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Tailored Solutions for
MARINE PROPULSION
Arrangements
• Single-In Single-Out epicyclic and parallel shaft units
• Double In, Single Out arrangements for gas turbine, diesel and
electric drive
• Special arrangements connecting shaft-lines
Our main areas of activity are:
• Fast Patrol Vessels
• Fast Luxury Yachts
• Naval and Commercial Hovercraft
• OPV’s
• Corvettes
• Frigates
Allen Gears works with all classification societies including DNV,ABS,
Lloyds, Germanischer Lloyd,AGMA, RiNa and NKK.
Over the last 50 years Allen Gears has supplied morethan 1350 main propulsion gear systems to the naval andcommercial marine sectors. Every unit is bespoke;designed to meet each customers specific design criteria exactly.Installations include:
• Fast Patrol Vessels for various world navies including British, German, Swedish, Malaysian and Norwegian
• Luxury yachts utilising complex systems demanding high speed, weight optimised solutions
• 980 epicyclic gear sets for Merchant Marine Installations, including a range of Very Large Crude Carriers (VLCC)unriv
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The Shergar Gearbox configuration is TISO ‘C’ drive arrangement.
The primary reducers are 2 x epicyclics each driving onto a parallel shaft gear
via a quill shaft and an SSS clutch.
Allen Gears prides itself in producing
tailored transmission systems that
address our customers key design
drivers in full. For each project we
supply unique solutions, designed to
operate with the utmost reliability.
Tailored marine propulsion solutions
SHERGAR HIGH SPEED LUXURY YACHT
‘Shergar’ high speed luxury yacht, built for the Aga Khan.The yacht is a
46m monohull with a maximum rated speed of 45 knots.The waterjets
are propelled by two Allison 570 gas turbines with a total installed power
of 10,800 kW.
Over the years,Allen Gears has
gained the respect and confidence
of the discerning marine propulsion
market with great strength in
critical areas;
• Application Expertise
• Flexibility
• Innovation.
Application ExpertiseThis is the foundation of our marine propulsion business. For
over 50 years, Allen Gears has been solving its customers
design problems, often minimising the weight and
installation space of its transmissions beyond the ability of
its competitors.
We have the confidence to approach the boundaries of engineering limits, while
still ensuring the ultimate in reliability.This is a result of intimate application
knowledge and successful installations over many years.
BASS TRADER (ghosted image)
1960.The Australian National Line transport ferry
Bass Trader , a twin screw ship of 1850 tonnes
dead weight. Powered by high speed diesel
engines through two double reduction epicyclic
units.The epicyclic gear allowed for a more
compact engine room design.
1966. Sea Swan, a 255,350 tonne deadweight
VLCC powered by Stal Laval turbine propulsion
system utilising Allen epicyclic gearing. One of 980
gear sets supplied for this vessel type.
1996. Main gas turbine gearbox for KNM Skjold fast
attack vessel for Norwegian Navy.Two x Allison 571
gas turbines driving through gearbox in C drive
configuration.Total installed gas turbine power
6,000 kW.
1978 triple reduction epicyclic main propulsion
gear for the Handymax 43,000 tonne dead
weight, gas turbine powered bulk carrier Iron
Carpentaria . Built by the Whyalla Shipbuilding &
Engineering Works of Australia, for the Broken
Hill Proprietary Co Ltd (BHP).
1988. Propulsion fan drives for Republic of South
Korea Navy, LSFI hovercraft programme.
Gearbox weight is minimised to 990kg per unit,
each gearbox powered by a 2200kW Textron
Lycoming TF40 Gas Turbine. Maximum speed 60
knots.Allen Gears also supplied lift fan gearboxes
for this contract.
FlexibilityFor each new project we have no preconception or preference for any particular engineering solution.
In the early stages, only our customers design issues are important and we are at their disposal to
optimise engine, propulsor and machinery layout to guarantee that vessel performance is optimised.
Flexibility to enable the most powerdense machinery layout whilstachieving desired shaft centres
Where the optimum machinery layout calls for large centre
distances between drivers, whilst minimising gearbox weight
and dimension,Allen Gears will offer a tailored solution that
achieves both aims.
