Patent No. 8,277,347

Priority Application: June 29, 2006 (Japan)
PCT Filed: May 30, 2007
PCT No.: PCT/JP2007/061410
Entered National Stage in US: December 19, 2008
PCT Pub. No.: WO2008/001587
PCT Pub. Date: January 03, 2008

Inventors: Barrette; Simon (Lansing, NY), Miyake; Kazuyuki (Mie, JP)
Assignee: BorgWarner Morse TEC Japan K.K. (Nabari-shi, JP)

The present invention is directed to decrease the impact sound of the ratchet mechanism generated at the time of piston retraction. The tensioner includes a piston 3 slidable in the piston bore 2a of the housing 2 and an expandable circlip member 5 engageable with the engagement groove 3a of the piston 3. The piston bore 2a has a guide groove 20 formed therein that has front and rear stop surfaces 20a, 20b adapted to contact the circlip member 5. The engagement groove 3a is formed by a round seat portion S.sub.0 that the circlip member 5 is adapted to seat, a piston-retraction restricting portion S.sub.0S.sub.1 that is formed on the front side of the round scat portion S.sub.0 and a piston-advance permitting portion S.sub.0S.sub.2 that is formed on the front side of the round seat portion S.sub.0. The piston-retraction restricting portion S.sub.0S.sub.1 permits the circlip member 5 to travel a short distance toward the front side along the rear side stop surface 20b to allow for an enlargement of the circlip member 5 and to restrict retraction of the piston 3 when the piston 3 retracts and the circlip member 5 contacts the rear side stop surface 20b of the guide groove 20.

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