| 摘要 |
A machine tool bearing system is disclosed for grinding machines and the like, wherein a housing has a spindle bore in which is carried a plurality of bearing sets of the rocking shoe segment type. A spindle is rotatably journalled in the bearing sets, and a lower pressure operating fluid is supplied to wet the spindle bearing surfaces. A hydrostatic pressure area is defined on the lowermost of the rocking shoe segments, and fluid at a higher operating pressure is supplied through a check valve system to the hydrostatic pressure area to provide a lifting force to the spindle during start-up conditions. When the spindle reaches its operating rpm., a hydrodynamic pressure is generated in the shoe segments, and serves to provide a stiff support system to the spindle and also serves to shut off the flow from the check valve system. |
