| 摘要 |
PROBLEM TO BE SOLVED: To provide a power transmission device, where the entry of foreign matters into a fitting portion between a pulley and a hub is prevented to prevent abnormal wear of the fitting portion. SOLUTION: The power transmission device comprises the pulley 1 and the hub 2 consisting of an inner hub 21, an outer hub 23 and a torque transmitting elastic member 22. In such a manner that part of the elastic member embraces a rear side portion of the outer hub, a hub side engaging portion 24 whose outer face is in an irregular shape is irregularly fitted to a pulley side engaging portion 12 in an irregular shape formed on the inner face of a pocket portion 11 provided corresponding to the outer hub on the front side end face of the pulley to form an irregular fitting portion. An annular dust entry preventing portion 26 is provided to cover the front face of the irregular fitting portion. COPYRIGHT: (C)2006,JPO&NCIPI
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