Output shaft motion analysis of the tripod universal joint
                                                           LI Song mei, LI Shuai shuai, WANG Yong, CHANG De gong
                  (College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China)

Abstract: Aiming at the output shaft movement problem of the tripod universal coupling, the coordinate system of the tripod unversal joint was establised and the motion equations of the input shaft and output shaft of the tripod universal joint were established by the coordinate transformation technique, and deduced that the trajectory equations and the distance equations of the output shaft when the double radial bearings were installed. The relationship between the output shaft were investigated by the numerical solution. Then the correctness of the theoretical analysis was vertified. The results indicate that the output shaft around the axis Zo do planetary motion, which the revolution is three times the input shaft speed in a movement cycle. With the greater the deflection angle, the more output shaft eccentricity, the greater the fluctuation of the trajectory snd the farther away from the input shaft.

Key words: tripod universal joint; twin radial bearings; motion analysis; numerical simulation