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Common methods for identifying the quality of rolling bearings: Is the outer packaging clear: Under normal circumstances, the brand has its own dedicated designers to design the outer packaging, and arrange for production in factories that pass the production conditions, so the packaging is from lines to color blocks They are all very clear and unambiguous. Some brands of accessories have unique designs on their packaging to protect their intellectual property rights.
Whether the stamping is clear: the brand name, label, etc. will be printed on the rolling bearing body. The font is very small, but most of the products produced by the factory use stencil printing technology, and the characters are pressed before heat treatment. Therefore, although the font is small, it is deep concave and very clear. The fonts of counterfeit products are not only blurred, because of the rough printing technology, the fonts float on the surface, and some of them can even be easily erased by hand.
Whether there is noise: Hold the inner sleeve of the bearing with your left hand, and turn the sleeve with your right hand to listen to whether there is any noise. Due to the backward production conditions of most counterfeit products and the completely hand-crafted workshop operation, it is inevitable that impurities such as sand will be mixed in the production process, which is hidden in the bearing body, so it will make noises when rotating. This is the biggest difference from a genuine brand that strictly enforces production standards and operates with machines.
Whether there are turbid oil stains on the surface: This should be paid special attention to when purchasing bearings. Since the current domestic anti-rust technology is not very popular, it is easy to leave thick oil stains when anti-rust treatment is performed on the bearing body, which is sticky and sticky in the hand, while it is almost invisible on the original foreign bearings. The traces of anti-rust oil, however, are particularly careful experts say that the bearing smells a certain kind of smell, it must be the anti-rust oil, but you can't see it.
Whether the chamfer is uniform: The so-called chamfer of the bearing is the junction of the horizontal and vertical planes. Due to the limitation of production technology, the counterfeit bearings are not handled satisfactorily at these corners.
1. Radial bearing load
The bearing that mainly bears the radial load is a radial bearing. The nominal contact angle of this type of bearing a0<=45 0. Roller bearings with the same gauge rain can withstand greater radial loads than ball bearings.
N-type and NU-type cylindrical roller bearings can only bear radial loads, while other types of radial bearings can bear both radial loads and axial loads.
2. The axial load of the bearing
The bearing that mainly bears the axial load is generally a thrust bearing, and its nominal contact corner a0>450. Thrust bearings and thrust angular contact ball bearings can bear axial force in one or two directions at the same time depending on the structure. When the bearing force is particularly high, thrust cylindrical roller bearings and thrust spherical roller bearings are preferred.
Thrust spherical roller bearings and unidirectional thrust angular contact ball bearings can bear axial load and radial load at the same time, while other thrust bearings can only bear axial load.
3. The length compensation of the bearing itself
Supporting a shaft and rolling bearings usually adopt a combination of fixed bearings and floating bearings. The floating bearing compensates for shaft length errors and thermal expansion.
NU-type and N-type cylindrical roller bearings are ideal floating bearings, and these bearings themselves can compensate for length. The inner and outer rings of the bearing can be tightly fitted.
4. Length compensation of sliding fit
Non-separable bearings (such as deep groove ball bearings and spherical roller bearings) can also be used as floating bearings. One of the two rings of this type of bearing is fitted with no axial fixing surface. Therefore, a ring of the bearing can move on its supporting surface.
5. Separable bearing (precision)
This is a rolling bearing with rings that can be installed separately, and its advantages are very prominent when both rings are tightly fitted.
Separable bearings include four-point contact ball bearings, double-row angular contact ball bearings with double half inner rings, cylindrical roller bearings, tapered roller bearings, thrust ball bearings, thrust cylindrical roller bearings and thrust spherical roller bearings.