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Performance and Characteristics of Spherical Roller Thrust Bearings

Time:2020.01.15  Source:Roller Bearings Suppliers


Spherical roller thrust bearings are the same as spherical roller bearings. Therefore, it has an automatic centering function and is not very sensitive to coaxiality and shaft flexure.


Thrust spherical roller bearings are different from other thrust bearings in the catalog. This type of bearing has a very large axial load capacity. It can also bear several radial loads while bearing axial loads, but the radial load not allowed to exceed 55% of the axial load.


As long as the loads P and P0 do not exceed 0.05C0, and the shaft ring rotates, the bearing allows the alignment angles listed in the table below.


bearing 02.png


Bearing diameter series self-aligning angles bearing diameter series self-aligning angles 200 series 1° - 1.5° 300 series 1.5° - 2° 400 series 2° - 3° small values are suitable for larger bearings, and allowable when the load increases the alignment angle will decrease.


Oil lubrication is generally used for spherical roller thrust bearings.


Thrust tapered roller bearings can only bear the unidirectional axial load and can limit the unidirectional axial displacement of the bearing so that it can be used as unidirectional axial positioning. Compared with thrust cylindrical roller bearings, the bearing capacity is large, and the relative sliding is small, but the limiting speed is low.


Performance and characteristics of thrust spherical roller bearings:


1. The outer ring of the spherical roller thrust bearings and the housing of the bearing housing should not adopt an interference fit, and the inner ring and the journal should not be too tight. When adjusting the nut, it should be able to produce more flexible axial displacement.


If the spherical roller thrust bearing adopts an interference fit, the contact angle of the bearing is likely to change, resulting in uneven bearing load distribution and high-temperature rise. Therefore, the installation and coordination of the inner and outer rings of this type of bearing with the journal and bearing housing hole should generally be best with the thumbs of both hands that can push the bearing into the journal and housing hole.


bearing 01.png


2. For the axial installation clearance of the spherical roller bearing, it can be adjusted by adjusting nut on the journal, adjusting washer and the thread in the bearing seat hole, or by pre-tensioning the spring and so on. The dimension of the axial clearance is related to the arrangement of the bearing, the space between the bearings, and the materials of the shaft and the bearing seat, which can be determined according to the working conditions.


For high-load and high-speed spherical roller thrust bearings, when adjusting the clearance, the effect of temperature rising on the axial clearance must be considered, and the amount of clearance reduction caused by temperature rise must be taken into account, that is, the axial travel gap should be adjusted appropriately to be larger.


For bearings with low rotation speed and vibration, install without clearance or install with preload. The purpose is to make the roller and the raceway of spherical roller thrust bearing have good contacting, and the load is evenly distributed to prevent the roller and the raceway from being damaged by vibration and shock. After adjustment, the amount of axial clearance is checked with a dial indicator. The method is to firstly fix the dial indicator on the fuselage or the bearing seat, make the dial indicator contact the smooth surface of the shaft, and push the shaft left and right along the axial direction.


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