| 摘要 |
A piston is guided by a two-point guide thus allowing a working liquid to smoothly flow into or flow out from a liquid chamber. The liquid chamber is formed into a donut shape and an opening of a passage of the working liquid is arranged at a center portion of the donut. The piston adopts a stepped structure which has a large-diameter portion and a small-diameter portion. The large-diameter portion is fitted into a first cylinder bore and a small-diameter portion is fitted into a second cylinder bore. The working liquid flows into or flows out from the hydraulic chamber through groove passages formed on an outer periphery of the small-diameter portions.
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