| 摘要 |
An inflator (10) for inflating an inflatable vehicle occupant protection device includes a housing (20) defining a generally ring-shaped propellant chamber (200) extending around an axis (50) of the inflator. The housing (20) has a fluid outlet (52) for directing flow of inflation fluid out of the housing to the inflatable device. A quantity of ignitable propellant (240) is located in the propellant chamber for, when ignited, producing inflation fluid for inflating the inflatable device. The housing (20) has a fluid passage (90) between the propellant chamber (200) and the fluid outlet (52). The fluid passage (90), which is normally closed, opens upon actuation of the inflator (10) to enable fluid flow from the propellant chamber (200) to the fluid outlet (52). The fluid passage (90), when open, has a variable flow area depending upon the pressure in the housing (20). A heat sink (270) is located in the propellant chamber (200) between the ignitable propellant (240) and the fluid passage (90) for cooling and filtering inflation fluid flowing from the propellant chamber through the fluid passage. The inflator (10) includes a retainer (280) in the propellant chamber (200) between the ignitable propellant (240) and the fluid passage (90) for retaining the heat sink (270) in the propellant chamber upon actuation of the inflator.
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