Heated gas inflator
First Claim
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1. An inflator for inflating an inflatable vehicle occupant protection device, said inflator comprising:
- structure defining a chamber;
inflation fluid stored in said chamber, said inflation fluid comprising in mixture a fuel gas, an oxidizer gas, and an inert gas mixture; and
actuatable means for initiating a combustion reaction between said fuel gas and said oxidizer gas;
said inert gas mixture comprising at least two different inert gases and having a composition selected to produce desired performance characteristics of the inflator;
wherein said fuel gas makes up a fixed molar percentage of said inflation fluid, said oxidizer gas makes up a fixed molar percentage of said inflation fluid, and said inert gas mixture makes up a fixed molar percentage of said inflation fluid, the composition of said inert gas mixture being adjustable to produce said desired performance characteristics of the inflator without changing said fixed molar percentages of said fuel gas, said oxidizer gas, and said inert gas mixture.
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Abstract
An inflator (40) for inflating an inflatable vehicle occupant protection device (14) includes structure that defines a chamber (220) and inflation fluid stored in the chamber. The inflation fluid includes in mixture a fuel gas, an oxidizer gas, and an inert gas mixture. The inflator (40) also includes an actuator for initiating a combustion reaction between the fuel gas and the oxidizer gas. The inert gas mixture includes at least two different inert gases and has a composition selected to produce desired performance characteristics of the inflator (40).
77 Citations
30 Claims
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1. An inflator for inflating an inflatable vehicle occupant protection device, said inflator comprising:
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structure defining a chamber; inflation fluid stored in said chamber, said inflation fluid comprising in mixture a fuel gas, an oxidizer gas, and an inert gas mixture; and actuatable means for initiating a combustion reaction between said fuel gas and said oxidizer gas; said inert gas mixture comprising at least two different inert gases and having a composition selected to produce desired performance characteristics of the inflator; wherein said fuel gas makes up a fixed molar percentage of said inflation fluid, said oxidizer gas makes up a fixed molar percentage of said inflation fluid, and said inert gas mixture makes up a fixed molar percentage of said inflation fluid, the composition of said inert gas mixture being adjustable to produce said desired performance characteristics of the inflator without changing said fixed molar percentages of said fuel gas, said oxidizer gas, and said inert gas mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for producing an inflator for inflating an inflatable vehicle occupant protection device, said method comprising the steps of:
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providing a structure defining a chamber for receiving pressurized inflation fluid; providing inflation fluid for storage in said chamber, said inflation fluid comprising in mixture a fuel gas, an oxidizer gas, and an inert gas mixture comprising at least two different inert gases; and selecting the composition of said inert gas mixture to produce desired performance characteristics of the inflator; wherein said fuel gas makes up a fixed molar percentage of said inflation fluid, said oxidizer gas makes up a fixed molar percentage of said inflation fluid, and said inert gas mixture makes up a fixed molar percentage of said inflation fluid, the composition of said inert gas mixture being adjustable to produce said desired performance characteristics of the inflator without changing said fixed molar percentages of said fuel gas, said oxidizer gas, and said inert gas mixture. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. An inflator for inflating an inflatable vehicle occupant protection device, said inflator comprising:
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structure defining a chamber; inflation fluid stored in said chamber, said inflation fluid comprising in mixture a fuel gas, an oxidizer gas, and an inert gas mixture; and actuatable means for initiating a combustion reaction between said fuel gas and said oxidizer gas; said inert gas mixture comprising at least two different inert gases and having a composition selected to produce desired performance characteristics of the inflator; wherein said fuel gas makes up a fixed molar percentage of said inflation fluid, said oxidizer gas makes up a fixed molar percentage of said inflation fluid, and said inert gas mixture makes up a fixed molar percentage of said inflation fluid, the composition of said inert gas mixture being adjustable to produce said desired performance characteristics of the inflator without changing said fixed molar percentages of said fuel gas, said oxidizer gas, and said inert gas mixture; wherein said fixed molar percentage of said fuel gas and said fixed molar percentage of said oxidizer gas are selected to produce a desired burst disk rupture time within 3 milliseconds after actuation of said inflator over a predetermined temperature band.
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Specification