NonContact Sealn

7/28/2019 NonContact Sealn

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GMN offers two different systems of non-contactseals for wear free sealing of fast turning machinecomponents.

The GMN labyrinth seals are made from steel andaluminium by a special and very sophisticatedproduction process which results in absolute identityof the inner and outer r ings labyrinth profi le.

The GMN gap seals with return drain are made fromhigh quality, highly resistant plastic material.

Non-Contact Seals

Freewheels are unid irect ional coupl ings,t ransmit t ing or support ing torque in one direct ionby f r ict ion and al lowing id l ing in the oppositedirect ion.

GMN manufactures sprag type clutches of twodif ferent sprag sizes to be used as idexing devices,backstops or overrunning clutches.Rol ler ramp supplements are avai lable too.

Freewheel-Clutches

GMN machine spindles represent more than 70years of experience in development, productionand application. They are used for precisionas well as for HSC high-speed processing.A c lo se -kn it ne two rk of de ale rs and re pa ir se rv ic eworkshops guarantees comprehensive serviceand expert advice.

GMN optospindles, air bearings and scannersare setting new standards in image projection.They have been developed for maximum runningaccuracy as well as stabil i ty in rotational speedand phase.

Spindles

GMN produces high precision ball bearings inprecision class P4 (ABEC7) or better as spindlebearings (angular contact bearings), radial deepgroove ball bearings as well as hybrid bearingsand special bearings.

In addition GMN offers complete bearing units.

A var ie ty o f soli d lub ri ca nt co at in g i s ava il ab le foroperation under vacuum.

High Precision Ball Bearings

In Nrnberg, GMN Paul Mller

Industr ie GmbH & Co. KG

produces with an exper ience of

more than 90 years high

precision bal l bear ings,

machining spindles, free-wheel

clutches and non-contact seals

for a wide scope.

Most of the products are made

for special appl icat ions

on customer requests.

A world wide net of service

stat ions support a l l demands

of our customers.

is the trademark of

Paul Ml ler Industr ie GmbH & Co. KG.

This catalog ref lects the latest design

features at the t ime of pr int ing.

The company reserves the r ight to

change designs and specif icat ions at

any t ime.

Reprint , photomechanical reproduct ions

as wel l as reproduct ion from cl ippings

only with l icense of

Paul Ml ler Industr ie GmbH & Co. KG.


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Paul Mller Industrie GmbH & Co. KG

CatalogNon Contact Seals

Catalogue No. 8051 05/04 E

3


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Contents Both Systems 4

General Information Benefits Applications 5

Comparison of Contact Seals and Non-Contact Seals 6

General Information Labyrinth Seals 7

General Information Gap Seals 9

Mating Parts 12

Mounting Instructions for Both Systems 13

Table of Dimensions Labyrinth Seals 14

Table of Dimensions Gap Seals 15 17

Typical Applications 18 21

Tolerance Table 22

Technical Advice The new production program 23

The GMN Labyrinth Seal

This seal is manufactured from steel andaluminium. The high accuracy of inner andouter rings labyrinth profile is achieved bya special production process. By thisprocess, the non-separable connection ofthe steel inner ring and the aluminum outerring is achieved.

The GMN Gap Seal

It is produced of high quality plastic material,which provides remarkable resistance toa wide variety of chemicals. The materialis bacteriastatic and fungistatic andtherefore utilized frequently in the FoodProcessing Industry.

ContentsBothS

ystems


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5

Modern design, with respect to minimumloss of energy, requires long life and lowestpower loss due to friction of all compo-nents. One of GMN's answers to thischallenge is a wide range of high qualityand high precision ball bearings. Anotheranswer is producing non-contact seals oftwo different types.

GMN have designed complete units readyfor mounting. They give economic solutionsfor many sealing problems, which allownon-contact sealing of rotating machineparts.

GMN Labyrinth Seals are produced frommetallic material, inner ring steel; outerring aluminium, by a special and patentedproduction process, which guarantees thetotal identity of inner rings and outer ringslabyrinth profile. Thus a highly efficient sealagainst splashing liquids and/or coarseand fine granular contaminants is achieved.GMN Seals can be used for manyapplications under extreme conditions,high speed and high temperatures. Thestandard model can be used up totemperatures of 170 C (340 F) at thealuminium outer ring. Temperature of theshaft and seals inner r ing may be higher.If a non-contact seal in needed for highertemperatures please contact our technicalstaff.

The GMN Gap SealFor the standard model a high quality plasticmaterial is used which provides remarkableresistance to a wide variety of chemicals.

This material enables the seal to be usedin a broad range of applications. It is oftenused in the Food Processing Industries.

