Gas generator for air bag and air bag device
First Claim
Patent Images
1. A gas generator for an air bag, comprising:
- a cylindrical housing having a gas discharging port;
an inner cylindrical member disposed inside the cylindrical housing;
ignition means disposed inside the inner cylindrical member; and
a first combustion chamber provided outside the inner cylindrical member to accommodate a first gas generating agent;
a retainer provided inside the housing and extending from the inner cylindrical member in a radial direction of the gas generator without making contact with the housing, the retainer being provided with a partition wall surface that defines an average length of the first combustion chamber in an axial direction of the gas generator; and
a partition wall that divides an inside of the inner cylindrical member into an ignition means accommodating chamber and a second combustion chamber that accommodates a second gas generating agent,wherein, a ratio (D/L) of an average distance (D) in a radial direction of the first combustion chamber to the average length (L) is in a range of 0.2 to 2.0, andwherein a gas generated by the second gas generating agent is discharged from the gas discharge port without passing through the first combustion chamber.
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Accused Products
Abstract
A gas generator has an inner cylindrical member disposed in a cylindrical housing, an annular first combustion chamber provided radially in the outside of the inner cylindrical member, and, in the combustion chamber, a ratio of its radial average distance to its axial average length is adjusted to be in the range of 0.2 to 2.0. The gas generator has a retainer which changes a flow of a gas ejected from a through-hole in the inner cylindrical member and has a cylindrical portion for collecting fluid and semifluid combustion products included in the gas.
19 Citations
27 Claims
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1. A gas generator for an air bag, comprising:
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a cylindrical housing having a gas discharging port; an inner cylindrical member disposed inside the cylindrical housing; ignition means disposed inside the inner cylindrical member; and a first combustion chamber provided outside the inner cylindrical member to accommodate a first gas generating agent; a retainer provided inside the housing and extending from the inner cylindrical member in a radial direction of the gas generator without making contact with the housing, the retainer being provided with a partition wall surface that defines an average length of the first combustion chamber in an axial direction of the gas generator; and a partition wall that divides an inside of the inner cylindrical member into an ignition means accommodating chamber and a second combustion chamber that accommodates a second gas generating agent, wherein, a ratio (D/L) of an average distance (D) in a radial direction of the first combustion chamber to the average length (L) is in a range of 0.2 to 2.0, and wherein a gas generated by the second gas generating agent is discharged from the gas discharge port without passing through the first combustion chamber. - View Dependent Claims (2)
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3. A retainer for a gas generator for an air bag, the gas generator including a cylindrical housing having a gas discharging port, an inner cylindrical member provided inside the cylindrical housing and having a cylindrical peripheral wall provided with a through-hole, and at least one of ignition means and a gas generating agent being disposed inside the inner cylindrical member, the retainer comprising:
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a cylindrical portion adapted to be positioned with a distance from an outer peripheral surface of the cylindrical peripheral wall and to face the outer peripheral surface, a flange-shaped partition wall portion integrally formed with the cylindrical portion, and at least one of the cylindrical portion and the partition wall portion being adapted to change a flow of a gas ejected from the through-hole formed in the cylindrical peripheral wall and adapted to collect combustion products other than gaseous material included in the gas, wherein the retainer is adapted to be provided inside the housing and extending from the inner cylindrical member in a radial direction of the gas generator without making contact with the housing. - View Dependent Claims (4, 5, 6, 7)
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8. A gas generator for an air bag, comprising:
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a cylindrical housing having a gas discharging port; an inner cylindrical member having a cylindrical peripheral wall provided with a through-hole; at least one of ignition means and a first gas generating agent disposed in the inner cylindrical member; and a retainer provided inside the housing and extending from the inner cylindrical member in a radial direction of the gas generator without making contact with the housing, the retainer having a cylindrical portion surrounding a part of the inner cylindrical member and a flange-shaped partition wall portion integrally formed on the cylindrical portion, disposed outside the inner cylindrical member, wherein the cylindrical portion of the retainer is positioned with a distance from an outer peripheral surface of the cylindrical peripheral wall and faces the outer peripheral surface, and at least one of the cylindrical portion and the peripheral wall changes flow of a gas ejected from a through-hole formed in the cylindrical peripheral wall of the inner cylindrical member and collects combustion products other than gaseous material included in the gas. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A gas generator for an air bag, comprising:
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a housing having a gas discharging port; an inner cylindrical member provided inside the housing and having a cylindrical peripheral wall; a first combustion chamber and a second combustion chamber separated by the inner cylindrical member; gas generating agents charged in the first combustion chamber and the second combustion chamber; a retainer defining the first combustion chamber and a flow-path for directing a gas generated in the second combustion chamber towards the gas discharging port; a first coolant provided inside the first combustion chamber; and a second coolant provided inside the flow-path.
