The purpose of bearing lubrication:
The purpose of lubrication of rolling bearings is to reduce internal friction and wear of the bearings, to prevent sticking, and the lubricating effect is as follows.
(1) Reduce friction and wear.
In the mutual contact portion of the ferrule, the rolling element and the retainer constituting the bearing, metal contact is prevented, and friction and wear are reduced.
(2), prolong the fatigue life.
The rolling fatigue life of the bearing is prolonged when the rolling contact surface is well lubricated during rotation. Conversely, if the oil viscosity is low and the thickness of the lubricating oil film is not good, it is shortened.
(3), discharge friction heat, cooling.
The circulation oil supply method or the like can be used to discharge heat generated by friction or heat from the outside to cool. Prevent the bearing from overheating and prevent the lubricant from aging itself.
(4), other
There is also the effect of preventing foreign matter from entering the inside of the bearing or preventing rust and corrosion.
Lubrication method:
The lubrication method of the bearing is divided into grease lubrication and oil lubrication. In order to make the bearing function well, first, choose a lubrication method that suits the conditions of use and the purpose of use. Lubricity of oil lubrication predominates if only lubrication is considered. However, grease lubrication has the advantage of simplifying the structure around the bearing and comparing the advantages and disadvantages of grease lubrication and oil lubrication.
Cylindrical Roller Bearings
The cylindrical roller is in line contact with the raceway, and has a large radial load capacity, which is suitable for bearing heavy loads and impact loads. It is also suitable for high-speed rotation of N-type and NU-type axial movement, and can be adapted to thermal expansion or installation error. The change of the relative position between the shaft and the outer casing is most suitable for the free end bearing type NJ and NF type to withstand a certain degree of unidirectional axial load. The NH type and NUP type can withstand a certain degree of bidirectional axial load inner or outer ring. Separable, easy to assemble and disassemble NNU type and NN type, strong rigidity against radial load, mostly used for machine tool spindle
Mainly applicable cages:
Steel stamping cage (Z-shaped), copper alloy cutting cage, pin cage, synthetic resin forming cage
The main purpose:
Medium and large motors, generators, internal combustion engines, gas turbines, machine tool spindles, reduction gears, loading and unloading machinery, various industrial machinery
Solid needle roller bearing
The basic structure of the inner ring bearing is the same as that of the NU type cylindrical roller bearing, but due to the use of the needle roller, the volume can be reduced, and the large radial load can be withstood without the inner ring bearing. The mounting surface of the shaft with appropriate precision and hardness should be used as the mounting surface. Raceway surface
Mainly applicable cages:
Steel stamping cage
The main purpose:
Automotive engines, transmissions, pumps, excavator track wheels, hoists, overhead cranes, compressors
Tapered Roller Bearings
This type of bearing is equipped with a circular table-shaped roller. The roller is guided by the large rib of the inner ring so that the apexes of the conical surfaces of the inner ring raceway surface, the outer ring raceway surface and the roller rolling surface intersect on the bearing center line. One-point single-row bearing can withstand radial load and one-way axial load. Double-row bearing can withstand radial load and two-way axial load. It is suitable for bearing heavy load and impact load. It is divided into small cone according to contact chest (α). Three types of angle, middle cone angle and large cone angle, the larger the contact angle, the greater the axial load capacity. The outer ring and inner component (inner ring and roller and cage assembly) can be separated for easy assembly and disassembly, rear auxiliary The bearing code "J" or "JR" has international interchangeability. This type of bearing also uses the British series.
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