Skirts & Dresses

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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<0.4Fr 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. C0r-(N);Basic static load rating ng-Fr>0.1Cr, (r/min);For the limit rotational speed of a bearing carrying       a purely radial load, when Fr>0.1Cr, 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           Pr=Fr For the cylindrical roller bearing with axial load 2.3 To 2 and 3 series           Pr=Fr+0.3Fa         (0≤Fa/Fr≤0.12)           Pr=0.94Fr+0.8Fa     (0.12≤Fa/Fr≤0.3) 22.23 To 22,23 series           Pr=Fr+0.2Fa         (0≤Fa/Fr≤0.18)           Pr=0.94Fr+0.53Fa    (0.18≤Fa/Fr≤0.3) Static equivalent radial load                P0r=Fr       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 http://www.nxzjck.com

Tags: Cylindrical Roller Bearing N1024M,Roller Bearing N1024M,Cylindrical Roller Bearing N1024M