Rotational one way clutch chain tensioner with frictional damping

Patent No. 8,105,195

Issued: January 31, 2012
Filed: August 30, 2007
PCT Filed: August 30, 2007
PCT No.: PCT/US2007/077206
371(c)(1),(2),(4) Date: February 25, 2009
PCT Pub. No.: WO2008/028023
PCT Pub. Date: March 06, 2008

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

A tensioner for a power transmission system includes two tensioning arms operatively engaged with a strand of either the chain or the belt of the power transmission system. The upper end of each tensioning arm is connected to a one way rotational clutch which is pivotally mounted between the upper ends of the tensioning arms. The one way clutch rotates in one direction in response to changing chain loads to adjust the tension substantially equally on both strands at the same time. In order to prevent over-tensioning, a damping means is included in the one-way clutch. When a pre-determined overload threshold is reached, the amount of torque required to overcome the coefficient of friction of a spring in the damper allows the one way clutch to slip in the direction opposite from its normal rotational direction, thereby relieving the overload condition on the chain.

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