CN108422386B

CN108422386B - Hand-held power tool

Info

Publication number: CN108422386B
Application number: CN201810148895.1A
Authority: CN
Inventors: A·施莱格尔; C·朗
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2017-02-15
Filing date: 2018-02-13
Publication date: 2023-06-27
Anticipated expiration: 2038-02-13
Also published as: CN108422386A; DE102017202371A1

Abstract

The invention relates to a hand-held power tool having a housing in which at least one impact mechanism unit is arranged, wherein the impact mechanism unit is designed to drive a tool insert in a linear oscillating manner along a working axis; the handle is connected to the housing by at least one first bearing unit, wherein the first bearing unit has a first guide element which is mounted in a pivotable manner and a second guide element which is mounted in a pivotable manner, and the two guide elements are guided in a movable manner in each other, wherein the first guide element is connected to the handle in a pivotable manner about a first pivot axis and the second guide element is connected to the housing in a pivotable manner about a second pivot axis. It is proposed that: the second pivot axis is arranged in front of the impact mechanism unit.

Description

Hand-held power tool

Technical Field

The invention relates to a hand-held power tool.

Background

In DE 10 2006 029 630A1, a hand-held power tool is provided with a vibration decoupling unit for decoupling the transmission of vibrations of the main element to the handle. For this purpose, the vibration decoupling unit has a spring element in the form of a leaf spring.

EP 1882 558a1 describes a hand-held power tool having a handle which is held on a housing by a spring-loaded decoupling assembly. The decoupling device comprises a rod-shaped element, in which the first partial element and the second partial element are guided telescopically relative to one another.

Disclosure of Invention

The invention relates to a hand-held power tool having a housing in which at least one impact mechanism unit is arranged, wherein the impact mechanism unit is designed to drive a tool insert in a linear oscillating manner along a working axis; the handle is connected to the housing by at least one first bearing unit, wherein the first bearing unit has a first guide element which is mounted in a pivotable manner and a second guide element which is mounted in a pivotable manner and which is guided in a movable manner in each other, wherein the first guide element is connected to the handle in a pivotable manner about a first pivot axis and the second guide element is connected to the housing in a pivotable manner about a second pivot axis. It is proposed that: the second pivot axis is arranged in front of the impact mechanism unit. Advantageously, a particularly compact support unit can be achieved thereby.

The second pivot axis is arranged upstream of the impact mechanism unit, in particular it being understood that the first pivot axis, the second pivot axis and the impact mechanism unit are arranged in succession (i.e. in the order written here) along the course of the working axis of the hand-held power tool.

Furthermore, it is proposed that the ratio between the width of the first bearing unit and the distance between the first pivot axis and the second pivot axis is less than 1. Advantageously, a narrow and ergonomic design of the housing of the hand-held power tool is thereby made possible. The width of the first bearing unit is to be understood as meaning, in particular, the width of the first and/or second guide element parallel to the first and second pivot axes. The distance between the pivot axes is to be understood as meaning, in particular, the maximum or minimum distance between the pivot axes of the first bearing unit, in particular all the lengths between the maximum distance and the minimum distance of the pivot axes of the first bearing unit. Preferably, the ratio of the width of the first support unit to the spacing between the first and second pivot axes is less than 0.8.

Furthermore, it is proposed that the first bearing unit has a decoupling unit which, in particular, in a portion of at least 10%, preferably at least 25%, in a plane which is open by the pivot axes of the first bearing unit and by its width, advantageously makes it possible to achieve an effective damping of the handle. The decoupling unit is in particular designed to damp the handle against vibrations occurring in the housing as a result of the impact mechanism unit. Preferably, the effect of the decoupling unit extends over a portion of at least 10%, preferably at least 25%, of the face.

