轴向柱塞式电液泵的油隙损耗与机械效率

介绍了轴向柱塞式电液泵的结构与工作过程，分析了轴向柱塞式电液泵的各种机械损耗，建立了其机械效率的计算模型，在此基础上给出了定子与转子间油隙损耗与机械效率随转速、压力、温度变化的曲线.计算结果表明，研究的这种轴向柱塞式电液泵在油温50 ℃、转速 4 000 r/min、压力28 MPa时的油隙损耗只占总机械功率的1.737%，大大低于传统电机-泵组中电机的风扇与机械损耗，此时电液泵机械效率为92.6%，高于传统电机-泵组.机械效率的提高使得轴向柱塞式电液泵的总效率高于传统电机-泵组.分析了油隙长度对其损耗的影响，结果表明该电液泵油隙长度仍有减小的空间.

Oil gap loss and mechanical efficiency of axial piston electro-hydraulic pump

From the innovation perspective, the structure and working process of axial piston EHP were described. With various mechanical losses analyzed, the mechanical efficiency calculation model of EHP was established and the oil gap loss as well as mechanical efficiency varying with speed, pressure and temperature was respectively presented. The simulation at the temperature of 50 ℃, the speed of 4 000 r/min and the pressure of 28 MPa shows a relatively high working efficiency. The oil gap loss of EHP is 1.737%, which is much lower than the van and mechanical losses of motors in traditional motor-pump set. And the mechanical efficiency is 92.6%, which is higher than traditional motor-pump set. The mechanical efficiency improvement makes the overall efficiency of the axial piston EHP higher than motor-pump set. The influences to the loss by the oil gap length were analyzed, and the result indicates that the oil gap length can be further reduced.