all or part of battery front surface portion 151 , battery top surface portion 152 , and battery bottom surface portion 153 .
Further, as shown in FIG. 4, an LED light 129 is provided on the lower surface of the battery protector 128 (downward D1D in the first direction) for illuminating the tip region 113 or the end of the tip tool. The LED light 129 is one of the functional members that assists the performance of the striking work.

In this embodiment, the battery 150 attached to the battery attachment portion 123 is connected to the battery protector 128 and the free end regions 134 and 144 of the first handle portion 131 and the second handle portion 141 as shown in FIG. , inside the imaginary line HL connecting the tip region 113 of the first housing 110 (the side closer to the impact tool 100 than the imaginary line HL).
This prevents the battery 150 and the battery protector 128 attached to the battery attachment portion 123 from interfering with the striking operation. Also, in the unlikely event that the impact tool 100 falls over, the battery 150 (and the battery protector 128) is placed inside the imaginary line HL assumed as the ground line, thereby avoiding the impact at the time of the fall. , the protection from external forces is further improved.

(Configuration of motor 210)
As shown in FIGS. 5 and 6, the motor 210 mainly includes a stator 211, a rotor 212, an output shaft 213 integrally connected to the rotor 212, and a cooling fan 214 integrally connected to the output shaft 213. Configured. A centrifugal fan is employed as the cooling fan 214 in this embodiment.
Each element of the motor 210 is housed within the motor housing 215 and located within the first housing 110 .
The output shaft 213 is connected to the first intermediate shaft 171 of the motion conversion mechanism 170 on the side opposite to the operator in the third direction D3 so as to be capable of transmitting rotation at a predetermined speed reduction ratio. is transmitted from the output shaft 213 to the motion conversion mechanism 170 via the first intermediate shaft 171 .
Further, in this embodiment, a brushless motor is employed as the motor 210 in order to obtain a relatively large output while being relatively small in size. Since the structure of the brushless motor itself belongs to well-known technology, its detailed description is omitted in this specification.

The output shaft 213 is arranged to intersect the first direction D1 and the second direction D2 and extend along the third direction D3. In other words, the output shaft 213 of the motor 210, which tends to be the largest, extends in the third direction D3, which is the thickness direction of the impact tool 100. A large dimension 210 is allocated, and instead, a large space for arranging other functional members is secured along the second direction D2, which is the width direction of the impact tool 100 .

Specifically, as shown particularly in FIGS. 1 and 4, it becomes easier to secure a space in the side area 114 of the first housing 110 in the second direction D2. In the present embodiment, the expansion space S secured in the side area 114 is used to provide the battery mounting portion 123 as a part of the second housing 120, and the battery 150 is installed in the battery mounting portion 123. Even if the battery protector 128 is installed or the battery protector 128 is placed, space efficiency is optimized so as not to interfere with work.

(Configuration of Motion Conversion Mechanism 170)
As shown in FIGS. 5 and 6, the motion conversion mechanism 170 mainly includes a first intermediate shaft 171, a second intermediate shaft 172, a crank mechanism 173, a cylinder 174, a piston 175, an air chamber 176, and a damping mechanism 177. be done.
As described above, the first intermediate shaft 171 is connected to the output shaft 213 of the motor 210 so as to transmit rotation, and furthermore, the first intermediate shaft 171 is connected to the second intermediate shaft 172 so as to transmit rotation at a predetermined reduction ratio. be done.
The second intermediate shaft 172 is integrally connected to the crank mechanism 173 and is also connected to drive the vibration damping mechanism 177 .

The crank mechanism 173 converts the rotational motion of the second intermediate shaft 172 about the third direction D3 into linear motion in the first direction D1, and linearly reciprocates the piston 175 in the first direction D1. The linear motion of the piston 175 causes pressure fluctuations in the air chamber 176 inside the cylinder 174 .

The damping mechanism 177 has a counterweight 178 linearly reciprocating along the outer periphery of the cylinder 174 in the first direction D1. The counterweight 178 is a member that acts in opposition to the striking action of the striking mechanism 180, which will be described below, and suppresses the vibration that occurs in the striking tool 100 during the striking operation.

(Configuration of impact mechanism 180)
As shown in FIGS. 5 and 6, the striking mechanism 180 is mainly composed of a striker 181 and an impact bolt 182. As shown in FIGS. As described above, when pressure fluctuations occur in the air chamber 176 inside the cylinder 174, the striker 181, which is also arranged inside the cylinder 174 so as to face the piston 175 across the air chamber 176, linearly moves in the first direction D1. , linearly moves the impact bolt 182 in the first direction D1.

As a result, the impact bolt 182 linearly moves the tip tool (not shown for convenience) mounted in the tool holder 240, and the tip tool performs an impact operation in the first direction D1.
The retainer 250 prevents the tip tool from coming off in the first direction D1.
The retainer 250 can move between a tip tool retaining position (corresponding to FIG. 5) and a releasing position by rotating around a rotation center 251 in FIG.

(Structure of first sliding guide member 190)
As described above, the first housing 110 and the second housing 120 are configured to be relatively movable in the first direction D1.
In this embodiment, as shown in FIGS. 7 to 9, a first sliding guide member 190 and a second sliding guide member 200 are provided to facilitate the relative movement.
The first sliding guide member 190 is provided at a position close to the handle 130 (a height position substantially equal to the handle 130) in the first direction D1. The first sliding guide member 190 has a pipe-shaped member 191 that is a component on the first housing 110 side and a bifurcated member 192 that is a component on the second housing 120 side. The bifurcated member 192 is literally a member having a bifurcated pair of parts, and is also called a forked member or a bifurcated member.
The pipe-shaped member 191 is made of metal, has a circular cross section, and is fixedly arranged in the first housing 110 so that its major axis faces the first direction D1.
The bifurcated member 192 is made of resin and is fixed to the handle mounting portion 122 of the second housing 120 integrally with the handle 130 . The bifurcated member 192 is loosely fitted in the pipe-shaped member 191 with the bifurcated portion along the outer peripheral surface of the pipe-shaped member 191, and slides on the pipe-shaped member 191 in the first direction D1. It is configured to be relatively movable in a shape.
In this embodiment, a plurality of first sliding guide members 190 are arranged around the first direction D1 (as shown in FIG. 8, two are arranged facing each other and in pairs).

(Configuration of second sliding guide member 200)
The second sliding guide member 200 is arranged on the lower side D1D in the first direction than the first sliding guide member 190 described above. Specifically, it is provided at a position close to the battery 150 (a height position substantially equal to the battery 150) in the first direction D1.
The second sliding guide member 200 has a convex member 201 , a concave member 202 and a sliding guide 203 .

The convex member 201 is made of resin, is fixedly provided on the side of the first housing 110, and is configured to protrude outward in the second direction D2 as shown in FIG.
The concave member 202 is made of resin, is provided on the second housing 120 side, and is fitted with the convex member 201 so as to be relatively slidable in the first direction D1, as shown in FIG.
The sliding guide 203 is formed by bending a thin sheet metal, and is welded and fixed to the first housing 110 as shown in FIG. As a result, the relative sliding motion between the convex member 201 and the concave member 202 is guided while reinforcing the rigidity.
Furthermore, in the present embodiment, a plurality of second sliding guide members 200 are arranged around the first direction D1 (as shown in FIG. 9, two are arranged facing each other in a pair).

