CN208285834U - Grass trimmer - Google Patents

Abstract

The utility model provides a kind of grass trimmer, including shell, the damper being fixed on the shell, the tool section set on the damper end, the motor that is fixedly connected with the damper and the pcb board being set to above the damper.The grass trimmer further includes the heat-conducting metal shell being fixed on the damper.The pcb board is fixedly installed on the heat-conducting metal shell.It is arranged such, the heat that pcb board in the grass trimmer course of work generates can be radiated in other mechanisms of grass trimmer by heat-conducting metal shell, and then heat is evacuated, to achieve the purpose that heat dissipation, to improve the cooling performance of grass trimmer, the job stability of grass trimmer is improved.

Description

Grass trimmer

Technical field

The utility model relates to garden instrument field more particularly to a kind of grass trimmers.

Background technique

Currently, hand-held electric tool is more and more in the market, especially garden instrument industry.Such as: snowplough pushes away grass Machine etc..Electric control element can generate a large amount of heat to these electronic tools at work, these heats need evacuation in time, to protect Shield electric control element is unlikely to overheat and damage.Thus, machine performance of the performance of cooling system and cooling system to electric tool It is most important.

Currently, what is generallyd use in the market is that blowing cooling carries out cooling to machine.Blowing cooling The disadvantage is that needing in addition to add blower mechanism, the complexity of machine is increased, improves the cost of machine.

In view of this, it is necessary to a kind of improved grass trimmer is designed, to solve the above problems.

Utility model content

The purpose of this utility model is to provide a kind of cooling grass trimmers of good performance.

To realize above-mentioned purpose of utility model, the utility model provides a kind of grass trimmer, including shell, be fixed on it is described It damper on shell, the tool section set on the damper end, the motor that is fixedly connected with the damper and is set to Pcb board above the damper, the grass trimmer further include the heat-conducting metal shell being fixed on the damper, the PCB Plate is fixedly installed on the heat-conducting metal shell.

The heat-conducting metal shell includes frame and the receipts that are surrounded by the frame as a further improvement of the utility model, Hold space, the pcb board is contained in the accommodating space.

The pcb board and the motor are arranged side by side as a further improvement of the utility model, and the grass trimmer also wraps The housing for being located at the motor periphery is included, uptake and lower air port are provided on the housing, the lower air port is described in Pcb board setting.

The short transverse setting along the grass trimmer is formed in the housing as a further improvement of the utility model, Upper air duct and lower air duct, the lower air duct and the upper air duct be interconnected, and the lower air port is set on the lower air duct, The uptake is set on the upper air duct.

The uptake is respectively facing different directions from the lower air port and sets as a further improvement of the utility model, It sets.

The heat-conducting metal shell is thermally conductive aluminum hull as a further improvement of the utility model,.

Tool section output shaft, the tool section setting are provided on the damper as a further improvement of the utility model, On the tool section output shaft.

The damper includes the gear with several gears, institute as a further improvement of the utility model, The quantity for stating gear is even number, and the tool section output shaft is set on outermost two gears, and two tool sections The rotation direction of two tool sections on output shaft is opposite.

The motor has power output shaft, the power output shaft and institute as a further improvement of the utility model, Any one of gear stated in gear is connected.

Two tool sections are respectively the first tool section and the second tool section as a further improvement of the utility model, described There are angle [alpha]s between first tool section and second tool section, and the range of the angle [alpha] is 0 °~90 °.

The beneficial effects of the utility model are: the grass trimmer of the utility model is by being fixed on heat-conducting metal shell for pcb board On, heat-conducting metal shell is fixed on damper, and the heat so as to generate pcb board in the grass trimmer course of work passes through thermally conductive Aluminum hull is radiated in other mechanisms of grass trimmer, and then heat is evacuated, to achieve the purpose that heat dissipation, to improve grass trimmer Cooling performance, improve the job stability of grass trimmer.

Detailed description of the invention

Fig. 1 is the stereogram exploded view of the utility model grass trimmer.

Fig. 2 is the diagrammatic cross-section of the utility model grass trimmer.

Fig. 3 is the structural schematic diagram of the utility model damper and tool section.

Fig. 4 is the structural schematic diagram of damper in Fig. 1.

Fig. 5 is the positional diagram of the first tool section and the second tool section in Fig. 1.

Specific embodiment

In order to keep the purpose of this utility model, technical solution and advantage clearer, with reference to the accompanying drawing and it is embodied The utility model is described in detail in example.