The plastic material which is of a highstrength can be used for temperatures of40 C to 60 C (40 F to 140 F).

A very high accuracy of the labyrinth gapis achieved by turning the molded innerand outer ring of the seal with the sametool. The very smooth surface achieved bythis turning process is a prerequisite forthe high efficiency the GMN Gap Seal.

GMN

NonContact

Seals

Compact designDimension equal or similar to those ofantifriction bearings or contact seals.

No contactNo wear and no heat caused by the seal.No friction power loss.

Almost unlimited lifeNo costs for maintenance and replacement.

Low cost for mating parts and mountingfitsLarge tolerances allowed for shaft andhousing. Hardening and grinding is notnecessary for customers parts.

Metallic materialAlmost no speed limit applicable attemperatures up to 170 C (340 F)

Plastic material up to 200 mm outerdiameter of the sealResistance against many types ofchemicals, bacteria and fungi. ThereforeGMN Gap Seals are ideal for the FoodProcessing Industry at temperatures up to60 C (140 F).

Independent from sense of rotationNot influenced by reversal of rotation.

High standard sealing efficiency atreasonable costDesign of labyrinth gap and the abovementioned benefits allow the use of GMNNon-Contact Seals even for applicationswhich have been solved with contact sealsor with home designed, expensive, labyrinthprofiles.

GMN Non-Contact Seals can be used forinner ring and/or outer ring rotation.

GMN Non-Contact Seals are supplied tothe manufacturers of the following typesof machines and equipment:

Machine Tool Industry Testing Equipment Packaging Machines Textile Machines Food Processing Machines Driving Units Mechanical Conveying Equipment

ApplicationsMain benefitsGeneral Information


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GeneralInformationaboutLabyrinthSeals

6

Due to technical progress nowadays it isnecessary to find the best solution for everycomponent used on newly designedmachinery to save costs on energy andmaintenance. An important machineelement is the sealing system which hasto fulfil a huge variety of requirements.

Non-Contact Seals could be used for alarge number of applications. Quite oftena special labyrinth seal is too expensive: Itis necessary to manufacture 14 fits to geta seal with only 3 labyrinth steps and veryoften the mounting space of custom madelabyrinth seals is very large.

The GMN Non-Contact Seal has becomefamous for its compact design. Please seethe comparison with standard contact sealsin the table below. The main benefits ofGMN Non-Contact Seals are: Low cost Small mounting space Ease of mounting Reliable sealing against splashing liquids

and granular contaminants.

Sometimes a combination of contact sealand non-contact seal may solve very difficultsealing problems. For example if a gearbox is lubricated with large amounts of oil oil level higher than the sealing diameter and bearings have to be protected againstvery coarse contamination. For this typeof application a GMN Non-Contact Sealcould be used to protect the contact sealand increase the lifetime of the wholesystem.

Comparison of contact seals and Non-Contact Seals

Topic Contact Seal-Lip Seal Non-Contact Seal

Wear sliding friction no wearPower loss friction loss no power loss savings of energy,

smaller driving unitsTemperature see diagram below see diagram belowSpeed limit depending on material High speed limit see diagrams pages 7/8Lifetime depending on wear no limit for the lifeLubrication at sealing location no lubricant necessaryMating parts hardening and grinding necessary for no hardening and grinding necessary for

shafts due to wear the mating partsTemperature limit low caused by material used: Labyrinth Seal: 170 C (340 F)

rubber or plastic Gap Seal: 60 C (140 F)Space requirements small previously: large (custom made labyrinths)

today: small (GMN Non-Contact Seal)To be applied with grease lubrication grease lubrication

oil lubrication oil lubrication(oil level has to be under sealing diameter)

water may cause problems because water Water if corrosion proof material is used andlubrication at the sealing location will increase water level is under the sealing diameter wear will cause no problemsfine or coarse granular contaminants will fine or coarse granular contaminants can be

increase wear. sealed reliably.


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Labyrinth Seals

7


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GMN Labyrinth seals are pressed onto theshaft with a certain press fit. Due to centri-fugal forces the inner ring could lift off ofthe shaft. The diagram below shows thespeed limit depending on the size.

Speed Limit

GMN Labyrinth Seals: Speed Limit

shaft dia d [mm]

rotatingspeed[rpm]

15 25 37 48 58 64 69 75 85 100 120 150 190 222 2700

10.00

20.00

30.00

40.00

50.00

60.00

70.00

8

GMN Labyrinth Seals are complete unitsof two rings with built in labyrinth: The innerring is made of steel the outer ring is madeof aluminium. They are ready for mountingbut inseparable. The profile shows at leastthree labyrinth peaks. Standard modelsare supplied with widths of 10, 15 and20 mm depending on seal diameter. For awide range of applications GMN offers twodifferent designs:

Figure 1

The basic LType against coarse and finegranular contamination and light splashingliquids.

