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. Due to this fact, improper dealing with or incorrect mounting and dismounting can damage the weather of a bearing, inflicting excessive noise and vibration levels, and affecting the bearing rotation.
The same can happen when small particles enter the bearing, causing the contamination of parts or of the lubricating substance. Even very small overseas particles can contaminate the bearing, jeopardizing the service life of the device. These types of bearing damage might be prevented by handling the devices properly and using the appropriate tools when mounting and dismounting bearings.
ERIKS provides a complete range of bearing tools intended to keep bearings well maintained during use, and to ensure the safe mounting and dismounting of bearings.
Bearings mounting process
INSPECT ALL COMPONENTS FOR CONTAMINATION AND DAMAGE
Before mounting the bearings, make positive they're still within the authentic packages, to prevent contamination. Evaluation the drawings to determine the right orientation of the bearings in the assembly, and after getting 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 the place the bearings will be mounted: this also must be clean, dry and dirt-free. If it's worthwhile to install housings, shafts or seals, make positive they are clean and mud-free. Check the lubrication holes and threaded holes for traces of gear from earlier ensembles.
NOTE: New bearings may be covered in preservative. In most cases, it’s not necessary 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 propose to make use of is appropriate with the preservative. If not, it's essential to wash and dry the bearing earlier than mounting it. This doesn’t apply to bearings with seals and shields.
When all this is done, 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 items within the assembly should be checked earlier than starting the mounting, as the performance of bearings might be severely affected by poorly chosen related 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 vital as they influence the applications of bearings.
As chances are you'll know, a bearing’s tolerance refers to a few points of accuracy: the exterior dimensional accuracy, the machining accuracy and the running accuracy. The dimensional accuracy offers the bearing’s exterior dimensions, similar to bore diameter, outer diameter, internal 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 selecting 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 inside 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 superb choice. However, for applications the place more precision is needed, it is best to choose a bearing with a more accurate tolerance class. A tolerance Class 6 means less precision than a tolerance Class 4, and a Normal tolerance class is less precise than a Class 6. The tolerance class of the bearing must be chosen primarily based on the application necessities for the beforehand talked about parameters.
Since good bearing performance relies on adherence to the fits for the rings, the collection of the fits have to be done earlier than mounting the bearing. The rings needs 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 implies that besides checking the tolerances, you must also make certain the bearing has the proper clearance and that the fits usually are not too loose or too tight.
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