Self-locking belt retractor anti-rattle action on its belt-strap-sensitive control system that is effective in the winding direction of the belt shaft

Patent metadata

Field	Value
Publication number	US-9738249-B2
Application number	US-201214369506-A
Country	US
Kind code	B2
Filing date	Dec 18, 2012
Priority date	Dec 27, 2011
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A self-locking belt retractor for seat belts having a belt-strap-sensitive control mechanism with a control disc coupled to the belt shaft to control a locking element, by means of a pin moveably in an oblong hole in the control disc. The control disc carries an inertia element that, when triggered, radially swivels to lock the retractor belt shaft engages into a stationary toothed section. A control clip has two spaced apart legs on a friction mount between a blocking position of the inertia element and a release position. A follower forms stop surfaces engageable with the clip legs to carry the control clip during the rotation of the control disc belt winding direction a belt extension direction. The control clip releases the inertia element in the release position. One spring leg extends with an end into the movement path of the pin in the oblong hole.

First claim

The invention claimed is:

1. A self-locking belt retractor for seat belts of a type having a belt shaft mounted so as to rotate in a housing frame and tensioned by a winding spring in the winding direction of the belt strap and having at least one belt-sensitive control mechanism which has a control disc coupled to the belt shaft to control a locking element arranged on the belt shaft and deflected during a relative rotation between the belt shaft and the control disc until engaging in the housing frame, and the locking element engages by means of an oblong hole configured in the control disc and is coupled therein during the relative rotation by means of a pin guided between the control disc and the belt shaft, wherein the control disc carries a two-armed inertia element eccentrically swivel-mounted on the control disc via a rotational mount radially offset from a central rotational axis of the control disc, wherein the two-armed inertia element, when triggered, swivels radially against the action of a return spring with a blocking arm until it engages into a stationary toothed section by angular acceleration acting on the control disc, and as a result the control disc stops its rotational movement and is stationary, and comprising a control clip having central area and first and second legs that are spaced apart from each other in the peripheral direction and mounted to the belt shaft by means of a friction mount impeding a movement of the control clip relative to the control disc between a blocked position on the inertia element and a release position on a follower, the control clip protruding from the plane of the control disc, the first and second legs of the control clip having positions arranged in a plane above the inertia element and spaced apart from the plane of the control disc and encompass the follower between them and having sections reaching into the plane of the control disc, wherein the follower forms stop surfaces for the first and second legs to carry the control clip during the rotation of the control disc both in the belt winding direction and in a belt extension direction, such that the control clip releases the inertia element during rotation of the control disc in the belt extension direction and prevents the inertia element from swiveling during rotation of the control disc in the belt winding direction, and wherein furthermore the second leg, used to carry the control clip in the belt winding direction, extends with the section into the movement path of the pin in the oblong hole during the rotation of the control disc in the belt winding direction, and as a result fixes the locking element.

2. The self-locking belt retractor according to claim 1 , wherein the section configured on the second leg of the control clip consists of a section bent relative to the control disc in the peripheral direction of the control disc on a fixing section of the second leg, which during the rotation of the control disc in the belt winding direction rests against the end of the pin protruding over the plane of the control disc.

3. The self-locking belt retractor according to claim 2 , wherein the follower has a height perpendicular to the plane of the control disc, wherein the oblong hole configured in the control disc is enclosed by a guiding rim projecting from the plane of the control disc and the end of the pin overlapping the plane of the control disc having, perpendicular to the plane of the control disc, a height which does not exceed the height of the follower arranged on the control disc.

4. The self-locking belt retractor according to claim 3 , wherein the bent section of the second leg arranged for the fixation of the locking element including the fixing section arranged thereon penetrates into the space encompassed by the guiding rim enclosing the oblong hole, and that the rim has a through-hole for the penetration of the free end of the fixing section.

5. The self-locking belt retractor according to claim 1 , wherein the second leg interacting with the pin is formed by a separate damper component forming a component of the control clip which extends into the oblong hole with a cam protruding therefrom toward the control disc during the rotation of the control disc in the belt winding direction and thereby fixes the pin in the oblong hole, wherein a slot is additionally configured in the control disc passing over to the oblong hole to guide and carry the cam during the relative rotation of the control clip with respect to the control disc.

6. The self-locking belt retractor according to claim 5 , wherein the damping component additionally forms the central area of the control clip and the first arm of the control clip is configured as a bent wire part or a stamped bent part and is fixed to the mounting area of the damper component.

7. The self-locking belt retractor according to claim 5 , further comprising an extension protruding toward the control disc and configured on the damper component which intersects with the stop surface of the follower in the belt winding direction.

8. The self-locking belt retractor according to claim 1 , wherein the belt retractor has a vehicle-sensitive sensor and the control disc has an external gear for the interaction with the vehicle-sensitive sensor, wherein the external gear is rotatably arranged on the control disc at a predefined rotation angle and is pre-tensioned in an initial position against the control disc by means of a supporting spring between the external gear and the control disc.

9. The self-locking belt retractor according to claim 8 , wherein a torsion angle between the control disc and the external gear is designed to measure from 7.5 degrees to 22.5 degrees.

10. The self-locking belt retractor according to claim 1 , wherein the second leg of the control clip interacts with the follower to limit movement of the first leg into engagement with the inertial mass.

11. The self-locking seat by retractor according to claim 1 , wherein the control clip is formed as a single piece of wire forming a semicircular bearing area with the first and second legs extending therefrom.

12. The self-locking belt retractor according to claim 1 , wherein the follower is an integral part of the control disc.

Assignees

• Autoliv Develpement AB
• Autoliv Dev

Inventors

• Heine Volkmar
• Bosse Uwe
• Weiss Melanie

Classifications

• B60R22/38 Primary

  responsive only to belt movement · CPC title