Force limiting tensioning arm

Patent No. 8,052,558

Issued: November 8, 2011
Filed: January 30, 2007
PCT Filed: January 30, 2007
PCT No.: PCT/US2007/061279
371(c)(1),(2),(4) Date: August 11, 2008
PCT Pub. No.: WO2007/095420
PCT Pub. Date: August 23, 2007

Inventor: Markley; George L. (Montour Falls, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)


A tensioner for a chain driven power transmission system of an internal combustion engine, having a ratchet as part of the tensioning system is disclosed. The tensioner contains at least one bracket that is pivotally mounted to the engine adjacent one strand of the chain. The bracket contains a chain guide element that maintains forceful slideable engagement with the chain. Between the chain guide element and the bracket are an elongated support member having a pre-loaded spring force and an elongated resilient pad. The resilient pad quickly compresses in response to spikes or surges in chain tension absorbing the force of the spike.

Reference to Related Applications

This application is a continuation in part of application Ser. No. 11/168,049, filed on Jun. 28, 2005, now US Patent 7,479,077 entitled "Pivoting Mechanical Tensioner With A Compliant Blade Spring". Further, this application claims one or more inventions which were disclosed in Provisional Application No. 60/774,360, filed Feb. 17, 2006, entitled "Force Limiting Tensioning Arm". The benefit under 35 USC 119(e) of the United States provisional application is hereby claimed. The aforementioned applications are hereby incorporated by reference.


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