Voith Turbo

Voith Turbo Fluid Couplings with Constant Fill

Voith – Our Company.Voith is the reliable partner for essential industries. We set standards

around the world in our markets for paper, energy, mobility and service.

With annual sales over € 4 billion and more than 37,000 employees in

nearly 300 locations worldwide, Voith is one of the large family-owned

companies in Europe.

Markets

Our equipment, components and services allow

us to make a major contribution towards our

customers’ success. The global demand for

paper, energy, mobility and services will continue

to grow in the coming years. We will be there to

watch these markets of the future develop, and

will play our part in shaping them.

Customers

Everything we do is centered around the needs

of our customers. Our global presence and

proximity to our customers allow us to create a

working relationship based on confi dence and

trust. We want to draw on our engineering skills,

our inno vative strength and our solidity in order

to be a reliable partner for generations to come.

Paper ServiceEnergy Mobility

2

Quality, reliability and sound-

ness are the key concepts of

our identity.

These are expressed in:

Voith – Engineered reliability.

We Are Shaping the Future

People at Voith have written and re-written tech-

nical history with their ideas and developments.

Today, our products set standards around the

world. Our engineers will continue to shape the

future actively in our markets, for the benefi t of

our customers and the long-term success of our

company.

Voith Turbo Fluid Couplings – proven a million times

The Voith fluid coupling with its in-

herent hydrodynamic advantages

has proved itself by millions of sales

worldwide:

n smoothest acceleration of the

largest massesn suitable for economically priced

squirrel cage motors n load free start-up and run-up of

the motorn no motor modification requiredn torque limitation during start-upn effective shock-dampeningn overload protection for motor and

driven machinen load compensation for multi-

motor drives.

As an expert for difficult tasks in power transmission Voith Turbo

meets the steadily increasing requirements in practice and con-

vinces through innovative performance.

Constant-fill Voith fluid couplings are used with electric motors

in a wide range of applications, especially when highest powers,

economy and reliability are required.

3

4

Applications:

Material Handling and

Conveying

n Belt conveyorsn Bucket wheel elevatorsn Chain conveyors n Stackers and reclaimersn Port loading facilities

Mineral Processing Machines

n Crushersn Shreddersn Mills

Mining –

Open-pit and Underground

n Armoured face conveyorsn Stage loadersn Belt conveyorsn Tunnelling machinesn Bucket wheel excavatorsn Pumpsn Crushersn Mills

Chemical

Industry

n Centrifugesn Pumpsn Fansn Mixers

5

Foettinger’s concept – Design and function

The coupling operates on a con-

stant quantity of operating fluid,

usually mineral oil. On demand,

design for water is available.

The torque transmitted by the drive

motor is converted into kinetic en-

ergy of the operating fluid in the

pump wheel to which the motor is

con nected. In the turbine wheel, this

kinetic energy is converted back

into mechanical energy. Three

operating modes are defined:

Nominal operation

The low speed difference between

pump and turbine wheel (the so-

called nominal slip) leads to the flow

condition in the coupling becoming

stationary. Only the torque required

by the driven machine is transmit-

ted.

wheel and sets the latter in motion.

The torque development is deter-

mined by the characteristic curve of

the coupling, while the start-up

characteristics are influenced by an

appropriate arrangement of com-

pensating chambers (delay cham-

ber, annular chamber).

Standstill

The entire operating fluid in the

coupling is at rest.

Start-up

With increasing speed, the oper-

ating fluid in the working circuit is

accelerated via the pump wheel.

The circulatory flow created in this

way is supported by the turbine

The Voith Turbo Coupling is a hydrodynamic coupling based on

Foettinger’s Principle. Its main components are two bladed wheels –

a pump wheel and a turbine wheel – as well as an outer shell. Both

wheels are positioned relative to each other. Power transmission is

achieved with minimal mechanical wear and there is no mechanical

contact between the power-transmitting components.

Standstill Start-up Nominal Operation

6

Essential design factors for a fluid

coupling are the power and motor

speed. Having established the nom-

inal power and speed required, the

diagram on the right enables deter-

mination of the appropriate size of

the coupling.

