Features of Thrust SKF Spherical Roller Bearings

Thrust SKF spherical roller bearings are mainly used in oil drilling rigs, iron and steel machinery, hydroelectric generators, vertical motors, ship propeller shafts, tower cranes, extruders, etc. The cage generally adopts brass solid frame and stamping frame. When the brass solid cage is used, the rear code of the cage is not marked, and the other marks are corresponding to the rear code.

The minimum axial load required when the thrust spherical roller bearing is working,

Famin (take the larger value calculated by the following two formulas)

Famin=C0a/1000

Famin=1.8Fr+1.33( C0a/2000)2×

Where:

Famin: minimum required axial load kN

n: speed

C0a: Basic static load rating kN
The outer ring of the spherical roller bearing and the housing hole of the bearing housing should not adopt interference fit, and the fit between the inner ring and the journal should not be too tight. It is required that the nut should be used for adjustment in the installation to produce a more flexible axial direction. Displacement. If the spherical roller bearing adopts interference fit, it is easy to change the contact angle of the bearing, resulting in uneven bearing load distribution and high temperature rise. Therefore, it is best to fit the inner and outer rings of this type of bearing with the shaft journal and the housing hole of the bearing housing. Generally, it is best to just push the bearing into the journal and housing hole with the thumbs of both hands.

For the installation axial clearance of the spherical roller bearing, it can be adjusted with the adjusting nut on the journal, the adjusting washer and the thread in the bearing seat hole, or the pre-tensioned spring. The size of the axial clearance is related to the arrangement of the bearings, the distance between the bearings, the material of the shaft and the bearing seat, and can be determined according to the working conditions. For high-load and high-speed spherical roller bearings, when adjusting the clearance, the effect of temperature rise on the axial clearance must be considered, and the reduction in clearance caused by the temperature rise must be estimated, that is, the axial clearance The gap should be appropriately adjusted to be larger. For low-speed and vibration-bearing bearings, clearance-free installation or preload installation should be adopted. Its purpose is to make the roller and raceway of the spherical roller bearing have good contact, and the load is evenly distributed, and to prevent the roller and raceway from being damaged by vibration and impact. After adjustment, the size of the axial clearance is checked with a dial indicator. The method is to first fix the dial indicator on the body or the bearing seat, make the dial indicator contacts against the smooth surface of the shaft, push the shaft left and right along the axis, the maximum swing of the needle is the axial clearance value.