Slide Bearings Type EFor Shaft Diameter Range 160�315 mmMain Application Field Electric Machines

RENK series EFWF has beendeveloped as a variation ofthe E�type bearing, based onthe modular component prin�ciple. The EFWF bearings area flange�mounted water�cooled design with fixed oilring lubrication. The mounting flange is locatedlaterally at the end of thehousing. The main applicationfield for this type of bearingsis electric machines in particu�lar for marine application.

This leaflet contains the datarequired for incorporatingEFWF type bearings intomachine designs.

End flange mounted slide bearing type EFWF with water�cooling and lubrication by a fixed oil ring

This brochure gives details ofa range of fixed oil ring lubri�cated EF�bearings, shaft dia�meters 160 to 315 mm, suit�able for use on electricalmachines, fans, water turbinesand pumps.

For information on E�bearingswith smaller shaft diametersrefer to the correspondingRENK brochures.

Bearing HousingThe finned EF housings size22 to 35 are made of highquality cast iron (EN�GJL�300)and are designed for heavyduty performance. Othermaterials, such as EN�GJS�400�18�LT or GS 45 can besupplied in special cases.

Bearing ShellsThe shells are manufacturedfrom steel (C 10) and have aspherical seating. They arelined with RENKmetal therm89 and the working surfacesand the oilways are configur�ated to give long life undersevere operating conditions.Being fully interchangeableensures trouble free assemblyat all times.

The bearing shells for the Etype bearings with lubricationby fixed oil ring have always aplain cylindrical bore.

Apart from bearings withoutthrust parts (type...Q) there areshells with plain white�metallined shoulders (type...B) toabsorb non�continuous axialloads of limited magnitude, aswell as shells with bi�direction�al taper land faces (type...K)which can absorb axial loadsof medium magnitude.

Alternatively the taper landfaces can be supplied suitablefor only one sense of rotation(type...E) to absorb high axialloads.

SealsParticularly for marine applica�tion the EFWF�type bearingssizes 22 to 35 are equippedwith rigid seals (type 20).These seals are made of cor�rosion resistant aluminium

Technical Information

alloys and correspond to pro�tection grade IP 44. Higherprotection grade (up to IP 56)upon request.

For stationary applications thebearings can be also fittedwith floating labyrinth seals(type 10). These seals aremade of fibre reinforced, hightemperature resistant RENKplastic therm P50 and areresistant to wear. The floatinglabyrinth seals correspond toprotection grade IP 44. Higherprotection grades (up to IP 56)are also available.

Special types of seals such asair seals or special machineseals are also available onrequest.

Oil SupplySelf lubrication by fixed oil ringin closed ring channel, up toapprox. 18 m/s speed at theouter diameter of the ring.

The non�locating bearings arefitted with fixed oil rings whichmove in axial direction on theshaft. The oil ring follows themovement of the shaft due tothe friction produced byspring�mounted pressureplates.

For use with locating bearing,the fixed oil ring is designedas collar, which can be eithershrunk onto the shaft ormachined out of the shaftforging.

An oil scraper takes up thelubricant carried to the highestpoint by the fixed oil ring anddelivers it to the oil pockets.The fixed oil ring has an excel�lent performance, ensuringenough lubricant amount evenin the case of combined jour�nal and thrust bearings.

Electrical InsulationTo prevent problems fromelectrical eddy currents, theEFWF bearings can be electri�cally insulated, internally. Insuch cases the spherical seat�ing of the shell is coated witha layer of insulating plasticmaterial.

Also there is an insulatinglayer between rigid labyrinthseal and housing.

Heat DissipationFrictional heat generated isusually dissipated by radiationand natural convection.

Water cooling can also beused, through seawater resist�ant cooling tubes submergedin the oil sump. Dimensionsfor connection upon request.

Temperature ControlTwo independent commercial�ly available thermosensors canbe used for monitoring thetemperature of the bearing.We recommend the use ofRENK resistance thermome�ters; alternatively RENK anglethermometers for direct visualreading.