Different conditions require different

starting procedures (characteristic

curve) for the coupling. Important

criteria in this respect are the mass

moment of inertia, torque limitation

and frequency of start-ups.

A suitable coupling for any drive

In the table beside different types of couplings’ starting behaviour can be compared.

Type T Type TV Type TVV Type TVVS

TM: motor torqueTL: load torqueTK: coupling torqueTN: rated torqueJ: moment of inertia

40003200

1600

800

400

250

16011075

18.511

5.5

3

1.5

0.75

0.37

300 400 600 800 1000 1500 2000 3000

0.5

1

2345

101520304050

100

200300400500

100015002000300040005000

3600

3000

1800

1500

1200

1000

900

750

2000

1200

600

200

315 1150

D11

5010

0086

675

065

056

248

742

236

6

206 D

206

154 D

154

274 D

274

4000

3730

55

22

7.5

4

2.2

1.1

1

2

0

T/TN

TM

TK

2

1.6

1.41

T/TN

TK

5 s 40 s

T/TN

TK

TM

TL1

2

0

T/TN

TM

TK

2

1.6

1.41

T/TN

TK

5 s 40 s

T/TN

TK

TM

TL1

2

0

T/TN

TM

TK

2

1.6

1.41

T/TN

TK

5 s 40 s

T/TN

TK

TM

TL

Characteristic curves

Speed Speed Time

Torque/Time behaviour

TL = const.J = const.

Run-updriven machine

Motor run-up

Example:Rated power: 55 kWInput speed: 1500 rpmCoupling size: 422 Input speed n1 [rpm]

Inpu

t pow

er P

1 [kW

]

Inpu

t pow

er P

1 [H

P]

Torq

ue

Torq

ue

Torq

ue

Size Type A D L d1 max. d2 max. l2 max. Weight1)

[mm] [kg]Type T

Type DT

154

154

206

206

274

274

366

422

487

562

650

750

866

1000

1150

1150

T

DT

T

DT

T

DT

T

T

T

T

T

T

T

T

T

DT

80

102

97

137

135

175

198

218

246

269

317

366

421

441

505

830

190

190

248

248

328

328

424

470

556

634

740

846

978

1118

1295

1295

143

165

183

223

294

334

357

391

436

490

591

529

610

651

715

1040

32

32

42

42

75

75

75

90

100

120

140

140

160

180

180

180

28

28

42

42

55

55

65

80

90

110

120

135

150

160

180

170

60

80

80

114

90

125

120

135

155

170

200

240

265

280

320

350

4

5

10

13.4

32

37

52

78

110

170

259

356

567

850

1165

1806

7

The basic type – Fluid coupling type T and DT

ød1

L

A

øDød

2

I2

Turbo Coupling Type T is the basic

ver sion of constant-fill couplings,

con sist ing of pump wheel, turbine

wheel and outer shell.

A further range has been created by

the addition of other parts to this

basic type.

The fluid coupling is normally

mounted on the machine shaft or

gearbox shaft to be driven (outer

wheel drive). In order to compen-

sate for any slight installation in-

accuracies, a flexible connecting

coupling is used to join the coupling

and input shaft.

Use of this type of fluid coupling is

recommended when vibration

damping and overload protection

are required for motor and driven

machine; they may also be used for

simpler transmission systems in the

lower performance range.

The coupling Type DT has two

coaxial work circuits operating in

parallel. By means of a double

circuit the output of the same size

coupling is effectively doubled.

Applications:n Bucket-wheel excavatorsn Bucket-wheel elevatorsn Mixing, kneading and stirring

machines

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

8

Smoother start up – Fluid coupling type TV and TVV

Død

2

ød

1

l2

AL

AL

The TV version features a ”delay-fill

chamber“ which is flange-connected

to the outer wheel of the coupling.

At stand-still, a proportion of the

working fluid lies in this chamber,

thus reducing the volume in the

working circuit. Hence on motor

start-up, a reduced coupling torque

is transmitted, whilst simultaneously

providing an unloaded motor start.

After the motor has run up, the

working fluid flows from the delay-fill

chamber into the working circuit

which smoothly accelerates the

driven machine up to its operating

speed.

