Patent ID: 6767303
Filing Date: 2004-07-27
Classification: F16H

Abstract:
An autotensioner comprising:a cup-shaped stationary member that has an opening and a bottom, in which an axial bore is formed; an arm that is attached to said opening, said arm having a rocking shaft which extends to said bottom and is inserted into said axial bore, so that said arm rocks about said rocking shaft, said arm having a stub shaft offset from said rocking shaft and extending in the opposite direction to said rocking shaft; a pulley that rotates about said stub shaft to give a tension to a transmission belt; a compression spring mounted to said arm and configured to bias said arm in a predetermined direction; a first friction member that is provided between an annular wall of said stationary member, which is positioned close to said opening, and a rocking wall formed on said arm, to generate a first frictional resistance by rocking of said arm; and a second friction member interposed between said axial bore and said rocking shaft to generate a second frictional resistance independent of the compression force of said compression spring, by rocking of said arm.