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ZKL, a.s.Jednovnická 8, BrnoCzech RepublicTelephone: +420 544 135 120E-mail: head@zkl.cz

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ZKL Bearings CZ, a.s.Líšeňská 45, BrnoCzech RepublicTelephone: +420 544 135 131E-mail: zkl@zkl.cz

SPECIFICATION AND APPLICATION OF SINGLE AND DOUBLE DIRECTION

THRUST BALL BEARINGS

Mining Industry

Mining operations are important to the improvement and preservation of our daily living, providing resources used to create electricity, roads, and communities. The equipment used is varied and can be operated con-tinuously, 24 hours a day for 7 days a week. The mining process starts with the breaking up of the rock face and continues through the pro-cessing of the minerals, utilizing such technology as cutting equipment, screening machinery, stockpiling equipment and conveying equipment.

The operating environments for bearings in the mining industries can be extremely severe. One or more of the following can arise:

•  heavy loads combined with shock loads

•  light loads with high speed rotation

•  heavy loads with low speed rotation

In recent years, the papermaking industry has been making great strides by enhancing the speed and the width of coverage of papermaking machines with the objective of boosting productivity. To reduce the amount of down-time caused by unexpected problems, customers demand high reliability from the bearings that are used in papermaking machines.

Papermaking Machinery

OthersThe application example of the axial bearings includes the location of the blade and piston axial pump shafts, where the thrust forces are significant and cannot be handled with other bearings with predominant function of radial force handling. The application includes the devices with vertical shafts holding the rotating drums, e.g. the centrifugal drums, or use movement screws in variol lifting devices. The application also includes axial bearings for the location in machining devices, e.g. car-ousel table location or lathe quill headstock. We can also mention the application for the suspending the crane hooks.

ZKL produces single direction thrust ball bearings in standardized series 511, 512, 513 and 514 and double direction thrust ball bearings in standardized series 522, 523 and 524, in sizes specified in the dimension tables.

The main dimensions comply with international dimension plan ISO 104.

ZKL also produces special thrust ball bearings, which differ from common standardized bearings in dimensions and design.

Single direction thrust ball bearingsSingle direction thrust ball bearings comprise of two flat rings where one side of the ring is commonly flat and the opposite side includes centric peripheral route for one line of balls with a cage. The com-position of 3 basic components (two rings and one cage with the balls) results in the bearing with the option of transferring the axial forces. The transferred axial force can only be applied to press both side flat rings to the balls in the ball route. The bearings are designed for transferring the axial forces applied in one axial direction, and cannot transfer radial forces. One of both flat rings is adjusted for assembly in the housing with accurate centring on the external diameter, the second flat ring has internal diameter adapted for centring which usually includes the location of the specific shaft which can freely pass further through the whole bearing. The ring is called shaft ring.

Double direction thrust ball bearingsDouble direction thrust ball bearings comprise of 5 basic com-ponents. They comprise of two sets of flat rings with the route and a cage with balls placed on both sides of the central flat ring with peripheral centric route for the ball lines on both fronts. The central ring, called shaft ring, includes construction larger than both edge rings with significantly smaller aperture than the side rings. The diameter reduction is enforced due to the requirement to receive sufficient area for the attachment ele-ments which define the solid position of the central ring on the shaft (thrust casing, mats, nuts, etc.).The bearings can transfer

axial load in both axial directions. Both side rings are adapted to the housing assembly identically to the single direction axial bearings, with accurate centring behind the external ring diameter. The character of variable force effects requires that the edge rings are attached in order to enable the axial pre-stressing providing the minimum required axial load of the bearing in transmission states, when force is at zero value.

Application of the thrust ball bearingsThe application example of the thrustbearings includes the location of the blade and piston axial pump shafts, where the thrust forces are significant and cannot be handled with other bearings with predomi-nant function of radial force handling. The application includes the devices with vertical shafts holding the rotating drums, e.g. the centrifugal drums, or use movement screws in various lifting devices. The application also includes axial bearings for the location in machining devices, e.g. carousel table loca-tion or lathe quill headstock. We can also mention the application for the suspending the crane hooks.

The specified examples cannot represent all options for utilizing the axial bearings depending on the specific individual locations.