Furthermore, it is proposed that the decoupling unit has at least one decoupling element, which is in particular embodied as a helical spring or as an elastomer element. Advantageously, a particularly efficient vibration decoupling is achieved by the decoupling element. Preferably, the decoupling element is supported on the first and second guide elements. Alternatively, it is also conceivable for the decoupling element to be fastened to the first guide element and for the decoupling element to be spring-loaded by an axial displacement of the first guide element relative to the second guide element, and thus in particular to form a spring-loaded end stop, or vice versa. Elastomeric elements are understood to be, in particular, foam materials. It is likewise conceivable for the decoupling element to be designed as a buffer element with a piston and with a cylinder filled with liquid or gas.

Furthermore, it is proposed that the decoupling unit has a first decoupling element and a second decoupling element arranged adjacent to one another. Advantageously, the damping efficiency can thereby be further improved. Adjacent in this context should be understood in particular as no further component is arranged between the first and the second decoupling element. Preferably, the first and second decoupling elements are substantially identically configured.

Furthermore, it is proposed that the first guide element and/or the second guide element have a screw receiving seat (Schraubdom) which extends perpendicularly to one of the pivot axes of the first bearing unit and is designed to guide the at least one decoupling element. Advantageously, the first and second guide elements are movably guided relative to each other by the screw receiving seats and the corresponding openings. Preferably, the first and/or the second guide element has two screw receptacles, however it is also conceivable to provide more than two screw receptacles.

Furthermore, it is proposed that the decoupling unit has at least one additional decoupling element, wherein the at least one decoupling element and the at least one additional decoupling element are arranged one after the other along the longitudinal direction of the first bearing unit and in particular between the pivot axes. Advantageously, the damping efficiency can thereby be further improved. The additional decoupling element may be supported on the first guide element and/or the second guide element. Preferably, the additional decoupling element acts in the same direction as the decoupling element. Alternatively, it is also conceivable for the additional decoupling elements to act in different directions. In particular, the additional decoupling element is arranged in a region in which the first guide element and the second guide element are guided in each other. Preferably, the additional decoupling element is arranged on the first guide element and/or the second guide element in such a way that the additional decoupling element forms an end stop for the spring action.

Furthermore, it is proposed that the decoupling unit has an adaptable decoupling element. Advantageously, the decoupling unit can thus be adapted to the dimensions desired in terms of vibration damping.

Furthermore, it is proposed that the hand-held power tool has a second bearing unit, via which the handle is connected to the housing in a movable manner, wherein the radial distance from the second bearing unit to the working axis is greater than the radial distance from the first bearing unit to the working axis, and the second bearing unit is in particular designed as a rotary joint, which connects the handle to the housing in a form-fitting and pivotable manner. Alternatively, it is also conceivable for the second bearing unit to be constructed similarly to the first bearing unit. It is likewise conceivable for the second bearing unit to be embodied as a rocker arm or as an elastomer.

The invention further relates to a support unit for a hand-held power tool, which is configured as described above.

Drawings

Further advantages result from the following description of the drawings. The drawings, description and claims contain many combined features. Those skilled in the art will also expediently consider the features individually and summarize them into meaningful further combinations.

It shows that:

fig. la is a schematic illustration of a hand-held power tool with a first support unit in a first embodiment;

fig. lb shows a partial section of the hand-held power tool according to fig. 1 a;

figure lc is another section of the first support unit according to figure 1 a;

fig. 2 is a cross section of the first support unit in the second embodiment;

fig. 3 is a cross section of the first support unit in the third embodiment;

fig. 4 is a cross section of the first supporting unit in the fourth embodiment;

fig. 5 is a schematic illustration of a hand-held power tool with a first support unit in a fifth embodiment.

