| 摘要 |
PROBLEM TO BE SOLVED: To provide an under-race lubrication bearing greatly improved in a supply amount of lubricating oil to respective sliding sections. SOLUTION: In this under-race lubrication bearing, a retainer 4 has, at both axially longitudinal ends thereof, two annular inclined walls 6, 7 inclinedly extending from an outer ring side toward the outside of the bearing of an inner ring side, and oil supplying holes are formed at the inner ring so as to supply lubricating oil to two hollow spaces defined by the annular inclined walls 6, 7, end faces of a plurality of rolling members, and the inner ring. The annular inclined walls 6, 7 have, on hollow space side surfaces thereof, a plurality of recessed grooves 20 extending from the inner ring side to the outer ring side. It is preferable, in order to increase an amount of the lubrication oil, that the recessed grooves 20 are inclined with respect to a circumferential direction of the hollow space side surfaces of the annular inclined walls 6, 7 in such a manner that the outer ring side end position 20a is on an opposite side of the inner ring-side end position 20b with respect to the rotation direction of the retainer 4. COPYRIGHT: (C)2008,JPO&INPIT
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