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Seat belt pretensioner and method for assembling a seat belt pretensioner

A technology of seat belts and tensioners, applied in the field of rotating tensioners and assembling such seat belt tensioners, can solve problems such as impact and achieve the effect of simplification of assembly

Active Publication Date: 2019-06-11
TRW AUTOMOTIVE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This can lead to unintended effects on the force limit

Method used

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  • Seat belt pretensioner and method for assembling a seat belt pretensioner
  • Seat belt pretensioner and method for assembling a seat belt pretensioner
  • Seat belt pretensioner and method for assembling a seat belt pretensioner

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Embodiment Construction

[0024] exist figure 1 and 2 A seatbelt pretensioner 10' for a prior art vehicle is shown in FIG. 2 , comprising an elongated, cylindrical pressure vessel 12' to which a gas generator 16' is connected via a channel 14'. Arranged in the pressure vessel 12' is a piston 18' mounted movably in the tensioning direction S' and a thrust mechanism 20' cooperating with a gear 22', here a push rod, which is in the tensioning direction S' It is arranged in front of the piston 18' and bears against it.

[0025] The longitudinal extension of the thrust mechanism 20' is longer than the distance of two teeth of the gear 22'. The thrust mechanism 20' is made of a relatively soft material so that the teeth of the gear 22' can press into the thrust mechanism 20' as the thrust mechanism moves over the gear 22'.

[0026] On the front end of the pressure vessel 12 ′ in the tensioning direction S′, a stop 24 ′ is provided, which limits the movement of the piston 18 ′ in the tensioning direction S...

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Abstract

In a belt tensioner (10) for a seat belt comprising an elongate pressure reservoir (12), a piston (18) movably supported in the pressure reservoir (12) in the longitudinal direction to which piston pressurized fluid can be applied and which in this way can be moved in a tensioning direction (S), a mechanical thrust means (20) interacting with the piston, the thrust means interacting with a gearwheel (22) and driving the same in the case of restraint, and comprising a stop (24) on which the piston (18) abuts in the tensioning direction in a final position, it is provided that between the piston (18) and the thrust means (20) a spacer (30) in the form of a separate member is provided which is dimensioned such that in the final position of the piston (18) the thrust means (20) is urged past the stop (24) by said spacer. Furthermore there is provided a method of mounting a belt tensioner of this type.

Description

technical field [0001] The invention relates to a belt tensioner, in particular a swivel tensioner, for a seat belt, comprising: an elongated, preferably cylindrical pressure vessel; a piston, which can be loaded with a fluid under pressure and is thus movable in the tensioning direction; a mechanical thrust mechanism cooperating with the piston, which co-operates with and drives the gear in the constrained situation And the longitudinal extension of the thrust mechanism is greater than the distance of two teeth of the gear; and a stop provided on the inner side of the pressure vessel, the piston in the final position after activation of the seat belt tensioner in the tensioning direction Against the stop, the piston seals off the pressure vessel in the end position. The invention also relates to a method for assembling such a belt pretensioner. Background technique [0002] Seat belt tensioners comprising a gas generator are known from the prior art and have a pressure ve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60R22/46
CPCB60R22/4633B60R2022/4642B60R2022/468
Inventor T·莫丁格M·努丁A·普雷吉策B·根特纳
Owner TRW AUTOMOTIVE GMBH
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