In order to compensate axial displacement, an axial sliding mechanism is often used in the intermediate shaft of a double universal joint.
为了补偿轴向位移，经常在双十字万向联轴器的中间轴上采用轴向滑动装置。
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This paper presented the working principle and structure of the double-action vane pump, analyzed its mechanism of variable displacement and characteristics of energy saving.