A buffer member 205 is provided on the second slide guide member 200 . The cushioning member 205 can come into contact with the cushioning member contact seat 126 on the second housing 120 side.
The cushioning member contacting seat 126 has a wedge-shaped cross section and is integrally formed with the battery mounting portion 123 of the second housing 120 .
The cushioning member 205 is made of an elastic material such as rubber, urethane, or sponge, and is fixedly attached to the first housing 110 . Specifically, the cushioning member 205 is provided on the back side of the convex member 201 as shown in FIG.
The cushioning member 205 is compressed by the cushioning member contact seat 126 on the side of the second housing 120 when the first housing 110 and the second housing 120 relatively move toward each other. The compression buffers the relative movement between the first housing 110 and the second housing 120 .

The impact tool 100 according to this embodiment further has a stopper 204 .
As shown in FIG. 7, the stopper 204 receives the bifurcated member 192 on the second housing 120 side so that the maximum relative movement distance (that is, the movable distance) between the first housing 110 and the second housing 120 in the first direction D1 is achieved. stroke distance).

(Arrangement of multiple sliding guide members)
In this embodiment, in the first direction D1, the first sliding guide member 190 constitutes a handle-approaching-side sliding guide member, and the second sliding guide member 200 constitutes a handle-separating-side sliding guide member. By supporting the relative movement operation of the first housing 110 and the second housing 120 in the first direction D1 with a plurality of sliding guide members, the stability of the operation is ensured.
Further, as shown in FIGS. 8 and 9, a plurality of first sliding guide members 190 and second sliding guide members 200 are arranged around the first direction D1, respectively, so that the first housing 110 and the second sliding guide member 200 are further arranged. This configuration ensures the stability of the relative movement of the housing 120 .

(anti-vibration structure)
As shown in FIGS. 4 and 7, the first housing 110 and the second housing 120 are biased in the first direction D1 by interposing the first elastic body 161 and the second elastic body 162. It is configured such that it is possible to move relative to each other (approaching/separating) in the state of being held.
Metal coil springs are used for the first elastic body 161 and the second elastic body 162 in this embodiment. Others, such as leaf springs, rubber, soft resin, actuators, etc., can also be used.

The first elastic body 161 is interposed between the first housing 110 and the second housing 120 on the lower D1D side in the first direction than the handle 130 . In this embodiment, the first elastic bodies 161 are configured as a pair of pair structures.
The lower end of the first elastic body 161 is attached to the first elastic body mounting seat 120A provided in the upper drive mechanism accommodating portion 111, as shown in FIG.
On the other hand, the upper end of the first elastic body 161 is placed in a free end state while the pressing seat 120C is attached.
The pressing seat 120</b>C has an L-shaped cross section when viewed from the front in FIG. 7 , and the bottom of the L-shaped cross section is fitted to the upper end of the first elastic body 171 . On the other hand, the upper end of the L-shaped cross section is arranged to face the bifurcated member 192 on the first housing 110 side.

The upper end portion of the pressing seat 120C and the bifurcated member 192 of the first sliding guide member 190 are opposed to each other with a predetermined clearance 190CL before the striking operation is started (initial state). In this embodiment, the clearance 190CL is set to 2 millimeters (2 mm).

When the first housing 110 relatively moves downward in the first direction D1D and comes close to the second housing 120, first, the bifurcated member 192 descends along the pipe-shaped member 191 by a distance corresponding to the clearance 190CL. The elastic body 161 abuts on the upper end of the pressing seat 120C.

Furthermore, the bifurcated member 192 compresses the first elastic body 161 via the pressing seat 120C by relatively moving the first housing 110 downward in the first direction D1D. As a result, the biasing force of second elastic body 162 generated in response to compression acts between first housing 110 and second housing 120 .

In the first direction D1, the first elastic body 161 in this embodiment includes a first sliding guide member 190 that is a sliding guide member on the side close to the handle and a second sliding guide member that is a sliding guide member on the side away from the handle. It is located between 200. Therefore, the biasing force can be applied in a so-called both-ends supported state, and adverse effects (eg, generation of tilting force during relative movement) due to components of the biasing force other than in the first direction D1 can be avoided.
In addition, the first elastic body 161 is arranged in a region immediately below the first sliding guide member 190 in the first direction D1 to improve the anti-vibration effect on the handle 130 .

On the other hand, the second elastic body 162 in this embodiment is interposed between the first housing 110 and the second housing 120 on the upper D1U side in the first direction from the handle 130 .
In this embodiment, the second elastic bodies 162 are configured as a pair of pair structures (see also FIG. 10 and the like).
One end (upper D1U side in the first direction) of each second elastic body 162 is attached to a second elastic body attachment portion 278 (on the second housing 120 side) of the controller case 270 . The detailed structure of the controller case 270 is also shown in FIGS. 12 and 13. FIG. On the other hand, the other end of each second elastic body 162 (downward D1D side in the first direction) is attached to the second elastic body mounting seat 120B (first housing 110 side).
Thus, the second elastic body 162 is interposed between the first housing 110 and the second housing 120 .

When the operator holds the handle 130 and presses downward in the first direction D1D, the second housing 120 integrated with the handle 130 resists the biasing force of the second elastic body 162. , and move relatively downward in the first direction D1D to approach the first housing 110 .

The first elastic body 161 and the second elastic body 162 are
"elastic modulus of the first elastic body 161>elastic modulus of the second elastic body 162"
is set to be
Specifically, the first elastic body 161 (coil spring in this embodiment) can effectively suppress the transmission of vibrations generated on the first housing 110 side to the second housing 120 side during striking work. The elastic modulus is set to a relatively large degree, that is, to sufficiently secure the anti-vibration housing structure of the impact tool 100 .

On the other hand, the second elastic body 162
(1) A weight corresponding to the weight of the second housing 120, each functional member attached to the second housing, and the battery 150, in other words, a heavy object on the side of the second housing 120 when the striking operation is not performed. can be held in a state separated from the first housing 110,
and,
(2) When starting impact work, the operator presses the handle 130 downward in the first direction D1D to the extent that the second housing 120 can be relatively moved toward the first housing 110 side. For example, the elastic constant is determined to be such that the second housing 120 can be easily manually pressed toward the first housing 110 .

(Internal configuration of first housing 110 with head case 121 removed)
10 and 11 show the upper internal configuration of the impact tool 100 with the head case 121 shown in FIG. 1 removed.

FIG. 10 shows the upper internal structure of the impact tool 100 with the head case 121 removed as viewed from the front right side. On the other hand, FIG. 11 shows the upper internal structure of the impact tool 100 with the head case 121 removed as viewed from the front left side.
The second housing 120 connected to the first housing 110 on the upper D1U side in the first direction holds the controller 260, the controller case 270 holding the controller 260, the main power switch 281, the communication unit 282, and the detection mechanism 290. .

