| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive bearing unit to be able to inject a lubricant toward the inside a bearing for high-speed rotation corresponding to an outer ring rotation. SOLUTION: The bearing unit rotatably supports a rotator 36 around a fixing shaft 34. The bearing unit comprises a plurality of inner rings 46 externally fitted along the fixing shaft, an annular shaft sleeve (a seat 42 between inner rings) externally fitted into the fixing shaft adjoining mutually adjacent inner rings, an outer ring 48 secured to the rotating body opposite to a plurality of the inner rings connected via the shaft sleeve (the seat 44 between the outer ring), and a plurality of rollers 50 rotatably assembled between the inner and outer rings. A continuous annular recessed groove 42g is circumferentially formed at the inside diameter side in the shaft sleeve (the seat between the inner rings). At least one nozzle 42n is pierced from the recessed groove toward between the inner and outer rings in order to inject the lubricant introduced in the recessed groove toward between the inner and outer rings. COPYRIGHT: (C)2008,JPO&INPIT
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