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What are the sliding bearings?
Source: China Bearing Network Time: 2014-09-19
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(1) Radial sliding bearing
a. The gap between the integral shaft and the bearing bush can not be adjusted, the layout is simple, the journal can only be assembled and dismounted from the shaft end. It is usually used on machines with low speed; light load and assembly and disassembly.
b. The gap between the split shaft and the bearing bush can be adjusted; the device is simple. When the machine is difficult to assemble and disassemble; this method is often used.
c. The bearing bush can be properly swayed in the bearing housing; the deflection occurs when the custom shaft is bent. It is used when the transmission shaft is deflected; the joint bearing is suitable for the radial load at the intersection of the rocking members.
(2) thrust sliding bearings are commonly used in flat thrust sliding bearings; because of the lack of liquid conflict conditions; and incomplete fluid smoothness; need to be used with radial bearings. Used to accept axial forces.
(3) Powder metallurgy bearings (oil bearing)
Porous; oil is stored in the pores; it can be smoothed without adding smooth oil for a long period of time; ensuring normal operation; but because the raw material is softer, the load can be lower. For light load; low speed and It is difficult to refuel.
(4) Comparison of plastic bearings and metal bearings; plastic bearings are light in weight; simple in protection; good in chemical stability; high in wear resistance and fatigue resistance; and have vibration damping, sound absorption, self-smoothness, insulation and self-extinguishing. However, the coefficient of thermal expansion is large; the thermal conductivity is low; the hygroscopicity is large; the strength and dimensional stability are not as good as those of metals. It is used in places with low speed or good heat dissipation; the operating temperature should not exceed 65 °C; the instantaneous operating temperature does not exceed 80 °C.
(5) Rubber bearing can absorb oscillation and impact force; wear-resistant and corrosion-resistant in environment with impurities; but its unit strength is lower than metal and low heat resistance; not suitable for high temperature and touch with oil or organic solvent Used in the environment. Bearings used in ship shaft tubes must be operated in a vibration-damping and corrosive environment.
(6) The wooden bearing wood bearing is light and cheap; it can absorb the impact; the sensitivity of the deflection of the shaft. The 慷鹊 既 既 既 约 约 约 褪 褪 20 20 20 20 20 . . . . . . . . . . . . . . Mechanical disc bearings, large ore pump bearings, etc.
2. Fluid smooth bearing (1) The hydrodynamic bearing journal and the outer surface of the bearing work are completely separated by the oil film. The dynamic pressure bearing needs to have: 1 bearing has satisfactory speed, 2 has satisfactory oil supply; smooth oil has certain Viscosity, proper clearance between the 3- journal and the bearing work. Multi-oil wedge dynamic pressure bearing can satisfy the high-precision reversal requirement of the shaft; long service life. It is used for high-speed and high-precision machinery; Wait.
(2) The hydrostatic bearing journal and the bearing are completely separated by the bearing oil of a certain pressure supplied by the outside; the composition of the oil film is not restricted by the relative sliding speed; it is larger at various speeds (including zero speed) Bearing capacity. The stability of the shaft is good; the high-precision reversal demand of the shaft can be satisfied; the conflict factor.
(3) Gas dynamic pressure, hydrostatic bearing gas dynamic pressure, static pressure bearing; use air or other gas as smoothing agent; conflict factor. Enemy 撸豢 æ„€å« å’´ æ„€å« å’´ . .. Gas bearing used as gyro rotor, TV recorder Bearing.
3. No smooth bearing (plastic, carbon graphite bearing)
Work without smooth oil or grease. Use less.
4. Other (1) solid smooth bearing graphite, molybdenum disulfide, indigo dye, polytetrafluoroethylene and other solid smoothing agent smooth. For extremely low temperature, high temperature, high pressure, strong radiation, space, vacuum and other special conditions.
(2) a. Magnetic fluid bearings use magnetic fluid as a smoothing agent.
b. The electrostatic bearing uses a power field to suspend the shaft.
c. The magnetic bearing uses a magnetic field to suspend the shaft.
Mostly used in high speed machinery and appearance.
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