How To Adjust Tapered Roller Bearings?

- Jul 07, 2020-

Preload is the amount of rotational force per inch (pound) required to rotate the shaft when a tapered roller bearing is tightened properly. It is most commonly measured in inches per pound, but also in pounds per square inch, pounds - per square foot and pounds of pressure. So instead of tearing out the tools to replace the tapered roller bearings from the inside, the effort involved in preparing and assembling the bearings can extend their service life and reduce the downtime of the cutters. 


This is because the pre-tensioning force of the tapered roller bearing has a considerable influence on the rotational force of the shaft as well as on the speed of the bearing. It is therefore necessary to determine the exact ratio of the prestressing force to the speed and rotation time of each bearing. 

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In order not to damage the new bearing, both the bearing and the inner bearing must be pressed into the shaft at the same time. Push the outer race against its bear and push it down, e.g. with a round nut, or push it down with the end cover of the bearing. The inner ring of each bearing is fixed, positioned and clamped and pressed (as such with round nuts). 


The conical bearing shells of the outer race should be driven into the shaft with a special aluminum driver. Most bearings have a built-in shaft bearing or bearing bore, which means that both types of bearings need to be pressed and driven. If the bearing is knocked out of kilter, the rollerball can crush the bearing and cause premature failure. 


In order not to damage the new bearing, the bearing of the inner race must be pressed into the shaft and the outer race pressed against the bear. 


Most bearings have approximately a 0.001% interference fit built into the axle shaft between the bearing and bore, which means that both types of bearings need to be pressed and driven in. The conical bearing shells of the outer race should be driven by a special aluminum driver. The hammering of the bearings can cause the ball to snuff out the bear race and cause premature failure. 


As a service technician or remodeler, you must pay attention to the control of the assembly and the associated assembly settings. Many conventional bearing types consist of a number of individual components due to the installation method used. Separable components require you to control the resulting assembly adjustment, which can be done by inserting components and spacers into the assembly. 


The installer or warehouse supplier then processes the spacers to a controlled width, specifically designed for assembly and production. Several different distance types are available for mounting a roller wheel. 


Excessive tightening of the locknuts, also known as excessive preload, can lead to the kind of rapid, deep flaking that can be seen in the picture. Too much loosening of a locknut leads to excessive tightening, which allows a rocking motion that disrupts the even distribution of force between the roller and rips chunks off the raceway during roller operation. Deep splintering can also occur when direct contact with rollers and raceways due to excessive pre-tensioning superheats the bearings, softens the material, and causes breakages and breaks during race track and roller operation. 

Preload is defined in the text as the continuously rotating shaft required to continuously rotate the shaft when a tapered roller bearing is tightened correctly. It is very important to have a good understanding of the prestressing and prestressing conditions of piping roller bearings. The preload most often measures the amount of pressure between the locknut and the bearing shaft or the torque difference between a roller and a track. 


Tapered roller bearings with preload have a higher preload than tapered roller bearings without preload and can be improved by increasing the preload. If the friction is high, the bearing is difficult to start, the efficiency is low and the rotational accuracy is not high, then the relative start-up is relatively easy. On the other hand, if the pre-tensioning forces are small relative to the locknut and the track, the speeds are high and the rotational accuracy high. In the case of abutted roller bearing with low pre-tensioning force and high pre-tensioning force, friction is not low and rotates at high speed, so efficiency and efficiency are low. 


The pre-tensioning force cannot be changed, but this method is easy to use and has a wide range of uses, so it can be easily adjusted. 

This can also be used when the external load is fixed, as in the case of a heavy load or even in a high-pressure environment.