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 ignition means chamber accommodating therein ignition means activated by an impact;
a combustion chamber accommodating therein a gas generating agent ignited and burnt to generate a combustion gas;
a cylindrical filter disposed between the combustion chamber and the gas discharge port, in which the combustion gas passes through the filter and is discharged from the gas discharge port; and
an inner cylindrical shielding plate disposed inside the cylindrical filter,wherein, the inner cylindrical shielding plate is disposed such that its lower end opening peripheral edge is in contact with a housing bottom surface and defines an opening between an upper end of the inner cylindrical shielding plate and a ceiling of the housing that allows the combustion gas to flow from the combustion chamber to the cylindrical filter, and a gap is provided between an inner peripheral surface of the cylindrical filter and an outer peripheral surface of the inner cylindrical shielding plate.
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Accused Products
Abstract
A gas generator for an air bag includes a filter having excellent cooling effect. A gas flow as illustrated in the drawings is formed by effect of the inner cylindrical shielding plate 66, the outer cylindrical shielding plate 67, the first gap 71 and the second gap 72, which sandwich a cylindrical filter 65 for cooling a combustion gas from the both side. Thus, the cooling effect of the combustion gas is enhanced.
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Citations
14 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 ignition means chamber accommodating therein ignition means activated by an impact; a combustion chamber accommodating therein a gas generating agent ignited and burnt to generate a combustion gas; a cylindrical filter disposed between the combustion chamber and the gas discharge port, in which the combustion gas passes through the filter and is discharged from the gas discharge port; and an inner cylindrical shielding plate disposed inside the cylindrical filter, wherein, the inner cylindrical shielding plate is disposed such that its lower end opening peripheral edge is in contact with a housing bottom surface and defines an opening between an upper end of the inner cylindrical shielding plate and a ceiling of the housing that allows the combustion gas to flow from the combustion chamber to the cylindrical filter, and a gap is provided between an inner peripheral surface of the cylindrical filter and an outer peripheral surface of the inner cylindrical shielding plate. - View Dependent Claims (3, 8, 11, 12, 13, 14)
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2. A gas generator for an air bag, comprising:
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a housing having a gas discharge port; an ignition means chamber accommodating therein ignition means activated by an impact; a combustion chamber accommodating therein a gas generating agent ignited and burnt to generate a combustion gas; a cylindrical filter disposed between the combustion chamber and the gas discharge port, in which the combustion gas passes through the filter and is discharged from the gas discharge port; and an inner cylindrical shielding plate and an outer cylindrical shielding plate respectively disposed inside and outside the cylindrical filter, wherein, the inner cylindrical shielding plate is disposed such that its lower end opening peripheral edge is in contact with a housing bottom surface and defines, between an upper end opening peripheral edge of the inner cylindrical shielding plate and a housing ceiling surface, a portion having excellent air permeability is provided between an inner peripheral surface of the cylindrical filter and the inner cylindrical shielding plate, and wherein, the outer cylindrical shielding plate is disposed such that its upper end opening peripheral edge is in contact with the housing ceiling surface, a space is provided between the housing bottom surface and a lower end opening peripheral edge of the outer cylindrical shielding plate, and a gap is formed between the outer cylindrical shielding plate and a housing peripheral wall having the a gas discharge port. - View Dependent Claims (4)
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5. A gas generator for an air bag, comprising:
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a housing having a gas discharge port; an ignition means chamber accommodating therein ignition means activated by an impact; a combustion chamber accommodating therein a gas generating agent ignited and burnt to generate a combustion gas; a cylindrical filter disposed between the combustion chamber and the gas discharge port, in which the combustion gas passes through the filter and is discharged from the gas discharge port; an inner cylinder disposed in a central portion of the housing, the inner cylinder defining therein an ignition means chamber, the ignition means chamber and the combustion chamber being in communication with each other through a communication hole formed in a peripheral wall of the inner cylinder; an inner cylindrical shielding plate disposed inside the cylindrical filter, an upper end opening peripheral edge of the inner cylindrical shielding plate being in contact with a housing ceiling surface and a combustion gas pass between the lower end opening peripheral edge and a housing bottom surface, or the lower end opening peripheral edge of the inner cylindrical shielding plate being in with the housing bottom surface and the combustion gas pass between the upper end opening peripheral edge and the housing ceiling surface, a gap is provided between an inner peripheral surface of the cylindrical filter and an outer peripheral surface of the inner cylindrical shielding plate; and a communication hole formed in the peripheral wall of the inner cylinder and facing the inner cylindrical shielding plate. - View Dependent Claims (6, 7, 9, 10)
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Specification