Gas generator for multi-stage air bag
First Claim
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1. A multistage gas generator for an air bag, comprising:
- a cylindrical housing having at least one first gas discharging port and at least one second gas discharging port;
a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes, both end portions of the first inner cylindrical member being in contact with the cylindrical housing;
a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame transferring holes, both end portions of the second inner cylindrical member being in contact with the cylindrical housing;
a first combustion chamber provided inside the cylindrical housing and accommodating a first gas generating agent therein;
a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing and accommodating a second gas generating agent therein, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the at least one first gas discharging port and a second gas generated inside the second combustion chamber is discharged only through the at least one second gas discharging port;
first igniting means adapted to ignite the first gas generating agent accommodated inside the first combustion chamber; and
second igniting means adapted to ignite the second gas generating agent accommodated inside the second combustion chamber.
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Abstract
A multistage type gas generator for an air bag, which has a simple structure and can be easily manufactured and in which combustions of gas generating agents provided in a plurality of combustion chambers do not influence each other, is provided. In the multistage type gas generator, a plurality of the combustion chambers are provided in an axial direction of a cylindrical housing.
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Citations
67 Claims
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1. A multistage gas generator for an air bag, comprising:
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a cylindrical housing having at least one first gas discharging port and at least one second gas discharging port; a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes, both end portions of the first inner cylindrical member being in contact with the cylindrical housing; a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame transferring holes, both end portions of the second inner cylindrical member being in contact with the cylindrical housing; a first combustion chamber provided inside the cylindrical housing and accommodating a first gas generating agent therein; a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing and accommodating a second gas generating agent therein, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the at least one first gas discharging port and a second gas generated inside the second combustion chamber is discharged only through the at least one second gas discharging port; first igniting means adapted to ignite the first gas generating agent accommodated inside the first combustion chamber; and second igniting means adapted to ignite the second gas generating agent accommodated inside the second combustion chamber. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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2. A multistage gas generator for an air bag, comprising:
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a cylindrical housing having a plurality of first gas discharging ports provided in an upper half of the cylindrical housing, and a plurality of second gas discharging ports provided in a lower half of the cylindrical housing; a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes, both end portions of the first inner cylindrical member being in contact with the cylindrical housing; a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame transferring holes, both end portions of the second inner cylindrical member being in contact with the cylindrical housing; a first combustion chamber provided inside the cylindrical housing and accommodating a first gas generating agent therein; a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing and accommodating a second gas generating agent therein, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the first gas discharging ports and a second gas generated inside the second combustion chamber is discharged only through the second gas discharging ports; first igniting means adapted to ignite the first gas generating agent accommodated inside the first combustion chamber; and second igniting means adapted to ignite the second gas generating agent accommodated inside the second combustion chamber.
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17. A multistage gas generator for an air bag, comprising:
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a cylindrical housing having at least one first gas discharging port and at least one second gas discharging port; a first combustion chamber provided inside the cylindrical housing; a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the at least one first gas discharging port and a second gas generated inside the second combustion chamber is discharged only through the at least one second gas discharging port; a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes, both end portions of the first inner cylindrical member being in contact with the cylindrical housing; a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame transferring holes, both end portions of the second inner cylindrical member being in contact with the cylindrical housing; first igniting means accommodated in an inner space of the first inner cylindrical member; second igniting means accommodated in an inner space of the second inner cylindrical member; first gas generating means accommodated inside the first combustion chamber and adapted to be ignited and burnt by the first igniting means; and second gas generating means accommodated inside the second combustion chamber and adapted to be ignited and burnt by the second igniting means. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A multistage gas generator for an air bag, comprising:
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a cylindrical housing having a at least one first gas discharging port and at least one second gas discharging port; a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes, both end portions of the first inner cylindrical member being in contact with the cylindrical housing; a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame transferring holes, both end portions of the second inner cylindrical member being in contact with the cylindrical housing; a first combustion chamber provided inside the cylindrical housing; a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the at least one first gas discharging port and a second gas generated inside the second combustion chamber is discharged only through the at least one second gas discharging port; first igniting means accommodated inside the first combustion chamber; second igniting means accommodated inside the second combustion chamber; a first gas generating means accommodated inside the first combustion chamber and adapted to be ignited and burnt by the first igniting means; second gas generating means accommodated inside the second combustion chamber and adapted to be ignited and burnt by the second igniting means; first cylindrical filter means for one of purifying and cooling a first gas generated by combustion of the first gas generating means, the first cylindrical filter means surrounding the first combustion chamber; and second cylindrical filter means for one of purifying and cooling the second gas generated by combustion of the second gas generating means, the second cylindrical filter means surrounding the second combustion chamber. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A multistage gas generator for an air bag, comprising:
