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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Types of cylindrical roller bearings Type of cylindrical roller bearing
Cylindrical roller bearings are attributed to separate bearings; equipment and disassembly are very convenient. Cylindrical roller bearings can accept large radial loads and are suitable for high speed applications. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
Such bearings allow the viewpoint error (inclination) of the inner ring axis and the outer ring axis to be very good. 2'~4'. Therefore, the machining accuracy of the shaft and the bearing housing is relatively high; Uniform load or stress gathering. However, the correction of the roller or raceway touch bus can reduce the onset of stress gathering.
Cylindrical roller bearings are different according to the number of rows of roll cages; they can be divided into single-row, double-row and multi-row cylindrical roller bearings, etc. Different layout bearings also show the orientation of the ribs. Cylindrical roller bearings are available in the following ways:
Single row cylindrical roller bearing
N, NU type
The outer ring of the N-type bearing has no ribs; the two sides of the inner ring have ribs. It can accommodate the displacement between the shaft and the bearing in the axial direction. The bearing of the NU type has ribs on both sides; the inner ring has no The rib can also allow the displacement of the shaft in the axial direction relative to the bearing housing. Therefore, this type of layout is suitable for use as a swimming end bearing.
NJ, NF type
NJ-type bearings have ribs on both sides of the outer ring; the inner ring has ribs on one side. It can accept a certain amount of unidirectional axial load. The NF type outer ring has ribs on one side; the inner ring has ribs on both sides. Accepts a certain amount of one-way axial load. Thus; this type of layout is suitable for use as a unidirectional axial positioning bearing.
NUP, NFP type
The NUP type bearing has a rib on both sides of the outer ring; the inner ring has a (fixed) single rib on one side; and the other side is a detachable flat ring. It can accept a certain amount of bidirectional axial load.
The NFP type bearing outer ring has a (fixed) single rib on one side; the other side is a detachable flat ring; the inner ring has ribs on both sides. It can also accept a certain amount of bidirectional axial load.
This type of layout bearing can constrain the displacement of the shaft in the axial direction relative to the bearing housing. Therefore, it is suitable for use as a fixed end bearing.
NH(NJ+HJ) type
The NH type bearing is the combination of the NJ type bearing and the HJ type slanting ring. Because the inner ring of the NUP type bearing is short; the flat ring is not fixed; the use is not convenient; and the NH type bearing can use the NJ type bearing. The width of the entire inner ring; a tighter cooperation with the shaft. And the NH-type bearing is more convenient in equipment and disassembly.
The NH type bearing can restrain the displacement of the shaft in the axial direction relative to the bearing housing. Therefore, it is suitable for use as a fixed end bearing.
Double row cylindrical roller bearing
Double row cylindrical roller bearings have two kinds of layouts: cylindrical inner hole and conical inner hole (bearing rear code plus K). This type of bearing has the advantages of compact layout, large rigidity, large bearing capacity and small deformation after load; Especially suitable for machine tool spindle support. The conical inner hole can also play the role of slightly adjusting the clearance; and it can simplify the layout of the positioning equipment;
Commonly used double row cylindrical roller bearings are as follows:
NN, NNU type
The outer ring of the NN bearing has no ribs; the center of the inner ring has a middle rib at the center of the rib. It can agree that the shaft is displaced in the axial direction with respect to the bearing housing.
The outer ring of the NNU bearing has a middle rib on both sides of the rib; the inner ring has no rib. It can permit the displacement of the shaft in the axial direction with respect to the bearing housing. Therefore, this layout is suitable for swimming. End bearing. This type of bearing retains more than the car body to adhere to the frame.
NNF type NNF bearing is a double row full complement cylindrical roller bearing; the bearing consists of a middle ring with a middle rib; two layouts with a double rib inner ring. The roller is guided by the rib of the inner ring; The rings are fastened together with a fastening ring. In addition to being able to accept large radial loads and axial loads, the layout is also capable of accepting overturning moments; thus; it is often used as a fixed end bearing.
NNF-type bearings use touch seals on both sides. The bearings are filled with smooth grease; the smooth grease has an operating temperature of -50 ° C to +110 ° C; but because of the sealing material; the operating temperature of the bearing is limited to -40 ° C to +80
Between °C. Under the condition of better working conditions; NNF bearing with sealing does not need to be protected; if the bearing is in water vapor or polluted environment for a long time; and it works for medium and high speed; it can pass the smooth oil groove on the outer ring And the lubrication hole makes up the bearing smooth.
Four-row cylindrical roller bearings Four-row cylindrical roller bearings are mainly used for rolling mill machinery such as cold and hot rolling mills and blanking machines; bearings are of separate layout; bearing rings and roll cage components can be conveniently separated; thus; It is convenient to remove, view or disassemble the bearing.
FC type
The FC type bearing consists of two outer rings and one inner ring; each of the outer rings has a middle rib at the center of the rib; the inner ring has no rib.
FCD type
The FCD bearing is actually a combination of two NN bearings.
FC type and FCD type bearings can support the displacement of the shaft in the axial direction relative to the bearing housing. Therefore, this type of layout is suitable for the bearing of the movable end. The bracket of this type of bearing is mostly made of the vehicle body 13: 58
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Type of cylindrical roller bearing
Source: Bearing network time: 2014-10-27