Integrated pre-tightening force limiting type retractor

Abstract

The invention relates to an integrated pre-tightening force limiting type retractor. The retractor comprises a movable shaft, a fixed shaft, a pre-tightening wheel, a support and a force limiting rod. One end of the movable shaft is mounted on a fixed shaft, and a pre-tightening wheel is mounted on the fixed shaft; a supporting ring is arranged at one end of the pre-tightening wheel; the periphery of the supporting ring is supported on the bracket; a bearing wheel is mounted at the outer end of the fixed shaft; a cover cap is supported in the radial direction of the bearing wheel; the supporting ring and the fixed shaft are integrally designed; one end of the supporting ring is in butt joint with the pre-tightening wheel, and the other end of the supporting ring is in butt joint with the movable shaft. The support has the advantages that the support ring and the fixed shaft are integrally designed, so that the support ring cannot move due to rotation of the pre-tightening wheel, and the support can be better supported in the radial direction; and the supporting ring cannot move due to rotation of the pre-tightening wheel, so that the support is better supported in the radial direction, and the force value in the force limiting stage is kept 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] Pre-tightening force-limiting seat belts are increasingly used, and OEMs have higher and higher requirements for pre-tightening and force-limiting performance. They need to ensure a stable limit force value, which is mainly reflected in: 1) When the pre-tightening function ends and the force-limiting function is turned on ( That is to say, the "overshoot" of preload and force limit switch should not be too high; 2), the attenuation of preload force should be as small as possible; 3), the fluctuation range of the force value in the force limit stage should not be too large, and the consistency should be good (see Figure 6 ). [0003] In order to ensure that the limit force value of the retractor is stable, the technical solutions mainly adopted in the prior art are as follows: [0004] The so...

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

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