| 摘要 |
PROBLEM TO BE SOLVED: To attain long stabilization of a lubricating function by setting the inside diameter of an inner ring in an antifriction bearing so as to be less than a particular value, and forming an oil guiding part for guiding oil to the raceway surface of a race at the shoulder part of an outer ring. SOLUTION: A ball bearing used in a rotation supporting device is a bearing whose inner ring inside diameter isϕ8 mm or less, namely, a small-diameter ball bearing or a miniature bearing. At a boundary part between the shoulder part 3b2 of an outer ring 3b on the stationary side or an outer ring raceway surface 3b1 and the inside diameter surface 3b3 of the outer ring 3b, an oil guiding part 32 is formed which guides oil to the outer ring raceway surface 3b1. As a result, a lubricating component adhering to the shoulder part of a race is guided to the raceway surface of the race smoothly. Therefore most of sealed lubricant can be used for lubrication of the raceway surface which is the severest lubricating condition. It is thus possible to attain long life of the rotation supporting device.
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