Oil lubrication methods mainly include: oil bath lubrication, oil dripping lubrication, circulating oil lubrication, jet lubrication, oil and gas lubrication, etc. Through the circulation of the lubricating oil, a lot of heat is taken away. The lubricants commonly used in rolling bearings include mineral oil base and synthetic oil base. These lubricants are generally divided into the following categories: bearing oil, steam turbine oil, hydraulic oil, gear oil, internal combustion engine oil, compressor oil, etc. How to choose the type of lubricating oil, in addition to the equipment itself, also consider bearing and what kind of friction pairs co-exist in a mechanism. The main basis of rolling bearing and lubrication are: the structure and type of rolling bearing, installation form and accuracy requirement, working parameters and equipment requirements (bearing rotating speed, load, temperature and the device type, etc.), bearing work environment, lubrication, etc.
The influence of rolling bearing structure on lubrication is mainly material of rolling bearing components. In general, rolling bearings are made of steel material. For this kind of bearings, lubricating oils containing extreme pressure additives (such as gear oil) can be considered. But there are a few bearings use soft metal and other materials, and try not to choose this kind of bearing with extreme pressure additives of lubricating oil, should be chosen and material compatible lubricants, such as turbine oil, air compressor oil, etc.).
The rolling bearing is divided into radial bearing and thrust bearing according to its bearing direction. Radial bearings are generally used to support shafts, while thrust bearings are used to withstand axial load - oriented shafts. General lubricants can be used for radial bearings, while for thrust bearings, extreme pressure anti-wear lubricants with high viscosity should be used as far as possible. If the radial bearing limits the viscosity of the lubricating oil, the viscosity of the selected lubricating oil of the thrust bearing should be 1-2 grades higher than that of the lubricating oil for the radial bearing. In addition, according to different rolling body, rolling bearing is divided into ball bearing, roller bearing and needle bearing. Roller bearing to choose higher than ball bearing 1 ~ 3 grades of lubricating oil viscosity, the choice of needle bearing lubricating oil basically the same as the roller bearing, but should consider the needle roller bearing is used in what components.
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