Bearing, a bearing is the use of pressure to pump pressure to force lubricant into the bearing and shaft pumps a tiny gap between the sliding bearing. Are by the nature of non-full fluid lubricating bearing lubrication, full lubrication bearing, lubrication-free sliding bearings lubricated bearings in a completely fluid, and the other a completely fluid lubricated bearings for the bearing, characterized in any axis Under the rotation speed has a very high precision and high load capacity, but the dynamic pressure bearing and require a complete disadvantage compared to the external pump system.
According to the types of lubricants can be divided into two categories of hydrostatic bearings, mainly using oil as lubricant, and the other is the bearing, using a gas-lubricant, Inner bore hexangular mainly using the air as lubrication agent, and more for the hydrostatic bearings, aerostatic bearings range of teaching small. Mainly used in high speed bodies, such as gyroscopes. Structural lubrication system consists of tanks, lubrication pumps,breadth widened Inner bearings  filters, relief valves, safety valves, accumulators, restrictors,Sheath bearings  oil chamber, oil sealing surface so. Often need to use the range of requirements in the low speed but high load capacity, spin the high accuracy, high speed areas. Such as various heavy-duty machine tools and precision machine tools. Hydrostatic bearing advantages are:
1. Startup and operation of the pressure during the film friction pairs were separated only from the viscous sliding resistance, low coefficient of friction, long working life.
2. Hydrostatic bearing of "all" of the role of error, can reduce the manufacturing inaccuracy of the impact, so the requirements on the manufacturing precision lower than the dynamic pressure bearing.
3. Friction pressure on the surface more uniform, Air-conditioning bearings higher reliability and life of bearings.
4. Can accurately achieve the desired bearing performance. 5. Bearing a more uniform temperature distribution, thermal expansion and dynamic pressure bearing as serious. Hydrostatic bearing condition adapted scope, from the load to gram precision instruments to set Heda thousands of tons of heavy equipment are used hydrostatic bearing.