Patent ID: 7517295

Claim:
A pair of conical disks for a belt-driven conical-pulley transmission, which pair of conical disks includes: an input shaft which is rigidly connected to a fixed disk, a movable disk which is carried on the input shaft so that it is axially movable and rotationally fixed relative to the shaft, a torque sensing device with an outer shaped surface that is rigidly connected to the shaft and an inner shaped surface that is rigidly connected to a sensing piston that encircles the shaft and is axially movable and rotatable relative to the shaft, wherein the shaped surfaces are formed so that when there is a change in effective torque acting between the sensing piston and the movable disk the axial position of the sensing piston changes by the rolling of rolling elements on the shaped surfaces, wherein the sensing piston includes axially directed arms circumferentially spaced from each other on a side of the sensing piston facing away from the movable disk, wherein the arms include axially-extending teeth that mesh with axially-extending teeth of an input wheel rotatably mounted on the shaft and axially fixed, and a support ring in contact with the arms on a surface radially opposite the axial teeth of the arms, wherein the supporting ring urges the teeth of the arms to mesh with the teeth of the input wheel.