US 12,134,365 B2
Gas generator
Shinya Yabuuchi, Himeji (JP); Yoshiki Tsutsumi, Himeji (JP); Kouichi Nakamura, Himeji (JP); Petr Holub, Vsetin (CZ); and Radek Simara, Vsetin (CZ)
Assigned to NIPPON KAYAKU KABUSHIKI KAISHA, Chiyoda-ku (JP)
Appl. No. 17/423,263
Filed by NIPPON KAYAKU KABUSHIKI KAISHA, Chiyoda-ku (JP)
PCT Filed Jan. 17, 2020, PCT No. PCT/JP2020/001472
§ 371(c)(1), (2) Date Jul. 15, 2021,
PCT Pub. No. WO2020/149399, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 2019-007062 (JP), filed on Jan. 18, 2019.
Prior Publication US 2022/0126784 A1, Apr. 28, 2022
Int. Cl. B60R 22/46 (2006.01); F42B 3/04 (2006.01)
CPC B60R 22/4628 (2013.01) [F42B 3/04 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A gas generator comprising:
a gas generating agent that generates gas as the gas generating agent burns;
an igniter including an ignition portion loaded with a terminal pin connected to the ignition portion;
a cylindrical cup having a bottom portion configured to accommodate the gas generating agent, the cylindrical cup including one axial end as an opening end; and
a columnar holder to which the cup is coaxially assembled to close the opening end, the columnar holder holding the igniter such that the ignition portion faces the gas generating agent, wherein
an annular step portion is provided at a periphery of an axial end of the holder on a side facing the cup, and
the cup is fixed to the holder by fitting the opening end to the annular step portion and providing an annular welded portion at the opening end, the annular welded portion being, joined to the annular step portion so as to extend along a circumferential direction of the cup,
wherein a maximum outer dimension in a radial direction of the cup including the annular welded portion is equal to or smaller than a maximum outer dimension in the radial direction of the holder,
wherein a maximum outer dimension in a radial direction of the cup in a portion fitted to the annular step portion except for the annular welded portion is smaller than a maximum outer dimension in the radial direction of the holder,
wherein the opening end of the cup is substantially in a straight cylindrical shape,
wherein the annular step portion is defined by a first step forming surface formed from a peripheral surface of the holder continuous to the axial end surface of the holder on the side facing the cup and an annular planar second step forming surface continuous to the first step forming surface and continuous to the outer peripheral surface of the holder, and
wherein the annular welded portion is provided at the opening end of the cup in a portion facing the first step forming surface, at a position distant from a tip end surface of the opening end of the cup, so as to be joined to the first step forming surface without being joined to the second step forming surface.