Gas generator for air bag

• US 20070057496A1
• Filed: 06/07/2006
• Published: 03/15/2007
• Est. Priority Date: 06/08/2005
• Status: Abandoned Application

• Current Assignee: Daicel Chemical Industries Limited
• Original Assignee: Daicel Chemical Industries Limited
• Inventors: Matsuda, Naoki, Yabuta, Mikio
• Application Number:
  US11/448,039
• Publication Number:
  US 20070057496A1
• Time in Patent Office: Days
• US Class Current: 280/737
• 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

Abstract

A gas generator for an air bag, comprises, in a housing having a gas discharge port, a first combustion chamber and a second combustion chamber in which a gas generating agent and an ignition device are provided respectively. The second combustion chamber is separated from the first combustion chamber by a combustion chamber cup member disposed within the housing, and a second gas generating agent and a second ignition device are disposed within the combustion chamber cup member. The peripheral surface of the combustion chamber cup member has a fragile section adapted to be cleaved at the fragile section by activation of the second ignition device, thereby forming a discharge channel for the gas generated in the second combustion chamber.

Claims

1. A gas generator for an air bag, comprising:

a housing having a gas discharge port;

a first combustion chamber and a second combustion chamber, included in the housing;

a gas generating agent and an ignition device provided in each of the first combustion chamber and the second combustion chamber;

a combustion chamber cup member provided in the housing for separating the second combustion chamber from the first combustion chamber; and

a gas generating agent and an ignition device disposed within the combustion chamber cup member,

wherein, a peripheral surface of the combustion chamber cup member has a fragile section, and

the peripheral surface is adapted to be cleaved at the fragile section by an activation of the ignition device, thereby forming a discharge channel for the gas generated in the second combustion chamber.

5. The gas generator for an air bag according to any one of claims 1 to 4, wherein the fragile section provided on the peripheral surface of the combustion chamber cup member or enhancer chamber cup member is in the form of a groove and the fragile section is provided continuously or intermittently in the height direction of the peripheral surface.

6. The gas generator for an air bag according to any one of claims 1 to 4, wherein the fragile section provided in the peripheral surface of the combustion chamber cup member or enhancer chamber cup member is in the form of a groove and the fragile section is provided continuously or intermittently in the circumferential direction of the peripheral surface.

7. The gas generator for an air bag according to any one of claims 1 to 4, wherein the fragile section provided in the peripheral surface of the combustion chamber cup member or the enhancer chamber cup member is in the form of a groove, and the groove-shaped fragile section has a recess in at least one end section thereof.

8. The gas generator for an air bag according to any one of claims 1 to 4, wherein the fragile section provided in the peripheral surface of the combustion chamber cup member or the enhancer chamber cup member is in the form of a groove, and the groove has a V-like shape formed in a radial direction.

2. A gas generator for an air bag, comprising:

a housing having a gas discharge port;

a first combustion chamber and a second combustion chamber, included in the housing;

a gas generating agent and an ignition device, provided in each of the first combustion chamber and the second combustion chamber; and

,

an enhancer chamber cup member provided in the housing for separating, from the first combustion chamber, an enhancer chamber accommodating a first ignition device, an enhancer agent, and a space accommodating a gas generating agent,

wherein, a peripheral surface of the enhancer chamber cup member has a fragile section, the peripheral surface is adapted to be cleaved at the fragile section by an activation of the first ignition device, thereby releasing a combustion product into the first combustion chamber.

3. A gas generator for an air bag, comprising:

a housing having a gas discharge port;

a first combustion chamber and a second combustion chamber, included in the housing;

a gas generating agent and an ignition device, provided in each of the first combustion chamber and the second combustion chamber;

an enhancer chamber cup member provided in the housing for separating, form the first combustion chamber,

an enhancer chamber accommodating a first ignition device, an enhancer agent, and a space accommodating a gas generating agent, a peripheral surface of the enhancer chamber cup member having a fragile section, the peripheral surface being adapted to be cleaved at the fragile section by an activation of the first ignition device, thereby releasing a combustion product into the first combustion chamber; and

a combustion chamber cup member provided in the housing for separating, the second combustion chamber from the first combustion chamber, the second combustion chamber, the combustion cup member accommodating a second gas generating agent and a second ignition device, a peripheral surface of the combustion chamber cup member having a fragile section, and the peripheral surface being adapted to be cleaved at the fragile section by an activation of the second ignition device, thereby forming a discharge channel for the gas generated in the second combustion chamber.

4. A gas generator for an air bag, comprising:

a housing having a gas discharge port;

a combustion chamber provided in the housing;

a gas generating agent and an ignition device, provided in the combustion chamber;

an enhancer chamber cup member provided in the combustion chamber for separating, from the combustion chamber, an enhancer chamber accommodating an ignition device, an enhancer agent, a peripheral surface of the enhancer chamber cup member having a fragile section, the peripheral surface being adapted to be cleaved at the fragile section by an activation of the ignition device, thereby releasing a combustion product into the combustion chamber.