| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a structure capable of securing sufficiently insulation performance, even when forming a ceramic insulation coating 4b on an outer ring 2 of a large roller bearing 1b having a large surface area. <P>SOLUTION: The ceramic insulation coating 4b mainly composed of alumina is formed on the outer circumferential surface 12 and both end faces 13, 13 in the axial direction of the outer ring 2. The insulation film 4b is restricted so that its insulation resistance value is 1,000 MΩ or more, and that its capacitance is 27 nF or less. Hereby, the performance of the insulation film 4b can be secured sufficiently, even if the surface area is large. <P>COPYRIGHT: (C)2008,JPO&INPIT |
