Blade tensioner

Patent No. 6,641,496

Issued: November 4, 2003

Inventors: Tada; Naosumi (Nabari, JP)
Assignee: BorgWarner Inc. (Auburn Hills, MI)
Appl. No.: 022641
Filed: December 18, 2001
Foreign Application Priority Data: Dec 27, 2000[JP] 2000-397946

A blade tensioner includes a blade shoe having a chain slide face, a plurality of blade springs for applying spring force to the blade shoe, and a spacer member interposed between the adjacent blade springs. Each of the blade springs is in the shape of a leaf spring. The blade springs are positioned and layered on the opposite side of the blade shoe from the chain slide face. The spacer member preferably contacts the corresponding blade spring at two contact points apart from each other at a uniform distance. In the blade tensioner of this invention, the blade spring contacts the spacer member at a constant span, which causes the damping coefficient of the whole blade spring to be constant and also causes the damping performance of the blade tensioner to be stable.

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