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Cylindrical roller bearings category introduction

wallpapers Low Carbon 2020-08-27
Cylindrical roller bearings can be divided into single row, double row and multiple row cylindrical roller bearings according to the number of rows of rolling elements. Bearings of different structures are also shown in the design of the rib position. The commonly used cylindrical roller bearings have the following forms:
 
Single-row cylindrical roller bearings: Single-row cylindrical roller bearings are separable bearings, which are easy to install and disassemble. Both rings can be tightly fitted. The contact line between the roller and the raceway can be modified to reduce stress concentration.
Double-row cylindrical roller bearings: Double-row cylindrical roller bearings are floating bearings, and their separability makes installation and disassembly easy. Both ferrules can be tightly fitted. The double row cylindrical roller bearing almost does not allow inclination angle.
Single row bearing
Single row cylindrical roller bearings
Single row cylindrical roller bearings
N, NU type
N-type bearings have no ribs on the outer ring, and ribs on both sides of the inner ring. It can allow the displacement of the shaft relative to the bearing seat in both axial directions. The NU type bearing has ribs on both sides of the outer ring and no ribs on the inner ring. It can also allow displacement of the shaft relative to the bearing seat in both axial directions. Therefore, this type of structure is suitable for use as a floating end bearing.
NJ, NF type
NJ type bearings have ribs on both sides of the outer ring, and ribs on one side of the inner ring. Can bear a certain amount of unidirectional axial load. The NF type has ribs on one side of the outer ring and ribs on both sides of the inner ring. It can also bear a certain amount of unidirectional axial load. Therefore, this type of structure is suitable for use as a unidirectional axial positioning bearing.
NUP, NFP type
NUP type bearings have ribs on both sides of the outer ring, a (fixed) single rib on one side of the inner ring, and a separable flat ring on the other side. It can bear a certain amount of bidirectional axial load.
NFP type bearing has a (fixed) single rib on one side of the outer ring, and a separable flat ring on the other side, with ribs on both sides of the inner ring. It can also bear a certain amount of bidirectional axial load. This kind of structural bearing can limit the displacement of the shaft relative to the bearing seat in both axial directions. Therefore, it is suitable for use as a fixed end bearing.
NH (NJ+HJ) type
NH type bearing is a combination of NJ type bearing and HJ type oblique retaining ring. Because the inner ring of the NUP type bearing is short, and the flat retaining ring is not fixed, it is inconvenient to use, while the NH type bearing can use the width of the entire inner ring of the NJ type bearing to maintain a tighter fit with the shaft. And NH type bearing is more convenient to install and disassemble.
The NH type bearing can limit the displacement of the shaft relative to the bearing seat in both axial directions. Therefore, it is suitable for use as a fixed end bearing.
Double row bearings
Double row cylindrical roller bearings
Double row cylindrical roller bearings
Double row cylindrical roller bearings have two structures: cylindrical inner bore and conical inner bore (the bearing code is added K). This type of bearing has the advantages of compact structure, high rigidity, large carrying capacity, and small deformation after being loaded. It is especially suitable for machine tool spindle support. The conical inner hole can also play the role of micro-adjustment of the clearance, and can simplify the structure of the positioning device and facilitate installation and disassembly. Commonly used double row cylindrical roller bearings have the following forms:
NN, NNU type
The outer ring of the NN type bearing has no ribs, and the inner ring has ribs on both sides of the inner ring, and there is a middle rib in the middle. It can allow the shaft relative to the bearing seat to produce axial displacement in two directions.
NNU type bearings have ribs on both sides of the outer ring and middle ribs in the middle, and no ribs on the inner ring. It can allow the shaft relative to the bearing seat to produce axial displacement in two directions. Therefore, this type of structure is suitable as a floating end bearing. The cage of this type of bearing mostly adopts a car-made solid cage.
NNF type
NNF type bearings are double-row full complement cylindrical roller bearings. The bearing consists of an outer ring with a central rib and two inner rings with a double rib. The roller is guided by the rib of the inner ring, and the two inner rings are fixed together with a fastening ring. In addition to being able to withstand large radial loads and axial loads, this structure can also withstand overturning moments. Therefore, it is often used as a fixed end bearing.
NNF type bearing adopts contact seal on both sides. The bearing is filled with grease. The working temperature of the grease is -50°C to +110°C, but due to the limitation of the sealing material, the bearing's working temperature is limited to -40°C to +80°C. In the case of good working conditions, the sealed NNF bearing does not need to be maintained. If the bearing is exposed to water vapor or polluted environment for a long time and is running at medium or high speed, it can be adjusted through the lubricating oil groove and lubricating hole on the outer ring. The bearings are relubricated.
Four row bearings
Four row cylindrical roller bearings
Four row cylindrical roller bearings
Four-row cylindrical roller bearings are mainly used in rolling mill machinery such as cold and hot rolling mills and billeting mills. The bearings are of a separate structure, and the bearing rings and rolling element components can be easily separated. Therefore, the cleaning, inspection or Installation and disassembly are very convenient.
FC type
FC type bearings are composed of two outer rings and an inner ring. There are ribs on both sides of each outer ring and a middle rib in the middle, and the inner ring has no ribs.
FCD type
FCD type bearing is actually a combination of two NN type bearings.
FC type and FCD type bearings can allow the shaft relative to the bearing seat to produce axial displacement in two directions. Therefore, this type of structure is suitable as a floating end bearing. The cage of this type of bearing mostly adopts a car-made entity 13:58.

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