Gas generator

• US 20050189753A1
• Filed: 02/10/2005
• Published: 09/01/2005
• Est. Priority Date: 02/10/2004
• Status: Abandoned Application

• Current Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Original Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Inventors: Yabuta, Mikio, Kato, Kazuhiro, Oda, Shingo, Niwa, Hirotoshi, Kurihara, Yuji
• Application Number:
  US11/053,834
• Publication Number:
  US 20050189753A1
• Time in Patent Office: Days
• US Class Current: 280/741
• CPC Class Codes: B60R 21/261 with means other than bag structure to diffuse or guide inflation fluid
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder
• CPC Class Codes: B60R 22/1954 characterised by fluid actuators, e.g. pyrotechnic gas generators actuating a cable B60R22/1952
• CPC Class Codes: F42B 3/04 for producing gas under pressure generators of inflation fluid especially adapted for vehicle air bags B60R21/26

Abstract

The present invention provides a small gas generator which is capable of preventing a cup-like member or fragments thereof from being scattered, even when gas is discharged in the radial direction of the gas generator. The gas generator comprises a cup-like member having a cylindrical form with a bottom, which is integrated with an igniter assembly at a joining portion. The thickness of the joining portion is greater than the thickness of a side wall portion of the cup-like member.

Claims

1. A gas generator comprising an igniter assembly in which an igniter functioning as an activation starting means is held by an igniter collar member, a gas generating agent which generates a gas when ignited by an activation of the igniter, and a cup-like member in a cylindrical form with one closed end, in which the gas generating agent is accommodated,

wherein a joining portion to be joined to the igniter collar member in the igniter assembly is provided on an open side end portion of the cup-like member, the joining portion serving to integrate the cup-like member and igniter assembly, and

the thickness of the joining portion provided on the cup-like member is greater than the thickness of a side wall portion of the cup-like member.

2. The gas generator according to claim 1, wherein the joining portion is a flange portion formed by bending the open side end portion of the cup-like member.

3. The gas generator according to claim 2, wherein the flange portion of the cup-like member is fixed to the igniter collar member in the igniter assembly by crimping.

4. The gas generator according to claim 1, wherein a fragile portion, formed to be the weakest part of the wall portion of the cup-like member in relation to pressure or heat generated in the interior of the cup-like member, is provided in the side wall portion of the cup-like member.

5. The gas generator according to claim 4, wherein the fragile portion is a notch formed to extend in the axial direction of the cup-like member, and the notch is formed between the joining portion and a closed surface side end portion.

6. The gas generator according to claim 4 or 5, wherein the fragile portion is provided equally in a circumferential direction of the cup-like member.

7. The gas generator according to claim 1 or 2, wherein the thickness of the joining portion provided on the cup-like member is at least 1.3 times the thickness of the side wall portion of the cup-like member.