Oil SelectionGenerally, any branded oil oflow foaming tendency can beused as a lubricant. The cor�rect viscosity for each operat�ing condition will be deter�mined by EDP calculation.Such calculations are alwayscarried out at the designstage. A print�out of theresults can be provided onrequest.

Hydrostatic JackingIn the case of high surfacepressures, provision can bemade for high pressure jack�ing oil. The bottom half shell isprovided with two hydrostaticpockets (one either side of thevertical centre line) with con�nections to a high pressurejacking system via flexiblepipes.

Further OptionsFor applications where thestart�up takes place at lowambient temperatures, thebearings can be fitted with aheater located in the oil sump.

Dimensions of Bearings

1) Seal diameters (d9) are possible with every shaft diameter of one size.2) This dimension is about 3 mm larger in case of insulated bearings.3) Bore available on both sides.

All weight values indicated in this catalogue are average, non�binding values. Thedrawings shown are not strictly binding.

NoteAny additional machine seal on the machine side will be of special design.

Dimensions in mm

Size D B1 B2 B3 B4 b1 b2 b3 b4 b5 b62) b7

2) d1 d2 d3 d4 d5 d6 d7 d8 d91) d10

160 174 225 5 x 26 f. 160 160180 194 245 M24 180 180

22200

209 84 238 15,75 368 150 315 20 20 46 49214 265

500h6 620and

675200

281200

341

225 239 290 1 x M24 225 225200 216 275 5 x 33 f. 200 200225 241 300 M30 225 225

28 250251 105 285,3 18,4 414 170 365 30 25 49 53

266 325600h6 770

and850

250341

250400

280 296 355 1 x M30 280 280250 270 335 6 x 40 f. 250 250280

314300 365 M36 280 280

35300

127 351 19,75 495 200 430 30 30 50 50320 385

850h6 950and

1060300

500300

500

315 335 400 2 x M36 315 315

Non�locating bearingLocating bearing

Oil levelgauge

Type E

Housing F finned end flange mounted

Heat dissipation W water cooling (finned tubes in oil sump)

Shape of boreand type of F plain cylindrical bore, fixed oil ring lubricationlubrication

Q without thrust parts (non�locating bearing)B plain sliding surfaces (guide bearing)

Thrust parts K taper land faces for both senses of rotation (locating bearing)

E taper land faces for one sense of rotation (locating bearing)

Examplefor quoting a slide bearing type EF, water cooling with finned tubes in oil sump, plain cylindrical bore with fixed oil ring, thrust part with taper land faces for both senses of rotation as locating bearing, size 28, shaft diameter 280 mm:

Slide bearing E F W F K 28 � 280

The connection bores are fully interchangeable only as shown(modification or substitution of singular bores is not possible).

⎧⎪⎪⎨⎪⎪⎩

Connection for Connection for Connection for Suction pipe Connection Connection Connection Oil Weight Oilthermosensor 3) cooler hydrostatik for hydrostatic for return pipe for for oil sump inlet outlet content

jacking jacking hydrostatic heater thermometer bore bored11 d12 t e1 e2 f1 d13 e3 f2 d14 d15 jacking d16 d17 d18 d19 d20 h1 h2 L1 [kg] [L]

2 x 2 x approx. approx.G 1/2 13 252 225 0 60 G 3/4 45 40 G 1/4 G 1/2 G 1/4 G 1 1/2 G 1/2 G 3/4 G 3/4 425 315 550 430 21

±5 front

2 x 1 x approx. approx.G 1/2 13 322 321 10 60 G 3/8A 60 40 G 1/4 G 1/2 G 1/4 G 1 1/2 G 1/2 G 3/4 G 3/4 500 325,5 690 770 37

±5 side

2 x 1 x approx. approx.G 1/2 15 360 335 0 125 G 1 115 40 G 1/4 G 1/2 G 1/4 G 2 G 1/2 G 1 G 1 705 375 850 1350 81

±8 side

Load Table

Size Shaft�Ø FR (1) FR (2) Thrust part B (3) Thrust part K (4) Thrust part E (4)D FA FA FA

