Design and Experimental Study of High Water-based Cam Lobe Hydraulic Motor with Low Speed, High Torque and Flow Distribution Valve

doi:10.3901/JME.2025.04.365

Abstract

Abstract: Aiming at the problem of low volumetric efficiency, serious wear and leakage, and low service life in low-speed, high torque water hydraulic motor, a new type of cam lobe high water-based hydraulic motor with flow distribution valve is proposed, which the flow distribution valve and piston rotate synchronously. To analyze reasonable kinematics characteristics of motor piston, the profile parameters of inner curve cam and flow distribution cam are studied and designed. The water lubrication characteristics of the piston-roller pair are analyzed, and the lubrication state of piston-roller pair is boundary lubrication. A piston-roller pair with Peek (poly ether-ether-ketone) coatings is designed to reduce the contact stress, and its performance is verified by experiments. A flow distribution valve that meets the requirements of high water-based media is studied and designed. The working characteristics of the flow distribution valve under different pressures and opening frequencies are tested, and key technical parameters are determined for the reliable flow distribution design in high water-based motor. Meanwhile, a simulation model of the valve flow distribution high water-based motor is established in AMESim software, and the instantaneous output characteristics of motor are analyzed. Finally, the prototype of high water-based hydraulic motor with flow distribution valve is developed and the test system of prototype is built. The experimental results indicate that the flow distribution valve can work stably under pressure of 21 MPa and rotating speed of 15 r/min. The maximum working pressure, output torque and rotating speed range of prototype are 21 MPa, 3 264 N·m and 1-10 r/min respectively. The maximum volumetric efficiency reaches 99.6%.

Key words: water hydraulic, low speed and high torque, hydraulic motor, flow distribution valve, friction pair

CLC Number:

TH137

ZHAO Jiyun, MAN Jiaxiang, YU Mingquan, HAN Jing, WANG Yunfei, CAO Chao. Design and Experimental Study of High Water-based Cam Lobe Hydraulic Motor with Low Speed, High Torque and Flow Distribution Valve[J]. Journal of Mechanical Engineering, 2025, 61(4): 365-379.

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