Bearings main factors is the installation and adjustment, maintenance, repair and other maintenance meets the technical requirements. According to the SKF bearing installation, use, maintenance, maintenance of the technical requirements to be monitored and examined, abnormal immediately find reasons to adjust the operation of SKF bearings to withstand load, speed, temperature, vibration, noise and lubrication conditions, to return to normal. Installation conditions is one of the primary factors in the factors bearing is often caused by improper installation by the stress state changes between the various parts of the package bearing, bearing operation in the normal state and early termination of the service life of internal factors refers to the three major factors determine the quality of the bearing structure design, manufacturing process and quality of materials.
1, the choice of the bearing clearance: buy bearings usually only told what type, grade, rarely interested in the bearing clearance request, the business conditions of use must ask clear SKF bearings, bearing speed, temperature, with tolerances are directly related to the choice of the bearing clearance. The general rotational speed of 3500 rev / min motor they use the CM clearance, such as high temperature speed motor requires a relatively large clearance. Bearing clearance after assembly because of the narrowing of the large and cylindrical bore up and lead to a reduction in clearance interference reduction = 60% (bearing housing with the exception of aluminum). Such as bearings before assembly clearance is 0.01mm, the amount of interference in the assembly of 0.01mm, the bearing clearance after assembly to 0.004mm. Zero clearance bearing noise and life will achieve the best state in theory, but in the actual operation taking into account the temperature rise and other problems, the bearing clearance after assembly is preferably 0.002mm-0.004mm.
2 grease of choice: the choice of grease is based on SKF bearing speed, temperature, noise requirements and starting torque to choose, know much about the business performance of a variety of oils and fats.
3, the choice of bearing models: Bearing Model by the user′s technical staff in accordance with the conditions of use of complementary products and the load bearing SKF choice. Business people understand the user′s actual load is consistent whether the selected bearing, cylindrical roller bearings reach the requirements, should advise clients to re-election as soon as possible models, but unless special products in the selection model is generally not a problem.
4, bearing seal type choice: SKF bearing lubrication can be divided into oil lubrication and grease. Oil-lubricated bearings are generally used form of bearings, grease lubricated bearings generally used shields or rubber seals seal. Dust cover suitable for high or use the good parts, seals sub-contact seal and non-contact seals two the contact seal dustproof performance is good but starting torque, a non-sealed small starting torque, but the sealing performance There is no contact.
Bearing materials metallurgical quality of the main factors is the impact of early bearing failure. With the advances in metallurgical techniques (such as bearing steel vacuum degassing, etc.), the quality of raw materials is improved. Factors in the quality of raw materials in the bearing failure analysis of the proportion has decreased significantly, but it is still one of the main factors affecting the SKF bearing failure. Appropriateness of the selection is still bearing failure analysis must take into consideration.