Disk set arrangement for a chain-type CVT

摘要

The invention relates to a disk set arrangement with a driving disk set and a driven disk set for a chain-type CVT, wherein each disk set of said arrangement comprises two disks that are axially displaceable relative to one another on a shaft and a chain arrangement comprising thrust pieces that are active between said disks. The longitudinal axis of said thrust pieces runs parallel to the rotational axis of the shaft, and the frictional surfaces of the disks and the thrust pieces have a curvature determined by a radius and an eccentricity, wherein the eccentricity of the disk in the driving disk set is different to that of the driven disk set.

主权项

1. A disk set arrangement for a chain-type CVT, comprising:
an input disk set rotatable about an input axis of rotation, the input disk set having an input shaft rotatable about the input axis of rotation and two input disks movable axially relative to one another on the input shaft, the two input disks having friction surfaces; an output disk set rotatable about an output axis of rotation, the output disk set having an output shaft rotatable about the output axis of rotation and two output disks movable axially relative to one another on the output shaft, the two output disks having friction surfaces; and a chain arrangement with cradle thrust pieces, one of the cradle thrust pieces acting between the input disks and the other of the cradle thrust pieces acting between the output disks, the cradle thrust pieces each having a longitudinal axis which runs parallel to the input axis of rotation and the output axis of rotation, respectively, wherein a cross section of each of the friction surfaces of the input disks through the input shaft has a curvature defined by a radius with a center offset from the input axis of rotation by a distance, wherein the distance is an eccentricity, wherein a cross section of each of the friction surfaces of the output disks through the output shaft has a curvature defined by a radius with a center offset from the output axis of rotation by a distance, wherein the distance is an eccentricity, wherein the eccentricity of the input disks differs from the eccentricity of the output disks; and wherein the curvature of the disks of at least one of the input disk set and the output disk set is defined by a ratio between the eccentricity of the curvature of the disks of the at least one of the input disk set and the output disk set and the radius of the disks of the at least one of the input disk set and the output disk set, which ratio lies in a range of 0.145 to 0.20, thereby optimizing both acoustic properties and contact between the cradle thrust pieces and the input disk set and the output disk set.