Gas generator

• US 20070024038A1
• Filed: 07/25/2006
• Published: 02/01/2007
• Est. Priority Date: 07/26/2005
• Status: Abandoned Application

• Current Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Original Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Inventors: Numoto, Kenji, Ryobo, Eiichi, Yamazaki, Masayuki
• Application Number:
  US11/491,981
• Publication Number:
  US 20070024038A1
• Time in Patent Office: Days
• US Class Current: 280/736
• CPC Class Codes: B60R 2021/26041 of elongated shape
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder

Abstract

The invention is a gas generator, including: a tubular housing having a gas discharge port, a combustion chamber provided inside the tubular housing and charged with a solid gas generating agent and a flame transmission tube disposed in an axial direction of the tubular housing inside the combustion chamber and provided with a plurality of communication holes that communicate with the combustion chamber, the flame transmission tube having an ignition region provided with an ignition device and a flame transmission region for transmitting flame generated by the actuation of the ignition device, the ignition region and the flame transmission region meeting the following requirements (a) and (b): (a) a mean inner diameter of the ignition region>a mean inner diameter of the flame transmission region; (b) a total opening surface area of the communication holes in the ignition region<a total opening surface area of the communication holes in the flame transmission region.

Claims

1. A gas generator, comprising:

a tubular housing having a gas discharge port,

a combustion chamber provided inside the tubular housing and charged with a solid gas generating agent and

a flame transmission tube disposed in an axial direction of the tubular housing inside the combustion chamber and provided with a plurality of communication holes that communicate with the combustion chamber,

the flame transmission tube having an ignition region provided with an ignition device and a flame transmission region for transmitting flame generated by the actuation of the ignition device,

the ignition region and the flame transmission region meeting the following requirements (a) and (b);

(a) a mean inner diameter of the ignition region>

a mean inner diameter of the flame transmission region;

(b) a total opening surface area of the communication holes in the ignition region<

a total opening surface area of the communication holes in the flame transmission region.

2. The gas generator according to claim 1, wherein the inner diameter of the flame transmission tube decreases continuously from one end portion including the ignition region to another end portion including the flame transmission region.

3. The gas generator according to claim 1, wherein the communication holes of the flame transmission tube are arranged with an interval in the axial direction and with an equal interval in the circumferential direction

4. The gas generator according to claim 1, wherein opening portions at both ends of the tubular housing are closed with a disk-shaped first closure and a second closure and a portion for positioning the flame transmission tube is provided on the inner surface of at least one of the first closure and the second closure.