Importance

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Abstract

An outer joint member and a hub wheel are coupled to be able to transmit torque by meshing face splines respectively provided and applying a tightening force in an axial direction between both the face splines. Shapes of tooth surfaces of the face splines are determined such that, when bringing the face splines close to each other in the axial direction and meshing them with each other, tooth surfaces of the face splines first come into contact with each other in, among an outer diameter portion of a meshing region between both the face splines, an inner diameter portion, and an intermediate portion sandwiched between the outer diameter portion and the inner diameter portion, one of the outer and inner diameter portions, and then the tooth surfaces of both the face splines come into contact with each other in the other of the outer and inner diameter portions.

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First Claim