Geared Variable-Speed Couplings
Voith Turbo
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Precise control of maximum powers page 2
How will you benefit? page 3
Geared variable-speed couplings page 4
with modular design
Geared variable-speed couplings page 5
for high-speed driven machines
How to select the right coupling page 6
Product range page 9
for high-speed driven machines
Geared variable-speed couplings page 10
for low-speed driven machines
Geared variable-speed couplings
Voith Turbo is the largest manufacturer of geared variable-speed
couplings worldwide. Over 4,000 drives have been supplied so far
and are operating successfully. Powers up to 60,000 kW and speeds
up to 20,000 rpm are possible. Drives with geared variable-speed
couplings are renowned all over the world for their outstanding
features and customer benefits in a wide range of applications,
i.e. in power plants, in the petrochemical industry, the chemical
industry, the iron and steel industry as well as many others.
Precise controlof maximum powers
Economical operation with excellent
reliability is a priority in modern
power plants. Whether they are
installed in boiler feed pump or fan
drives, in thermal power stations, in
combined cycle power plants or
nuclear power plants, Voith geared
variable-speed couplings meet
these requirements, both in the
feed water and in the cooling water
circuit of the power plant.
Controlling the speed of the driven
machine provides accurate and
energy-saving adaptation of power
to the operating point of the plant.
In pump and compressor drives in
chemical and petrochemical indus-
try, the geared variable-speed
couplings ensure that driven
machines operate more economi-
cally. Voith Turbo has the perfect
geared variable-speed coupling for
virtually all requirements – be it the
smooth acceleration of motor and
driven machine or the precise and
dynamic adaptation of the speed of
driven machine.
Offshore or onshore, in extremely
hot or cold temperatures, on plat-
forms, pipeline stations or in the
desert – Voith geared variable-
speed couplings have been de-
signed and built to withstand
rough and extreme conditions,
year after year, with a minimum
of maintenance and maximum
reliability and availability. Designs
to API specifications are available
also.
How will you benefit?
� Power savings and extension of driven machine lifecompared to throttle control; lower operating costs
� Precise load adaptation of driven machines due to the high control accuracy and fast reaction times
� Reliability > 99.9% (Evaluation based on units in operation)
� Vibration damping� Relieved motor start-up and smooth acceleration
of heavy masses� Robust and compact design� Easy maintenance, low maintenance costs� Long service life
2
3
How will you benefit?
Combined with a robust squirrel-
cage motor, geared variable-speed
couplings have proven themselves
as the preferred choice when com-
peting against alternative drive
systems.
Petrochemical industry
Pipeline pumps
Crude-oil pumps
Injection pumps
Pipeline compressors
Process compressors
Applications:
Power plants
Boiler feed pumps
Boiler fans
Circulating pumps
Coal mills
Chemical industry
Compressors
Fans
Centrifugal pumps
4
The modular geared variable-speed
coupling is a further development of
the proven geared variable-speed
coupling design. The gear stage
and the hydrodynamic variable-
speed coupling are provided in a
range of separate modules but with
a common interface so that they
can be combined to provide the
optimum solution for a particular
driven machine power and speed.
Geared variable-speed couplingswith modular design
The advantages of this design
are obvious:
� Increased technical flexibility
� Optimum adaptation by combining
gearbox and coupling
� Integrated rapid-start device
� Compact design, short delivery
times
� Easy maintenance
Scoop tube with electro-hydraulic actuator andmechanically operatedoil circulation control valve– improved dynamics– increased precision– low auxiliary power– compact design– no electro-mechanical
connecting members.
Type R..KM
Voith geared variable-speedcoupling type R..KM
1 Gear stage2 Hydrodynamic variable
speed coupling3 Scoop tube 4 Scoop tube controller
(VEHS)5 Working oil cooler6 Lube oil cooler7 Main lube oil pump8 Oil circulation control
valve9 Working oil pump
10 Auxiliary lube oil pump11 Duplex filter12 Oil tank
Design and function
Voith geared variable-speed cou-
plings combine mechanical gears
and a hydrodynamic variable-speed
turbo coupling in one common
housing. The oil tank is bolted to the
bottom of the housing. Depending
on the application or the design,
the gear stage is either arranged
on the input or on the output side of
the coupling.
