Patent ID: 6991570
Filing Date: 2006-01-31
Classification: F16H

Abstract:
1. An improved power transmission belt tensioner of the type having a first pulley adapted to communicate with a surface of a power transmission belt, a first arm supporting said first pulley upon which said first pulley is mounted rotatably about a first axis via a first pulley bearing, a second pulley adapted to communicate with a surface of said power transmission belt, a second arm supporting said second pulley upon which said second pulley is mounted rotatably about a second axis via a second pulley bearing, the improvement comprising: a strut, a first attachment point for said strut, a second attachment point for said strut, said strut attached to said first and second attachment points, said first arm rotatably supported at a first pivot, and adapted to rotate about an axis substantially parallel to said first axis, said second arm rotatably supported at a second pivot, and adapted to rotate about an axis substantially parallel to said second axis, and said first pulley and said first attachment point each being laterally offset in relation to said first pivot and substantially balanced in terms of parasitic torque across said first pivot.