Journal of Shanghai Jiaotong University ›› 2020, Vol. 54 ›› Issue (2): 160-166.doi: 10.16183/j.cnki.jsjtu.2020.02.007

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Impact of Vane Friction Coefficient on Cam-Rotor Motor’s Torque Performance

TAN Dun,TAO Jianfeng,CHEN Liangshen,WANG Xuyong   

  1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Published:2020-03-06

Abstract: In order to study the influence of the blade friction coefficient on the torque performance of the hydraulic cam-rotor servo motor, a mechanical model of the vane motor torque is established. By analyzing the force on the vane, the relationship between the positive pressure exerted by the cam-rotor on the vane and the friction coefficient between the vane and the vane groove are derived. Based on this, the analytical formula between the friction coefficient and the resistance torque applied by the vane to the cam-rotor is derived. The MATLAB is used to simulate the mechanical model. The results show that the increase of the friction coefficient between the vane and the vane groove will reduce the positive pressure between the vanes, and increase the resistance torque of the vane to the cam-rotor, resulting in significant fluctuation of the motor output torque. The maximum and average values of the resistance torque are roughly linear to the friction coefficient. Reducing the geometrical tolerance and surface roughness between the vane and the vane groove can improve the low speed characteristics of the servo motor.

Key words: cam-rotor; vane motor; resistance torque; low speed performance; friction coefficient

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