Product Description

Cylindrical Roller Bearings

Cylindrical roller bearings are separable, easy to mount and dismount especially more outstanding when they are used on bearings requiring interference fit between inner and outer rings with the shaft and housing. Cylindrical roller bearing is contacted with the fair line between the rollers and the raceway, which is of elimination of edge stress. Comparing with the Ball Bearings, with same boundary dimensions, cylindrical roller bearings have larger radial carrying capacity. Comparing with structure, this type of bearing is more suitable for high speed rotation.

Structures

1. N0000 type cylindrical roller bearings without rib on outer ring and NU0000 type cylindrical roller bearings without rib on inner ring

These type of bearings can carry large radial load, rotate at a high speed, there is no limit to axial displacement on shaft or housing, but cannot withstand axial load.

2. NJ0000 and NF0000 types Cylindrical roller bearings with ribs on both of inner rings and outer rings

NJ0000 and NF0000 Types of Bearings can allow axial displacement on the shaft or housing and carry little single-direction axial load; NU0000+HJ0000 types and NUP0000 type bearings can allow two-direction displacement within axial clearance range on the shaft and housing and carry little double-direction axial load.

3. RNU0000 Type Cylindrical roller bearings without inner rings.

RNU0000 types of bearing are applicable to the parts with limitation on radial size. The shaft surface can be directly used as raceway surface, the hardness, processing precision and surface roughness should be similar to those of ring raceway.

4.NAL0000 type and NNAL0000 type of long cylindrical roller bearings with double ribs on outer rings are applicable to petroleum machinery.

5. Four-Row cylindrical roller bearings FC,FCD and FCDP types are mainly applicable to heavy-duty machines, such as rolling mills. These bearing designations are different from general rule.

Cage material

When the outer diameter is less than (inclusive)400mm, solid brass cage or steel sheet are adopted for single row Cylindrical Roller Bearing. When the outer diameter is more than400mm, brass cage and pin-type cage are adopted for four row cylindrical Roller bearing.

Permissible tilt angle

Generally the cylindrical Roller Bearing shaft is not allowed to be tilted relative to the housing; while for Single-Row cylindrical roller bearings, when under light load, a relative2`tilt angle is allowed between the inner ring axial line and outer axial line. If the load is larger, the allowable error can be a little more, but should not exceed4`.

Tolerance and clearance

In accordance with requirement, Single row cylindrical roller bearings can be different tolerance classes. The tolerance value can be finding in the section Rolling Bearing Tolerance. For four row cylindrical roller bearings, the tolerance is normally P0, P6 and P5.

The Radial clearance of cylindrical roller bearing is as attached table 1.

Load-carrying capacity

The load-carrying capacity of cylindrical roller bearings with ribs on inner rings and outer rings are related to the magnitude of the radial load and lubrication methods. The maximum allowable axial load is as following:

Oil lubrication

Grease lubrication

Fap<0.4F_r

Fap-(N);Maximum allowable axial load

K-Factors related to bearing size series

2.3 series K=0.2;

22.23 series K=0.16.

C_0r-(N);Basic static load rating

ng-F_r>0.1C_r,

(r/min);For the limit rotational speed of a bearing carrying a purely radial load, when F_r>0.1C_r, use the speed reduction factor to compensate the limit rotational speed.

n-(r/min).Actual operating rotation speed

As the axial load given by the above formula and under the following conditions, bearing with tolerance class 0 (except improved and enhanced types) can function normally:

The temperature of oil lubricate is55℃and grease lubricate is40℃, the highest is90℃. (The viscosity of lubricate oil is ν50=30mm²/s, and the dropping point of lubricate grease is170℃.)

If the axial load is acted internally, the allowable axial load can be doubled; when acted temporally, the allowable load can be increased by 2 times.

Dynamic equivalent radial load

P_r=F_r

For the cylindrical roller bearing with axial load

2.3

To 2 and 3 series

P_r=F_r+0.3F_a (0≤F_a/F_r≤0.12)

P_r=0.94F_r+0.8F_a (0.12≤F_a/F_r≤0.3)

22.23

To 22,23 series

P_r=F_r+0.2F_a (0≤F_a/F_r≤0.18)

P_r=0.94F_r+0.53F_a (0.18≤F_a/F_r≤0.3)

Static equivalent radial load

P_0r=F_r

Table 1 Radial clearance of cylindrical roller bearing with cylindrical bore

μm

Nominal bore diameter d mm		C2 clearance		Standard clearance		C3 clearance		C4 clearance		C5 clearance
Over	To	Min	Max	Min	Max	Over	To	Min	Max	Min	Max
10 24 30 40 50 65 80 100 120 140 160 180 200 225 250 280 315 355 400 450	10 24 30 40 50 65 80 100 120 140 160 180 200 225 250 280 315 355 400 450 500	0 0 0 5 5 10 10 15 15 15 20 25 35 45 45 55 55 65 100 110 110	25 25 25 30 35 40 45 50 55 60 70 75 90 105 110 125 130 145 190 210 220	20 20 20 25 30 40 40 50 50 60 70 75 90 105 110 125 130 145 190 210 220	45 45 45 50 60 70 75 85 90 105 120 125 145 165 175 195 205 225 280 310 330	35 35 35 45 50 60 65 75 85 100 115 120 140 160 170 190 200 225 280 310 330	60 60 60 70 80 90 100 110 125 145 165 170 195 220 235 260 275 305 370 410 440	50 50 50 60 70 80 90 105 125 145 165 170 195 220 235 260 275 305 370 410 440	75 75 75 85 100 110 125 140 165 190 215 220 250 280 300 330 350 385 460 510 550	- 65 70 80 95 110 130 155 180 200 225 250 275 305 330 370 410 455 510 565 625	- 90 95 105 125 140 165 190 220 245 275 300 330 365 395 440 485 535 600 665 735

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