The coupling fill can be varied as
needed during operation by means
of the scoop tube. As a result, the
speed and power transmitted to the
driven machine can be controlled
steplessly.
Oil supply
Both working and lube oil are
supplied from the integrated oil
tank, but have separate circuits.
The oil system can also be used
to supply both the motor and the
driven machine with lube oil.
Design
The design of a geared variable-
speed coupling is essentially
determined by the power and the
speed of the driven machine.
Geared variable-speed couplingsfor high-speed driven machines
5
R 11
1 K63
0R
110 K6
30R
19K.
..MR
18 K
...MR
17K.
..MR
16K.
..MR
15K.
..M
R14
K...M
R12
K...M
R 10
K...M
R 120/119 GS
0,3
1
2
3
45
10
20
30
405060
1 2 3 4 5 6 7 8 9 10 15 2
R 8 K...M
R12
0R
119
R11
8R
117
R 119/118 GS
R 118/117 GS R 110/111 KGS
R 18/19 KGS-14
R 16/17 KGS
600
550
500
450
400Po
wer
[kW
x 1
000]
Speed [rpm x 1000]
R 11
1 K 63
0R
110 K6
30R
19K.
..MR
18K.
..MR
17K.
..MR
16K.
..MR
15K.
..M
R 14
K...M
R12
K...M
R 10
K...M
R 120/119 GS
0,3
1
2
3
45
10
20
30
405060
1 2 3 4 5 6 7 8 9 10 15 2
R 8 K...M
R12
0R
119
R 11
8R
117
R 119/118 GS
R 118/117 GS R 110/111 KGS
R 18/19 KGS-14
R 16/17 KGS
600
550
500
450
400
Pow
er [k
W x
100
0]
Speed [rpm x 1000]
Input speed = 1500 rpm (50 Hz countries)
Input speed = 1800 rpm (60 Hz countries)The power diagrams show the
powers transmitted in relation to
the input and output speed for the
various coupling types and sizes.
How to select the right coupling
7
6
R11
1 K63
0R
110 K6
30R
19K.
..MR
18K.
..MR
17K.
..MR
16K.
..MR
15K.
..M
R 14
K...M
R 12
K...M
R10
K...M
R8 K.
..M
R 115 GS
R 11
3R
114
R 11
5
R 115 GSR 114 GS
0,3
1
2
3
45
10
20
30
405060
1 2 3 4 5 6 7 8 9 10 15 2
R 114 GSR 113 GS
R 110/111 KGS
R 18/19 KGS-14
R 16/17 KGS
R 19 GS...M
R 18 GS...M
R 17 GS...M
R 16 GS...M
R 15 GS...M
550
500/450
400Po
wer
[kW
x 1
000]
Speed [rpm x 1000]
R 11
1 K 63
0R
110 K6
30R
19K.
..MR
18K.
..MR
17K.
..MR
16K.
..MR
15K.
..M
R 14
K...M
R12
K...M
R 10
K...M
R 8 K.
..M
R 115 GS
R 11
3R
114
R 11
5
R 115 GSR 114 GS
0,3
1
2
3
45
10
20
30
405060
1 2 3 4 5 6 7 8 9 10 15 2
R 114 GSR 113 GS
R 110/111 KGS
R 18/19 KGS-14
R 16/17 KGS
R 19 GS...M
R 18 GS...M
R 17 GS...M
R 16 GS...M
R 15 GS...M
550
500/450
400
Pow
er [k
W x
100
0]
Speed [rpm x 1000]
Input speed = 3000 rpm (50 Hz countries)
Input speed = 3600 rpm (60 Hz countries)Design to API standard are also
available. The size of the machine
then depends on the specified API
service factor.
