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Activated-stroke actuator, in particular for an automobile safety system for the protection of pedestrians

An actuation device and stroke technology, applied in pyrotechnic actuation devices, fluid pressure actuation devices, pedestrian/occupant safety arrangements, etc.

Inactive Publication Date: 2010-08-04
海瑞克里兹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there may be situations where the aforementioned safety system is triggered and thus raises the bonnet in the absence of an accident, for example in the case of a false detection or if the pedestrian does not hit the bonnet

Method used

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  • Activated-stroke actuator, in particular for an automobile safety system for the protection of pedestrians
  • Activated-stroke actuator, in particular for an automobile safety system for the protection of pedestrians
  • Activated-stroke actuator, in particular for an automobile safety system for the protection of pedestrians

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Embodiment Construction

[0023] figure 1 The illustrated trigger stroke actuation device 11 includes a substantially cylindrical body 13 which houses a piston 15 connected to a connecting rod 17 axially protruding at one end of the body. The main body also houses a component that pushes the piston in response to a trigger command. In the example described, these components are constituted by a gas generator 19 with ignition trigger mounted opposite the piston in the main body. The gas generator is folded at the end of the main body opposite to the axially protruding link 17. Therefore, a gas expansion chamber 21 is formed between the gas generator and the opposite end of the piston.

[0024] As described above, the connecting rod 17 can be connected to a mechanism that raises the hood of the car in the case of a frontal collision of the car with a pedestrian.

[0025] In addition, the main body 13 accommodates a reset-brake structure 25 with an inertial trigger threshold, which enables to brake or even p...

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PUM

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Abstract

Pyrotechnic actuator, in particular for lifting the bonnet of an automobile in the event of a collision with a pedestrian. The actuator comprises a return-braking arrangement (25) acting between the rod (17) and the body (13) of the actuator and having an inertial actuating threshold in order to brake the rod in return only if it is subjected to a force under a sufficient acceleration truly representative of a collision.

Description

Technical field [0001] The invention relates to a trigger stroke actuation device, which is especially integrated in a safety system for protecting pedestrians in the event of a frontal collision with a motor vehicle. More specifically, the present invention relates to an improvement of an actuating device capable of resetting the safety system to its initial position when circumstances permit, particularly after false detection or triggering while avoiding obstacles. Background technique [0002] Patent FR2 878 212 describes a safety system for protecting pedestrians when they are hit by a motor vehicle. The system includes a mechanism that can quickly raise the hood of a motor vehicle in the event of a collision. Specifically, in the event of a collision, the head of the pedestrian often hits the hood of the vehicle. This impact of the head against the engine cover deforms the engine cover. When the deformation exceeds a certain level, the engine cover will contact the engin...

Claims

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Application Information

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IPC IPC(8): F15B15/19F15B15/22F15B15/26B60R21/34B60R21/38
CPCF15B15/22F15B15/1476B60R21/38F15B15/204F15B15/262F15B15/19
Inventor 埃里克·拉斯贝萨让-保罗·纳多埃夫拉尔·博格
Owner 海瑞克里兹
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