Fs1=Fs2+FA.In order to ensure the normal use of the machine, the life of the rolling bearing with the general speed in the machine should be calculated according to its equivalent dynamic load. The direction of Fs is the same as the direction of the reaction force that the outer ring can generate when the inner ring of the bearing is compressed by a pure axial load. The actual fulcrum of the shaft is biased to the inner side of the two fulcrums when it is installed; the actual fulcrum of the shaft is biased to the outer side of the two fulcrums when it is reversely installed.
The equivalent dynamic load of a rolling bearing refers to when the radial load and axial load are combined to act inside the bearing. The rolling element at the lowest position of the Fr line of action has the largest load, while the rolling element far away from the line of action gradually decreases. Together, it is only affected by pure radial load, and then the axial load can be obtained according to formula (1) and formula (2). Therefore, it can be judged whether the bearing is affected by the axial exteal load according to the compression and relaxation state of the bearing.
Comparing the relationship between Fs1 and Fs2+FA, there may be the following three situations: (1) Fs1>Fs2+FA, at this time the shaft is in an unbalanced state under the action of exteal axial load and inteal axial force, the shaft has a tendency to move to the right, the right bearing 2 is compressed, and the left bearing 1 is relaxed. To Figure 3 Axial component force produced by radial load in angular contact bearing Since the nominal contact angle of angular contact bearings is 0°u0026lt;α≤45°, when the inner ring bears pure radial load Fr, due to the existence of α, the reaction force Fi of the outer ring acting on the i-th rolling element in the load zone is not Pointing to the radial direction of the inner and outer rings of the bearing, but along the normal direction of the contact point, it can be decomposed into a radial component Fri and an axial component Fsi.
Load analysis of a single angular contact bearing Shafts installed with category 3 or category 7 angular contact bearings can be subjected to the combined action of axial exteal loads and larger axial exteal loads. Load analysis of angular contact bearings in bearing assembly To find the axial load of the bearing in the bearing assembly, the inteal axial force can be obtained first, and then the characteristics of each bearing's load can be judged according to the inteal axial force and exteal load, and the axial load and radial load can be analyzed.
According to their installation method, they can be divided into a positive installation with the narrow side of the outer ring (Figure 1) wheel bearing kits and a reverse installation with the wide side of the outer ring (Figure 2). Therefore, bearing 1 is only subjected to pure radial load, and its axial load is Fa1=Fs1; while bearing 2 is subjected to the combined action of radial load and axial load, its axial load Fa2>Fs2, and the combined formula (1 ) Available: Fa2=FA-Fa1. The sum of the axial component forces on each rolling element in the load-bearing zone is the inteal axial force Fs of the bearing, and the direction is from the wide side of the outer ring to its narrow side. Take Figure 1 as an example for analysis.