Designed to withstand heavy loads and to increase the service lifetime of machinery by reducing friction and distributing forces, bearings are very vulnerable 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 happen when small particles enter the bearing, causing the contamination of parts or of the lubricating substance. Even very small foreign particles can contaminate the bearing, jeopardizing the service lifetime of the device. These types of bearing damage might be prevented by dealing with the gadgets properly and utilizing the suitable instruments when mounting and dismounting bearings.
ERIKS provides a complete range of bearing tools meant to keep bearings well maintained throughout use, and to ensure the safe mounting and dismounting of bearings.
Bearings mounting process
INSPECT ALL COMPONENTS FOR CONTAMINATION AND DAMAGE
Earlier than mounting the bearings, make positive they are still in the authentic packages, to forestall contamination. Overview the drawings to find out the correct orientation of the bearings in the assembly, and after you have everything ready, unpack the bearings and examine them before mounting. If the bearings have been opened before and there’s a risk of contamination or damage, wash and dry them before mounting.
Check the realm of the machine where the bearings will be mounted: this also must be clean, dry and dust-free. If you should set up housings, shafts or seals, make certain they are clean and mud-free. Check the lubrication holes and threaded holes for traces of substances from earlier ensembles.
NOTE: New bearings may be covered in preservative. In most cases, it’s not mandatory to scrub this off, so long as you wipe off the outside and bore surfaces. Nonetheless, it is necessary to double check if the lubricant you intend to make use of is compatible with the preservative. If not, you have to 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 possibly can 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 earlier than starting the mounting, as the performance of bearings can be severely affected by poorly chosen associated components. The tolerances of bearings are described by tolerance classes, as defined in the ISO 492 (radial bearings) and ISO 199 (thrust bearings) standards. These lessons are vital as they affect the applications of bearings.
As chances are you’ll know, a bearing’s tolerance refers to 3 facets of accuracy: the external dimensional accuracy, the machining accuracy and the running accuracy. The dimensional accuracy provides the bearing’s external dimensions, corresponding to bore diameter, outer diameter, inside 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 another, for example inner and outer ring width variations.
The running accuracy or runout measures the radial runout and axial runout for the interior 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 good choice. Nevertheless, for applications the place more precision is required, you must choose a bearing with a more accurate tolerance class. A tolerance Class 6 means less precision than a tolerance Class four, and a Normal tolerance class is less exact than a Class 6. The tolerance class of the bearing should be chosen based on the application requirements for the beforehand talked about parameters.
Since good bearing performance is dependent upon adherence to the fits for the rings, the collection of the fits have to be achieved before mounting the bearing. The rings ought to be well supported within the assembly, but not too tight, as depending on the application, the interior clearance of the bearing will change. Thus, the clearance must be adapted to the fits. This signifies that besides checking the tolerances, you must also make positive the bearing has the proper clearance and that the fits should not too loose or too tight.
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