[mm] [kN] [kN] [kN] [kN] [kN]

160 68 108 3 12 20180 76 121 4 14 22

22200 84 135 4 15 24225 95 152 5 16 26200 105 168 5 18 29225 119 189 6 20 32

28250 132 210 7 21 35280 147 236 8 23 38250 159 254 7 24 39280 178 285 8 27 43

35300 191 305 9 28 45315 201 320 10 29 47

The table serves only toselect the size of E�Type bearing. Before booking anorder, however, it will be ne�cessary to carry out an EDPcalculation, taking intoaccount the reciprocal influ�ence of operating parameters.

1. Radial loads FR in [kN] aspermanent load withouthydrostatic jacking (maxi�mum value) for plain cylin�drical bores.

2. Radial loads FR in [kN] aspermanent load withhydrostatic jacking (maxi�

mum value) for plain cylin�drical bores.

3. Axial load FA in [kN] whichcan be taken only for ashort time (maximumvalue).

4. Axial load FA in [kN] as per�manent load (maximumvalue).

1) For shaft dimensions see also our “Manual for the application of RENK slidebearings” or the computed calculation.

Note: the listed shaft dimensions do not take into consideration the fitting of anadditional machine seal (special design).

Tolerances of form and position follow DIN 31 699.Degree of accuracy B 10; others upon request.

Shaft Dimensions

Non�locating bearing(axial clearance ± 5)

Locating bearing(axial clearance ± 0,25)

Size D1) b1 b2 b3 b4 b5 b6 d1 d2 d3 r1 r2

160 160 185

22180

38 126 95 15 233 110 350180 205

4 6200 200 225225 225 250200 200 225

28225

38 150 100 15 275 120 425225 250

4 6250 250 275280 280 305250 250 280280 280 310

35300

57 182,5 105 15 338 120 535300 330 4 6

315 315 345

Dimensions in mm

Chamfered edges 0,5 x 45° Surface condition DIN ISO 1302

Hydrostatic Jacking Unit for Bearings with Fixed Oil Ring

This plan refers to a hydrostatic jack�ing unit mounted to a console, withtwo pump�motor unit with four pres�sure switches.

1.0 pump�motor unit 2.0 redundant pump�motor unit3.0 shuttle valve4.0 terminal box5.0 filter6.0 volume governor7.0 terminal box7.1 pressure switch7.2 pressure switch7.3 pressure switch7.4 pressure switch7.5 manometer8.0 flow governor9.0 terminal box with flange

Connecting Plan for Hydrostatic Jacking

Sales Organisation

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We reserve the right to changes made in the interests of technical improvement.

Sales Agencies

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RENK AKTIENGESELLSCHAFTWerk HannoverWeltausstellungsallee 21D�30539 HannoverPhone: +49 (5 11) 86 01�0Fax: +49 (5 11) 86 01�288Email: info.hannover@renk.bizInternet: www.renk.biz

Headquarters andManufacturing Plant

Assembly and Distribution Centerswith Sales and Engineering Support

RENK Corporation304, Tucapau Road29334 Duncan S.C.USAPhone: (1�8 64) 4 33 00 69Fax: (1�8 64) 4 33 06 36

MAN B&W (Japan) Ltd.RH Division; Fuji Building (Room 121)3�2�3 MarunouchiChiyoda�ku, Tokyo 100�0005JapanPhone: (81�3) 3215 1310Fax: (81�3) 3284 0867

Manufacturing Plant

OMEGA RENK BEARINGS PVT. LTD.Anand Nagar, Raisen RoadBhopal � 462 021IndiaPhone: (91 �7 55) 5 28 45 61Fax: (91 �7 55) 2 75 16 26Email: omtec@sancharnet.inInternet: www.omegarenk.com

COFICAL RENK MANCAIS DO BRASIL LTDA.Rodovia BR�280,km 54 � Em frente ao Parque Municipal deExposiçõesCEP 89270�000 � Guaramirim � SC � BrasilPhone: (55�4) 737 36 400Fax: (55�4) 737 36 499