Gas generator for air bag
First Claim
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1. A gas generator for an air bag, comprising:
- a housing having a gas discharge port;
an inner cylinder provided inside the housing and defining therein an ignition means chamber, in which ignition means are accommodated, and a combustion chamber, in which a gas generating agent is accommodated, and separated from the ignition means chamber, the inner cylinder being provided with a first through hole that allows only the ignition means chamber to communicate with a chamber outside the inner cylinder, and a second through hole that allows only the combustion chamber to communicate with the chamber outside the inner cylinder;
a cylindrical coolant/filter disposed within the chamber outside the inner cylinder, and between the combustion chamber and the gas discharge port so that combustion gas passes through the coolant/filter prior to discharge through the gas discharge port,a retainer including a lower peripheral wall, an upper peripheral wall, and an annular plane connecting the lower peripheral wall and the upper peripheral wall, the retainer being provided such that,the lower peripheral wall opposes the first through hole and makes a direct contact with an inner circumferential wall extending between a ceiling surface and a base surface of the housing,the annular plane supporting a lower end surface of the cylindrical coolant/filter, andthe upper peripheral wall opposes the second through hole and the gas discharge port,wherein a first gap is defined between the cylindrical coolant/filter and the upper peripheral wall, and a second gap is defined between the cylindrical coolant/filter and the inner circumferential wall of the housing, the first gap and the second gap are provided between the upper peripheral wall and the gas discharge port.
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Abstract
The air bag gas generator comprises a housing having a gas discharge port, an ignition unit chamber in which ignition units are accommodated, and a combustion chamber in which a gas generating agent is accommodated, a cylindrical coolant/filter disposed between the combustion chamber and the gas discharge port, so that combustion gas passes through the coolant/filter prior to discharge through the gas discharge port, and the air bag gas generator meeting the following requirements (a), (b), and (c):
(a) that the gas generating agent has an amount of heat generation of 10 to 30 kcal/mol;
(b) that the mass (g) of the coolant/filter in relation to 1 mol of gas generated during combustion of the gas generating agent be 20 to 65 g/mol; and
(c) that the coolant/filter has a thickness of not less than 4.0 mm.
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Citations
13 Claims
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1. A gas generator for an air bag, comprising:
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a housing having a gas discharge port; an inner cylinder provided inside the housing and defining therein an ignition means chamber, in which ignition means are accommodated, and a combustion chamber, in which a gas generating agent is accommodated, and separated from the ignition means chamber, the inner cylinder being provided with a first through hole that allows only the ignition means chamber to communicate with a chamber outside the inner cylinder, and a second through hole that allows only the combustion chamber to communicate with the chamber outside the inner cylinder; a cylindrical coolant/filter disposed within the chamber outside the inner cylinder, and between the combustion chamber and the gas discharge port so that combustion gas passes through the coolant/filter prior to discharge through the gas discharge port, a retainer including a lower peripheral wall, an upper peripheral wall, and an annular plane connecting the lower peripheral wall and the upper peripheral wall, the retainer being provided such that, the lower peripheral wall opposes the first through hole and makes a direct contact with an inner circumferential wall extending between a ceiling surface and a base surface of the housing, the annular plane supporting a lower end surface of the cylindrical coolant/filter, and the upper peripheral wall opposes the second through hole and the gas discharge port, wherein a first gap is defined between the cylindrical coolant/filter and the upper peripheral wall, and a second gap is defined between the cylindrical coolant/filter and the inner circumferential wall of the housing, the first gap and the second gap are provided between the upper peripheral wall and the gas discharge port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification
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Current AssigneeDaicel Chemical Industries Limited (Daicel Corporation)
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Original AssigneeDaicel Chemical Industries Limited (Daicel Corporation)
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InventorsOkuyama, Takashi, Matsuda, Naoki, Hanano, Teppei
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Primary Examiner(s)Dickson; Paul N.
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Assistant Examiner(s)Wilhelm; Timothy
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Application NumberUS11/199,148Publication NumberTime in Patent Office1,624 DaysField of Search280/736, 280/741, 280/742, 280/740, 102/531US Class Current280/736CPC Class CodesB60R 2021/2633 with a plurality of inflati...B60R 2021/2648 comprising a plurality of c...B60R 21/2644 using only solid reacting s...C06D 5/06 by reaction of two or more ...