Detailed Description

Fig. 1a shows a first embodiment of a hand-held power tool 10, which has a housing 12, to which a handle 14 is movably fastened by a first support unit 16 and a second support unit 18. The housing 12 and the handle 14 each comprise two housing half-shells, which can be connected to one another by means of a screw connection 20. For the sake of simplicity of illustration, the housing 12 is shown with only the first housing half 22, and the handle 14 is shown with only the first housing half 24. The hand-held power tool 10 is designed as a hammer drill. A drive unit 26 comprising a motor 25 is arranged on the housing 12 of the hand-held power tool 10. Furthermore, the hand-held power tool 10 has a transmission unit 28, which is designed to drive a plug-in tool 30, which is connectable to the hand-held power tool 10, rotationally about a working axis 32 and/or in an impact manner along the working axis 32. The working axis 32 is arranged perpendicular to the motor axis of the motor 25. In order to convert the rotary motion of the motor 25 into a reciprocating motion, the transmission unit 28 has an impact mechanism unit 34, which may be configured, for example, as an impact mechanism comprising an eccentric. The insert tool 30 is received at the end face of the hand-held power tool by a tool receiver 35 of the hand-held power tool 10. The handle 14 extends substantially perpendicularly to the working axis 32 and has an operating switch 36 for controlling the drive unit 26. Furthermore, an energy supply unit 38, which is embodied, for example, as a replaceable hand-held power tool battery 40, is arranged on the handle 14.

During impact operation of the hand-held power tool 10, strong vibrations occur along the working axis 32 and rotational vibrations occur, since the center of gravity of the hand-held power tool 10 is not located on the working axis 32, as determined by the structure. In order to damp vibrations along the working axis 32 as well as rotational vibrations, the handle 14 is pivotably connected to the housing 12 and is configured to damp vibrations by means of a decoupling unit 33.

The first bearing unit 16 is arranged above the working axis 32 and connects the handle 14 pivotably to the housing 12 via a first pivot axis 41 and a second pivot axis 42. Advantageously, the second pivot axis 42 of the first bearing unit 16 is arranged upstream of the impact mechanism unit 34, in order to enable a particularly compact construction of the hand-held power tool 10. The second bearing unit 18 is arranged below the working axis 32, wherein the distance from the second bearing unit 18 to the working axis 32 is greater than, in particular more than twice, the distance from the first bearing unit 16 to the working axis 32. The second bearing unit 18 connects the handle 14 to the housing 12 in a pivotable manner via a further pivot axis 43. The second support unit 18 is configured as a swivel hinge. For example, the dome 19 associated with the housing 12 is surrounded in a form-locking manner by a form-locking element associated with the handle 14.

The second pivot axis 42 of the first bearing unit 16 and the further pivot axis 43 of the second bearing unit 18 are arranged in the housing 12. By means of the additional pivot axis 41, the first bearing unit 16 is rotatably mounted on a circular-arc path, the radius of which corresponds to the distance between the first pivot axis 41 and the second pivot axis 42. Furthermore, the first support unit 16 has a decoupling unit 33 for damping vibrations. Advantageously, both vertical vibrations and vibrations along the working axis 32 and horizontal vibrations can thereby be damped by means of the first bearing unit 16.

Fig. 1b shows a partial section of the first support unit 16 in the installed state in the hand-held power tool 10. The first support unit 16 has a first guide element 46 supported in the handle 14 and a second guide element 48 supported in the housing 12, which are guided displaceably in each other. The first guide element 46 has a receiving bore 50 at its handle-side end, which receiving bore 50 is connected in a form-locking manner to a screw receiving seat 52 of the first housing half 24 of the handle 14 and can be pivoted about the screw receiving seat 52. The second guide element 48 has two receiving openings 56 at its housing-side end, into which pins 58 are inserted. The second guide element 48 is connected by means of a pin 58 in a form-locking manner to a receiving pocket 60, which is arranged on the inner side of the first and second housing half-

shells

22, 62 of the housing 12, and is rotatable about the receiving pocket 60.

The first guide element 46 is connected to the second guide element 48 by a screw connection 66. The first guide element 46 has two arms configured as screw receptacles 68, which extend perpendicularly to the first pivot axis 41. The screw receptacles 68 each extend through an opening 70 arranged at the handle-side end of the second guide element 48. The first guide element 46 is guided linearly through the openings 70 of the second guide element 48. The first guide element 46 is received so rigidly that lateral movement is prevented. However, it is also conceivable for the first guide element 46 to be received with play, so that the decoupling unit 33 can also receive the transverse force at least in part. A disk 74 is fastened to the end of the screw receptacle 68 by means of a second screw 72. The first guide element 46 is guided in an axially movable manner between the two end stops, in particular between the opening 70 of the second guide element 48 and the pin 58, by means of a disk 74 which is fixed by means of a second screw 72.

