US 6,648,370 B2Granted

Gas generating apparatus

AssigneeTakata Corporation

InventorsKoji Koga, Tsuneo Chikaraishi

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Abstract

A gas generating apparatus is provided which includes a plurality of combustion chambers and a filter chamber. The filter chamber contains a filter which includes a region which is not substantially heated by combustion gases generated by one combustion chamber and which receives combustion gases subsequently generated in another combustion chamber. In this fashion, a high gas cooling efficiency is achieved. The gas generating apparatus has an upwardly-opening vessel-shaped base and a downwardly-opening vessel-shaped cup which when combined form an outer shell of combustion chambers. A filter cap is fixed to the upper side of the cup, thereby defining the filter chamber. A first combustion chamber is positioned outside a pipe through the base and a second combustion chamber is formed inside the pipe. A foil on the inner surface of the filter chamber prevents combustion gases emitted by one combustion chamber entering another combustion chamber.

Claims20

Dependent claims

A gas generating apparatus, comprising:

a vessel having a top wall and a side wall and containing a first combustion chamber having a first opening;
and a second combustion chamber having a second opening;
wherein each of the combustion chambers contains an ignitor and a propellant;
wherein at least one of the combustion chambers contains a cap containing a booster propellant and an auto ignition propellant;
a filter chamber accommodating a filter, wherein said filter chamber overlies the top wall of the vessel and is separated from each of said combustion chambers;
wherein the vessel includes a metal lining covering an interior surface of the side wall of the vessel and wherein an interior surface of the top wall of the vessel is not covered by the metal lining, wherein the metal lining is supported by a retainer plate;
wherein the apparatus is configured so that a combustion gas produced in the first combustion chamber exits the first combustion chamber through the first opening and enters a first portion of the filter chamber without passing through the second chamber;
and
a reverse-flow prevention member provided over the second opening thereby preventing the combustion gas generated in the first combustion chamber from flowing into the second combustion chamber.

6 more elements

A gas generating apparatus, comprising:

an inverted cup shaped vessel having a top wall and a side wall, the vessel containing a first combustion chamber including a first opening;
and a second combustion chamber including a second opening;
wherein at least one of the combustion chambers contains a cap containing a booster propellant and an auto ignition propellant;
a filter chamber accommodating a filter, wherein said filter chamber is separated from each of said combustion chambers and overlies the top wall of the vessel;
wherein an interior surface of the side wall of the vessel is covered by a metal lining having an opening adjacent the top wall of the vessel, wherein the metal lining is supported by a retainer plate;
wherein the apparatus is configured so that a first combustion gas produced in the first combustion chamber exits the first combustion chamber through the first opening and enters a first portion of the filter chamber without passing through the second chamber and a second combustion gas produced in the second combustion chamber exits the second combustion chamber through the second opening and enters a second portion of the filter chamber without passing through the first combustion chamber;
and
wherein the first and second openings are spaced apart so that the combustion gases exiting from the first and second combustion chambers do not pass through the filter in a locally concentrated manner.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/860,762Filed 21 May 2001 · us provisional application
Priority: 19 May 2000
Published: US 2002/0001785 A13 Jan 2002
Granted: 18 Nov 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B60R 21/2644
Using instantaneous generation of gas, e.g. pyrotechnic: using only solid reacting substances, e.g. pellets, powder
B60R 2021/2633
Using a variable source, e.g. plural stage or controlled output: with a plurality of inflation levels
B60R 2021/2648
Using only solid reacting substances, e.g. pellets, powder: comprising a plurality of combustion chambers or sub-chambers
F23C 2900/99006
Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor:…