| 摘要 |
PURPOSE:To prevent an oil film from being cut off, by using dynamic pressure, which is caused by the rotation of a thrust plate, to carry the weight of a rotary portion even in power outage and by suppressing the temperature rise of a thrust bearing with a cooling fluid, which is supplied simultaneously with the power outage, to limit the temperature of the bearing below a prescribed level and by supplying lubricating oil through hydraulic port etc. CONSTITUTION:The pressure reception surface 26 of a thrust bearing 20 is provided with a plurality of radial grooves 27 which have a depth (h) of 30-50mum and are defined by gradient lands 28, 28'. A parallel land 29 is provided between the adjacent grooves 27. A solenoid valve 35 is opened simultaneously with power outage so that a cooling fluid flows into cooling fluid holes 33 from a source 34 through pipes 36, 37 to cool the pressure reception surface 26 of the thrust bearing 20 to maintain the temperature of the bearing 20 at a prescribed level. This results in preventing an oil film from being cut off. |