IV
I
II
III
100
125
75
50
0
25
0%
10%
20%
30%
40% 50% 60% 70% 80%
1
2
3
4
MK
[%]
50 100
output speed [% of input speed]
100%
Smin
Performance diagramThe performance diagram shows
the transmittable coupling torques
MK at different scoop tube positions
as a function of the output speed.
The desired output speed becomes
a stable intersection between cou-
pling torque MK and load torque
(load curve).
How to operate the coupling
Operating Ranges
I, IV Starting RangeII Control RangeIII Overload Range
The shape of the coupling charac-teristic curves is given for informa-tion only, since there may be minordeviations if coupling sizes, circula-tion oil flows, oil viscosity, etc. vary.
Typical load characteristics
1 constant torque (e.g. positive displacementpumps and compressors).
2 decreasing torque (e.g. boiler feed pumps operating at varying pressures).
3 parabolic torque (e.g. resistance parabolae, pumps with back pressure,blowers).
4 decreasing torque (e.g. boiler feed pumps operating at fixed pressure).
Parameters
Scoop tube position in % of the fullscoop-tube stroke.
MK Transmitted coupling torque
Smin Minimum slip required for torque transmission
S = (1 - ) • 100 [%]
n1 = input speed
n2 = output speed
n2n1
8
9
Coupling types for specific applications depend on the respective
arrangement of gearbox and coupling and the power and the speed
of the motor and the driven machine.
Type R..KM
A combination of step-up gear and
variable speed coupling with high
power density, step-up gearing.
Special advantages due to modular
design.
Type R..KGS
A step-up gear is integrated both
at the input and the output side for
particularly high output speeds,
e.g. for high-speed compressors.
Type R..GS
The coupling is direct-driven by the
motor and adapted to the required
speed of driven machine by the
step-up gear located at the output
side of the coupling; ideal for high
powers and extremely high speeds.
Type R..KGS
Type R..GS
Product range for high-speed driven machines
Design and function
For low-speed driven machines, the
turbo coupling is fitted with a reduc-
tion gear on the output. Coupling
and gear stage are situated in a
common housing, the lower part
of which serves as an oil tank.
By adding a Voith hydrodynamic
brake (optional), with an appropri-
ate breaking torque characteristic,
heavy masses of the driven ma-
chine can be rapidly decelerated.
Oil supply
Both working and lube oil are sup-
plied from the integrated oil tank.
The oil system can also be used
to supply both the motor and the
driven machine with oil.
Geared variable-speed couplings for low-speed driven machines
1 Gear stage2 Hydrodynamic variable
speed coupling3 Scoop tube (adjustable)4 Hydrodynamic brake
(optional)5 Oil supply6 Working oil cooler7 Duplex filter8 Oil pump
6
5
3
1
2
4
7
8
Type R..A
Voith geared variable-speedcoupling type R..A
Type R..B
Type R..A
The variable-speed coupling is
fitted with a helical reduction gear
on the output side. Typical driven
machines are coal mills, crushers,
low-speed pumps and fans.
Type R..B
This type of turbo coupling is fitted
with a bevel gear on the output
side. Geared variable-speed cou-
plings for low-speed driven
machines with high inertia, e.g. coal
mills.
Type R..KGL
A step gear at the input side and
a reduction gear at the output side
make this type into a fast reacting
and compact coupling used e.g. for
fast respones times, loading pumps
and high powers.
10
11
Geared variable-speed coupling type R..B
Type R..KGL
The control requirements of low-speed driven machines such
as coal mills, I.D. fans or crude oil pumps, vary greatly.
Depending on the application and for optimum adaptation to
the existing space conditions, the gear stage is designed as
a helical gear or bevel gear.
Voith Turbo GmbH & Co. KG
Variable speed drives
Voithstraße 1
74564 Crailsheim/Germany
Tel. +49 7951 32-0
Fax +49 7951 32-650
www.variable-speed.com
www.voithturbo.com
cr 2
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