| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing and its unit having an excellent energization characteristic with reduced noise, at a low cost. SOLUTION: This electric sintered bearing unit comprises an electric sintered bearing 50, a shaft 51 inserted into an inner periphery of the electric sintered bearing 50, and washers 51, 52 as main elements. The electric sintered bearing 50 is formed in the cylindrical shape with a porous material made of sintered metal, inner pores of which are impregnated with conductive oil. With rotation of the electric sintered bearing 50, the conductive oil with which its inner pores are impregnated seeps into a clearance between surface openings on an inner peripheral surface 50a and an outer peripheral surface of the shaft 51 to form an oil membrane. By the oil membrane of the conductive oil, the rotation of the electric sintered bearing 50 is supported by the shaft 51 without contact, and simultaneously electric charge supplied to the shaft 51 is fed, in the order of the shaft 51 → the oil membrane (conductive material in the oil membrane) →the electric sintered bearing 50. |
