| 摘要 |
PURPOSE:To lengthen a life span by forming a dynamic pressure generating groove to prevent inflow of a pressure fluid to the side of a dynamic pressure bearing between the dynamic pressure bearing and the pressure fluid, to blow a fluid between both of cylindrical sliding members on the rotary side and the fixed side and to flow the fluid to the side of the pressure fluid through an oil sealing means. CONSTITUTION:When a pump shaft 9 is rotated, as a rotary side cylindrical ceramic sliding member 92a is rotated, a function to pump a fluid 94 in a fluid reserve room 93 to the side of a pressure fluid is generated by a unidirectional dynamic pressure bearing 92. The fluid 94 in the fluid reserve room 93 passes a radial gap between the rotary side dynamic pressure bearing constitutional element 92a and a fixed side cylindrical ceramic sliding member 92b and is flowed unidirectionally to the side of the pressure fluid through an oil sealing means 33. Consequently, as the oil sealing means 33 and the unidirectional dynamic pressure bearing 92 constitute a means to pass the fluid 94 unidirectionally, it is possible to constitute a perfect pressure proofed and water proofed sealing system. Even in the case of high speed rotation, the rotation axis and the bearing make contact with each other in line, it is possible to lengthen a life span and to lower noise and oscillation. |
