| 摘要 |
In order to improve piston sealing performance and thereby prevent reactive gas from losing gas pressure wherever possible, a piston (11) has an expanding section (11a) formed at one end thereof contacting a force transmission component (10). When gas pressure resulting from reactive gas generated by a gas generator (13) causes the piston (11) to exert a pressing force on the force transmission component (10) in the event of an emergency, the expanding section (11a) expands toward the inner circumferential surface (9a) of a pipe (9) due to the gas pressure. As a result, the outer circumferential surface 11a 1 of the expanding section (11a) in the piston (11) comes into contact with the inner circumferential surface (9a) of the pipe (9) in a more efficient manner, resulting in enhanced sealing between the piston (11) and the inner circumferential surface (9a) of the pipe. This prevents reactive gas from losing gas pressure, thereby allowing the gas pressure to more efficiently act on the piston (11).
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