Tensioner with spring force control

Patent No. 10,077,825 

Issued: September 18, 2018
Filed: March 6, 2014
PCT Filed: March 06, 2014
PCT No.: PCT/US2014/021214
371(c)(1),(2),(4) Date: September 02, 2015
PCT Pub. No.: WO2014/138400
PCT Pub. Date: September 12, 2014
Term Extension: 60 days

Inventor: Todd; Kevin B. (Freeville, NY), Smith; Dale N. (Freeville, NY), Williamson; Robert G (Breesport, NY), O'Shea; Fenton (Groton, NY)
Assignee: BORGWARNER INC. (Auburn Hills, MI)


A tensioner for tensioning a chain or belt 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 or belt tension as low as possible without sacrificing chain or belt control, significantly improving drive efficiency at new chain or belt conditions and conditions with dynamic loads.

Reference to Related Applications

Claims benefit of Provisional Application 61/774,059, filed Mar 7, 2013.


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