Airbag and airbag device

• US 20060091649A1
• Filed: 09/29/2005
• Published: 05/04/2006
• Est. Priority Date: 10/22/2004
• Status: Abandoned Application

• Current Assignee: Takata Corporation (Ningbo Junsheng Investment Group Co., Ltd.)
• Original Assignee: Takata Corporation (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Kumagai, Masayoshi, Abe, Kazuhiro
• Application Number:
  US11/237,790
• Publication Number:
  US 20060091649A1
• 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 21/233 comprising a plurality of individual compartments; comprising two or more bag-like members, one within the other B60R21/232 takes precedence

Abstract

An airbag is partitioned into a first chamber and a second chamber, not having significant irregularities or partial protrusions on the front surface thereof (front panel) during the expansion, and is capable of catching an occupant in a substantially even manner at the front surface thereof. The airbag is formed by connecting a front panel and a rear panel by a first seam. An inner panel is disposed inside the airbag. The inner panel has communicating holes and inner vent holes. The inner periphery of the inner panel is connected to the front panel by a second seam. When the airbag is flattened, the ratio C₁/C₂ of a perimeter C₁ of the second seam to a perimeter C₂ of the first seam ranges from about 0.35 to about 0.8.

Claims

1. An airbag inflated by a gas from a gas generator, comprising:

a front panel disposed adjacent to an occupant, and a rear panel disposed remote from the occupant and having a first opening for the gas generator formed in a center thereof, said front and rear panels having peripheries connected together; and

an inner panel for partitioning an interior of the airbag into a first chamber in a center and a second chamber surrounding the first chamber, said inner panel having a second opening formed in a center thereof substantially concentrically with the first opening of the rear panel, and a periphery connected to an intermediate portion between a center and the periphery of the front panel;

wherein a ratio C₁/C₂ of a perimeter C₁ of a connecting portion between the periphery of the inner panel and the front panel to a perimeter C₂ of a connecting portion between the front panel and the rear panel ranges from about 0.35 to about 0.8 when the airbag is flattened.

2. The airbag according to claim 1, wherein the inner panel comprises a first inner panel adjacent to the front panel and a second inner panel adjacent to the rear panel, a rear end of the first inner panel being connected to a front end of the second inner panel.

3. The airbag according to claim 2, wherein the ratio C₁/C₂ ranges from about 0.4 to about 0.7.

4. The airbag according to claim 2, wherein the ratio C₁/C₂ ranges from about 0.45 to about 0.65.

5. The airbag according to claim 2, wherein said inner panel further includes a plurality of communicating holes for communicating the first chamber to the second chamber.

6. The airbag according to claim 5, wherein the communicating holes are disposed at positions facing the gas port.

7. The airbag according to claim 2, wherein the inner panel further comprises a vent hole connecting the first chamber to the second chamber.

8. The airbag according to claim 7, wherein the rear panel further comprises a vent hole opening to atmosphere.

9. An airbag device, comprising the airbag according to claim 1 and a gas generator having a gas port, wherein at least a front end of the gas generator is disposed inside the airbag, and the gas port is disposed inside the airbag.

10. The airbag device according to claim 9, further comprising a retainer on which the airbag and the gas generator are mounted;

and a module cover fixed to the retainer to cover a folded airbag.