CURTAIN AIRBAG SYSTEM

• US 20080309056A1
• Filed: 06/13/2008
• Published: 12/18/2008
• Est. Priority Date: 06/13/2007
• Status: Active Grant

• Current Assignee: Autoliv AB (Autoliv Incorporated)
• Original Assignee: Autoliv AB (Autoliv Incorporated)
• Inventors: Ohba, Yoshihiro
• Granted Patent: US 7,658,402 B2
• Time in Patent Office: Days
• US Class Current: 280/730.2
• CPC Class Codes: B60R 2021/2612 Gas guiding means, e.g. ducts
• CPC Class Codes: B60R 21/232 Curtain-type airbags deploying mainly in a vertical direction from their top edge
• 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

Abstract

An airbag is disposed over almost the entire length along a roof side rail. The airbag comprises a duct formed with a gas introduction hole and a plurality of chambers communicating with the duct. The duct comprises a long first duct part and a short second duct part arranged with the gas introduction hole being provided therebetween. The inlet of a chamber closest to the gas introduction hole in the first duct part has a shape that becomes narrower gradually from the upper part toward the lower part. The passage width of the uppermost part of the inlet of the closest chamber is greater than the depth to the narrowest part thereof, and the passage width of the narrowest part is narrower than the passage width of the first duct part around the inlet thereof.

Claims

1. An airbag for a curtain airbag system that is disposed over substantially the entire length of a roof side rail of a vehicle in the front and rear directions and stored on the roof side rail in the folded state, and being expandingly deployable with gas sent from an inflator which is introduced through a gas introduction hole of the airbag, the airbag comprising a duct formed with the gas introduction hole and a plurality of chambers communicating with the duct, the duct including a first duct part and a second duct part which is shorter than the first duct part, and the gas introduction hole being arranged between the first and second duct parts, wherein an inlet of one of the chambers closest to the gas introduction hole in the first duct part has a shape that becomes narrower gradually from an upper part toward a lower part, and a passage width of an uppermost part of the inlet of the closest chamber is greater than a depth to a narrowest part of the inlet of the closest chamber, and a passage width of the narrowest part is narrower than a passage width of the first duct part around the inlet of the closest chamber.

2. The airbag according to claim 1, wherein the inlet of the closest chamber ranging from the first duct part to the narrowest part has a curved shape that is convex facing toward the first duct part.

3. The airbag according to claim 2, wherein the curved shape has a radius of curvature of a curve on a side close to the gas introduction hole that is smaller than a radius of curvature of a curve on a side distant from the gas introduction hole.