大排量径向柱塞泵滑靴与定子的运动分析

Analysis of the Motion between Slipper and Stator of Large Displacement Radial Piston Pump

针对大排量径向柱塞泵定子特殊安装方式,首先假设滑靴与定子固接,分别从单柱塞、双柱塞等几个方面,画出运动机构简图,进行自由度分析,得到定子与转子角位移和角速度之间关系。然后分析滑靴沿定子内表面运动时,滑靴与定子之间的运动关系。结果发现,吸油区滑靴对定子内表面作用力相对较小,可以认为受到滑靴为一数值较小且阻碍定子运动的摩擦力作用。定子主要由排油区滑靴摩擦力驱动,不同位置滑靴对定子运动产生促进和阻碍的作用不同,使得定子将以一会儿增大或者一会儿减小的变化角速度旋转。和传统定子固定形式径向柱塞泵相比,此结构有效降低了滑靴与定子之间因为摩擦而消耗的功率,机械效率得到提升。

According to the special installation method of the stator of the large displacement radial piston pump,the slipper is supposed that it’s fixed to the stator,and the schematic diagram of the moving mechanism is drawn from the aspects of single piston and double piston respectively. And the degree of freedom is analyzed to get the relationship between the angular displacement and angular velocity of the stator and rotor. Then,the relationship between the slipper and the stator is analyzed when the slipper moves along the inner surface of the stator. It is found that the acting force of the slipper on the stator inner surface is relatively small in the oil absorption area,and it can be considered that the friction effect of the slipper is small and hinder the movement of the stator. The stator is mainly driven by the frictional force of the slippers in the oil discharge area. Different positions of the slippers have different effects on promoting and hindering the stator movement,so that the stator will rotate at a high or a low angular speed for a while. Compared with the traditional radial piston pump which stator is fixed,this structure effectively reduces the power consumption between the slipper and the stator because of friction,and improves the mechanical efficiency.