The controller 260 is a member that mainly controls the driving of the motor 210 described above. The controller 260 is configured as an assembly in which a control board is accommodated and heat radiation fins 261 are formed on the upper surface, that is, a control board assembly. Also, the control board mainly has a CPU, a memory, and the like.
The main power switch 281, the communication unit 282, and the detection mechanism 290 all constitute a functional member 280 for assisting the impact tool 100 in performing impact work.

The second housing 120 is connected to the first housing 110 with the second elastic body 162 interposed therebetween while holding the above members. The biasing force of second elastic body 162 acts on both first housing 110 and second housing 120 in first direction D1.

On the other hand, the first housing 110 holds a motor housing 215 in which the motor 210 is accommodated at its upper end on the D1U side in the first direction. A duct cover 220 is connected to the motor housing 215 . The duct cover 220 , which is also shown in FIG. 6 , is connected to the motor housing 215 at the end region of the output shaft 213 of the motor 210 facing the cooling fan 214 .
Also, as shown in FIG. 11 , a duct member 230 is connected between the duct cover 220 and the controller case 270 .

The detailed configuration of each member will be described below in order.
(Configuration of Controller Case 270)
A detailed configuration of the controller case 270 is shown in FIGS. 12 and 13. FIG. 12 is a top perspective view of the controller case 270, and FIG. 13 is a bottom perspective view of the controller case 270. FIG.
The controller case 270 is mainly composed of a frame 271 having a frame structure that functions as a holding portion for the controller 260. The frame 271 includes a duct member mounting portion 272, a head case mounting portion 273, a detection mechanism mounting portion 274, a main power source, and a main power source. The switch mounting portion 275, the communication unit mounting portion 276, the wire harness insertion opening 277, and the second elastic body mounting portion 278 are integrally molded.
Although not shown, lead wires (electrical wires) for electrically connecting the controller 260 to the battery 150, the motor 210, the electric switch 136, etc. are inserted and held in the wire harness insertion openings 277. FIG. Either a single lead wire (single wire) or a bundled lead wire can be used.

(Structure of Duct Cover 220)
A detailed structure of the duct cover 220 is shown in FIGS. 14 and 15 as perspective views.
FIG. 14 is a front perspective view of the duct cover 220, and FIG. 15 is a perspective view of the duct cover 220 viewed from the side of the motor 210, which is an adhered member.
The duct cover 220 has an internal space 221 , a motor mounting seat 222 , a flange 223 , a cooling air guide path 224 and a duct member mounting portion 225 . The cooling air that has cooled the controller 260 is configured to be sent to the motor 210 through the duct member mounting portion 225 of the duct cover 220, the cooling air guide path 224, and the internal space 221 (see also FIG. 11). ).

The duct cover 220 configured in this way is screwed to the motor housing 215 using the motor mounting seat 222 (see also FIGS. 10 and 11).
As shown in FIG. 6, the duct cover 220 is provided on the output shaft 213 of the motor 210 in the third direction D3 on the side opposite to the side on which the cooling fan 214 is attached (the operator side). It is attached to the motor housing 215 . Therefore, when the cooling fan 214 rotates together with the output shaft 213, the cooling air flows through the duct member attachment portion 225, the cooling air guide path 224, and the internal space in the duct cover 220 shown in FIG. 221 to the motor housing 215, and further advects within the motor housing 215 along the output shaft 213 in the third direction D3. This is configured to cool the motor 210 housed in the motor housing 215 .

(Structure of duct member 230)
Details of the duct member 230 are shown in FIGS. 11, 16 and 17 .
16 is a second direction cross-sectional view of the left side surface cut in the first direction D1 so as to pass through the central axis of the first end portion 232 of the duct hose 231 in FIG. 11, and FIG. 23 is a cross-sectional view of the left side in the first direction D1 so as to pass through the central axis of the second end portion 233 of 231 in the second direction.
The duct member 230 is a member for supplying the cooling air that has cooled the controller 260 to the motor housing 215, and is mainly composed of the duct hose 231. As shown in FIG.

The duct hose 231 has a first end 232 connected to the duct member mounting portion 272 of the controller case 270 (see also FIGS. 12 and 13), and a second end 233 connected to the duct member mounting portion 225 of the duct cover 220. connected to
Thereby, the duct member 230 is interposed between the first housing 110 and the second housing 120 .

As shown in FIG. 16, the first end portion 232 of the duct hose 231 is directly and fittedly attached to the duct member attachment portion 272 of the controller case 270 . In other words, the first end portion 232 is directly fitted to the duct member mounting portion 272 without using an auxiliary device such as an adapter (without an adapter).
Further, as shown in FIG. 17, the second end portion 233 of the duct hose 231 is directly and fittedly attached to the duct member attachment portion 225 of the duct cover 220 connected to the motor 210 . In other words, the second end portion 233 is directly fitted to the duct member mounting portion 225 without using an auxiliary device such as an adapter (without an adapter).

The duct hose 231 in this embodiment is configured by a member that exerts an urging force on the contraction side so that when it is stretched from a predetermined initial state, it returns to the initial state. In this embodiment, a hose with a bellows structure is adopted.
In this embodiment, the duct hose 231 that is stretched by a predetermined amount from the initial state is arranged between the first housing 110 and the second housing 120 in a connected manner. Therefore, the duct hose 231 is placed in a state in which an urging force is always applied to the contraction side so as to return to the initial state.
As a result, the duct hose 231 always tries to contract, so that it does not unnecessarily loosen in the impact tool 100, and even when the first housing 110 and the second housing 120 move relative to each other, the duct hose 231 does not rub against other members. A structure is obtained which avoids wear due to excessive wear.
Specifically, by adopting the anti-vibration structure, the connection distance between the first housing 110 and the second housing 120 by the duct hose 231 is shortened from the initial state. In this case, if the duct hose 231 were not biased toward the contraction side, unnecessary slack would occur in the duct hose 231 due to the shortening of the connection distance, and the slack would rub against other members. etc. In this embodiment, by adopting the duct hose 231 in which a biasing force acts on the contraction side so as to return to a predetermined initial state, such a problem can be prevented.

Further, as shown in FIG. 11, the first end 232 of the duct hose 231, that is, the cross section of the end on the side of the controller case 270, which is on the upper side D1U in the first direction, is formed in the second direction D2 and the third direction D3. It is considered to be an aspect that In other words, the central axis of the upper end side of the duct hose 231 is arranged along the first direction D1.
On the other hand, the second end 233 of the duct hose 231, that is, the cross section of the end on the side of the duct cover 220, which is on the lower side D1D in the first direction, is defined by the first direction D1 and the second direction D2. In other words, the central axis of the lower end side of the duct hose 231 is arranged along the third direction D3.

As a result, the cross sections of the first end portion 232 and the second end portion 233 are configured to intersect each other. That is, the central axis of the first end portion 232 is along the first direction, and the central axis of the second end portion 233 is along the second direction D2, so that the central axes are intersecting (substantially orthogonal). . This configuration particularly prevents the duct hose 231 from being twisted or unnecessary when the duct hose 231 is connected between members whose distance is relatively changed in a vibration isolation structure in which the first housing 110 and the second housing 120 move relative to each other. It is advantageous from the viewpoint of avoiding the addition of tension.

