Slide Bearings Type E For Shaft Diameter Range 80 …

1 Slide Bearings Type EFor Shaft Diameter Range 80-355 mm main Application field electric Machines2cTypeEdHousingRfinned, foot mountedGsmooth, foot mountedF*)finned, flange mountedM*)finned, centrally flange mountedeHeat dissipationNnatural coolingZlubrication by oil circulation with external oil coolingXlubrication by oil circulation with external oil cooling for high oil throughputWwater cooling in oil sumpUcirculating pump and natural coolingTcirculating pump and water cooled oil sumpfShape of bore and type of lubricationCplain cylindrical bore, without oil ringLplain cylindrical bore, with loose oil ringF*)plain cylindrical bore, with fixed oil ringYtwo lobe bore (lemon shape), without oil ringVfour lobe bore (MGF profile)

2 , without oil ringK*)journal tilting pads, without oil ringgThrust surfaceQwithout thrust parts (non locating bearing)Bplain sliding surfaces (locating bearing)Etaper land faces for one sense of rotation (locating bearing)Ktaper land faces for both senses of rotation (locating bearing)Aelastically supported circular tilting pads (RD thrust pads) (locating bearing)Examplefor quoting a complete bearingcdefgE R N L B11 110 Slide bearing type E with finned housing, foot mounted, natural cooling, plain cylindricalbore with loose oil ring, as locating or non locating bearing, plain sliding surfaces, size 11,110 mm Shaft Diameter .

3 *) Ask for special leaflets and technical :above left: Slide bearing EGXYQ 28 300(Photo: GEC Alstom, F Belfort)above right: Slide bearing EFZLB 11 110(Photo: Siemens AG,D Erlangen)middle left:Tandem bearing arrangementEFZLQ/A 28 280(Photo: K hnle, Kopp &Kausch, D Frankenthal)Middle right: Slide bearing EMNLB 14 140(Photo: Brush Electrical,GB Loughborough)below left: Slide bearing EMZLA 14 140(Photo: Escher Wyss,D Ravensburg)below right: Slide bearing ERZLB 35 355(Photo: GEC Alstom,F Belfort)This pump sucks cool oil fromthe bearing sump and deliversto the oil inlet bore. ContentsDescription of the design system4 Operating methods6 Technical indications8 Bearing shelldimensions10 Seal dimensions11 Bearing temperature/speed graph12/13 Oil throughput graphs14/15 Bearing clearances16 RENK E Type Bearings areslide Bearings of the most up to date design which can beassembled together, to suitrequirements in a number ofalternative ways by using pre fabricated were developed primarilyas Bearings for electricmachines, blowers.

4 Turbocom pressors and horizontal waterturbines but in view of thepossibility of fitting them withdifferent alternative compo nents they can be used almostuniversally in the particular advantage ofinstalling them in productionplants ( refineries, powerstations, iron and steelworks)is to reduce the number ofparts which have to be carriedin stock as it is often possibleto equip driving and drivenmachines with the same different design types areavailable from stock in therange of diameters from 80 to355 E Bearings with boresexceeding 300 mm diameterfurther technical information isavailable on weights givenin the tables are notbinding average values and the illustra tions are not strctly may be made in the interestof technical document is copyright(DIN 34).

5 3 RENK Slide Bearings Type EUnit composed systemThe use of the unit composedprinciple in the planning of theE Type series of Bearings wasa far reaching accomplish ment. The different combina tions of Slide Bearings are, incase of need, assembled fromstock components and sub assemblies. This ensures thatthere is the quickest possibledelivery of spare parts fromthe Hannover of the partsis guaranteed and a bearingshell with plain shoulders, forexample, can be replaced ifnecessary by one with integraltaper land thrust HousingDepending on the operatingconditions, the bearing hous ings are supplied either withfins or as a smooth design.

6 (Flange Bearings are finneddesign only.)The housings are to be con sidered as main module inDescription of the Design Systemthe E Type bearing unit com posed system and when theyare combined with different complementary modules ,such as bearing shell, lubricat ing ring, thermometer andother accessories, additionalmachining is frequently unnec essary. Even in special cases( the fitting of oil coolers orvibration detectors) finishmachined housings are takenfrom stock and provided withadditional connection holes for thermometer,oil inlet and outlet, oil level, oilsump thermometer or circulat ing pump suction piping areprovided on either side of thehousingThe rigid housing design isrecognized for its good distri bution of forces under radialand axial loading conditionsresulting in a heavy load car rying capacity.

7 The height ofthe centre line is such thatbrackets can be attached tothe end plates of electricmachines for receiving thepedestal bearing. When theshells and seals have beenremoved the housing can beeasily removed as well axiallywithout the rotor having to bedismantled. If the housings arestanding on intermediatebrackets they can be loweredand withdrawn sideways afterremoving the Bearings with insulatedshells, the spherical seating ofbearing housings is lined withsynthetic material. In addition,the Shaft seals are made ofinsulating material or an inter mediate insulation will bemounted when assembling theseals (insulated flange mount ed Bearings are available fromstock).

8 The housing material is castiron (EN GJL 300); nodularcast iron (EN GJS 400 18 LT)or cast steel can be suppliedfor special types of seals can beprovided depending on theoperating conditions (seep. 12).1. For normal conditionsfloating labyrinth seals ofhigh quality fiber rein forced synthetic materialwhich are floating in theseal carrier (Type 20) areused with E Bearings . Thistype of seal has variousadvantages to offer: it is insensitive to radialdisplacement of theshaft, resulting for exam ple, from Shaft bendingor from lifting the rotorwhen taking out theshell.

9 It conforms to thetype of protection IP 44 for dismantling the bear ing shell ( for inspec tion) only fasteningscrews in the bearingtop have to be loosened,the labyrinth sealremaining on the shaft45 should the seal be dam aged only the seal itselfneed to be replaced(inexpensive) independent of the bear ing size the samelabyrinth seals are usedfor a given Shaft diame ter in way of the deliveries aretherefore possible inview of the Bearings which call for ahigh oil throughput areprovided with seals withtwo labyrinth systems(Type 20) The first twolabyrinths deflect any oilwhich leaves the bearingshell.

10 Smallquantities ofoil which have not beenwiped off by these twolabyrinths are collected inan intermediate chamberand then fed back, throughreturn holes, to the oilsump. Five furtherlabyrinths then act as theseal proper they pre vent oil from leaking andalso the ingress of foreignparticles into the inside ofthe bearing. This seal con forms to the type of pro tection IP For operation in dustyenvironments the sealsType 10 or 20 will beequipped with dust flingers(see page 12), which alsoprevent any possible lowpressure on the Shaft exitside from drawing oilfrom inside the seal combinationshave the designation 11 or21.