Airbag fabric diffuser

• US 6,945,556 B2
• Filed: 11/29/2002
• Issued: 09/20/2005
• Est. Priority Date: 11/29/2002
• Status: Expired due to Fees

• Current Assignee: Takata Restraint Systems Incorporated (Ningbo Junsheng Investment Group Co., Ltd.)
• Original Assignee: Takata Restraint Systems Incorporated (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Maertens, Paul G.
• Primary Examiner(s): English, Peter C.
• Application Number:
  US10/306,122
• Publication Number:
  US 20040104561A1
• Time in Patent Office: 1,026 Days
• Field of Search: 280/740, 280/730.2, 280/730.1, 280/729, 280/743.1, 280/743.2, 280/749, 280/742
• US Class Current: 280/729
• CPC Class Codes: B60R 2021/23316 Inner seams, e.g. creating separate compartments or used as tethering means
• CPC Class Codes: B60R 2021/23386 External tether means
• CPC Class Codes: B60R 21/213 in vehicle roof frames or pillars
• CPC Class Codes: B60R 21/232 Curtain-type airbags deploying mainly in a vertical direction from their top edge
• CPC Class Codes: B60R 21/233 comprising a plurality of individual compartments; comprising two or more bag-like members, one within the other B60R21/232 takes precedence
• CPC Class Codes: B60R 21/2338 Tethers
• CPC Class Codes: B60R 21/2346 Soft diffusers

Abstract

A perforated fabric diffuser and perforated cushion deflector are sewn inside an outer shell, thus forming a diffuser system within an airbag. The diffuser contains a plurality of openings along a folded edge. The deflector contains a wall defining at least one orifice for attenuating gas flow upon airbag activation. The airbag contains an inlet that fluidly communicates with the deflector and diffuser upon airbag activation. The outer shell is preferably sewn in such a manner as to maintain a plurality of individual cell areas. The fabric diffuser system is disposed within the outer shell such that the diffuser openings are positioned generally over the individual cells. During deployment, the diffuser system thereby functions to facilitate substantially even inflation throughout the airbag.

Claims

1. An airbag system for use in an automobile passenger compartment comprising:

an airbag having a given length comprising an inlet and a sewn outer shell, a perforated cloth diffuser and a perforated cushion deflector disposed internal to said outer shell, wherein said cushion deflector is disposed internal to said cloth diffuser, said cushion deflector comprises at least one gas flow attenuating orifice that provides for attenuating gas flow across said cloth diffuser, said cloth diffuser contains a plurality of gas distribution holes disposed across a portion of the length of said airbag, and said at least one gas flow attenuating orifice provides for attenuating gas flow from said inlet to a subset less than all of said gas distribution holes; and

a gas inflation device attached to the inlet of said airbag, the inlet in fluid communication with said perforated cushion deflector and said perforated cloth diffuser.

2. The airbag system of claim 1, wherein said airbag is of sufficient size, in an inflated state, to substantially cover a side window portion of the automobile passenger compartment.

3. The airbag system of claim 1, wherein said cloth diffuser and cushion deflector facilitate substantially uniform inflation of said airbag.

4. The airbag system of claim 1, wherein said sewn outer shall is sewn in such a manner as to form individual cells in both a forward portion and rearward portion of said airbag.

5. The airbag system of claim 4, wherein said cloth diffuser runs along a length of a top portion of said sewn outer shell and at least one of said plurality of gas distribution holes is substantially aligned with a corresponding at least one of said individual cells.

6. The airbag system of claim 1, further comprising a strap to connect said airbag to a pillar.

7. An airbag for a vehicle occupant protection system, said airbag having an interior and a given length, the airbag further comprising:

a shell forming the interior of said airbag;

a perforated fabric diffuser contained within said shell, said diffuser formed to define a gas entry orifice and said diffuser further comprising a plurality of gas exit apertures in fluid communication with the interior and extending across a portion of the length of said airbag;

a perforated fabric cushion deflector in fluid communication with and contained within said diffuser, said cushion deflector also formed to define said gas entry orifice, and said cushion deflector further comprising a fabric wall extending across an interior of said diffuser, said fabric wall comprising at least one gas flow attenuating orifice that upon airbag deployment is oriented at least partially laterally transverse to the length of the airbag,

whereby upon airbag actuation gas flows through said gas entry orifice then through said cushion deflector and through said gas exit apertures then into the airbag interior and across the length of the airbag.

8. An airbag for a vehicle occupant protection system, said airbag defining a gas entry orifice, an interior, and a given length, the airbag further comprising:

a shell forming the interior of said airbag;

a perforated fabric diffuser fixed within said shell, said diffuser further comprising a plurality of gas exit apertures in fluid communication with said gas entry orifice and the interior of said airbag, and said plurality of gas exit apertures distributed across at least a portion of the length of said airbag;

a perforated fabric cushion deflector in fluid communication with and contained within said diffuser, said cushion deflector also in fluid communication with said gas entry orifice, said cushion deflector comprising a fabric wall extending across an interior of said diffuser, said fabric wall comprising at least one gas flow attenuating orifice wherein said wall upon airbag deployment is at least partially laterally transverse to the length of the airbag,

whereby upon airbag actuation gas flowing through said gas entry orifice is attenuated at said gas flow attenuating orifice and forced through the gas exit apertures into the interior of the airbag.

