CUSHION OF AIR BAG MODULE

• US 20070138773A1
• Filed: 06/22/2006
• Published: 06/21/2007
• Est. Priority Date: 12/15/2005
• Status: Active Grant

• Current Assignee: Hyundai Mobis Co., Ltd.
• Original Assignee: Hyundai Mobis Co., Ltd.
• Inventors: SONG, June-Young
• Granted Patent: US 7,523,960 B2
• Time in Patent Office: Days
• US Class Current: 280/729
• CPC Class Codes: B60R 2021/23324 Inner walls crating separate compartments, e.g. communicating with vents
• CPC Class Codes: B60R 21/231 characterised by their shape, construction or spatial configuration
• 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 21/2346 Soft diffusers

Abstract

The cushion of an air bag module includes a first chamber part which deploys to one side of an occupant by a high pressure gas of an inflator, a second chamber part which is formed to communicate with the first chamber part and deploys to the other side of the occupant by the high pressure gas in the first chamber part, an inner pocket which is mounted on an inner side of the first chamber part to introduce gas from the inflator and has a plurality of vent holes to emit the gas into the first chamber part, and a diffuser provided at the vent holes of the inner pocket so that the gas emitted from the inner pocket forms an eddy current at a side of the second chamber part.

Claims

1. A cushion of an air bag module, comprising:

a first chamber part which deploys to one side of an occupant by a high pressure gas of an inflator;

a second chamber part which is formed to communicate with the first chamber part and deploys to the other side of the occupant by the high pressure gas in the first chamber part;

an inner pocket which is mounted on an inner side of the first chamber part to introduce gas from the inflator and has a plurality of vent holes to emit the gas into the first chamber part; and

a diffuser provided at the vent holes of the inner pocket so that the gas emitted from the inner pocket forms an eddy current at a side of the second chamber part.

2. The cushion of claim 1, wherein the plurality of vent holes are formed at the inner pocket, and the diffuser is formed at at least one of the plurality of vent holes so that a flow velocity of the gas emitted from the vent holes can increase as the diffuser becomes farther from the second chamber part.

3. The cushion of claim 2, wherein the diffuser is constructed in a tubular shape in which an inlet is connected to one of the vent holes and an outlet projects to an inside of the first chamber part.

4. The cushion of claim 3, wherein the diffuser is formed in an inflatable nozzle structure in which the cross sectional area extends as the diffuser goes toward the outlet from the inlet.

5. The cushion of claim 4, wherein if the flow velocity of the gas emitted through the vent holes is greater than a supersonic velocity, the diffuser is provided at the vent holes formed at a position spaced from the second chamber part.

6. The cushion of claim 5, wherein the diffuser is provided at the plurality of vent holes so that the cross sectional area of the outlet becomes larger as the diffuser becomes farther from the second chamber part.

7. The cushion of claim 4, wherein if the flow velocity of the gas emitted through the vent holes is less than a supersonic velocity, the diffuser is provided at the vent holes formed at a position close to the second chamber part.

8. The cushion of claim 7, wherein the diffuser is provided at the plurality of vent holes so that the cross sectional area of the outlet becomes larger as the diffuser becomes farther from the second chamber part.

9. The cushion of claim 4, wherein a barrier is formed between the first chamber part and the second chamber part, and a plurality of through holes through which gas passes are formed at the barrier.

10. The cushion of claim 4, wherein the first chamber part has a round-shaped eddy current induction part which induces an eddy current of the gas to a region thereof opposed to the vent holes.

11. The cushion of claim 4, wherein the first chamber part is a thorax chamber part which deploys toward a chest of the occupant, while the second chamber part is a head chamber part which deploys toward a head of the occupant.

12. The cushion of claim 4, wherein the diffuser is formed of the same fabric material as the inner pocket is, and thus the inlet thereof is sewn to the inner pocket so as to communicate with the vent holes.