Patent ID: 8052559
Filing Date: 2011-11-08
Classification: F16H

Abstract:
1. A tensioner for a continuous loop power transmission system of an internal combustion engine, the continuous loop consisting of a chain having a first strand and a second strand, each strand located between a drive sprocket connected to a driveshaft and at least one driven sprocket connected to at least one camshaft, comprising: a) a first tensioning arm having a first end, a second end for pivotally mounting to the engine and a chain sliding surface operatively engaging the first strand of chain; b) a second tensioning arm having a first end, a second end for pivotally mounting to the engine and a chain sliding surface operatively engaged with the second strand of chain, c) a two way damper comprising: d) a first linkage coupling the first yoke pin to the first tensioning arm and a second linkage coupling the second yoke pin to the second tensioning arm; such that when installed upon an engine the torsion spring imparts a biased torque, creating a pivotal motion of the two-way damper about the center bushing, causing the first linkage and the second linkage to move laterally to draw the first tensioning arm and the second tensioning arm inward to apply tension to the first strand and the second strand of the chain; and wherein compression of the center bushing stack by tightening the mounting pin creates a drag which resists the pivotal motion, between the upper flange of the center bushing with the upper tensioner yoke and the lower flange of the center bushing with the lower tensioner yoke.