The speed limit bearing generally refers to the highest speed can reach under the following conditions:
1, bearing tolerance level 0;
2, bearing clearance for the 0 group;
3, the bearing load to rated load is 10% (0.1C);
4, the lubrication and cooling conditions normal;
5, radial bearings only bear radial load, roller bearings only bear the axial load;
6, the outer temperature not exceeding 100 DEG C.
Usually, the calculation steps of ball bearing life:
1 according to the technical parameters and bearing parts of the structure of the host, type and size of primary INA bearing, acting on the bearing load calculation;
2 Calculation of equivalent dynamic load;
3 according to the rated life calculation formula of bearing bearing life;
The static load and the speed limit of 4 checking rated.
Rolling bearing rating life refers to a group of bearings in the bearing can reach or exceed 90% in fatigue spalling before running number (to 106 RPM meter) or under a certain speed of working hours.
For the basic rating life of ball bearings:
L10= (Cr/Pr) 3 (million transfer)
In actual calculation, generally with the working hours that the bearing life (hours), as:
Lh= (Cr/Pr) 3/ (60N) *106 (hours)
Where Cr: radial basic dynamic load http://www.tanchin.hk/hk-bearing-3-105.html rating (KN), refers to the constant radial load a roller bearing imaginary can bear, the basic rating life in this load one million rpm.
Pr: dynamic equivalent radial load (KN), refers to various INA actual bearing by plus the equivalent radial load variable load.
For the basic rating life of roller bearings:
L10= (Cr/Pr) 10/3 (million transfer)
Said bearing life with working hours (H):
Lh= (Cr/Pr) 10/3/ (60N) *106 (hours)
Rated life calculation method is determined according to the ordinary INA bearing steel and the general working conditions, life reliability for 90%. Considering the influence of materials and the conditions of use and the requirements of high reliability, the international organization for standardization to correct rated life formula, joined the reliability coefficient, coefficient of material and using condition coefficient.