Furthermore, if the application so

de mands, the delay-fill chamber

can be further enlarged (type TVV),

thus enhancing its effects and fur-

ther reducing the coupling torque on

motor start, as well as resulting in

even longer and smoother start-up

of the driven machine.

In certain cases, the function of the

delay chamber can be additionally

improved through centrifugally con-

trolled valves (type TVF) or through

hydrodynamic refill (type TVY).

Applications:n Belt conveyorsn Centrifuges, decantersn Tube millsn High-inertia machinesn Crushers

Size Type A D L d1 max. d2 max. l2 max. Weight1)

[mm] [kg]

274 274 274 366 366 422 422 487 487 562 562 650 650 750 750 866 866 1000 1000 1150 1150

TVTVVDTVTVTVVTVTVVTVTVVTVTVVTVTVVTVTVVTVTVVTVTVVTVTVV

172204244225296257335297382333428384494440567493641547686670883

328 328 328 424 424 470 470 556 556 634 634 740 740 846 846 978 978 1118 1118 1295 1295

331 315 355 384 455 430 508 487 572 554 649 658 768 603 730 682 830 757 896 880 1093

75 65 65 75 75 90 90 100 100 120 120 140 140 140 140 160 160 180 180 180 180

55 55 55 65 65 80 80 90 90 110 110 120 120 135 135 150 150 160 160 180 180

90 90 125 120 120 135 135 155 155 170 170 200 200 240 240 265 265 280 280 320 320

32 33 38 56 58 80 83 111 119 172 182 259 274 364 386 570 595 870 905 1242 1334

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

Type TV

Type TVV

9

The innovative one – Fluid coupling type TVVS

ød

1

L

A

Dl2 ød

2

The TVVS is a further Voith devel-

opment in cooperating an annular-

chamber shell in addition to the en-

larged delay chamber.

The additional chamber in the coup-

ling shell enables further reduction

of the starting torque. During the ini-

tial rotations of the start-up proced-

ure, centrifugal forces normally

cause the outer chamber of the

coupling to be completely filled with

operating fluid from the working

circuit.

In comparison with couplings with-

out annular chamber, filling of the

working circuit of a TVVS coupling

is considerably reduced, which, in

turn, lessens the torque transmitted

during motor run-up.

The increase in torque then follows

a gradual emptying of the fluid from

the delay chamber into the working

circuit.

The starting procedure can be

adapted to the requirements of the

application by adjustable nozzle

screws diameters.

This new con cept for couplings was

designed originally for conveyor belt

drives. Through the gradual build up

of torque an automatic adaptation to

belt load conditions is achieved.

Applications:n Belt conveyorsn High-inertia machines

Size Type A D L d1 max. d2 max. l2 max. Weight1)

[mm] [kg]

422

487

562

650

750

866

TVVS

TVVS

TVVS

TVVS

TVVS

TVVS

335

382

428

494

567

641

470

556

660

761

877

1017

508

572

649

768

730

830

90

100

120

140

140

160

80

90

110

120

135

150

135

155

170

200

240

265

87

126

192

291

404

645

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

Type TVVS

10

For pulley drives – Fluid coupling type TRI and TVRI

B

D

A

ød

A

ød

t

The V-belt or flat belt pulley which

is mounted to the bearing cover

allows various transmission ratios to

be accommo dated. If required, the

pulley may be easily changed.

TRI and TVRI type fluid couplings

are normally installed on the motor

shaft in an overhung position. The

belt force is supported by a bearing

in the bearing cover on the coupling

hub.

TRI couplings can be installed both

as start-up device and overload pro-

tection. Type TVRI with additional

delay chamber is recommended if a

particularly smooth start-up is re-

quired.