Figure 2

The M-Type against coarseand fine granular contaminationand heavy splashing liquids.

Design

The "M Type seal is designed withperipheral grooves which allow liquidssplashed into the first labyrinth gap to becentrifuged into a circular groove ofcustomers mating part. The liquid may flowback via a drain hole to the reservoir or tothe outside. The correct dimensioning ofthe circular groove and the drain hole is anecessary requirement for high sealingefficiency.

The maximum efficiency of non-contactseals is achieved during rotation. Whenheavy splashing liquids are expected while

machine parts are stationary care shouldbe taken that splashing directly onto theseal does not occur. This could be achievedeasily by a disc or a shield which shouldbe mounted on the shaft. Please see alsopages 14 to 17 for more details andexamples.

The precision of the rings and accuracy ofthe gap are essential for the efficiency of

the seal which could be guaranteed forevery single GMN Labyrinth Seal with aspecial production process.

The catalog information on axial end playSa in the tables refers to the total axialmovement of the seals inner and outerring in relation to each other; from one endposition to the other. Normally the sealshould be installed in flush position - thusthe axial allowance would be half the valuein either direction. Axial and radial clearanceare almost of the same size, and do interfereeach other.

Labyrinth Gap

DesignandPerformanceoftheLabyrin

thSeals

Figure 3

Axial end play

An additional solution for high requirementsof axial clearance can be offered by specialproduced seals with increased end playby factor 1.5. If aggressive of corrosivemediums have to be sealed GMN labyrinthseals could be made from differentmaterials. Please contact our technicalstaff at the earliest stage of your design todiscuss solutions.

Special Designs


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Gap Seals

9


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GMN Gap Seals: Speed Limit

shaft dia [mm]

0

5000

10000

15000

20000

25000

30000

10 16 18 25 28 34 36 38 42 45 50 55 60 65 70 75 80 85 90 100 110 120 138 155

rotatingspeed[rpm]

10

DesignThe GMN Gap Seal is mounted from twoplastic parts, which create a zig zag shapedgap based on a conic envelope, thus thediameter of the sealing gaps are increasedstep by step from e1 on the dry side to e2on the side facing the contaminant. Peaksand valleys of the inner and outer ringsprofiles (turned by the same tool) mergewith each other so that they may besnapped together during the mountingprocess at GMN but are shipped as aninseparable unit.

Material: Polyacetal resin TK AD;Delrin 100

Temperature limits:

40 C to 60 C40 F to 140 F.

Chemical ResistanceThe acetalresin our seals are made of isresistant against a large variety of chemicalsas: the most of the common organicsolvents, alcoholes, esters, ketones,aliphatic and aromatic hydrocarbonats,greases and oils. Alcaloid water and baseeven at higher temperature do not harmthe material.On the other hand this material may not

be used to seal against oxidators andorganic and anorganic acids (pH < 4).

Another advantage of this material is thevery low value of water pickup (max. 0.8%).Detailed information about the resistanceagainst certain chemicals could be foundin the internet in the sectionseals/gap seals/technology: www.gmn.de

Sealing principleThe basic principle of a labyrinth seal isbased on the geometric shape of thelabyrinth which causes some turns of thecontaminant on its way to penetrate theseal. With the GMN Gap Seal the efficiencyof the centrifugal force to accelerate thecontaminant radially to throw it away fromthe sealing gap is increased by the conicenvelope of the labyrinth. To penetrate theseal the contaminant has to overcome thecentrifugal force by creeping from the largerlabyrinth diameter facing the contaminantto the smaller diameter on the dry sideof the seal. Particles penetrating the firststeps of the conic labyrinth are expelledby the centrifugal force and led back to

the side of the seal facing the contaminant.

There is no chance for a Gap Seal to protectagainst higher liquid levels and a pressuregradient between inside and outside of aNon-Contact Seal. Pressure gradients maybe reduced or throttled but not sealed.

The right mounting directionCare should be taken to install the GapSeal the right way the larger labyrinthdiameter has to point to the contaminant.

Axial and radial clearanceThe axial end play refers to the total axialmovement of the seals inner and outerring in relation to each other; from one endposition to the other. Axial and radialclearance of the seal are almost the same approximately 0.5 mm. Both interfereeach other. Normally the seal should beinstalled in flush position thus the axialallowance would be half the value in eitherdirection.

Protection against dustFor this type of requirement the Gap Sealmay be filled with grease before the mount-ing to increase the sealing efficiency againstdusty environment. Please mark your order

pre-greased. A certain amount of thegrease may be moved out

Heavy splashing liquidsThere should be enough free space in frontof the seal to allow free dropping or flowingof the splashing liquid. In addition theSa Type for rotating shafts or theSi Type for rotating housings could beused.

