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Voith Turbo Couplings with constant filling

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Applications:

Material Handlingand Conveying– Belt conveyors– Bucket wheel conveyors– Chain and link conveyors– Port loading plants

Mineral Processing Machines– Crushers– Shredders– Mills

Mining – Above & Below Ground– Chain and armoured

conveyors– Tunnelling machines– Bucket wheel excavators– Pumps– Crushers– Mills

Chemical Industry– Centrifuges– Pumps– Fans– Mixers

(In some of the illustrationsthe required guards areremoved to improve visibility.)

As an expert in difficult applications inpower transmission Voith continuesto meet the increasing requirementsthrough innovative product designand performance.

Constant-fill Voith Turbo Couplingsare used with electric motors in awide range of applications, especiallywhen highest powers, economy andreliability are required.

The Voith Turbo Coupling with its in-herent hydrodynamic advantages hasproven itself in millions of applicationsworldwide:

� smooth acceleration of the largestmasses

� suitable for economically pricedsquirrel cage motors

� load free start-up and run-up ofmotor

� no motor modification required� torque control during start-up� effective shock-absorption� overload protection for motor and

machine� load compensation for multi-motor

drives.

Voith-Turbo Couplings –proven a million times

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The Voith Turbo Coupling is a hydro-dynamic coupling based onFoettinger’s Principle. Its main com-ponents are two bladed wheels – apump wheel and a turbine wheel – aswell as an outer shell. Both wheelsare positioned relative to each other.Output is achieved with minimal me-chanical wear as there is no mechani-cal contact between power-transmit-ting parts.

The coupling contains a constantquantity of operating fluid, usuallymineral oil.

The torque transmitted by the drivemotor is converted into kinetic energyof the operating fluid in the pumpwheel to which the motor is connect-ed. In the turbine wheel, this kineticenergy is converted back into me-chanical energy. When it comes tothe function of the coupling, threemodes are to be noted:

Föttingers concept –Design and function

Starting

The pump-wheel acceler-ates the operating fluid asrevolutions in the drive-motor increase, so that acircular flow of fluid iscreated in the workingchamber. The entire blad-ed surface of the turbinewheel is impacted andthus set in motion throughkinetic energy. The torquedevelopment during thestarting procedure is indi-cated by the characteristiccurve of the coupling.

Stationary

All operating fluid inthe coupling is static

Operation at NormalRating

Owing to the minimal dif-ference in speed betweenthe pump and turbinewheel, a constant flow isachieved in the coupling.Only the demand torquefrom the machine is trans-mitted.

Through skillful coordina-tion of compensatingchambers, such as thedelay chamber and the an-nular chamber shell, thestarting performance of theTurbo Coupling can be reg-ulated (see characteristiccurves on page 4).

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A suitable coupling for any drive

Essential performance factors for acoupling are the power and speed ofthe drive motor.

Having established the nominalpower and speed required, the dia-gram on the right enables determina-tion of the appropriate size of thecoupling.

Different conditions require differentstarting procedures (characteristiccurve) for the coupling. Important cri-teria in this respect are the mass mo-ment of inertia, torque limitation andfrequency of start-ups.

In the table below different types ofcouplings and their starting conditionscan be compared.

Typ TTyp TVTyp TVVTyp TVVS

300 400 600 800 1000 2000 3000 4000(50 Hz)600 900 1200 1800 3600(60 Hz)

Silumin hot-quenched[KW]

0,37

0,550,75

1,11,5

2,2345,57,5

1115

2230

455575

110

160200250

400500600800

120016002000

3200

750

Input speed [min-1]

Rat

ed p

ower

inp

ut

Example: Start-up speed 1500 min-1

Rated power 55 kWCoupling size 422

1150

D11

5010

0086

675

0

562

487

422

366

206

D20

615

4 D

154

1500

650

274

D27

4

1

2

0

Motor run-up

Speed

Torq

ue

2

Run-updriven machine

Speed

1,6

1,4

1

Time 5 sec. 40 sec.

Characteristic curves

M/MN

MM

MK

M/MN

MK

M/MN

MK

MM

ML

= motor torqueMM= load torqueML= coupling torqueMK= rated torqueMN

M = const.J = const.

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Turbo Coupling Type T is the basicversion of constant-fill couplings,consisting of pump wheel, turbinewheel and outer shell.

A further range has been created bythe addition of other parts to thisbasic type.

The turbo coupling is normallymounted on the machine shaft orgearbox shaft to be driven (outerwheel drive). In order to compensatefor any slight installation inaccuracies,a flexible connecting coupling is usedto join coupling and input shaft. Op-tional designs are available for mountarrangements which are radially re-moveable without disturbing motorand reducer alignment.

Installation of this type of coupling isrecommended when vibration andoverload protection are required formotor and machine; they may also beused for simpler transmissionsystems in the lower performancerange.

