EP2379281B1 - Hand-held machine tool - Google Patents

Description

State of the art

The invention relates to a hand tool according to the preamble of claim 1.

In the DE 38 19 125 A1 is already a hand tool, in particular a hammer drill, with a work spindle, a power tool housing and a parallel to the work spindle intermediate shaft, which is axially displaceably mounted to a mode change, and with a toothed sleeve, which is intended to transmit a torque to the intermediate shaft , has been proposed.

In the DE 10 2006 029 363 A1 is a trained as a drill and / or percussion hammer electric tool with a work spindle, a striking mechanism and an electric drive motor, which is connectable via a gear and clutch means with a work spindle driving intermediate shaft and / or a percussion drive described.

A hand tool according to the preamble of claim 1 is made DE 42 16 808 A1 known.

Disclosure of the invention

The invention relates to a power tool according to claim 1, in particular a hammer drill, with a work spindle, a hand tool housing and an intermediate shaft arranged parallel to the work spindle, which is axially displaceably mounted to a mode change, and with a toothed sleeve, which is intended to a To transmit torque to the intermediate shaft.

It is proposed that the toothed sleeve is fixed in the axial direction by means of the handheld power tool housing. A "work spindle" is to be understood in particular also a hammer tube in which one to a Pulse generation provided element is performed. The work spindle is rotatable and can be axially fixed and / or at least partially axially movable and / or multi-piece be executed. A "change of operating mode" is to be understood in particular as switching between two operating modes, in particular between a percussion drilling operation, a drilling operation and / or a chisel operation. An "operating mode" should be understood in particular to be the bit operation, the percussion drilling operation and / or the drilling operation. In a chisel operation, a tool performs a movement along a main working direction. In a drilling operation, the tool rotates about an axis of rotation parallel to the main working direction. In a percussion drilling operation, the tool executes the two movements simultaneously. A "main working direction" is to be understood, in particular, as a direction in which the handheld power tool is normally moved during a working operation, for example directly during a drilling operation. "Provided" is to be understood in particular to be specially equipped and / or designed. A "toothed sleeve" should in particular be understood to mean an element which at least partially surrounds a cavity and / or at least one toothed element, which preferably consists of teeth and tooth spaces and is designed as a spur gear, has to transmit a torque. The term "transmit a torque" is to be understood in particular also a transmission of power by means of a rotary motion. By "fixed in the axial direction" should be understood immovable, in particular along an axis. In particular, the toothed sleeve remains immobile in a mode change in the axial direction with respect to a hand tool housing and / or with respect to a motor shaft. In this context, a "hand tool machine" is to be understood as meaning, in addition to a rotary hammer, in particular also a percussion drilling machine and / or another hand tool machine that appears appropriate to a person skilled in the art. Due to the inventive design of the power tool can be effectively minimized by means of the toothed sleeve fixed in the axial direction wear of the toothed sleeve and / or the motor shaft and tilting of the toothed sleeve and / or the motor shaft and / or the intermediate shaft are advantageously avoided when switching under load.

Furthermore, the power tool on a motor shaft, which is arranged parallel to the work spindle. Advantageously, the toothed sleeve is fixed relative to the motor shaft in the axial direction. By "arranged in parallel" is to be understood in this context in particular that rotational axes of the work spindle, the motor shaft and the intermediate shaft are aligned parallel to each other. Alternatively, the power tool may have a motor shaft which is arranged perpendicular to the work spindle. By arranged parallel to the work spindle motor shaft advantageous low height can be achieved.

Furthermore, a switching element is proposed which is axially displaceable for at least one operating mode change with respect to the toothed sleeve, whereby a reliable and rotationally fixed connection between the intermediate shaft and the switching element is advantageously possible in at least two operating modes, such as a drilling operation and a percussion drilling operation.

