Overload clutch for a hand-held power tool

Patent metadata

Field	Value
Publication number	US-12551999-B2
Application number	US-202418581634-A
Country	US
Kind code	B2
Filing date	Feb 20, 2024
Priority date	Feb 20, 2023
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

An axial bearing for reducing wear is provided in an overload clutch for arrangement between a drive unit and a power take-off unit of a hand-held power tool in order to enable decoupling of the drive unit from the power take-off unit in the hand-held power tool when a limit torque is exceeded.

First claim

What is claimed is:

1 . An overload clutch designed to be arranged between a drive unit and a driven unit of a hand-held power tool that is driven by the drive unit, the overload clutch comprising:
a rotating slip clutch configured to be connected between the drive unit and the driven unit in the hand-held power tool and to enable decoupling of the drive unit from the driven unit when a limit torque is exceeded; and an axial bearing disposed in said rotating slip clutch and configured to reduce wear between rotating components of the rotating slip clutch, wherein;
the rotating slipping clutch has an associated axis of rotation and includes a spring element and detent bodies acted upon by the spring element; and
the axial bearing is arranged in the direction of the axis of rotation between the spring element and the detent bodies.

2 . The overload clutch according to claim 1 , further comprising:
a drive coupling element directly engagable to the drive unit and defining an internal receptacle configured to receive the detent bodies; and a further coupling element which includes an outer circumference disposed within said internal receptacle and which defines a guide path for guiding the detent bodies, wherein the axial bearing is arranged in a direction perpendicular to the axis of rotation between the internal receptacle of the drive coupling element and the outer circumference of the further coupling element.

3 . The overload clutch according to claim 1 , further comprising:
a drive coupling element directly engagable to the drive unit; a power take-off coupling element directly engagable to the driven unit; and said rotating slip clutch includes a clutch shaft operatively connecting said drive coupling element to said power take-off coupling element.

4 . A hand-held power tool, comprising:
a housing in which a drive unit is arranged for driving a driven unit that includes a tool holder; and the overload clutch arranged between the drive unit and the driven unit, wherein the overload clutch includes;
a rotating slip clutch configured to be connected between the drive unit and the driven unit in the hand-held power tool and to enable decoupling of the drive unit from the driven unit when a limit torque is exceeded; and
an axial bearing disposed in said rotating slip clutch and configured to reduce wear between rotating components of the rotating slip clutch, wherein;
the rotating slipping clutch has an associated axis of rotation and includes a spring element and detent bodies acted upon by the spring element; and
the axial bearing is arranged in the direction of the axis of rotation between the spring element and the detent bodies.

5 . The hand-held power tool according to claim 4 , wherein:
the drive unit is a rotary drive unit having a first axis of rotation; the driven unit is a rotary unit having a second axis of rotation; and said overload clutch has a third axis of rotation arranged parallel displaced to the first axis of rotation of the drive unit and perpendicular to the second axis of rotation of the driven unit.

6 . The hand-held power tool according to claim 4 , wherein the overload clutch includes a drive coupling element operatively engaged to the drive unit.

7 . The hand-held power tool according to claim 4 , wherein the overload clutch includes a power take-off coupling element which is operatively connected to the driven unit.

8 . The hand-held power tool according to claim 4 , wherein:
the hand-held power tool is configured as a hammer drill; and the driven unit is configured for percussive actuation of a tool holder connected to the driven unit.

9 . The hand-held power tool according to claim 8 , wherein:
the driven unit is further configured for the rotating drive of the tool holder; and the drive unit includes an eccentric unit for the percussive actuation of the tool holder by the driven unit.

10 . The hand-held power tool according to claim 6 , wherein:
the drive coupling element is directly engaged to the drive unit and defines an internal receptacle configured to receive the detent bodies; and the overload clutch includes a further coupling element which includes an outer circumference disposed within said internal receptacle and which defines a guide path for guiding the detent bodies, wherein the axial bearing is arranged in a direction perpendicular to the axis of rotation between the internal receptacle of the drive coupling element and the outer circumference of the further coupling element.

11 . The hand-held power tool according to claim 6 , wherein:
the drive coupling element is directly engaged to the drive unit; and the overload clutch further includes; a power take-off coupling element directly engaged to the driven unit; and said rotating slip clutch includes a clutch shaft operatively connecting said drive coupling element to said power take-off coupling element.

Assignees

• Bosch Gmbh Robert

Inventors

• Weinbrecht Maximilian
• Haigis Michael
• Mustafa Selim
• Duerr Thomas

Classifications

• B25D2250/165

  Overload clutches, torque limiters · CPC title

• B25D2250/331

  Use of bearings · CPC title

• B25D2250/321

  Use of balls · CPC title

• B25F5/001

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

• F16D43/21

  with friction members {(slip couplings of the friction type F16D7/02)} · CPC title