Speed LimitGMN Labyrinth seals are pressed onto the

shaft with a certain press fit. Due to centri-fugal forces the inner ring could lift off ofthe shaft. The diagram below shows thespeed limit depending on the size.

DesignandPerformanceoftheGapSe

als


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Figure 7

11

GMN

NonContact

Seals

The high quality plastic material used forthe standard model of GMN Gap Seals iswell known for its stability and chemicalresistance in a large number of applicationsin the capital goods and consumer goods

industries. Due to its resistance to bacteriaand fungi this material can be used in FoodProcessing and Food Conveying Industries.

Material

Figure 4

This is the basic design which can be usedagainst light splashing of liquids and/or fineor coarse granular contamination. For eitherinner ring rotation or outer ring rotation.

Figure 5

Type kS

This design with a drain at the outer ring

can be used against heavy splashing ofliquids and/or fine or coarse granularcontaminants.For inner ring rotation only!

Figure 6

Type kSa

This design with a drain at the inner ringcan be used against heavy splashing ofliquids and/or fine or coarse granularcontaminants.For outer ring rotation only!

The three drawings shown above areguides for the best choice of GMN GapSeals. The most efficient design dependson whether the shaft of the housing rotates.

Type kSi

One of the prerequisites for the bestperformance of the seal is the correctmounting of the seal. Below we list someguidelines.

Mounting PositionIt is very important that the GMN Gap Sealis mounted correctly. The bigger labyrinthdiameter must be pointing to thecontaminant. If the seal is used for twosealing functions to prevent infiltration ofcontaminants into a unit and to retain thelubricant inside the unit, two GMN GapSeals should be used in opposite directions.

A spacing ring between the two inner ringswould be necessary. Minimum width ofspacing ring is 2 mm.See page 20, figure 21.With thekSa Type and thekSi Type careshould be taken that the built in drain is atthe lowest point of the stationary part ofthe GMN Gap Seal.

Radial ClearanceLoose radial clearance must be avoidedby accurate bearing support. Out ofroundness of shafts and housings have alarge influence on the sealing function they must be kept to a minimum.

Axial ClearanceGMN Gap Seals allow an axial clearanceof .5 mm (.020 inch) in total that means.25 mm (.010 inch) in each direction fromthe flush position of the inner and outerrings of the seal.

Axial WobblingTo prevent axial wobbling of the rotatingring it should be mounted against a

shoulder. The shoulder should be squareto the shaft and be within a close tolerance.

Mounting instructions

On request we will be pleased to suggestand produce special seals for specialapplications, e.g. special dimensions. Forslightly higher temperatures than the limitof 60 C up to 80 C (175 F/194 F) weoffer a special design with O-rings at theinner and/or outer ring to increase thereliability of the press fit. Please contactour technical staff at no obligation.

For some applications the efficiency ofGMN Gap SealkS Type is increased whenfilled with grease. This greasing can bedone at the GMN plant. Please mark yourorder pregreased.

Also state the brand name if a specialgrease is needed depending on yourcontaminant.

Pregreasing is possible for GMN Gap SealkS Type only.

Special customer

oriented seals

The temperature range for using thismaterial covers 40 C (-40 F) and +60 C(140 F).

The chemical resistance includes forexample:alcohols, aldehydes, esters, ethers,hydrocarbons (motor oils, gasoline),agricultural chemicals, weak acids andbases.For extremely high temperatures and/orspeeds the inner ring could be made froma different material (plastic or metallic).


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Fig. 8 Fig. 9

Fig. 10a Fig. 10b Fig. 10c

12

MatingParts

The dimensions of GMN Non-ContactSeals are close to antifriction bearing orcontact seal standards. On request we willproduce seals with special dimensions. Ifin doubt please contact our technical staff.

Contact seals, especially at higher speedsrequire hardening of the shaft as well as ahigh surface finish at the sealing location.With the use of GMN Non-Contact Seals,hardening and grinding of the mating partsis not necessary. Tolerances of the sealhave been designed so that mounting fitsusual for antifriction bearings can beaccepted.

Mating Parts

For GMN Labyrinth Seals:Housing K7Shaft h6

In any event the necessary press fit will beobtained. Additional bonding elementsnormally will not be necessary.

If its necessary to decrease the press fitdue to the design of the whole assembly,fits H7, G7 respectively g6 and f7 canbe used. With these fits industrial gluesfor additional bonding of the GMNLabyrinth Seal onto the shaft and intothe housing should be used. Surface finishRZ 6,3 mm. The outer ring might be0,1 mm wider than the inner ring.

