GAS GENERATOR AND ASSEMBLING METHOD THEREOF

• US 20140096697A1
• Filed: 10/03/2013
• Published: 04/10/2014
• Est. Priority Date: 10/04/2012
• Status: Abandoned Application

• Current Assignee: Daicel Corporation
• Original Assignee: Daicel Corporation
• Inventors: OKUYAMA, Takashi
• Application Number:
  US14/045,623
• Publication Number:
  US 20140096697A1
• Time in Patent Office: Days
• US Class Current: 102/530
• CPC Class Codes: B60R 2021/26029 Ignitors
• CPC Class Codes: B60R 2021/26076 characterised by casing
• CPC Class Codes: B60R 2021/2648 comprising a plurality of combustion chambers or sub-chambers
• CPC Class Codes: B60R 21/264 using instantaneous generation of gas, e.g. pyrotechnic B60R21/268 takes precedence
• 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
• CPC Class Codes: F42B 3/04 for producing gas under pressure generators of inflation fluid especially adapted for vehicle air bags B60R21/26
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

The present invention provides a gas generator, including:

• • a housing with a gas discharge port;
  • an igniter assembly and a gas generating agent in the housing; and
  • a metallic cup of constant inner diameter covering the igniter to define a charging chamber. The igniter assembly includes a main body, including an ignition portion and a electro-conductive pin integrated with a metallic collar by a resin. The metallic collar has a fixing portion inserted into a hole in a bottom surface of the housing and a remaining portion projecting inward from the bottom surface of the housing, and a guide portion. An inner circumferential wall surface of the metallic cup and an outer circumferential wall surface of the fixing portion are press-fitted, and an annular gap is formed between the inner circumferential wall of the metallic cup member and an outer circumferential wall surface of the guide portion.

Claims

1. A gas generator, comprising:

a housing provided with a gas discharge port;

an igniter assembly and a gas generating agent accommodated in the housing;

a metallic cup member having a constant inner diameter and covering the igniter assembly to define a charging chamber for charging the gas generating agent;

in the igniter assembly,

an igniter main body, which includes an ignition portion and a electro-conductive pin, being integrated with a metallic collar by a resin;

the metallic collar having,

a fixing portion including a portion inserted into a hole in a bottom surface of the housing and a remaining portion projecting to an inner side of the bottom surface of the housing, and

a guide portion formed axially in connection with the fixing portion between the fixing portion and the resin axially in connection with the fixing portion,

the guide portion having an inclined surface in which an outer diameter (D3) of a first portion in contact with the fixing portion is a maximum diameter and an outer diameter (D4) of a second portion on the axially opposite side to the first portion is a minimum diameter;

the metallic cup member and the metallic collar satisfying

D1=D3, where (D1) is an outer diameter of the fixing portion,

D1=D3≦

R1, where (R1) is an inner diameter of the metallic cup member, and

R1>

D4; and

the metallic cup member being fixed in a state in which an inner circumferential wall surface of the metallic cup member and an outer circumferential wall surface of the fixing portion are press-fitted, and an annular gap is formed between the inner circumferential wall surface of the metallic cup member and an outer circumferential wall surface of the guide portion.

6. The gas generator according to claim 1, wherein the metallic cup member is made from stainless steel, and the metallic collar is made from aluminum.

7. A method for assembling the gas generator according to claim 1, comprising a step of fitting and fixing the metallic cup member to the igniter assembly that is fixed to the bottom surface of the housing, wherein,

the fitting and fixing step further includes,

aligning a central axis of the metallic cup member and a central axis of the igniter assembly when the metallic cup member is fitted to the igniter assembly from a side of the ignition portion thereof,

inserting and fixing an opening of the metallic cup member to the fixing portion through the guide portion, and correcting a displacement of the central axis of the metallic cup member and a central axis of the igniter assembly while inserting the opening of the metallic cup member through the guide portion, when the central axis of the metallic cup member and the central axis of the igniter assembly are displaced with respect to each other.

