Mechanical chain tensioner with compliant blade spring

Patent No. 7,641,577

Issued: January 5, 2010
Filed: June 28, 2005

Inventors: Markley; George L. (Montour Falls, NY), Crockett, II; John T. (Etna, NY), Turner; Timothy A. (Johnson City, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)


A tensioner for imparting tension to a chain having a body, a resilient chain guide element, at least one blade spring, and at least one bracket. The body of the tensioner has a surface with a profile of the path of a new chain and a groove found longitudinally along the length of the surface. The resilient chain guide element, on the surface of the body has a chain contact surface and two ends wrapped around the ends of the body, with the chain guide being sufficiently larger than the body, such that the chain contact surface is capable of being biased away from the body. The blade spring is present in the groove with its end in the containments means of the groove, biasing the chain guide out and away from the body.

Reference to Related Applications

This application is related to an application filed simultaneously, entitled "PIVOTING MECHANICAL BLADE TENSIONER WITH COMPLIANT BLADE SPRING", now US patent 7,479,077. The aforementioned application is hereby incorporated herein by reference. The application is also related to application Ser. No. 10/984,450 filed Nov. 9, 2004, entitled "COMPLIANT SNUBBER" and application Ser. No. 10/692,182 filed Nov. 9, 2004, entitled "Complaint Chain Guide With Blade Spring", now US patent 7,063,635.  The aforementioned applications are hereby incorporated by reference.


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