| 摘要 |
PROBLEM TO BE SOLVED: To suppress a noise generated during operation of a double row ball bearing 17 regardless of a offset load applied to the double row ball bearing 17 from a pulley 16. SOLUTION: An angular face-to-face duplex bearing is used as the double row ball bearing 17. Even when an outer ring 22 tends to incline based on the offset load, clearance is not produced between each of outer ring raceway tracks 26, 26, inner ring raceway tracks 29, 29 and each of rolling contact surfaces of balls 15, 15. As a result, each of outer ring raceway tracks 26, 26 and inner ring raceway tracks 29, 29 does not violently collide with each of rolling contact surfaces of balls 15, 15. As a result, generation of the noise is prevented.
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