Not all SKF bearings require the smallest working clearance, you must choose the appropriate clearance according to the conditions.
In national standard 4604-93, the radial clearance of rolling SKF bearings is divided into five groups -2 groups, 0 groups, 3 groups, 4 groups and 5 groups. The clearance values are in order from small to large, of which 0 group is the standard clearance.
The basic radial clearance group is suitable for general operating conditions, conventional temperatures and commonly used interference fits; SKF bearings that work under special conditions such as high temperature, high speed, low noise, and low friction should use large radial clearance; For precision spindles, SKF bearings for machine tool spindles, a small radial clearance should be used; for roller SKF bearings, a small amount of working clearance can be maintained.
In addition, there is no so-called clearance for separated SKF bearings; finally, the working clearance of imported SKF bearings after installation is smaller than the original clearance before installation, because SKF bearings must withstand a certain load of rotation, and SKF bearings cooperate And the amount of elastic deformation caused by the load.
SKF bearings can be divided into sliding SKF bearings and rolling SKF bearings according to the specific structure and the similarities and differences of working properties. As the name suggests, the sliding SKF bearing is a flat SKF bearing with a larger contact area, so the degree of wear will be larger, that is, the friction coefficient is larger. Therefore, sliding SKF bearings require special materials, and anti-friction is its biggest feature.
The characteristics of rolling SKF bearings are different from sliding. It converts the sliding friction between the shaft seat and the shaft into rolling friction, which will reduce the loss. Then use the inner and outer ring, rolling body, cage interaction to complete the work.
Whether it is a rolling SKF bearing or a sliding SKF imported bearing, although their working principles are different, their functions are the same, both to reduce the mechanical load friction coefficient generated during mechanical power transmission and to support the rotating body of the machine.
SKF bearings are a kind of precision components, which are widely used in various fields. They are divided into many types according to structure or type. The most common types are friction bearings and sliding shafts. However, there is a difference between the two. Obviously, rolling bearings have less frictional resistance than sliding bearings, and they start quickly and efficiently. This is the biggest advantage of rolling bearings compared with sliding bearings. However, it also has disadvantages. It is large in size and therefore weak in shock absorption. It has a short life when running at high speeds, and it also emits large abnormal sounds after long-term use.
The most essential difference between SKF rolling bearings and sliding bearings is that rolling bearings are surface contacts, while sliding bearings are point contacts. Rolling bearings have a large contact surface, simple structure, easy operation and easy disassembly; sliding bearings have high requirements for lubrication.
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