Filterless airbag module
First Claim
1. A filterless airbag module comprising:
- an inflator including a housing;
a gas generating propellant contained within the housing;
at least one aperture formed in the housing to enable fluid communication between an interior of the housing and an exterior of the housing;
a combustion gas retainer positioned exterior of the housing and in alignment with the at least one aperture, the retainer and a surface of the housing defining a cooling chamber for cooling combustion gases received from the housing via the at least one aperture; and
an airbag arranged to fluidly communicate with the at least one aperture.
1 Assignment
0 Petitions
Accused Products
Abstract
A filterless airbag module (10) including a structure for cooling combustion gases. The airbag module (10) includes an inflator (12) having a housing (18) and a smokeless gas generating propellant (20) contained within the housing. One or more apertures (24) are formed in the housing (18) to enable fluid communication between an interior of the housing and an exterior of the housing. An airbag (16) is arranged to fluidly communicate with the apertures (24). A combustion gas retainer (42) is positioned exterior of the housing (18) and in alignment with the apertures (24). The retainer (42) and a surface (72) of the housing (18) combine to define a cooling chamber (50) for cooling combustion gases received from the housing (18) via the apertures (24). The cooling chamber (50) is dimensioned to affect an average residence time of combustion gases received in the chamber (50) so that the gases reside in the cooling chamber (50) for a length of time sufficient to cool the gases to a temperature within a predetermined temperature range prior to the gases exiting the cooling chamber (50). A heat-absorbing material may be positioned in the cooling chamber (50) to aid in cooling combustion gases received therein.
24 Citations
39 Claims
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1. A filterless airbag module comprising:
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an inflator including a housing;
a gas generating propellant contained within the housing;
at least one aperture formed in the housing to enable fluid communication between an interior of the housing and an exterior of the housing;
a combustion gas retainer positioned exterior of the housing and in alignment with the at least one aperture, the retainer and a surface of the housing defining a cooling chamber for cooling combustion gases received from the housing via the at least one aperture; and
an airbag arranged to fluidly communicate with the at least one aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for cooling combustion gases comprising the steps of:
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providing a housing defining a combustion chamber and having at least one aperture formed in the housing to enable fluid communication between the combustion chamber and an exterior of the housing;
providing a combustion gas retainer positioned exterior of the housing and in alignment with the at least one aperture, the retainer and a surface of the housing defining a cooling chamber for cooling combustion gases received from the combustion chamber via the at least one aperture, the cooling chamber being dimensioned to affect an average residence time of combustion gases received therein so that the gases reside in the cooling chamber for a length of time sufficient to cool the gases to a temperature within a predetermined temperature range prior to the gases exiting the cooling chamber;
conveying combustion gases from the combustion chamber to the cooling chamber via the at least one aperture; and
retaining the gases within the cooling chamber for the length of time sufficient to cool the gases to a temperature within the predetermined temperature range. - View Dependent Claims (27, 28, 29, 32, 33)
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30. The method of claim 30 wherein the flow path of the combustion gases extends between the combustion chamber and an inflatable device of a vehicle occupant protection system, and wherein the gases are cooled to a temperature within the predetermined temperature range prior to dispersal of the gases from the cooling chamber into the inflatable device.
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31. The method of claim 31 further comprising the step of positioning a heat-absorbing material along the flow path whereby combustion gases received in the cooling chamber flow along the flow path defined by the retainer and impinge upon the heat-absorbing material to aid in cooling of the gases prior to direction of the gases into the inflatable device.
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34. A filterless airbag inflator comprising:
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a housing including an upper section and a lower section;
a smokeless gas generating propellant contained within the housing;
at least one aperture formed in the housing upper section to enable fluid communication between an interior of the housing and an exterior of the housing; and
a combustion gas retainer positioned exterior of the housing and in alignment with the at least one aperture, the retainer having a base portion extending from the housing, a wall extending from the base portion, and a flange extending from the wall in a direction generally toward the housing, the base portion, the wall, the flange, and an exterior surface of the housing defining a cooling chamber for retaining combustion gases received from the housing for a length of time sufficiently to cool the gases to a temperature within the predetermined temperature range.
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35. A vehicle occupant restraint system comprising:
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a filterless airbag module including an inflator having an inflator a housing, a gas generating propellant contained within the housing, at least one aperture formed in the housing to enable fluid communication between an interior of the housing and an exterior of the housing, a combustion gas retainer positioned exterior of the housing and in alignment with the at least one aperture, the retainer and a surface of the housing defining a cooling chamber for cooling combustion gases received from the housing via the at least one aperture, and an airbag arranged to fluidly communicate with the at least one aperture; and
a safety belt assembly including a housing and a safety belt extending from the housing, the safety belt having a first panel, a second panel affixed to the first panel to form a pocket therebetween, and an amount of an energy-absorbing material secured in the pocket. - View Dependent Claims (36, 37, 38, 39)
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Specification