| 摘要 |
PURPOSE:To provide a rotary shaft with high reliability, high rigidity and a fine aligning performance by forming recesses on the face of a rotary shaft and designing the shaft to have a mechanism for controlling a difference between pressures in the opposed recesses. CONSTITUTION:Four recesses 13a to 13d are arranged at the same intervals in the circumferential direction on a rotary shaft 11. Pressure oil is supplied via orifices 16a and 16c into one couple of opposed recesses 13a and 13c from common oil supply holes 18a and 17a, while supplied via orifices 16b and 16d into the other couple of opposed recesses 13b and 13d from common oil supply holes 18b and 17b. When controlled pressure oils Ps1 and Ps2 are supplied into the oil supply holes 18a and 18b, respectively, the rotary shaft 11 and a bearing 12 constitute an oil static pressure journal bearing. By precisely controlling the supplied pressures Ps1 and Ps2, the axis of the rotary shaft may be shifted from the alignment to an arbitrary extent. to achieve rotation and revolution of the shaft. |
