Swash plate type hydraulic drive transmission and hydrostatic type continuously variable transmission

摘要

Distributing valves of a swash plate type hydraulic drive transmission can make a cylinder block smaller and reduce the number of processes and the number of parts. Distributing valves alternately switch, corresponding to the axial reciprocating motion of plungers, communication and cutoff between communication passages communicated to oil chambers opening to the inner surface of cylinder holes and low pressure ports and high pressure ports communicated to a low pressure oil passage and a high pressure oil passage opening to the inner surface of the cylinder holes.