Oilless Bearing Design Requirements
oilless bearing design requirements
oilless bearing in the work due to the contact between the journal and the bearing will produce friction, resulting in surface heat, wear and even "killed", so the design of bearings, should be used to improve the friction-free oil bearing material bearing, Lubricants and the use of appropriate supply methods to improve the bearing structure to obtain thick film lubrication.
1, tile surface corrosion: spectral analysis found that non-ferrous metal element concentration anomalies; spectrum appeared in many non-ferrous metal components of sub-micron wear particles; lubricants moisture exceeded, acid value exceeded.
2, journal surface corrosion: spectral analysis found that iron concentration anomalies, iron spectrum has many iron components of submicron particles, lubricating oil moisture or acid value exceeded.
3, journal surface tension: iron in the iron cutting grain or black oxide particles, the presence of metal surface tempering color.
4, tile back fretting wear: spectral analysis found that iron concentration anomalies, iron spectrum in many iron components submicron wear particles, lubricating oil moisture and acid value anomalies.
5, the bearing surface strain: iron found in the cutting abrasive, abrasive composition of non-ferrous metals.
6, tile surface peeling: iron spectrum found in many large size fatigue flaking alloy wear particles, layered abrasive.
7, bearing burning tile: iron spectrum in the larger size of the alloy abrasive and ferrous metal oxide.
8, bearing wear: due to the metal properties of the shaft (high hardness, poor concession) and other reasons, easy to cause adhesive wear, abrasive wear, fatigue wear, fretting wear and so on.
Bearings in accordance with the different nature of the friction is divided into rolling (friction) bearings and oilless bearing, it is clear that the rolling bearing is certainly less than the oilless bearing friction, fast start, high efficiency, which is the advantage of rolling bearings.
Compared with oilless bearing, the radial size of rolling bearings is larger, the damping capacity is poor, the life is low at high speed and the sound is bigger. This is its shortcoming.
oilless bearing The most basic structure is divided into bearing and journal (simple structure is obvious).
Sliding friction and rolling friction which is essentially different (one is the point of contact is a surface contact), there will be the essence of the advantages and disadvantages.
Advantages: 1, high carrying capacity; (contact area of the reasons)
2, simple structure, manufacturing, processing, easy to disassemble;
3, good impact resistance and good vibration absorption performance, smooth operation, high rotation accuracy.
Disadvantages: 1, maintenance complex, high requirements for lubrication;
2, the boundary lubrication bearings, friction and wear larger. (Which is also a big difference in contact area)
oilless bearing are used occasions: high-speed, high precision, heavy load, there is a low-speed impact of the machine. In addition, most occasions are widely used rolling bearings.
oilless bearing maintenance decisions are as follows:
(1) surface scrolling, guard, rolling body has obvious scratches.
(2) the cage is worn very clearly, obviously loose or riveted.
(3) runway surface, rolling body rust or scar.
(4) runway surface, the body has a serious indentation or bruises.
(5) inner diameter or outer diameter surface with significant creep.
oilless bearing are bearings that can work in the absence of oil or less oil, rather than the need for refueling, any product if the maintenance done well, can better extend the bearing life. As long as the car does not maintain the normal driving, but will seriously affect the service life. Zhongcheng bearing production of oilless bearing performance can effectively extend the fueling interval, with high compression, wear resistance and excellent lubrication performance for more impurities, polluting work environment is the value of oilless bearing Higher product.