Also, the first end 232 of the duct hose 231 is configured to be located in the vicinity upper region of the cooling fan 214 of the motor 210 (see also FIGS. 4, 5, etc.).
Further, as shown in FIG. 16 and the like, the head case 121 is provided with a cooling air intake port 127A corresponding to at least the end of the controller case 270 facing the duct member mounting portion 272 . The cooling effect of the controller 260 is enhanced by the long flow of the cooling air from the cooling air intake port 127A to the first end 232 of the duct hose 231 attached to the duct member attachment portion 272 located at the opposite end. It is a configuration for improving In this embodiment, the cooling air intake port 127 is formed not only at the end facing the duct member mounting portion 272, but also at the central portion of the top surface of the head case 121, thereby improving the cooling air intake efficiency. Improvements are being made.
Further, as shown in FIG. 11, the duct hose 231 is placed in a state in which the curved shape of the central portion is generally held by the duct portion guide ribs 116 provided on the motor housing 215 .

(Structure of functional member 280)
In this embodiment, as shown in FIGS. 3, 10, and 11, various functional members 280 for assisting the performance of impact work by the impact tool 100 include a main power switch 281, a communication unit 282, and a detection mechanism 290. is provided.
The main power switch 281 is a start switch for placing the impact tool 100 in an energized state. When the operator manually turns on the main power switch 281 , power is supplied from the battery 150 and the driving control of the impact tool 100 by the controller 260 is started.
When the main power switch 281 is manually turned on by the operator, the main power switch 281 is basically maintained at the on position until the operator manually returns the main power switch 281 to the off position.
However, in this embodiment, from the viewpoint of energy saving, etc., it is set to automatically return to the OFF position when the non-operating state continues for 60 seconds after turning on the ON position.
Also, when the main power switch 281 is turned on, the operator is notified of the turned-on state by lighting the operation lamp.

The communication unit 282 is a member for sending a drive control signal to an attachment member (auxiliary machine) used for impact work together with the impact tool 100 .
A dust collector is used as the attachment member in this embodiment.
As a communication method, Wi-Fi, Bluetooth, etc. are used.

(Configuration of detection mechanism 290)
Further, the configuration of the detection mechanism 290, which is one of the components of the functional member 280, will be described.
18 and 19 show the basic configuration of the detection mechanism 290. FIG.
The detection mechanism 290 has an assembly body base 291 , a movable member 292 provided with a magnetic body, a movable member biasing elastic body 293 and a magnetic sensor 294 .
The detection mechanism 290 is attached to the detection mechanism attachment portion 274 of the controller case 270 (see also FIGS. 12 and 13).
Also, the detection mechanism 290 is connected to the controller 260 by a wire harness (not shown) for convenience (see FIG. 10, etc.).

The movable member 292 is movable in the first direction D1 while being held by the assembly base 291 . The movable member biasing elastic body 293 is interposed between the movable member 292 and the assembly body base portion 291 and constantly applies a biasing force to the movable member 292 downward in the first direction D1D.
As shown in FIG. 19, the lower end of the movable member 292 faces the upper end of the duct cover 220, and is configured to form a predetermined clearance 290CL in the initial state before the impact operation is performed. there is In this embodiment, the clearance 290CL is set to 1 mm (millimeters).

In this embodiment, in the initial state, the sensor 294 keeps detecting the magnetism of the movable member 292 . In other words, the controller 260 determines that the detection mechanism 290 is in the initial state when the sensor 294 detects the magnetism on the movable member 292 side.
On the other hand, as shown in FIG. 20, when the first housing 110 and the second housing 120 move relatively close to each other, the clearance 290CL disappears with the relative movement, and the lower end of the movable member 292 and the duct cover 220 are separated. are placed in contact with each other.

From this state, when the first housing 110 and the second housing 120 relatively move toward each other, the duct cover 220 pushes the movable member 292 to the first position while resisting the biasing force of the movable member biasing elastic body 293 . It is configured to be pushed upward in the direction D1U. When the movable member 292 moves upward in the first direction D1U, the sensor 294 stops detecting magnetism (stops detecting magnetism), and the controller 260 detects pressing of the impact tool 100 through the detection mechanism 290. FIG.
That is, the detection mechanism 290 serves as a so-called push drive sensor.
In this embodiment, the impact tool 100 is switched from the non-load driving state to the load driving state by detecting the pressing force, and the detailed operation mode thereof will be described later.

(Mode of operation of impact tool 100 according to this embodiment)
The operation mode of the impact tool 100 according to this embodiment will be described below.
The impact tool 100 according to the present embodiment is configured as a so-called large-sized hammer, and is normally in a working mode in which the impact tool 100 hangs down due to its own weight and strikes downward.
It should be noted that the term “drooping” or “downward” as used herein can include not only the direction that completely matches the first downward direction D1D, but also other directional components.

(Energization of motor 210: soft no-load start)
When an operator performs an impact operation using the impact tool 100, first, the handle 130 is gripped by hand, and the impact tool 100 is suspended by its own weight (the tool holder 240 faces downward in the first direction D1D). In addition, the main power switch 281 is manually turned on.
Further, the operator manually pushes the trigger 135 while gripping the handle 130 . The controller 260 rotationally drives the motor 210 at a predetermined first speed (first rotation speed) R1 based on the turning on of the main power switch 281 and the turning on of the trigger 135 .

A specific set value of the first speed R1 is determined, for example, according to an idling setting that enables the power consumption to be appropriately reduced while preparing for a smooth transition to the normal driving operation (load driving state) thereafter. By setting the first speed R1 to a relatively low speed range, vibration generated in the impact tool 100 via the damping mechanism 177 is reduced as much as possible. This point will be described later.

The reason why turning on both the main power switch 281 and the trigger 135 is a condition for energizing the motor 210 is to thoroughly prevent malfunction of the impact tool 100 . Further, from the viewpoint of thoroughly preventing malfunction, even if the trigger 135 is turned on before the main power switch 281 is turned on, it is set not to be energized.
In this embodiment, as described above, a brushless motor is employed as the motor 210, and the controller 260 drives and controls the motor 210 by so-called PWM control in response to turning on the main power switch 281 and the trigger 135. FIG.

(Definition of no-load drive state of impact tool 100)
In this embodiment, a state in which the motor 210 is driven and the second housing 120 is not pressed against the first housing 110 is defined as a "no-load driving state."
This "no-load driving state" can also be defined as the following state. (1) Initial state before start of striking work.
(2) A state in which no load other than its own weight acts on the tip tool, i.e., the tip tool is not intentionally pressed against the machining work object (except for its own weight) and is driven with "no load". state.
or,
(3) A state in which the operator does not press the handle 130, that is, a state in which no relative movement is performed between the first housing 110 and the second housing 120, or a state in which the first elastic body 161 and the second elastic body A state in which none of the bodies 162 are compressed.
Note that the no-load driving state is also called a "no-load driving state" or the like.

