Gas generator for air bag

• US 20040144281A1
• Filed: 12/08/2003
• Published: 07/29/2004
• Est. Priority Date: 12/09/2002
• Status: Active Grant

• Current Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Original Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Inventors: Matsuda, Naoki, Hirooka, Masato
• Granted Patent: US 7,467,588 B2
• Time in Patent Office: Days
• US Class Current: 102/430
• CPC Class Codes: B60R 2021/2633 with a plurality of inflation levels
• CPC Class Codes: B60R 2021/2648 comprising a plurality of combustion chambers or sub-chambers
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder
• CPC Class Codes: C06C 9/00 Chemical contact igniters; Chemical lighters
• CPC Class Codes: C06D 5/06 by reaction of two or more solids

Abstract

The present invention provides a gas generator for an air bag in which an operating performance is excellent and an amount of NOx to be generated is reduced. The gas generator for an air bag comprises a housing having a gas discharging hole, an ignition means activated by an impact, and a combustion chamber accommodating a gas generating agent (its combustion temperature is 1000 to 3000° C.) which is ignited and burnt to generate a combustion gas, wherein the ignition means includes an igniter and a transfer charge, the transfer charge is a mixture of transfer charge powder (mixture powder of boron and niter) and gas generating agent molded article, and the gas generating agent molded article generates a gas of 1.2 moles/100 g or more.

Claims

1. A gas generator for an air bag comprising a housing having a gas discharging hole, an ignition means activated by an impact, and a combustion chamber accommodating a gas generating agent which is ignited and burnt to generate a combustion gas, wherein

the ignition means includes an igniter and a transfer charge, the transfer charge is a mixture of transfer charge powder and gas generating agent molded article, and the gas generating agent molded article generates a gas of 1.2 moles/100 g or more.

2. A gas generator for an air bag according to claim 1, wherein the housing includes two ignition means therein, each of the two ignition means includes an igniter and a transfer charge, when the two igniters are activated with time difference, a second transfer charge combined with a second igniter which is activated with delay comprises only a gas generating agent molded article.

3. A gas generator for an air bag according to claim 1, wherein the transfer charge is a mixture of boron and niter.

4. A gas generator for an air bag according to claim 1, wherein a combustion temperature of a gas generating agent in the combustion chamber for inflating the air bag is 1000 to 1700°

C.

5. A gas generator for the an bag according to claim 1, wherein a combustion temperature of a gas generating agent molded article used as the transfer charge is 1000 to 3000°

C.

6. A gas generator for an air bag according to claim 2, wherein a combustion temperature of a gas generating agent molded article used as the transfer charge is 1700 to 3000°

C.

7. A gas generator for an air bag according to claim 4, wherein a gas generating agent in the combustion chamber includes guanidine nitrate and basic copper nitrate.