修正心形线式内曲线径向柱塞马达脉动分析

The analysis on the flow pulsation of radial piston motor with the modified heart-shaped curve as inner curve

为设计出输出特性良好的内曲线径向柱塞式液压马达,提出了一种新型的内曲线——修正心形线.该曲线为一条简单、连续、封闭且高次可微的周期性曲线,可解决内曲线马达的内部冲击问题.选用修正心形线作为马达的内曲线,通过理论推导,分析不同周期数和柱塞数对马达相位的影响.相位分析结果表明:马达的脉动情况取决于马达的等效柱塞数.推导了该曲线形式下马达的脉动率通用公式,结果表明,随着等效柱塞数的增加,马达脉动率减小.仿真结果验证了理论分析结果的正确性.

To design a better output performance radial piston motor with inner curve,a new-type inner curve which is named modified heart-shaped curve is presented.The curve is simple,continuous,closed and higher-order differentiable.Using this curve as an inner curve of radial piston motor,the internal impact problem is solved.The influence of the piston＇s number and periodicity to the phase position are analyzed.The result shows that the motor＇s pulsation rate depends on the equivalent number of piston.A general formula for the pulsation rate of the motor with the modified heart-shaped curve as an inner curve is derived,and the formula shows that the motor＇s pulsation rate decreases with the increase of the equivalent piston number.At last,the conclusions are certified by simulation.