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A, pay attention to the mounting direction angular contact bearings. Angular contact bearings having an oval-shaped contact area, and only in one direction, the axial thrust. In the opposite direction bearing assembly, because of the ball rolling in the channel edges, which the loading surface will wear belt groove. Therefore, the installation should pay attention to the correct mounting direction.
B, pay attention to alignment. Ball wear marks deflection direction is not parallel to the raceway that is not installed on the bearing. If the amount of skew> 16000, it could easily cause the bearing temperature rise and the emergence of serious wear and tear. Its causes may be bent shafts, shaft or housing burr, lock nut and screw pressing surface is not perpendicular to the axis and so on. Therefore, the installation should pay attention to check the track jump condition.
C, should pay attention to the correct fit. Bearing inner and outer circumference of the assembly of the contact surface appears like wear or discoloration, is the bearing part with its matching caused too loose. Abrasion produced a pure brown oxide abrasive, and the results will cause further bearing wear, heat and noise and produce a series of topics hop path, so the assembly should pay attention to the correct fit.
Another example is the bottom roller spherical severe wear track, which indicates with tight because the bearing gap becomes smaller, the torque increases, the bearing temperature rise, the bearing quickly and failure due to wear and fatigue. At this point, as long as the proper radial clearance recovery, reducing the amount of interference can solve this problem.
D, normal fatigue failure. In the operation of any surface (eg roller or ball) irregular flaking material and amplitude caused by increased gradually extended, which is a normal fatigue failure. If the ordinary life of the bearing can not meet the requirements, only to re-use more advanced bearings, or progress a bearing specifications to progress bearing capacity.
E, improper lubrication. All require a high rolling bearing lubricant lubrication without interruption, to maintain its design performance. Depend on the bearing body and the seat ring rotating layer formed on the metal film to prevent direct contact between metals. If oiled, can reduce friction, it will not wear.
Bearing in operation state, the viscosity of grease or oil lubrication is critical to ensure their normal; while grease kept clean, free of solid or liquid impurities is crucial. The oil viscosity is too low, sufficient lubrication can not play the role of the seat ring to wear quickly. Initially, the metal seat with rotating body rubbing metal surfaces in direct contact with each other, so that the surface was very smooth and polished? Ensue dry friction? Cause rotating seat surface is the surface of the milled grain crumbs fracturing. Initially darken the surface can be observed, lost to shine, the final form dents and weary flake off. Remedy is in accordance with the bearings need to re-select the replacement of oil or grease.
Oil or grease contamination particulate contamination, even if the particles are smaller than these pollutants uniform film thickness, but the particles are hard? Still produce wear, even through the film, resulting in local stress bearing surface, which significantly shortened bearing life . Oil or grease even if the concentration of water to 0.01% is sufficient to shorten the life of the bearing half of the original. If water is soluble in oil or grease, the bearing life will increase with the concentration of water and reduced. Remedy is to exchange unclean oil or grease; usually a filter should be installed preferably, increase the sealing, storage, installation, cleaning operation attention.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7218C NSK | 90 | 160 | 30 |
| 7218B NSK | 90 | 160 | 30 |