Blade-type tensioner

Patent No. 6,902,505

Issued: June 7, 2005
Filed: February 3, 2003 
Foreign Priority Date: February 26, 2002 (Japan)

Inventors: Yonezawa; Shinichi (Nabari, JP); Sakamoto; Naoji (Nabari, JP)
Assignee: BorgWarner Morse TEC Japan K.K. (Nabari, JP)


A blade-type tensioner for applying tension to a chain comprising a base, an arcuately shaped blade shoe having a chain sliding face, a spring provided on a back side of the blade shoe, and a guide member. The blade shoe has a proximal end portion and a distal end portion, where the proximal end portion is swingably supported on the base, and the distal end portion is slidably supported on a slide plate of the base. The slide plate is arcuately shaped to form a concavely arcuate arc face on an opposite side of the distal end portion of the blade shoe, and the distal end portion of the blade shoe has a convexly arcuate arc face corresponding to the concavely arcuate arc face of the slide plate. The distal end portion of the blade shoe is guided by a self-aligning action of the concavely arcuate arc face of the slide plate in such a way that the distal end portion is centrally positioned in a lateral direction on the slide plate. The guide member comprises a pair of guide portions formed integrally on opposite side edges of the distal end portion of the blade shoe, and hang below opposite side ends of the slide plate.


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