Furthermore, the hand tool on a coupling element which rotatably connects at least the switching element and the tooth sleeve together. A "coupling element" is to be understood in particular to mean a device which rotatably connects two elements, independent of any axial displacement of the elements towards or away from one another. Particularly advantageously, the coupling element is designed as a splined shaft profile. There are also other, the expert appear useful training that meet the same function, possible. By the coupling element, the switching element and the toothed sleeve are advantageously connected to each other with a rotationally fixed connection in all positions of the switching element and the intermediate shaft.

In addition, it is proposed that the toothed sleeve at least partially surrounds the switching element. By "at least partially enclose" is to be understood in particular that the switching element is at least partially disposed in the cavity which surrounds the toothed sleeve, whereby a required space can be advantageously reduced.

In a further embodiment, a spring element is proposed which is intended to displace at least the switching element at least during a mode change, whereby a simple construction is possible. In particular, the spring element shifts the switching element in a change from the drilling operation in the Schlagbohrbetrieb. Instead of a spring element configured as a helical spring, it is also possible to use another device that appears appropriate to a person skilled in the art, such as a rubber element, a hydraulic, magnetic or pneumatic device, used to move the switching element.

Furthermore, a spring element is proposed which surrounds the toothed sleeve at least partially, whereby very little space is required for a gear assembly.

Further, a connecting element is proposed which rotatably connects the intermediate shaft and the switching element in at least one mode of operation. A "connecting element" should in particular be understood to mean a device which, in at least one mode of operation, prevents a relative rotational movement of two elements relative to one another, in this case the intermediate shaft and the switching element. In particular, the connecting element in a drilling operation and in a percussion drilling operation prevents a relative rotational movement of the two elements relative to one another. In at least one other operating mode, in particular in a chiseling operation, the connecting element allows a freewheel, that is to say a rotational relative movement, in which the two elements are rotatable relative to one another. By the first connecting element, an advantageous rotational movement of the tool can be achieved during at least one operating mode.

In addition, it is proposed that the connecting element is opened in a chiseling operation. Advantageously, the connecting element, which rotatably connects the intermediate shaft and the switching element in at least one operating mode, is opened in a chiseling operation. By "open" is to be understood in this context, in particular, that the two elements that connects the connecting element, rotatably connected to each other in a drilling operation and a percussion drilling operation and now have a freewheel to each other. The opened connection element advantageously makes it possible to expand an application range of the handheld power tool.

Furthermore, a second connecting element is proposed, which transmits at least one torque from the switching element to a Huberzeuger in at least one mode, whereby an advantageous impact movement of the tool can be achieved. In this case, the Huberzeuger be realized for example by means of a wobble drive and / or an eccentric drive.

In a further embodiment, it is proposed that the second connecting element is opened in a drilling operation, whereby advantageously an application range of the portable power tool can be expanded.

Furthermore, an additional bearing element is proposed, by means of which at least the toothed sleeve is mounted. An "additional bearing element" is to be understood in particular as a bearing element that can be produced separately from elements that are adjacent in an installed state, in particular a housing element and / or the toothed sleeve. Advantageously, the additional bearing element is designed as a stud. The term "supported by the bearing element" should be understood in this context, in particular, that the bearing element derived at least during storage linear forces occurring and / or supported. In this case, a bearing allows differently oriented movements, in this case, a different axial rotational movement of the toothed sleeve and the bearing element. Various bearings that appear appropriate to the person skilled in the art, such as sliding bearings, roller bearings, sheet metal cups, needle roller bearings and / or deep groove ball bearings, can be used. By means of the additional bearing element, the toothed sleeve can be mounted structurally simple.

In addition, it is proposed that the additional bearing element is at least rotatably connected to a housing element, whereby the hand tool can be easily mounted.

In a further embodiment, an integrally formed with a housing element bearing pin is proposed, by means of which at least the toothed sleeve is mounted. By "integral" is to be understood in this context, in particular, that the bearing pin and the housing element are made of a common blank. As a result, components can be advantageously saved.

