EFWF Bearing

Slide Bearings Type E For Shaft Diameter Range 160 315 mm Main Application Field Electric Machines

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

RENK series EFWF has been developed as a variation of the E type bearing, based on the modular component prin ciple. The EFWF bearings are a flange mounted water cooled design with fixed oil ring lubrication.

The mounting flange is located laterally at the end of the housing. The main application field for this type of bearings is electric machines in particu lar for marine application.

This leaflet contains the data required for incorporating EFWF type bearings into machine designs.

Technical Information

This brochure gives details of a range of fixed oil ring lubri cated EF bearings, shaft dia meters 160 to 315 mm, suit able for use on electrical machines, fans, water turbines and pumps.

For information on E bearings with smaller shaft diameters refer to the corresponding RENK brochures.

Bearing Housing The finned EF housings size 22 to 35 are made of high quality cast iron (EN GJL 300) and are designed for heavy duty performance. Other materials, such as EN GJS 400 18 LT or GS 45 can be supplied in special cases.

Bearing Shells The shells are manufactured from steel (C 10) and have a spherical seating. They are lined with RENKmetal therm 89 and the working surfaces and the oilways are configur ated to give long life under severe operating conditions.

Being fully interchangeable ensures trouble free assembly at all times.

The bearing shells for the E type bearings with lubrication by fixed oil ring have always a plain cylindrical bore.

Apart from bearings without thrust parts (type...Q) there are shells with plain white metal lined shoulders (type...B) to absorb non continuous axial loads of limited magnitude, as well as shells with bi direction al taper land faces (type...K) which can absorb axial loads of medium magnitude.

Alternatively the taper land faces can be supplied suitable for only one sense of rotation (type...E) to absorb high axial loads.

Seals Particularly for marine applica tion the EFWF type bearings sizes 22 to 35 are equipped with rigid seals (type 20).

These seals are made of cor rosion resistant aluminium

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

For stationary applications the bearings can be also fitted with floating labyrinth seals (type 10). These seals are made of fibre reinforced, high temperature resistant RENK plastic therm P50 and are resistant to wear. The floating labyrinth seals correspond to protection grade IP 44. Higher protection grades (up to IP 56) are also available.

Special types of seals such as air seals or special machine seals are also available on request.

Oil Supply Self lubrication by fixed oil ring in closed ring channel, up to approx. 18 m/s speed at the outer diameter of the ring.

The non locating bearings are fitted with fixed oil rings which move in axial direction on the shaft. The oil ring follows the movement of the shaft due to the friction produced by spring mounted pressure plates.

For use with locating bearing, the fixed oil ring is designed as collar, which can be either shrunk onto the shaft or machined out of the shaft forging.

An oil scraper takes up the lubricant carried to the highest point by the fixed oil ring and delivers it to the oil pockets.

The fixed oil ring has an excel lent performance, ensuring enough lubricant amount even in the case of combined jour nal and thrust bearings.

Electrical Insulation To prevent problems from electrical eddy currents, the EFWF bearings can be electri cally insulated, internally. In such cases the spherical seat ing of the shell is coated with a layer of insulating plastic material.

Also there is an insulating layer between rigid labyrinth seal and housing.

Heat Dissipation Frictional heat generated is usually dissipated by radiation and natural convection.

Water cooling can also be used, through seawater resist ant cooling tubes submerged in the oil sump. Dimensions for connection upon request.

Temperature Control Two independent commercial ly available thermosensors can be used for monitoring the temperature of the bearing.

We recommend the use of RENK resistance thermome ters; alternatively RENK angle thermometers for direct visual reading.

Oil Selection Generally, any branded oil of low foaming tendency can be used as a lubricant. The cor rect viscosity for each operat ing condition will be deter mined by EDP calculation.

Such calculations are always carried out at the design stage. A print out of the results can be provided on request.

Hydrostatic Jacking In the case of high surface pressures, provision can be made for high pressure jack ing oil. The bottom half shell is provided with two hydrostatic pockets (one either side of the vertical centre line) with con nections to a high pressure jacking system via flexible pipes.

Further Options For applications where the start up takes place at low ambient temperatures, the bearings can be fitted with a heater located in the oil sump.

Dimensions of Bearings

1) Seal diameters (d ) are possible with every shaft diameter of one size.

9 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. The drawings shown are not strictly binding.

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

Locating bearing

Non locating bearing

Oil level gauge

Dimensions in mm

Size

22

28

35

D

160 180 200 225 200 225 250 280 250 280 300 315

B1

B2

B3

B4

b1

b2

b3

b4

b5

b62)

b72)

209

84

238

15,75

368

150

315

20

20

46

49

251

105

285,3

18,4

414

170

365

30

25

49

53

314

127

351

19,75

495

200

430

30

30

50

50

d1

d2

174 194 214 239 216 241 266 296 270 300 320 335

225 245 265 290 275 300 325 355 335 365 385 400

d3

d4

500h6

620

600h6

770

850h6

950

d5

5 x 26 f.

M24 and 1 x M24 5 x 33 f.

M30 and 1 x M30 6 x 40 f.

