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Gas generator

  • US 10,086,791 B2
  • Filed: 08/04/2015
  • Issued: 10/02/2018
  • Est. Priority Date: 09/16/2014
  • Status: Active Grant
First Claim
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1. A gas generator comprisinga housing which has a top plate, a circumferential wall and a bottom plate,a first combustion chamber, an ignition device chamber and a second combustion chamber which are formed separately from each other inside a housing,the first combustion chamber being a space excluding the ignition device chamber and the second combustion chamber inside the housing and having a first gas generating agent accommodated therein, the first gas generating agent being ignited and burnt by a combustion product generated by combustion of an ignition agent in the ignition device chamber,the ignition device chamber havingan ignition device chamber cup forming the ignition device chamber and a first ignition device including a first igniter,the first igniter including a first igniter main body portion and a first collar which is made of a metal and circumferentially encloses the first igniter main body portion,the first collar including a first columnar main body portion, a first plate portion, which extends in a radial direction of the housing from part of a circumferential surface of the first columnar main body portion, and a first wall surface which is formed by extending part of the first plate portion in an axial direction of the housing,an opening of the ignition device chamber cup being fitted to the first columnar main body portion of the first collar of the first igniter,the second combustion chamber havinga second ignition device including a second igniter, and a second gas generating agent which are accommodated inside a second combustion chamber cup,the second igniter including a second igniter main body portion and a second collar which is made of a metal and circumferentially encloses the second igniter main body portion,the second collar including a second columnar main body portion, a second plate portion, which extends in a radial direction from part of a circumferential surface of the second columnar main body portion, and a second wall surface which is formed by extending part of the second plate portion in the axial direction of the housing,an opening of the second combustion chamber cup being fitted to the second columnar main body portion of the second collar of the second igniter,in the first igniter and the second igniter,a bottom side of the first columnar main body portion of the first collar being fitted in a first hole to fix the first igniter, the first hole being one of two holes formed in the bottom plate of the housing separately from each other in the radial direction of the housing,a bottom side of the second columnar main body portion of the second collar being fitted in a second hole to fix the second igniter, the second hole being the other one of the two holes formed in the bottom plate of the housing separately from each other in the radial direction of the housing,the first wall surface of the first collar and the second wall surface of the second collar being arranged to face each other in a radial direction,when a pressure inside the housing rises at a time of actuation, the first wall surface of the first igniter and the second wall surface of the second igniter being in contact with each other in a state of being pushed radially inward against each other.

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