Hydraulic transmission components of small volume, light weight and compact structure easy, stepless speed regulation and easy to realize standardization, systematization and generalization. It is widely used in metallurgical machinery, engineering machinery, mining machinery, agricultural machinery, automobiles, ships, aircraft and other hydraulic systems. Although varied, but from the perspective of energy conversion, their working principle and the composition is basically the same.
Hydraulic transmission is also called volume hydraulic transmission, is liquid as the medium, the transmission device to transmit energy and control the use of liquid pressure energy and kinetic energy. Usually the liquid medium using the hydraulic system with the remaining liquid pressure energy is called hydraulic oil.
A typical hydraulic system comprises a hydraulic pump, hydraulic oil tank, directional control valve, flow control valve, the working cylinder, plunger valve and pressure relief valve. Three kinds of typical hydraulic pump hydraulic system used in gear pump, vane pump and axial reciprocating pump. Pump is the power component liquid system is the heart of the hydraulic pump control element. (including the flow valve, relief valve, directional valve and proportional valve etc.) for controlling and regulating the fluid pressure. The flow and direction, to meet the performance requirements of equipments, and the realization of various work cycle, the implementation of components to the pressure of the liquid can be converted to mechanical energy, so as to drive the movement of the mechanism.
