Rotational tensioner with stored energy and damping feature

Patent No. 10,094,450

Issued: October 9, 2018
Filed: August 18, 2015
PCT Filed: August 18, 2015
PCT No.: PCT/US2015/045617
371(c)(1),(2),(4) Date: February 15, 2017
PCT Pub. No.: WO2016/028730
PCT Pub. Date: February 25, 2016

Inventor: Simmons; Sean R. (Cortland, NY), Barrette; Simon (Lansing, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)


A tensioner uses a low rate torsion spring in a first stage and a high rate torsion spring in a second stage to maintain tension in a chain or belt. The first stage is connected to the second stage by a torque coupling. The high rate torsion spring is maintained in an energized state between a ground and a dead stop to store energy and to provide tension under high loads. In some embodiments, the torque coupling is a damper. In other embodiments, the torque coupling is a clutch. A method stores energy in a high rate torsion spring of a tensioner.

Reference to Related Applications

Claims benefit of Provisional Application 62/039,503 filed August 20, 2014.


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