| 摘要 |
PROBLEM TO BE SOLVED: To improve durability of a rolling bearing used under such severe condition as high temperature, heavy load, high speed rotation or the like, and also to serve to improve performance of automobile accessories. SOLUTION: This bearing is constituted of an inner ring 8 made of bearing steel having a inner ring race 11 in the other peripheral surface, an outer ring 9 made of bearing steel having an outer ring race 12 in the inner peripheral surface and balls 10 made of silicon nitride equipped between the inner ring race 12 and the outer ring track 11. A thermal conductivity of this silicon nitride shall be 25 to 45 W/(m.K). The temperature rise is restricted and the deterioration of grease is prevented, so that the purpose is accomplished.
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