Gas generator

• US 20070052224A1
• Filed: 09/01/2006
• Published: 03/08/2007
• Est. Priority Date: 09/05/2005
• Status: Abandoned Application

• Current Assignee: Daicel Chemical Industries Limited
• Original Assignee: Daicel Chemical Industries Limited
• Inventors: Nakayasu, Masayuki, Ueda, Masayuki
• Application Number:
  US11/514,107
• Publication Number:
  US 20070052224A1
• Time in Patent Office: Days
• US Class Current: 280/740
• CPC Class Codes: B60R 21/268 using instantaneous release of stored pressurised gas B60R21/26005 takes precedence
• CPC Class Codes: B60R 21/274 characterised by means to rupture or open the fluid source

Abstract

The present invention relates to gas generator for a restraining device of a vehicle, including a cylindrical housing having two opening portion, an ignition device chamber connected to one opening portion of the cylindrical housing, a diffuser portion connected to the other opening portion of the cylindrical housing and having a gas discharge port, a first blockage member blocking between the cylindrical housing and the ignition device chamber, a second blockage member blocking between the cylindrical housing and the diffuser portion, a pressurized gas charged inside the cylindrical housing, a rod, which breaks the second blockage member to open a path to the diffuser portion during activation, being disposed inside the cylindrical housing, the base portion of the rod being in contact with a wall surface near the first blockage member, a distal end portion of the rod being in contact with and supported by a retainer which is fitted into a position near the second blockage member, the distal end portion of the rod and the retainer being fixed by pressing against each other due to the distal end portion of the rod contacting and supported by the retainer, the base portion of the rod being fixed by pressing against the wall surface near the first blockage member because of the distal end portion of the rod and the retainer fixing to each other.

Claims

1. A gas generator for a restraining device of a vehicle, comprising:

a cylindrical housing having two opening portions,

an ignition device chamber connected to one opening portion of the cylindrical housing,

a diffuser portion connected to the other opening portion of the cylindrical housing and having a gas discharge port,

a first blockage member blocking between the cylindrical housing and the ignition device chamber,

a second blockage member blocking between the cylindrical housing and the diffuser portion,

a pressurized gas charged inside the cylindrical housing,

a rod disposed inside the cylindrical housing and breaking the second blockage member to open a path to the diffuser portion during activation, the rod including

a base portion being in contact with a wall surface near the first blockage member, and

a distal end portion being in contact with and supported by a retainer which is fitted into a position near the second blockage member, the distal end portion and the retainer being fixed by pressing against each other due to the distal end portion contacting and supported by the retainer, the base portion of the rod being fixed by pressing against the wall surface near the first blockage member due to the distal end portion of the rod and the retainer fixing to each other.

2. The gas generator for a restraining device according to claim 1, wherein

the retainer has at least one orifice or recess, and

the distal end portion of the rod is inserted into the orifice or recess of the retainer, whereby the distal end portion of the rod and the retainer are fixed by pressing against each other, and the distal end portion of the rod and the retainer are fixed to each other, whereby the base portion of the rod is pressed against and fixed to the wall surface in the vicinity of the first blockage member.

3. The gas generator for a restraining device according to claim 1, wherein

the rod has a shaft portion and a distal end portion, and the distal end portion of the rod has a reduced diameter portion having a diameter smaller than that of the shaft portion of the rod, and

the rod is inserted into the orifice or recess of the retainer so that only the reduced diameter portion protrudes toward the diffuser portion, and the remaining portion of the rod is pressed against the orifice or recess of the retainer, whereby the distal end portion of the rod and the retainer are fixed by being pressed against each other, and the distal end portion of the rod and the retainer are fixed to each other, whereby the base portion of the rod is pressed against and fixed to the wall surface in the vicinity of the first blockage member.

4. The gas generator for a restraining device according to claim 1, wherein the retainer has an annular frame portion, a plurality of rod-like support portions extending toward a center from a peripheral edge on one end side of the annular frame portion, and a central support portion formed by the plurality of support portions and having an orifice or a recess, wherein a circumferential surface of the annular frame portion is in contact with an inner wall surface of the cylindrical housing.

5. A gas generator for a restraining device of a vehicle, comprising:

a cylindrical housing having two opening portions,

an ignition device chamber connected to one opening portion of the cylindrical housing,

a diffuser portion connected to the other opening portion and having a gas discharge port,

a first channel being formed between the cylindrical housing and the ignition device chamber and blocked by a first blockage member,

a second channel being formed between the cylindrical housing and the diffuser portion and blocked by a second blockage member,

a pressurized gas being charged inside the cylindrical housing,

a rod being disposed inside the cylindrical housing and breaking the second blockage member to open a path to the diffuser portion during activation, the rod including,

a base portion being in contact with a wall surface near the first blockage member, and

a distal end portion being in contact with and supported by a retainer which is fitted into a position near the second blockage member,

a retainer including an annular flame portion abutting against an inner circumferential surface of the cylindrical housing, and a central support portion abutting against the distal end portion of the rod, and a rod-like support portion connecting the annular flame portion with the central support portion,

the rod being, fixed in a state of contacting the retainer by the distal end thereof and the retainer pressing against each other due to elastic deformation of at least one portion among the annular flame portion, the central support portion and rod-like support portion, further, the base portion of the rod being pressed against and fixed to a wall surface near the first blockage member by the distal end portion of the rod and the retainer fixed to each other.

6. The gas generator for a restraining device according to claim 5, wherein the central support portion has at least one orifice or recess, and the distal end portion of the rod is inserted into the orifice or recess of the central support portion, whereby the distal end portion of the rod and the retainer are fixed by being pressed against each other, and because the distal end portion of the rod and the retainer are fixed to each other, the base portion of the rod is pressed against and fixed to the wall surface in the vicinity of the first blockage member.

7. The gas generator for a restraining device according to claim 5, wherein a total open surface area of an opening portion surrounded by the central support portion, the annular frame portion, and the rod-like support portion is larger than a total open surface area of the gas discharge port formed in the diffuser and a cross-sectional area of the second channel.