The journal and the bearing are completely separated by a load medium of a certain pressure supplied from the outside, thereby reducing the relative friction between the journal and the bearing. The formation of the dielectric film body is not limited by the relative sliding speed, at various speeds (including zero speed). , have a large carrying capacity.
Depending on the medium, hydrostatic bearings can be classified into hydrostatic bearings and hydrostatic bearings.
The spindle float is the displacement value of the hydraulic pressure formed by the pressure oil entering the oil chamber and the balance of the spindle or load, and the spindle floats.
Hydrostatic bearing is an oil film bearing that uses external oil source to generate load bearing capacity. Dynamic and static pressure hybrid bearing is a new multi-oil wedge oil film bearing that combines the advantages of hydrodynamic and hydrostatic bearings and overcomes two shortcomings.
The utility model utilizes the throttling principle of the hydrostatic bearing to generate a sufficient static bearing capacity in the pressure oil chamber, thereby overcoming the wear of the main shaft and the bearing caused by the dry friction occurring when the hydrodynamic bearing starts and stops, and improves the main shaft. And the bearing life and accuracy retention; bearing oil chamber mostly adopts 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 bearing capacity of the spindle. The multi-cavity opposing structure greatly increases the spindle stiffness; the homogenization of the high-pressure oil film and good anti-vibration performance ensure the spindle has high rotation precision and smooth running.
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Label: Principle of hydrostatic bearings
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