Performance Test Data

Performance Test Data

ULTAGE Sealed Four Row Tapered Roller Bearings for Rolling Mill Roll-Necks [CROU..LL Type]

●Water Resistance Durability Test

[Test conditions] Bearing number: ULTAGE sealed four row tapered roller bearing CROU-6001LLAX1 (Dimensions:φ300×φ420×310, Cr: 3600 kN, C0r: 7650 kN) Prelubricating grease: Palmax RBG Radial load: 390 kN (0.11 Cr) Running speed: Cyclic operation where one cycle consists of ⇒300 min-1 (0.5 h) ⇒ 500 min-1 (1 h) ⇒ standstill (1 h) Water spray: 0.15 L/min Total running hours: 1000 h

●Life test result

[Test conditions] Bearing number: Comparison of conventional design and ULTAGE in terms of life 30316U (dimensions:φ80×φ170×42.5) Lubrication: Turbine Oil VG68, circulating lubrication Combined radial and axial loads: 117 kN/bearing (0.4 Cr equivalent, radial load: 75 kN/bearing, axial load: 50 kN/bearing) Running speed: 2000 min-1

Misalignment: 1/600 (0.1˚)

Structure of test rig

Appearance of test rig

Rollers on side A Outer ring on side B Outer ring on side C Outer ring on side DRollers on side D

0.03% 0.02% 0.02% 0.03% 0.02%

0.27% 0.03% 2.01% 0.03% 0.04%

Appearance ofassembled inner ring

Appearance ofouter ring

Flaking

Flaking

No damage

No damage

Status


ULTAGE bearings boast a life 2.6 times as long as their design life, and twice as long as the life of conventionalbearings, when both bearing types are tested under test conditions of 0.4 Cr and 1/600 misalignment.

A B C D

Load

Test bearing

Test bearing 2Test bearing 1

Waterspray

Fr

Fa

Flaking occurred nearthe chamfered end ofrollers as well as at thecorresponding contactpoint on the outer ring.(L10 = 225 h)

After termination of thetest at 690 hours, thetest bearing was freefrom any failuresincluding flaking.

[Test result]

Conventional designL10 life 225 h(n = 6)

CalculatedL10 life173 h

ULTAGE designMinimum L10 life 450 h(n = 6)

99

80

50

20

10

5

1101 102 103 104

Cum

ulat

ive

frac

ture

pro

babi

lity

(%)

Life (h)

[Status of bearing interior after test, and water content in grease (wt%)]* Water content in factory-fresh grease is in the range of 0.001% to 0.04%.

Con

vent

iona

lse

alH

igh

sea

ling

seal

Evidence of water intrusion is found on the conventional seal. In contrast, the NTN “high sealing”seal does not exhibit evidence of water intrusion.

Con

vent

iona

lde

sign

ULT

AG

E

HEADQUARTERSNTN Corporation URL http://www.ntn.co.jp1-3-17, Kyomachibori, Nishi-ku, Osaka-shi, Osaka 550-0003 Japan

Phone: +81-6-6443-5001

NTN USA Corporation URL http://www.ntnamerica.com1600 E. Bishop Court, P.O. Box 7604, Mount Prospect, IL 60056-7604, U.S.A. Phone: +1-847-298-7500 Fax: +1-847-294-1209

SALES NETWORKNTN Bearing Corp. of AmericaHead Office / 1600 E. Bishop Court, P.O. Box 7604, Mount Prospect, IL 60056-7604, U.S.A. Phone: +1-847-298-7500 Fax: +1-847-699-9744Central Sales Office / 2413 North Main Street, East Peoria, Illinois 61611 Phone: +1-309-699-8600 Fax: +1-309-699-8670NTN Automotive Center / 39255 W. 12 Mile Road, Farmington Hills, MI 48331-2975, U.S.A. Phone: +1-248-324-4700 Fax: +1-248-324-1103

NTN Bearing Corp. of Canada Ltd. URL http://www.ntn.caHead Office / 305 Courtneypark Drive West, Mississauga, Ontario, L5W 1Y2, Canada Phone: +1-905-564-2700 Fax: +1-905-564-7749Vancouver Branch / 106B - 3680 Bonneville Place Burnaby, B.C. V3N 4T6, Canada Phone: +1-604-444-2007 Fax: +1-604-444-2665Edmonton Branch / 4608-97th Street, Edmonton, Alberta T6E 5N9, Canada Phone: +1-780-435-6200 Fax: +1-780-435-3600Toronto Branch / 305 Courtneypark Drive West, Mississauga, Ontario L5W 1Y4, Canada Phone: +1-905-564-9600 Fax: +1-905-564-9609Montreal Branch / 4973 Levy Street, Ville, St-Laurent, Quebec, H4R 2N9, Canada Phone: +1-514-333-8054 Fax: +1-514-333-1078

