A型端盖式滑动轴承

For Shaft Diameter Range 80 355 mm Main Application Field

Electric Machines

The EF type slide bearings are a variation of the E type bear ing modular system. They are flange mounted slide bearings with the mounting flange at one end of the housing. This design is mainly used for elec tric machines.

This leaflet contains data

required for design incorporat ing EF type bearings as far as they are not contained in the main catalogue “RENK Slide Bearings Type E”.

All parts of the variants men tioned in this leaflet are avail able from stock.

Bearing Housing

The finned EF type housings are made from a high quality cast iron (EN GJL 300) and are designed for high duty performance. Other materials such as, for instance, nodular cast iron EN GJS 400 15 or cast steel GS 45 can be sup plied by special arrangement. Bearing Shell

The shells are spherically seat ed in the housing. They con sist of a supporting steel body lined with lead based RENKmetal therm / V6. Both design and manufacture are in accordance with the highest standards required in heavy engineering: trouble free assembly and long life even under severe operating conditions.

EF type bearings are mostly equipped with shells with plain cylindrical bore and lubricating oil ring. Shells are available either for self contained oper ation (E.NL.) or prepared for external oil circulation (E.ZL.). Apart from bearings without thrust parts (type...Q) there are shells with plain white metal lined shoulders (type...B) to absorb limited noncontinous axial loads, as well as shells with built in taper land faces (type...K) which will absorb medium axial loads.Seals

EF type bearings with floating

labyrinth seals (type 10) are

used for standard applica

tions. They consist of a fibre

reinforced, highly heat resist

ant material RENKplastic

therm P 50, and are not sub

ject to wear. This seal con

forms to protection grade

IP44. Higher protection

grades (up to IP 56) can be fit

ted under the modular system.

To protect machines fitted

with EF type bearings against

any interference from inside

(e.g. vacuum or strong air cir

culation) EF type bearings

should be used generally only

with additional “machine

seals”. Such seals are fitted to

the inside of the machine end

shield forming a sealing gap

with the shaft.

RENK Hannover can supply a

machine seal (made of a non

corrosive alloy). Optionally the

air tightness of this machine

seal can be improved by

inserting a Hemp Tallow

Packing (HTP) in the standard

circumferential groove of the

seal.

The space between housing

and machine seal is connect

ed to atmosphere so that no

vacuum or strong air turbu

lence can occur at the internal

bearing seal.

Oil Supply

Self lubrication by means of a

loose oil ring for peripheral

shaft speeds up to 20 m/s.

The lubricating oil delivered to

the internal perimeter is trans

ferred by the loose oil ring

directly to the shaft. Where

bearings are lubricated by oil

circulation systems, loose oil

rings can be used with periph

eral shaft speeds of up to 26

m/s to permit emergency

shut down without damage.

Loose oil rings can also be

used for marine applications.

In this case additional guide

bushes are built into the

shells.

Electrical Insulation

As a protection against stray

currents conducted by the

shaft, EF type bearings can

also be supplied as insulated

versions. To do so, the spheri

cal bearing shell seating within

the housing is electrically insu

lated using an insulating foil or

a plastic insertion shell. All EF

type bearing housings “with

spherical insulation” are avail

able from stock.

Heat Dissipation

Frictional heat is often dissi

pated merely by radiation and

convection only: “natural cool

ing”. Depending on the shaft

diameter, speeds of up to

3600 min 1are admissible.

Because of their advanced

design, EF type bearings with

natural cooling can now be

used for a wide range of appli

cations.

Oil coolers (with seawater

resistant finned cooler tubes)

incorporated in the oil sump

can be used in addition.

Dimensions on request. EF

type bearing housings are

generally suitable for connec

tion to an oil circulating sys

tem.

In such case the oil level in the

housing is defined by the weir

in the oil outlet pipe of our

supply.

Temperature Control

Two independent thermosen

sors which are commercially

available can be used for tem

perature control. We would

recommend the use of RENK

resistance thermometers or

RENK angle thermometers for

direct visual control.

Oil Selection

Generally any branded mineral

oil of low foaming tendency

and good resistance to ageing

can be used as a lubricant.

The correct viscosity for each

operating condition should be

checked by EDP calculation.

Such calculations are carried

out at the design stage. A

printout of results computed

can be provided on request.

Technical InformationEF.LQ

EF.LB

EF.LK

1)Diameter of finished surface of machine end shield.2) Attention: Immersion depth t for thermometer reduced compared with previous design (till 1987).

weight oil quantity d 12d 13d 14d 16d 18d 19d 33d 34e 1e 2e 3e 4e 5e 6e 7h 1h 2l t 2)[kg][liters]

115190

6 x M6G 3/8

G 1¼

11

G1

120

90

35

35,5

60

20

85

22,5

175

250

130

270

11546

2,8

115135215 6 x M6G 3/8G 1¼11G11209040

427022,510022,5195280145310135744,7

127165290 6 x M6 G 3/8G 1½11G1½13010060558527,512527,52403401853701651258

145125

1973408 x M8G ½G 1½13G21301007068105301553027040022544019720013

1751502522524008 x M8G ¾G 213G21401108083135401754035045027555023843023

1921773223225258 x M8G ¾G 2½13G216013095106155502205040050032569027277034

267242229

c Type E

d Housing

F =finned flange mounted bearing N =natural cooling

Z =lubrication by oil circulation

with external oil cooling X =lubrication by oil circulation

with external oil cooling e Heat dissipation for high oil throughput

W =water cooling (finned tube

cooler in oil sump)U = circulating pump and

natural cooling

T =circulating pump and

water cooling f Shape of bore and

L = plain cylindrical bore with

type of lubrication*)

loose oil ring lubrication Q =without thrust parts

(non locating bearing)B =plain sliding surfaces

(locating bearing)

g Thrust parts*)

K = taper land faces for both senses

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

of rotation (locating bearing)A =elastically supported circular

tilting pads (locating bearing)

Example

for quoting a slide bearing, type EF , lubrication by oil circulation with external oil cooling, cylindrical bore with loose oil ring lubri cation (for emergency operation), thrust part with taper land faces, size 14, shaft diameter 125 mm:

c d e f g

Slide bearing E F Z L K 14 125

*) if not mentioned see main catalogue, details on request

As for bearing types E.ZL., the oil outlet with weir is to be mounted horizontally at the bottom. The mark at the flange will then be visible centrally at the top.

flange DIN 2573 oil outlet

All connection tap holes in housing are no longer mirror inverted but in line on both sides.G = B.S.P .

Shaft Dimensions

chamfered edges 0,5 x 45°

surface condition DIN ISO 1302

Locating bearing

Type of bearing shell E...K Non locating bearing Type of bearing shell E...Q

not concave

R H 1032 (4.01) P r i n t e d i n G e r m a n y

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

Dimensions of Machine Seals

Also available in split design.

1)Min. inner diameter of the machine seal depends on the diameter of collars for locating bearings due to non split design.

RENK AKTIENGESELLSCHAFT Werk Hannover

Weltausstellungsallee 21D 30539 Hannover

Telephone:+ 49 (5 11) 86 01 0Telefax:+ 49 (5 11) 86 01 288

e mail: gleitlager.hannover@renk ag.com Internet: www.renk.de