Deep groove ball bearing part load and life

Deep groove ball bearing contact fatigue wear before any components in total revolutions or under a certain speed of total working hours, known as the bearing life of rolling bearing of life varies a lot, with a batch of production of bearings in the same conditions, the life can be a few times or even dozens of times. 90% of the same bearing before fatigue spalling can reach or exceed the total number of turns ( Or working hours) When called rated life L. Rated life for 1 million turn to carry the load for dynamic load rating C. Load bearing of the largest rolling element and raceway contact in the sum of the amount of plastic deformation to one over ten thousand roller diameter, can withstand the rated load as static load C0. The rated load, the greater the bearing load capacity of the stronger. Centripetal bearing rated load is pure radial load, thrust bearing load rating is pure axial load. Actual situation of the bearing load and rated load is different, must be converted to the equivalent load. Under the effect of equivalent dynamic load P, the life of the bearing and the actual load under the condition of the same life. Under the effect of equivalent static load P0, the maximum load of the rolling element and raceway contact place of the total amount of plastic deformation and the actual load under the condition of the same. Rating of the bearing life, the relationship between the equivalent dynamic load and dynamic load rating for the type of epsilon for life index: ball bearing epsilon = 3, roller bearing epsilon = 10/3. When choosing bearing usually take machine long or overhaul period as bearing life expectancy. For example, instead of commonly used equipment for 500 ~ 2000 hours; Continuous use of machine work 8 hours a day for 2 ~ 30000 hours; Every 24 hours of continuous use of the machine for 4 to 100000 hours. Actually reach a life expectancy of only a handful of bearing damage.