NTN Wälzlager (Europa) GmbH.URL http://www.ntn-snr.comHead Office / Max-Planck-Str. 23, 40699 Erkrath, F.R. Germany Phone: +49-211-2508-0 Fax: +49-211-2508-400Stuttgart Branch / Plieninger Str. 63B, 70794 Filderstadt F.R. Germany Phone: +49-711-123901-0 Fax: +49-711-123901-660München Branch / Parkring 4, 85748 Garching (München), F.R. Germany Phone: +49-211-2508-0 Fax: +49-211-2508-555Hamburg Branch / Barkhausenweg 7, 22339 Hamburg, F.R. Germany Phone: +49-211-2508-0 Fax: +49-211-2508-415Italy Branch / Via Maestri del Lavoro, 3/A, 40138 Bologna, Italy Phone: +39-051-535174 Fax: +39-051-538492

NTN Bearings (UK) Ltd. URL http://www.ntn-snr.comWellington Crescent, Fradley Park, Lichfield, Staffordshire, WS13 8RZ, U.K. Phone: +44-1543-445000 Fax: +44-1543-445035

NTN-SNR ROULEMENTS. URL http://www.ntn-snr.comHead Office / 1, rue des Usines B.P. 2017 74010 Annecy Cedex, France Phone: +33-4-50-65-30-00 Fax: +33-4-50-65-32-91Lyon Branch / Le Florentin, 71, Chemin du Moulin Carron, BP8-69570 DARDILLY, France Phone: +33-4-78-66-68-00 Fax: +33-4-78-66-68-20Paris Branch / 6, rue Auguste Comte, BP49, 92174 Vanves Cedex, France Phone: +33-1-40-93-66-00 Fax: +33-1-40-93-66-10Cran Gevrier Branch / 6 route de la Salle, 74960, Cran Gevrier, France Phone: +33-4-50-65-93-00 Fax: +33-4-50-65-93-46

SNR Wälzlager GmbH. Duesseldorf Branch / Max-Planck-Str. 23, 40699 Erkrath, F.R.Germany Phone: +49-211-2508-0 Fax: +49-211-2508-400 Bielefeld Branch / Friedrich-Hagemann-Straße 66, 33719 Bielefeld, Germany Phone: +49-521-9-24-00-0 Fax: +49-521-9-24-00-90 Stuttgart Branch / Plieninger Str. 63B, 70794 Filderstadt F.R.Germany Phone: +49-711-123901-0 Fax: +49-711-123901-660

SNR Italia / Via Riccardo Lombardi, 19/4, 20153 Milan, Italy Phone: +39-02-47-99-86-00 Fax: +39-02-33-50-06-56NTN-SNR Rodamientos Ibérica / Calle Barberán n˚6, 28035 Madrid, Spain Phone: +34-916-71-89-13 Fax: +34-916-73-65-48NTN-SNR Rulmenti / Zona Industriala-Vest, 6 Strada Salzburg, 24 00 SIBIU, Romania Phone: +40-269-20-35-00 Fax: +40-269-20-35-25NTN-SNR Marocco / 73, boulevard Moulay Slimane, Ain Sebaâ Casablanca, BP 15873 Casa-Principal, Marocco Phone: +212-522-66-76-80 Fax: +212-522-66-5166

NTN Bearing-Singapore (Pte) Ltd. URL http://www.ntn.com.sgHead Office / No.9 Clementi Loop Singapore 129812 Phone: + 65-64698066 Fax: +65-64695400Philippine Representative Office / Unit 1002 Philippine Axa Life Centre Condominium Corporation Sen. Gil Puyat Ave Corner Tindalo Street Makati City, Philippines Phone: +63-2-759-4407 Fax: +63-2-759-4409India Representative Office / 805, International Trade Tower, Nehru Place, New Delhi 110019, India Phone: +91-11-51513234 Fax: +91-11-51513236Indonesia Representative Office / Summitmas 1., 18th Floor, Jl. Jend. Sudirman Kav. 61-62, Jakarta 12190, Indonesia Phone: +62-21-252-2081 Fax: +62-21-252-2082Vietnam Representative Office / 303, 3rd of Thanh Dong Building 132 - 138 Kim Ma Str., Ba Dinh Dist., Ha Noi, Viet Nam Phone: +84-4-37347661 Fax: +84-4-37347662