(Operation of Motion Conversion Mechanism 170)
When the motor 210 is rotationally driven, as shown in FIGS. 5 and 6, the rotational output of the output shaft 213 of the motor 210 around the third direction D3 is transmitted to the first intermediate shaft 171 and the second intermediate shaft 172. is converted into linear motion in the first direction D1 by the crank mechanism 173, whereby the piston 175 linearly moves in the first direction D1 within the cylinder 174. As shown in FIG. Similarly, the damping mechanism 177 mainly including the counterweight 178 performs linear motion in the first direction D1 on the outer periphery of the cylinder 174 with different phases.

When the impact tool 100 is placed in a no-load driving state, the impact bolt 182 shown in FIGS. 5 and 6 is moved from the position shown in FIGS. At the same time, the striker 181 also moves toward the tip side of the first direction downward D1D of the cylinder 174 by its own weight so as to be connected to the impact bolt 182 . In other words, in the no-load driving state, the impact bolt 182 and the striker 181 hang downward in the first direction D1D due to their own weight.

In this case, since the striker 181 is positioned on the frontmost side in the cylinder 174, the air chamber 176 in the cylinder 174 is open to the outside through the ventilation hole 174A of the cylinder 174 shown in FIG. Despite being actuated, there will be no pressure fluctuations in air chamber 176 and striker 181 will not be actuated. For the sake of convenience, FIG. 6 conversely shows a configuration in which the air chamber 176 is not opened to the outside through the ventilation hole 174A (to be described later) in a load driving state.

In this case, as described above, the controller 260 rotates the motor 210 at the predetermined first speed R1. The drive speed of the vibration mechanism 177 is also in a relatively low speed range, and useless vibration generated in the impact tool 100 via the vibration damping mechanism 177 is minimized.
In this embodiment, this state is defined as a "soft no-load start" in which the motor 210 is driven at the first speed R1, which is relatively low in the no-load driving state.
The soft no-load start is an operation mode in which the motor 210 is rotated at a low speed in a state in which the vibration generated by the damping mechanism 177 is minimized to improve the response characteristics to the subsequent normal impact work.

In this embodiment, R1 is a predetermined value in a relatively low speed range, but it is also possible to set R1 to zero. In other words, it is also possible to select a setting in which the motor 210 is not rotationally driven in the no-load driving state. In this case, instead of the rising characteristics from the no-load driving state to the driving state, the setting emphasizes the energy saving effect and vibration suppression in the no-load driving state.

When the impact tool 100 is placed in a no-load drive, the following attributes are noted.
(1) The first elastic body 161 shown in FIG. 7 is placed in a non-compressed state, that is, in a state where no biasing force is applied. A clearance 190CL (2 mm in this embodiment) is secured between the bifurcated member 192 of the first slide guide member 190 and the pressing seat 120C.
(2) The second elastic body 162 shown in FIG. 7 is placed in an uncompressed state, that is, in a state where no biasing force is applied.
(3) In the detection mechanism 290 shown in FIG. 19, a clearance 290CL (1 mm in this embodiment) is secured between the movable member 292 and the duct cover 220 .

(Operation Mode 2 of Impact Tool 100: Switching from No-Load Drive State to Load Drive State)
When the operator presses the handle 130 downward in the first direction D1D, the second housing 120 integrated with the handle 130 moves downward in the first direction D1D. Adjacent to first housing 110 . Then, the controller case 270, which is a constituent member of the second housing 120, also moves downward in the first direction D1D, so that the second elastic body 162 is compressed via the second elastic body mounting portion 278 shown in FIG. be done. The second elastic body 162 placed in the compressed state exerts a biasing force on both the first housing 110 and the second housing 120 .

On the other hand, the first elastic body 161 has a clearance 190CL (2 mm) shown in FIG. 1 The elastic body 161 is placed in an uncompressed state, that is, in a state where no biasing force is applied. In other words, the clearance 190CL defines the "initial movement distance" for the first elastic body 161 to be placed in the state where the biasing force is not applied and only the second elastic body 162 to apply the biasing force.

On the other hand, in the detection mechanism 290 shown in FIG. 19, when the second housing 120 moves downward in the first direction D1D, the detection mechanism 290 as a whole moves to the first position by the clearance 290CL (1 mm) with respect to the duct cover 220. The lower end of the movable member 292 comes into contact with the duct cover 220 by moving downward in the direction D1D.
Further, when the second housing 120 moves downward in the first direction D1D, the movable member 292 is pushed by the duct cover 220 (which tries to approach relatively), and the biasing force of the movable member biasing elastic body 293 is applied. While resisting, it moves upward in the first direction D1U.
Magnetic detection by the sensor 294 is canceled by the movable member 292 moving upward in the first direction D1U. Based on this, the controller 260 detects pressing of the second housing 120 against the first housing 110 through the detection mechanism 290, thereby switching from the no-load drive state to the load drive state.

(Definition of load driving state of impact tool 100)
In this embodiment, a state in which the motor 210 is driven and the second housing 120 is pressed against the first housing 110 is defined as a "load driving state."
This "load driving state" is
(1) A state in which a load other than the weight of the impact tool 100 acts on the tip tool, i.e., a state in which the tip tool is pressed against the machining target and driven while a "load" (other than its own weight) acts. can be,
(2) Also defined as a state in which both the first elastic body 161 and the second elastic body 162 are compressed, or a state in which at least the second elastic body 162 is compressed and pressure is detected by the detection mechanism 290. It is possible.
The load driving state is also called "load driving state".

In the load driving state, the controller 260 rotationally drives the motor 210 at a predetermined second speed (second rotation speed) R2 set to a higher speed range than the first speed R1. The second speed R2 is also defined as the normal drive speed of the percussion operation.
That is, in this embodiment, based on detection by the detection mechanism 290, the rotation speed of the motor 210 increases (or the stationary state is switched to the normal rotation state), and the no-load drive state is switched to the load drive state. be.
In other words, the detection by the detection mechanism 290 cancels (cancels) the above-described soft no load, and the drive pattern is switched to the normal drive pattern.
A specific set value of the second speed R2 is set by comprehensively judging parameters such as the required output and power consumption in the normal drive operation (load drive state) of the impact tool 100, which is a large hammer. do.
The switching from the first speed R1 to the second speed R2 can be performed immediately, in a mode in which the switching time is set to a certain extent and gradually increased, in a mode in which the speed is increased in multiple stages, or a combination thereof. can be set as appropriate.
In this embodiment, a mode is adopted in which the first speed R1 is immediately switched to the second speed R2 based on the detection of pressure.

(Mode of Operation of Motion Conversion Mechanism 170 and Hitting Mechanism 180 in Load Driving State)
When the motor 210 is rotationally driven at the second speed R2 in the load driving state, the operation mode of the motion converting mechanism 170 is such that the motor 210 rotates at the first speed R1 at the low speed in the no-load driving state, except for the different speeds. It is substantially equivalent to the case of being driven. That is, as shown in FIGS. 5 and 6, the rotational output of the output shaft 213 of the motor 210 around the third direction D3 is transmitted to the first intermediate shaft 171 and the second intermediate shaft 172, and the crank mechanism 173 rotates the first intermediate shaft 171 and the second intermediate shaft 172. This is translated into linear motion in direction D1, which causes piston 175 to move linearly within cylinder 174 in a first direction D1. Similarly, the damping mechanism 177 mainly including the counterweight 178 performs linear motion in the first direction D1 on the outer circumference of the cylinder 174 .

