| 摘要 |
PURPOSE:To obtain plural control patterns for the pressure of working fluid, by dividing the back pressure chamber of an accumulator mechanism into plural subback pressure chambers respectively with a different pressure receiving area and selectively supplying a back pressure to each subback pressure chamber. CONSTITUTION:An accumulator mechanism 100, dividing its back pressure chamber 104 into plural subback pressure chambers 104a, 104b respectively with a different pressure receiving area and connecting each subback pressure chamber 104a, 104b with a back pressure supply source through a selector valve 110, selectively supplies a back pressure to each subback pressure chamber 104a, 104b. In this way, the accumulator mechanism, changing in accordance with the pressure receiving area the pressing force of a piston 101 in the direction of a pressure regulating chamber 103, can plurally obtain a control pattern for the pressure of working fluid introduce into the pressure regulating chamber 103.
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