Metal V-belt type continuously variable transmission

摘要

In a metal V-belt type continuously variable transmission having a driving pulley and a driven pulley, the inclination angle alpha of a V-groove in the pulleys is set in a range represented by tan-1 mu a< alpha <tan-1 mu s, wherein mu s represents the static friction coefficient between the pulley and an endless belt, and mu a represents the dynamic friction coefficient between the pulley and the endless belt. In a conventional metal V-belt type continuously variable transmission, the inclination angle alpha is set in a range represented by alpha >tan-1 mu s. If the transmittable torque Tin is increased, the tensile force of the endless belt is increased to produce slipping between the endless belt and the pulley. However, according to the present invention, by decreasing the inclination angle alpha to reduce the tensile force of the endless belt, the transmittable torque Tin can be increased while preventing slipping of the endless belt.