Linear inflator and mounting clip

• US 7,404,571 B2
• Filed: 02/25/2005
• Issued: 07/29/2008
• Est. Priority Date: 02/26/2004
• Status: Expired due to Fees

• 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: Stevens, Bruce A.
• Primary Examiner(s): Fleming; Faye M.
• Application Number:
  US11/067,027
• Publication Number:
  US 20050189740A1
• Time in Patent Office: 1,250 Days
• Field of Search: 280/728.2, 280/730.2, 280/741
• US Class Current: 280/728.2
• CPC Class Codes: B60R 21/2171 specially adapted for elongated cylindrical or bottle-like inflators with a symmetry axis perpendicular to the main direction of bag deployment, e.g. extruded reaction canisters B60R21/2176 takes precedence
• CPC Class Codes: B60R 21/232 Curtain-type airbags deploying mainly in a vertical direction from their top edge
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder

Abstract

An inflator (10) for use in an inflatable vehicle occupant protection system. In one aspect, the inflator (10) includes a longitudinal enclosure (22) having a substantially uniform cross-sectional area along at least a portion of the enclosure, and a gas generant composition (24) positioned along the portion of the enclosure (22). The gas generant composition (24) is distributed substantially uniformly along the portion of the enclosure (22). A plurality of gas exit apertures (40) is formed along the portion of the enclosure (22) to enable fluid communication between the enclosure (22) and an exterior of the enclosure. The apertures (40) are spaced apart a distance proportional to a desired rate of propagation of a combustion reaction of gas generant positioned between the apertures (40). In another aspect of the invention, the total number of apertures (40) along the enclosure (22) is inversely proportional to a desired rate of propagation of a combustion reaction of gas generant positioned between the apertures (40). An airbag system (100) incorporating the inflator (10) and methods of attaching the airbag system to a vehicle are also disclosed.

Claims

1. An airbag system comprising:

an airbag; and

a plurality of mounting clips coupled to the airbag for mounting the airbag to a vehicle, each mounting clip defining a cavity configured for receiving a portion of an inflator therein,

wherein the airbag includes a plurality of pairs of opposed tabs extending from edge portions thereof, and wherein a pocket is formed between the tabs of each pair of opposed tabs for receiving a portion of a respective mounting clip of the plurality of mounting clips therein; and

wherein each clip cavity resides within a portion of the airbag.

2. The airbag system of claim 1 further comprising the inflator received in the mounting clip cavities, the inflator being coupled to the airbag so as to enable fluid communication between the inflator and an interior of the airbag.

3. The airbag system of claim 1 wherein the plurality of pairs of opposed tabs are spaced along the edge portions of the airbag such that the mounting clips are substantially evenly spaced along a length of the inflator when the inflator is received within the mounting clip cavities and the mounting clips are positioned within the pockets.

4. The airbag system of claim 1 wherein the pockets formed between the pain of opposed tabs are in fluid communication with an interior of the airbag.

5. The airbag system of claim 1 wherein a seam between the opposed tabs of at least one pair of the plurality of pairs of opposed tabs is sealed to provide a substantially gas-tight seal.

6. The airbag system of claim 1 wherein each mounting clip of the plurality of mounting clips includes a body portion defining the cavity for receiving the portion of the inflator therein, and a first end portion projecting from the body portion.

7. The airbag system of claim 6 wherein each mounting clip of the plurality of mounting clips further comprises a second end portion projecting from the body portion.

8. The airbag system of claim 7 wherein the second end portion of each mounting clip extends adjacent the first end portion of the at least one clip.

9. The airbag system of claim 8 wherein an interference fit is formed between the inflator and a mounting clip when the second end portion of the clip contacts the first end portion of the clip.

10. The airbag system of claim 6 wherein the body portion is formed from two separate pieces.

11. The airbag system of claim 10 wherein the first end portion extends from a first one of the two separate pieces and a second end portion extends from a second one of the two separate pieces.

12. The airbag system of claim 1 wherein an interference fit is formed between the inflator and at least one clip of the plurality of mounting clips when the portion of the inflator is received in the cavity of the at least one clip.

13. The airbag system of claim 1 wherein an interference fit is formed between the inflator and at least one clip of the plurality of mounting clips when the portion of the inflator is received in the cavity and the at least one clip is mounted to the vehicle.

14. The airbag system of claim 1 wherein at least one clip of the plurality of mounting clips is positioned in an interior of the airbag.

15. The airbag system of claim 1 wherein the inflator comprises:

a longitudinal enclosure having a substantially uniform cross-sectional area along at least a portion of the enclosure, wherein said longitudinal enclosure comprises a first perforated section and a second perforated section, said first perforated section containing a first gas exit aperture area and said second perforated section containing a second gas exit aperture area, said second gas exit aperture area greater that said first gas exit aperture area;

a gas generant composition positioned within the at least a portion of the enclosure, the gas generant composition being distributed substantially uniformly along the at least a portion of the enclosure; and

an igniter operably fixed to said first perforated section for ignition of said gas generant composition upon inflator activation.

16. A vehicle occupant restraint system comprising:

an airbag; and

a plurality of mounting clips coupled to the airbag for mounting the airbag to a vehicle, each mounting clip defining a cavity configured for receiving a portion of an inflator therein,

wherein the airbag includes a plurality of pairs of opposed tabs extending from edge portions thereof; and

wherein a pocket is formed between the tabs of each pair of opposed tabs for receiving a portion of a respective mounting clip of the plurality of mounting clips therein; and

wherein each clip cavity resides within a portion of the airbag.