The principle of hydrostatic bearings: the journal and the bearing are completely separated by a bearing medium with a certain pressure supplied from the outside, thereby reducing the relative friction between the journal and the bearing, and the formation of the medium film is not affected by the relative sliding speed limit, it has a large carrying capacity at various speeds (including zero speed). Depending on the medium, static pressure bearings can be divided into liquid static pressure bearings and gas static pressure bearings. Spindle float refers to the displacement value at which the spindle floats when the hydraulic force formed by pressure oil entering the oil chamber reaches balance with the spindle or load. Static pressure bearings are oil film bearings that use external oil sources to generate load-bearing capacity. Hydrostatic pressure hybrid bearings are a new type of multi-oil wedge oil film bearings that combine the advantages of hydrodynamic pressure and static pressure bearings and overcome the shortcomings of both. It uses the throttling principle of the hydrodynamic bearing to generate a large enough static pressure bearing capacity in the pressure oil chamber, thereby overcoming the dry friction that occurs when the hydrodynamic bearing starts and stops, causing the wear of the spindle and the bearing, and improving the spindle And the service life and accuracy maintenance of the bearing; most bearing oil chambers adopt a shallow cavity structure. After the spindle is started, the dynamic pressure bearing capacity and static pressure bearing capacity formed by the shallow cavity step effect are superimposed, which greatly improves the spindle bearing capacity. The multi-cavity opposed structure greatly increases the stiffness of the spindle; the homogenization effect of the high-pressure oil film and good anti-vibration performance ensure that the spindle has high rotation accuracy and smooth operation. At present, in the renovation of old precision grinding equipment, the WMB type surface throttling hydrodynamic and static pressure hybrid bearings from Beijing AVIC Equipment Renovation Factory are used more.
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