2. A gas generator, comprising:

a housing provided with a gas discharge port;

an igniter assembly and a gas generating agent accommodated in the housing;

a metallic cup member having a constant inner diameter and covering the igniter assembly to define a charging chamber for charging the gas generating agent;

in the igniter assembly,

an igniter main body, which includes an ignition portion and a electro-conductive pin, being integrated with a metallic collar by a resin;

the metallic collar having,

a fixing portion including a portion inserted into a hole in a bottom surface of the housing and a remaining portion projecting to an inner side of the bottom surface of the housing, and

a guide portion formed axially in contact with the fixing portion;

the metallic cup member and the metallic collar satisfying

D1>

D2, where (D1) is an outer diameter of the fixing portion and (D2) is an outer diameter of the guide portion,

D1≦

R1, where (R1) is an inner diameter of the metallic cup member, and

R1>

D2; and

the metallic cup member being fixed in a state in which an inner circumferential wall surface of the metallic cup member and an outer circumferential wall surface of the fixing portion are press-fitted, and an annular gap is formed between the inner circumferential wall surface of the metallic cup member and an outer circumferential wall surface of the guide portion.

8. The gas generator according to claim 2, wherein the metallic cup member is made from stainless steel, and the metallic collar is made from aluminum.

9. A method for assembling the gas generator according to claim 2, comprising a step of fitting and fixing the metallic cup member to the igniter assembly that is fixed to the bottom surface of the housing, wherein,

the fitting and fixing step further includes,

aligning a central axis of the metallic cup member and a central axis of the igniter assembly when the metallic cup member is fitted to the igniter assembly from a side of the ignition portion thereof,

inserting and fixing an opening of the metallic cup member to the fixing portion through the guide portion, and correcting a displacement of the central axis of the metallic cup member and a central axis of the igniter assembly while inserting the opening of the metallic cup member through the guide portion, when the central axis of the metallic cup member and the central axis of the igniter assembly are displaced with respect to each other.

3. A gas generator, comprising:

a housing provided with a gas discharge port;

an igniter assembly and a gas generating agent accommodated in the housing;

a metallic cup member having a constant inner diameter and covering the igniter assembly to define a charging chamber for charging the gas generating agent;

in the igniter assembly,

an igniter main body, which includes an ignition portion and a electro-conductive pin, being integrated with a metallic collar by a resin;

the metallic collar having,

a fixing portion including a portion inserted into a hole in a bottom surface of the housing and a first remaining portion projecting and exposed to an inner side of the bottom surface of the housing, and

a guide portion formed by the resin enclosing a second remaining portion except for the first remaining portion of the metallic collar;

the metallic cup member and the metallic collar satisfying

D1=D5, where (D1) is an outer diameter of the fixing portion and (D5) is an outer diameter of the guide portion, and

D1=D5≧

R1, where (R1) is an inner diameter of the metallic cup; and

the metallic cup member being fixed in a state in which an inner circumferential wall surface of the metallic cup member and an outer circumferential wall surface of the fixing portion are press-fitted, and the inner circumferential wall surface of the metallic cup member and an outer circumferential wall surface of the guide portion are abutted against each other.

10. The gas generator according to claim 3, wherein the metallic cup member is made from stainless steel, and the metallic collar is made from aluminum.

11. A method for assembling the gas generator according to claim 3, comprising a step of fitting and fixing the metallic cup member to the igniter assembly that is fixed to the bottom surface of the housing, wherein,

the fitting and fixing step further includes,

aligning a central axis of the metallic cup member and a central axis of the igniter assembly when the metallic cup member is fitted to the igniter assembly from a side of the ignition portion thereof,

inserting and fixing an opening of the metallic cup member to the fixing portion through the guide portion, and correcting a displacement of the central axis of the metallic cup member and a central axis of the igniter assembly while inserting the opening of the metallic cup member through the guide portion, when the central axis of the metallic cup member and the central axis of the igniter assembly are displaced with respect to each other.

