| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling bearing capable of retaining a lubrication performance for a long period of time without feeding a lubricant in the case where a temperature of used environment is high as 400-500 deg.C. SOLUTION: A nitride layer comprising a diffusion layer and a compound layer having Vickers hardness (Hv) of 900 or more is formed on surfaces of an inner ring 1 and an outer ring 2 made of iron-steel material. The nitride layer is formed on a surface of a ball 3 made of steel material and a coating film comprising any metal selected from Ag, Pb, In and In-Ag is further formed thereon. |
