Hydrostatic vehicle drive for e.g. heavy duty utility vehicles has single pressure limitation valve only for working pressure, and pressure reduction valve

摘要

The device has a hydraulic pump (1), a hydraulic motor (3), and regulator unit (5) for an output torque of the drive. The unit has a controllable pressure limitation valve (6) with pre-control stage (8) to adjust the working pressure in the hydraulic circuit. It is controlled by a pressure reduction valve (7) for sensitive control of the output torque on the motor. The reduction valve has a electrical, hydraulic, or mechanical control.