US 12,078,460 B2
Gas generator
Koji Yamamoto, Tokyo (JP)
Assigned to DAICEL CORPORATION, Osaka (JP)
Appl. No. 17/624,574
Filed by Daicel Corporation, Osaka (JP)
PCT Filed Jan. 30, 2020, PCT No. PCT/JP2020/003517
§ 371(c)(1), (2) Date Jan. 4, 2022,
PCT Pub. No. WO2021/009948, PCT Pub. Date Jan. 21, 2021.
Claims priority of application No. 2019-130614 (JP), filed on Jul. 12, 2019.
Prior Publication US 2022/0268558 A1, Aug. 25, 2022
Int. Cl. F42B 3/04 (2006.01); B01J 7/00 (2006.01); B60R 21/264 (2006.01)
CPC F42B 3/04 (2013.01) [B01J 7/00 (2013.01); B60R 21/264 (2013.01); B60R 2021/2642 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A gas generator comprising:
a housing;
a first igniter;
a second igniter to be actuated independently of the first igniter;
a partition structure to define, in the housing, a first combustion chamber in which the first igniter and a first gas generating agent combusted by actuation of the first igniter are accommodated and a second combustion chamber in which the second igniter and a second gas generating agent combusted by actuation of the second igniter are accommodated; and
a gas discharge port, provided in the housing, to connect the first combustion chamber and outside of the housing,
wherein at least one communication hole provided in the partition structure connects the first combustion chamber and the second combustion chamber, and
a single closing structure is further provided to entirely cover the at least one communication hole from a side of the first combustion chamber to obtain a closed state in which the at least one communication hole is closed;
the closing structure includes,
a first surface exposed to a side of the second combustion chamber in the closed state,
a second surface in contact with the partition structure from the side of the first combustion chamber in the closed state, and
an engagement surface that is engaged with an engaged structure fixed in the housing in the closed state; and
wherein the closing structure is configured to:
have the at least one communication hole to be in the closed state by the closing structure being supported by the partition structure at the second surface due to combustion pressure of the first gas generating agent; and have the closed state released by at least a part of the closing structure,
the closing structure including a displacement portion that is formed continuously so as to include at least a part of the first surface, the closing structure being displaced in a direction from the side of the second combustion chamber toward the side of the first combustion chamber by combustion pressure of the second gas generating agent acting on the first surface.