NTN (China) Investment Corp. URL http://www.ntn.com.cnShanghai Head Office / No.6 building No.1666 Nanle Road, Songjiang Industrial Zone, Songjiang, Shanghai, China Phone: +86-21-5774-5500 Fax: +86-21-5778-2898Beijing Branch / Units 08, EF floor, West Tower, LG Twin Tower, 12 Jian Guo Men Wai Yi, Chaoyang District, Beijing, China 100022 Phone: +86-10-6568-3069 Fax: +86-10-6568-2278Guangzhou Branch / Rm 7306 CiticPlaza, 233 Tianhe North Road, Guangzhou, China 510613 Phone: +86-20-3877-2943 Fax: +86-20-3877-2942Nanjing Branch / 18A, Nanjing IFC, NO.1 Hanzhong Rd, Baixia district, Nanjing, CHINA 210029 Phone: +86-25-8477-5355 Fax: +86-25-8477-5360

NTN China Ltd. URL http://www.ntnchina.comHong Kong Office / Room 1914-15, Park-In Commercial Centre, 56 Dundas Street, Mongkok, Kowloon, Hong Kong Phone: +852-2385-5097 Fax: +852-2385-2138

NTN Bearing-Thailand Co., Ltd.Head Office / 12th Floor, Panjathani Tower, 127/15 Nonsee Road, Chongnonsee Yannawa, Bangkok 10120, Thailand Phone: +66-2-681-0401 Fax: +66-2-681-0408Khon Kaen Branch / 189-191 Ruen Rom Road Tambon Nai-Muang, Amphur Muang, Kohn Kaen, 40000, Thailand Phone: +66-43-223679 Fax: +66-43-223061Haad Yai Branch / 198-198/1 Nipat U-Thid 2 Road, Amphur Haad Yai, Songkhla, 90110, Thailand Phone: +66-74-236568 Fax: +66-74-231520Bangna Branch / 35/35 Bangna-Trad Road, KM11 Bangplee, Samutprakarn, 10540, Thailand Phone: +66-2-7501732 Fax: +66-2-7501731Chiangmai Branch / 46/8-10 Thy wang Rd. Changmoi sub.district, Munag district, Chiangmai province, 50300 Thailand Phone: +66-53-874328 Fax: +66-53-874330

NTN Bearing-Malaysia Sdn. Bhd.Head Office / No.2, Jalan Arkitek U 1/22, Hicom Glenmarie Industrial Park, 40150 Shah Alam, Selangor, Malaysia Phone: +60-3-55696088 Fax: +60-3-55690200Butterworth Branch / 4700, Jalan Permatang Pauh, 13400 Butterworth, Malaysia Phone: +60-4-3328312 Fax: +60-4-3324407Ipoh Branch Office /65, Medan Kidd, Kinta Mansion, 30200 Ipoh, Malaysia Phone: +60-5-2547743 Fax: +60-5-2538077Kuantan Branch / B-72, Ground Floor, Jalan Beserah 25300 Kuantan, Malaysia Phone: +60-9-5141132 Fax: +60-9-5141164Johor Bahru Branch / 51 Jalan, Sri Bahagia 5, Taman Sri Bahagia, Tampoi, 81200 Johor Bahru, Malaysia Phone: +60-7-2364929 Fax: +60-7-2370897

PT. NTN Bearing IndonesiaC-21, 22 MM2100 Industrial Town, Cikarang Barat, BEKASI 17520 West Jave Indonesia Phone : +62-21-252-2081 Fax : +62-21-252-2082

NTN-CBC (Australia) Pty. Ltd.3, The Crescent, Kingsgrove, NSW 2008, Australia Phone: +61-2-99479200 Fax: +61-2-95543311