For GMN Gap Seals the followingmounting fits are required:

Housing H7

Shaft h7

Surface finish RZ 6.3 mm

The length l of the chamfered edge of

shaft or housing depends on the width bof the seal. L = 0,1 x b.

Mounting DimensionsThe drawings left are a guide for the designof mating parts. To achieve the best functionof GMN Gap Seals the connecting dia-meters should not exceed minimum ormaximum sizes.

Mounting fits

e2

4

SSa

e1

+2

e1

Si

e2

8

b

0,1xb

510

dh9(h10)

DH8

0,1xbDrain

15

1dh6(j6)

dK7(M7)

115


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Sa

2

Fitting sleeve

shim

13

Method II(Mounting position inside the unit)For assemblies where face mounting is notpossible due to the design, GMN- LabyrinthSeals my be installed the following way,see figures 12a, 12b, 12c.

Fig. 12a

GMN Labyrinth Seal preassembled on theshaft.

Fig. 12b

The shaft is slowly pushed into the bearinghousing. The bearing flange is held in thecorrect position by a split shim of widthSa/2.

Fig. 12c

The shim is removed and the flange is fixedby screws. Now the labyrinth ring is installedin the correct position for operation.

One of the most important requirementsfor the mounting of GMN Labyrinth Sealsis to guarantee wobble free running of theinner ring. Therefore we recommend thatthe inner ring should be pressed againsta solid shoulder of the shaft as shown inthe section Typical Applications seepage 18, figure 14. The shoulder and theshaft must be square and within a closetolerance. Three different methods whichare commonly used for mounting areshown below.

Method I(Face mounting position)For these applications we recommendmounting by a mounting bushing, whichcovers the inner and outer ring, seefigure 4. Due to the fact that both rings arealmost of the same width they will belocated in the working position after mount-ing. The difference of width, 0.1 mm intotal, does not matter for normal appli-cations. The outer ring will be, at maximum,0.1 mm wider than the inner ring.

For high precision units or when axialclearance has to be used totally a recesscould be a machined on the mountingbushing and thus put the two rings intothe position required.

Fig. 11

With the GMN Gap-Seals basically thesame mounting instructions are applicable.

The only difference would be the fact thatboth inner and outer ring are of thesame width.

GMN

NonContact

Seals

Method IIIThis method can be used when neitherface mounting nor preassembly on theshaft is possible, see figures 13a and 13b.

Fig. 13a

GMN Labyrinth Seal preassembled insidethe housing flange.

Fig. 13b

The shaft is slowly pushed into the bearingshousing while the outer ring of the labyrinthseal is held in the right position by a splitshim of high accuracy.

After mounting the shim is removed andboth rings of the seal are in the correctposition.

Mounting Instructions

chamfer

Fitting sleeve

shim removedafter assembly


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b

d

e

D

14

TableofDimensio

nsLabyrinthSeals

For sealing against coarse or fine granularcontaminants and light splashing liquids.

Type L

For sealing against coarse or fine granularcontaminants and heavy splashing liquids.

Type MSimply specify seal type and dimensions.

Special dimensions on request.

Sa = end play in mounted position (totalaxial movement of both rings fromone end position to the other)

15 x 26 x 8 15 26 8 2,5 24 0,3518 x 28 x 10 18 28 10 3 26 0,3820 x 28 x 10 20 28 10 3 26 0,3820 x 30 x 10 20 30 10 3 28 0,3822 x 30 x 10 22 30 10 3 28 0,3825 x 37 x 10 25 37 10 3 34 0,3828 x 39 x 10 28 39 10 3 36 0,3830 x 42 x 10 30 42 10 3 39 0,3832 x 45 x 10 32 45 10 3 42 0,435 x 47 x 10 35 47 10 3 44 0,440 x 52 x 10 40 52 10 3 49 0,442 x 55 x 10 42 55 10 3 52 0,445 x 55 x 10 45 55 10 3 52 0,445 x 62 x 10 45 62 10 3 59 0,448 x 62 x 10 48 62 10 3 59 0,450 x 62 x 10 50 62 10 3 59 0,452 x 68 x 10 52 68 10 3 65 0,455 x 68 x 10 55 68 10 3 65 0,4

58 x 72 x 10 58 72 10 3 68,5 0,460 x 72 x 10 60 72 10 3 68,5 0,460 x 80 x 10 60 80 10 3 76 0,463 x 80 x 10 63 80 10 3 76 0,465 x 80 x 10 65 80 10 3 76 0,465 x 85 x 10 65 85 10 3 81 0,4268 x 85 x 10 68 85 10 3 81 0,4270 x 85 x 10 70 85 10 3 81 0,4270 x 90 x 10 70 90 10 3 86 0,4272 x 90 x 10 72 90 10 3 86 0,4275 x 90 x 10 75 90 10 3 86 0,4280 x 100 x 10 80 100 10 3 95 0,42

90 x 110 x 10 90 110 10 3 105 0,42100 x 120 x 10 100 120 10 3 115 0,42

TypeL M

d D b c e Samm mm mm mm mm mm

Special sizes for spindle noses

Mounting fits:Housing K7Shaft h6See tolerance table page 22.