In order to efficiently damp vibrations acting on the handle 14, the first support unit 16 has a decoupling unit 33, which in this embodiment comprises two identical decoupling elements 78. The decoupling elements 78 are each designed as a coil spring 80, which surrounds the screw receptacles 68 and is guided by them. The decoupling member 78 is resiliently supported on the first guide member 46 and the second guide member 48. Advantageously, the first bearing unit 16 has at least one stop element 82 which additionally limits the axial displaceability of the first guide element 46 in the second guide element 48 and thus forms an end stop. For example, two stop elements 82 are formed on the first guide element 46, which surround the decoupling element 78 on its side. By means of the stop element 82 it is advantageously ensured that the spiral spring 80 is not over-compressed, which could damage the spiral spring 80.

Fig. 1c shows a longitudinal section through the first support unit 16. Advantageously, the first support unit 16 is configured as a fitting element which can be accommodated in the handle 14 and the housing 12 and is held in a form-fitting manner by said latter. The ratio between the width 84 of the first support unit 16 and the distance 86 between the two

pivot axes

41, 42 of the first support unit 16 is less than 0.8, in order to achieve a particularly narrow design of the hand-held power tool 10. The decoupling unit 33 (in particular the two decoupling elements 78) advantageously occupies a proportion of more than 25% in the area spanned by the distance 86 between the pivot axes 41, 42 and the width 84 of the first bearing unit 16, so that a high damping efficiency can be ensured despite the compact design of the first bearing unit 16.

Fig. 2 shows a second embodiment of the first support unit 16, which differs essentially in that the decoupling element 78 of the decoupling unit 33 is embodied as an elastomer element 87. The elastomeric member 87 is supported on the first guide member 46 and the second guide member 48. Advantageously, a greater proportion of the surface that is widened by the first support unit 16 can be occupied by the elastomer element 87, as a result of which the efficiency of the decoupling unit 33 can be further increased.

Fig. 3 shows a third embodiment of the first support unit 16. In this embodiment, the decoupling unit 33 has two different decoupling elements 78. As already explained in the first exemplary embodiment, the first decoupling element 78 is designed as a coil spring 80, which is supported on the first guide element 46 and the second guide element 50. The additional decoupling element 88 is configured as an elastomer element 87 and is fixed behind the opening 70 on the second guide element 48. The additional decoupling element 88 forms a sprung end stop 90 which delimits the axial movement of the first guide element 46 in the second guide element 48 in a damped manner.

Fig. 4 shows a fourth embodiment of the first support unit 16. In this embodiment, the decoupling unit 33 likewise has two different decoupling elements 78, 88. As already explained in the first exemplary embodiment, the first decoupling element 78 is designed as a coil spring 80, which coil spring 80 is supported on the first guide element 46 and the second guide element 48. The additional decoupling element 88 is arranged in a guide region of the first support unit 16, in particular in a guide region of the first guide element 46 in the opening 70 of the second guide element 48. The additional decoupling element 88 is configured as a rubber ring 91 that is inserted into the opening 70. A play in the guidance of the first bearing unit 16 is thereby advantageously achieved, through which transverse forces can also be received in a vibration-damped manner.

Fig. 5 shows a schematic view of a fifth exemplary embodiment of the first support unit 16. In this embodiment, the first guide element 46 is connected to an additional decoupling element 88 embodied as a leaf spring element 92. The leaf spring element 92 is preferably supported on the first guide element 46 and on a housing element 94 of the housing 12. The leaf spring element 92 surrounds the housing element 94 in such a way that the leaf spring element 92 is mounted so as to be pivotable about the housing element 94. Advantageously, the leaf spring element 92 is supported on the disc 74. Alternatively, the leaf spring element 92 is constructed integrally with the disc 74.