It please refers to shown in Fig. 1 to Fig. 5, a kind of grass trimmer 100, including shell 1, the damper being fixed on the shell 1 2, the motor 3 that is fixedly connected with the damper 2, is fixedly installed on institute at the heat-conducting metal shell 4 being fixed on the damper 2 It states the pcb board 5 on heat-conducting metal shell 4 and is set to 1 top of shell and combines connection with the shell 1 and form receiving sky Between big housing 7.The damper 2 is respectively positioned on the shell 1 with the motor 3 and combines the receiving formed with the big housing 7 In space.The opening 71,72,73 corresponding to battery cavities (not shown) and the motor 3 is offered on the big housing 7, it is described 71,72,73 coverd part (not shown) of opening are covered to prevent rainwater from entering the big housing 7.The heat-conducting metal shell 4 includes side Frame 41 and the accommodating space 42 surrounded by the frame 41, the pcb board 5 are contained in the accommodating space 42.It is described thermally conductive The heating conduction of metal-back 4 is good, it is preferred that the heat-conducting metal shell 4 uses aluminum alloy material；The shell of the damper 2 (not labeled) and the shell 1 are also metal material, and heating conduction is good, and the damper 2 and the 1 phase mutual connection of shell Touching is conducive to heat conduction.So set, a part of heat that the pcb board 5 generates in 100 course of work of grass trimmer Amount is radiated to the damper 2 by the pcb board 5, and then is radiated to the shell 1, and the surface area of the shell 1 is big, has Conducive to heat evacuation, to reach heat dissipation purpose, the normal work of the grass trimmer 100 ensure that.

The motor 3 is fixedly installed on 2 top of damper with the pcb board 5 side by side.The grass trimmer 100 also wraps Include the housing 6 for covering at 3 periphery of motor.The short transverse setting along the grass trimmer 100 is formed in the housing 6 Upper air duct 61 and lower air duct 62.It is interconnected between the lower air duct 62 and the upper air duct 61, is arranged on the lower air duct 62 There is opening towards the lower air port 621 of the pcb board 5, is provided with uptake 611 on the upper air duct 61.Preferably, the windward Mouth 611 is respectively facing different directions from the lower air port 621 and is arranged.So set, when the motor 3 work, the electricity The fan (not shown) rotation being arranged in machine 3, forms air-flow, the motor 3 can pass through the lower air port in the housing 6 621 carry out exhausting, and a part of heat that the pcb board 5 is generated sucks in the motor 3, then pass through the uptake The 611 discharge big housings 7, achieve the purpose that pcb board 5 described in cooling.Certainly, the housing 6 or integration Design, only needs to guarantee, the uptake 611 and the lower air port 621, and 621 court of lower air port is provided on the housing 6 It is arranged to the pcb board 5, to aspirate a part of heat of the pcb board 5 by the lower air port 621 in the motor 3 work Amount, reaches cooling purpose.

The damper 2 includes gear (not labeled), and the gear includes four gears 21, four institutes It states gear 21 to arrange in "-" type, a respectively driving wheel and three driven wheels, the driving wheel is in intermediate two gears Any one.The motor 3 has a power output shaft (not shown), the power output shaft with the driving wheel is concentric connects It connects, to drive the driving wheel to rotate.Tool section output is provided in four gears on two gears in outside Axis 22,23, the tool section output shaft 22,23 ends are separately installed with the first tool section 221 and the second tool section 231.First knife There are angle [alpha] between item 221 and second tool section 231, the range of the angle [alpha] is 0 °~90 °.Preferably, described first The angle [alpha] between tool section 221 and second tool section 231 is 90 °.So set, making two tool section output shafts 22,23 rotation direction is on the contrary, drive first tool section 221 opposite with the direction of rotation of second tool section 231, it is therefore prevented that It is interfered with each other in first tool section 221 and 231 rotary course of the second tool section.Particularly, the tool section output shaft 22 Direction of rotation is that counterclockwise, the direction of rotation of the tool section output shaft 23 is clockwise, that is, two tool sections are equal It is rotated inwardly from the outside of the grass trimmer 100 and carries out grass cutting action.So set, first tool section 221 and described the The grass of two tool sections 231 cutting is assembled to the middle position of the shell 1, convenient for passing through the interposition for being set to the shell 1 The careless cavity 11 that goes out set is discharged.It should be noted that the gear quantity is not limited to be four, the power output shaft can be with Any one of gear is connected, and need to only guarantee that the gear quantity is even number, so that two tool section output shafts 22,23 Rotation direction it is opposite.

In the present embodiment, between the shell 1 and the damper 2, between the damper 2 and the motor 3, It between the heat-conducting metal shell 4 and the pcb board 5 is fastenedly connected by screw.It should be noted that aforementioned corresponding two It can also not be limited herein using other general connection type connections between a mechanism.

