The choice of rolling bearing with grease or oil - bearing knowledge

Rolling bearing has both rolling friction and sliding friction. Sliding friction is due to the deviation on the surface curve of the rolling element bearing and the bearing deformation under load. Between roller and ring, for example, because of the ball and ring is not absolutely rigid, they always produce elastic deformation of contact area, theory of point contact and line contact, but in fact the load working conditions always into surface contact, so contact with different diameter has different linear velocity produced by sliding friction. Also because of various reasons can make the roller and retainer and retainer and produce sliding friction between inner and outer ring. And sliding friction increases with the increase of speed and load, in order to reduce the friction and wear, reduce the temperature, noise, prevent rust bearing components, correctly selecting lubricant and adopt reasonable lubrication method, appropriate control of lubricant quantity is a important subject to improve bearing life. 1, the basis of rolling bearing oil or grease: rolling bearing has the advantages of using lubricating oil: 1) Under certain operating norms, use of lubricating oil is larger than that of grease lubrication starting torque and low friction losses significantly. 2) Heat can be taken away because of lubricating oil in a loop cooling effect, so can make the bearings to achieve relatively high rotational speed. 3) To ensure the use of higher temperature. 4) In fat, must remove the connecting parts, oil lubrication, no such trouble. 5) Bearing with lubricating oil in the gearbox is very appropriate, because the oil at the same time, in the form of splash lubrication of gear and bearing at the same time. 6) Grease in the bearing gradually be wear and tear of the product, abrasive products, from the outside after sealing device penetration and aging product contamination by itself, if not timely replacement, accelerate cause bearing wear, and the application of liquid lubricant, can be filtered and ensure its normal operation. The advantages of roller bearing with grease lubrication: 1) Individual bearing point, must often go with the hand, such as switch to fat is both convenient and can avoid the accident caused by short of oil. 2) The fat itself has sealing function, which can allow the sealing degree is not high simplifies the design of institutions. 3) Experience has shown (to a certain speed range N2, rolling bearing lubrication theory foundation, the lubricating mechanism of rolling bearings is belong to the theory of elastic liquid dynamic pressure lubrication. 3, rolling bearing and lubrication failure type relationship: most of the failure reason is because there is something wrong with assembly, the damage is sealed. A handful of the cause of the failure is due to the lack of or excess lubricant or substandard etc caused by the wear, agglutination, corrosion and overheating, etc. 4, the basic characteristics of the grease and to choose the standard of the grease: choosing grease, must choose and use conditions, Temperature, velocity, load and environment, etc. ) Adapt to grease, these are related to the basic characteristics of the grease, but the basic characteristics of the grease depends on the thickener and the type of base oil.