Remark: Mounting fits H7; G7 respectivelyg6, f7, can be used, but then the GMNLabyrinth Seal should be fixed with specialindustrial glue (e.g. Loctite) into the housingand onto the shaft.

Design and dimensions are subject tochanges.

100 x 120 x 14 100 120 14 4 115 0,7110 x 130 x 15 110 130 15 5 125 0,7120 x 140 x 15 120 140 15 5 135 0,7130 x 150 x 15 130 150 15 5 145 0,7140 x 170 x 15 140 170 15 5 165 0,7150 x 180 x 15 150 180 15 5 175 0,7160 x 190 x 20 160 190 20 5 184,5 0,8170 x 210 x 20 170 210 20 5 204,5 0,8180 x 210 x 20 180 210 20 5 204,5 0,8190 x 230 x 20 190 230 20 5 224,5 0,8200 x 230 x 20 200 230 20 5 224,5 0,8210 x 250 x 22 210 250 22 5 244,5 1,0

69,83 x 85 x 10 69,83 85 10 3 81 0,4288,88 x 108 x 10 88,88 108 10 3 103 0,42

101,60 x 120 x 10 101,60 120 10 3 115 0,42

TypeL M

d D b c e Samm mm mm mm mm mm

b

d

e

D

c


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15

GMN

NonContact

Seals

Simply specify seal type and dimensions.



Sa = 0.5 mm (0.02) for all sizes

Mounting fits see page 12 Tolerance Table page 22.

28 x 62 x 10 28 62 10 46 5728 x 65 x 10 28 65 10 46 5730 x 62 x 10 30 62 10 46 5730 x 65 x 10 30 65 10 46 5730 x 68 x 10 30 68 10 47 6230 x 72 x 10 30 72 10 47 6230 x 75 x 10 30 75 10 47 6232 x 62 x 10 32 62 10 46 5732 x 65 x 10 32 65 10 46 5734 x 62 x 10 34 62 10 46 5734 x 65 x 10 34 65 10 46 5735 x 62 x 10 35 62 10 46 5735 x 65 x 10 35 65 10 46 5735 x 68 x 10 35 68 10 47 6235 x 72 x 10 35 72 10 47 6235 x 75 x 10 35 75 10 47 62

35 x 80 x 10 35 80 10 60 7435 x 85 x 10 35 85 10 60 7435 x 90 x 10 35 90 10 60 7436 x 62 x 10 36 62 10 46 5736 x 65 x 10 36 65 10 46 5736 x 68 x 10 36 68 10 47 6236 x 72 x 10 36 72 10 47 6236 x 75 x 10 36 75 10 47 6237 x 62 x 10 37 62 10 46 5737 x 65 x 10 37 65 10 46 5738 x 62 x 10 38 62 10 46 5738 x 65 x 10 38 65 10 46 57

38 x 68 x 10 38 68 10 47 6238 x 72 x 10 38 72 10 47 6238 x 75 x 10 38 75 10 47 6240 x 62 x 10 40 62 10 46 5740 x 65 x 10 40 65 10 46 5740 x 68 x 10 40 68 10 47 6240 x 72 x 10 40 72 10 47 6240 x 75 x 10 40 75 10 47 6240 x 80 x 10 40 80 10 60 7440 x 85 x 10 40 85 10 60 7440 x 90 x 10 40 90 10 60 74

d D b e1 e2mm mm mm mm mm

TypekS kSa kSi





TypekS kSa kSi

Dimensions

MountingDimensions

e1

d

e2

D

b

e2

4

S

Sa

e1

+2

e1

Si

e2

8


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16

TableofDimensio

nsGapSeals






TypekS kSa kSi





TypekS kSa kSi





Dimensions

MountingDimensions

e1

d

e2

D

b

e2

4

S

Sa

e1

+2

e1

Si

e2

8


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17

GMN

NonContact

Seals




148 x 200 x 15 148 200 15 166 184150 x 190 x 15 150 190 15 166 184150 x 200 x 15 150 200 15 166 184155 x 190 x 15 155 190 15 166 184155 x 200 x 15 155 200 15 166 184160 x 190 x 15 160 190 15 166 184160 x 200 x 15 160 200 15 166 184


TypekS kSa kSi





TypekS kSa kSi





Design and dimensions are subject to changes

Dimensions

MountingDimensions

e1

d

e2

D

b

e2

4

S

Sa

e1

+2

e1

Si

e2

8


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18

TypicalApplications

Two GMN Labyrinth Seals, L Type, of

special design prevent entry of dust andloss of grease.

