Torsion bar for seat belt retractor and seat belt retractor, seat belt assembly

Abstract

The invention provides a torsion bar for a safety belt coiling device. The torsion bar is in a bar shape and the axial length of the torsion bar is not more than the axial length of a coiling shaft; peripheral outer teeth are arranged at two end parts and the middle part of the torsion bar and the outer teeth at the two end parts of the torsion bar are matched with inner teeth of central concave holes of end faces of the two end faces on the coiling device; the peripheral outer teeth at the middle part are matched with inner teeth arranged at the middle section of a through hole at a central axis position of a core shaft; the torsion bar is divided from the middle part of the axial direction to form a two-section type structure; and the peripheral outer teeth at the middle part are located at abutted end parts of two sections. Compared with the prior art, the torsion bar disclosed by the invention does not pass through an end cover and is shorter in length, so that the torsion bar is not easy to bend and deform and the use process is safer and more stable. The torsion bar is divided into the two sections, so that different safety belt force limiting value requirements can be met through the combination of different diameters or materials. The invention further provides the safety belt coiling device using the torsion bar and a safety belt assembly.

Description

technical field [0001] The invention relates to safety belt technology, in particular to a torsion bar for a safety belt retractor. The invention also relates to a seat belt retractor and a seat belt assembly using the torsion bar. Background technique [0002] Seat belts are important passive safety components used in automobiles. When the vehicle collides, the seat belt can protect the user from or reduce secondary injuries during the collision. [0003] The standard three-point safety belt originally designed for use in car seats only includes a locking mechanism and webbing for securing the user (human body). When the vehicle collides, the locking mechanism is locked, and the webbing is no longer stretched outward, thereby binding the user to the car seat. However, due to the rapid change of speed at the moment of collision, the momentum change time caused by the speed change during collision is very short, so that the force of the webbing acting on the user is very l...

AI Technical Summary

Problems solved by technology

[0012] The present invention provides a torsion bar for a seat belt to solve the above-mentioned problems of the torsion bar of the existing seat belt retractor

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