Let's try to get this discussion back to engineering. I am not an engineer
but offer this quote from "Machinery's Handbook", 11th ed. (1942), p568:
"Torque Capacity of Spline Fittings: The torque capacity of spline fittings,
per inch of bearing length at 1000 pounds pressure per square inch on the
sides of the spline, may be determined by the following formula, in which
T = torque capacity in inch-pounds per inch of length, N = number of
splines, R = mean radius or radial distance from center of ho;e to center of
spline, h = depth of spline:
T = 1000 N R h."
This is for conventional straight sided splines for which standards exist.
The discussion I have seen on this thread thus far about wheel hub splines
ignores the fact that the drive is meant to be via the cone on the axle hub
and the inner cone of the wheel hub, and via the outer cone of the wheel hub
and the inner cone of the wheel retaining nut (neither of which should be
greased).
Very little, if any, torque is meant to be applied to the hub splines. Any
that is,
is the result of insufficient tightening (and checking of tightness) of the
retaining nut.
In other words, on properly maintained knock-on hubs, the splines will not
wear.
Cheers,
Linden
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