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Vehicle safety belt, pyrotechnic safety belt pretensioner and flexible strip-shaped drive element

A technology of seat belt pretensioner and driving element, applied in the field of vehicle seat belts, can solve the problems of broken teeth of a driven gear, abnormal operation of the pretensioner, etc., and achieves improved meshing force, improved temperature stability, and material locking. The effect of a solid connection

Inactive Publication Date: 2018-02-13
TRW AUTOMOTIVE TECH (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the steel ball pretensioner, the steel ball and the teeth of the driven gear bear a significant instantaneous load when they hit, so on the one hand, the materials of the steel ball and the driven gear need to meet high requirements, on the other hand, the driven gear The teeth may break on impact, causing the pretensioner to malfunction

Method used

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  • Vehicle safety belt, pyrotechnic safety belt pretensioner and flexible strip-shaped drive element
  • Vehicle safety belt, pyrotechnic safety belt pretensioner and flexible strip-shaped drive element
  • Vehicle safety belt, pyrotechnic safety belt pretensioner and flexible strip-shaped drive element

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Embodiment Construction

[0037] figure 1 is a schematic sectional view of a pyrotechnic seat belt pretensioner according to the invention, which comprises a pyrotechnic device 10 , a tubular housing 11 , a flexible strip-shaped drive element 12 and an output element 13 . The pyrotechnic device 10 is mounted on one end of a tubular casing 11 and is used to drive a flexible drive element 12 when triggered so that the drive element 12 moves guidedly in the tubular casing and moves through the void. Said tubular housing 11 is meandering after the stroke and engages a driven element 13 which is kinematically coupled to the belt reel. The pyrotechnic device, for example, can be triggered according to the collision signal detected by the collision sensor, so that the gunpowder contained in the pyrotechnic device is ignited and burns rapidly, and the combustion force generated thereby pushes the flexible driving element 12, so that the driving element 12 is winding in a meandering direction. It moves guidedl...

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Abstract

The invention relates to a vehicle safety belt, a pyrotechnic safety belt pretensioner and a flexible strip-shaped drive element. The drive element (12) comprises a piston and a flexible strip-shapedmain body, the piston is formed at the first end, facing a pyrotechnic device (10), of the main body, the piston is in interference fit with a tubulous shell (11), and the main body is in clearance fit with the tubulous shell (11). The main body comprises a flexible strip-shaped metallic framework and a plastic body which is arranged on one side of the metallic framework and connected with the metallic framework in a locked mode, the metallic framework is provided with notches which are arranged in rows in the longitudinal direction at intervals and located in the middle in the transverse direction, concave parts facing inwards in the radial direction are formed in at least one part of the notches, and therefore teeth which are arranged in rows in the longitudinal direction at intervals and located in the middle in the transverse direction are formed.

Description

technical field [0001] The invention relates to a vehicle seat belt, a pyrotechnic seat belt pretensioner and a flexible strip-shaped drive element. Background technique [0002] Vehicle seat belts are an important part of vehicle occupant restraint systems, especially to provide protection for vehicle occupants in traffic accidents, to prevent occupants from being injured or to minimize injuries. More and more seat belts are equipped with pretensioners and force limiters. Among them, the pretensioner has a pretension function. In a traffic accident such as a collision, the webbing is pretensioned before the occupant moves forward to strengthen the occupant's protection. binding force to provide effective protection to the occupants. The force limiter has a force limiting function to avoid the webbing exerting too much force on the occupant in a traffic accident such as a collision and thus causing injury. [0003] A rack-type pretensioner for seat belts is known from the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R22/46
CPCB60R22/4628
Inventor 韩勇
Owner TRW AUTOMOTIVE TECH (SHANGHAI) CO LTD
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