Furthermore, a bearing is proposed which supports at least the toothed sleeve in a Huberzeuger. By the term "stored in a Huberzeuger" should be understood in particular that occurring during storage forces on at least one component of the Huberzeugers, preferably a transmission element of the Huberzeugers, derived and / or supported. In particular, the bearing element should support the toothed sleeve in the elevator, to which the second connecting element transmits a torque. The storage of the toothed sleeve in the Huberzeuger can be saved particularly advantageous space.

Furthermore, at least one bearing arranged inside the toothed sleeve which axially and / or radially supports the toothed sleeve is proposed. By "within the toothed sleeve" is to be understood in particular that the toothed sleeve encloses the bearing at least partially. By the bearing inside the toothed sleeve additional space can be saved.

In a further embodiment, it is proposed that the toothed sleeve has a bearing journal. Advantageously, the bearing journal is rotatably connected to the toothed sleeve. By the journal of the toothed sleeve bearing can be advantageously arranged within the hand tool housing.

drawing

Further advantages emerge from the following description of the drawing. In the drawings, nine embodiments of the invention are shown, wherein three embodiments relate in particular to a device for transmitting torque and six embodiments of a bearing of a toothed sleeve. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations. In particular, the embodiments one to three can be combined with the exemplary embodiments four to nine.

Fig. 1

eine schematische Darstellung einer als Bohrhammer ausgebildeten Handwerkzeugmaschine,

Fig. 2

eine schematische Innenansicht der Handwerkzeugmaschine aus Figur 1 in einem ersten Ausführungsbeispiel,

Fig. 3

eine schematische Innenansicht der Handwerkzeugmaschine in einem zweiten Ausführungsbeispiel,

Fig. 4

eine schematische Innenansicht der Handwerkzeugmaschine in einem dritten Ausführungsbeispiel,

Fig. 5

eine schematische Detailansicht einer Getriebeanordnung der Handwerkzeugmaschine des ersten Ausführungsbeispiels,

Fig. 6

eine schematische Detailansicht der Getriebeanordnung in einem vierten Ausführungsbeispiel,

Fig. 7

eine schematische Detailansicht der Getriebeanordnung in einem fünften Ausführungsbeispiel,

Fig. 8

eine schematische Detailansicht der Getriebeanordnung in einem sechsten Ausführungsbeispiel,

Fig. 9

eine schematische Detailansicht der Getriebeanordnung in einem siebten Ausführungsbeispiel und

Fig. 10

eine schematische Detailansicht der Getriebeanordnung in einem achten Ausführungsbeispiel.

Show it:

Fig. 1

a schematic representation of a trained as a hammer drill hand tool,

Fig. 2

a schematic interior view of the power tool from FIG. 1 in a first embodiment,

Fig. 3

a schematic interior view of the power tool in a second embodiment,

Fig. 4

a schematic interior view of the power tool in a third embodiment,

Fig. 5

a schematic detail view of a gear arrangement of the power tool of the first embodiment,

Fig. 6

a schematic detail view of the transmission arrangement in a fourth embodiment,

Fig. 7

a schematic detail view of the transmission arrangement in a fifth embodiment,

Fig. 8

a schematic detail view of the gear arrangement in a sixth embodiment,

Fig. 9

a schematic detail view of the transmission arrangement in a seventh embodiment and

Fig. 10

a schematic detail view of the gear assembly in an eighth embodiment.

Description of the embodiments

FIG. 1 shows a schematic representation of a first embodiment of a trained as a hammer hammer power tool 10a with a pistol-shaped portable power tool housing 86a. The hand tool 10a has a main handle 46a angled with respect to a main working direction 44a, which is integral with the hand tool housing 86a. In a front region 48a of the hand tool 10a, there are an auxiliary handle 50a, a tool chuck 52a, a tool 54a designed as an SDS-plus drill bit, and a control element 56a. By means of the control element 56a, a non-illustrated operator can make a change of operating mode.