NTN de Mexico, S.A. URL http://www.ntnmexico.com.mxMexico Head Office / Emilio Cárdenas No.158 Apdo.124, C.P.54030, Tlalnepantla, Edo.deMéxico, Mexico Phone: +52-55-5390-1133 Fax: +52-55-5565-8545Guadalajara Branch / Calle 22 No.2465, Zona Industrial, C.P.44940, Guadalajara, Jalisco, Mexico Phone: +52-33-3145-1448 Fax: +52-33-3145-1594Monterrey Branch / Av. Ruiz Cortines No.1336 Ote, Col. La Purisima, C.P.67120, Cd. Guadalupe, Nuevo Leon, Mexico Phone: +52-818-334-9931 Fax: +52-818-334-9932Mexicali Branch / Blvd. Benito Juárez No.3293 Esq. Ayuntamiento, C.P.21360, Mexicali, BCN, Mexico Phone: +52-686-563-3632 Fax: +52-686-582-2057Veracruz Branch / María Auxiliadora No.687 Esq. J.F.Molina, C.P.91870, Col. Los Pinos, Veracruz, Mexico Phone: 52-229-934-4757 Fax: +52-229-938-0457

NTN Sudamericana, S.A.URL http://www.ntnsudamericana.comWorld Trade Center Panama Calle 53 Este, Urbanización Marbella Piso NO.16, Oficina 1601 Apartado Postal 832-0487, Panamá, Rep.de Panamá Phone: +507-269-4777 Fax: +507-264-5592

NTN do Brasil Ltda. URL http://www.ntn.com.brAv. Moema, 94-9˚ Andar-conj, 92a94 CEP 04077-020-Indianópolis-São Paulo-SP, -Brasil Phone: +55-11-5051-0600 Fax: +55-11-5051-2807

NTN Korea Co., Ltd.Head Office / 10th Floor, Press Center, 25, Taepyeong-Ro 1-GA, Jung-Gu, Seoul 100-745, Korea Phone: +82-2-720-3665 Fax: +82-2-720-3669Busan Branch / Rm.707, 7th Floor, Daerim Bldg., 341-5 Bujeon 1-Dong, Busanjin- Gu, Busan, Korea, 614-843 Phone: +82-51-811-1351 Fax: +82-51-811-1353

NOTE : The appearance and specifications may be changed without prior notice if required to improve performance. Although care has been taken to assure the accuracy of the data compiled in this catalog, NTN does not assume any liability to any company or person for errors or omissions.

AE72 CAT. No. 3801/E 12. 03. 06. NPrinted in Japan

Sealed Four Row Tapered Roller Bearingsfor Rolling Mill Roll-Necks

[CROU..LL Type]

