Torque biased friction hinge for a tensioner

Patent No. 8,226,509

Issued: July 24, 2012
Filed: December 23, 2011

Inventor: Smart; Michael (Locke, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)


A pivot joint for a single blade spring tensioner or double blade spring tensioner generates a biased friction loss at a pivot joint. The friction torque generated in one direction of joint rotation is greater than the friction torque generated in the opposite direction of rotation. In one embodiment, the direction of torque bias at the joints is used to make the damping of the blade spring greater in compression than in extension. High damping in compression and low damping in extension is a desirable characteristic for a tensioner in most applications. The device may be designed to act as a one-way clutch or as a two-way clutch. The device may also be designed to apply large friction torques only when the joint undergoes large amplitude motions (loss of control).

Reference to Related Applications

This is a divisional patent application of co-pending application Ser. No. 12/278,439, filed Aug. 6, 2008, entitled "TORQUE BIASED FRICTION HINGE FOR A TENSIONER", as a U.S. National Stage under 35 U.S.C. 371 of PCT/US07/60947, filed Jan. 24, 2007, entitled "TORQUE BIASED FRICTION HINGE FOR A TENSIONER", which claims one or more inventions which were disclosed in Provisional Application No. 60/765,777, filed Feb. 7, 2006, entitled "TORQUE BIASED FRICTION HINGE FOR A TENSIONER", Provisional Application No. 60/822,520, filed Aug. 16, 2006, entitled "SELF-ENERGIZING BRAKE FOR A TENSIONER", and Provisional Application No. 60/863,815, filed Nov. 1, 2006, entitled "BLADE TENSIONER WITH OPPOSING SPANS". The benefit under 35 USC .sctn.119(e) of the United States provisional applications is hereby claimed, and the aforementioned applications are hereby incorporated herein by reference.

Co-pending application Ser. No. 12/278,439 is also a continuation-in-part patent application of copending PCT application number PCT/US2007/060941, filed Jan. 24, 2007, entitled "BLADE TENSIONER WITH OPPOSING SPANS". The aforementioned application is hereby incorporated herein by reference.

Co-pending application Ser. No. 12/278,439 is also a continuation-in-part patent application of copending PCT application number PCT/US2007/060945, filed Jan. 24, 2007, entitled "SELF-ENERGIZING BRAKE FOR A TENSIONER". The aforementioned application is hereby incorporated herein by reference.


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