| 摘要 |
1,041,872. Hydrostatic gear control. M. HERTER. March 11, 1963 [March 9, 1962], No. 9482/63. Heading F2D. An hydrostatic pump and motor variablespeed and reversing gear has an hydraulic control circuit in parallel with the main hydraulic circuit, the pressure in the control circuit for adjusting the pump and the motor being proportioned to the output torque from the motor, as determined by the pressure in the main circuit and being also independently adjustable by manual control. An electrically driven variable capacity pump 3 feeds a reversible motor 4 through a reversing valve 8 controlled by a manual reversing valve 11. A control circuit for the actuation of differential pump and motor adjusting units 21, 22 is fed from the pump output 5 through a variable restrictor 20, in parallel with a non-return valve 13, and is controlled by a pedal-operated reducing valve 34 and a second reducing valve 32. The capacity setting member 27 of the pump 3 is connected to a cam 36 which sets the reducing valve 32 in accordance with the pump output which is proportional to the transmitted torque. The cam 36 is so shaped to provide optimum acceleration of the vehicle without overloading the pump driving motor irrespective of the action of the driver's pedal 33. |
