| 摘要 |
PURPOSE:To improve working efficiency by forming intake and exhaust ports of circular shape and making the radius of an inner circle smaller than that of a circle inscribed on a connection port, and the radius of an outer circle larger than that of a circle circumscribed on the connection port. CONSTITUTION:Intake and exhaust ports 61 and 62 are formed to have a circular shape capable of being continuous to a plurality of connection ports 49 concurrently. The radius Ri of the inner circle of both ports 61 and 62 is made smaller than the radius R1 of a circle inscribed on the connection ports 49, and the radius Ro of an outer circle is made larger than the radius R2 of a circle circumscribed on the connection ports 49. According to the aforesaid constitution, it becomes possible to enlarge the area of a matching portion between the intake and exhaust ports 61 and 62 of the distribution ring and the connection ports 49 of a distribution tray and the fluid resistance of hydraulic oil can be substantially reduced, thereby enabling the improvement of the working efficiency of a hydraulic motor and the power transmission efficiency of a continuously variable transmission.
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