Hydraulic pumping device i.e. piston pump, for conveying e.g. operating medium, has piston including driving pressure surface to which driving pressure is applied and working pressure surface restricting working pressure chambers of pump

摘要

The device has a piston (5) that is moved back and forth, where the piston includes a driving pressure surface to which driving pressure is applied to drive a pump. A working pressure surface of the piston restricts working pressure chambers (14, 15) of the pump. The working pressure chambers are connected with an operating, cooling and lubricating circuit. The piston is loaded on a side using elastic force of a retaining spring (10).