| 摘要 |
PROBLEM TO BE SOLVED: To provide a resin-made pulley that prevents thermal shock from causing a crack in a pulley body and can provide a long service life even when it is used under an environment of repeating high temperature and low temperature. SOLUTION: A plurality of reduced thickness parts (notches or thin parts) S are formed circumferentially at a predetermined interval in a bending part of a boss part 21 of the pulley body 2 bending and adhering to on both end surfaces 12b of an outer ring 12 of a roller bearing 1. Even when difference between coefficients of linear expansion of the roller bearing 1 and the pulley body 2 causes relative telescopic motion of the pulley body 2 to the roller bearing 1 during temperature change, the reduced thickness parts S absorbs the telescopic motion to prevent occurrence of the crack.
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