In FIG. 2 is an internal view of a gear assembly 57a of the power tool 10a shown in a schematic representation, which is intended to change the operating mode of the power tool 10a. The hand tool 10a has a motor shaft 14a, which is not shown in more detail Motor is driven, and a work spindle 12a on. An axis of rotation 58a of the motor shaft 14a extends parallel to the main operating direction 44a and parallel to a rotation axis 60a of the work spindle 12a. In the work spindle 12a and in the main working direction 44a in front of and behind the work spindle 12a, there is housed an impulse generating device, only partly shown, having a lift generator 32a. Furthermore, the handheld power tool 10a has an intermediate shaft 16a arranged parallel to the work spindle 12a. The intermediate shaft 16a is axially displaceably mounted to a mode change by means of the operating element 56a and has an external toothing 62a which transmits a torque in at least one operating mode to the working spindle 12a designed as a hammer tube. Furthermore, the hand tool 10a has a toothed sleeve 18a, which transmits a torque from the motor shaft 14a to a switching element 22a during operation.

The toothed sleeve 18a is fixed in an axial direction 20a by means of the portable power tool housing 86a with respect to the motor shaft 14a. For a mode change, the hand tool 10a, the switching element 22a, which is axially displaceable for a mode change over the toothed sleeve 18a. A transmission of the torque from the toothed sleeve 18a to the switching element 22a takes place by means of a coupling element 24a designed as a splined shaft profile, which connects the switching element 22a and the toothed sleeve 18a in a rotationally fixed manner to one another.

In addition, the hand tool 10a has the hoist generator 32a, with a transmission element 64a and with an eccentric 66a, and a spring element 26a. The motor shaft 14a has, at an end located in the main working direction 44a, a toothing 68a which, together with a toothing 70a of the toothed sleeve 18a, forms a helical gear. The toothed sleeve 18a is formed as a hollow shaft having three outer radii decreasing along the main working directions 44a and two inner radii decreasing in a radial direction along the main working directions 44a. In the region of the largest outer radius, which is formed by a pressed-on the toothed sleeve 18 a ring, the toothing 70 a is arranged. A transition 72a between the middle and the small outer radius to a support serves in the axial direction as a support surface for the spring element 26a. A transition 74a between the large and the small inner radius serves as a bearing surface for a bearing 76a. The bearing 76a supports the Tooth sleeve 18a in a housing member 36a, which is indirectly connected via the bearing member 34a with the power tool housing 86a. The toothed sleeve 18a encloses the switching element 22a in a region 78a lying in the main working direction 44a and extending in a tubular manner parallel to the main working direction 44a.

The spring element 26a shifts the switching element 22a in the mode change between drilling operation and Schlagbohrbetrieb and is designed as a helical spring. For this purpose, the spring element 26a is supported on the toothed sleeve 18a and the switching element 22a and presses apart the two elements 18a, 22a in an axial direction. Further, the spring element 26a presses the switching element 22a during the chisel operation and the Schlagbohrbetriebs against the transmission element 64a of the Huberzeugers 32a, thus enabling a rotationally fixed connection between the switching element 22a and the transmission element 64a. The spring element 26a partially encloses the toothed sleeve 18a and the switching element 22a in a region extending in a tubular manner parallel to the main working direction 44a.

The hand tool 10a has a first connecting element 28a, which rotatably connects the intermediate shaft 16a and the switching element 22a in a drilling operation and a percussion drilling operation. The first connection element 28a is designed as a spline. In a chisel operation, the intermediate shaft 16a is axially displaced by means of the operating element 56a in the main working direction 44a. Thereby, the first connecting member 28a opens by moving the intermediate shaft 16a away from the shifting member 22a, and no torque is transmitted to the intermediate shaft 16a and thus to the work spindle 12a and the tool 54a.

The hand tool 10a has a second connecting element 30a, which rotatably connects the switching element 22a and the transmission element 64a of the Huberzeugers 32a in a chisel operation and a percussion drilling together. The second connection member 30 a is formed as a spline toothing, which is arranged on the switching element 22 a in the main working direction 44 a at an outer radius. In a drilling operation, the intermediate shaft 16a is displaced axially by means of the operating element 56a counter to the main working direction 44a. The Intermediate shaft 16a thereby also displaces the switching element 22a counter to the main working direction 44a against a spring pressure of the spring element 26a. As a result, the second connection element 30a opens. No torque is transmitted to the transmission element 64a and thus to the elevator 32a.