Single direction axial ball bearings d = 10 to 240 mm

Main dimensions Basic load capacity Limitstress load

Limit frequency for greasing rotation

Bearing indication

Connecting dimen-sions

WeightCoefficient of minimum axial

loadDynamic Staticd D d1 D1 H rs Ca Coa Pu

Plastic lubricant

Oild da Da ra

~min min max max

mm kN kN min-1 mm kg110 190 187 113 63 2,0 280,00 744,0 27,61 890 1200 51322M 110 158 142 2,0 7,83 3,100130 225 220 134 75 2,1 358,00 1050,0 35,82 830 1100 51326M 130 186 168 2,0 12,94 6,000140 240 235 144 80 2,1 407,00 1250,0 41,22 790 1040 51328M 140 199 181 2,0 15,59 8,400150 215 212 153 49,9 1,5 235,60 733,3 24,67 970 1400 51230M 150 189 176 1,5 6,10 3,000150 250 245 154 80 2,1 419,00 1340,0 43,07 750 1000 51330M 150 209 191 2,0 16,23 9,400160 225 222 163 51 1,5 239,20 768,2 25,17 1040 1400 51232M 160 199 186 1,5 6,49 3,300170 240 237 173 55 1,5 283,20 929,6 29,51 920 1200 51234M 170 212 198 1,5 8,03 4,600180 250 245 183 56 1,5 302,60 1031,6 31,98 920 1200 51236M 180 220 208 1,5 8,51 5,500190 270 265 194 62 2,0 334,00 1170,0 35,07 830 1100 51238M 190 236 222 2,0 11,60 7,300200 280 275 204 62 2,0 339,00 1220,0 35,80 830 1100 51240M 200 246 232 2,0 12,11 8,000240 340 335 244 78 2,1 460,8 2000,0 53,4 600 800 51248M 299 281 2,0 23,0 23,000260 320 317 263 45 1,5 271,6 1120,0 29,9 800 1100 51152M 296 284 1,5 8,10 6,800260 360 355 264 79 2,1 470,5 2160,0 55,8 560 750 51252M 319 301 2,0 25,0 26,000280 350 347 283 53 1,5 312,3 1460,0 37,4 700 950 51156M 322 308 1,5 12,0 12,000280 380 375 284 80 2,1 483,1 2320,0 58,1 560 750 51256M 339 321 2,0 26,5 30,000300 380 376 304 62 2,0 358,9 1770,0 43,6 630 850 51160M 348 332 2,0 17,5 17,000300 420 415 304 95 3,0 589,8 3010,0 72,1 480 630 51260M 371 349 2,5 42,0 49,000320 400 396 324 63 2,0 363,8 1860,0 44,6 600 800 51164M 368 352 2,0 19,0 20,000320 440 435 325 95 3,0 577,2 3010,0 70,2 450 600 51264M 391 369 2,5 45,5 49,000340 420 416 344 64 2,0 368,6 1990,0 46,4 600 800 51168M 388 372 2,0 20,5 22,000340 460 456 345 96 3,0 606,3 3280,0 74,5 450 600 51268M 411 389 2,5 48,5 54,000360 440 436 364 65 2,0 378,3 2080,0 47,3 560 750 51172M 408 392 2,0 22,0 27,000360 500 495 365 110 4,0 727,5 4200,0 92,1 400 530 51272M 443 417 3,0 70,0 93,000380 460 456 384 65 2,0 383,2 2200,0 48,8 550 740 51176M 428 412 2,0 23,0 29,000380 520 515 385 112 4,0 704,2 4120,0 88,3 380 500 51276M 463 437 3,0 73,0 93,000400 480 476 404 65 2,0 410,0 2300,0 49,8 530 700 51180M** 448 432 2,0 24,0 30,000420 500 496 424 65 2,0 412,0 2410,0 51,1 510 680 51184M** 468 452 2,0 25,5 33,000440 540 536 444 80 2,1 525,0 3200,0 65,7 450 600 51188M** 499 481 2,0 42,0 59,000460 560 556 464 80 2,1 530,0 3230,0 65,0 440 580 51192M** 519 501 2,0 43,5 60,000480 580 576 484 80 2,1 540,0 3290,0 65,0 430 560 51196M** 539 521 2,0 45,5 68,000500 600 596 504 80 2,1 560,0 3370,0 65,3 420 550 511/500M** 559 541 2,0 46,5 70,000530 640 636 534 85 3,0 645,0 4380,0 82,3 400 530 511/530M** 595 575 2,5 58,5 105,000560 670 666 564 85 3,0 665,0 4660,0 85,4 380 500 511/560M** 625 606 2,5 61,0 116,000600 710 706 604 85 3,0 663,0 4800,0 85,3 370 490 511/600M** 665 645 2,5 65,0 124,000630 750 746 634 95 3,0 730,0 5430,0 94,0 340 450 511/630M** 701 679 2,5 84,0 158,000670 800 795 675 105 4,0 850,0 6680,0 112,0 300 400 511/670M** 747 723 3,0 105 234,000** bearings in new standard NEW FORCE

Double Direction Thrust Ball Bearings d2 = 10 to 140 mm

Main dimensions

Basic loadcapacity

Limit stress load

Limit frequency for greasing rotation

Bearing indication Connecting dimensions Weight

Coefficient of minimum axial loadDynam-

ic Static

d2 D d3 D1 H B rs r1s Ca Coa Pu

Plastic lubricant Oil d2 da Da ra rb ~

min min min max max maxmm kN kN min-1 mm kg

130 215 214,5 153 89 20 1,50 1,10 235,60 733,3 24,67 970 1400 52230M 130 150 175 1,5 1,0 11,37 3,000140 225 224,5 163 90 20 1,50 1,10 239,20 768,2 25,17 1040 1400 52232M 140 160 186 1,5 1,0 12,16 3,300150 240 239,5 173 97 21 1,50 1,10 283,20 929,6 29,51 920 1200 52234M 150 170 198 1,5 1,0 14,92 4,600

** bearings in new standard NEW FORCE

Steel Industry

In the steel industry, bearings can be found in a vast range of plant equipment that is used in processes: from the storage yard for raw materials to the steelmaking, rolling and refining processes.

The operational environment for these bearings is unique to steelmaking, comprising steel dust, water and heat. In addition, the bearings may have to cope with heavy loads and vibration shock, operational speeds ranging from extremely slow through to high, coupled with rapid acceleration and deceleration.