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The common methods to distinguish the quality of rolling bearing: packaging is clear: in general, are factory brand has its own specialized design personnel external packaging design, and arrange for clearance of the plant production conditions of production, so the packaging from the line to the blocks of color are very clear, unambiguous, part of the brand of accessories and special packaging with a unique design in order to protect their intellectual property rights.
Seal the words are clear: in the rolling bearing body brand name will be printed on the words, label etc.. Font is very small, but it is mostly used plants Chupin stamping technology, but without the heat-treatment is carried out before the embossing, so the font is small, but the concave too deep, very clear. The font counterfeit products not only fuzzy, due to rough printing techniques, fonts, floating on the surface, and some even can be easily wiped off by hand.
If there is a noise: the left hand holding the body bearing sleeve, right hand toggle coat make its rotation, listen to whether there are miscellaneous ring. Because of the current anti rust technology is not the special home, so the bearing body for rust prevention processing is easy to leave a thick layer of oil stain, get in the hands of sticky stiff, and bearing the original foreign almost can not see the traces of rust preventive oil, pour is particularly careful experts said bearing smells a taste, certainly the antirust oil, just impossible to see. Chamfering is uniform: the so-called bearing chamfer, also is the horizontal and the vertical surface junction, counterfeit bearings due to the constraints of production technology, processing is unsatisfactory in these corners of the site.
1, bearing radial load Bearing mainly bear radial load is a centripetal bearing.
Nominal contact the bearing angle a0<=45 0.
Nominal contact the bearing angle a0<=45 0.
Radial load scale rain the same roller bearings than ball bearings can bear larger. N type and NU type cylindrical roller bearings can bear radial load, radial bearing other types can bear radial load, also can withstand the axial load. 2, the axial load bearing
Main bearing under axial load for the general thrust bearing, the nominal contact corner a0>450.
Main bearing under axial load for the general thrust bearing, the nominal contact corner a0>450.
The axial thrust bearing and thrust angular contact ball bearings according to the different structure and can bear one or two directions. When subjected to stress is very high and is thrust cylindrical roller bearings and spherical roller thrust bearings. Spherical roller thrust bearing and a one-way thrust angular contact ball bearings can bear the axial load and radial load, thrust bearings can only bear the axial load other.
3, bearing its own length compensation
3, bearing its own length compensation
Structure supporting a shaft and bearing is usually used in combination of fixed bearing and sliding bearing. Walk the length of the shaft bearing the compensation error and thermal expansion.
NU type and N type cylindrical roller bearing is traveling bearing ideal, these bearings can compensate the length. Inner and outer rings of the bearing can be tightly matched.
4, the sliding fit length compensation
Non separable bearings (such as deep groove ball bearings and roller bearings) can also be used as a floating bearing. One of these two rings bearing used in the axial coordination, no fixed surface. Therefore, a bearing rings can be active in its supporting surface.
5, separable bearing (precision)
This is a ring can be separated from the rolling bearing is installed, when the two rings are tightly matched its advantages.
Double row bearings including four point contact ball bearing, double half inner ring angular contact ball bearings, cylindrical roller bearings, tapered roller bearings, thrust ball bearings, thrust cylindrical roller bearings and spherical roller thrust bearings.