The rolling body of a cylindrical roller bearing is cylindrical, and it is a radial rolling bearing. The internal structure of the IKO cylindrical roller bearing adopts the 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, which effectively prevents the increase of the rotating torque.
The cylindrical roller and raceway of IKO cylindrical roller bearing are linear contact bearings. Load capacity, mainly bear radial load. The friction between the rolling element and the ring flange is small, which is suitable for high-speed rotation. Depending on whether the ferrule has ribs, it can be divided into single-row cylindrical roller bearings such as NU, NJ, NUP, N, NF, and double-row cylindrical roller bearings such as NNU, NN. The bearing has a separable inner and outer ring structure.
Cylindrical roller bearings with no ribs on the inner or outer ring, the inner and outer rings can move relatively in the axial direction, so they can be used as free-end bearings. Cylindrical roller bearings with double ribs on one side of the inner ring and outer ring and a single rib on the other side can withstand a certain degree of axial load in one direction. Steel stamped cages or copper alloy solid cages are generally used. However, some use polyamide molding cages.
Product features and characteristics of IKO cylindrical roller bearin
Cylindrical rollers are in linear contact with the raceways and have a large radial load capacity. It is suitable for both heavy and shock loads and high-speed rotation. Cylindrical roller bearing raceways and rolling bodies are geometrically shaped. After improved design, it has a higher load carrying capacity. The new structural design of the flange and roller end faces not only improves the axial bearing capacity of the bearing, but also improves the lubrication conditions of the contact area between the roller end face and the flange. Bearing performance.
Features of IKO cylindrical roller bearin
1. Roller and raceway are in line contact or repaired line contact, with large radial bearing capacity, suitable for bearing heavy load and impact load.
2. The friction coefficient is small, suitable for high speed, and the limiting speed is close to deep groove ball bearings.
3. N type and NU type can move axially, can adapt to the change of the relative position of the shaft and the housing caused by thermal expansion or installation error, and can be used as free end support.
4. The processing requirements for the shaft or seat hole are relatively high. The relative deflection of the outer ring axis after the bearing is installed must be strictly controlled to avoid contact stress concentration.
5. The inner or outer ring can be separated for easy installation and removal
IKO cylindrical roller bearin categories
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 at high speeds. 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.
Cylindrical roller bearings can be divided into single-row, double-row, and multi-row cylindrical roller bearings according to the number of rows of mounted rolling elements. Different structural bearings are also shown in the design of the position of the ribs. The commonly used cylindrical roller bearings have the following forms:
1.
N, NU type
N-type bearings have no ribs on the outer ring and ribs on both sides of the inner ring. Displacement between the shaft and the bearing housing in both axial directions can be allowed. NU type bearings have ribs on both sides of the outer ring and no ribs on the inner ring. It is also possible to allow displacement of the shaft relative to the bearing housing in both axial directions. Therefore, this type of structure is suitable for use as a moving end bearing.
NJ, NF type
NJ bearings have ribs on both sides of the outer ring and ribs on one side of the inner ring. Can withstand a certain amount of unidirectional axial load. The outer ring of the NF type has ribs on one side and the inner ring has ribs on both sides. Can also bear a certain amount of unidirectional axial load. Therefore, this type of structure is suitable for unidirectional axial positioning bearings.
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 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.
NH (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.
2.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:
NN, 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.
NNF 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.
3.Four-row bearings
Four-row cylindrical roller bearings are mainly used in cold rolling, hot rolling mills, billet rolling mills and other rolling mill machinery. The bearings have a separate structure. The bearing rings and rolling element components can be easily separated. Therefore, the bearing cleaning, inspection or Installation and disassembly are very convenient.
FC type
The FC bearing is composed of two outer rings and one inner ring. Each side of the outer ring has a rib on the two sides and a middle rib on the middle.
FCD type
FCD bearings are actually a combination of two NN bearings.
FC type and FCD type bearings can allow axial displacement between the shaft and the bearing housing in two directions. Therefore, this type of structure is suitable as a movable end bearing.
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