When impact tool 100 is placed in a load driven condition, vent hole 174A is placed in the condition shown in FIG. Confidentiality is maintained.
Therefore, in the load driven state, pressure fluctuations in the air chamber 176 caused by the linear motion of the piston 175 within the cylinder 174 linearly move the striker 181 in the striking mechanism 180 to drive the impact bolt 182 . This causes the tip tool (not shown) to perform the striking operation. The working mode is defined as hammer mode.

In this case, as described above, the controller 260 rotates the motor 210 at the predetermined second speed R2. It is possible to carry out effective striking work.
Further, since the vibration damping mechanism 177 is also driven at a high speed corresponding to the second speed R2, which is higher than the first speed R1, the vibration damping effect is effective against relatively large vibrations generated on the first housing 110 side in the load driving state. will remain high. In other words, since the vibration can be suppressed firmly according to the impact work, a good working environment is provided.

(Action of anti-vibration handle)
In the load driving state, the worker grips the handle 130 and presses it downward in the first direction D1D to perform the impact operation. A situation is assumed in which vibration occurs on the housing 110 side.
In this case, relative movement occurs between the first housing 110 and the second housing 120 due to the vibration, and the first elastic body 161 shown in FIG. By applying force, transmission of the vibration from the first housing 110 side to the second housing 120 side is suppressed as much as possible. As described above, the second housing 120 includes the handle 130 gripped by the operator, the controller 260 that drives and controls the motor 210, various functional members 280 arranged in the controller case 270, the battery mounting portion 123, and the battery mounting portion 123. A battery 150 attached to the portion 123 is arranged integrally. By suppressing the vibration transmission from the first housing 110 to the second housing 120, the burden on the operator is reduced, and the controller 260, the functional member 280, and the battery mounting portion 123, which are precision equipment, are thoroughly protected.

In this embodiment, the movable stroke of the first elastic body 161 is set to 10 mm (10 millimeters). If a strong vibration that uses the entire movable stroke is input, the buffer member 205 and the stopper 204 described above act to suppress adverse effects such as bottom contact between the first housing 110 and the second housing 120 ( See Figure 7).

If the anti-vibration function is working in the load driving state, to be exact,
(1) urging the first elastic body 161 to act,
(2) The second elastic body 162, which is compressed by the operator's pressure, also exerts an urging force,
(3) Movable member biasing elastic body 293 compressed by operator's pressure
(See FIG. 20, etc.) also exerts a biasing force,
These biasing forces (1), (2), and (3) act between the first housing 110 and the second housing 120, respectively.
However, as described above, the elastic constant of the second elastic body 162 is set relatively small, and the elastic constant of the movable member urging elastic body 293 is set so that the movable member 292 returns to the initial position (see FIG. 19). is set to a minimum value to the extent that it is sufficient to give an urging force of . Therefore, the first elastic body 161 capable of exerting a strong elastic force plays a major role in the anti-vibration function in this embodiment.

For example, when a single elastic body is used to detect pressure for switching from the no-load drive state to the load drive state and to provide vibration isolation between the first housing 110 and the second housing 120, the elastic If the constant is increased, it is effective for vibration isolation, but the required pressing force setting of the operator becomes too high. Conversely, if the elastic constant is reduced, the required pressing force setting for the operator can be optimized, but the vibration isolation effect is reduced.
In this embodiment, an elastic body for "initial action" (ie, the second elastic body 162) for releasing the soft no load and an elastic body for vibration isolation (ie, the first elastic body 161) are separately provided, These problems do not arise because they are optimized for each application.

(Action of first sliding guide member 190 and second sliding guide member 200)
In the impact tool 100 according to this embodiment,
(1) As shown in FIG. 7, relative movement between the first housing 110 and the second housing 120 is controlled at a plurality of locations in the first direction D1 using the first sliding guide member 190 and the second sliding guide member 200. Stable operation is ensured by sliding guide at .
(2) As shown in FIG. 7, the first elastic body 161 that plays the main role of the anti-vibration mechanism is positioned between the first sliding guide member 190 and the second sliding guide member 200 in the first direction D1. By arranging them, a stable anti-vibration action is exhibited.
(3) As shown in FIGS. 8 and 9, by arranging a plurality of first sliding guide members 190 and second sliding guide members 200 around the first direction D1, a more stable operation is ensured. be done.
(4) For each component of the first sliding guide member 190 and the second sliding guide member 200, while using a metal pipe-shaped member 191 and a sheet metal sliding guide 203 with excellent rigidity, By using a resin material for the members (the bifurcated member 192, etc.) on the side that forms a pair with the members, both strength and weight reduction are achieved.
(5) The first sliding guide member 190 and the second sliding guide member 200 not only provide sliding guidance, but also the stopper 204 defines the maximum movable distance of relative movement, and furthermore, the maximum movable distance A rational vibration isolation structure is constructed by continuously buffering the relative movement operation by the buffer member 205 from the state in which the relative movement is less than the predetermined distance to the maximum movable distance.
Note that the stopper 204 and the buffer member 205 may be arranged in at least one of the first sliding guide 190 and the second sliding guide 200, separately from the first sliding guide 190 and the second sliding guide 200 (independently). ) are possible.

(Characteristics related to battery mountability, etc.)
As described above, in the impact tool 100 according to the present embodiment, as shown in FIGS. It is arranged to extend in the third direction D3. Then, the large dimension portion of the motor 210 is allocated along the third direction D3, and instead, the space formed for arranging other functional members along the second direction D2, which is the width direction of the impact tool 100, is used as an expansion space. Largely secured as S. That is, as shown in FIGS. 1 and 4, a relatively large space for other functional members is secured in the side area 114 of the first housing 110 in the second direction D2.
In this embodiment, this allows the battery 150, which is relatively heavy, to be as close as possible to the center of gravity of the impact tool 100 (located at the central axis along the first direction D1) in the second direction D2. As a result, generation of unnecessary force couple in the impact tool 100 can be greatly suppressed.

In addition, since the battery mounting direction 156 is set along the third direction D3 (see FIG. 3), when mounting the battery 150 to the battery mounting portion 123, the expansion space S can be used to create a large space. workability is improved because the mounting work can be performed with
Further, by setting the battery mounting direction 156 along the third direction D3, the battery mounting direction 156 can intersect the first direction D1 in which vibrations are likely to occur during impact work. It is possible to prevent problems such as unexpected separation due to the action of an external force.

Furthermore, as shown in FIG. 1 and the like, by setting the pair of battery mounting portions 123 in the regions 130A directly below the handle 130, the operator can hold the handle 130 with one hand and use the other hand to carry out the operation. The battery 150 on the opposite side is attached to the handle 130, then the grip of the handle 130 is exchanged, and the battery 150 on the opposite side is attached while the handle 130 is gripped by the other hand. The linkage between gripping and mounting of the battery 150 is improved.

