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Triggered-stroke actuator provided with a gas discharge device

A technology for gas generators and actuators, applied in fluid pressure actuators, pyrotechnic actuators, transportation and packaging, etc., can solve the problems of high cost and difficult implementation of leakage ports, and achieve cheap and easy manufacturing , easily reproducible effect

Inactive Publication Date: 2013-05-29
海瑞克里兹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such leakage ports are difficult and costly to implement and are only used when the rod of the piston is detached from the piston, as in the examples of the above documents

Method used

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  • Triggered-stroke actuator provided with a gas discharge device
  • Triggered-stroke actuator provided with a gas discharge device
  • Triggered-stroke actuator provided with a gas discharge device

Examples

Experimental program
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Effect test

no. 3 example

[0087] According to this third embodiment, and as in the previous embodiments, the groove 230 formed at the periphery of the piston 14 is intended to receive the sealing joint 40 . In the example considered in the figures, the groove 230 has a bottom 232 and two side walls 234a and 234b.

[0088] like Figure 13 As shown, the recess 230 houses within it elements for forming a protrusion 280 which locally reduces the cross-section available within this recess for sealing the joint 40 .

[0089] The size of the additional element, especially its width l3 (see Figure 15 ) is chosen such that the compressibility of the joint 40 is only changed locally.

[0090] In this example, the additional element 280 is a strip folded into a U-shape to fit the shape of the groove 230 and to be able to be located in the groove 230 under the sealing joint 40 so that the base 282 of the U-shape rests against the groove. The bottom 232 of the groove 230 , and its wings 284 a and 284 b lean aga...

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Abstract

The invention relates to a triggered-stroke actuator (10) comprising a body (12) which houses a piston (14) and a rod (16), and a gas generator (18) mounted in said body (12) opposite said piston (14) and designed to pressurize a first chamber (20) defined between said gas generator and said piston, wherein the piston (14) has, on its outer surface, a groove (30) in which there is housed a seal (40) which provides sealing with the body (12) of the actuator (10). A calibrated passage (50), which is designed to discharge gas out of the first chamber (20), is formed between the seal (40) and the wall of the groove (30).

Description

technical field [0001] The present invention relates to a trigger stroke actuator. [0002] The trigger stroke actuator according to the invention is particularly suitable for use in safety systems intended to be equipped with vehicles and whose function is to quickly lift the vehicle's bonnet in the event of a collision with a pedestrian. Background technique [0003] Patent FR2 878 212 describes a safety system for protecting pedestrians when they are struck by a vehicle. The system includes a mechanism for rapidly raising the hood of the vehicle in the event of a crash. In fact, when such a collision occurs, the pedestrian's head will often strike the vehicle's hood. Such impact of the head against the bonnet deforms the bonnet. Except for some deformation, the engine cover is in contact with the engine block and all rigid parts surrounding the engine. This is where the pedestrian's head experiences the strongest deceleration, which can cause serious injury. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R21/38F15B15/14F15B15/19
CPCB60R21/38F15B15/1452F15B15/19B62D25/10
Inventor 弗雷德里克·马林让-保罗·纳多
Owner 海瑞克里兹