Abstract: A halfshaft assembly in a vehicle is disclosed. The halfshaft assembly includes a hub and a mating universal joint, such as a constant-velocity joint. The hub has a plurality of hub-teeth arranged annularly about an axis. The constant-velocity joint has a plurality of joint-teeth arranged annularly about the axis and engaged with the hub-teeth. Between each joint-tooth is a joint-root. The top, outermost surface of each tooth facing away from adjacent roots extends at a first angle with respect to the central axis. The root extends at a second angle with respect to the central axis. The angles are different such that the height of the tooth varies along the same tooth along the length of the tooth. Each tooth has involute side surfaces. The joint-teeth form a conical or inverse-conical shape.

Abstract: The present invention in one or more embodiments provides a halfshaft assembly, which includes a hub including a hub surface and a hub bore abutting the hub surface, the hub bore being defined by first and second bore-surfaces and a third bore-surface positioned there-between along an axial direction, the first bore-surface being smaller in cross-sectional dimension than the second bore-surface, and the hub face including thereupon female face-splines; and a constant-velocity joint including a joint face and a stem extending from the joint face along the axial direction, the joint face including thereupon male face-splines to engage the female face-splines of the hub at an engagement position, the stem defining thereupon a recess extending radially and spaced apart from the male face-splines. As detailed herein elsewhere, the halfshaft assembly is believed to reduce the occurrence of seal-pinching and spline block.