Tensioner with two-way damper

Patent No. 8,052,559

Issued: November 8, 2011
Filed: August 30, 2007
PCT Filed: August 30, 2007
PCT No.: PCT/US2007/077214
371(c)(1),(2),(4) Date: February 25, 2009
PCT Pub. No.: WO2008/028026
PCT Pub. Date: March 06, 2008

Inventors: Wigsten; Mark M. (Lansing, NY), Smith; Dale (Groton, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)


A tensioner for a power transmission system includes two tensioning arms operatively engaged with the strand of the chain or the belt of the power transmission system. The upper end of each tensioning arm is connected to a two way damper which is pivotally mounted between the upper ends of the tensioning arms. When a pre-determined chain tension overload threshold is reached, the amount of torque required to overcome the coefficient of friction the damper allows the tensioner to adjust the tension in the chain with minimal oscillations and minimal phase change variation.

Reference to Related Applications

Based on Provisional Application 60/824314, filed Sept. 2006


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