The basic type –Turbo Coupling ”Type T”

Size Type A D L d1 d2 l2 Weight kg1)

max max. max.154 T 80 190 143 32 28 60 4,5154 DT 102 190 165 32 28 80 5,8206 T 97 248 183 42 42 80 11,5206 DT 137 248 223 42 42 115 14,7274 T 135 328 291 65 55 90 23274 DT 175 328 331 65 55 125 30366 T 198 424 357 75 65 120 56422 T 218 470 391 90 80 135 79487 T 246 556 436 100 90 155 122562 T 269 634 490 120 110 170 189650 T 317 740 591 140 120 200 297750 T 366 842 529 140 135 240 431866 T 421 978 610 160 150 265 644

1000 T 441 1118 651 180 160 280 9651150 T 505 1295 715 180 180 320 13371150 DT 830 1295 1040 180 170 550 1677

1) Weight with connecting coupling and max. oil filling.

ød1

L

A

øDød2I2

Applications

– Bucket-wheel equipment– Excavators– Mixing, kneading and stirring

machines

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This version features a ”delay-fillchamber“ which is flange-connectedto the outer wheel of the coupling(Type TV). At stand-still, a proportionof the working fluid lies in this cham-ber, thus reducing the volume in theworking chamber. Hence on motorstart-up, a reduced coupling torque istransmitted, simultaneously providingan unloaded motor start. After themotor has run up, the working fluidflows from the delay-fill chamber intothe working chamber which smoothlyaccelerates the driven machine up toits operating speed.

Furthermore, if the application sodemands, the delay-fill chamber canbe further enlarged (Type TVV), thusenhancing its effects and further re-ducing the coupling torque on motorstart, as well as resulting in evenlonger and smoother start up of thedriven machine.

In certain cases, the function of thedelay chamber can be additionallyimproved through centrifugally con-trolled valves (Type TVF) or throughhydrodynamic refill (Type TVY).

Smoother start up –Turbo Coupling ”Type TV” and ”TVV”

Size Type A D L d1 max. d2 max. l2 Weight kg1)

274 TV 172 328 328 65 55 90 38274 TVV 204 328 360 65 55 90 39274 DTV 244 328 403 65 55 105 45366 TV 225 424 384 75 65 120 61366 TVV 295,5 454,5 75 65 120 64422 TV 257 470 430 90 80 135 88422 TVV 335 508 90 80 135 92487 TV 297 556 487 100 90 155 126487 TVV 382 572 100 90 155 136562 TV 333 634 554 120 110 170 198562 TVV 428 649 120 110 170 206650 TV 384 740 658 140 120 200 307650 TVV 494 768 140 120 200 322750 TV 440 842 603 140 135 240 454750 TVV 567 730 140 135 240 472866 TV 493 978 682 160 150 265 668866 TVV 641 830 160 150 265 696

1000 TV 547 1118 757 180 160 280 9431000 TVV 686 896 180 160 280 9821150 TV 670 1295 880 180 180 320 11801150 TVV 883 1093 180 180 320 1233

1) Weight with connecting coupling and max. oil filling.

Død2ød1 l2

AL

AL

Applications:

– Belt conveyors– Chain conveyors– Centrifuges, decanters– Tube Mills– High-inertia machines

Size Type A D L d1 d2 l2 Weight kg 1)

max. max.422 TVVS 335 470 508 90 80 135 94487 TVVS 382 556 572 100 90 155 145562 TVVS 428 655 649 120 110 170 217650 TVVS 494 756 768 140 120 200 512750 TVVS 567 872 730 140 135 240 436866 TVVS 636 1012 825 160 150 265 772

1) Weight with connecting coupling and max. oil filling.

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A further Voith development is the an-nular-chamber shell additional to theenlarged delay chamber (Type TVVS).

The additional chamber in thecoupling shell enables further reduc-tion of the starting torque. During theinitial rotations of the start-up proce-dure, centrifugal forces cause theouter chamber of the coupling to becompletely filled with operating fluidfrom the bladed area.

In comparison with couplings withoutannular chamber, filling of the bladedarea of a TVVS Coupling is consider-ably reduced, which, in turn, reducesthe torque transmitted during motorrun-up.

The increase in torque then followsthrough gradual emptying of the fluidfrom the delay chamber into the blad-ed area.

The starting procedure can be adapt-ed to the requirements of the applica-tion by adjustable nozzle screws.

This new concept for couplings wasdesigned especially for conveyor beltdrives. Through the gradual build upof torque an automatic adaptation tobelt load conditions is achieved.

The innovative one –Turbo Coupling ”Type TVVS”

ød1

L

A

Dl2 ød2

Application

– Belt conveyors

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The ”v“-belt, timing belt, or flat beltpulley which is flanged to the bearingcover allows various transmission ra-tios to be accommodated. If required,the pulley may be easily exchanged.

TRI and TVRI type Turbo Couplingsare normally installed on the motorshaft in an overhung position. Thebelt force is supported by a bearing inthe bearing cover on the couplinghub.

TRI type Turbo Couplings can be in-stalled both as starting aid and over-load protection. Type TVRI with addi-tional delay chamber is recommend-ed if a particularly smooth start-up isrequired.

