Kinematic and Static Analyses of Tripod and Rzeppa Constant Velocity Joints and Investigations of Three Dimensional Motion of Its Drive Shaft

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CVJ lines of front drive automobiles are composed of the tripod constant velocity joint (CVJ) or the double offset CVJ, the Rzeppa CVJ and the drive shaft. The rotational angle error of the CVJ line and the whirling motion of the drive shaft (the tripod shaft) and its fluctuation of axial direction are analyzed experimentally. From results of experiments with several values of the angle α between the housing shaft of the tripod CVJ and the drive shaft and the angle β between the outer-race shaft of the Rzeppa CVJ and the drive shaft., characteristics of the rotational angle error and the three dimensional motion (the whirling motion and the fluctuation of axial direction) are made clear. The rotational angle error is sinusoidal of 2π/6 period. The whirling motion has the period of 2π or 2π/6 according to the angle β.The closed loop equations of three cylindrical rollers, the spider of three spherical ends and the housing of the tripod constant velocity joints are deduced as the spatial mechanism. A procedure is established for solving simultaneously the set of conditional equations with respect to forces and moments acting on three cylindrical rollers, the spider and the housing, for any values of friction coefficients between cylindrical rollers and its grooves and spherical ends. Then, static characteristics of the tripod constant velocity joints are made clear.