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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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gearbox inspections, overhauls, repairs,

refurbishments and upgrades.

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