First, the parts constituting the sealed volume of the cylindrical piston and cylinder bore, easy processing Liyuan Hydraulic motors, available with high precision, good sealing performance, high-pressure work is still high volumetric efficiency; second, Simply change the working stroke of the plunger can change the flow, easy to implement variable; third, piston main parts are compression stresses maintenance of hydraulic motors, material strength properties can be fully utilized. Due to the high pressure piston pump, compact structure, high efficiency, easy flow regulation, so the need for high pressure, high flow, high-power systems need to adjust the flow of hydraulic motors and occasions, such as gantry planer, broaching machine, hydraulic machines, construction machinery , mining and metallurgy machinery, widely used on the ship. Piston arrangement and the direction of movement of the plunger can be divided into radial and axial piston pump piston into two categories, according to the assignment device type can be divided with a gap-type seal with flow deputy piston and valve piston pump with flow control devices into two categories, according to whether the variable displacement piston pumps are divided into quantitative and variable piston pump. Machinery loss of mechanical loss refers to the loss of hydraulic torque. It is equal to the hydraulic pump of large theoretical torque Tt and the actual ratio of the input torque T, the torque loss is provided Tl hydraulic motor is installed, the mechanical efficiency of the hydraulic pump (2) The power of the hydraulic pump 1) Input power refers to power input acting on the pump shaft mechanical power, when the input torque Ti, when the angular velocity is ω = Tiω2) output power P refers to hydraulic output power during operation of the actual suction pressure differential Δp between ports and output q product flow, namely P = Δpq (3) the overall efficiency of the overall efficiency of the hydraulic pump hydraulic pump is the actual output to its input power of the power source of hydraulic motors, hydraulic Jing Chong (online consultation), the hydraulic motor from Jinan Jing Chong Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) Shandong Jinan, mining machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. In the crystal creating hydraulic leadership with the staff warmly welcome all inquiries negotiations to create the crystal creating hydraulic better future.