CAT. No. 3801/E

CROU-4401LLA1X

CROU-4501LLA1X

CROU-4801LLA1X

CROU-4802LLA1X

CROU-5001LLA1X

CROU-5201LLA1X

CROU-6001LLA1X

CROU-6201LLA1X

CROU-8201LLA1X

CROU-8801LLA1X

CROU-8802LLA1X

CROU-10601LLA1X※

CROU-4402LLA1X

CROU-5101LLA1X

CROU-6101LLA1X

CROU-6901LLA1X

CROU-6902LLA1X

CROU-10001LLA1X※

CROU-11901LLA1X

220

225

240

240

250

260

300

310

410

440

440

530

220.662

254.000

304.902

343.052

343.052

501.650

595.312

180250315400500630800

250315400500630800

1 000

0000000

-30-35-40-45-50-75

-100

+750+900

+1 000+1 200+1 200+1 500+1 500

-750-900

-1 000-1 200-1 200-1 500-1 500

303540455075

100

5060708090

105120

23263034385675

295

320

338

338

365

365

420

430

546

590

620

780

314.325

358.775

412.648

457.098

457.098

711.200

844.550

315

230

248

340

270

340

310

350

400

480

454

570

239.712

269.875

266.700

254.000

299.000

520.700

615.950

315

230

248

340

270

340

310

350

400

480

454

570

239.712

269.875

266.700

254.000

299.000

520.700

615.950

0.093～0.106

0.099～0.115

0.104～0.118

0.107～0.123

0.113～0.129

0.115～0.131

0.131～0.147

0.136～0.154

0.173～0.188

0.188～0.204

0.195～0.211

0.244～0.259

0.098～0.111

0.111～0.127

0.130～0.150

0.136～0.158

0.143～0.163

0.206～0.226

0.266～0.282

0.420～0.480

0.360～0.420

0.450～0.510

0.400～0.460

0.420～0.480

0.430～0.490

0.490～0.550

0.520～0.590

0.780～0.850

0.850～0.920

0.880～0.950

1.100～1.170

0.450～0.510

0.430～0.490

0.450～0.520

0.430～0.500

0.500～0.570

0.730～0.800

1.200～1.270

1

1

1

1

1

1

1

1

1.5

1.5

3

3

1

1

1

1

1

3

3

2.5

2.5

2.5

2.5

2.5

2.5

2.5

2.5

2.5

2.5

2.5

2.5

2.5

2.5

2.5

2.5

2.5

2.5

2.5

Bearingnumbers

Boundary dimensions Standardradial clearance

(approx.)mm

mm mm

(1) Inner rings

mm Δdmp Vdp Vdmp

d

over incl. high lowΔB2s, ΔC2s

high lowmax maxKiamax

d D B C r1s min

1 880

1 870

2 320

2 960

2 760

3 340

3 600

4 020

5 520

6 600

7 600

13 400

2 240

2 760

2 800

2 820

3 500

10 000

13 900

4 650

3 700

4 600

6 850

5 300

7 450

7 650

8 900

13 300

16 200

16 700

29 400

4 350

5 700

5 850

5 950

8 150

23 900

33 000

192 000

190 000

236 000

302 000

280 000

340 000

366 000

410 000

562 000

670 000

780 000

1 370 000

228 000

282 000

286 000

288 000

356 000

1 020 000

1 420 000

475 000

375 000

470 000

700 000

540 000

760 000

780 000

910 000

1 350 000

1 650 000

1 700 000

3 000 000

440 000

580 000

600 000

605 000

830 000

2 440 000

3 350 000

235

241

259

257

272

275

318

329

434

462

473

581

240

274

323

360

364

542

638

267

294

309

299

333

327

382

388

504

540

570

710

290

328

379

423

423

642

770

0.33

0.41

0.35

0.40

0.40

0.40

0.40

0.39

0.33

0.33

0.33

0.33

0.33

0.39

0.43

0.47

0.43

0.42

0.33

2.03

1.64

1.95

1.68

1.68

1.68

1.68

1.72

2.03

2.03

2.03

2.03

2.07

1.74

1.56

1.43

1.57

1.60

2.03

Axial load factorConstantAbutment andfillet dimensions

eda Da Y1

3.02

2.44

2.90

2.50

2.50

2.50

2.50

2.56

3.02

3.02

3.02

3.02

3.09

2.59

2.32

2.12

2.34

2.38

3.02

Y2

1.98

1.6

1.91

1.64

1.64

1.64

1.64

1.68

1.98

1.98

1.98

1.98

2.03

1.70

1.52

1.40

1.53

1.56

1.98

Y0

1 Y1 0.67 Y2

Fa

Fr

X Y X Y

≦eFa

Fr＞e

Equivalent radial loaddynamicPr＝XFr＋YFa

staticPor＝Fr＋YoFa For values of e, Y1, Y2 and Yo

see the table below.

Dimension Table (For information about bearing models not listed in the Dimension Table, contact NTN Engineering.)

Metric series Tolerances [JIS 0 Class] Inch series Tolerances [ABMA 0 Class]

Standard Prelubricating Grease

Fit (recommended)

Materials

Bearing Number

Chamfer Dimension

Operating Temperature Range

● Brand: Kyodo Yushi Palmax RBG (L373) ● Fill amount: Space volume ratio 35%

● Metric series: Shaft d6/ Housing G7 ● Inch series: Contact NTN Engineering for technical assistance.

Limiting Speed

●dm・N≦30×104

　　dm：bearing center diameter (mm)＝(d＋D) /2 　　d：bearing bore diameter (mm) 　　D：bearing outside diameter (mm) 　　N：running speed (min-1)

● Inner and outer rings: Case hardening steel ● Rolling element: Bearing steel ※ mark only: Case hardening steel

The values above are shown as a guide, and may not bemet under certain operating conditions.For details, contact NTN Engineering.

Features

● -20 to +120˚C(A-) CROU- 6001 LLA1X PX1

Accuracy codeSeal code

Bearing bore number + added numberBearing type (ULTAGE Series four row tapered roller bearing)

Optional (special heat treatment 1) )

NOTE 1) Carbonitriding

76.2266.7304.8609.6

266.7304.8609.6914.4

0000

+25+25+51+76

(1) Inner rings

Δds

over incl. high low

(3) Radial deflection of inner and outer rings

266.7304.8609.6

304.8609.6914.4

+25+51+76

000

(2) Outer rings

over incl. high low

266.7304.8609.6

304.8609.6914.4

515176

Kia, Kea

Radial runout

over incl.

