外啮合齿轮泵卸荷面积的精确仿真分析

为获得与困油压力仿真模型实现无缝连接的卸荷面积计算方法，依据齿轮泵的困油原理和卸荷线的分割面积法，计算出分割点随转角的变化规律，结合展开法生成的过渡曲线代替圆弧过渡，给出了卸荷面积与卸荷槽宽度之间的精确关系和一个困油周期内卸荷面积及困油面积的精确结果。实例仿真说明卸荷面积及困油面积的变化为抛物线型，结果数据与现有文献提供的非常一致，说明了所建模型的正确性。得出卸荷面积以及困油面积计算的精确性，为后续困油压力仿真的可靠性提供了保证以及计算方法的通用性。

Precise simulation analysis of relief area of external spur-gear pump

In favor of seamless connected with main program of pressure simulation model of trapped oil, analytical calculation method of relief area was necessary. In a trapped periods, based on the trapped oil principle and the sweeping-area method, firstly derived the precise relation of relief slot and gear transmission; secondly achieved the precise results of dynamic relief area and dynamic trapped area followed turn angle, and for this precise, an actual transition curve machined by generating method was substituted for traditional circle curve in tooth profile. Based on an instance, final simulation results was consistent with present literatures, which validated the calculation model of relief area was all right, and indicated their variation curve in a trapped period was the same as a high-order parabola. Educed the precise calculation of relief area and trapped area was a powerful pledge for the reliability of pressure simulation model, and the precise calculation method on relief area was universal for any style relief slot.