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Gas generator

  • US 10,676,061 B2
  • Filed: 02/09/2017
  • Issued: 06/09/2020
  • Est. Priority Date: 02/10/2016
  • Status: Active Grant
First Claim
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1. A gas generator, comprising:

  • a cylindrical housing including a top plate portion and a bottom plate portion closing axial end portions and a circumferential wall portion provided with a gas discharge opening and containing a combustion chamber accommodating a gas generating agent;

    an igniter charged with an ignition agent for burning the gas generating agent;

    a fixing portion fixing the igniter to the bottom plate portion,the bottom plate portion being provided with an opening,the igniter including an ignition portion defining an ignition chamber accommodating the ignition agent and a terminal pin connected to the ignition portion for igniting the ignition agent and arranged to pass through the opening,the fixing portion being formed from a resin molding provided to close the opening and to fill a space between the igniter and the bottom plate portion,the resin molding including an annular wall portion surrounding an outer circumferential surface of the ignition portion, andthe annular wall portion having a lower cover portion provided, which is continuous in a circumferential direction on a side of the bottom plate portion so as to cover the outer circumferential surface of the ignition portion and which is secured to the outer circumferential surface of the ignition portion, and an upper enclosing portion provided on a side of the top plate portion at a distance from the outer circumferential surface of the ignition portion; and

    an externally attached component externally attached to the annular wall portion,wherein an inner circumferential surface of the externally attached component and an outer circumferential surface of the annular wall portion are in press contact with each other,wherein the externally attached component is a cup-shaped member, which accommodates an enhancer agent arranged to face the ignition portion,wherein the cup-shaped member is made from a member low in mechanical strength that bursts or melts as the enhancer agent burns,wherein the annular wall portion is tapered toward the top plate portion, andwherein the inner circumferential surface of the cup-shaped member covers and is in press contact with all of the outer circumferential surface of the annular wall portion at the upper enclosing portion of the annular wall portion.

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