CONSTANT VELOCITY UNIVERSAL JOINT

摘要

PROBLEM TO BE SOLVED: To enhance fatigue strength at a spline fitting part by relaxing stress concentration of tensile stress and shear stress of an inside joint member and shaft of a constant velocity universal joint at the spline fitting part.

SOLUTION: A male spline part Sm is formed at an outer circumference of the shaft of the constant velocity universal joint. An enlarged diameter part 21b of which outer diameter dimension is gradually enlarged toward a side opposite to a shaft end is provided in a part in the side opposite to the shaft end out of a valley part 21 of the male spline part Sm. Round parts 21b1 having an arcuate cross section are provided in both sides in the circumferential direction of the enlarged diameter part 21b and the curvature radius of the round part 21b1 is gradually increased toward the side opposite to the shaft end. In a contact area of a tooth surface of the male spline part and a tooth surface of a female spline part formed at an inner circumference of an inside joint member, 0°<δ≤30° is satisfied wherein δ is an angle formed by a tangent in the end part of the side opposite to the shaft and the axis.

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