Page 10 of Constant Velocity Joints for Industrial Machines by NTN Corporation Japan

outline sliding type outer race o-ring cage inner race boot band square-section circlip boot band c-ring ball round-section circlip boot shaft features expansion is possible within cvj the ball tracks on the outer race are parallel with the axis therefore relative axial expansion between the inner ring and outer ring is possible while transmitting power and providing an operating angle remarks 1 for the best operation of a sliding type joint the operating angleexpansion correlation operating method and installation/removal method should be considered for details contact ntn engineering 2 if much larger axial expansion is needed contact ntn engineering 3 some large size cvjs are capable of allowable maximum operating angle of 15° 4 if the user wants to use the sliding type joint assembly in a vertical position contact ntn engineering low sliding friction ensures smooth expansion expansion within the cvj is achieved by a rolling motion of the balls which contributes to very small sliding friction expansion-induced friction as a result the joint assembly can smoothly plunge even when torque is applied the sliding friction of this arrangement is greatly reduced as compared with generic slide spline shaft see fig 1 8 axial vibration can be absorbed coefficient of sliding friction because of the smaller sliding friction axial vibration can be easily absorbed as compared with the slide spline arrangement 7 6 5 4 3 2 1 coefficient of sliding friction cvj no 100 sliding friction {kgf torque {kgf÷m torque {kgf÷m sliding friction {kgf coefficient of sliding 100 cvj no no slide splines are needed for the intermediate shaft the intermediate shaft does not need slide splines since the axial expansion and installation mounting distance adjustment are achieved by the structure inside the cvjs easy installation both axial expansion and operating angle definition 20° for smaller size 8° to 10° for larger size can be achieved simultaneously therefore this type of joint can accommodate a larger length variation allowing easy installation 0° 5° 10 15° 20° operating angle of cvj freedom for wide variety of design the cvj assembly can be designed to best suit the user s requirements in terms of torque capacity expansion and installation system fig 1 sliding friction 8

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