Patent ID: 6050911
Filing Date: 2000-04-18
Classification: F16H

Abstract:
An infinitely variable speed transmission comprising:a first and a second V-belt pulley arranged on a first and a second transmission shaft, respectively, each of said V-belt pulleys having an axially fixed pulley part and an axially movable pulley part;a continuous V-belt operatively connecting said first and said second V-belt pulleys, said V-belt having generally axially-facing friction surfaces which contact respective friction surfaces of said V-belt pulleys to transmit a torque between said first and said second transmission shafts at a variable transmission ratio therebetween;a first contact pressure adjusting device operatively connected to the axially movable pulley part of said first V-belt pulley, said first contact pressure adjusting device being configured to generate a first variable contact pressure force on the axially movable pulley part of said first V-belt pulley as a function of at least one outside operating parameter;a second contact pressure adjusting device operatively connected to the axially movable pulley part of said first V-belt pulley, said second contact pressure adjusting device being configured to generate a second variable contact pressure force on the axially movable pulley part of said first V-belt pulley as a function of at least one of said torque and said transmission ratio, said first and said second contact pressure adjusting devices being separately connected to said axially movable pulley part of said first V-belt pulley such that said first and said second contact pressure forces act separately on said axially movable pulley part of said first V-belt pulley; anda third contact pressure adjusting device operatively connected to the axially movable pulley part of said second V-belt pulley, said third contact pressure adjusting device being configured to generate a first variable contact pressure force on the axially movable pulley part of said second V-belt pulley as a function of at least one of said torque and said transmission ratio.