Abstract: To improve the operation efficiency and reliability of axial piston pump,a reliability design method for mechanical efficiency of axial piston pump was presented.Based on the analysis of the instantaneous theoretical torque and instantaneous friction torque loss of a single piston pair,the instantaneous mechanical efficiency model of the whole axial piston pump was established.A reliability analysis method for mechanical efficiency of piston pump was proposed by using the fourth order moment technique,and Monte Carlo method was used to verify the accuracy and timeliness of the proposed method.The influence of the design variables on the reliability of axial piston pump was analyzed by using the reliability sensitivity analysis method.The results showed that the cylinder rotation angle was varied periodically with the reliability of mechanical efficiency of axial piston pump.When the number of pistons was 9,the lowest reliability appears at 20°of cylinder rotation angle.When the number of pistons was 8,the lowest reliability of mechanical efficiency appears at 0°and 45°of cylinder rotation angle.The influence trend of each random variable on reliability was different at any instant.The mechanical efficiency reliability of the piston pump could be improved by properly controlling the sensitive parameters.

Key words: axial piston pump, instantaneous mechanical efficiency, torque loss, reliability, sensitivity

摘要： 为了提高轴向柱塞泵的运行效率和工作可靠性,提出轴向柱塞泵机械效率的可靠性设计方法。通过分析单个柱塞副瞬时理论转矩和瞬时摩擦转矩损失,建立整个轴向柱塞泵瞬时机械效率模型;结合四阶矩技术,提出柱塞泵机械效率可靠性分析方法,并采用Monte Carlo法验证了所提方法的准确性和时效性;运用可靠性灵敏度分析方法分析了各设计变量变化对轴向柱塞泵可靠性的影响。研究结果表明,轴向柱塞泵机械效率可靠度随缸体转角周期性变化,柱塞数为9时缸体转角为20°的可靠度最低,柱塞数为8时缸体转角为0°和45°的机械效率可靠度最低,各随机变量在任一瞬时对可靠性的影响趋势各不相同,对敏感参数适当进行控制可以提高柱塞泵机械效率的可靠度。

关键词: 轴向柱塞泵, 瞬时机械效率, 转矩损失, 可靠性, 灵敏度