| 摘要 |
PROBLEM TO BE SOLVED: To provide a roller bearing generating little charge accumulation and electric corrosion owing to excellent electrical conductivity and resistant to the leakage of grease composition. SOLUTION: An electrically conductive grease composition 6 containing a polyglycol oil and three kinds of carbon blacks is sealed in the space of a deep-groove ball bearing. The first carbon black has an average primary particle diameter of 55 nm, a specific surface area of 29 m<SP>2</SP>/g and a DBP absorption of 130 ml/100g, the second carbon black has an average primary particle diameter of 30 nm, a specific surface area of 800 m<SP>2</SP>/g and a DBP absorption of 360 ml/100g, and the third carbon black has an average primary particle diameter of 24 nm, a specific surface area of 125 m<SP>2</SP>/g and a DBP absorption of 165 ml/100g. COPYRIGHT: (C)2007,JPO&INPIT |
