Bearings mounting guide
Designed to withstand heavy loads and to extend the service lifetime of machinery by reducing friction and distributing forces, bearings are very inclined to shocks and heavy impacts. Subsequently, improper dealing with or incorrect mounting and dismounting can damage the weather of a bearing, causing excessive noise and vibration levels, and affecting the bearing rotation.
The identical can occur when small particles enter the bearing, causing the contamination of parts or of the lubricating substance. Even very small international particles can contaminate the bearing, jeopardizing the service lifetime of the device. These types of bearing damage will be prevented by dealing with the devices properly and using the precise tools when mounting and dismounting bearings.
ERIKS provides a complete range of bearing tools meant to keep bearings well maintained throughout use, and to make sure the safe mounting and dismounting of bearings.
Bearings mounting process
INSPECT ALL COMPONENTS FOR CONTAMINATION AND DAMAGE
Before mounting the bearings, make sure they are still in the unique packages, to prevent contamination. Overview the drawings to determine the proper orientation of the bearings in the assembly, and upon getting everything ready, unpack the bearings and examine them earlier than mounting. If the bearings have been opened before and there’s a risk of contamination or damage, wash and dry them earlier than mounting.
Check the world of the machine where the bearings will be mounted: this also needs to be clean, dry and mud-free. If it's essential to install housings, shafts or seals, make sure they're clean and dust-free. Check the lubrication holes and threaded holes for traces of drugs from previous ensembles.
NOTE: New bearings may be covered in preservative. In most cases, it’s not needed to wash this off, so long as you wipe off the outside and bore surfaces. However, it is necessary to double check if the lubricant you propose to make use of is compatible with the preservative. If not, you must wash and dry the bearing earlier than mounting it. This doesn’t apply to bearings with seals and shields.
When all this is completed, you may go to the second step of the process.
CHECK THE TOLERANCES OF ALL ELEMENTS IN THE ASSEMBLY
The dimensional and geometrical tolerances of the pieces within the assembly should be checked before starting the mounting, because the performance of bearings will be severely affected by poorly chosen associated components. The tolerances of bearings are described by tolerance lessons, as defined within the ISO 492 (radial bearings) and ISO 199 (thrust bearings) standards. These classes are essential as they influence the applications of bearings.
As it's possible you'll know, a bearing’s tolerance refers to three aspects of accuracy: the exterior dimensional accuracy, the machining accuracy and the running accuracy. The dimensional accuracy gives the bearing’s external dimensions, similar to bore diameter, outer diameter, inner ring width and outer ring width. This parameter is essential for figuring out the shaft and housing fits in a bearing assembly.
The machining accuracy gives the precision of the manufacturing process and is necessary when choosing tolerances for shafts and housings. This parameter measures the variation in dimensions when comparing one bearing to a different, for example inner and outer ring width variations.
The running accuracy or runout measures the radial runout and axial runout for the internal and outer ring, the side runout for the inner ring and the outer diameter runout for the outer ring. This parameter is vital for minimizing vibration and misalignment in an assembly.
NOTE: For applications that require moderate rotation and operational speed, bearings with a Regular tolerance class are a very good choice. However, for applications the place more precision is needed, you need to select a bearing with a more accurate tolerance class. A tolerance Class 6 means less precision than a tolerance Class four, and a Regular tolerance class is less precise than a Class 6. The tolerance class of the bearing should be chosen based mostly on the application requirements for the previously mentioned parameters.
Since good bearing performance will depend on adherence to the fits for the rings, the selection of the fits should be achieved before mounting the bearing. The rings should be well supported in the assembly, but not too tight, as relying on the application, the internal clearance of the bearing will change. Thus, the clearance should be adapted to the fits. This signifies that besides checking the tolerances, you also needs to make certain the bearing has the proper clearance and that the fits usually are not too loose or too tight.
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