Applications:n Centrifuges, decantersn Fansn Mixersn Crushers

Size Type A D B max. dt min. d max. Weight1)

[mm] [kg]

206

206

274

274

274

274

366

366

422

422

487

487

562

562

650

650

TRI

DTRI

TRI

TVRI

DTRI

DTVRI

TRI

TVRI

TRI

TVRI

TRI

TVRI

TRI

TVRI

TRI

TVRI

97

137

137

172

175

242

198

225

205

258

246

297

269

333

317

384

248

248

328

328

328

328

424

424

470

470

556

556

634

634

740

740

70

70

100

100

135

135

145

145

160

160

201

201

294

294

–

–

116

116

150

150

165

165

160

160

182

182

233

233

265

265

423

423

42

42

55

55

60

60

65

65

70

70

90

90

100

100

105

105

9

12

25

26

33

38

47

51

74

76

110

112

173

175

256

261

1) Weight with max. oil filling without pulley.

Type TRI

Type TVRI

11

Monitoring devices and accessories

MTS

Mechanical thermal switch

As protection against overheating,

fusible plugs are a standard feature.

In order to avoid loss of operating

fluid through thermal overload, a

mechanical thermal switch (MTS)

can be added. On achieving the re-

sponse temperature, the element

activates a pin which then operates

a switch. Depending on the type of

circuit, the signal can be used either

as an alarm or to switch off the

motor.

The circuit element has to be re-

placed after activation.

Mounting and removal device

Required for professional, safe in-

stallation and removal.

As well as the mechanical tool, a

hydraulic removal tool is available.

Sight glass

By fitting a sight glass, the fluid

level in the coupling can be easily

checked without opening the

coupling.

BTS

Non-contact thermal switch

Monitoring of coupling temperatures

takes place without any contact.

After activation of the switch, no re-

placement of the element is re-

quired. It is ready for use as soon

as the coupling has cooled down.

The signal can be used either as an

alarm or to switch off the motor.

12

For special applications – Additional types

Fluid coupling with

multi-disc coupling (GPK)

The design of motor and drive unit

is becoming more and more com-

pact without affecting the actual

performance of the drive. This con-

sequently leads to smaller diam-

eters of motor and gearbox shafts

which then suffer from reduced load

capacity. For such cases the weight

oft the turbo coupling is distributed

to both the driving and the driven

shaft via two discpack couplings.

The reduced load on shaft and

bearings contributes significantly to

an extended service life of bearings.

In order to provide solutions for an ever greater variety of

applications, our engineers and technicians have developed

additional types of constant-fill couplings.

Fluid coupling with

solid shaft and primary

coupling flange

The coupling is fitted rigid to the

motor shaft over a primary coupling

flange. The weight of the coupling is

thus carried by the motor shaft and

the load on the driven shaft is re-

lieved.

An elastic connecting coupling is re-

quired between the solid shaft on

the output side and the driven shaft.

By using a specially designed flex-

ible connecting coupling it is pos-

sible to fit or dismantle the coupling

radially without moving motor or

gears.

Fluid coupling with

brake flange

For use with a braking system, the

fluid coupling can be equipped with

an additional brake flange to which

a brake-drum or brake-disc can be

mounted.

13

Fluid coupling with

water as operating medium –

Type TWV...

Voith Fluid coupling – designed for

operating fluid water – can be used

in such cases, where mineral oil is

restricted of savety and ecological

reasons.

Especially in underground coal

mining the water type couplings are

preferred.

Higher power transmissions on

account of this medium is also

given.

Pulley-type coupling without

bearing cover – Type TRI/TVRI

This type is ideally suited for par-

ticularly small pulley diameters.

The pulley with integral bearing is

flanged directly to the coupling

shell.

Replacement of the belt pulley is

suggested to be done at the Voith

factory.

Fluid coupling with

overhung pulley installation –

Type TR

In this simplified version of the pul-

ley coupling, the pulley is fitted to

the coupling shell in an unsupported

version.

Fluid coupling type TR is an eco-

nomical solution for applications in

the lower power range.

cr12

8en,

SS

vG-a

ik, 0

2.20

08, 0

. Dim

ensi

ons

and

illus

trat

ions

with

out o

blig

atio

n. S

ubje

ct to

mod

ifica

tions

.

Voith Turbo GmbH & Co. KG

Startup Components

Voithstr. 1

74564 Crailsheim, Germany

Tel. +49 7951 32-409

Fax +49 7951 32-480

startup.components@voith.com

www.voithturbo.com/startup-components