Patent ID: 7896764

Claim:
A transmission noise attenuation device for a bearing assembly of a belt-driven conical-pulley transmission having a chain acting as an endless torque-transmitting means, said bearing assembly comprising: a bearing for rotatably supporting a shaft and including a bearing outer ring having a cylindrical outer surface; a bearing housing having a housing inner surface, wherein the bearing housing receives and supports the bearing; and a plurality of coaxial, axially spaced cam rings positioned between and in contact with the housing inner surface and with the bearing outer ring outer surface, wherein the cam rings are radially elastically deformable to allow a limited radial movement between the bearing housing inner surface and the bearing outer ring outer surface and include inner, circumferentially-spaced cam surfaces that contact the bearing outer ring outer surface and outer, circumferentially-spaced cam surfaces that contact the bearing housing inner surface, wherein the inner and outer cam surfaces are positioned radially opposite each other, wherein the inner and outer cam surfaces are in constant contact with the bearing outer ring outer surface and the bearing housing inner surface, respectively, and wherein the limited radial movement is between 0.1 mm and 0.02 mm.