Gas generator
First Claim
Patent Images
1. A gas generator comprising:
- a diffuser shell which has a top plate and an upper circumferential wall plate provided with a gas discharge port, a closure shell which has a bottom plate and a lower circumferential wall plate, a housing, as an outer shell, obtained by joining and integrating only the upper circumferential wall plate and the lower circumferential wall plate,in the housing,an ignition device chamber defined by a cup-shaped container which accommodates an ignition device,a combustion chamber defined to surround the ignition device chamber and charged with a gas generating agent,an annular or flat-plate filter disposed to face the top plate and to be spaced from the upper circumferential wall plate,a first support member abutting against and supporting an upper surface of the filter,a second support member abutting against and supporting an lower surface of the filter,the first support member including,a disk-shaped portion and an annular wall portion, the disk-shaped portion provided with a plurality of communication holes formed only at a section in contact with the upper surface of the filter,one surface of the disk-shaped portion abutting against the top plate, the other surface of the disk-shaped portion abutting against the upper surface of the filter, the annular wall portion abutting against a part of an outer circumferential surface of the filter;
the second support member including,a substantially cylindrical wall portion and an annular flat portion formed at a circumference in one end of the substantially cylindrical wall portion, andthe substantially cylindrical wall portion being fixed to the housing, the annular flat portion abutting against the lower surface of the filter,and, during actuation, a gap being formed between the top plate and the first support member; and
a gap being formed between the upper circumferential wall plate and the first support member,when a pressure inside the combustion chamber increases due to combustion gas generated by combustion of the gas generating agent and the top plate of the diffuser shell is deformed.
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Accused Products
Abstract
A gas generator includes,
- a housing comprising circumferential wall plates of a diffuser shell and a closure shell,
- an ignition device chamber,
- a combustion chamber surrounding the ignition device chamber and containing a gas generating agent,
- an annular or flat-plate filter disposed facing the top plate and spaced from the circumferential wall plate,
- a first support including a disk-shaped portion abutting against and supporting an upper surface of the filter, including communication holes only at a section in contact with the filter,
- a second support including an annular flat portion abutting against and supporting a lower surface of the filter and cylindrical wall portion fixed to the housing.
A gap is formed between the top plate of the housing and the circumferential wall plate and the first support member, when a pressure inside the combustion chamber increases due to combustion and the top plate is deformed.
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Citations
9 Claims
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1. A gas generator comprising:
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a diffuser shell which has a top plate and an upper circumferential wall plate provided with a gas discharge port, a closure shell which has a bottom plate and a lower circumferential wall plate, a housing, as an outer shell, obtained by joining and integrating only the upper circumferential wall plate and the lower circumferential wall plate, in the housing, an ignition device chamber defined by a cup-shaped container which accommodates an ignition device, a combustion chamber defined to surround the ignition device chamber and charged with a gas generating agent, an annular or flat-plate filter disposed to face the top plate and to be spaced from the upper circumferential wall plate, a first support member abutting against and supporting an upper surface of the filter, a second support member abutting against and supporting an lower surface of the filter, the first support member including, a disk-shaped portion and an annular wall portion, the disk-shaped portion provided with a plurality of communication holes formed only at a section in contact with the upper surface of the filter, one surface of the disk-shaped portion abutting against the top plate, the other surface of the disk-shaped portion abutting against the upper surface of the filter, the annular wall portion abutting against a part of an outer circumferential surface of the filter; the second support member including, a substantially cylindrical wall portion and an annular flat portion formed at a circumference in one end of the substantially cylindrical wall portion, and the substantially cylindrical wall portion being fixed to the housing, the annular flat portion abutting against the lower surface of the filter, and, during actuation, a gap being formed between the top plate and the first support member; and
a gap being formed between the upper circumferential wall plate and the first support member,when a pressure inside the combustion chamber increases due to combustion gas generated by combustion of the gas generating agent and the top plate of the diffuser shell is deformed. - View Dependent Claims (2, 3, 4, 5)
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6. A gas generator comprising:
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a diffuser shell which has a top plate and an upper circumferential wall plate provided with a gas discharge port, a closure shell which has a bottom plate and a lower circumferential wall plate, a housing, as an outer shell, obtained by joining and integrating only the upper circumferential wall plate and the lower circumferential wall plate, in the housing, an ignition device chamber defined by a cup-shaped container which accommodates an ignition device, a combustion chamber defined to surround the ignition device chamber and charged with a gas generating agent, an annular or flat-plate filter disposed to face the top plate and to be spaced from the upper circumferential wall plate, a single cup-shaped support member abutting against at least an upper surface of the filter to support the filter, the single cup-shaped support member having a disk-shaped portion and a cylindrical wall portion formed at the circumference of the disk-shaped portion and provided with a communication hole, the disk-shaped portion being provided with a plurality of communication holes formed only at a section in contact with an upper surface of the filter, one surface of the disk-shaped portion abutting against the top plate and the other surface of the disk-shaped portion abutting against the upper surface of the filter, and at least part of the cylindrical wall portion being arranged to abut against an outer circumference of the filter, an opening end of the cylindrical wall portion fixed to the housing, and, during actuation, a gap being formed between the top plate and the first support member; and
a gap being formed between the upper circumferential wall plate and the first support member, when a pressure inside the combustion chamber increases due to combustion gas generated by combustion of the gas generating agent and the top plate of the diffuser shell is deformed. - View Dependent Claims (7, 8, 9)
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Specification