For pulley drives –Turbo Coupling ”Type TRI/TVRI”

Size Type A D B dt d Weight kg1)

max. min. max.206 TRI 97 248 70 116 42 9,5206 DTRI 137 248 70 116 42 12,5274 TRI 137 328 100 150 55 25274 TVRI 172 328 100 150 55 28,5274 DTRI 175 328 135 165 60 33274 DTVRI 242 328 135 165 60 38366 TRI 198 424 145 160 65 42366 TVRI 225 424 145 160 65 49422 TRI 205 470 160 182 70 65422 TVRI 257,5 470 160 182 70 71487 TRI 246 556 201 233 90 99487 TVRI 297 556 201 233 90 109562 TRI 269 634 294 265 100 162562 TVRI 333 634 294 265 100 174650 TRI 317 740 – 423 105 228650 TVRI 384 740 – 423 105 246

1) Weight with max. oil filling without pulley.

B

D

A

ød

A

ødt

Applications

– Centrifuges and decanters– Fans– Mixers– Crushers

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MTS mechanical thermal switches

As protection against overheating, fu-sible plugs are standard.

In order to avoid loss of operatingfluid through thermal overload, a me-chanical thermal switch – MTS – canbe added.

On achieving the response tempera-ture, the element activates a pinwhich then operates a switch.

Depending on the type of circuit, thesignal can be used either as an alarmor to switch off the motor.

The circuit element has to be re-placed after activation.

Monitoring devices andaccessories

BTS – Non-contact thermal switch

Monitoring of coupling temperaturestakes place without any contact.After activation of the switch, no re-placement of the element is required.It is ready for use as soon as thecoupling has cooled down.

The signal can be used either as analarm or to switch off the motor.

In some cases BTS can be used asspeed monitor.

Fitting and dismantling tool

Required for professional, safe fittingand dismantling.

As well as the mechanical fitting anddismantling tool, a hydraulic pressuredevice is available.

Sight glass

By fitting a sight glass, the fluid levelin the coupling can be easily checkedwithout opening the coupling.

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In order to provide solutions for anever greater variety of applications,our engineers and technicians havedeveloped additional types of con-stant-fill couplings.

Turbo Coupling with solid shaft andprimary coupling flange

The coupling is fitted rigid to themotor shaft over a primary couplingflange. The weight of the coupling isthus carried by the motor shaft andthe load on the drive shaft is relieved.

An elastic connecting coupling is re-quired between the solid shaft on theoutput side and the driven shaft.

By using a specially designed flexibleconnecting coupling it is possible tofit or dismantle the coupling radiallywithout moving motor or gears.

For special applications –Additional types

Turbo Coupling with brake flange

For use with a breaking system, theturbo coupling can be equipped withan additional brake flange to which abrake-drum or brake-disc is fitted.

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Turbo Coupling with twin circuit“Type DT”

This coupling has two co-axial workcircuits operating in parallel.

By means of a double circuit the out-put of the same size coupling is effec-tively doubled.

The properties, such as starting andoverload protection are comparablewith those of basic Type T withoutdelay chamber.

For available sizes of Turbo CouplingType DT see performance characteri-stic diagram on page 4.

Pulley-type couplingwithout bearing cover Type TRI

This type is ideally suited for particu-larly small belt discs.

The pulley with integral bearing isflanged directly to the coupling shell.

Subsequent replacement of the beltdisc would be costly.

Turbo Coupling with overhungpulley installation – Type TR

In this simplified version of the pulleycoupling, the pulley is fitted to thecoupling shell in an overhung fashion.

Turbo Coupling TR is an economicalsolution for applications in the lowerpower range.

G R O U P O F C O M PA N I E S Cr

128

e

Voith Turbo GmbH & Co. KGStart-up ComponentsP.O. Box 1555D-74555 CrailsheimPhone (079 51) 32-0Fax (079 51) 32-650http://www.voith.deE-Mail: anfahrkomponenten@voith.de

Modern drive concepts demand state-of-the-art technology, hence Voithdrives are present where exacting per-formance is demanded.

Decades of experience in the field ofhydrodynamics, continuous researchand development, state-of-the-art pro-duction technology and the Voithknow-how guarantee the quality of ourproduct and keep it at the fore-front oftechnological development.

Our quality is certified under the codeDIN ISO 9001.

Our engineers with their specializedproduct knowledge are at your dispo-sal to provide the optimum drive solu-tion for your applications.

Marketing companies and sales agen-cies in every continent ensure closecontact with our customers and guar-antee rapid service.

ESPRIT, EXCELLENCE and EFFIZIENZtogether symbolize the factors throughwhich concepts are born and productscreated within the Voith Group.

ESPRIT – researching and developingin the service of the customer.

EXCELLENCE – staying ahead of thefield.

EFFIZIENZ – transforming individualachievement into corporate success.For our customers. For our staff. Forour company.

Competence inhydrodynamic drivetechnology