(Characteristics relating to detection certainty and the like in the detection mechanism 290)
In this embodiment, as shown in FIGS. 10 to 13, 18 to 20, etc., the detection mechanism mounting portion is attached to the controller case 270, which is a constituent member of the second housing 120, as an assembly for the detection mechanism 290. 274, an integrally attached configuration is adopted.
The detection mechanism 290 is a member for detecting relative movement between the first housing 110 and the second housing 120 . Therefore, in general, it is common to distribute the components to both the first housing 110 and the second housing 120, but in this embodiment, they are distributed to the second housing 120 and , the duct cover 220 , which is an existing component of the first housing 110 , functions as a working medium for the movable member 292 .

Therefore, since each member of the detection mechanism 290 can be integrally arranged on the first housing 110 side as an assembly body, it is possible to suppress the risk of malfunction due to assembly error of each member, and eventually detection uncertainty. is.
Further, as shown in FIGS. 19 and 20, by forming a clearance 290CL between the movable member 292 and the duct cover 220, which is the working medium of the movable member 292, assembly errors, etc., between the first housing 110 and the second housing 120 can be eliminated. can also be absorbed, and the risk of malfunction and detection uncertainty can be suppressed.

Further, as described above, the detection mechanism 290 constitutes a mechanism for canceling the soft no load and switching to the load drive state. Due to accidental circumstances such as changing the orientation (angle of inclination with respect to the first direction D1), the pressing force may temporarily decrease.
In such a case, it is rather inconvenient to switch from the load drive state to the soft no-load state each time because of the decrease in the pressing force. Even if there is, it is set so that the load driving state is maintained without switching to soft no load until a certain period of time (for example, 1 second) elapses. This further improves the convenience during impact work.

Furthermore, it is generally conceivable to detect pressure based on, for example, a change in the load current of the motor, cancel the soft no load, and switch to the load driving state. In this case, there is a concern that the load current may vary depending on the material and type of the object to be struck, and the pressing force may not be detected accurately. In the present embodiment, since the mechanical detection mechanism of the movable member 292 urged by the movable member urging elastic body 293 is used to detect the pressure, the reliability of the detection is ensured.

(Characteristics of Controller Case 270)
In the impact tool 100 according to this embodiment, a controller 260 for motor drive control is held in a controller case 270 as shown in FIGS. 7, 10, 11, and the like.
The controller case 270 according to this embodiment has, for example, the following characteristics.
(1) As a configuration that holds not only the controller 260 but also various functional members 280 together, the configuration and assembly of the device are streamlined and facilitated, contributing to a compact overall configuration.
(2) The frame 271 is the main body and has a lightweight and highly rigid structure.
(3) By being placed in the second housing 120 on the vibration-isolating side, a seismic isolation structure against vibrations generated in the first housing 110 is achieved.
(4) By arranging it in the area directly above the motor 210, it is easy to route the wire harness (wiring) for the motor 210.
(5) The wire harness ( wiring) can be arranged, and simplification of design and assembly can be achieved.
(6) As described above, in this embodiment, the motor 210 is a brushless motor that can be easily downsized while maintaining a large output. However, by arranging the controller case 270 in the area directly above the motor 210, the expansion space S can be easily used for arranging wire harnesses, etc., and the internal space can be utilized with high efficiency. be.

(Characteristics related to cooling performance of motors, controllers, etc.)
In the impact tool 100 according to the present embodiment, as described above, as a route for supplying the cooling air to the member to be cooled, "intake from the cooling air inlet 127" through the axial flow action of the cooling fan 214 of the motor 210. “flow inside the head case 121”-“cool the controller 260”-“first end 232 of the duct hose 231”-“inside the duct hose 231”-“second end 233 of the duct hose 231”-“duct The controller 260 and the motor 210 are cooled in this order via the "cover 220" - "the inside of the motor housing 215".
Furthermore, the cooling air that has cooled the motor 210 passes through the “upper drive mechanism housing portion 111” and “lower drive mechanism housing portion 112” in the first housing 110, and passes through the motion converting mechanism 170 and the striking mechanism 180 (one of them). part) is cooled and discharged to the outside of the impact tool 100 . For the sake of convenience, detailed illustration of the cooling air passages downstream of the motor 210 is omitted.

Furthermore, in the impact tool 100 according to the present embodiment, the following points can be cited as characteristics relating to the coolability of the constituent elements, for example.
(1) When the duct hose 231 is stretched from a predetermined initial state, it is stretched by a predetermined amount from the initial state using a member that exerts an urging force toward the contraction side so that it returns to the initial state. It is arranged between the first housing 110 and the second housing 120 in a connected state. As a result, the duct hose 231 is placed in a state in which an urging force is always applied to the contraction side so as to return to the initial state. Therefore, even when the first housing 110 and the second housing 120 move relative to each other, the duct hose 231 does not become loose and contact other members and wear out, and excessive tension and twisting are unlikely to occur. , the cooling air can be effectively transferred between members that move relative to each other.

(2) As shown in FIGS. 11, 16, and 17, the cross sections of the first end 232 and the second end 233 intersect each other. As a result, similar to (1) above, when the first housing 110 and the second housing 120 move relative to each other, twisting of the duct hose 231 and unnecessary application of tension can be easily avoided.

(3) As shown in FIG. 16, the first end 232 and the second end 233 of the duct hose 231 are directly connected to the duct member mounting portion 272 of the controller case 270 and the duct member mounting portion 225 of the duct cover, respectively. Mounted in a mating manner. That is, by adopting the adapter-free structure, the device configuration can be simplified.

(4) As shown in FIG. 16, since the first end 232 of the duct hose 231 is located in the upper area close to the cooling fan 214 of the motor 210, the duct hose 231 should not be unnecessarily long and should not be too short. It becomes easy to avoid the problem that unnecessary tension is applied.

(5) As shown in FIG. 16, at least the cooling air intake port 127A is provided corresponding to the end of the controller case 270 opposite the duct member mounting portion 272 . Furthermore, in this embodiment, a cooling air intake port 127 is provided over the entire upper surface of the head case 121 . As a result, the cooling air sucked into the impact tool 100 can cool the entire controller 260, thereby improving the cooling efficiency.

(6) As shown in FIG. 11, the duct hose 231 is placed in a state in which the duct section guide rib 116 of the motor housing 215 holds the curved shape of the central portion. As a result, even when the first housing 110 and the second housing 120 move relative to each other, the mounting shape of the duct hose 231 (roughly L-shaped) is maintained, and twisting of the duct hose 231 and unnecessary tension application are prevented. Easier to avoid.

(Example of modification of handle 130)
In the impact tool 100 according to this embodiment, as shown in FIG. configuration can be changed.
As shown in FIGS. 21 and 22, the impact tool 300 according to the modification includes a first housing 310 and a vibration-proof second housing connected to the first housing 310 so as to be relatively movable in the first direction D1. 320. The second housing 320 is provided with a first handle portion 331 and a second handle portion 341 as the handle 330 extending in the second direction D2.

