US-12617370-B2 - Self-locking belt retractor

US12617370B2US 12617370 B2US12617370 B2US 12617370B2US-12617370-B2

Abstract

A self-locking belt retractor comprising a belt shaft which is rotatably mounted in a frame, wherein a safety belt can be wound up said belt shaft, a blocking device which blocks the belt shaft if a predetermined feed-out acceleration of the safety belt in the feed-out direction of the safety belt is exceeded, and comprising a control disc device mounted on the belt shaft, the control disc device comprising a control disc and an inert mass which is mounted on the control disc so as to be pivotable about a pivot axis.

Inventors

Julian Strauss
Markus Hueg
Arne Bargmann

Assignees

AUTOLIV DEVELOPMENT AB

Dates

Publication Date: 20260505
Application Date: 20220711
Priority Date: 20210722

Claims (10)

1 . A self-locking belt retractor having a frame, a belt shaft rotatably mounted in the frame, on which a safety belt can be wound, a blocking apparatus which blocks the belt shaft when a predetermined pull-out acceleration of the safety belt is exceeded in the pull-out direction of the safety belt, and a control disc device mounted on the belt shaft, wherein the control disc device comprises a control disc and an inertia mass which is pivotably mounted on the control disc about a pivot axis, wherein a pretensioning apparatus superimposes and pretensions the inertia mass parallel to the pivot axis in the direction of the control disc.
2 . The belt retractor according to claim 1 , wherein the pretensioning apparatus is fixed to the control disc as a separate component.
3 . The belt retractor according to claim 1 , wherein the pretensioning apparatus has a deflectable spring arm which extends parallel to the control disc.
4 . The belt retractor according to claim 1 , wherein at least one tapering protrusion is provided to form the pivot axis.
5 . The belt retractor according to claim 4 , wherein a receptacle for a tapering protrusion is designed as a cone-shaped trough.
6 . A self-locking belt retractor having a frame, a belt shaft rotatably mounted in the frame, on which a safety belt can be wound, a blocking apparatus which blocks the belt shaft when a predetermined pull-out acceleration of the safety belt is exceeded in the pull-out direction of the safety belt, and a control disc device mounted on the belt shaft, wherein the control disc device comprises a control disc and an inertia mass which is pivotably mounted on the control disc about a pivot axis, wherein a pretensioning apparatus is provided, which pretensions the inertia mass parallel to the pivot axis in the direction of the control disc; the pretensioning apparatus has a deflectable spring arm which extends parallel to the control disc; and the spring arm has a receptacle for a protrusion designed on the inertia mass to form the pivot axis.
7 . A self-locking belt retractor having a frame, a belt shaft rotatably mounted in the frame, on which a safety belt can be wound, a blocking apparatus which blocks the belt shaft when a predetermined pull-out acceleration of the safety belt is exceeded in the pull-out direction of the safety belt, and a control disc device mounted on the belt shaft, wherein the control disc device comprises a control disc and an inertia mass which is pivotably mounted on the control disc about a pivot axis, wherein a pretensioning apparatus is provided, which pretensions the inertia mass parallel to the pivot axis in the direction of the control disc; the pretensioning apparatus has a deflectable spring arm which extends parallel to the control disc; and the spring arm has a protrusion which engages in a receptacle in the inertia mass to form the pivot axis.
8 . A self-locking belt retractor having a frame, a belt shaft rotatably mounted in the frame, on which a safety belt can be wound, a blocking apparatus which blocks the belt shaft when a predetermined pull-out acceleration of the safety belt is exceeded in the pull-out direction of the safety belt, and a control disc device mounted on the belt shaft, wherein the control disc device comprises a control disc and an inertia mass which is pivotably mounted on the control disc about a pivot axis, wherein a pretensioning apparatus is provided, which pretensions the inertia mass parallel to the pivot axis in the direction of the control disc; the pretensioning apparatus has a deflectable spring arm which extends parallel to the control disc; and a deflectable end of the spring arm is surrounded at least in portions by a locking web.
9 . A self-locking belt retractor having a frame, a belt shaft rotatably mounted in the frame, on which a safety belt can be wound, a blocking apparatus which blocks the belt shaft when a predetermined pull-out acceleration of the safety belt is exceeded in the pull-out direction of the safety belt, and a control disc device mounted on the belt shaft, wherein the control disc device comprises a control disc and an inertia mass which is pivotably mounted on the control disc about a pivot axis, wherein a pretensioning apparatus is provided, which pretensions the inertia mass parallel to the pivot axis in the direction of the control disc; the pretensioning apparatus has a deflectable spring arm which extends parallel to the control disc; and the spring arm has a stop projecting in the direction of the control disc at a distance from its deflectable end.
10 . A self-locking belt retractor having a frame, a belt shaft rotatably mounted in the frame, on which a safety belt can be wound, a blocking apparatus which blocks the belt shaft when a predetermined pull-out acceleration of the safety belt is exceeded in the pull-out direction of the safety belt, and a control disc device mounted on the belt shaft, wherein the control disc device comprises a control disc and an inertia mass which is pivotably mounted on the control disc about a pivot axis, wherein a pretensioning apparatus is provided, which pretensions the inertia mass parallel to the pivot axis in the direction of the control disc; at least one tapering protrusion is provided to form the pivot axis; and exactly two tapering protrusions are arranged on opposite sides of the inertia mass.

