초록 ▼

The present invention provides a gas generator for an air bag comprising: a housing having a gas discharge port; a plurality of combustion chambers charged with a gas generating agent, provided in the housing; a single ignition device chamber accommodating a single ignition device, provided in the

The present invention provides a gas generator for an air bag comprising: a housing having a gas discharge port; a plurality of combustion chambers charged with a gas generating agent, provided in the housing; a single ignition device chamber accommodating a single ignition device, provided in the housing, the single ignition device chamber communicating directly with each of the plurality of combustion chambers via communication holes, respectively; a combustion product generated by the activation of the single ignition device, passing through the communication holes, flowing into the respective combustion chambers to ignite and burn the gas generating agent charged into each combustion chamber; the amounts of combustion products flowing through the communication holes into the combustion chambers, respectively, being controlled, at least at the beginning of the activation, such that the amounts may be different from one another.

대표청구항 ▼

The invention claimed is: 1. A gas generator for an air bag comprising: a housing having a gas discharge port; a plurality of combustion chambers separated by a partitioning member into a first combustion chamber and a second combustion chamber and each combustion chamber charged with a gas generat

The invention claimed is: 1. A gas generator for an air bag comprising: a housing having a gas discharge port; a plurality of combustion chambers separated by a partitioning member into a first combustion chamber and a second combustion chamber and each combustion chamber charged with a gas generating agent, provided in the housing; a single ignition device chamber accommodating a single ignition device, provided in the housing, the single ignition device chamber communicating directly with each of the plurality of combustion chambers via communication holes, respectively; a combustion product generated by the activation of the single ignition device, passing through the communication holes, flowing into the respective combustion chambers to ignite and burn the gas generating agent charged into each combustion chamber; the amounts of combustion products flowing through the communication holes into the combustion chambers, respectively, being controlled, at least at the beginning of the activation, such that the amounts may be different from one another; the partitioning member maintaining combustion in the first combustion chamber in a completely partitioned state so that gas discharge is secured to the gas discharge port, and during combustion in the second combustion chamber a gas discharge path is secured from the second combustion chamber to the first combustion chamber to the gas discharge port. 2. The gas generator for an air bag according to claim 1, wherein the communication holes of each combustion chamber have a different total opening area, and the amount of combustion products flowing into the respective combustion chambers is controlled at least at the beginning of the activation by the difference in the respective total opening areas of the communication holes such that a different amount of combustion products flows into each combustion chamber. 3. The gas generator for an air bag according to claim 1, wherein the communication holes are sealed by a sealing member, and the amount of combustion products flowing into the respective combustion chambers is controlled at least at the beginning of the activation by a difference in respective rupturing pressures of the sealing members such that a different amount of combustion products flows into each combustion chamber. 4. The gas generator for an air bag according to claim 1 or claim 2, wherein the amounts of gas generated per unit time by the gas generating agents charged into the respective combustion chambers also differ from each other. 5. The gas generator for an air bag according to claim 1 or claim 2, wherein the partitioning member moves when a difference occurs in the combustion states of the plurality of combustion chambers, and as a result of the movement, a discharge path for discharging the gas that is generated in all of the combustion chambers is secured. 6. The gas generator for an air bag according to claim 1 or claim 2, wherein the ignition device comprises an electric igniter that is activated by an ignition current, and a transfer charge that is ignited and burned by an activation of the electric igniter to generate the combustion products, and the transfer charge is a gas generating agent having a gas output of not less than 1.2 mol/100 g. 7. A gas generator, comprising: a housing having a gas discharge port; a first combustion chamber provided within the housing and accommodating therein a first gas generating agent; a second combustion chamber provided within the housing and accommodating therein a second gas generating agent; a single ignition device chamber provided within the housing, the single ignition device chamber including a first communication hole communicating the single ignition device chamber with the first combustion chamber and a second communication hole communicating the single ignition device chamber with the second combustion chamber; a single ignition device accommodated in the single ignition device chamber and generating a combustion product by combustion thereof, a portion of the combustion product flowing into the first combustion chamber through the first communication hole to ignite the first gas generating agent and the rest of the combustion product flowing into the second combustion chamber through the second communication hole to ignite the second gas generating agent such that an amount of the portion of the combustion product is different from an amount of the rest of the combustion product at least at the beginning of an activation of the gas generator; and wherein the first combustion chamber and the second combustion chamber are partitioned by a partitioning member, the partitioning member moves when a difference occurs in the combustion states of the first combustion chamber and the second combustion chamber, and as a result of the movement, a discharge path for discharging the as that is generated in all of the combustion chambers is secured. 8. A gas generator according to claim 7, wherein the first communication hole and the second communication hole have a different total opening area by which the amount of the portion of the combustion product and the amount of the rest of the combustion product are controlled. 9. A gas generator according to claim 7, wherein the first communication hole and the second communication hole are sealed by a sealing member which have a different rupturing pressure, respectively, by which the amount of the portion of the combustion product and the amount of the rest of the combustion product are controlled. 10. A gas generator according to claim 7, wherein an amount of gas generated per unit time by the first gas generating agent and an amount of gas generated per unit time by the second gas generating agent are different from each other.