| abstract |
Provided is a rolling device which is less likely to cause white tissue peeling even when water enters inside, and which is excellent in durability and reliability. A deep groove ball bearing includes an inner ring 1 having a raceway surface 1a on an outer peripheral surface, an outer ring 2 having a raceway surface 2a facing the raceway surface 1a on an inner peripheral surface, and rolling between both raceway surfaces 1a and 2a. A plurality of rolling elements 3 that are freely arranged, a cage 4 that holds the plurality of rolling elements 3 between the inner ring 1 and the outer ring 2, and a seal that covers an opening of a gap between the inner ring 1 and the outer ring 2 Sealing devices 5 and 5. A grease composition G that lubricates between the raceway surfaces 1a and 2a and the rolling element 3 is disposed in an internal space formed between the inner ring 1 and the outer ring 2 in which the rolling element 3 is provided. . And the relative dielectric constant of this grease composition G is 3 or more. [Selection] Figure 1 |