Single row bearings are classified according to the number of rows of rollers, bearing with a row of rollers.Double row bearing, bearing with two rows of rollers.Multi-row bearing, bearing with more than two rows of rolling body and bearing the same direction load, such as three row, four row bearing.Classified separable bearings according to whether the parts can be separated, bearings with separable parts (such as tapered bearings, joint bearings, etc.) non-separable bearings, bearings in the matching, the rings are not free to separate the bearings.According to the size of the classification of miniature bearings, nominal outside diameter size range in 26mm below the bearing.Small bearings, nominal outside diameter size range in 28~ 55mN bearings.Small and medium-sized bearings, the nominal outside diameter size range of 60~ 115mm bearings.Medium and large bearings, the nominal outside diameter size range of 120~ 190mm bearings.Large bearings, nominal outside diameter size range of 200~ 430mm bearings.Extra large bearings, bearings with nominal outer diameter of more than 440mm.Bearing is an indispensable part in most machinery, which has the role of supporting rotation.According to the different properties of friction in bearings, it can be divided into two kinds of bearings (rolling bearings) and (sliding bearings).Both kinds of bearings have their own characteristics in structure, and their respective advantages and disadvantages in performance. When choosing, they can be considered in combination with the actual use.

The cage is made of phenolic laminated cloth tubes with tolerance classes 5, 4 and 2.Therefore, this kind of bearing has high rotation accuracy and limit speed, small friction, low temperature rise.3. Bidirectional thrust angular contact ball bearings are usually 230000 type bidirectional thrust angular contact ball bearings with a contact Angle of 60°, which are composed of a seat ring with lubricating oil hole, two shaft rings, a spacer ring and two groups of steel balls and cage components.Selecting the proper height of the spacer can make the bearing have the required pre-load after assembly.

Bearing seals, usually seal bearing seals in no special requirements when the use of nitrile rubber is more.The seals of this material also have a temperature range of -30 degrees to 120 degrees.Fluoroelastomer seals can withstand a temperature of 180 degrees Celsius.Grease, FAG bearing temperature rise, will affect the viscosity of grease.And whether the grease after the viscosity change can meet the application conditions, we need to carry out the corresponding check.Usually the temperature range of sealed bearing medium temperature grease is about -30 ℃ to 120 ℃.Electrical engineers can choose low temperature grease, high temperature grease, wide temperature grease, etc.