In the Figures 3 . 4 and 6 to 10 Further embodiments of the invention are shown. To distinguish the embodiments, the letter a in the reference numerals of the embodiment in the FIGS. 1 . 2 and 5 by the letters b to h in the reference numerals of the embodiments in the Figures 3 . 4 and 6 to 10 replaced. The following descriptions are essentially limited to the differences between the embodiments, with respect to the same components, features and functions on the description of the other embodiments, in particular in the FIGS. 1 . 2 and 5 can be referenced.

FIG. 3 shows a hand tool 10b, in contrast to the first embodiment in FIG. 2 a spring element 26b and a toothed sleeve 18b are partially disposed within a switching element 22b. The switching element 22b partially encloses the toothed sleeve 18b. Here, the spring element 26b is disposed within the toothed sleeve 18b and the switching element 22b. As bearing surfaces for the spring element 26b serve within the toothed sleeve 18b and within the switching element 22b arranged webs 80b.

Further shows FIG. 4 a hand tool 10c, in which, in contrast to the first embodiment in FIG. 2 , a first connecting member 82c rotatably connects a tooth sleeve 18c and an intermediate shaft 16c in a drilling operation or a percussion drilling operation. The first connection element 82c is designed as a splined shaft profile and is arranged within the toothed sleeve 18c. In this case, a switching element 22c is arranged coaxially with the intermediate shaft 16c. The switching element 22c partially encloses the toothed sleeve 18c in a region extending in a tubular manner parallel to the main working direction 44a. In a drilling operation and a percussion drilling operation, the intermediate shaft 16c engages in the spline profile of the toothed sleeve 18c. In a chisel operation, the intermediate shaft 16c is displaced and moves in a spline-free region 84c of the toothed sleeve 18c.

In this case, no torque is transmitted from the toothed sleeve 18c to the intermediate shaft 16c.

FIG. 5 shows a detailed representation of the storage of the toothed sleeve 18a of the first embodiment FIG. 2 , For supporting the toothed sleeve 18a, the gear arrangement 57a has the additional bearing element 34a, which is designed as a stud bolt. The bearing element 34a is pressed into the housing element 36a formed as an intermediate flange and connected above it to the handheld power tool housing 86a. Axially, the bearing element 34a is secured by means of a snap ring 88a.

The gear arrangement 57a has, for a radial mounting of the toothed sleeve 18a, a needle bearing 90a which is arranged coaxially with the toothed sleeve 18a between the bearing element 34a and the toothed sleeve 18a. Axially, the toothed sleeve 18a is mounted by means of a disk 92a inserted in the toothed sleeve 18a. The needle bearing 90a and the disc 92a may be made in one piece.

Further shows FIG. 6 an alternative storage of a toothed sleeve 18d. In this case, a bearing pin 38d instead of a stud bolt according to FIG. 5 intended. The bearing pin 38d is made in one piece with a housing element 36d made of light metal and thus connected to a portable power tool housing 86d. An axial and radial bearing takes place by means of a one-piece sheet metal pot 94d, which extends axially along the bearing pin 38d and radially along the housing member 36d. Alternatively, it is possible to make the sheet metal block 94d in multiple pieces as a sleeve and as a disk.

In an in FIG. 7 In the embodiment shown, a bearing element 34e configured as a stud is pressed into a toothed sleeve 18e. For a radial mounting, a gear arrangement 57e has a needle bearing 90e which is arranged between the bearing element 34e and a housing element 36e designed as an intermediate flange, which is connected to a handheld power tool housing 86e.

Further shows FIG. 8 an embodiment in which a bearing pin 96f is integrally formed on a toothed sleeve 18f. Thus, the bearing pin 96f and the toothed sleeve 18f made in one piece. Axial and radial mounting takes place by means of a sheet metal pot 94f which extends axially along the journal 96f and radially along the housing member 36f which is connected to a portable power tool housing 86f.

