基于能量损失的斜盘式柱塞泵最小留缸长度计算方法

基于柱塞副能量损失分析,建立总效率损失的数学模型。基于总效率损失最小原则,提出最小留缸长度的数值计算方法。为保证柱塞相对运动时不会因摩擦自锁而卡死,提出柱塞与缸体滑动副的强度校核方法,以验证计算所得最小留缸长度的合理性。或依据柱塞与缸体滑动副强度校核方法,计算最小留缸长度以及对应的柱塞几何长度,在总效率损失最小的原则下,计算柱塞与缸体滑动副的最佳间隙。实例分析验证了该计算方法的正确性,并为某型工程机械用柱塞泵计算最小留缸长度为35 mm或40 mm,对应最佳间隙δ为0.012 mm或0.012 7 mm,理论计算总效率损失为0.3%。

Calculation Method of Minimum Length Retained in Cylinder for Swash plate Plunger Pump Based on Energy Loss

Based on the energy loss analysis of the sliding pair between plunger and cylinder, a mathematical model of overall efficiency loss was established. Based on the principle of minimum overall efficiency loss, a calculation method of minimum length retained in cylinder was proposed. In order to ensure the plunger was not stuck during the relative movement because of friction self locking, a strength check method of the sliding pair was proposed to validate the rationality of the calculated minimum length. And according to the strength check method, the minimum length and corresponding plunger geometry length were calculated. Under the principle of minimum loss of total efficiency, the optimum clearance of sliding pair was calculated by the strength check method. A case analyzed and verified the correctness of the calculation method, the calculated minimum length is 35mm or 40mm for the plunger pump used on an engineering machinery, the corresponding optimal clearance is 0.012mm or 0.0127mm, and the theoretical calculated overall efficiency loss is 0.3%.