Abstract: Based on structure and motion forms of rzeppa constant velocity joint, the threedimensional model of circumferential clearance of elliptic section was established, and the formula of circumferential clearance angle (θ) at any swing angle and rotating angle was deduced, the changing law of θ with swing angle and rotating angle was obtained by using Matlab software. The results show that θ is related to the short and long half axle of the elliptical raceway, radius of steal ball, turning radius of steal ball, eccentricity, swing angle and rotating angle. The six fluctuations of θ lead to the vibration and noise during the travelling.
 

Key words: rzeppa constant velocity joint, circumferential clearance, swing angle, rotating angle