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a cylindrical housing including a cylindrical diffuser shell having a top wall, and a peripheral wall provided with at least one first gas discharging port and at least one second gas discharging port, and a closure shell which closes an open end of the diffuser shell; a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes, a first end portion of the first inner cylindrical member being in contact with the diffuser shell and a second end portion being in contact with the closure shell; a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame transferring holes, a first end portion of the second inner cylindrical member being in contact with the diffuser shell and a second end portion being in contact with the closure shell; a first combustion chamber provided inside the cylindrical housing; a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the at least one first gas discharging port and a second gas generated inside the second combustion chamber is discharged only through the at least one second gas discharging port, an inner diameter of the first combustion chamber provided nearest to the closure shell in the cylindrical housing being equal to or larger than a diameter of the second combustion chamber; first igniting means actuated by a first actuation signal; a second igniting means actuated by a second actuation signal; first gas generating means accommodated inside the first combustion chamber and adapted to be ignited and burnt by the first igniting means; and second gas generating means accommodated inside the second combustion chamber and adapted to be ignited and burnt by the second igniting means. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48)
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49. A multistage gas generator for an air bag, comprising:
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a cylindrical housing having at least one first gas discharging port and at least one second gas discharging port; a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes, both end portions of the first inner cylindrical member being in contact with the cylindrical housing; a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame transferring holes, both end portions of the second inner cylindrical member being in contact with the cylindrical housing; a first combustion chamber provided inside the cylindrical housing; a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the at least one first gas discharging port and a second gas generated inside the second combustion chamber is discharged only through the at least one second gas discharging port; first igniting means adapted to be actuated by a first actuation signal; second igniting means adapted to be actuated by a second actuation signal; first gas generating means accommodated inside the first combustion chamber and adapted to be ignited and burnt by the first igniting means; second gas generating means accommodated inside the second combustion chamber and adapted to be ignited and burnt by the second igniting means; and at least one of a heat insulating member and a heat insulating space which blocks conduction of a combustion heat from one of the first combustion chamber and the second combustion chamber to the other of the first combustion chamber and the second combustion chamber. - View Dependent Claims (50, 51, 52, 53, 54, 55)
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56. A multistage gas generator for an air bag, comprising:
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a cylindrical housing having at least one first gas discharging port and at least one second gas discharging port; a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes, both end portions of the first inner cylindrical member being in contact with the cylindrical housing; a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame transferring holes, both end portions of the second inner cylindrical member being in contact with the cylindrical housing; a first combustion chamber provided inside the cylindrical housing; a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the at least one first gas discharging port and a second gas generated inside the second combustion chamber is discharged only through the at least one second gas discharging port; first igniting means actuated by a first actuation signal and disposed on a first side of the cylindrical housing; second igniting means actuated by a second actuation signal and disposed on the first side of the cylindrical housing; first gas generating means accommodated inside the first combustion chamber and adapted to be ignited and burnt by the first igniting means; and second gas generating means accommodated inside the second combustion chamber and adapted to be ignited and burnt by the second igniting means. - View Dependent Claims (59, 60, 61)
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57. A multistage gas generator for an air bag, comprising:
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a cylindrical housing having at least one first gas discharging port and at least one second gas discharging port; a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes, both end portions of the first inner cylindrical member being in contact with the cylindrical housing; a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame transferring holes, both end portions of the second inner cylindrical member being in contact with the cylindrical housing; a first combustion chamber provided inside the cylindrical housing; a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the at least one first gas discharging port and a second gas generated inside the second combustion chamber is discharged only through the at least one second gas discharging port; first igniting means actuated by a first actuation signal and disposed on a first plane of the cylindrical housing; second igniting means actuated by a second actuation signal and disposed on the first plane of the cylindrical housing; first gas generating means accommodated inside the first combustion chamber and adapted to be ignited and burnt by the first igniting means; and second gas generating means accommodated inside the second combustion chamber and adapted to be ignited and burnt by the second igniting means.
