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Classification and application of cylindrical roller bearings

wallpapers Industry 2020-03-24

Cylindrical roller bearings are radial rolling bearings of cylindrical rollers. The internal structure of cylindrical roller bearings uses rollers arranged in parallel. Spacers or spacers are installed between the rollers, which can prevent the tilting of the rollers or friction between the rollers, and effectively prevent the increase of rotational torque.

First, the classification of cylindrical roller bearings

1. Structure type

Outer ring without rib N0000 and inner ring without rib NU0000. Cylindrical roller bearings. These bearings can accept large radial loads, high limit speeds, do not restrict axial displacement of the shaft or housing, and cannot accept axial Load.

NJ0000 and NF0000 cylindrical roller bearings with ribs on the inner and outer rings can restrain axial displacement of the shaft or housing in one direction, and can accept small unidirectional axial loads. NU0000 + HJ0000. NJ0000 + HJ0000 and NUP0000 bearings can restrain axial displacement of the shaft or housing in the axial clearance field of imported bearings, and can accept small bidirectional axial loads.

2.Bearing category

Cylindrical roller bearings are separate bearings and are easy to install and remove. Cylindrical roller bearings can withstand large radial loads and are suitable for use in high-speed operation.

This type of bearing allows the angular error (inclination) between the axis of the inner ring and the axis of the outer ring to be small, only 2 ′ to 4 ′. Therefore, the machining accuracy of the shaft and the bearing seat is relatively high. Otherwise, uneven load or stress concentration is likely to occur at the contact portion of the raceway. However, correcting the roller or raceway contact busbar can reduce the occurrence of stress concentration.

First, the classification of cylindrical roller bearings

1. Structure type

Outer ring without rib N0000 and inner ring without rib NU0000. Cylindrical roller bearings. These bearings can accept large radial loads, high limit speeds, do not restrict axial displacement of the shaft or housing, and cannot accept axial Load.

NJ0000 and NF0000 cylindrical roller bearings with ribs on the inner and outer rings can restrain axial displacement of the shaft or housing in one direction, and can accept small unidirectional axial loads. NU0000 + HJ0000. NJ0000 + HJ0000 and NUP0000 bearings can restrain axial displacement of the shaft or housing in the axial clearance field of imported bearings, and can accept small bidirectional axial loads.

2.Bearing category

Cylindrical roller bearings are separate bearings and are easy to install and remove. Cylindrical roller bearings can withstand large radial loads and are suitable for use in high-speed operation.

This type of bearing allows the angular error (inclination) between the axis of the inner ring and the axis of the outer ring to be small, only 2 ′ to 4 ′. Therefore, the machining accuracy of the shaft and the bearing seat is relatively high. Otherwise, uneven load or stress concentration is likely to occur at the contact portion of the raceway. However, correcting the roller or raceway contact busbar can reduce the occurrence of stress concentration.

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 retaining ring on the other side. Can withstand a certain amount of bidirectional axial load.

The NFP type bearing has a (fixed) single rib on the outer ring side, and a separable flat retaining ring on the other side, and ribs on both sides of the inner ring. Can also bear a certain amount of bidirectional axial load. This type of structural bearing can limit the displacement of the shaft relative to the bearing seat in two axial directions. Therefore, it is suitable for use as a fixed-end bearing.

④NH (NJ + HJ) type

NH-type bearing is a combination of NJ-type bearing and HJ-type inclined 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 entire inner ring width of the NJ type bearing to maintain a closer fit with the shaft. And NH type bearings are more convenient to install and disassemble.

The NH type bearing can limit the displacement of the shaft relative to the bearing seat in two axial directions. Therefore, it is suitable for use as a fixed-end bearing.

4.Double-row bearings

Double-row cylindrical roller bearings have two kinds of structures: cylindrical inner hole and conical inner hole (bearing post code plus K). This type of bearing has the advantages of compact structure, high rigidity, large bearing capacity, and small deformation after load. It is especially suitable for machine tool spindle support. The conical inner hole can also play a role of adjusting the clearance in a small amount, and can simplify the structure of the positioning device and facilitate the installation and removal. Commonly used double-row cylindrical roller bearings have the following forms:

①NN, NNU type

NN type bearings have no ribs on the outer ring, and there are ribs on both sides of the inner ring and a middle rib on the middle. It can allow two directions of displacement between the shaft and the bearing seat in the axial direction.

NNU 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 two directions of displacement between the shaft and the bearing seat in the axial direction. Therefore, this type of structure is suitable as a movable end bearing. The cages of this type of bearings are mostly made of car-made solid cages.

②NNF type

NNF type bearings are double row full complement cylindrical roller bearings. The bearing consists of an outer ring with a middle rib and two inner rings with a double rib. The rollers are guided by the ribs of the inner ring, and the two inner rings are fixed together by a fastening ring. In addition to bearing large radial and axial loads, this structure can also bear overturning moments, so it is often used as a fixed-end bearing.

NNF bearings adopt contact seals on both sides. The bearing is filled with grease. The working temperature of the grease is -50 ° C to + 110 ° C. However, due to the limitation of the sealing material, the working temperature of the bearing is limited to -40 ° C to + 80 ° C. Under good working conditions, NNF bearings with seals do not need to be maintained. If the bearings are exposed to water vapor or polluted the environment for a long time, and they are running at medium or high speed, they can be adjusted through the oil grooves and holes on the outer ring The bearings are relubricated.


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