| 摘要 |
<p>A master cylinder has a stepped bore in which a piston (13) separates a high pressure chamber (12) from a low pressure chamber (26). A primary seal (17) is slidable in a smaller diameter bore portion (14) and an atmospheric seal (18) is slidable in a larger diameter bore portion (15). Any air seeping past the atmospheric seal (18) is kept from the region of the primary seal (17) by an auxiliary seal (29) and escapes into a reservoir (27) through an inlet port (28). Passageways (31,32,33) in the piston allow air free fluid into the region behind the primary seal.</p> |
