AAM Marine Thrusters

RETRACTABLE THRUSTERS

An azimuth thruster is a configuration of marine propellers placed in pods that can be rotated to any horizontal angle (azimuth), making a rudder unnecessary. These give ships better maneuverability than a fixed propeller and rudder system.

Types of azimuth thrusters

There are two major variants, based on the location of the motor:

 

 1. Mechanical transmission, which connects a motor inside the ship to the outboard unit by gearing. The motor may be diesel or diesel-electric. Depending on the shaft arrangement, mechanical azimuth thrusters are divided into L-drive and Z-drive. An L-drive thruster has a vertical input shaft and a horizontal output shaft with one right-angle gear. A Z-drive thruster has a horizontal input shaft, a vertical shaft in the rotating column and a horizontal output shaft, with two right-angle gears.

 2. Electrical transmission, more commonly called pods, where an electric motor is fitted in the pod itself, connected directly to the propeller without gears. The electricity is produced by an onboard engine, usually diesel or gas turbine.

DECK MOUNTED AZIMUTH THRUSTER

A Z-drive is a type of marine propulsion unit. Specifically, it is an azimuth thruster. The pod can rotate 360 degrees allowing for rapid changes in thrust direction and thus vessel direction. This eliminates the need for a conventional rudder. The Z-drive is so named because of the appearance (in cross section) of the mechanical driveshaft or transmission configuration used to connect the mechanically supplied driving energy to the Z-Drive azimuth thruster device.

 

This form of power transmission is called a Z-drive because the rotary motion has to make two right angle turns, thus resembling the letter “Z”. This name is used to differentiate the arrangement of drive to that of the L-drive. It does not refer to an electric motor in a rotating pod.

CONTRA ROTATING PROPELLER TUNNEL THRUSTER

Maneuvering thruster (bow thruster or stern thruster) is a transversal propulsion device built into, or mounted to, either the bow or stern, of a ship or boat to make it more manoeuvrable. Bow thrusters make docking easier, since they allow the captain to turn the vessel to port or starboard side, without using the main propulsion mechanism which requires some forward motion for turning; The effectiveness of a thruster is curtailed by any forward motion due to the Coandă effect.

 

A stern thruster is of the same principle, fitted at the stern. Large ships might have multiple bow thrusters and stern thrusters.

Large vessels usually have one or more tunnel thrusters built into the bow, below the waterline. An impeller in the tunnel can create thrust in either direction that makes the ship turn. Most tunnel thrusters are driven by electric motors, but some are hydraulically powered. These bow thrusters, also known as tunnel thrusters, may allow the ship to dock without the assistance of tugboats, saving the costs of such service.

 

Ships equipped with tunnel thrusters typically have a sign marked above the waterline over each thruster on both sides, as a big cross in a red circle: (x). Tunnel thrusters increase the vessel’s resistance to forward motion through the water, but this can be mitigated through proper fairing aft of the tunnel aperture. Ship operators should take care to prevent fouling of the tunnel and impeller, either through use of a protective grate or by cleaning. During vessel design, it is important to determine whether tunnel emergence above the water surface is commonplace in heavy seas.

CONTROLLABLE PITCH PROPELELR TUNNEL THRUSTER

Mechanical azimuth thrusters can be fixed installed, retractable or underwater-mountable. They may have fixed pitch propellers or controllable pitch propellers. Fixed installed thrusters are used for tugboats, ferries and supply-boats. Retractable thrusters are used as auxiliary propulsion for dynamically positioned vessels and take-home propulsion for military vessels. Underwater-mountable thrusters are used as dynamic positioning propulsion for very large vessels such as semi-submersible drilling rigs and drillships.

FIXED PITCH PROPELELR TUNNEL THRUSTER

Mechanical azimuth thrusters can be fixed installed, retractable or underwater-mountable. They may have fixed pitch propellers or controllable pitch propellers. Fixed installed thrusters are used for tugboats, ferries and supply-boats. Retractable thrusters are used as auxiliary propulsion for dynamically positioned vessels and take-home propulsion for military vessels. Underwater-mountable thrusters are used as dynamic positioning propulsion for very large vessels such as semi-submersible drilling rigs and drillships.

CONTROLS 

DECK MOUNTED AZIMUTH THRUSTER:

 –  Bridge Control Panel

 –  Central Control Box

 –  Local Control Panel

 –  Local Control Box

  – Proportional Valves for Steering, Lifting and Tilting

 

 

 

Hydraulic Unit (CPP Tunnel Thruster) includes: Oil Tank, Hydraulic Pump and Valves

 

Remote Control System Including motor starter, E-Motor, Control Panel, Central Control Box

Share on facebook
Share on linkedin
Share on email
Share on print

AAM Marine Shafts

Propeller Stern Shaft

The stern shaft materials have passed EN10204-3.1 certification, covering various grades of: low carbon steel, alloy steel, stainless steel, ductile iron, aluminum alloy, copper alloy, titanium alloy. The main processes are: free forging, die forging, rolling ring, high pressure casting, centrifugal casting, normalizing, quenching and tempering, solution treatment, aging treatment, carbonitriding, turning, milling, drilling, grinding, high frequency quenching, galvanizing, chrome plating, anodizing, powder spraying and other processes.

