| 摘要 |
The power input shaft of a differential pump (which has a pump output shaft, mechanical reacting means for driving the output shaft at a speed which is inverse to the quantity of fluid flowing through the pump outlet and inlet) is drivenly connected to the vehicle power plant; the pump output shaft is mechanically connected to drive one set, e.g., front, wheels; two or more positive-displacement hydraulic motors are connected to drive other, e.g., rear wheels individually; and duct and valve means are provided for interconnecting the motors either in series or in parallel with the pump inlet and outlet for varying the effective displacements of the motors. The valve means can have more than two positions: When two motors are used, three different effective displacements are achieved by connecting the motors (1) in parallel, (2) in series, (or in parallel with a change in gear ratio between each motor and its wheel); when four motors are used, two are connected to drive each wheel and the motors are connected (1) in parallel, (2) each pair of two in series with the two series-connected pairs in parallel, or (3) in series with the pump. The differential pump has a sleeve for interlocking the pump output shaft to the power input shaft, thereby stopping the pumping action. Additional positions of the valves (4) de-clutch the vehicle by interconnecting the pump outlet and inlet and (5) block flow from the pump outlet to cause equal speeds of the power input and pump output shafts.
|
