Patent ID: 7845679
Filing Date: 2010-12-07
Classification: B60R

Abstract:
1. A gas generator for a motor vehicle safety device, the generator comprising: a first chamber for combustion containing a pyrotechnic initiator and a pyrotechnic charge to be triggered by the initiator; and a second chamber for diffusion into which a gas that results from combustion of the charge is transferred prior to being exhausted from the gas generator, the first and second chambers being separated from each other by a nozzle partition having at least one communication orifice, the second chamber having a piston for closing and opening the orifice as a function of the gas pressure in the combustion chamber, the piston being urged to a position for closing the orifice by a mass of elastically deformable material, the mass having a stiffness that decreases with increasing temperature so that a clearance is created between the piston and the orifice that increases if the pressure within the first chamber rises and decreases if the pressure within the first chamber decreases; wherein the mass is non-metallic.