US 12,240,400 B2
Side airbag device
Yuto Kobayashi, Kanagawa (JP); and Hiroyuki Shima, Kanagawa (JP)
Assigned to Autoliv Development AB, Vargarda (SE)
Appl. No. 17/904,353
Filed by Autoliv Development AB, Vargarda (SE)
PCT Filed Jan. 20, 2021, PCT No. PCT/JP2021/001846
§ 371(c)(1), (2) Date Aug. 16, 2022,
PCT Pub. No. WO2021/166530, PCT Pub. Date Aug. 26, 2021.
Claims priority of application No. 2020-027753 (JP), filed on Feb. 21, 2020.
Prior Publication US 2023/0071361 A1, Mar. 9, 2023
Int. Cl. B60R 21/207 (2006.01); B60R 21/231 (2011.01); B60R 21/2338 (2011.01); B60R 21/233 (2006.01)
CPC B60R 21/207 (2013.01) [B60R 21/23138 (2013.01); B60R 21/2338 (2013.01); B60R 2021/23146 (2013.01); B60R 2021/23324 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A side airbag device stowed in a seatback of a vehicle seat in combination with the vehicle seat, the side airbag device comprising:
an inflator arranged on an occupant side of a side frame positioned on a side portion inside the seatback that generates expansion gas; and
an airbag that is expandable by expansion gas for protecting an occupant seated on the vehicle seat,
wherein:
the airbag includes a main chamber that deploys toward a front of the seatback, and a pre-chamber that houses the inflator inside and is connected to the occupant side of the main chamber,
an internal tether having a front end part coupled to a front portion of the pre-chamber and a rear end part coupled to a rear portion of the pre-chamber is provided inside the pre-chamber,
the front portion of the pre-chamber and the front end part of the internal tether overlap the main chamber in an inside-outside direction upon expansion of the airbag; and
upon inflation of the airbag:
the pre-chamber is completely disposed on an inner side of the main chamber in the inside-outside direction,
an upper part and a lower part of the pre-chamber protrudes further forward than a center part of the pre-chamber upon inflation of the airbag,
the pre-chamber is disposed outside the main chamber and the pre-chamber and the main chamber are arranged in parallel with one another in a lateral direction as viewed from a top view, and
the main chamber protrudes further forward than the pre-chamber, in side view.