GAS GENERATOR

• US 20130276662A1
• Filed: 01/04/2012
• Published: 10/24/2013
• Est. Priority Date: 01/07/2011
• Status: Abandoned Application

• Current Assignee: Nippon Kayaku Company Limited
• Original Assignee: Nippon Kayaku Company Limited
• Inventors: Ohsugi, Satoshi, Mukunoki, Hirotaka, Tanaka, Yusuke
• Application Number:
  US13/978,465
• Publication Number:
  US 20130276662A1
• Time in Patent Office: Days
• US Class Current: 102/530
• CPC Class Codes: B60R 2021/26011 using a filter through which the inflation gas passes
• CPC Class Codes: B60R 2021/26088 Plastic
• CPC Class Codes: B60R 2021/2648 comprising a plurality of combustion chambers or sub-chambers
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder
• CPC Class Codes: C06D 5/00 Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets explosive compositions containing an oxidizer, fuels for rocket engines intended for reaction with an oxidant other than air C06B

Abstract

A gas generator (1A) includes a housing including a lower shell (10) and an upper shell (20), an igniter (40), a gas generating agent (61), and a filter (70). The housing includes a bottom plate portion (11) to which the igniter (40) is assembled and a combustion chamber (60) accommodating the gas generating agent (61). The filter (70) is formed from a hollow cylindrical member and disposed in the housing so as to surround the combustion chamber (60) in a radial direction of the housing. The bottom plate portion (11) is provided with a positioning portion (38) formed from a resin-molded portion secured to the bottom plate portion (11), which is formed by adhering a fluid resin material to an inner surface and solidifying the same, and the positioning portion (38) abuts to an inner circumferential surface of an axial end portion of the filter (70) located on a side of the bottom plate portion (11).

Claims

1. A gas generator, comprising:

a short cylindrical housing which is constituted of a top plate portion (21) and a bottom plate portion (11) closing axial end portions and a circumferential wall portion (12, 22) provided with a gas discharge opening (23) and includes therein a combustion chamber (60) accommodating a gas generating agent (61);

an igniter (40) assembled to said bottom plate portion (11), for burning said gas generating agent (61);

a hollow cylindrical filter (70) disposed in said housing and surrounding said combustion chamber (60) in a radial direction of said housing,

said housing at least having a lower shell (10) including said bottom plate portion (11) and an upper shell (20) including said top plate portion (21); and

a positioning portion (38) formed from a resin-molded portion which is formed by attaching a fluid resin material to an inner surface of said lower shell (10) and solidifying the fluid resin material so that at least a part of the resin-molded portion is secured to said lower shell (10), for positioning said filter (70) in a radial direction by abutting to at least one of an inner circumferential surface and an outer circumferential surface of an axial end portion of said filter (70) located on a side of said bottom plate portion (11).

2. The gas generator according to claim 1, wherein

said positioning portion (38) has an annular shape abutting to said filter (70) along a circumferential direction of said filter (70).

3. The gas generator according to claim 1, wherein

a plurality of said positioning portions (38) are arranged as aligned along a circumferential direction of said filter (70).

4. The gas generator according to claim 1, wherein

said positioning portion (38) is located on said bottom plate portion (11) in a portion facing said combustion chamber (60) and abuts only to the inner circumferential surface of the axial end portion of said filter (70) located on the side of said bottom plate portion (11).

5. A gas generator, comprising:

a short cylindrical housing which is constituted of a top plate portion (21) and a bottom plate portion (11) closing axial end portions and a circumferential wall portion (12, 22) provided with a gas discharge opening (23) and includes therein a combustion chamber (60) accommodating a gas generating agent (61);

an igniter (40) assembled to said bottom plate portion (11), for burning said gas generating agent (61);

a hollow cylindrical filter (70) disposed in said housing and surrounding said combustion chamber (60) in a radial direction of said housing; and

a holding portion (30) provided on said bottom plate portion (11), for holding said igniter (40),

said housing at least having a lower shell (10) including said bottom plate portion (11) and an upper shell (20) including said top plate portion (21),

said lower shell (10) including a protruding cylindrical portion (17) provided to protrude toward said top plate portion (21) and an opening (15) provided at an axial end portion of said protruding cylindrical portion (17), which is located on a side of said top plate portion (21),

said holding portion (30) including a holding portion main body formed from a resin-molded portion which is formed by attaching a fluid resin material to said bottom plate portion (11) so as to at least reach a part of an outer surface of said bottom plate portion (11) from a part of an inner surface of said bottom plate portion (11) through said opening (15) and solidifying the fluid resin material so that at least a part of the resin-molded portion is secured to said bottom plate portion (11), for holding said igniter (40), an extended portion extending outward from said holding portion main body along the inner surface of said bottom plate portion (11), and a positioning portion (38) provided in said extended portion, for positioning said filter (70) in a radial direction by abutting to at least one of an inner circumferential surface and an outer circumferential surface of an axial end portion of said filter (70) located on a side of said bottom plate portion (11).

6. The gas generator according to claim 5, wherein

said extended portion is secured to said bottom plate portion (11).

7. The gas generator according to claim 5, wherein

said positioning portion (38) has an annular shape abutting to said filter (70) along a circumferential direction of said filter (70).

8. The gas generator according to claim 5, wherein

a plurality of said positioning portions (38) are arranged as aligned along a circumferential direction of said filter (70).

9. The gas generator according to claim 5, wherein

said positioning portion (38) is located on said bottom plate portion (11) in a portion facing said combustion chamber (60) and abuts only to the inner circumferential surface of the axial end portion of said filter (70) located on the side of said bottom plate portion (11).