| 摘要 |
A bearing unit capable of withstanding a large axial force based on a simple structure including: a bearing 10 having an internal ring 13 fitted to an inside member 2 , an outer ring 14 fitted to an outside member 6 , lots of rolling elements 15 disposed between the outer ring 14 and the inner ring 13 ; and a transmitting direction shifting means A transmitting an axial force F from the inner ring 13 to the outside member 6 when the axial force F transmitted from the inside member 2 to the internal ring 13 exceeds a predetermined value or above, and a main spindle device of a machine tool, which is provided with the bearing unit, are provided.
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