| 摘要 |
PROBLEM TO BE SOLVED: To provide a resin-made pulley that does not cause temperature increase in connection with decrease of radial clearance of a roller bearing even when it is used under high temperature environment and hence does not shorten the service life. SOLUTION: The inner peripheral surface 21a of a boss part 21 of a pulley body 2 made of synthetic resin is provided with a notch U circumferentially connected to a part corresponding to a track central part C of the outer ring 12 of the roller bearing 1. Thus, even when the outer ring 12 is relatively fastened from the outside by thermal expansion difference between the both during the usage under the high temperature environment, the fastening force does not directly affect to the track central part C of the outer ring 12, and hardly causes decrease of the radial clearance of the roller bearing 1.
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