Mathematical relationships obtained on the basis of the friction theory in a wedge pair are widely used in technical calculations. With the help of them the limit circumferential force in cone clutches and friction drives with wedge-type bodies (wedge roller transmissions, variable-speed friction block belt drives, V-belt transmissions and etc.) are determined. This may seem to be a simple problem which could be solved without difficulties, however the classical equations used can not be derived in stringent terms and was not confirmed experimentally. The aim of this paper is to clarify this problem.

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