An integrated pre-tightening force-limiting retractor

Abstract

The invention relates to an integrated pre-tightening force-limiting retractor, the retractor includes a moving shaft, a fixed shaft, a pre-tightening wheel, a bracket, and a force-limiting rod; one end of the moving shaft is installed on the fixed shaft , the fixed shaft is equipped with a pre-tightening wheel; one end of the pre-tightening wheel is provided with a support ring; the outer periphery of the support ring is supported on the bracket; the outer end of the fixed shaft is equipped with a load wheel; The radial support of the bearing wheel has a cover; the support ring and the fixed shaft are designed in one piece; one end of the support ring is docked with the pretension wheel, and the other end is docked with the moving shaft. Its advantages are as follows: the integrated design of the support ring and the fixed shaft prevents the support ring from shifting due to the rotation of the pre-tensioner wheel, thereby better radially supporting the bracket; Rotation and displacement, so as to better radially support the stent, so that the force value in the force-limiting stage remains stable.

Description

technical field [0001] The invention relates to the technical field of retractors, in particular to an integrated pre-tightening force-limiting retractor. Background technique [0002] The pre-tightening and force-limiting seat belts are increasingly used, and the OEMs have higher and higher requirements for pre-tightening and force-limiting performance, and it is necessary to ensure that the force-limiting value is stable, which is mainly reflected in: 1) When the pre-tightening function ends and the force-limiting function is turned on ( That is, when switching between preload and force limit), the "overshoot" should not be too high; 2), the attenuation of the preload force should be as small as possible; 3), the force value fluctuation range in the force limit stage should not be too large, and the consistency should be good (see Image 6 ). [0003] In order to ensure that the force limit value of the retractor is stable, the technical solutions mainly adopted in the pri...

AI Technical Summary

Problems solved by technology

[0005] The problem with this structure: when preloading, the preloading force acts on the ball concave of the "pretensioning wheel" and transmits it to the "moving shaft", which is supported on the "bracket"

However, there are problems with this solution: although the "bearing ring" is beneficial to reduce the bending moment, it cannot eliminate the bending moment more completely. When a larger preload is encountered, the bending moment will still affect the limit force value. Stationary, so there is still room for improvement in its structure

Secondly, the bearing ring is prone to axial displacement

[0007] To sum up, there is an urgent need for a retractor that can maintain balance, eliminate bending moments, and prevent axial displacement, thereby ensuring a stable limit force value, and there is no report on this retractor so far

Images