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58. A multistage gas generator for an air bag, comprising:
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a cylindrical housing including a cylindrical diffuser shell having a top wall, and a peripheral wall provided with at least one first gas discharging port and at least one second gas discharging port, and a closure shell which closes a lower opening of the diffuser shell; a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes, a first end portion of the first inner cylindrical member being in contact with the diffuser shell and a second end portion being in contact with the closure shell; a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame transferring holes, a first end portion of the second inner cylindrical member being in contact with the diffuser shell and a second end portion being in contact with the closure shell; a first combustion chamber provided inside the cylindrical housing; a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the at least one first gas discharging port and a second gas generated inside the second combustion chamber is discharged only through the at least one second gas discharging port, an inner diameter of the first combustion chamber provided nearest to the closure shell in the cylindrical housing being equal to or larger than a diameter of the second combustion chamber; first igniting means adapted to be actuated by a first actuation signal; second igniting means adapted to be actuated by a second actuation signal; first gas generating means accommodated inside the first combustion chamber and adapted to be ignited and burnt by the first igniting means, the first gas generating means being arranged on a side closer to the top wall than the closure shell; second gas generating means accommodated inside the second combustion chamber and adapted to be ignited and burnt by the second igniting means, the second gas generating means being arranged on a side closer to the closure shell than the top wall.
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62. A multistage gas generator for an air bag, comprising:
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a cylindrical housing having at least one first gas discharging port and at least one second gas discharging port; a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes, both end portions of the first inner cylindrical member being in contact with the cylindrical housing; a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame transferring holes, both end portions of the second inner cylindrical member being in contact with the cylindrical housing; a first combustion chamber provided inside the cylindrical housing; a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the at least one first gas discharging port and a second gas generated inside the second combustion chamber is discharged only through the at least one second gas discharging port; a partition wall made of a plate member that separates the first combustion chamber and the second combustion chamber; first igniting means actuated by a first actuation signal; second igniting means actuated by a second actuation signal; first gas generating means accommodated inside the first combustion chamber and adapted to be ignited and burnt by the first igniting means; and second gas generating means accommodated inside the second combustion chamber and adapted to be ignited and burnt by the second igniting means. - View Dependent Claims (63, 64)
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65. A multistage gas generator for an air bag, comprising:
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a cylindrical housing having at least one first gas discharging port and at least one second gas discharging port; a first combustion chamber provided inside the cylindrical housing and accommodating a first gas generating agent therein; a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing and accommodating a second gas generating agent therein, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the at least one first gas discharging port and a second gas generated inside the second combustion chamber is discharged only through the at least one second gas discharging port; a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes that allow communication between an interior of the first cylindrical member and the first combustion chamber; and a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame-transferring holes that allow communication between an interior of the second cylindrical member and the second combustion chamber, wherein flames are discharged through at least one of the first flame-transferring holes, wherein the directions of the flames are controlled by not providing said at least one of the first flame-transferring holes and the second flame-transferring holes at a position directly opposing a portion of an inner surface of the cylindrical housing, and wherein the directions of the flames are controlled by providing a wall between at least one of the first inner cylindrical member and the second inner cylindrical member and a portion of an inner surface of the cylindrical housing. - View Dependent Claims (66, 67)
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Specification