The cooling principle of the pcb board 5 of the grass trimmer 100 is specifically described below: in the mowing In the course of work of machine 100, the pcb board 5 starts to generate heat, and heat a part that the pcb board 5 generates can be by described 4 downward radiation of heat-conducting metal shell is radiated always on the shell 1 by the damper 2.A part of heat passes through the shell Body 1 is to ambient radiation, and in the course of work of the grass trimmer 100, first tool section 221 and second tool section 231 In high speed rotation state, high-speed rotating first tool section 221 can be generated with second tool section 231 to be circulated Wind, wind can evacuate the irradiated heat to be gathered on the damper 2 and the shell 1 of the pcb board 5；Meanwhile in institute In the course of work for stating grass trimmer 100, the fan being installed in the motor 3 of 5 side of pcb board is also at high speed rotation State, the motor 3 can carry out exhausting by the lower air port 621, and another part heat that the pcb board 5 is generated sucks In the motor 3, it is discharged by the uptake 611, to achieve the purpose that pcb board 5 described in cooling, ensure that described Grass trimmer 100 works normally.So set, the motor 3 can be passed through when the grass trimmer 100 is in running order The cooling wind of the cooling wind that fan is formed, first tool section 221 inside the shell 1 and second tool section 231 formation And the heat loss through radiation of the shell 1 itself cools down the pcb board 5；When the grass trimmer 100 is temporarily in work Gap or be in halted state when, the pcb board 5 can be cooled down by the heat loss through radiation of the shell 1 itself. It realizes when the grass trimmer 100 work, heat-sinking capability is strong；When the grass trimmer 100 does not work, remain to continue heat dissipation, Improve the heat dissipation performance of the grass trimmer 100.

In conclusion the grass trimmer 100 of the utility model is by being fixed on the heat-conducting metal for the pcb board 5 On shell 4, the heat-conducting metal shell 4 is fixed on the damper 2, and the damper 2 contacts with each other with the shell 1, thus The heat that pcb board 5 described in 100 course of work of grass trimmer generates can be radiated to institute by the heat-conducting metal shell 4 Damper 2 is stated, and then is radiated to the shell 1, the surface area of the shell 1 is big, is conducive to heat evacuation, and then heat is dredged It dissipates, to achieve the purpose that heat dissipation, to improve the cooling performance of the grass trimmer 100, improves the grass trimmer 100 Job stability.

Above embodiments are merely intended for describing the technical solutions of the present application, but not for limiting the present application, although referring to preferred embodiment pair The utility model is described in detail, those skilled in the art should understand that, it can be to the technology of the utility model Scheme is modified or replaced equivalently, without departing from the spirit and scope of the technical scheme of the present invention.

Claims (10)

1. a kind of grass trimmer, including shell, the damper being fixed on the shell, set on the damper end tool section, The motor being fixedly connected with the damper and the pcb board being set to above the damper, it is characterised in that: the mowing Machine further includes the heat-conducting metal shell being fixed on the damper, and the pcb board is fixedly installed on the heat-conducting metal shell.

2. grass trimmer according to claim 1, it is characterised in that: the heat-conducting metal shell includes frame and by the frame The accommodating space surrounded, the pcb board are contained in the accommodating space.

3. grass trimmer according to claim 1, it is characterised in that: the pcb board and the motor are arranged side by side, described to cut Careless machine further includes the housing for being located at the motor periphery, and uptake and lower air port, the lower air port are provided on the housing It is arranged towards the pcb board.

4. grass trimmer according to claim 3, it is characterised in that: be formed with the height along the grass trimmer in the housing The upper air duct and lower air duct of direction setting, the lower air duct and the upper air duct are interconnected, and the lower air port is set to described On lower air duct, the uptake is set on the upper air duct.

5. grass trimmer according to claim 4, it is characterised in that: the uptake and the lower air port are respectively facing difference Direction setting.

6. grass trimmer according to claim 1, it is characterised in that: the heat-conducting metal shell is thermally conductive aluminum hull.

7. grass trimmer according to claim 1, it is characterised in that: tool section output shaft is provided on the damper, it is described Tool section is arranged on the tool section output shaft.

8. grass trimmer according to claim 7, it is characterised in that: the damper includes that there is the gear of several gears to pass The quantity of dynamic case, the gear is even number, and the tool section output shaft is set on outermost two gears, and two institutes The rotation direction for stating two tool sections on tool section output shaft is opposite.

9. grass trimmer according to claim 8, it is characterised in that: the motor has power output shaft, and the power is defeated Shaft is connected with any one of gear in the gear.

10. grass trimmer according to claim 8, it is characterised in that: two tool sections are respectively the first tool section and second Tool section, there are angle [alpha]s between first tool section and second tool section, and the range of the angle [alpha] is 0 °~90 °.