| 摘要 |
PROBLEM TO BE SOLVED: To provide a robot rolling bearing effectively preventive of separation at its rolling surface due to hydrogen brittleness. SOLUTION: The robot rolling bearing 1 for rotatably supporting a rotating portion of an industrial robot comprises an inner ring 2 and an outer ring 3, and a plurality of rolling elements 4 laid between the inner ring 2 and the outer ring 3. Around each of the rolling elements 4, sealing members 6 are provided at both axial end opening portions 8a, 8b of the inner ring 2 and the outer ring 3 for sealing a grease composition 7. The grease composition 7 is formed by mixing additive agent into base grease consisting of base oil and thickener. The additive agent contains at least one aluminum additive agent selected from aluminum and an aluminum compound. The mixing rate of the aluminum additive agent is 0.05-15 pts.wt relative to 100 pts.wt of the base grease. COPYRIGHT: (C)2008,JPO&INPIT
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