Air Bag Assembly Unit

• US 20080129019A1
• Filed: 01/27/2006
• Published: 06/05/2008
• Est. Priority Date: 01/28/2005
• Status: Active Grant

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Wagener, Keit, Fangmann, Thomas, Imken, Hans-Juergen
• Granted Patent: US 7,806,429 B2
• Time in Patent Office: Days
• 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

Abstract

An air bag assembly unit is provided for an occupant restraint systems in motor vehicles with an air bag, which is accommodated by an air bag housing and is to be filled with gas by the contents of a gas generator. The assembly unit includes a diffusor housing, which is arranged at the air bag housing, is connected to the air bag housing via gas passage openings, and in which the gas generator pushed in via an installation opening is fixed by a holding device. The holding device is formed from a fastening ring (7), which is arranged in the intermediate space (5) of the diffusor housing wall (8) and the gas generator wall (9), seals the intermediate space (5) by a sealing device (6) in a gas-tight manner and surrounds the gas generator (2) in a ring-shaped pattern. The fastening ring (7) is fixed at the diffusor housing wall (8) in a positive-locking manner.

Claims

1. An air bag assembly unit for an occupant restraint system in motor vehicles, the air bag assembly unit comprising:

an air bag;

an air bag housing;

a gas generator, said air bag being accommodated in said air bag housing to be filled with gas by the contents of said gas generator ;

a diffusor housing arranged at or forming a part of said air bag housing;

a holding device, said gas generator being pushed in said diffuser housing via an installation opening is fixed by said holding device, the holding device comprising a fastening ring arranged in an intermediate space of said diffusor housing, said intermediate space being defined by a diffusor housing wall and a gas generator wall, and a sealing device sealing said intermediate space in a gas-tight manner and surrounding said gas generator in a ring-shaped manner, wherein said fastening ring is fixed at said diffusor housing wall in a positive-locking manner.

2. An air bag unit for an occupant restraint system in motor vehicles in accordance with claim 1, wherein the positive-locking fixing of said fastening ring at said diffusor housing wall is provided by a snap-in device.

3. An air bag unit for an occupant restraint system in motor vehicles in accordance with claim 2, wherein the snap-in device has a plurality of elastic holding tabs arranged radially on the outer circumference of said fastening ring, and which mesh with corresponding recesses arranged on said diffusor housing wall in the installed state of said fastening ring.

4. An air bag unit for an occupant restraint system in motor vehicles in accordance with claim 3, wherein four said holding tabs are arranged radially on the outer circumference of said fastening ring.

5. An air bag unit for an occupant restraint system in motor vehicles in accordance with claim 1, wherein said sealing device has at least two said sealing lips, which are arranged on said fastening ring radially circumferentially and which are arranged in relation to one another such that said sealing device forms an essentially V-shaped cross section, wherein said sealing lips form a leg each of said V-shaped cross section and wherein leg ends connected to one another are arranged in the direction of said installation opening of said diffusor housing.

6. An air bag unit for an occupant restraint system in motor vehicles in accordance with claim 1, wherein said fastening ring has a stop device for limiting the axial motion of said gas generator in the direction of said installation opening of said diffusor housing in the mounted state of said gas generator.

7. An air bag unit for an occupant restraint system in motor vehicles in accordance with claim 6, wherein said stop device has a plurality of said elastic stop tabs, which are arranged in a projecting manner on the inner side of said fastening ring.

8. An air bag unit for an occupant restraint system in motor vehicles in accordance with claim 1, wherein said fastening ring is made of a plastic.

9. An air bag unit for an occupant restraint system in motor vehicles in accordance with claim 8, wherein said fastening ring consisting of a plastic having fiber reinforcements or stabilizing inserts.

10. An air bag assembly unit for an occupant restraint system in motor vehicles, the air bag assembly unit comprising:

a gas generator;

a diffusor housing; and

a holding device, said gas generator being disposed in said diffuser housing and fixed therein by said holding device, an inner diffusor housing wall of said diffusor housing and an outer gas generator wall of said gas generator cooperating to define an intermediate space, said holding device comprising a fastening ring arranged in said intermediate space and a sealing device sealing said intermediate space in a gas-tight manner, said sealing device surrounding said gas generator in a ring-shaped manner, said fastening ring including positive locking fixing means for fixing said fastening ring at said diffusor housing wall in a positive-locking manner.

11. An air bag unit in accordance with claim 10, wherein said positive locking fixing means comprises a snap-in device.

12. An air bag unit in accordance with claim 11, wherein said snap-in device comprises a plurality of elastic holding tabs arranged radially on the outer circumference of said fastening ring and corresponding recesses arranged on said diffusor housing wall, said tabs being engaged in respective one of said recesses in the installed state of said fastening ring.

13. An air bag unit in accordance with claim 12, wherein four said holding tabs are arranged extending radially on the outer circumference of said fastening ring.

14. An air bag unit in accordance with claim 10, wherein said sealing device has at least two said sealing lips, which are arranged on said fastening ring radially circumferentially and which are arranged in relation to one another such that said sealing device forms an essentially V-shaped cross section, wherein said sealing lips form a leg each of said V-shaped cross section and wherein leg ends connected to one another are arranged in the direction of said installation opening of said diffusor housing.

15. An air bag unit in accordance with claim 10, wherein said fastening ring has a stop device for limiting the axial motion of said gas generator in the direction of an installation opening of said diffusor housing in the mounted state of said gas generator.

16. An air bag unit in accordance with claim 15, wherein said stop device has a plurality of said elastic stop tabs arranged in a projecting manner on an inner side of said fastening ring.

17. An air bag unit in accordance with claim 10, wherein said fastening ring is made of a plastic.

18. An air bag unit in accordance with claim 10, wherein said fastening ring is formed of a plastic having fiber reinforcements or stabilizing inserts.