Abstract To find out the average transmission efficiency of the tripod universal joint, the motion law of the slider on the input shaft of the tripod universal joint was analyzed. Firstly, an auxiliary coordinate system was established at the center of the slider, and the sliding velocity of the slider at the center of the contact surface between the slider and the guide groove relative to the guide groove and the sliding velocity of the slider center relative to the guide groove were calculated. Secondly, the instantaneous transmission efficiency of the tripod universal joint was deduced by the relationship between the friction power loss and velocity. Finally, the expression of the average transmission efficiency of the tripod universal joint was obtained by integration. Through analysis， it was found that the average transmission efficiency of the tripod universal joint was related to the friction coefficient, the deflection angle between the input shaft and the output shaft, the trigeminal arm radius and the rotation radius. The average transmission efficiency of the tripod universal joint decreased with the increase of the friction coefficient, the deflection angle and the trigeminal arm radius, and increased with the increase of the rotation radius. This result provides an important theoretical basis for the design and application of the tripod universal joint.
Received: 14 January 2019
Published: 28 August 2019
LI Song-mei, QIU Shi-kai. Average transmission efficiency analysis of tripod universal joint. Chinese Journal of Engineering Design, 2019, 26(4): 379-384.