Another embodiment shows FIG. 9 , In the embodiment, a toothed sleeve 18g, on a side opposite to the main working direction 44g, has a radially extending extension 98g which includes an angled portion 100g in the main working direction 44g. The angled portion 100g has a toothing 68g, which is toothed with a motor shaft 14g. The toothed sleeve 18g is mounted in a transmission element 64g of a Huberzeugers 32g, which is designed as a swash bearing, by means of a designed as a sliding bearing 40g. Axially, the toothed sleeve 18g is mounted by means of a disc 92g against a housing element 36g and thus against a portable power tool housing 86g.

FIG. 10 shows a disposed within a toothed sleeve 18h in the toothed sleeve 18h pressed-in bearing 42h, which is designed as a deep groove ball bearing. The bearing 42h is axially fixed with a retaining ring 102h on an additional bearing element 34h designed as a heel screw and thus mounted against a housing element 36h and a handheld power tool housing 86h.

Claims (10)

1. Hand-held power tool, in particular a hammer drill, having a work spindle (12a-h), a hand-held power tool housing (86a-h) and an intermediate shaft (16a-h) that is arranged parallelwise in relation to the work spindle (12a-h) and mounted in an axially displaceable manner for a change of operating mode, and a motor shaft (14a-h) arranged parallelwise in relation to the work spindle (12a-h), and having a toothed sleeve (18a-h) provided to transmit a torque to the intermediate shaft (16a-h), wherein the toothed sleeve (18a-h) is fixed in the axial direction (20a-h) by means of the hand-held power tool housing (86a-h), and having a switching element (22a-h), which is axially displaceable relative to the toothed sleeve (18a-h) for at least one change of operating mode, having a coupling element (24a-h), which connects at least the switching element (22a-h) and the toothed sleeve (18a-h) to one another in a rotationally fixed manner, wherein the coupling element (24a-h) is formed by a device that connects the switching element (22a-h) and the toothed sleeve (18a-h) to one another in a rotationally fixed manner irrespective of an axial displacement of the switching element (22a-h) and the toothed sleeve (18a-h) towards one another or away from one another, characterized by a connecting element (28a, 28b), realized as a spline, which connects the intermediate shaft (16a, 16b) and the switching element (22a, 22b) detachably to one another in a rotationally fixed manner in at least one operating mode.
2. Hand-held power tool according to Claim 1, characterized in that the coupling element (24a-h) is realized as a splined-shaft profile.
3. Hand-held power tool at least according to Claim 1 or 2, characterized in that the toothed sleeve (18a-h) at least partially surrounds the switching element (22ah) .
4. Hand-held power tool at least according to Claim 1 or 2, characterized by a spring element (26a-h), which is provided to displace at least the switching element (22a-h) at least in the case of a change of operating mode.
5. Hand-held power tool according to any one of the preceding claims, characterized by a spring element (26ah) that at least partially surrounds the toothed sleeve (18a-h) .
6. Hand-held power tool at least according to Claim 1 or 2, characterized by a connecting element (30a-c), which, in at least one operating mode, transmits at least a torque from the switching element (22a-c) to a stroke generator (32a-c).
7. Hand-held power tool according to any one of the preceding claims, characterized by an additional bearing element (34a, 34e, 34h), by means of which at least the toothed sleeve (18a, 18e, 18h) is seated.
8. Hand-held power tool according to Claim 7, characterized in that the additional bearing element (34a, 34h) is at least connected to a housing element (36a, 36h) in a rotationally fixed manner.
9. Hand-held power tool according to any one of the preceding claims, characterized by a journal (38d), which is realized in one piece with a housing element (36d) and by means of which at least the toothed sleeve (18d) is seated.
10. Hand-held power tool according to any one of the preceding claims, characterized by a bearing (40g), which seats at least the toothed sleeve (18g) in a stroke generator (32g).

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