Research on Oil Stirring Loss Torque for Cam Guide Rail of Roller Piston Pump

doi:10.3901/JME.2025.14.306

Abstract

Abstract: The oil stirring loss of cam guide rail of the roller piston pump at high speed is one of the main sources of its mechanical efficiency loss. In order to quickly and accurately calculate the oil stirring torque, the model of the cam guide rail surface is established firstly based on the three-dimensional space envelope theory of the cam guide rail contour. Furthermore, an accurate analytical model of the stirring loss of the acceleration and deceleration cam guide rail components of the roller piston pump is established. The whole oil stirring loss is divided into two parts: peripheral surface friction resistance torque and end surface friction resistance torque, and the influence of key structural parameters on oil stirring resistance torque is discussed. Then the theoretical model is verified by CFD simulation preliminarily. Theoretical model shows that the stirring loss of the cam guide increases with the increase of the speed. And at speed of 12 000 r/min, the stirring resistance torque reaches 0.26 N·m, of which the circumferential surface friction resistance torque and end surface friction resistance torque account for 40.2% and 59.8% of the total torque, respectively. Finally, the oil stirring torque at 1 000-12 000 r/min is tested by experimental means, and the influence of oil temperature is considered. The experimental results are in good agreement with the theoretical and CFD numerical simulation results, which provide guidance for the research of stirring loss and the improvement of mechanical efficiency.

Key words: stirring loss, roller piston pump, cam guide rail, CFD simulation, theoretical model

CLC Number:

TH137

ZHANG Chenchen, CHEN Yi, LI Sheng, RUAN Jian. Research on Oil Stirring Loss Torque for Cam Guide Rail of Roller Piston Pump[J]. Journal of Mechanical Engineering, 2025, 61(14): 306-320.

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