The spacing ring usually placed betweenthe ball bearing and the fan wheel isintegrated in the seal inner ring.

Thus an economical solution for highvolume production quantities is achieved.

Sealing an electric motor

The application shown in figure 15 requirestwo sealing functions against two differentheavy splashing liquids. The solution is touse two GMN Labyrinth Seals M Type.

One seal is used to prevent penetration ofthe cutting oil from the outside.

Double sealing of a spindle

Sealing the axle of aspecial vehicle

The combined seal shown in figure 16 isjust a proposal, not an economic product.If there is more space a stock item lip sealand a non-contact seal can be used.

Liquid splashed into the first gap is centri-fuged by the peripheral grooves of the M

Type seal into a circular groove of at least5 mm depth.

The cutting oil can flow back to the outsidevia a drain hole. Using the same systemoil lubricant will be led back to the reservoirby the second seal.

Figure 14

Figure 15

Figure 16

The GMN Labyrinth Seal L Type protectsthe lip seal against coarse and fine granularcontamination as well as against heavysplashing water.

If some water penetrates the seal whenthe axle is immersed into water for a shorttime the grease lubricated bearings areprotected by the lip seal.

This combination of contact and non-contact seals increases the life of the entireunit.

5 mm deepannular groove

oil/watermixture

drain hole

lubricatingoil


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19

GMN

NonContact

Seals

Sealing a high frequencygrinding spindle

The GMN Labyrinth Seal L Type has toprotect the high precision bearings againstgrinding chips and lightly splashing liquids.

The excess pressure caused by the oil mistlubrication increases the sealing efficiency.

To protect the seal against splashing liquidswhen the spindle is stationary an additionalfront plate should be used.

Figure 19

Sealing a conveyer roller

The grease lubricated ball bearing of theroller has to be protected against dust andcoarse granular contamination from theoutside.

MountingFor mounting a bushing is used to pushthe seal onto the shaft and into the housingin one operation. To reach wobblefreerunning make sure that the inner ring is

square against the shoulder of the shaft.

Figure 17

Sealing a drilling sleeve

The grease lubricated bearings have to beprotected against cutting oil and chips.Due to the vertical mounting position theflange must be designed correctly becauseit is not possible to protect the inside againstvertical splashing liquids by an uncoverednon-contact seal.

Firgure 18


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20

TypicalApplications

With this application it is absolutelynecessary to use a contact seal to keepthe lubricant inside the gearbox. It isimpossible to use a non-contact seal if thelevel of the lubricant is higher than thesealing diameter.

A GMN Gap Seal is used to protect the lipseal against rough contamination and toincrease the life of the whole sealing system.

Sealing a gearbox withoil-level up to the middleof the shaft

Figure 20

Mounting:There is no axial limitation for the mountingdepth of the GMN Gap Seal. Therefore itis necessary to true the face of the seal tothe face of the housing. The face of thehousing has to be square to the housingbore.

Mountingbushing

Figure 23

Conveyer rollers have to fulfill the samerequirements as transport cylinders.Figure 24 shows a specially designed GMN

Sealing a conveyer roller

Gap SealkS Type protecting greaselubricated antifriction bearings againstsplashing fluids, dirt or dust.

This figure shows an application, wheretwo GMN Gap Seals are used withopposite sealing directions. One is pro-tecting the bearing against penetration ofcoolant and dust. The other one is used

Sealing a spindle bearing(machine tool)

to keep the grease inside the spindle. Toobtain the best sealing function a spacingring on the shaft with at least 2 mm widthshould be used.

Figure 21

To keep the grease inside the unit and toprevent penetration of dust, coarse granularcontamination and light splashing liquids,

two GMN Gap Seals in opposite sealing

Sealing a grease lubricatedantifriction bearing

directions can be used. One facing thelubricant, the other facing the contaminant.

To get the best sealing function a spacing

ring is placed between the two inner rings.

Figure 22


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21

GMN

NonContact

Seals

Figure 26b

Sealing a work spindle

(two different working positions)

A work spindle should be used for twoapplications with minimum change of parts.Only the cover plate and the seal housing

are to change.

Figure 26a

Figure 24

Figure 27a shows an application with thesealing location on the bottom. The coverplate is designed with drain holes forcentrifuging out penetrating liquids.

