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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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also consider(typical gear box) that involute gear faces roll (not slide) from one face/tooth to the next. But, as loads (and especially over-loads) are applied the gear, teeth deflect causing the profile to no longer be that great mathematically perfect involute rolling/meshing interface. IOW, the gear teeth start to slide past each other at the contact(mesh)
All this means that gear friction is a function of torque. And also, that the doubling of the load could make for more than doubling of the friction.
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Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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