公开(公告)号：US20170248204A1

公开(公告)日：2017-08-31

申请号：US15504067

申请日：2015-08-18

Applicant: BorgWarner Inc.

Inventor： Sean R. SIMMONS ,  Simon BARRETTE

IPC: F16H7/08 ,  F16H7/12 ,  F16H7/18

CPC classification number: F16H7/0838 ,  F16H7/08 ,  F16H7/0831 ,  F16H7/1209 ,  F16H7/1218 ,  F16H7/18 ,  F16H2007/081 ,  F16H2007/185

Abstract: 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.