9. A head side airbag system for use in an automobile passenger compartment, comprising:

an airbag adapted to be fixedly attached above a side window of the passenger compartment comprising a sewn outer shell, said sewn outer shell being sewn in such a manner as to form a plurality of individual cells in both a forward and rearward portion of said airbag, and a cloth diffuser and a cloth cushion deflector disposed internal to said sewn outer shell, said cloth diffuser comprising a plurality of holes disposed along an edge and said cloth cushion deflector comprising a perforated wall within said cloth diffuser, said wall defining at least one gas flow attenuating orifice and said wall extending across an interior of said diffuser at least partially transverse to gas flow upon airbag actuation; and

at least one gas inflation device, said inflation device fixed to an inlet of said airbag wherein said inlet fluidly communicates with said cloth diffuser, said cloth cushion deflector, and said plurality of holes upon airbag activation.

10. The head side airbag system of claim 9, wherein at least one of said plurality of holes of said cloth diffuser is substantially aligned with a corresponding at least one of said plurality of individual cells.

11. The head side airbag system of claim 9, wherein said airbag is of sufficient size, in an inflated state, to substantially cover a side window of the automobile passenger compartment.

12. The head side airbag system of claim 9, wherein said cloth diffuser facilitates substantially even inflation of said airbag.

13. The head side airbag system of claim 9, further comprising a strap to connect said airbag to a pillar.

14. A vehicle comprising:

a passenger compartment comprising a floor, a roof, a forward boundary, a rearward boundary and side, said sides being further comprised of at least one door, at least one window, a plurality of pillars and a roof frame;

at least one head side airbag system comprising an airbag fixedly attached to said roof frame, comprising a sewn outer shell, said sewn outer shell being sewn in such a manner as to perforated cloth diffuser and a perforated cushion deflector disposed internal to said sewn outer shell, said cloth diffuser comprising a plurality of holes disposed along an edge, said cushion deflector disposed internal to said cloth diffuser, and said cushion deflector is adapted to attenuate gas flow to a subset less than all of said plurality of holes disposed along said edge of said cloth diffuser; and

at least one gas inflation device, said gas inflation device being fixed to an inlet of said airbag wherein said inlet fluidly communicates with said perforated cushion deflector, said perforated cloth diffuser, and said plurality of holes thereby facilitating inflation of said airbag upon actuation thereof.

15. The vehicle of claim 14, wherein at least one of said plurality of holes of said cloth diffuser is substantially aligned with a corresponding at least one of said plurality of individual cells.

16. The vehicle of claim 14, wherein said airbag is of sufficient size, in an inflated state, to substantially cover said at least one window of said passenger compartment.

17. The vehicle of claim 14, wherein said diffuser facilitates even inflation of said airbag.

18. The vehicle of claim 14, wherein a strap connects said airbag to at least one of said plurality of pillars.

19. An airbag, comprising:

an outer shell comprising first and second panels;

a cushion deflector comprising a first orifice along a first axis; and

a diffuser comprising a plurality of second orifices along a second axis, wherein said outer shell, said diffuser and said cushion deflector are constructed of airbag cushion material, said cushion deflector is folded along said first axis, said diffuser is folded along said second axis substantially around said cushion deflector, said first and second axes are at least partially transverse with respect to one another, said diffuser is located substantially within said outer shell, said outer shell comprises an inlet adapted to receive an inflation fluid, said inlet is in direct fluid communication through said cushion deflector with said first orifice and with a first set of at least one of said plurality of second orifices, and said inlet is in fluid communication with a second set of at least one of said plurality of second orifices through said cushion deflector, through said first orifice, and through said diffuser, wherein said second set of at least one of said plurality of second orifices is different from said first set of at least one of said plurality of second orifices, whereby said first orifice is adapted to restrict a flow of inflation fluid therethrough.

20. An airbag as recited in claim 19, wherein said first and second panels are sewn to one another so as to form first and second interior portions, said first set of at least one of said plurality of second orifices are adapted to discharge said inflation fluid into said first interior portion, and said second set of at least one of said plurality of second orifices are adapted to discharge said inflation fluid into said second interior portion.

21. An airbag as recited in claim 20, wherein at least one of said first interior portion and said second interior portion comprise a plurality of individual cells, and at least one of said second orifices is aligned with a corresponding one of said plurality of individual cells so as to provide for discharging said inflation fluid from said at least one of said second orifices into said corresponding one of said plurality of individual cells.

22. An airbag as recited in claim 19, wherein said cushion deflector and diffuser are sewn between said first and second panels with at least one seam.

23. An airbag as recited in claim 19, wherein said cushion deflector comprises at least one first tab, said diffuser comprises at least one second tab, and at least one of said first panel and said second panel comprise at least one third tab, wherein at least one said first tab is aligned with at least one said second tab, and is aligned with at least one said third tab.

24. An airbag as recited in claim 23, wherein said at least one first tab, said at least one second tab, and said at least one third tab are adapted to attach the airbag to a vehicle.

25. An airbag as recited in claim 19, wherein said cushion deflector comprises a first inlet portion, said diffuser comprises a second inlet portion, and said first inlet portion and said second inlet portion are aligned with one another and with said inlet of said outer shell.

26. An airbag as recited in claim 25, wherein said first inlet portion, said second inlet portion and said inlet of said outer shell are sewn to one another with at least one seam.