180250315400500630800

250315400500630800

1 000

0000000

-30-35-40-45-50-75

-100

303540455075

100

50607080

100120140

23263034385675

(2) Outer rings

mmD

over incl. high low max max max

max

(4) Combination width deviation of 4-row bearings

101.6304.8304.8609.6

304.8609.6609.6―

over incl.

―508.0

508.0―

+1 520+1 520+1 520+1 520

-1 520-1 520-1 520-1 520

over incl. high low

1. High load capacity design —the world’s highest level Maximum size and number of rollers help realize high load capacity and longer life.

2. High load resisting design —the world’s highest level Assurance of uniform contact pressure on rolling elements within bearings and against outside loads has helped greatly enhance load resistance performance.

3. Compact high sealing design “High sealing” fluoro-rubber seals, boasting a minimized seal volume, are adopted as standard. Through optimization of the tightening force of the main lip and the provision of a shielding arrangement against foreign substances, the water intrusion volume has been reduced by more than 50%: at the same time, the sub lip helps prevent the outflow of grease.

4. Long-life grease as standard The bearing is prefilled with long-life grease. A rinsing and/or grease prefilling procedure is not necessary when the bearing is installed on the side of the machine.

40%increase

Loadcapacity

®

1rs min

1

2 Standardaxial clearance

2

[CROU..LL Type]

Patent pending

Patent pending

1.9 350 ― 1

Unit : mm

rs min

or r1s min over incl.

rs max or r1s max

2.83.5

3.54

120250

250― 1.5

44.5

5.56

120250

250―

2.5

4.555.5

6.577.5

120250400

250400―

3

kN kgfC0r C0rCr Cr

mm

φD φd φda φDa

B

r1

r

C

●Design that maximizes load capacity —rollers (size and number) as wells as the cage. ●Newly developed crowning

helps improve load resistance performance.

Conventional design

Conventional design

ULTAGE design

ULTAGE design

Critical contact pressure

Axial position on roller

O-ring O-ring

Main lip Sub lip

Main lip(w/ shielding mechanism)

Fluoro-rubber seal

Shieldingmechanism

New crowning designis adopted for rollingelements.

Conventional crowning

Unit : μm

Unit : μmUnit : μm

Unit : μm

Unit : μm

Unit : μmSealed Four Row Tapered Roller Bearingsfor Rolling Mill Roll-NecksThe ULTAGE series sealed four row tapered roller bearings (CROU..LL type) are new standard series productsespecially developed to satisfy the “high load capacity”, “high load resistance performance” and “high sealingperformance” required for steel mill roll-neck applications and to improve reliability through long life design.

The ULTAGE series sealed four row tapered roller bearings (CROU..LL type) are new standard series productsespecially developed to satisfy the “high load capacity”, “high load resistance performance” and “high sealingperformance” required for steel mill roll-neck applications and to improve reliability through long life design.

• Compact seal design helpsmaximize bearing side volume.• Maximization in the size andnumber of rollers helps realize

high load capacity.

• Newly developed crowninghelps reduce and ensureuniform contact pressure.• World’s highest level in

load resistanceperformance.

• Newly developed seal lipdesign significantly reduces

water intrusion volume.• Fluoro-rubber seal boasts

more positive sealingperformance.

Twice asgreat

Loadresistance

Sealingperformance50%

reduction in waterintrusion volume

Compact sealcase design

Seals with improvedwater intrusionperformance

Phosphatecoatingon the entiresurface

High loadcapacity design

High loadresistance design

"ULTAGE " (a name created from the combination of "ultimate," signifying refinement,and "stage," signifying NTN's intentionthat this series of products be employed in diverse applications) is the general name for NTN's new generation of bearings thatare noted for their industry-leading performance.

