Hydrostatic continuously variable transmission with a set of pump distributor valves, a set of motor distributor valves and a set of clutch valves arranged radiately with and circumferentially alternating with the motor distributor valves

摘要

In a hydrostatic continuously variable transmission comprising an annular inner oil passage and an annular outer oil passage which are formed in the cylinder block between a large number of cylinder bores in the pump cylinder and a large number of cylinder bores in the motor cylinder so as to surround an axis of the cylinder block, large numbers of first and second distributor valves disposed radiately in the cylinder block and adapted to be reciprocally moved radially of the cylinder block, and a first and a second eccentric ring engaged with the first and second distributor valves, respectively, a large number of clutch valves are arranged radiately and circumferentially alternatively with the second distributor valves in the cylinder block and adapted to be reciprocally moved between radially inner and outer positions in the cylinder block to short-circuit the oil passages when the reciprocation stroke thereof exceeds a given value. The clutch valves are engaged with the second eccentric ring together with the second distributor valves, and the second eccentric ring are movable so that it can be moved between a clutch-on position in which it provides a normal reciprocal movement to the second distributor valves and a clutch-off position in which the clutch valves are reciprocally moved to a position to short-circuit the oil passage.