Gas generating system

• US 20050230949A1
• Filed: 04/18/2005
• Published: 10/20/2005
• Est. Priority Date: 04/19/2004
• Status: Active Grant

• Current Assignee: Automotive Systems Laboratory, Incorporated (Ningbo Junsheng Investment Group Co., Ltd.)
• Original Assignee: Automotive Systems Laboratory, Incorporated (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Blackburn, Jeffery S.
• Granted Patent: US 7,367,584 B2
• Time in Patent Office: Days
• US Class Current: 280/736
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder
• CPC Class Codes: B60R 21/274 characterised by means to rupture or open the fluid source

Abstract

A gas generator (10) includes an igniter (27) and first and second inflation gas generant compositions (52, 52′) positioned to enable fluid communication with the igniter (27) upon activation of the igniter. Flow regulators (54, 54′) are provided to regulate a flow of combustion products from the igniter (27) to the first and second inflation gas generant compositions (52, 52′), to correspondingly regulate a time period between activation of the igniter (27) and initiation of combustion of the first and second inflation gas generant compositions (52, 52′). In another aspect, the gas generator (10) includes a modular baffle system (70) including a first baffle chamber (71) in fluid communication with an inflation gas generant combustion chamber (50) for receiving therein combustion products from combustion of an inflation gas generant (52) positioned in the combustion chamber. An outer baffle chamber (74) is also positioned radially outwardly from the first baffle chamber (71) for receiving therein combustion products from the first baffle chamber. In yet another aspect, the gas generator includes a first enclosure (12), a second enclosure (24), and a projection (44) formed on one of the first enclosure and the second enclosure. An aperture (46) is formed in the other one of the first enclosure (12) and the second enclosure (24) for receiving the projection (44) therein. At least a portion of the projection (44) is fixed within the aperture (46) to prevent withdrawal of the projection (44) from the aperture (46), thereby securing together the first enclosure (12) and the second enclosure (24).

Claims

1. A gas generating system including a gas generator comprising:

an igniter;

a first inflation gas generant composition positioned to enable fluid communication with the igniter upon activation of the igniter; and

a first flow regulator adapted to regulate a flow of combustion products from the igniter to the first inflation gas generant composition, to correspondingly regulate a time period between activation of the igniter and initiation of combustion of the first inflation gas generant composition.

2. The gas generating system of claim 1 further comprising a second inflation gas generant composition positioned to enable fluid communication with the igniter upon activation of the igniter;

and

a second flow regulator adapted to regulate a flow of combustion products from the igniter to the second inflation gas generant composition, to correspondingly regulate the time period between activation of the igniter and initiation of combustion of the second inflation gas generant composition.

3. The gas generating system of claim 2 wherein the first flow regulator is adapted to regulate the flow of combustion products from the igniter to the first inflation gas generant composition, and the second flow regulator is adapted to regulate the flow of combustion products from the igniter to the second inflation gas generant composition, such that the time period between activation of the igniter and initiation of combustion of the first inflation gas generant composition is different from the time period between activation of the igniter and initiation of combustion of the second inflation gas generant composition.

4. A gas generating system comprising:

a baffle system including—

a first baffle chamber in fluid communication with an inflation gas generant combustion chamber for receiving therein combustion products from combustion of an inflation gas generant positioned in the combustion chamber; and

an outer baffle chamber positioned radially outwardly from the first baffle chamber for receiving therein combustion products from the first baffle chamber.

5. The gas generating system of claim 4 further comprising a second baffle chamber positioned radially inwardly of the outer baffle chamber for receiving therein combustion products from the outer baffle chamber.

6. The gas generating system of claim 4 further comprising an enclosure defining the inflation gas generant combustion chamber;

and

at least one orifice formed in the enclosure for regulating a flow of combustion products from the inflation gas-generant combustion chamber into the first baffle chamber.

7. A gas generating system comprising:

a modular baffle assembly including;

an enclosure; and

a plurality of discrete baffle elements positioned within the enclosure, each baffle element of the plurality of baffle elements being spaced apart from a wall of the enclosure to define a flow passage for an inflation fluid between each baffle element of the plurality of baffle elements and the wall, a first baffle element of the plurality of baffle elements defining a first baffle chamber, the first baffle chamber being in fluid communication with the flow passage, a second baffle element of the plurality of baffle elements defining a second baffle chamber, the second baffle chamber being in fluid communication with the flow passage, at least one of the first and second baffle chambers being positioned so as to enable fluid communication with an enclosure containing an inflation gas generant composition upon activation of the gas generator.

8. The gas generating system of claim 7 wherein the first baffle element is positioned adjacent the second baffle element.

9. The gas generating system of claim 7 further comprising a barrier for substantially preventing direct fluid communication between the first baffle chamber and the second baffle chamber.

10. The gas generating system of claim 7 wherein the first baffle element is adapted for channeling flow of an inflation fluid from the first baffle chamber into the flow passage, and the flow passage is adapted for channeling flow of the inflation fluid from the first baffle chamber into the second baffle chamber.

11. The gas generating system of claim 10 wherein the second baffle element is adapted for channeling flow of the inflation fluid from the second baffle chamber to an exterior of the gas generating system.

12. The gas generating system of claim 10 wherein a third baffle element of the plurality of baffle elements defines a third baffle chamber, the third baffle chamber being in fluid communication with the second baffle chamber, and wherein the second baffle element is adapted for channeling flow of an inflation fluid from the second baffle chamber into the third baffle chamber.

13. The gas generating system of claim 12 wherein a fourth baffle element of the plurality of baffle elements defines a fourth baffle chamber, the fourth baffle chamber being in fluid communication with the flow passage, the third baffle chamber being in fluid communication with the flow passage, the flow passage being adapted for channeling flow of an inflation fluid from the third baffle chamber into the fourth baffle chamber.

14. The gas generating system of claim 7 wherein at least one of the first baffle element and the second baffle element includes a base portion and a wall extending from the base portion, the base portion and the wall defining a respective baffle chamber.

15. A gas generating system comprising gas generator including:

a first enclosure;

a second enclosure;

a projection formed on one of the first enclosure and the second enclosure; and

an aperture formed in the other one of the first enclosure and the second enclosure for receiving the projection therein, at least a portion of the projection being fixed within the aperture to prevent withdrawal of the projection from the aperture, thereby securing together the first enclosure and the second enclosure.

16. The gas generating system of claim 15 wherein the first enclosure comprises an igniter assembly and the second enclosure comprises a gas generator housing.

17. The gas generating system of claim 15 wherein the first enclosure comprises an igniter assembly and the second enclosure defines a combustion chamber for an inflation gas generating composition, and wherein the second enclosure is positioned so as to enable fluid communication with the first enclosure upon activation of the gas generator.

18. The gas generating system of claim 17 wherein the projection is formed on the second enclosure and an orifice is formed in the second enclosure extending through the projection to regulate the flow of a fluid between the first enclosure and the second enclosure.

19. The gas generating system of claim 15 wherein an interference fit is formed between the projection and the aperture to prevent withdrawal of the projection from the aperture.

20. The gas generating system of claim 15 wherein at least one of the first enclosure and the second enclosure includes a wall having a first side and a second side opposite the first side, and a length of the projection is sized to exceed a thickness of the wall such that a portion of the projection inserted into the aperture along the first side of the wall extends beyond the second side of the wall, the portion of the projection extending beyond the second side of the wall being deformable to prevent withdrawal of the projection from the aperture.