®

®

Newly developed crowning

Contact pressurereduced by halfC

onta

ct p

ress

ure

Excessively highcontact pressure

Side face of innerring or centerwasher, or side faceof outer ring

Bore diameter face of bearing or outer diameter face ofbearing (Axial direction)

rs min or r1s min (Rad

ial d

irect

ion)

rs max or r1s max

rs

min

or r

1s m

in

rs

max

or r

1s m

ax

rs min or r1s min

Nominalbore diameter

d

Radialdirection

Axialdirection

Ser

ies

Met

ric

seri

esIn

ch s

erie

s

Basic load ratingsdynamic static dynamic static

1 Minimum allowable value of chamfer dimension r. 2 Depending on operating conditions, appropriate values may vary. Contact NTN Engineering for technical assistance.


Nominal borediameter

mmd


mmd


Single borediameter deviation

ΔDs

Single outsidediameter deviation

Nominal outsidediameter

mmD


mmD


mmD


Inner ringradial runout

Inner ringradial runout

Combination width deviation of

4-row bearings

ΔB2s, ΔC2s

Combination width deviation of

4-row bearings

Dimensional toleranceof mean bore

diamteter within plane

Dimensional toleranceof mean outside

diamteter within plane

Borediametervariation

Outsidediametervariation

Mean borediametervariation

Mean outsidediametervariation

ΔDmp VDp VDmp Kea

Performance Test Data


●Water Resistance Durability Test

[Test conditions] Bearing number: ULTAGE sealed four row tapered roller bearing CROU-6001LLAX1 (Dimensions:φ300×φ420×310, Cr: 3600 kN, C0r: 7650 kN) Prelubricating grease: Palmax RBG Radial load: 390 kN (0.11 Cr) Running speed: Cyclic operation where one cycle consists of ⇒300 min-1 (0.5 h) ⇒ 500 min-1 (1 h) ⇒ standstill (1 h) Water spray: 0.15 L/min Total running hours: 1000 h

●Life test result

[Test conditions] Bearing number: Comparison of conventional design and ULTAGE in terms of life 30316U (dimensions:φ80×φ170×42.5) Lubrication: Turbine Oil VG68, circulating lubrication Combined radial and axial loads: 117 kN/bearing (0.4 Cr equivalent, radial load: 75 kN/bearing, axial load: 50 kN/bearing) Running speed: 2000 min-1

Misalignment: 1/600 (0.1˚)


Appearance of test rig

Rollers on side A Outer ring on side B Outer ring on side C Outer ring on side DRollers on side D

0.03% 0.02% 0.02% 0.03% 0.02%

0.27% 0.03% 2.01% 0.03% 0.04%

Appearance ofassembled inner ring

Appearance ofouter ring

Flaking

Flaking

No damage

No damage

Status


ULTAGE bearings boast a life 2.6 times as long as their design life, and twice as long as the life of conventionalbearings, when both bearing types are tested under test conditions of 0.4 Cr and 1/600 misalignment.

A B C D

Load

Test bearing

Test bearing 2Test bearing 1

Waterspray

Fr

Fa

Flaking occurred nearthe chamfered end ofrollers as well as at thecorresponding contactpoint on the outer ring.(L10 = 225 h)

After termination of thetest at 690 hours, thetest bearing was freefrom any failuresincluding flaking.

[Test result]

Conventional designL10 life 225 h(n = 6)

CalculatedL10 life173 h

ULTAGE designMinimum L10 life 450 h(n = 6)

99

80

50

20

10

5

1101 102 103 104

Cum

ulat

ive

frac

ture

pro

babi

lity

(%)

Life (h)

[Status of bearing interior after test, and water content in grease (wt%)]* Water content in factory-fresh grease is in the range of 0.001% to 0.04%.

Con

vent

iona

lse

alH

igh

sea

ling

seal

Evidence of water intrusion is found on the conventional seal. In contrast, the NTN “high sealing”seal does not exhibit evidence of water intrusion.

Con

vent

iona

lde

sign

ULT

AG

E

HEADQUARTERSNTN Corporation URL http://www.ntn.co.jp1-3-17, Kyomachibori, Nishi-ku, Osaka-shi, Osaka 550-0003 Japan

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NOTE : The appearance and specifications may be changed without prior notice if required to improve performance. Although care has been taken to assure the accuracy of the data compiled in this catalog, NTN does not assume any liability to any company or person for errors or omissions.

AE72 CAT. No. 3801/E 12. 03. 06. NPrinted in Japan

Sealed Four Row Tapered Roller Bearingsfor Rolling Mill Roll-Necks

[CROU..LL Type]

CAT. No. 3801/E

Performance Test Data

Documents

Transcript of Performance Test Data