| 摘要 |
An insulative resin coating film 9 of the range of 10 to 40 mum thick is formed, by electrodeposition coating, on the outer surface of a pulley 2 inclusive of an outer surface 2E of the iron pulley 2 which is in sliding contact with a belt 3 and an inner surface 2I fit to a rotary shaft 4. With formation of the insulative resin coating film, an electrical resistance after 10 hours of the unit running is 1MOMEGA or larger. A static electricity caused by a friction between the pulley 2 and the belt 3 is -1kV or lower. As a result, a potential difference between the rolling element and the race ring (outer ring or inner ring) is 1V or lower.
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