| 摘要 |
To prevent effects of small amplitude oscillations caused by pressure fluctuation, eccentric attachment of a cancel plate and biased load application of a return spring, and to achieve a long service life of the inner peripheral seal portion, a BPS ( 1 ) with a piston member ( 20 ) moving in an axial direction inside a cylinder ( 10 ) and defining a compression chamber (M) together with the cylinder ( 10 ) and a cancel plate ( 30 ) opposing to a bottom portion ( 11 ) of the cylinder ( 10 ) beyond the piston member ( 20 ) is provided with an inner peripheral seal portion ( 50 ) with a seal lip ( 52 ) slidably contacting an inner peripheral tube portion ( 13 ) of the cylinder ( 10 ) and a fitting portion ( 53 ) fitted to the inner peripheral tube portion ( 13 ) in an inner peripheral end portion ( 35 ) of the cancel plate ( 30 ).
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