US 12,078,460 B2Granted

Gas generator

AssigneeDaicel Corporation

InventorKoji Yamamoto

Life of this patent

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Abstract

In a gas generator, a closing member includes: a first region exposed to a side of a second combustion chamber in a closed state, a second region in contact with a partition member from a side of the first combustion chamber in the closed state, and an engagement region that engages an engaged member fixed in a housing in the closed state; and the closing member is configured to have one or a plurality of communication holes be in a closed state by the closing member being supported at the partition member in the second region due to combustion pressure of a first gas generating agent and to have the closed state released by at least a part of the closing member, the closing member including a displacement portion that is formed continuously so as to be included at least a part of the first region, 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 a second gas generating agent acting on the first region.

Claims19

Dependent claims

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.

14 more elements

A gas generator, comprising:

a housing provided with a gas discharge port;
a first combustion chamber provided within the housing and including therein a first igniter and a first gas generating agent;
a second combustion chamber provided within the housing and including therein a second igniter and a second gas generating agent;
a partition structure provided within the housing and defining the first combustion chamber and the second combustion chamber;
a communication hole provided in the partition structure and connecting the first combustion chamber and the second combustion chamber;
and
a closure covering and closing the communication hole before actuation of the gas generator, and provided within the first combustion chamber so as to slide with respect to an engaged structure that is provided within the housing during the actuation of the gas generator, the closure opening the communication hole when the closure slides, the closure including,
a first surface opposing the communication hole and being exposed to the second combustion chamber before the actuation of the gas generator,
a second surface formed integrally with the first surface and being on the partition structure from a side of the first combustion chamber before the actuation of the gas generator, and
an engagement surface formed integrally with the first surface and the second surface, and being slidably engaged with the engaged structure,
wherein the closure slides when the first surface receives a combustion gas generated in the second combustion chamber to open the communication hole due to the second surface moving away from the partition structure.

8 more elements

A gas generator, comprising:

a housing provided with a gas discharge port;
a first combustion chamber provided within the housing and including therein a first igniter and a first gas generating agent;
a second combustion chamber provided within the housing and including therein a second igniter and a second gas generating agent;
a partition structure provided within the housing and defining the first combustion chamber and the second combustion chamber;
a communication hole provided in the partition structure and connecting the first combustion chamber and the second combustion chamber;
and
a closure provided within the first combustion chamber and engaged with an engaged structure that is provided within the housing, the closure covering and closing the communication hole before actuation of the gas generator and the closure including:
a first surface opposing the communication hole and being exposed to the second combustion chamber before the actuation of the gas generator,
a second surface formed integrally with the first surface and being on the partition structure from a side of the first combustion chamber before the actuation of the gas generator,
an engagement surface formed integrally with the first surface and the second surface, and being fixed to the engaged structure, and
at least one of a deformable portion or a weakened portion formed between the first surface and the engagement surface at which the first surface and the second surface are bent with respect to the engagement surface or the first surface and the second surface are further apart from the engagement surface, upon receipt of a combustion gas generated in the second combustion chamber to open the communication hole.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/624,574Filed 30 Jan 2020
Priority: JP 2019-13061412 Jul 2019
Published: US 2022/0268558 A125 Aug 2022
Granted: 3 Sep 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

F42B 3/04
Blasting cartridges, i.e. case and explosive: for producing gas under pressure
B01J 7/00
Apparatus for generating gases
B60R 21/2644
Using instantaneous generation of gas, e.g. pyrotechnic: using only solid reacting substances, e.g. pellets, powder
F42B 3/10
Blasting cartridges, i.e. case and explosive: initiators therefor

Family

US 2022/0268558 A1Pre-grant publication · published 25 Aug 2022
US 12,078,460 B2This patent

From the US filing history. Foreign family members aren’t listed.

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