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.