Tensioner with spring force control in a second bore

Patent No. 9,683,637

Issued: June 20, 2017
Filed: December 2, 2013
PCT Filed: December 02, 2013
PCT No.: PCT/US2013/072574
371(c)(1),(2),(4) Date: June 11, 2015
PCT Pub. No.: WO2014/099327
PCT Pub. Date: June 26, 2014

Term Extension: 179 Days

Inventors: Todd; Kevin B. (Freeville, NY), Smith; Dale N. (Freeville, NY) 
Assignee: BorgWarner Inc. (Auburn Hills, MI)

A tensioner for tensioning a chain span which uses two pistons. The movement of the two pistons may be coupled together. The first piston provides damping to the chain span and a second piston provides variable, dominant and automatically adjusting spring force to the chain span. The tensioner automatically adjusts the mean tension force to keep the chain tension as low as possible without sacrificing chain control, significantly improving drive efficiency at new chain conditions and conditions with dynamic loads.

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