| 摘要 |
PROBLEM TO BE SOLVED: To allow the extension/retraction of a shaft during operation when used on the rear side of a spindle and an assembly error and always properly perform air oil lubrication utilizing an inner ring sloped surface part by increasing an allowable range for the axial displacement of a nozzle member from an inner ring. SOLUTION: The sloped surface part 2b larger in diameter on the rolling surface 2a of the inner ring 2 is formed on the outer diameter surface of the inner ring 2 of a cylindrical roller bearing 1. A nozzle member 6 is installed on the sloped surface part 2b through a clearanceδ. An circumferential groove 7 is formed in the sloped surface 2b of the inner ring 2, and an air oil delivery hole 8 opening oppositely to the circumferential groove 7 is formed in the nozzle member 6. The width face 5b of a cage 5 holding the rollers 4 of the cylindrical roller bearing 1 is positioned between the bottom part 7b and the inner ring width face 2c of the circumferential groove 7 in the sloped surface 2b of the inner ring 2. COPYRIGHT: (C)2004,JPO&NCIPI
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