Force-Limiting Device for a Seat Belt System

摘要

A force-limiting device (4) for a seat belt device having at least two parts (5, 11, 15) controlled with a frequency-dependent, defined movement for energy absorption, wherein the parts (5, 11, 15) that move the parts (5, 11, 15) undergo an undulating movement (Q) directed perpendicular to the feed movement (V) in the course of which the gearings (8, 10, 18, 19) alternatingly engage and disengage. An open spring washer exerts force to move the parts (5, 11, 15) toward one another and can be automatically increased after a preset belt extraction length. The spring washer (6) applies a varying spring force to the parts (5, 11, 15) moving toward one another during the movement.

主权项

1. A force-limiting device for a seat belt device comprising at least first and second parts controlled with a frequency-dependent defined movement, wherein the first and second parts moving relative to one another have respective first and second gearings engaging into one other, and the frequency-dependent, defined movement occurs such that the first and second parts execute a feed movement with respect to one another by an undulating movement perpendicular to the feed movement, the undulating movement causing the gearings to alternatingly engage and disengage, an open spring washer exerting a spring force for movement of the parts toward one another which force is increased after a preset seat belt extraction length, the open spring washer acts with a changing spring force on the first and second parts moving toward one another during the undulating movement, wherein one of the first and second parts is displaceably supported on a hub perpendicular to the feed movement, and on the first part a first stop surface is provided, and on the second part, a second stop surface is provided, against which the first and second stop surfaces first and second open ends of the spring washer come to rest during the movement.