PULLEY THRUST CONTROL DEVICE OF STEPLESS SPEED CHANGE DEVICE

摘要

PROBLEM TO BE SOLVED: To attain both prevention of slip of an endless belt and improvement of a power transmission efficiency by performing a positive control of a pulley thrust of a belt-type stepless speed change device.SOLUTION: A belt-type stepless speed change gear T transmits a torque of an engine E through an endless belt 15 wound around between a drive pulley 13 and a driven pulley 14. Since pulley thrust changing means 24 changes at least one of a pulley thrust of the drive pulley 13 and a pulley thrust of the driven pulley 14 in response to a variation of an input torque inputted from the engine E, it becomes possible to add a requisite minimum margin capable of restricting slip of the endless belt 15 in response to a variation of the input torque even if an input torque of the belt-type stepless speed change gear T varies due to changing of an output torque of the engine E in response to a crank angle of the engine E, and so it is possible to attain both prevention of slip of the endless belt 15 and improvement of power transmission efficiency.