Cylindrical Roller Bearing

Four Row Cylindrical Roller Bearings

Cylindrical roller bearings, also known as a rolling bearing, carry a load by placing rolling elements (such as balls or rollers) between two bearing rings called races. The cylindrical roller bearings have a high radial load capacity and are suitable for high speeds. They vary according to the number of rows of rollers (usually one, two, or four) and if there’s a cage or not. No cage allows for the bearing to have more rows, which helps support even heavier radial loads.
Cylindrical roller bearings are used in a variety of applications. Examples include mining, petroleum production, power generation, transmission, cement processing, aggregate crushing, and metal recycling. Some cylindrical roller bearings are used in briquetting machines, rubber mixing equipment, rolling mills, rotary dryers, or pulp and paper machinery. Others are used in construction equipment, crushers, electric motors, blowers and fans, machine tools, traction motors and pumps.
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Four Row Cylindrical Roller Bearings

Four-row cylindrical roller bearings have conical inner and outer ring raceways with tapered rollers. The projection lines of all the conical surfaces meet at the same point of the bearing axis. This design makes tapered roller bearings suitable for bearing composite (radial and axial) loads. The contact Angle α primarily determines the axial load capacity of the bearing. The larger the alpha Angle, the higher the axial load capacity. Four-row cylindrical roller bearings with slight friction between the rolling body and the ring edge, suitable for high-speed rotation. According to the ring with or without flange, four-row cylindrical roller bearings can be divided into NU, NJ, NUP, N, NF, and other single-row bearings, NNU, NN, and other double row bearings.

The four-row cylindrical roller bearings structure with separable inner and outer rings. The cylindrical roller bearings with inner or outer rings without flanges can be used as free-end bearings because the inner and outer rings can move relative to each other in the axial direction. Two sides of the inner and outer rings are provided with double flaps. The crew on the other side is equipped with a cylindrical roller bearing with a single flap, which can withstand a certain degree of axial load in one direction. Four-row cylindrical roller bearings are usually of the disjointed type. A tapered inner ring assembly consisting of an inner ring of the roller and cage assembly may be mounted separately from the outer taper ring (outer ring). Generally, steel plate stamping cages or copper alloy car cages are used.

Four-row cylindrical roller bearings are available in several designs:

  • With a cylindrical or tapered bore
  • Open or sealed

Four Row Cylindrical Roller Bearings Specification:

Dimensions(mm) Basic Load Ratings(kN) Bearing No. Mass(kg)
d D B r r1 Cr C0r
min min
140 210 185 2.5 2 1095 2740 382028 24.1
150 210 165 2.5 2 945 2560 382930 21.2
170 260 230 3 2.5 1655 4160 382034 39.5
200 310 275 3 2.5 2320 5880 382040 75.1
220 340 305 4 3 2770 7165 382044 98
240 360 310 4 3 2925 7870 382048 91
260 360 265 3 2.5 2415 7100 382952 76.3
260 400 345 5 4 3620 9565 382052 153
280 460 324 5 4 4150 9900 381156 200
300 420 300 4 3 3175 9305 382960 130
300 460 390 5 4 4615 12465 382060 219
300 500 370 5 4 5065 12175 381160 285
320 480 390 5 4 4760 13195 382064 234
340 460 310 4 3 3455 10780 382968 145
340 520 325 5 4 4565 11760 381068 234
340 580 425 5 4 6670 15980 381168 441
360 540 325 5 4 4690 12370 381072 248
380 560 325 5 4 4810 12985 381076 281
380 620 420 5 4 6980 17370 381176 487
400 600 356 5 4 5635 15060 381080 317
420 620 356 5 4 5770 15725 381084 358
420 700 480 6 5 8895 22110 381184 760
440 650 376 6 5 6335 17405 381088 401
460 620 310 4 3 4740 14570 381992 173
460 680 410 6 5 7115 19845 381092 476
480 650 338 5 4 5365 16600 381996 301
480 700 420 6 5 7400 21120 381096 547
500 720 420 6 5 7550 21910 3810/500 565
530 780 450 6 5 8835 25060 3810/530 744
530 870 590 7.5 6 13115 34105 3811/530 1422
560 750 368 5 4 6595 21015 3819/560 456
560 920 620 7.5 6 14475 37880 3811/560 1635
600 800 380 5 4 7205 23215 3819/600 536
600 870 480 5 5 10325 30115 3810/600 995
600 980 650 7.5 6 16035 42465 3811/600 1970
630 850 418 6 5 8405 26915 3819/630 720
630 920 515 7.5 6 11645 34005 3810/630 1158
630 1030 670 7.5 6 17325 45975 3811/630 2202
670 900 412 6 5 8790 28175 3819/670 959
670 1090 710 7.5 6 19215 51720 3811/670 2665
710 1030 555 7.5 6 13860 41215 3810/710 1568
710 1150 750 9.5 9.5 21195 57810 3811/710 3227
750 1090 605 7.5 6 15775 47485 3810/750 1874
750 1220 840 9.5 9.5 24715 68495 3811/750 3994
950 1360 880 7.5 6 26435 87060 3820/950 4087
1060 1500 1000 9.5 9.5 32090 109975 3820/1060 5896

Features of Four Row Cylindrical Roller Bearings:

  • Exceptional high load carrying capacity
    Because of their high number of rollers, four-row cylindrical roller bearings are suitable for hefty radial loads.
  • Low friction (Roller end/flange contact area)
    The open flange design and the roller end design and surface finish promote lubricant film formation, resulting in lower friction.
  • Long service life
    The logarithmic roller profile reduces edge stresses at the roller/raceway contact and sensitivity to misalignment and shaft deflection.
  • Enhanced operational reliability
    The surface finish on the contact surfaces of the rollers and raceways supports the formation of a hydrodynamic lubricant film.
  • Separable and interchangeable
    The separable components of four-row cylindrical roller bearings are interchangeable. This facilitates mounting and dismounting, as well as maintenance inspections.
  • High-speed capability
    The cage designs suit high speeds, rapid accelerations, and peak loads.
  • Low cross-sectional height
    The low cross-sectional height of four-row cylindrical roller bearings allows for relatively large roll neck diameters compared to the roll diameter.

Four Row Cylindrical Roller Bearings Application Fields:

Four-row cylindrical roller bearings are widely used in automobiles, rolling mills, mining, metallurgy, plastic machinery, and other industries.