Air bag inflator exit gas dispersion features

• US 6,206,417 B1
• Filed: 05/08/1998
• Issued: 03/27/2001
• Est. Priority Date: 05/08/1998
• Status: Expired due to Fees

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Jordan, Michael P., Soderquist, Quin, Hock, Christopher
• Primary Examiner(s): CULBRETH, ERIC D
• Application Number:
  US09/074,704
• Time in Patent Office: 1,054 Days
• Field of Search: 280/736, 280/740, 280/741, 280/742
• US Class Current: 280/736
• CPC Class Codes: B60R 21/217 Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together
• 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
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder

Abstract

An air bag device that includes an air bag cushion, a diffuser canister, and a gas generation inflator. The diffuser canister is attached to the air bag cushion and has walls configured to define an interior space therein. The walls of the diffuser canister have an interior surface, an exterior surface, and a wall thickness t. At least one of the walls has an aperture formed therethrough in communication with the interior of the air bag cushion. The gas generation inflator is configured to rapidly create a gas that exists the diffuser canister through the aperture so as to fill the air bag cushion. The aperture is defined by an edge extending between the interior and said exterior surfaces of the wall that is configured to diffuse the gas exiting the diffuser canister through the aperture. The edge of the aperture is configured such that the cross-sectional area of the aperture that is proximate to the exterior surface of the wall is larger than the cross-sectional area of the aperture proximate to the interior surface of wall. The edge includes an angled portion configured such that opposing sides of the aperture have an angle α therebetween in the range of about 20 degrees to about 145 degrees. The aperture has a diameter d₁ proximate to the interior surface of the wall and is configured so that the diameter d₁ and wall thickness t have a ratio d₁ to t in the range of about 0.5 to about 4.

Claims

1. An air bag device comprising:

(a) an air bag cushion;

(b) a diffuser canister having at least one aperture formed therein in direct communication with the interior of said air bag cushion;

(c) a gas generation inflator configured to rapidly create a gas within said diffuser canister, said gas exiting said diffuser canister through said aperture so as to fill said air bag cushion; and

(d) dispersing means for diffusing said gas exiting said diffuser canister through said aperture, said dispersing means comprising an edge defining said aperture, said edge being configured such that the cross-sectional area of said aperture increases as said gas exists said diffuser canister so as to diffuse said gas exiting said diffuser canister through said aperture.

2. An air bag device as recited in claim 1, wherein said edge defining said aperture comprises an angled portion, said angled portion being non-perpendicular to said diffuser canister.

3. An air bag device as recited in claim 2, wherein said angled portion of said edge on opposing sides of said aperture has an angle α

in the range of about 20 degrees to about 145 degrees.

4. An air bag device comprising:

(a) an air bag cushion having a gas inlet opening;

(b) a diffuser canister having a plurality of walls configured to define an interior space therein, each of said plurality of walls having an interior surface, an exterior surface, and a wall thickness t, one of said plurality of walls having an aperture formed therethrough in direct communication with the interior of said air bag cushion, said aperture being defined by an edge extending between said interior surface and said exterior surface of said wall;

(c) a gas generation inflator configured to rapidly create a gas within said diffuser canister, said gas exiting said diffuser canister through said aperture so as to fill said air bag cushion; and

(d) dispersing means for diffusing said gas exiting said diffuser canister through said aperture, said dispersing means comprising an edge defining the perimeter of said aperture, said edge being configured such that a diameter of said aperture proximate to said exterior surface of said wall is larger than a diameter d₁ of said aperture proximate to said interior surface of said wall.

5. An air bag device as recited in claim 4, wherein said edge defining said aperture comprises an angled portion, said angled portion on opposing sides of said aperture having an angle α

therebetween in the range of about 20 degrees to about 145 degrees.

6. An air bag device as recited in claim 5, wherein said angle α

of said angled portions of said edge on opposing sides of said aperture having a range of about 110 degrees to about 130 degrees.

7. An air bag device comprising:

(a) an air bag cushion;

(b) a diffuser canister having a plurality of walls configured to define an interior space therein, each of said plurality of walls having an interior surface and an exterior surface, one of said plurality of walls having at least one aperture formed therethrough in communication with the interior of said air bag cushion;

(c) a gas generation inflator configured to rapidly create a gas within said diffuser canister, said gas exiting said diffuser canister through said aperture so as to fill said air bag cushion; and

(d) means for causing turbulence in said gas exiting said diffuser canister through said aperture, said means comprising an edge defining said aperture.

8. An air bag device as recited in claim 7, wherein said edge comprises an angled portion configured to cause said gas exiting from a first aperture to intersect a flow of gas exiting a second aperture such that turbulence is created in said gas flowing from said apertures.

9. An air bag device comprising:

(a) an air bag cushion having a gas inlet opening;

(b) a diffuser canister having a plurality of walls configured to define an interior space therein, each of said plurality of walls having an interior surface and an exterior surface;

(c) a gas generation inflator configured to rapidly create a gas within said diffuser canister; and

(d) an aperture formed through one of said plurality of walls, said aperture being in communication with the interior of said air bag cushion, said aperture having a non-smooth cross section configured to cause turbulence in said gas exiting said diffuser canister through said aperture.

10. An air bag device as recited in claim 9, wherein said aperture is defined by an edge extending between the interior surface and the exterior surface of said wall, said edge comprising an angled portion configured such that the cross-sectional area of each of said apertures increases as said gas exits said diffuser canister so as to diffuse said gas exiting said diffuser canister through said plurality of apertures in addition to causing turbulence.