Description

The present invention relates to a self-locking belt retractor having a belt shaft which is rotatably mounted in a frame and on which a safety belt can be wound, a blocking apparatus which blocks the belt shaft when a predetermined pull-out acceleration of the safety belt is exceeded in the pull-out direction of the safety belt, and with a control disc device which is mounted on the belt shaft and which is particularly spring-biased in the direction of extension of the safety belt, wherein the control disc device comprises a control disk and an inertia mass which is mounted on the control disk so as to pivot about a pivot axis. The (virtual) pivot axis of the inertia mass is particularly aligned parallel to an axis of rotation of the belt shaft. Self-locking belt retractors are generally used in vehicle safety belt systems to retract an unfastened safety belt into a parking position and to allow variable extension of the safety belt with as little slack as possible. For this purpose, the belt retractor has a belt shaft that is rotatably mounted in a frame and spring-loaded in the winding direction, on which the safety belt can be wound. Further, the belt retractor has a blocking apparatus which is activated when a predetermined pull-out acceleration of the safety belt is exceeded, so that the belt shaft is subsequently blocked in the belt pull-out direction. The blocking apparatus comprises a blocking pawl mounted on the belt shaft, the movement of which is controlled by the control disc device mounted rotatably on the belt shaft. The control disc of the control disc device is spring-loaded in the belt pull-out direction of the belt shaft and rotates with the belt shaft below the predetermined pull-out acceleration of the safety belt. An inertia mass is pivotably mounted on the control disk, which pivots when the predetermined pull-out acceleration of the safety belt is exceeded and thereby engages in a frame-mounted toothing of the belt retractor and stops the control disk relative to the belt shaft. Stopping the control disc in turn activates the blocking apparatus, in that the blocking pawl mounted on the belt shaft executes a control movement forced by a guide in a control contour in the control disc into a toothing fixed to the frame. Due to the object described above, the inertia mass must have a certain mass, otherwise it will not pivot when the pull-out acceleration is exceeded. Further, the inertia mass must be pivotably mounted on the control disc, which rotates with the belt shaft, in such a manner that it can perform a relative movement with respect to the control disc for controlling the blocking apparatus. Due to the mass of the inertia mass and its bearing movement, vibrations impacting on the belt retractor can lead to unwanted noise being generated by the inertia mass. A self-locking belt retractor with the above features is known, for example, from DE 10 2010 046 980 A1. In the belt retractor described there, unwanted noise is prevented by a protrusion that limits the relative movement between the inertia mass and the control disc. The object of the present invention is to provide an alternative solution for avoiding unwanted noise. The object is solved by a self-locking belt retractor with the features of the independent claim. Advantageous further embodiments of the belt retractor are given in the dependent claims and in the preceding and following description, wherein individual features of the advantageous further embodiments can be combined with one another in a technically expedient manner. The object is solved in particular by a self-locking belt retractor with the features mentioned at the beginning, wherein a pretensioning apparatus is provided which pretensions the inertial mass parallel to the pivot axis in the direction of the control disc. Such a pretensioning apparatus could, for example, be realized by a spring that acts on the inertia mass parallel to the pivot axis. However, other deflectable/deformable elements can also be provided as pretensioning apparatus, which preload the inertia mass parallel to the pivot axis, but still allow a (small) relative movement between the inertia mass and the control disc parallel to the pivot axis. Such a preload parallel to the pivot axis of the inertia mass can prevent a movement of the inertia mass transverse to the plane of the pivoting movement of the inertia mass that causes rattling noises. Particularly if the force provided by the pretensioning apparatus acts directly on the pivot axis, the pivoting movement performed by the inertial mass is hardly or not at all influenced by the pretensioning apparatus. The pretensioning apparatus thus exerts a force parallel to the pivot axis on the inertia mass, as a result of which the inertia mass could move minimally parallel to the pivot axis under large forces, but does not perform any movements in normal operation. In this manner, the pretensioning apparatus compensates for the minimal c