Flexibility to enable co-axial machinery layouts
Where a co-axial arrangement of engine and driven shaft is the
customer’s optimum layout, the most complimentary gearbox
configuration is likely to be epicyclic.These offer the most power
dense solution where a single-in, single-out gearbox is required.
Flexibility to enable any machineryorientationAllen Gears will design the drive train and casing
to ensure that the driving machinery, the driven machinery
and surrounding structures can be positioned as desired.
Allen Gears is a world leader in the
production of epicyclic gearboxes,
proud of its record in the Marine
and Powergen industries.
In this arrangement, the desired centre
distance between Rolls-Royce MT30
and diesel engine is achieved, the gear
train incorporating an epicyclic
module at the output, to minimise
total gearbox weight.Total weight for
this configuration is 66 tonnes.
The customer s need for offset
inputs is addressed by this tailored
casing for a 23 tonne CODAD
gearbox that permits the diesels to
be mounted opposite each other and
at different elevations
Utilising our vast experience and
expertise in the application of all types
of gearing systems,Allen Gears will find
a combination that enables
employment of the desired
machinery drive train.
Innovation
Not only do we enable the use of your preferred drive train technology,
by being flexible with regard to gearbox design. We will also go one
significant
step further, to optimise the gear design for the specific project.
Allen Gears is skilled in addressing customers’ key gearbox design criteria.
Our track record of providing bespoke, power dense solutions, provides
some excellent examples of innovation at work;The challenge on Millennium 140 was to keep
weight to a minimum and to minimise both
the horizontal offset between the gas turbines
and the gearbox width.
The solution was a special COGAG design that
addressed the customer s dimensional
restraints by;
• Utilising low diameter epicyclic units
immediately after the gas turbines.
• Mounting these units at an angle, to
minimise horizontal offset
Each epicyclic unit drives (via quill shaft and SSS clutch)
a single helical pinion.The lower pinion drives direct onto
the final gearbox bull gear driving the waterjet. Power
from the upper gas turbine is applied via the lower pinion
and an intermediate wheel.This arrangement permitted
the customer to install the gas turbines exactly in their
desired position. SSS clutches allow the use of either or
both gas turbines.
Epicyclic modules with a
ratio of 4.0:1 replace a
parallel shaft gearbox
section, which would weigh
double and significantly
impact installation
dimension.
Special casing design
enables most desirable
gas turbine siting
Electron beam welded
gears reduce gear weight
by up to 50% compared
to conventional gearing
Aluminium gearcase
reduces gearcase weight
by up to 60% whilst
maintaining the same
integrity
Electron Beam Welding is applied in the construction
of geared rotors and shafts to produce an extremely
power dense solution. Allen Gears has worked closely
with leading aerospace companies to develop designs
and welding processes that ensure a robust and reliable
product. The result is components weighing as
much as 50% less
than alternative light weight marine solution.
Electron Beam Welding Technology
MILLENNIUM 140
THE WORLD IS NOT ENOUGH
LUXURY YACHT
Allen Gears provided the speed boosting
gas turbine propulsion gear for this 140’
vessel.The vessel was built to achieve 70
knots and break the world superyacht
speed record.
The Visby Class corvettes for the
Swedish Navy are 73m vessels, with
600 tons full displacement and a
speed of 15 knots long distance and
35 knots short distance.
The propulsion system consists of
2 x CODOG units in a C drive
configuration.
Electron Beam Welding allows precision gearwheels to be constructed
from thinner section gear rims, side plates and shafts without generating
the high levels of distortion prevalent with other welding practices.
• Electron beam welding does not use filler material
• Only parent material is utilised, providing a high levelof weld integrity and strength properties
• Only highly localised heating is applied, minimising distortion.
Section through electron
beam welded gear
Allen Gears Limited
Atlas Works
Pershore
Worcestershire WRI0 2BZ
United Kingdom
T. +44 (0)1386 552211
F. +44 (0)1386 554491
E. sales@allengears.com
allengears.com
Created by Lassoo: 01386 555252
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