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GAS GENERATOR FOR RESTRAINING DEVICE OF VEHICLE

  • US 20110193330A1
  • Filed: 01/14/2010
  • Published: 08/11/2011
  • Est. Priority Date: 01/15/2009
  • Status: Active Grant
First Claim
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1. A gas generator for a restraining device of a vehicle comprising:

  • a housing forming an outer shell container of the gas generator, and having a circumferential wall portion which is provided with a gas discharge port, a first end, and a second end, opposite to the first end, the first end and the second end being both closed;

    a cup-shaped inner tube member disposed in the housing so that an opening end portion thereof is located in a side of a bottom plate of the second end, an inside of the cup-shaped inner tube member being an ignition chamber accommodating an ignition device, an outer space of the cup-shaped inner tube member being a combustion chamber charged with a gas generating agent, the inner tube member defining an inner circumferential surface of the combustion chamber;

    an outer circumference cylindrical member provided within the housing for defining an outer circumferential surface of the combustion chamber such that one end opening thereof abuts against a bottom plate of the second end of the housing,an annular porous member defining an upper surface of the combustion chamber and being provided between the outer circumference cylindrical member and the cup-shaped inner tube member such that a space is formed between the annular porous member and the bottom plate of the first end of the housing,a gas discharge path formed between the outer circumference cylindrical member and an inner wall surface of the circumferential wall portion of the housing;

    a communicating portion communicating the space and the gas discharge path, and being provided in the other end opening portion of the outer circumference cylindrical member; and

    a total cross-sectional area (A1) of the gas discharge port being smaller than a smallest cross-sectional area (A2) of a gas pathway extending from the combustion chamber to the gas discharge port and allowing combustion gas of the gas generating agent pass therethrough (A1<

    A2).

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