Factors of bearing life
Author: hongyuanTime:
The life of a rolling bearing refers to the cumulative number of revolutions, accumulated working hours, or mileage of a bearing after a set of bearings has started to run, and the components such as rolling elements, inner and outer rings, or cages show the first signs of fatigue expansion. Life is the most important design criterion and usage index of rolling bearings. How to determine the life of rolling bearings more accurately is always one of the important research directions in the bearing technology field, and it is also a long-term concern in the engineering community.（HONBbearing02）
2.Surface plastic deformation
3. Abrasion
4.Corrosion
5.Burn
6.Cracks and defects
2.Lubricating. Good lubrication can maintain the smooth running of bearings.
3.Temperature. Under high temperature environment, the oil film is easy to be damaged, the use of high temperature grease, or oil and gas lubrication, can improve the bearing life. In addition to the impact of environmental factors, sliding bearings continue to rotate, their own will also generate a lot of heat, to fully consider the heat dissipation.
4.Installation accuracy. Excessive coaxiality or improper pretensioning will affect bearing life.
5.Load. Different types and different specifications of bearings can bear different radial / axial loads, and they should be controlled within a reasonable range. Roller bearings of the same dimensions can withstand higher loads than ball bearings.
6.Vibration and shock. Fluid lubricated bearings with good vibration damping, shock and vibration resistance under proper lubrication.
7.Material. Poor lubrication or squeezing between materials with similar characteristics under dry friction conditions can cause fretting corrosion.
8.Surface treatment. Liquid nitrogen hardening, phosphating, polytetrafluoroethylene, molybdenum can improve the wear resistance of bearing parts.
Common failure forms of rolling bearings：
1.Fatigue spalling2.Surface plastic deformation
3. Abrasion
4.Corrosion
5.Burn
6.Cracks and defects
Factors affecting bearing life
1.Seal. Under severe working conditions, if the bearing is directly exposed to the external environment, the bearing’s life will be damaged. For bearings in some special positions, bearings with sealing rings can be used to seal the lubricant in the bearings.2.Lubricating. Good lubrication can maintain the smooth running of bearings.
3.Temperature. Under high temperature environment, the oil film is easy to be damaged, the use of high temperature grease, or oil and gas lubrication, can improve the bearing life. In addition to the impact of environmental factors, sliding bearings continue to rotate, their own will also generate a lot of heat, to fully consider the heat dissipation.
4.Installation accuracy. Excessive coaxiality or improper pretensioning will affect bearing life.
5.Load. Different types and different specifications of bearings can bear different radial / axial loads, and they should be controlled within a reasonable range. Roller bearings of the same dimensions can withstand higher loads than ball bearings.
6.Vibration and shock. Fluid lubricated bearings with good vibration damping, shock and vibration resistance under proper lubrication.
7.Material. Poor lubrication or squeezing between materials with similar characteristics under dry friction conditions can cause fretting corrosion.
8.Surface treatment. Liquid nitrogen hardening, phosphating, polytetrafluoroethylene, molybdenum can improve the wear resistance of bearing parts.
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