Patent ID: 6997832

Claim:
A variable-speed control system for a transmission comprising an input primary pulley and an output secondary pulley composed of variable pitch pulleys, and an endless belt movably wound around said input primary and said output secondary pulleys, said variable-speed control system comprising; an input side and an output side pressure application device having a pressing force supply path that gives one pulley of said input primary and said output secondary pulleys a reference function by applying a pressing force, and an elastic force supply path that gives the other pulley a follower function by applying an elastic force; an input elastic device and an output elastic device applying to said input primary and said output secondary pulleys the respective elastic force generated by being variably press-controlled in series via said input side and said output side pressure application devices, respectively; an input or an output compound compressing device including two compressing devices connected with a semi-elastic force supply path to said pressing force supply path, so as to regulate a frictional pressure applied to said one pulley continuously after instructions has been stopped, with the use of a semi-elastic force that results from the simultaneous supply of the pressing force and the elastic force; and a control device for making axial torque controls of both said input primary and said output secondary pulleys hold a low-speed range and/or a high-speed range into a higher transmitting efficiency, cooperating with the semi-elastic force applied to said one pulley and the elastic force applied to said the other pulley.