Patent ID: 6050912
Filing Date: 2000-04-18
Classification: F16H

Abstract:
A continuously variable transmission for a vehicle, comprising:a drive pulley including first and second wheel counterparts which define therebetween a drive pulley groove, said first wheel counterpart being axially movable in response to an axial thrust to decrease the width of the drive pulley groove;a driven pulley including first and second wheel counterparts which define therebetween a driven pulley groove, said first wheel counterpart being axially movable in response to an axial thrust to decrease the width of the driven pulley groove;an annular belt disposed on said drive and driven pulleys to drivingly connect said drive and driven pulleys, said belt being fitted in the drive pulley groove and the driven pulley groove, said belt including a plurality of elements which are aligned along a periphery of said belt; anda control unit that variably controls the width of each of the drive pulley groove and the driven pulley groove in accordance with a transmission ratio based on an operating condition of the vehicle, and sets said axial thrust (Q) of each of the drive and driven pulleys so that a value of (Q.times.r)/T increases as the transmission ratio becomes larger, wherein T is a transmitted torque and r is a radius of the belt on the respective pulley.