cylindrical roller bearing
1. Single row cylindrical roller bearing
Single row cylindrical roller bearings are divided into N type with no ribs on the outer ring and double ribs on the inner ring and NU type structure with no ribs on the inner ring and double ribs on the outer ring according to the rib structure of the ring. Type or NU type bearings can allow bidirectional displacement of the shaft relative to the bearing box within a certain range, and are mostly used as non-locating bearings. NJ type is characterized by double ribs on the outer ring and single rib on the inner ring, NF type is double ribs on the inner ring and single rib on the outer ring, NJ and NF are characterized by allowing the shaft to move in one direction Axial displacement occurs. According to different application occasions, NU type and NJ type can also be used in combination with HJ type oblique retaining ring.
2. Double row cylindrical roller bearing
Double-row cylindrical roller bearings have two structures: cylindrical inner hole and conical inner hole. This type of bearing has the advantages of compact structure, high rigidity, large load-bearing capacity, and small deformation after loading. It is especially suitable for the support of machine tool spindles. NN type bearings The structural feature is that the inner ring has ribs on both sides and the outer ring has no ribs, while the NU type bearing has ribs on both sides of the outer ring and the inner ring has no ribs. These two types of bearings do not limit the distance between the shaft and the housing. Relative axial displacement, used as a non-locating bearing.
3. Four row cylindrical roller bearing
It is used in heavy machinery such as cold and hot rolling mills and embryo openers. The bearings are separated, and the bearing ring and rolling element components can be easily separated. The cleaning, inspection and disassembly of the bearings are very convenient. Bearings suffixed with E are reinforced cylindrical roller bearings that have been optimized in recent years. They have higher load capacity and should be preferred. Cylindrical roller bearings generally do not allow the shaft to tilt relative to the housing. However, for single row cylindrical roller bearings, under light load conditions, the inner and outer rings are allowed to incline with each other, and under heavy load conditions, the allowable error can be slightly larger, but not more than 4. In addition, Longma also produces cylindrical roller bearings without cages, and bearings with various deformation structures based on the above-mentioned structural types.
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