GAS GENERATOR

• US 20110239891A1
• Filed: 03/29/2011
• Published: 10/06/2011
• Est. Priority Date: 03/30/2010
• Status: Active Grant

• Current Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Original Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Inventors: NAKAYASU, Masayuki
• Granted Patent: US 8,382,155 B2
• Time in Patent Office: Days
• US Class Current: 102/530
• 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

Abstract

The present invention provides a gas generator including: a housing having a gas discharge port and a first combustion chamber defined in the housing charged with a first gas generating agent, an ignition chamber cup defining an ignition chamber and a second combustion chamber cup defining a second combustion chamber being aligned at a distance in the radial direction, a first communication hole for communicating with the first combustion chamber being provided in a circumferential wall portion of the ignition chamber cup, a second communication hole, for communicating with the first combustion chamber being provided in a circumferential wall portion of the second combustion chamber cup, a cup-shaped cover member covering the second combustion chamber cup and closing the second communication hole, a disk-shaped retainer for retaining the first gas generating agent, being disposed in the housing and provided with a first opening and a second opening, the disk-shaped retainer being mounted by fitting the first opening to the ignition chamber cup and putting the second combustion chamber cup through the second opening, an annular gap being formed between the second opening and the cover member covering the second combustion chamber cup.

Claims

1. A gas generator comprising:

a housing (11) formed by a diffuser shell (12) having a gas discharge port (14) and a closure shell (13), a first combustion chamber (31) defined in the housing (11) and a first gas generating agent (33) charged in the first combustion chamber,

in the first combustion chamber (31), an ignition chamber cup (32) defining an ignition chamber (30) and a second combustion chamber cup (41) defining a second combustion chamber (40) being aligned at a distance in the radial direction,

a first igniter (21) being accommodated in the ignition chamber (30) inside the ignition chamber cup (32), a first communication hole (34), for causing communication with the first combustion chamber (31) at the time of actuation, being provided in a circumferential wall portion (32c) of the ignition chamber cup (32),

a second igniter (25) and a second gas generating agent (43) being accommodated in the second combustion chamber (40) inside the second combustion chamber cup (41), a second communication hole (42), for causing communication with the first combustion chamber (31) at the time of activation, being provided in a circumferential wall portion (41c) of the second combustion chamber cup (41),

a cup-shaped cover member (50) covering the second combustion chamber cup (41) and closing the second communication hole (42),

a disk-shaped retainer (60), for retaining the first gas generating agent (33), being disposed in the housing (11) and provided with a first opening (62) and a second opening (63),

the disk-shaped retainer (60) being mounted by fitting the ignition chamber cup (32) through the first opening (62) and putting the second combustion chamber cup (41) through the second opening (63), and an annular gap (70) being formed between the second opening (63) and the cover member (50) covering the second combustion chamber cup (41).

2. A gas generator according to claim 1, wherein

the cover member has a cut (55) formed on an opening (52) thereof, and

the cut is formed on a surface that is opposite to a surface where the cover member abuts against the second communication hole.

3. A gas generator according to claim 1, wherein

the disk-shaped retainer includes a first annular wall (64) formed at a periphery of the first opening, and an inner circumferential surface of the first annular wall is fixed by being in press-contact with an outer surface of the circumferential wall portion of the ignition chamber cup.

4. A gas generator according to claim 1, wherein

the disk-shaped retainer includes the first annular wall formed at a periphery of the first opening, and an inner circumferential surface of the first annular wall is fixed by being in press-contact with an outer surface of the circumferential wall portion of the ignition chamber cup, and

the first annular wall is formed to extend to a diffuser shell side and so that an inner diameter thereof becomes smaller toward the diffuser shell side, and further includes notches (170) formed in a circumferential direction at intervals.