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Gas generator

  • US 10,442,389 B2
  • Filed: 01/13/2017
  • Issued: 10/15/2019
  • Est. Priority Date: 01/26/2016
  • Status: Active Grant
First Claim
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1. A gas generator comprisinga housing having a top plate, a bottom plate and a circumferential wall between the top plate and the bottom plate, a portion of the bottom plate having an opening, the bottom plate further having a cylindrical wall extending from the opening in a direction toward the top plate, and the circumferential wall being provided with gas discharge ports,in the housing,a cylindrical filter being disposed to be spaced apart from the gas discharge ports of the circumferential wall of the housing and having an upper end surface abutted against the top plate and a lower end surface abutted against the bottom plate,an ignition device chamber being formed inside a cup-shaped ignition device chamber housing fitted to the cylindrical wall of the bottom plate of the housing from the outside, and accommodating an ignition device including an igniter,a combustion chamber being located radially between the cylindrical filter and the cup-shaped ignition device chamber housing and being charged with a gas generating agent,the cup-shaped ignition device chamber housing having a flange at an opening thereof, being fitted to the cylindrical wall of the bottom plate of the housing such that the flange is abutted against the bottom plate, and being slidable in a direction toward the top plate,an annular retainer being disposed between the cylindrical filter and the cup-shaped ignition device chamber housing,the annular retainer having an annular base portion and an annular wall extending from an outer circumferential edge of the annular base portion toward the top plate, andin the annular retainer, the annular wall being abutted against an inner circumferential surface of the cylindrical filter, the annular base portion being abutted against the bottom plate of the housing, and the annular base portion and the flange of the cup-shaped ignition device chamber housing not being overlapped in a thickness direction.

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