The first handle portion 331 and the second handle portion 341 are handle gripping portions 333 and 343 to be gripped by an operator, and both ends of the handle gripping portions 333 and 343 are connected to the second housing 320, respectively. It has bases 332 , 342 .
The first handle portion 331 and the second handle portion 341 are each formed in a loop shape (annular shape) when viewed in the first direction D1, and are separated from the second housing 320 in the second direction D2 and the second handle portion 341, respectively. It has closed spaces 334 and 344 with respect to the third direction D3.
Battery mounting portions 323 are provided on both side surfaces of the second housing 320 at height positions facing the spaces 334 and 344 in the first direction D1.

21 and 22 show a state in which a battery 350 is attached to each of the battery attachment portions 323. FIG.
In this state, each battery 350 is arranged so as to be surrounded by the spaces 334 and 344 with respect to the plane formed by the second direction D2 and the third direction D3. are members to be gripped by an operator, and are configured to play a role as a battery protector that protects the battery 350 from external force.
Note that the impact tool 300 according to the modified example is also provided with an LED light 329, and is configured to contribute to facilitating visibility during impact work.

Further, as shown in FIG. 21, also in this modification, the output shaft 361 of the motor 360 is arranged to extend along the third direction D3.
Therefore, by orienting the large-sized output shaft 361 in the third direction D3, a relatively large expansion space S can be formed in the second direction D2.
In this modified example as well, the battery 350 can be mounted on the battery mounting portion 323 using this expansion space S, so the rationality of the arrangement is improved.

As described above, according to the present embodiment and its modification, in the impact tool 100, which normally performs impact work in a state of facing downward due to its own weight, construction technology that contributes to the rationalization of the arrangement configuration and operability of the members. was to be provided.

100: impact tool
110: First housing (main body)
111: upper drive mechanism housing portion 112: lower drive mechanism housing portion 113: tip region 114: side region 115: motor housing 116: duct portion guide rib
120: Second housing (main body)
120A: First elastic body mounting seat 120B: Second elastic body mounting seat 120C: Pressing seat 121: Head case 122: Handle mounting portion 123: Battery mounting portion 124: Slide guide 125: Power supply terminal 126: Buffer member contact seat 127 : Cooling air inlet 128: Battery protector 129; LED light
130: Handle
131: First handle part (handle R)
132: First Handle Base 133: First Handle Grip 134: Free End Region 135: Trigger 136: Electrical Switch
141; second handle (handle L)
142: Second handle base portion 143: Second handle grip portion 144: Free end region 130A: Region directly below the handle
330: Handle (according to the modified example)
310: first housing 320: second housing 323: battery mounting portion 329: LED light 331: first handle portion 332: handle base portion 333: handle grip portion 334: (closed) space portion 341; second handle portion 342: Handle Base Part 343: Handle Grip Part 344: (Closed) Space Part 350: Battery 360: Motor 361: Output Shaft
150: Battery
151: Battery Front Part 152: Battery Top Part 153: Battery Bottom Part 154: Battery Rear Part 155: Lock Release Part 156: Battery Mounting Direction
161: First elastic body
162: Second elastic body
170: Motion conversion mechanism
171: First intermediate shaft 172: Second intermediate shaft 173: Crank mechanism 174: Cylinder 174A: Air vent 175: Piston 176: Air chamber 177: Damping mechanism 178: Counterweight
180: striking mechanism
181: striker 182: impact bolt
190: First sliding guide member (handle proximity side sliding guide member)
191: Pipe-shaped member (first housing side component)
192: Bifurcated member (second housing side component)
190CL: Clearance
200: Second sliding guide member (handle separation side sliding guide member)
201: Convex member 202: Concave member 203: Sheet metal slide guide 204: Stopper 205: Buffer member
210: motor
211: Stator 212: Rotor 213: Output shaft 214: Cooling fan 215: Motor housing
220: Duct cover
221: Internal space 222: Motor mounting seat 223: Flange 224: Cooling air guide path 225: Duct member mounting portion
230: Duct member
231: Duct hose 232: First end 233: Second end
240: Tool holder
250: retainer
260: controller
261: Radiation fin
270: Controller case
271: Frame 272: Duct member attachment portion 273: Head case attachment portion 274: Detection mechanism attachment portion 275: Main power switch attachment portion 276: Communication unit attachment portion 277: Wire harness insertion opening 278: Second elastic body attachment portion
280: Functional member
281: Main power switch 282: Communication unit
290: Detection mechanism
291: Assembly body base 292: Movable member 293: Movable member biasing elastic body 294: Sensor 290CL: Clearance
D1: first direction (long axis direction)
D1D: First direction downward D1U: First direction upward D2: Second direction (width direction)
D3: third direction (thickness direction)
AX: Long axis HL: Virtual line MS: Initial movement distance S: Expansion space

Claims (11)

When defining an elongated main body portion having a tool holder in a tip region, and defining a longitudinal direction of the main body portion as a first direction and defining a width direction intersecting with the first direction as a second direction, and a pair of handles extending in the second direction, and detachably attached to the tool holder in a state in which an operator holds the pair of handles with left and right hands and hangs down by its own weight. An impact tool that performs an impact operation via a tip tool,
a drive mechanism for driving the tip tool in the first direction;
a motor provided with a motor output shaft for driving the drive mechanism,
The motor output shaft is provided so as to extend in a third direction defined as a thickness direction that intersects both the first direction and the second direction, and extends laterally of the main body in the second direction. A battery mounting part is provided in the region,
The impact tool, wherein a battery for supplying power to the motor is attached to the battery attachment portion. 2. The impact tool according to claim 1, wherein the battery mounting portions are arranged in pairs on both side surfaces of the main body portion in the second direction. 3. The impact tool according to claim 1, wherein in a state in which a battery is attached to said battery attachment portion, an outer shell of said battery covers a free end region of said handle and said tip end region of said main body. An impact tool, characterized in that it is configured to be arranged within a connecting imaginary line. 4. The impact tool according to any one of claims 1 to 3, wherein each of said handles has a gripping portion extending linearly to be gripped by an operator. tool. 5. The impact tool according to any one of claims 1 to 4, wherein the first direction is downward from the handle toward the tool holder and upward from the tool holder toward the handle. , the battery mounting portion is provided in a region immediately below the lower side of the handle in the first direction. 6. The impact tool according to any one of claims 1 to 5, wherein the battery mounting portion is configured so that a battery can be slidably mounted in a manner crossing the first direction. tool. 7. The impact tool according to any one of claims 1 to 6, wherein said drive mechanism has a motion conversion mechanism for converting rotary motion of said motor output shaft into linear motion in said first direction. 1. A percussion tool, wherein said battery mounting portion is provided in an overlapping manner with said motion converting mechanism in relation to said first direction. 8. The impact tool according to claim 7, wherein the motion conversion mechanism is arranged on the side of the main body part away from the operator in the third direction. 9. The impact tool according to any one of claims 1 to 8, wherein said main body has a battery protector for protecting an outer shell of a battery mounted in said battery mounting area. impact tool. 4. The impact tool according to any one of claims 1 to 3, wherein said pair of handles are formed in an annular shape when viewed from said first direction. An impact tool according to claim 10, comprising:
The impact tool, wherein the battery mounting portion is provided within the annular portions of the pair of handles when viewed in the first direction.

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