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22. A gas generator for an air bag, comprising:
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a housing having a gas discharging port; an inner cylindrical member provided inside the housing and having a cylindrical peripheral wall; two combustion chambers defined by the inner cylindrical member; and gas generating agents adapted to be burnt for generating a working gas being charged in the respective combustion chambers, wherein, working gases generated in the respective combustion chambers pass through different flow-paths and reach the gas discharging port, and wherein, the working gases generated in the respective combustion chambers pass through different coolant means to reach the gas discharging port.
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23. A gas generator for an air bag, comprising:
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a housing having a gas discharging port; an inner cylindrical member provided inside the housing and having a cylindrical peripheral wall; a first combustion chamber and a second combustion chamber separated by the inner cylindrical member; gas generating agents adapted to be charged in the first combustion chamber and the second combustion chamber; and a retainer defining a first flow-path for a gas generated in the first combustion chamber and a second flow-path for a gas generated in the second combustion chamber, the second flow-path being substantially independent from the first flow-path, wherein the inside of the inner cylindrical member is divided into an ignition means accommodating chamber and the second combustion chamber by a partition wall, and the retainer collects combustion products other than gaseous material generated by combustion of the second gas generating agent.
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24. A gas generator for an air bag, comprising:
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a housing having a gas discharging port; an inner cylindrical member provided inside the housing and having a cylindrical peripheral wall; a first combustion chamber and a second combustion chamber separated by the inner cylindrical member; gas generating agents charged in the first combustion chamber and the second combustion chamber; a retainer defining the first combustion chamber and a flow-path for directing a gas generated in the second combustion chamber towards the gas discharging port; wherein the inside of the inner cylindrical member is divided into an ignition means accommodating chamber and a second combustion chamber by a partition wall, and the retainer collects combustion products other than gaseous material generated by combustion of the second gas generating agent.
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25. A gas generator for an air bag, comprising:
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a cylindrical housing having a gas discharging port; an inner cylindrical member having a cylindrical peripheral wall provided with a through-hole; at least one of an ignition means and a first gas generating agent disposed in the inner cylindrical member; a retainer having a cylindrical portion surrounding a part of the inner cylindrical member and a flange-shaped partition wall portion integrally formed on the cylindrical portion, disposed outside the inner cylindrical member; and a first combustion chamber for accommodating a second gas generating agent radially provided outside the inner cylindrical member, wherein the cylindrical portion of the retainer is positioned with a distance from an outer peripheral surface of the cylindrical peripheral wall and faces the outer peripheral surface, and at least one of the cylindrical portion and the peripheral wall changes flow of a gas ejected from a through-hole formed in the cylindrical peripheral wall of the inner cylindrical member and collects combustion products other than gaseous material included in the gas, and wherein a peripheral wall of the retainer has a shape and size that defines at least an axial end of the first combustion chamber and is provided on the axial end of the first combustion chamber.
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26. A gas generator for an air bag, comprising:
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a cylindrical housing having a gas discharging port; an inner cylindrical member having a cylindrical peripheral wall provided with a through-hole; at least one of an ignition means and a gas generating agent disposed in the inner cylindrical member; and a retainer having a cylindrical portion surrounding a part of the inner cylindrical member and a flange-shaped partition wall portion integrally formed on the cylindrical portion, disposed outside the inner cylindrical member, wherein the cylindrical portion of the retainer is positioned with a distance from an outer peripheral surface of the cylindrical peripheral wall and faces the outer peripheral surface, and at least one of the cylindrical portion and the peripheral wall changes flow of a gas ejected from a through-hole formed in the cylindrical peripheral wall of the inner cylindrical member and collects combustion products other than gaseous material included in the gas, and wherein, inside of the inner cylindrical member, an ignition means accommodating chamber and a combustion chamber are defined adjacent to each other in an axial direction of the gas generator by a partition wall, and a communication hole of the inner cylindrical member is open at the combustion chamber.
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27. A gas generator for an air bag, comprising:
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a cylindrical housing having a gas discharging port; an inner cylindrical member having a cylindrical peripheral wall provided with a through-hole; at least one of an ignition means and a gas generating agent disposed in the inner cylindrical member; and a retainer having a cylindrical portion surrounding a part of the inner cylindrical member and a flange-shaped partition wall portion integrally formed on the cylindrical portion, disposed outside the inner cylindrical member, wherein the cylindrical portion of the retainer is positioned with a distance from an outer peripheral surface of the cylindrical peripheral wall and faces the outer peripheral surface, and at least one of the cylindrical portion and the peripheral wall changes flow of a gas ejected from a through-hole formed in the cylindrical peripheral wall of the inner cylindrical member and collects combustion products other than gaseous material included in the gas, and wherein the inside of the inner cylindrical member is divided into an ignition means accommodating chamber and a combustion chamber by a partition wall, and the retainer collects the combustion products other than the gaseous material generated by combustion of the gas generating agent.
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Specification