| 摘要 |
PROBLEM TO BE SOLVED: To improve productivity of a machine tool with a radial roller bearing 1 built in by shortening or eliminating break-in operation after injecting grease 10 to the radial roller bearing 1. SOLUTION: Lubrication coating film 8 is provided on an inner track 4 and an outer track 5 by oil plating or grease plating. In a ring-shape space, the grease 10 is provided at a part closer to both end opening parts in axial direction of the ring-shape space 9 than a part where each ball 7 passes through. With the above structure, temperature rise by stirring resistance of the grease 10 can be restricted in an initial stage of operation and the radial roller bearing unlikely suffers from damage even in the case that rotation speed is increased from the initial stage of the operation. Thus, break-in operation can be shortened or eliminated and productivity of the machine tool can be improved. COPYRIGHT: (C)2006,JPO&NCIPI
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