| 摘要 |
PURPOSE:To stabilize working pressure in a hydraulic operating chamber as well as to make highly accurate hyraulic control performable, by interconnecting each separate oil passage to the hydraulic operating chamber and a sub-chamber, respectively. CONSTITUTION:Each of sub-chambers 20 and 21, killing the hydraulic pressure produced in a hydraulic operating chamber 19 by means of centrifugal force, is installed in the inner diameter side of the hydraulic operating chamber 19 and the backside of a fixed piston 23. Each oil passage 30 of these sub-chambers 20 and 21 formed in a shaft 2 is interconnected to the sub-chamber 21 at the backside from the inner diametral sub-chamber 20 via an interconnecting hole 31, while each oil passage for working fluid use formed in the shaft 2 is interconnected to the hydraulic operating chamber 19 via a feed hole 33 of the fixed piston 23. With this constitution, charging or discharge to or from these sub-chambers 20 and 21 is performable with one oil passage alone, and these separate operating oil passages 27, piercing through the fixed piston 23, and interconnected to the hydraulic operation chamber 19 so that a variation in working pressure is preventable from occurring. |