Instead of the embodiment shown in fig. 5, the second guide element 48 may also be connected to the housing 12 not by a pin 58 that engages into the receiving pocket 60, but may be partially configured as a leaf spring element 92. Advantageously, a particularly effective damping can thereby be achieved in the event of an uneven course of movement. In this embodiment, the first pivot axis 41 of the first bearing unit 16 is arranged above the working axis 32 of the hand-held power tool and the second pivot axis 42 is arranged below the working axis 32.

Claims

1. A hand-held power tool, comprising:

-a housing (12) in which at least one impact mechanism unit (34) is arranged, wherein the impact mechanism unit (34) is configured for driving the insertion tool (30) in a linear oscillating manner along a working axis (32);

a handle (14) which is connected to the housing (12) by a first bearing unit (16), wherein the first bearing unit (16) has a first guide element (46) which is mounted in a pivotable manner and a second guide element (48) which is mounted in a pivotable manner and which is guided in a movable manner in relation to one another, wherein the first guide element (46) is connected to the handle (14) in a pivotable manner about a first pivot axis (41) and the second guide element (48) is connected to the housing (12) in a pivotable manner about a second pivot axis (42),

characterized in that the second pivot axis (42) is arranged upstream of the impact mechanism unit (34), wherein the first pivot axis (41), the second pivot axis (42) and the impact mechanism unit (34) are arranged in sequence along the course of the working axis (32) of the hand-held power tool (10),

the first guide element (46) has a receiving bore (50) at its handle-side end, which is connected in a form-locking manner to a screw receiving seat (52) of the first housing half-shell (24) of the handle (14) and can be pivoted about the screw receiving seat (52).

2. Hand-held power tool according to claim 1, characterized in that the ratio between the width (84) of the first support unit (16) and the distance (86) between the first pivot axis (41) and the second pivot axis (42) is less than 1.

3. Hand-held power tool according to claim 1 or 2, characterized in that the first support unit (16) has a decoupling unit (33).

4. A hand-held power tool according to claim 3, characterized in that the decoupling unit (33) has at least one decoupling element (78).

5. Hand-held power tool according to claim 4, characterized in that the decoupling unit (33) has a first decoupling element and a second decoupling element arranged adjacent to one another.

6. Hand-held power tool according to claim 4, characterized in that the first guide element (46) and/or the second guide element (48) has a screw receptacle (68) which extends perpendicularly to one of the first and second pivot axes of the first bearing unit (16) and is designed to guide at least one decoupling element (78).

7. The hand-held power tool according to claim 5, characterized in that the decoupling unit (33) has at least one additional decoupling element (88), wherein the first decoupling element and the at least one additional decoupling element (88) are arranged one after the other along the longitudinal direction of the first support unit (16).

8. Hand-held power tool according to claim 4, characterized in that the decoupling unit (33) has an adaptable decoupling element.

9. The hand-held power tool according to claim 1 or 2, characterized in that the hand-held power tool (10) has a second bearing unit (18), by means of which the handle (14) is movably connected to the housing (12), wherein a radial distance of the second bearing unit (18) from the working axis (32) is greater than a radial distance of the first bearing unit (16) from the working axis.

10. A hand-held power tool according to claim 3, characterized in that the decoupling unit occupies a proportion of at least 10% in a plane spanned by the first pivot axis, the second pivot axis and the width (84) of the first bearing unit (16).

11. The hand-held power tool according to claim 10, characterized in that the decoupling unit occupies a proportion of at least 25% in a plane spanned by the first pivot axis, the second pivot axis and the width (84) of the first bearing unit (16).

12. The hand-held power tool according to claim 4, characterized in that the decoupling element is designed as a spiral spring (80) or as an elastomer element (87).

13. Hand-held power tool according to claim 7, characterized in that the first decoupling element and the at least one additional decoupling element (88) are arranged between a first pivot axis and a second pivot axis.

14. A support unit for a hand-held power tool (10) according to any one of claims 1 to 13.