Pressurized medium for inflator
First Claim
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1. An inflator for inflating an air bag, comprising:
- an inflator housing having an opening portion at one end thereof;
a diffuser portion attached to the opening portion of the inflator housing and provided with at least one gas discharging port, a ratio (A1/A2) of a total area (A1) of the at least one gas discharging port and an area (A2) of the opening portion being equal to or greater than 0.015 and equal to or smaller than 1; and
a pressurized medium contained in the inflator housing, the pressurized medium consisting mainly of a mixture of helium and argon, and a coefficient of viscosity of the pressurized medium being 25 to 40 μ
Pas at 50 MPa and at 300°
K.
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Abstract
The present invention provides an inflator capable of prolonging the duration of inflation of an air bag. Since an inflator housing 12 of an inflator 10 for a curtain air bag is charged with a pressurized medium comprising a mixed gas of He and Ar (He:Ar=3:7 to 7:3), the sound velocity of the pressurized medium is smaller than that of a pressurized medium comprising He only, and the viscosity of the former is higher than that of the latter, so that the duration of the inflation of an air bag can be prolonged.
35 Citations
11 Claims
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1. An inflator for inflating an air bag, comprising:
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an inflator housing having an opening portion at one end thereof;
a diffuser portion attached to the opening portion of the inflator housing and provided with at least one gas discharging port, a ratio (A1/A2) of a total area (A1) of the at least one gas discharging port and an area (A2) of the opening portion being equal to or greater than 0.015 and equal to or smaller than 1; and
a pressurized medium contained in the inflator housing, the pressurized medium consisting mainly of a mixture of helium and argon, and a coefficient of viscosity of the pressurized medium being 25 to 40 μ
Pas at 50 MPa and at 300°
K. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification