Hand-held power tool which includes a torque clutch

Patent metadata

Field	Value
Publication number	US-10940580-B2
Application number	US-201514950161-A
Country	US
Kind code	B2
Filing date	Nov 24, 2015
Priority date	Dec 4, 2014
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

In a hand-held power tool, a torque clutch associated with an output spindle, a transmission element axially displaceable in the direction of a longitudinal center axis of the output spindle, a locking element axially immovable in the direction of the longitudinal center axis and movable in a plane transverse to the longitudinal center axis, for activating and deactivating the torque clutch, the locking element enabling, in at least a first operating position, axial displaceability of the transmission element in the direction of the longitudinal center axis to activate the torque clutch, and in at least a second operating position, for at least limiting the axial displaceability of the transmission element to deactivate the torque clutch, in the second operating position of the locking element, the output spindle being at least essentially axially immovable relative to the gear housing in the direction of the longitudinal center axis.

First claim

What is claimed is:

1. A hand-held power tool, comprising:
a gear, in a gear housing, for driving an output spindle, wherein the gear comprises an annulus gear;
a torque clutch associated with the output spindle;
wherein the gear is configured as a planetary gear, at least one detent cam being formed on the annulus gear of a gear stage of the planetary gear facing the torque clutch, wherein the torque clutch comprises a transmission element, wherein the transmission element is axially displaceable in the direction of a longitudinal center axis of the output spindle;
at least one detent body, wherein the at least one detent body is situated between the annulus gear and a side of the transmission element facing the annulus gear, and the transmission element is axially pretensioned against the annulus gear with the aid of at least one compression spring, the at least one compression spring resting against a side of the transmission element facing away from the gear and being supported on an associated spring retainer; and
a locking element, which is configured to be axially immovable in the direction of the longitudinal center axis and which is configured to be movable in a plane transverse to the longitudinal center axis, for activating and deactivating the torque clutch,
wherein at least one support element which points in the direction of the transmission element is formed on the locking element, the support element being formed outside of the locking element on a first end-face of the locking element,
wherein the at least one support element is configured for enabling, in at least a first operating position of the locking element, axial displaceability of the transmission element in the direction of the longitudinal center axis to activate the torque clutch, and in at least a second operating position of the locking element, for at least limiting the axial displaceability of the transmission element to deactivate the torque clutch, in the second operating position of the locking element, the output spindle being at least essentially axially immovable relative to the gear housing in the direction of the longitudinal center axis,
wherein an axial position of the spring retainer is settable with the aid of an adjusting ring, which is rotatable about the longitudinal center axis of the output spindle, to adjust axial pretensioning of the at least one compression spring,
wherein when the torque clutch is activated, the support element on the locking element engages, at least in areas, in a recess in the transmission element so that the detent body skips over the detent cam when a preset torque is exceeded.

2. The hand-held power tool of claim 1 , wherein the locking element is configured at least for limiting, in at least a third operating position, the axial displaceability of the transmission element to deactivate the torque clutch, the output spindle in the third operating position of the locking element being axially movable relative to the gear housing in the direction of the longitudinal center axis.

3. The hand-held power tool of claim 2 , wherein the first operating position is associated with a screwdriving mode, the second operating position is associated with a drilling mode, and the third operating position is associated with a percussion drilling mode.

4. The hand-held power tool of claim 1 , wherein the locking element is a locking ring which is rotatable about the longitudinal center axis.

5. The hand-held power tool of claim 4 , wherein the locking ring is accommodated, secured against rotation, in an associated adjusting element.

6. The hand-held power tool of claim 1 , wherein an axial position of the spring retainer is settable with the aid of an adjusting ring, which is rotatable about the longitudinal center axis of the output spindle, to adjust axial pretensioning of the at least one compression spring.

7. The hand-held power tool of claim 1 , wherein the transmission element includes at least one recess.

8. The hand-held power tool of claim 1 , wherein the locking element includes at least one outwardly directed extension.

9. The hand-held power tool of claim 1 , wherein the gear housing has, at least in sections, a groove with at least one supporting rib for accommodating the locking element on its outer periphery in a circumferential direction with respect to the longitudinal center axis.

10. The hand-held power tool of claim 9 , wherein the groove and the at least one supporting rib are formed on the gear housing in the circumferential direction with respect to the longitudinal center axis.

11. The hand-held power tool of claim 9 , wherein the locking element is situated between the transmission element and the supporting rib in the longitudinal direction with respect to the longitudinal center axis.

12. The hand-held power tool of claim 9 , wherein the supporting rib supports the locking element in the longitudinal direction with respect to the longitudinal center axis to absorb axial forces introduced by the locking ring.

13. The hand-held power tool of claim 1 , wherein when the torque clutch is deactivated, the support element of the locking element limits an axial lift of the detent body and of the transmission element in a direction facing away from the gear, so that the detent body rests, at least in areas, against the detent cam of the annulus gear to deactivate the torque clutch.

14. The hand-held power tool of claim 1 , wherein the locking element is directly or indirectly lockable when the torque clutch is activated.

15. The hand-held power tool of claim 1 , wherein the hand-held power tool is a screwdriver.

16. The hand-held power tool of claim 1 , wherein the hand-held power tool is a screw drill.

17. The hand-held power tool of claim 1 , wherein the transmission element comprises a disc-shaped configuration.

18. A hand-held power tool, comprising:
a gear, in a gear housing, for driving an output spindle, wherein the gear comprises an annulus gear;
a torque clutch associated with the output spindle;
wherein the gear is configured as a planetary gear, at least one detent cam being formed on the annulus gear of a gear stage of the planetary gear facing the torque clutch, wherein the torque clutch comprises a transmission element, wherein the transmission element is axially displaceable in the direction of a longitudinal center axis of the output spindle;
at least one detent body, wherein the at least one detent body is situated between the annulus gear and a side of the transmission element facing the annulus gear, and the transmission element is axially pretensioned against the annulus gear with the aid of at least one compression spring, the at least one compression spring resting against a side of the transmission element facing away from the gear and being supported on an associated spring retainer; and
a locking element, which is configured to be axially immovable in the direction of the longitudinal center axis and which is configured to be movable in a plane transverse to the longitudinal center axis, for activating and deactivating the torque clutch,
wherein at least one support element which points in the direction of the transmission element is formed on the locking element, the support element being formed outside of the locking element on a first end-face of the locking element,
wherein the at least one support element is configured for enabling, in at least a first operating position of the locking element, axial displaceability of the transmission element in the direction of the longitudinal center axis to a

Assignees

• Bosch Gmbh Robert

Inventors

• Brennenstuhl Jens
• Roehm Heiko

Classifications

• B25B21/00 Primary

  Portable power-driven screw or nut setting or loosening tools; (details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00; {for mounting or dismounting wheels B60B29/006}); Attachments for drilling apparatus serving the same purpose (machines B23P19/06) · CPC title

• B25B23/141

  Mechanical overload release couplings · CPC title

• B25F5/001 Primary

  Gearings, speed selectors, clutches or the like specially adapted for rotary tools · CPC title

• B25B21/023

  for imparting an axial impact, e.g. for self-tapping screws · CPC title

• B25D16/006

  Mode changers; Mechanisms connected thereto · CPC title