Belt retractor

Patent metadata

Field	Value
Publication number	US-11066041-B2
Application number	US-201716309961-A
Country	US
Kind code	B2
Filing date	May 31, 2017
Priority date	Jun 20, 2016
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

The invention describes a belt retractor for a vehicle seat belt comprising a belt reel (12) supported for rotation in a frame, a sensor (16) for vehicle-sensitive blocking of the belt reel (12) and a mechanism (17) for disabling the sensor (16). Via a gear (18) supported for rotation on the frame and a cam follower (22) the belt reel (12) acts on the mechanism (17) for disabling the sensor (16) and can adjust the same.

First claim

The invention claimed is:

1. A belt retractor for a vehicle seat belt comprising a belt reel supported for rotation in a frame, a sensor for vehicle-sensitive blocking of the belt reel, a mechanism for disabling the sensor, a gear supported for rotation on the frame, and a cam follower connected to the gear by a friction coupling, the friction coupling causing the cam follower to rotate with the gear, the friction coupling permitting relative rotation between the gear and the cam follower when a friction moment of the friction coupling is overcome, the belt reel acting on and adjusting the mechanism for disabling the sensor via the gear, the friction coupling and the cam follower.

2. The belt retractor according to claim 1 , wherein the gear interacts with a pinion supported on the belt reel in a rotationally fixed manner via external teeth.

3. The belt retractor according to claim 1 , wherein the mechanism for disabling the sensor comprises a blocking lever supported for rotation which is adjustable between a disabling position in which it acts on a holding surface of the sensor and a release position in which it is spaced apart from the holding surface.

4. The belt retractor according to claim 3 , wherein the cam follower includes first and second stop faces interacting with the blocking lever to adjust the latter between the disabling position and the release position, with the stop faces being arranged to be adjacent each other.

5. The belt retractor according to claim 3 , wherein the cam follower comprises two stop faces offset in the circumferential direction for limiting a rotary motion of the cam follower relative to the blocking lever.

6. The belt retractor according to claim 3 , wherein the blocking lever is biased in a direction for disabling the sensor by a spring.

7. The belt retractor according to claim 1 , wherein a rotary motion of the belt reel is coupled to a rotary motion of the cam follower by means of the friction coupling, the friction coupling having a spring which biases at least one friction element so that the friction moment is generated between an input and an output of the friction coupling, wherein the spring is a coil spring made from metal.

8. The belt retractor according to claim 7 , wherein the at least one friction element is formed integrally with the cam follower.

9. The belt retractor according to claim 7 , wherein the spring is arranged between two friction elements and biases the friction elements in opposite directions.

10. The belt retractor according to claim 7 , wherein the at least one friction element interacts with a friction surface arranged on the gear.

11. The belt retractor according to claim 10 , wherein the gear is ring-shaped and the friction surface is arranged on the inner circumference thereof.

12. The belt retractor according to claim 11 , wherein the friction surface is ring-shaped.

13. The belt retractor according to claim 10 , wherein the friction surface is formed by at least one wall of a peripheral groove and the groove preferably has a V-shaped cross-section.

14. The belt retractor according to claim 13 , wherein the at least one friction element is at least partially received in the groove and the portions of the friction element received in the groove are designed to be corresponding to the cross-section of the groove.

15. The belt retractor according to claim 7 , wherein the at least one friction element is in the form of an elastic circular arc-shaped friction arm.

16. The belt retractor according to claim 1 , wherein the friction coupling includes the at least one friction element and a spring that biases the at least one friction element into engagement with the gear.

17. The belt retractor according to claim 16 , wherein the belt retractor includes two friction elements, the spring being arranged between the friction elements and biasing the friction elements in opposite directions into engagement with the gear.

18. The belt retractor according to claim 16 , wherein the gear is ring-shaped, the at least one friction element being biased into engagement with an inner circumference of the gear by the spring.

19. The belt retractor according to claim 16 , wherein the at least one friction element is formed integrally with the cam follower.

Assignees

• Trw Automotive Gmbh

Inventors

• Michel Frederic
• Patyk Pawel

Classifications

• B60R22/41 Primary

  with additional means for preventing locking {during unwinding} under predetermined conditions · CPC title

• B60R22/40

  responsive only to vehicle movement · CPC title

• B60R2022/401

  with adjustable sensor · CPC title