Patent ID: 8714091
Filing Date: 2014-05-06
Classification: B60R,C06D

Abstract:
1. A gas generator, comprising: a housing including, a diffuser shell having a top plate and an upper circumferential wall plate provided with a gas discharge port, and a closure shell having a bottom plate and a lower circumferential wall plate, the diffuser shell and the closure shell forming an outer shell of the gas generator by joining and integrating the upper circumferential wall plate and the lower circumferential wall plate; an ignition device chamber provided within the outer shell and defined by a cup-shaped container disposed in a central part at the bottom plate of the closure shell, and accommodates an ignition device therein; a combustion chamber surrounding the ignition device chamber and charged with a gas generating agent; an annular filter disposed to face the top plate; a retainer supporting the annular filter and including, an annular bottom surface supporting at least a portion of a lower surface of the annular filter, and a cylindrical wall surface extending at least in an axial direction of the housing from an outer circumferential edge of the annular bottom surface, the cylindrical wall surface being fixed by being press-fitted directly or indirectly to a circumferential wall plate formed by the upper circumferential wall plate and the lower circumferential wall plate; a combustion gas passage formed to pass through from an outer circumferential surface of the filter to the gas discharge port; and the cup-shaped container being disposed such that a bottom surface thereof abutting against or being positioned close to the top plate of the diffuser shell, a circumferential wall thereof in the vicinity of the bottom surface abutting against or being positioned close to an inner circumferential surface of the annular filter, wherein, during an activation of the gas generator, when the top plate of the diffuser shell and the bottom plate of the closure shell deform in directions along an axis of the housing, the retainer and the annular filter move such that the annular filter is in gas-tight contact with the top plate of the diffuser shell, and a combustion gas passes through the combustion gas passage to be discharged from the gas discharge port after passing radially outward through the annular filter.