| 摘要 |
A hydrostatic transmission comprises a hydraulically controlled speed differential means drivingly connected with an output shaft for transmitting the rotation torque of an input shaft to the output shaft and including a hydraulic element functionable as a reaction element therefor, a hydraulic positive displacement pump-motor of the variable type drivingly connected with the input shaft for controlling the hydraulic element in accordance with the pump angle thereof, a line circuit to provide hydraulic communication between the hydraulic element and the pump-motor, and a hydraulically operated drive power train selector device to selectively complete the forward and reverse drive power trains between the input shaft and the output shaft. The hydrostatic transmission further comprises an automatic control mechanism to preliminarily set the initial pump angle of the pump-motor in response to the shifting operation of the drive power train selector device and sequentially vary the pump angle in accordance with the driving condition of the input shaft. |
