Gas generator and method for manufacturing the same

Abstract

A gas generator that eliminates work for welding-fixing a holder to a housing and subjecting the holder to an excess processing, which can be easily manufactured at low cost, and a method for manufacturing the gas generator. The gas generator includes an approximately short cylindrical housing including a bottomed member and a lid member, gas generants arranged in the housing to generate a high-temperature gas by combustion, a filter arranged in an inner circumference part of the housing so as to surround the gas generants in a diameter direction of the housing, an igniter energized from the outside to ignite, and a holder to which the igniter is fixed and that is fixed to the bottomed member so that the igniter is arranged coaxially with the housing. At least one of the holder and the bottomed member is clamped, and pressed and deformed in an axial direction of a hole so that the holder is fixed to the bottomed member.

1 . A method for manufacturing a gas generator which has a short cylindrical external shape, comprising:
 fitting and fixing a holder configured to fix an igniter into a housing configured to contain gas generants therein, the housing including a bottomed member provided with a hole on the bottom, wherein   the step of fitting and fixing includes a step of clamping and pressurization-deforming at least one of the holder or the bottomed member in the direction of a center axis of the hole, thus achieving airtightness in a fixed contact part between the holder and the bottomed member.   
     
     
         2 . The method for manufacturing a gas generator as set forth in  claim 1 , wherein the holder includes a first material and the bottomed member includes a second material, a tensile strength of the first material is different from a tensile strength of the second material, and one that includes the material with a lower tensile strength is deformed. 
     
     
         3 . A method for manufacturing a gas generator with a short cylindrical external shape, comprising:
 providing a housing configured to contain gas generants therein, the housing including a bottomed member provided with a hole;   placing a holder configured to fix an igniter in the hole; and   clamping and pressurization-deforming at least one of the bottomed member or the holder in a radial direction of the hole with a first metal fitting and a second metal fitting, the bottomed member, the holder, the first metal fitting, and the second metal fitting being coaxially arranged,   wherein a contact part between the bottomed member and the holder is airtight after clamping and pressurization-deforming at least one of the bottomed member or the holder.   
     
     
         4 . The method for manufacturing a gas generator as set forth in  claim 3 , wherein the bottomed member is deformed in a diameter reduction direction. 
     
     
         5 . The method for manufacturing a gas generator as set forth in  claim 3 , wherein the holder is deformed in a diameter expansion direction.