| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling bearing capable of reducing loss of motive power of a bearing part and realizing high speed rotation with small motive power. SOLUTION: This rolling bearing is used at high speed rotation a dn value which is a product of an inside diameter (d) of an inner ring 1=12 (mm) and working rotating speed 88000 (rpm) of which is more than 1056000. Thereafter, a ball 3 as a rolling element is constituted of a ceramic material density of which is 3-4.5 g/cm3. It is possible to make a ratio of motive power used for rising of rotating speed out of input rotating driving power more than 1.1 times of a steel made bearing at high speed rotation the dn value is more than 1000000 with this rolling bearing. Consequently, it is possible to remarkably reduce loss of motive power of a bearing part in comparison with the steel made bearing and to realize high speed rotation with small motive power.
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