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According to the different types of rolling bearings, Swiss precision electromechanical is divided into the following aspects:
A, radial ball bearings
1, inner ring raceway peeling badly worn, cracked on inside and outside the ring.
Ball out of round 2, or surface flaking, cracking.
3, cage wear and severe.
4 there was noise and vibration, rotation, stop and backwards reverse when braking.
5, clearance of the bearing clearance under the maximum value is exceeded.
B, Taper roller bearings
1, inner ring raceway peeling badly worn, cracked on inside and outside the ring.
2, on a roll in the direction of zichang, advance the center of more than 1.5mm, is greater than 2~3 mm outer ring of Taper roller front edge.
3, cage wear on the roller, keep your ring cannot be, cracked, deformed beyond repair.
C radial spherical roller bearings and radial short cylindrical roller bearing
1, inner and outer ring raceways and rollers Crusher wear marks, pits, and deep.
2, cage deformation, rollers cannot be, keep your ring.
3, inside and outside the ring road and the roller clearance greater than 0.06mm.
D, thrust ball bearing
1 Strip, two roller washers, and excessive wear.
2, ball-crushing, or pitting.
3, the serious cage deformation, you cannot keep your ball.
Alternative principles and alternative methods of rolling bearings are as follows:
Alternative principles of a rolling bearing
1, bearing capacity factors and technical parameters, such as permissible static load equal to the original as possible the technical parameters of the bearing. 2, you should select a speed limit is equal to or higher than the original to allow the actual speed of the bearing.
3, alternative bearing precision class, or lower than the original bearing precision class.
4, size the same machine cannot be changed freely because of the replacement and the dimensions of the bearing fit.
5, mounting the bearings of the methods to ensure internal and external cylindrical surface of the inlay sleeve of concentricity and selection of tolerances and fits correctly.
B alternative method of rolling bearing
1, direct replacement
Of alternative bearing inner diameter, outer diameter and thickness dimensions identical to the original bearings, can be installed without any measures to be taken.
2, pad replacement
Substitute bearing inner diameter, outer diameter and the original bearings are exactly the same, only when a narrower width, pad replacement can be used. The washer to add width difference of thickness is equal to the original and alternative bearings. Cushion ring and shaft diameter with clearance fit, od outside diameter of the bearing inner ring. Washers on both ends to parallel, when installing the washer should be close to the shoulder of the shaft.
Generation 1, in wide and narrow
When not with the original bearing dimensions similar to those of alternative housing, you can change the approach of the shaft or housing bore so that it matched with a surrogate bearing. Journal or pore size not too large so as not to affect the amount of processing strength of parts. Using standard left side bearings of the machine, try not to use this method.
2, change the dimensions of the shaft or housing bore
For non-standard bearings have been eliminated, you can change the approach of the shaft or housing bore so that it matched with a surrogate bearing. Journal or pore size not too large so as not to affect the amount of processing strength of parts. Using standard left side bearings of the machine, try not to use this method.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7018A NSK | 90 | 140 | 24 |
| 7918C NSK | 90 | 125 | 18 |