Transmission, in particular for an adjustment drive

Patent metadata

Field	Value
Publication number	US-9541163-B2
Application number	US-201214365916-A
Country	US
Kind code	B2
Filing date	Oct 5, 2012
Priority date	Dec 14, 2011
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

The present invention relates to a transmission ( 1 ), in particular for an adjustment drive, comprising a housing ( 2 ), a worm shaft ( 3 ) which is rotatably mounted in the housing ( 2 ) and which can be driven, a worm wheel ( 4 ) which is rotatably mounted in the housing ( 2 ) and which meshes with the worm shaft ( 3 ), an encircling first wedge surface ( 5 ) which is formed on the worm wheel ( 4 ) or fixedly connected to the worm wheel ( 4 ), a brake element ( 6 ) which is arranged so as to be rotationally conjoint with respect to the worm wheel ( 4 ) and which has a second wedge surface ( 7 ), wherein the first wedge surface ( 5 ) bears areally against the second wedge surface ( 7 ).

First claim

What is claimed is:

1. A gear mechanism ( 1 ) comprising
a housing ( 2 ),
a driveable worm shaft ( 3 ) which is rotatably mounted in the housing ( 2 ),
a worm gear ( 4 ) which is rotatably mounted in the housing ( 2 ) and which meshes with the worm shaft ( 3 ),
an encircling first wedge surface ( 5 ) which is formed on the worm gear ( 4 ) or fixedly connected to the worm gear ( 4 ), and
a brake element ( 6 ) which is rotationally fixed with respect to the housing ( 2 ) and which has a second wedge surface ( 7 ),
wherein the first wedge surface ( 5 ) lies circumferentially against the second wedge surface ( 7 ).

2. The gear mechanism as claimed in claim 1 , characterized by at least one spring ( 8 ) which is arranged so as to press the first and second wedge surfaces ( 5 , 7 ) toward one another.

3. The gear mechanism as claimed in claim 2 , characterized in that the at least one spring ( 8 ) is supported with one end against the housing ( 2 ) and with another end against the brake element ( 6 ) in order to press the second wedge surface ( 7 ) against the first wedge surface ( 5 ).

4. The gear mechanism as claimed in claim 1 , characterized in that the first and second wedge surfaces ( 5 , 7 ) are inclined by the same angle (α) with respect to an axis of rotation ( 9 ) of the worm gear ( 4 ).

5. The gear mechanism as claimed in claim 1 , characterized in that an angle (α) between the first and second wedge surfaces ( 5 , 7 ) and an axis of rotation ( 9 ) of the worm gear ( 4 ) is less than 90° and greater than 0°.

6. The gear mechanism as claimed in claim 1 , characterized in that the first wedge surface ( 5 ) is formed over a full circumference on an inner surface of the worm gear ( 4 ) or on an inner surface of an element that is fixedly connected to the worm gear ( 4 ).

7. The gear mechanism as claimed in claim 1 , characterized in that the brake element ( 6 ) is in the form of a closed ring, wherein the second wedge surface ( 7 ) is formed over a full circumference on the ring.

8. The gear mechanism as claimed in claim 1 , characterized by a projection ( 15 ), which engages into the housing ( 2 ), on the brake element ( 6 ) for the purpose of preventing rotation of the brake element ( 6 ).

9. The gear mechanism as claimed in claim 1 , characterized by a self-locking gear mechanism stage ( 11 , 12 , 13 ), planetary gear mechanism stage or screw mechanism stage, at the drive output side of the worm gear ( 4 ).

10. An adjustment drive for a motor vehicle seat, comprising at least one gear mechanism ( 1 ) according to claim 1 and an electric motor for driving the worm shaft ( 3 ).

11. The gear mechanism as claimed in claim 1 , characterized in that an angle (α) between the first and second wedge surfaces ( 5 , 7 ) and an axis of rotation ( 9 ) of the worm gear ( 4 ) is between 85° and 5°.

12. The gear mechanism as claimed in claim 1 , characterized in that an angle (α) between the first and second wedge surfaces ( 5 , 7 ) and an axis of rotation ( 9 ) of the worm gear ( 4 ) is between 70° and 20°.

13. The gear mechanism as claimed in claim 1 , characterized in that an angle (α) between the first and second wedge surfaces ( 5 , 7 ) and an axis of rotation ( 9 ) of the worm gear ( 4 ) is between 60° and 30°.

14. The gear mechanism as claimed in claim 1 , characterized by an eccentric mechanism stage, planetary gear mechanism stage or screw mechanism stage, at the drive output side of the worm gear ( 4 ).

Assignees

• Bosch Gmbh Robert

Inventors

• Schmidt Willi
• Burger Anja
• Genter Gerhard

Classifications

• F16H1/16 Primary

  comprising worm and worm-wheel · CPC title

• F16H57/0006 Primary

  Vibration-damping or noise reducing means specially adapted for gearings (devices for varying tension of belts, ropes or chains with damping means F16H7/0829; toothed members with construction providing vibration damping F16H55/14; reducing vibrations or noise of the gearbox casing F16H57/028; suppression of vibrations or noise of gear selectors F16H59/0208; control of hydrostatic fluid gearing preventing or reducing vibrations or noise F16H61/4183) · CPC title

• B60N2/166

  Worm and worm gear articulations · CPC title

• B60N2/24

  for particular purposes or particular vehicles · CPC title

• Y10T74/19828

  Worm · CPC title