Under a certain load, the number of revolutions or hours experienced by the bearing before pitting is called the bearing life.
The life of a rolling bearing is defined in revolutions (or hours of work at a certain speed) : the bearing within this life shall suffer initial fatigue damage (peeling or defect) on any bearing ring or rolling body.However, whether in laboratory tests or in actual use, it can be clearly seen that the actual life of the same bearing with the same appearance under the same working conditions is very different.In addition, there are several different definitions of bearing "life", one of which is the so-called "working life", which means that the actual life of a bearing can be achieved before the damage is caused by wear and tear. The damage is usually not caused by fatigue, but by wear, corrosion, sealing damage and other reasons.
In order to determine the standard of bearing life, the bearing life is linked to reliability.
Due to the difference in manufacturing accuracy and material uniformity, even if it is the same material and the same size, the same batch of bearings are used under the same working conditions, and their life length is not the same.If statistical life is taken as 1 unit, the longest relative life is 4 units, the shortest is 0.1-0.2 units, and the ratio of the longest to the shortest life is 20-40 times.90% of bearings do not produce pitting corrosion, and the number of revolutions or hours experienced is called the rated life of bearings.
Main uses of angular contact ball bearings
Single-row angular contact ball bearings can only bear axial loads in one direction.When this kind of bearing bears pure radial load, because the rolling body load line and radial load line of action are not in the same radial plane, the internal axial component force is generated, so it must be installed and used in pairs.
Single row angular contact ball bearing is mainly used in machine tool spindle, high frequency motor, combustion turbine, centrifugal separator, small car front wheel, differential pinion shaft, booster pump, drilling platform, food machinery, dividing head, welding machine, low noise type cooling tower, mechanical and electrical equipment, coating equipment, machine tool slot plate, arc welding machine
The design of double row angular contact ball bearings is basically the same as that of single row angular contact ball bearings, but occupies only a smaller axial space.Double row angular contact ball bearings can bear radial load and axial load acting in two directions, it can limit the axial displacement of the shaft or shell bidirectional, the contact Angle is 30 degrees.High rigidity bearing configurations can be provided and can withstand overturning torque.
Double row angular contact ball bearings can bear large radial loads, radial and axial combined loads and torque loads, which limit the axial displacement of both sides of the shaft.It is mainly used to limit the axial displacement of shaft and housing.
Double row angular contact ball bearing is mainly used for oil pump, roots blower, air compressor, all kinds of transmission, fuel injection pump, printing machinery, planetary reducer, extraction equipment, cycloid reducer, food packaging machinery, electric welding machine, electric, square box, gravity type spray gun, wire stripping machine, axle shaft equipment, chemical machinery, testing analysis
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