TENSIONER WITH EXPANDING SPRING FOR RADIAL FRICTIONAL ASYMMETRIC DAMPING

摘要

Tensioners provide tension to the endless power transmission elements, such as belts, chains, or other continuous loops, which may be part of the power system. The tensioner includes an arm arbor rotatable about a first axis and having a window passing therethrough, a bushing positioned adjacent to the arm arbor with a protrusion received in the window of the arm arbor, and coupled to the power transmission element And a spring for urging the arm to engage the tensioned portion and rotating about the first axis. The spring is positioned such that it extends in contact with the protrusion of the bushing such that the bushing is urged radially outward with respect to the arm arbor to provide friction damping when the arm is rotated in the direction opposite the tensioning engagement direction.