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Knowledge of self-aligning roller bearings - how to disassemble bearings without hammer - analysis of reasons for dropping rollers

Knowledge of self-aligning roller bearings - how to disassemble bearings without hammer - analysis of reasons for dropping rollers


Knowledge of self-aligning roller bearings

This kind of bearing is equipped with spherical roller between the outer ring of spherical raceway and the inner ring of double raceway. According to the different internal structure, it can be divided into four types: R, RH, RHA and SR.As the arc center of the outer raceway is consistent with the bearing center, it has the aligning performance, so it can automatically adjust the axis deviation caused by the deflection of the shaft or shell or different centers.It can bear radial load and bidirectional axial load.Especially radial load capacity, suitable for heavy load and impact load.Metal processing wechat, good content, worth paying attention to.Tapered bore bearings can be assembled and disassembled on the shaft by using fasteners or retracting sleeves.The self-aligning roller bearing can bear large radial load as well as certain axial load.The raceway of the outer ring of this kind of bearing is spherical, so it has self-aligning performance. When the axis is bent or tilted by force, the relative tilt of the center line of the inner ring and the center line of the outer ring does not exceed 1° ~ 2.5°, the bearing can still work.

Do you know how to disassemble bearings?

It is hoped that before the installation, the self-aligning roller bearing bearing package will be opened.Lubricating oil lubrication, ordinary also do not have to clean, but instruments or high-speed bearings, to wash with clean oil, remove the rust inhibitor coated on the bearing.General grease lubrication, do not clean, directly filled grease.Furthermore, the bearings that have been sealed with grease are not used directly without cleaning.Removed the anti-rust agent of the bearing, easy to rust, so can not be placed regardless of.When it is installed to the shell, there is usually more clearance matching and interference of the outer ring, which is usually pressed by a press or installed after cooling.When dry ice is used as coolant and cold shrinkage is combined with installation, water in the air will condense on the surface of thrust self-aligning roller bearings.Therefore, appropriate rust prevention measures are needed.

After continuing to run and entering the later period of use, the vibration and noise of the self-alting roller bearing begin to increase, sometimes there are abnormal sounds, but the change of vibration increase is slow. At this time, the kurtosis value of the bearing suddenly reaches a certain value.We believe that at this time the bearing is manifested as initial failure.

At this time, it is required to carry out close monitoring of the self-aligning roller bearing bearing and pay close attention to its changes.Since then, bearing kurtosis value began falling fast, and is close to normal, and significant increase in vibration and noise, it began to accelerate, increasing when the vibration more than standard (e.g., ISO2372 standards), its bearing kurtosis value also began to increase rapidly, when more than vibration standard, and kurtosis value is more than normal (or kurtosis relative standard),We believe that the bearing has entered into late failure production, so it is necessary to timely overhaul the equipment and replace the bearing.

Bearing shows the late fault characteristics to the occurrence of serious failure (generally for bearing damage such as holding shaft, burn, sand shelf spalling, raceway, bead wear, etc.) time is not more than a week, the larger the capacity of equipment, the faster the speed, the shorter the interval.Therefore, in the actual bearing fault diagnosis, once the late fault characteristics are found, the existence of thrust self-aligning roller bearing bearing should be determined and maintenance should be arranged as soon as possible.

Analysis of cause of dropping roller of self-aligning roller bearing

There are three common structures of self-alighting roller bearings, two of which are shown in the figure below. The inner ring 02 has a small retaining edge, distributed on both ends, and each has a roller gap, 180 degrees apart. The gap is convenient to load the appropriate roller 04.Retainers 46 or 66 of this type are generally made of brass.After assembling the finished product, it is necessary to check the turning flexibility of the bearing, but after turning the outer ring 01, it is found that the roller falls off from the cage, or the roller is pulled out with a little force at the gap, and the roller will disengage from the bearing along the gap.

Cause analysis of roller falling off

The general assembly process of self-aligning roller bearings is as following: The outer diameter of cage 46 or 66 sets of inner ring 02 is loaded with appropriate roller 04 from the roller gap on the small rim of the inner ring to form the inner ring assembly, but one or two cage pocket holes are symmetrically left in each row, and rollers are not installed at first.Put the inner component into outer ring 01 and fill the same group of rollers from the gap in the cage pocket hole.While checking the flexibility of rotation, there are some rollers falling off from the cage, or in the gap with a little force, rollers from the gap

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