Figure 27b shows the design of the coverplate without drain holes if heavy splashingliquids are applied to a seal on top of theassembly.

Figure 25

Sealing a spindle bearing(machine tool)

Against heavy splashing coolant the spindlebearing of a machine tool is protected bya GMN Gap SealkSa Type with drain. Toprotect the seal against splashing coolant

while the spindle is stationary a cover platecan be placed in front of the seal.Please allow for a drain hole in the housing.

Sealing an automotivewheel bearing

For this application we recommend a GMNGap SealkS Type filled with grease asadditional sealing to prevent the penetration

by splashing liquids, dirt and dust. Easeof mounting for car repair purposes isachieved by this design.


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Shaft

Shaft Extract of DIN ISO 286-2

Normal size in mm Shaft tolerance in 0.0001 inches (0.001 mm)above 10 18 30 50 80 120 180

to 18 30 50 80 120 180 250

h60 0 0 0 0 0 0

4 (11) 5 (13) 6 ( 16) 7 ( 19) 9 (22) 10 (25) 11 (29)

h70 0 0 0 0 0 0

7 (18) 8 (21) 9 (25) 11 (30) 13 (35) 15 (40) 18 (46)

k6+ 5 (12) + 6 (15) + 7 ( 18) + 8 ( 21) + 10 (25) + 11 (28) + 13 (33)

+ 0 ( 1) + 1 ( 2) + 1 ( 2) + 1 ( 2) + 1 ( 3) + 1 ( 3) + 2 ( 4)

g6additional glueing of the steel 2 ( 6) 3 ( 7) 4 ( 9) 4 ( 10) 5 (12) 6 (14) 5 (15)inner ring necessary 7 (17) 8 (20) 10 ( 25) 11 ( 29) 13 (34) 15 (39) 17 (44)

f7additional glueing of the steel 6 (16) 8 (20) 10 ( 25) 12 ( 30) 14 (36) 17 (43) 20 (50)inner ring necessary 13 (34) 16 (41) 20 ( 50) 24 ( 60) 28 (71) 33 (83) 38 (96)

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ToleranceTable

Housing Extract of DIN ISO 286-2

Normal size in mm Housing tolerance in 0.0001 inches (0.001 mm)above 10 18 30 50 80 120 180

to 18 30 50 80 120 180 250

K7+ 2 ( 6) + 2 ( 6) + 3 ( 7) + 4 ( 9) + 4 (10) + 5 (12) + 5 (13) 5 (12) 6 (15) 7 (18) 8 (21) 10 (25) 11 (28) 13 (33)

M70 0 0 0 0 0 0

7 (18) 8 (21) 10 (25) 12 (30) 14 (35) 16 (40) 18 (46)

N7 2 ( 5) 3 ( 7) 3 ( 8) 3 ( 9) 4 (10) 5 (12) 6 (14)

9 (23) 11 (28) 11 (33) 13 (39) 15 (45) 20 (52) 24 (60)

H7additional glueing of the + 7 (18) + 8 (21) + 10 (25) + 12 (30) + 14 (35) + 16 (40) + 18 (46)aluminium outer ring necessary 0 0 0 0 0 0 0

G7additional glueing of the + 9 (24) + 11 (28) + 13 (34) + 16 (40) + 18 (47) + 21 (54) + 24 (61)aluminium outer ring necessary + 2 ( 6) + 3 ( 7) + 4 ( 9) + 4 (10) + 5 (12) + 6 (14) + 6 (15)

Housing


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More information about our extensive delivery programcould be found in the Internet:

www.gmn.de

On request we produce customer oriented specials in many variations basedon the users requirements. Please contact our technical staff:

Data sheets dxf Files

Inquiry by e-mail

Download area Local representatives Product search

23

GMN

Dichtungen

Paul Mller Industrie GmbH & Co. KGuere Bayreuther Str. 23090411 Nrnberg

E-mail: [email protected]: +49 (0) 911/5691-569Phone: +49 (0) 911/5691-0

Driving Technologie

Contact:Product manager: Herr Karl -417

R & D: Herr Elbacher -414Herr Studtrucker -243

Sales:Wlzlager-Vertriebs GmbH Nrnberg

GeneralvertretungEmmericher Strae 3190411 Nrnberg

Phone: + 49(0) 911/59 776-0Telefax: + 49(0) 911/59 84 313

E-mail: [email protected]: www.waelag.de


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uere Bayreuther Strae 230D-90411 NrnbergPhone: (09 11) 56 91-417

Telefax: (09 11) 56 91-569e-mail: [email protected]: http://www gmn de

Paul Mller IndustrieGmbH & Co. KG

Driving Technology Antriebstechnik

NonContact Sealn

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