Reaction device for air bag module

• US 5,129,674 A
• Filed: 11/27/1990
• Issued: 07/14/1992
• Est. Priority Date: 11/27/1990
• Status: Expired due to Fees

• Current Assignee: TRW Vehicle Safety Systems Incorporated (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: TRW Vehicle Safety Systems Incorporated (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Levosinski, George J.
• Primary Examiner(s): Rice, Kenneth R.
• Application Number:
  US07/618,643
• Time in Patent Office: 595 Days
• Field of Search: 280/731, 280/732, 280/738, 280/743
• US Class Current: 280/738
• CPC Class Codes: B60R 21/30 with means to draw ambient air into the flow line and mix such air with the inflation fluid

Abstract

A reaction device for an air bag module includes a pair of spaced apart side walls adapted to support a cylindrical air bag inflator. A pair of spaced apart transverse walls extend between and connect the side walls. The side walls and the transverse walls cooperate to define (i) an air intake opening, (ii) a gas outlet opening, (iii) a venturi channel terminating in the gas outlet opening, and (iv) an air aspiration passage between the air intake opening and the venturi channel. The side walls are adapted to support the cylindrical inflator in a manner such that the cylindrical housing of the inflator spans the width of the reaction device. In addition, the gas dispensing nozzles of the inflator face the throat of the venturi channel. The reaction device, and the orientation of the inflator in the reaction device, facilitate the aspiration of significant quantities of ambient air during operation of the inflator.

Claims

1. A reaction device for an air bag module, comprising:

pair of spaced apart side walls;

a pair of spaced apart transverse walls extending between and connecting said side walls, said spaced apart side walls being adapted to support an air bag inflator;

said spaced apart side walls and said spaced apart transverse walls cooperating to define;

(i) an air intake opening,

(ii) a gas outlet opening,

(iii) a venturi channel terminating in said gas outlet opening, and

(iv) an aspiration passage between said air intake opening and said venturi channel.

2. A reaction device as set forth in claim wherein said spaced apart transverse walls have respective inner surfaces which are substantially continuous and in facing relation to each other, the inner surfaces of said pair of transverse walls cooperating to define a converging portion of said venturi channel, a diverging portion of said venturi channel, and a throat portion of said venturi channel joining said converging and diverging portions.

3. A reaction device as set forth in claim 2, wherein said spaced apart side walls are parallel to each other and adapted to support a cylindrical inflator with its cylindrical housing extending between said side walls and with its gas dispensing nozzles facing said throat of said venturi channel.

4. A reaction device as set forth in claim 3, further including flange structure connected with the portions of said side walls and transverse walls defining said gas outlet opening, said flange structure being adapted for attachment to a vehicle air bag.

5. A reaction device as set forth in claim 2, wherein each of said side walls has a rear edge portion, each of said transverse walls has a rear edge defining the wide end of said converging portion of said venturi channel, said rear edges of said transverse walls and said rear edge portions of said side walls forming said air intake

6. A reaction device as set forth in claim 5, wherein the flow area of said air intake opening is substantially greater than the flow area of said gas outlet

7. Apparatus for forming an air bag module, comprising a reaction device and a cylindrical inflator connected to said reaction device,

said reaction device comprising

a pair of spaced apart side walls, and

a pair of spaced apart transverse walls extending between and connecting said side walls

said spaced apart side walls and said spaced apart transverse walls cooperating to define

(i) an air intake opening,

(ii) a gas outlet opening,

(iii) a venturi channel terminating in said gas outlet opening, and ,

(iv) an air aspiration passage between said air intake opening and said venturi channel;

said cylindrical inflator having a cylindrical housing with gas dispensing nozzles formed in said housing, said cylindrical inflator being supported by said side walls with said cylindrical housing extending between said side walls.

8. Apparatus as set forth in claim 7, wherein said transverse walls have substantially continuous inner surfaces facing each other and cooperating to define a converging portion of said venturi channel, a diverging portion of said venturi channel and a throat section of said venturi channel joining said converging and diverging portions.

9. Apparatus as set forth in claim 8, wherein said inflator is located with (a) a part of its cylindrical housing disposed within the converging portion of said venturi channel and (b) its gas dispensing nozzles facing said throat portion of said venturi channel.

10. Apparatus as set forth in claim 9, wherein said cylindrical housing and each of said pair of transverse walls spans the distance between said pair of spaced apart side walls.

11. Apparatus as set forth in claim 10, wherein said pair of side walls are parallel to each other, and said cylindrical housing of said inflator has a central axis disposed perpendicular to said pair of parallel side walls.

12. Apparatus as set forth in claim 7, wherein said reaction device includes flange structure connected with the portions of said side walls and transverse walls defining said gas outlet opening, said flange structure being adapted for attachment to a vehicle air bag.

13. Apparatus as set forth in claim 8, wherein each of said side walls has a rear edge portion, each of said transverse walls has a rear edge defining the wide end of said converging portion of said venturi channel, said rear edges of said transverse walls and said rear edge portions of said side walls forming said air intake opening.

14. Apparatus as set forth in claim 13, wherein the flow area of said air intake opening is substantially greater than the flow area of said gas outlet opening.

15. A reaction device for an air bag assembly, comprising:

a pair of spaced apart side walls;

a pair of spaced apart transverse walls extending between and connecting said side walls, said spaced apart side walls being adapted to support an air bag inflator;

said spaced apart side walls and said spaced apart transverse walls cooperating to define;

(i) an air intake opening,

(ii) a gas outlet opening,

(iii) a venturi channel terminating in said gas outlet opening, and

(iv) an aspiration passage between said air intake opening and said venturi channel.

16. Apparatus for forming an air bag assembly, comprising a reaction device and a cylindrical inflator connected to said reaction device, said reaction device comprising:

a pair of spaced apart side walls, and

a pair of spaced apart transverse walls extending between and connecting said side walls

said spaced apart side walls and said spaced apart transverse walls cooperating to define

(i) an air intake opening,

(ii) a gas outlet opening,

(iii) a venturi channel terminating in said gas outlet opening, and

(iv) an air aspiration passage between said air intake opening and said venturi channel;

said cylindrical inflator having a cylindrical housing with gas dispensing nozzles formed in said housing, said cylindrical inflator being supported by said side walls and said cylindrical housing extending between said side walls.

17. Apparatus for forming an air bag assembly, comprising a reaction device and a cylindrical inflator supported by said reaction device,

said reaction device comprising:

a pair of spaced apart side walls, and

a pair of spaced apart transverse walls extending between and connecting said side walls,

said spaced apart side walls and said spaced apart transverse walls cooperating to define

(i) an air intake opening,

(ii) a gas outlet opening,

(iii) a venturi channel terminating in said gas outlet opening, and

(iv) an air aspiration passage between said

air intake opening and said venturi channel;

said cylindrical inflator having a cylindrical housing with gas dispensing nozzles formed in said housing, said cylindrical housing having a central axis disposed transverse to said pair of side walls.

18. Apparatus as set forth in claim 17 wherein said inflator is located with (a) a part of its cylindrical housing disposed within the converging portion of said venturi channel and (b) its gas dispensing nozzles facing said throat portion of said venturi channel.

19. Apparatus as set forth in claim 18, wherein said cylindrical housing and each of said pair of transverse walls spans the distance between said pair of spaced apart side walls.