LUBRICATING STRUCTURE OF ROLLING BEARING

摘要

PROBLEM TO BE SOLVED: To eliminate early seizure and wear by satisfactorily lubricating the rolling elements and raceways and suppress torque variation or temp. change by supplying lubricating oil bit by bit in a small quantity stably even using a spin shot type rolling bearing to a high speed rotating shaft. SOLUTION: Nozzle holes 10 are bored toward the rolling elements 5 from an oil passage 9 in an inner ring spacer 8 as a lubricating structural member, wherein the outer opening of each nozzle hole 10 is notched so that the diameteric end part of a slope 12 continued to the nozzle hole 10 lines inside in radial direction of the rolling elements 5 or the pocket of a retainer 6. A number of crosswise grooves are provided in the inner ring spacer 8 abutting to the inner ring 3 for increasing the surface area, and the cooling effect of the inner ring 3 is heightened to lessen the temp. difference between the inner and outer rings. The opening of each nozzle hole 10 of the oil passage 9 is furnished with a porous sintered substance with a porosity of 10-35% so as to establish stabilized supply of lubricating oil.