| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling bearing having an excellent conductivity and hard to generate the decrease of conductivity with time. SOLUTION: A ball bearing is constituted of an inner ring 1, an outer ring 2, a plurality of balls 3 rotatably disposed between the outer ring 2 and the inner ring 1, a cage 4 retaining the balls 3, and seal plates 5, 5 fitted to the seal groove 2b of the outer ring 2. A conductive grease G is charged in the space 6 surrounded by the inner ring 1, the outer ring 2, and the seal plates 5, 5 and enclosed hermetically in the ball bearing by the seal plates 5, 5. The conductive grease G contains a base oil, a thickener composed of at least one of a metallic soap and an urea compound, conductive carbon black finer than 2μm in average particle size, and inorganic particles of 2μm or finer in average size. |