4. A gas generator comprising:

a housing provided with a gas discharge port;

an igniter assembly and a gas generating agent accommodated in the housing;

a metallic cup member having a constant inner diameter and covering the igniter assembly to define a charging chamber for charging the gas generating agent;

in the igniter assembly,

an igniter main body, which includes an ignition portion and a electro-conductive pin, being integrated with a metallic collar by a resin;

the metallic collar having,

a fixing portion including a portion inserted into a hole in a bottom surface of the housing and a first remaining portion projecting and exposed to an inner side of the bottom surface of the housing, and

a guide portion formed by the resin enclosing a second remaining portion except for the first remaining portion of the metallic collar;

the guide portion including a cylindrical portion and a plurality of protruding portions protruding radially from an outer circumferential surface of the cylindrical portion;

the metallic cup member and the metallic collar satisfying

D1=D8, where (D1) is an outer diameter of the fixing portion and (D8) is an outer diameter of an imaginary circle defined by connecting tips of the protruding portions of the guide portion,

D1=D8≦

R1, where (R1) is an inner diameter of the metallic cup member; and

the metallic cup member being fixed in a state in which an inner circumferential wall surface of the metallic cup member and an outer circumferential wall surface of the fixing portion are press-fitted, and the inner circumferential wall surface of the metallic cup member and an outer circumferential wall surface of the protruding portions of the guide portion are abutted against each other.

12. The gas generator according to claim 4, wherein the metallic cup member is made from stainless steel, and the metallic collar is made from aluminum.

13. A method for assembling the gas generator according to claim 4, comprising a step of fitting and fixing the metallic cup member to the igniter assembly that is fixed to the bottom surface of the housing, wherein,

the fitting and fixing step further includes,

aligning a central axis of the metallic cup member and a central axis of the igniter assembly when the metallic cup member is fitted to the igniter assembly from a side of the ignition portion thereof,

inserting and fixing an opening of the metallic cup member to the fixing portion through the guide portion, and correcting a displacement of the central axis of the metallic cup member and a central axis of the igniter assembly while inserting the opening of the metallic cup member through the guide portion, when the central axis of the metallic cup member and the central axis of the igniter assembly are displaced with respect to each other.

5. A gas generator, comprising:

a housing provided with a gas discharge port;

an igniter assembly and a gas generating agent accommodated in the housing;

a metallic cup member having a constant inner diameter and covering the igniter assembly to define a charging chamber for charging the gas generating agent;

in the igniter assembly,

an igniter main body, which includes an ignition portion and a electro-conductive pin, being integrated with a metallic collar by a resin;

the metallic collar having,

a fixing portion including a portion inserted into a hole in a bottom surface of the housing and a first remaining portion projecting and exposed to an inner side of the bottom surface of the housing, and

a guide portion formed by the resin enclosing a second remaining portion except for the first remaining portion of the metallic collar;

the guide portion including a second guide portion formed axially in contact with the fixing portion, and a first guide portion formed axially in contact with the second guide portion;

the metallic cup member and the metallic collar satisfying

D1=D6, where (D1) is an outer diameter of the fixing portion and (D6) is an outer diameter of the first guide portion,

D1>

D7, where (D7) is an outer diameter of the second guide portion,

D1=D6≦

R1, where (R1) is an inner diameter of the metallic cup, and

R1>

D7; and

the metallic cup member being fixed in a state in which an inner circumferential wall surface of the metallic cup member and an outer circumferential wall surface of the fixing portion are press-fitted, an annular gap is formed between the inner circumferential wall surface of the metallic cup member and an outer circumferential wall surface of the second guide portion, and the inner circumferential wall surface of the metallic cup member and an outer circumferential wall surface of the first guide portion are abutted against each other.

14. The gas generator according to claim 5, wherein the metallic cup member is made from stainless steel, and the metallic collar is made from aluminum.

15. A method for assembling the gas generator according to claim 5, comprising a step of fitting and fixing the metallic cup member to the igniter assembly that is fixed to the bottom surface of the housing, wherein,

the fitting and fixing step further includes,

aligning a central axis of the metallic cup member and a central axis of the igniter assembly when the metallic cup member is fitted to the igniter assembly from a side of the ignition portion thereof,

inserting and fixing an opening of the metallic cup member to the fixing portion through the guide portion, and correcting a displacement of the central axis of the metallic cup member and a central axis of the igniter assembly while inserting the opening of the metallic cup member through the guide portion, when the central axis of the metallic cup member and the central axis of the igniter assembly are displaced with respect to each other.