Gas generating system

• US 20070108751A1
• Filed: 11/16/2006
• Published: 05/17/2007
• Est. Priority Date: 11/16/2005
• Status: Active Grant

• Current Assignee: TK Holdings Incorporated (Ningbo Junsheng Investment Group Co., Ltd.)
• Original Assignee: TK Holdings Incorporated (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Mayville, Brian, Stedz, Christopher
• Granted Patent: US 7,802,812 B2
• Time in Patent Office: Days
• US Class Current: 280/741
• CPC Class Codes: B60R 2021/26011 using a filter through which the inflation gas passes
• CPC Class Codes: B60R 21/26 characterised by the inflation fluid source or means to control inflation fluid flow arrangement or mounting thereof to the vehicle B60R21/20; blasting cartridges for producing gas under pressure in general F42B3/04; initiators or igniters therefor F42B3/10
• CPC Class Codes: B60R 21/261 with means other than bag structure to diffuse or guide inflation fluid

Abstract

A gas generating system (10) includes a housing (12), a first end closure (22) secured to the housing (12) for hermetically sealing a first end portion of the housing, and a first bore seal (26) formed separately from the first end closure (22) and secured to the first end closure (22) for mounting a first gas generant combustion initiation mechanism (24) therein. The gas generator (10) may include single-stage and/or dual-stage capability.

Claims

1. A gas generating system comprising:

a housing;

a first end closure secured to the housing for hermetically sealing a first end portion of the housing; and

a first bore seal formed separately from the first end closure and secured to the first end closure for mounting a first gas generant combustion initiation mechanism therein.

2. The gas generating system of claim 1 wherein the first end closure is secured to the housing by hot-forming at least one of the first end closure and the housing and shaping the at least one of the first end closure and the housing to sealingly engage a portion of the other one of the first end closure and the housing.

3. The gas generating system of claim 2 further comprising a second end closure secured to the housing for hermetically sealing a second end portion of the housing, and a second bore seal formed separately from the second end closure and secured to the second end closure for mounting a second gas generant combustion initiation mechanism therein, and wherein the second end closure is secured to the housing by hot-forming at least one of the second end closure and the housing and shaping the at least one of the second end closure and the housing to sealingly engage a portion of the other one of the second end closure and the housing.

4. The gas generating system of claim 1 wherein the first end closure is secured to the housing by welding.

5. The gas generating system of claim 4 further comprising a second end closure secured to the housing for hermetically sealing a second end portion of the housing, and a second bore seal formed separately from the second end closure and secured to the second end closure for mounting a second gas generant combustion initiation mechanism therein, and wherein the second end closure is secured to the housing by welding.

6. The gas generating system of claim 1 wherein the first end closure is secured to the housing by forcing a portion of the housing to cold-flow against a portion of the first end closure to form a metal-to-metal seal therebetween.

7. The gas generating system of claim 6 further comprising a second end closure secured to the housing for hermetically sealing a second end portion of the housing, and a second bore seal formed separately from the second end closure and secured to the second end closure for mounting a second gas generant combustion initiation mechanism therein, and wherein the second end closure is secured to the housing by forcing a portion of the housing to cold-flow into a portion of the second end closure to form a metal-to-metal seal therebetween.

8. The gas generating system of claim 1 wherein the first bore seal is welded to the first end closure to provide a hermetic seal therebetween.

9. The gas generating system of claim 1 further comprising:

a second end closure secured to the housing for hermetically sealing a second end portion of the housing; and

a second bore seal formed separately from the second end closure and secured to the second end closure for mounting a second gas generant combustion initiation mechanism therein.

10. The gas generating system of claim 9 wherein an interior of the housing is divided into a first chamber and a second chamber, the first gas generant combustion initiation mechanism is positioned so as to initiate combustion of a first quantity of gas generant positioned within the first chamber upon activation of the first gas generant combustion initiation mechanism, and the second gas generant combustion initiation mechanism is positioned so as to initiate combustion of a second quantity of gas generant positioned within the second chamber upon activation of the second gas generant combustion initiation mechanism.

11. The gas generating system of claim 10 wherein the first quantity of gas generant has substantially the same composition as the second quantity of gas generant.

12. The gas generating system of claim 1 wherein the housing is deep-drawn to provide a closed end thereof.

13. The gas generating system of claim 1 wherein an end portion of the housing is hot-formed to close the end portion.

14. The gas generating system of claim 1 wherein the housing has an outer diameter of approximately 41.3 mm diameter.

17. The gas generating system of claim 1 wherein the gas generating system is fittable longitudinally within a cylindrical size envelope having a diameter of approximately 41.3 mm.

18. The gas generating system of claim 1 wherein the gas generating system has an overall system diameter of approximately 41.3 mm.

19. The gas generating system of claim 1 further comprising a smokeless gas generant composition positioned in the interior of the gas generating system.

15. A vehicle occupant protection system comprising a gas generating system including a housing, a first end closure secured to the housing for hermetically sealing a first end portion of the housing, and a first bore seal formed separately from the first end closure and secured to the first end closure for mounting a first gas generant combustion initiation mechanism therein.

16. The vehicle occupant protection system of claim 15 wherein the gas generating system further includes a second end closure secured to the housing for hermetically sealing a second end portion of the housing, and a second bore seal formed separately from the second end closure and secured to the second end closure for mounting a second gas generant combustion initiation mechanism therein.

20. A gas generating system comprising:

a housing;

a first end closure secured to the housing for hermetically sealing a first end portion of the housing;

a first bore seal formed separately from the first end closure and secured to the first end closure for mounting a first gas generant combustion initiation mechanism therein; and

a smokeless gas generant material disposed in the housing, wherein at least 90% of the mass of the gas generant is converted to gas during combustion of the gas generant, and wherein a ratio of overall system length to overall system diameter is within a range from about 3.8/1 to about 5.3/1.