A drive shaft includes a plurality of external crowned spline teeth configured for transmitting torque in a drive system such that contact stress can remain substantially even as misalignments occur. The drive shaft can be manufactured by forming a groove in a drive shaft blank in a direction perpendicular to the side faces of the spline teeth being formed. The resulting spline teeth can have crowned side-wall surfaces that have equal crown drops along the height of the side walls of the spline teeth.

The invention relates to a method for the fine-processing of a toothing by a single-indexing method, wherein a disk-type fine-toothing machine (S) that rotates about its axis is brought into rolling processing engagement with a tooth flank of the toothing in order to remove material from the tooth flank, wherein a line contact is established while in processing engagement, and the contact line moves over the tooth flank in accordance with a movement having a directional component (Xc0) that is radial to the toothing axis (C), and wherein the processing engagement is maintained in the same pitch with a reduced tangential distance between the tooth flank and the disk plane of the fine-processing tool and with a sign reversal of the radial directional component of the contact line displacement.

A process for improving the excitation behavior of a ground bevel gear set by altering the surface structure of a gear set member from tooth slot to tooth slot (Teeth 1-3). The method comprises shifting the roll-positions in a way that not every facet or flat (F) is positioned the same way on each flank (2) and/or changing the distances of the roll angle along a tooth slot (delta RPj) whereby flats are spaced unequally (i.e. varying widths) along the tooth. One or more additional processes for altering the surface structure may be included.

To provide a gear machining device and a gear machining method which achieve machining of tooth flanks having different torsion angles with high degree of accuracy. In a gear machining device, a side surface of a tooth of a gear includes a first tooth flank and a second tooth flank having a different torsion angle from the first tooth flank, a cutting blade of a machining tool has a blade traces having a torsion angle determined based on a torsion angle of the second tooth flank and an intersection angle between a rotation axis of a workpiece and a rotation axis of the machining tool so as to allow the second tooth flank to be machined on the pre-machined first tooth flank.

A continuous semi-completing method for machining the tooth flanks of a face coupling workpiece using a gear cutting tool having multiple blades. Exemplary methods include a) setting of a first machine setting, wherein an inner cutting edge of an mth blade of the gear cutting tool machines a convex flank of a first tooth gap, and an inner cutting edge of a further blade machines a convex flank of a following tooth gap, until all convex flanks of all tooth gaps are finish machined, and b) setting of a second machine setting wherein an outer cutting edge of an nth blade of the gear cutting tool machines a concave flank of a tooth gap, and an outer cutting edge of a further blade machines a concave flank of a following tooth gap, until all concave flanks of all tooth gaps are finish machined.