M36 and 2 x M36

d6

675

850

1060

d7

160 180 200 225 200 225 250 280 250 280 300 315

d8

281

341

500

d91)

160 180 200 225 200 225 250 280 250 280 300 315

d10

341

400

500

c Type

E

d Housing

F

e Heat dissipation

W water cooling (finned tubes in oil sump)

finned end flange mounted

f Shape of bore and type of lubrication

g Thrust parts

F

⎧ ⎪ ⎪ ⎨ ⎪ ⎪ ⎩

plain cylindrical bore, fixed oil ring lubrication

Q without thrust parts (non locating bearing) B plain sliding surfaces (guide bearing) K taper land faces for both senses of rotation (locating bearing) E taper land faces for one sense of rotation (locating bearing)

Example for 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:

cdefg 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 thermosensor 3) d11

d12

G 1/2 13

Connection for cooler e2

f1 d13

Connection for hydrostatik jacking e3 f2 d14

Suction pipe for hydrostatic jacking d15

Connection for return pipe hydrostatic jacking d16

e1

252

225 0

60 G 3/4

45 40

2x G 1/4

G 1/2

G 1/4

2x G 1 1/2 front

G 1/2

G 3/4

321 10

60 G 3/8A

60 40

2x G 1/4

G 1/2

G 1/4

1x G 1 1/2 side

G 1/2

115 40

2x G 1/4

G 1/2

G 1/4

1x G2 side

G 1/2

322 ±5

G 1/2 15

Connection for oil sump inlet thermometer bore d18 d19

t

±5

G 1/2 13

Connection for heater d17

360 ±8

335 0

125 G 1

Oil outlet bore d20

Weight

Oil content [L]

h1

h2

L1

[kg]

G 3/4

425

315

550

approx. approx.

430 21

G 3/4

G 3/4

500

325,5 690

approx. approx.

770 37

G1

G1

705

375

approx. approx.

1350 81

850

Load Table

Size

22

28

35

Shaft Ø D [mm] 160 180 200 225 200 225 250 280 250 280 300 315

FR (1)

FR (2)

[kN] 68 76 84 95 105 119 132 147 159 178 191 201

The table serves only to select the size of E Type bearing. Before booking an order, however, it will be ne cessary to carry out an EDP calculation, taking into account the reciprocal influ ence of operating parameters.

[kN]

Thrust part B (3) FA [kN]

Thrust part K (4) FA [kN]

Thrust part E (4) FA [kN]

108 121 135 152 168 189 210 236 254 285 305 320

3 4 4 5 5 6 7 8 7 8 9 10

12 14 15 16 18 20 21 23 24 27 28 29

20 22 24 26 29 32 35 38 39 43 45 47

1. Radial loads FR in [kN] as permanent load without hydrostatic jacking (maxi mum value) for plain cylin drical bores.

2. Radial loads FR in [kN] as permanent load with hydrostatic jacking (maxi

mum value) for plain cylin drical bores.

3. Axial load FA in [kN] which can be taken only for a short time (maximum value).

4. Axial load FA in [kN] as per manent load (maximum value).

Shaft Dimensions

Locating bearing (axial clearance ± 0,25)

Non locating bearing (axial clearance ± 5)

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

Dimensions in mm Size

22

28

35

D1) 160 180 200 225 200 225 250 280 250 280 300 315

b1

b2

b3

b4

b5

b6

d1

38

126

95

15

233

110

350

38

150

100

15

275

120

425

57

182,5

105

15

338

120

535

d2

d3

160 180 200 225 200 225 250 280 250 280 300 315

185 205 225 250 225 250 275 305 280 310 330 345

1) For shaft dimensions see also our “Manual for the application of RENK slide

bearings” or the computed calculation.

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

Tolerances of form and position follow DIN 31 699.

Degree of accuracy B 10; others upon request.

r1

r2

4

6

4

6

4

6

Hydrostatic Jacking Unit for Bearings with Fixed Oil Ring

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

1.0 2.0 3.0 4.0 5.0 6.0 7.0 7.1 7.2 7.3 7.4 7.5 8.0 9.0

pump motor unit redundant pump motor unit shuttle valve terminal box filter volume governor terminal box pressure switch pressure switch pressure switch pressure switch manometer flow governor terminal box with flange

Connecting Plan for Hydrostatic Jacking

Sales Organisation

Headquarters and Manufacturing Plant

RENK AKTIENGESELLSCHAFT Werk Hannover Weltausstellungsallee 21 D 30539 Hannover Phone: +49 (5 11) 86 01 0 Fax: +49 (5 11) 86 01 288 Email: info.hannover@renk.biz Internet: www.renk.biz

Sales Agencies Manufacturing Plant

OMEGA RENK BEARINGS PVT. LTD. Anand Nagar, Raisen Road Bhopal 462 021 India Phone: (91 7 55) 5 28 45 61 Fax: (91 7 55) 2 75 16 26 Email: omtec@sancharnet.in Internet: www.omegarenk.com

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RENK Corporation 304, Tucapau Road 29334 Duncan S.C. USA Phone: (1 8 64) 4 33 00 69 Fax: (1 8 64) 4 33 06 36

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

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

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

RH 1222 (08.05) Printed in Germany

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