1. The complete fluid lubrication bearing
General use of the grease, oil rope and drops of oil lubrication form, trunnion and bearing surface is not enough lubricant, liquid oil film discontinuous. Simple structure, friction factor is bigger, wear is bigger.
(1) the radial sliding bearing
A. integral
Axis and the gap between bush can't adjust, simple structure, only from the shaft neck shaft installation. General used for low speed, light load and installation allows machine.
B. cutting fraction
Axis and the gap between the bearing can be changed, installation is simple. When the machine installation have difficulty, often use this kind of means.
C. bearings can be in in the bearing the swing of proper, in order to adapt to the shaft in bending generated when the deflection. Used for transmission shaft have skewed occasions, including joint bearings used in each other the stem a junction have swing bear radial load.
(2) thrust sliding bearing
Common graphic thrust bearing, due to a lack of liquid friction conditions, and is in not completely fluid lubrication state, and to the to the heart bearings used at the same time. Used to carry axial force of the occasion.
(3) powder metallurgy bearing (oil bearing)
Has the porous, oil stored in pore, in a relatively long time don't add lubricating oil and can automatic lubrication, ensure the normal work, but because its material is soft, the load bearing capacity is low. Used for light load, low speed and not easy to come on.
(4) plastic bearing
Compared with metal bearing, plastic bearing light weight, convenient maintenance. Chemical stability, wear resistance and resistance to fatigue strength, high, and has the vibration reduction, sound absorption, self-lubricity, insulation and self-extinguishing RTV silicone compound. But large thermal expansion coefficient, low thermal conductivity, hygroscopicity bigger, strength and size stability as metal. Used for high speed or heat dissipation good sex place, working temperature should not be more than 65 ℃, instantaneous temperature not over 80 ℃.
(5) rubber bearing
Can absorb vibration and impact, in the environment of the impurity, wear resistance, corrosion resistance, but the unit's intensity is metal low heat resistance is poor, are not suitable for high temperature and and oil or organic solvent in contact environment with. For Marine shaft bearing vibration reduction of the tube must be and corrosive environment.
(6) wood bearing
Wood bearing light inexpensive, able to absorb the impact of the shaft deflection sensitivity is small, but low strength, thermal conductivity and the anoxic condition, wear resistance is poor. Light load must be used for vibration reduction, such as the agricultural machinery YuanPanBa bearing, big grain of ore pump bearing.
2. Fluid lubrication bearing
(1) liquid dynamic pressure bearing
Shaft neck and bearing a work surface is completely separated from between the oil film. Dynamic pressure bearing must have: (1) bearing have enough speed; (2) have enough fuel supply amount, lubricating oil has certain viscosity; (3) shaft neck and bearing a work surface with appropriate gap between. Many oil wedge dynamic pressure bearing can meet the requirements of the shaft turning high precision, long life. Used for high speed and high precision machinery, such as centrifugal compressor of the bearing.
(2) liquid aero-static bearing
Shaft neck and bearing outside of the supply of oil film bearing pressure must be completely separated, the oil membrane formed from the relative sliding speed limit, in all kinds of speed (including zero speed) are carrying capacity of the larger. Axis of good stability, and can meet the requirements of the shaft turning high precision, small friction coefficient, high efficiency, long service life.
(3) gas dynamic pressure, static pressure bearing
Gas dynamic pressure, static pressure bearing, with air or other gas for lubricant, friction factor small, mechanical efficiency is high, can satisfy the requirement of tell operation. Gas bearing used as a gyro rotor, tivo bearing.
3. No lubrication bearing (plastic, carbon graphite bearing)
No lubricating oil or grease in the state of operation. Application for less.
4. Other
(1) solid lubricating bearings
Use graphite, mos2, green dye, ptfe exception of solid lubricant lubrication. Used for extremely low temperature, high temperature and high pressure, strong radiation, space, vacuum, and other special conditions.
(2) a. magnetic flow with magnetic bearings for lubricant;
B. static electricity the shaft bearing force suspended;
C. with magnetic field magnetic bearing the shaft suspension.
Many used in high mechanical and instrumentation.



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