Gas generator

• US 20070069511A1
• Filed: 09/28/2006
• Published: 03/29/2007
• Est. Priority Date: 09/29/2005
• Status: Abandoned Application

• Current Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Original Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Inventors: Nakayasu, Masayuki
• Application Number:
  US11/528,416
• Publication Number:
  US 20070069511A1
• Time in Patent Office: Days
• US Class Current: 280/737
• CPC Class Codes: B60R 21/268 using instantaneous release of stored pressurised gas B60R21/26005 takes precedence

Abstract

The present invention provides a gas generator including: a cylindrical housing having two opening portions; an ignition device chamber connected to one of the opening portions 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 closing between the cylindrical housing and the ignition device chamber; a second blockage member closing between the cylindrical housing and the diffuser portion; a pressurized gas charged inside the cylindrical housing, a rod, for rupturing the second blockage member to open a path to the diffuser portion in actuation, being provided inside the cylindrical housing, a base portion of the rod being disposed to face the first blockage member, a distal end portion of the rod being disposed to face the second blockage member, the rod including the distal end portion having a flat surface which faces the second blockage member and a central portion which is other than the distal end portion and the base portion, an outer diameter of the distal end portion being larger than that of the central portion.

Claims

1. A gas generator comprising:

a cylindrical housing having two opening portions;

an ignition device chamber connected to one of the opening portions 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 closing between the cylindrical housing and the ignition device chamber;

a second blockage member closing between the cylindrical housing and the diffuser portion;

a pressurized gas charged inside the cylindrical housing,

a rod, for rupturing the second blockage member to open a path to the diffuser portion in actuation, being provided inside the cylindrical housing, a base portion of the rod being disposed to face the first blockage member, a distal end portion of the rod being disposed to face the second blockage member,

the rod including the distal end portion having a flat surface which faces the second blockage member and a central portion which is other than the distal end portion and the base portion, an outer diameter of the distal end portion being larger than that of the central portion.

2. The gas generator according to claim 1, wherein the second blockage member blocks a gas channel formed between the cylindrical housing and the diffuser portion, and an outer diameter (B₁) of the distal end surface of the rod and a diameter (A) of the gas channel satisfy the following relationship:

½

A≦

B₁<

A.

3. The gas generator according to claim 2, wherein an outer diameter (B₂) of the central portion of the rod and the diameter (A) of the gas channel satisfy the following relationship:

B₂≦

½

A.

4. The gas generator according to claim 1, wherein the diffuser portion has a cup-like shape having a plurality of gas discharge ports in a circumferential wall portion thereof, and after the second blockage member has been broken by the rod, the surface of the distal end portion comes into contact with a bottom surface of the diffuser portion not to block the gas discharge ports.

5. The gas generator according to claim 1, wherein the central portion of the rod has a groove serving as a gas channel.

6. The gas generator according to claim 1, wherein the surface area of the surface of the base portion of the rod that faces the first blockage member is larger than the cross-sectional area of the central portion of the rod.