We can produce propeller shafts with:

A max length of16000mm, max diameter 500mm and max single piece weight 16 Tons. At the same time, we are good at terminal machining of complex products, dimension accuracy: Min 0.01mm, roughness: Min Ra0.6.

Shafting System Hydraulic Coupling

The shaft coupling is the component which joins the propeller shaft to the gearbox output flange. Some are bolted directly to the gearbox but many installers use a flexible couple, such as R&D flexible couplings, which would then bolt to the gearbox. Our range includes couplings for most popular transmission types, bored for imperial or metric shafts.
Besides the standard coupling, the Solid Half Coupling, Clamp on or Split Half Coupling, Bobbin Coupling and Coupling Adapters are also available.

Share on facebook
Share on linkedin
Share on email
Share on print

AAM Marine Shaft Sealing

MARINE SHAFT SEALING

WATER LUBRICATED

HOLLEX SEAL

The  Hollex  seal  has  a  new  design.  It is used with water lubricated stern gear installations. It works  according  to an entirely different principle than conventional seals. It seals axially, that  is  to  say along the length. A sliding ring made of high quality stainless steel is mounted onto the  shaft.  It  rotates  with  its  smoothly polished surface against a P.T.F.E. counter sliding ring. This  counter  sliding  ring  is  mounted in a vesconite housing, which is suspended flexibly in a rubber  bellow.  Due  to  the  relatively  small  sealing  areas  only  minimal  radial movement is allowed,  especially  with  the  smallest  diameters.  Therefore  the  Hollex  seal  must always be  installed as close to the fore bearing as possible. With its low frictional resistance, the life span of  the  Hollex  Seal  is  much longer than that of a conventional  seal .There will be no grooves due to the wearing of the packing or the lip seal, so the shaft can rotate freely.

Tides Marine Series One Seal

The Series One seal by Tides Marine is applicable for water lubricated sterngear systems. This seal is made of high quality composite material, that will not absorb water and handles temperature changes well. A water inlet is fitted as a standard on the Series One. The seal should be lubricated by the engine’s cooling water. The high flexible bellow will follow any shaft movement. The actual sealing is done by one lip seal.

Tides Marine SureSeal, For Single Engine Installations

The Tides Marine SureSeals are suitable for water lubricated sterngear installations. This seal is made of a high quality composite material, that is very endurable and will not absorb water. The material handles temperature changes well. The SureSeals have high flexible bellows and come with a water inlet fitted as a standard. The seal should be lubricated by the engine’s cooling water time as the SureSeal, a special Carrier kit can be slipped onto the shaft. These units allow lip seal replacement to be performed without releasing the shaft from the trans- -mission. And, if necessary, this replacement can be done while the vessel is in the water. SureSeals are ABS and Lloyd’s approved.

Tides Marine SureSeal, For Twin Engine Installations

This SureSeal unit has exactly the same abilities and advantages as the SureSeal for single engine installations, only this SureSeal is supplied with two water injections points. One inlet is for the suppy of cooling water from the engine, and one inlet is used to connect the seal to the second seal on the second sterngear installation. When only one engine is running, both seals will remain lubricated.

STB Seal EVO
This flexible seal is used in water lubricated sterngear installations and has it’s own waterinlet. This seal also has a grease supply tip to lubricate the lipseal. The seal consists of a flexible rubber socket and a hose clamp. Including a tube of “stuffy grease” and a water inlet.

STB Seal
This  flexible  seal  is  used  in  water  lubricated  stern gear  installations.  The  seal  consists  of a flexible  rubber  socket  and  a  hose  clamp. Comes complete with yellow protection sleeve for the seal and a tube of “stuffy grease”. 

MARINE SHAFT SEALING

GREASE LUBRICATED

Carco Seal
Carco lip seals are applied in almost every sterntube system, regardless of the lubrication. Lip seals are only applicable with housing, because lip seals are always mounted by meansof axial confinement. They are treated with the brandname Carcoflon coating. This seals the gap perfectly, they are self-lubricating and have a very low friction coefficient. The axial tension is provided by the built-in stainless steel spring.

Carco Seal – Split
Carco lip seals are applied in almost every sterntube system, regardless of the lubrication. Lip seals are only applicable with housing, because lip seals are always mounted by means of axial confinement. Uniquely, these seals are also available in a “split” version. This simplifies main- -tenance, because the propeller shaft installation does not need to be dismantled. With this design the rubber at both ends are a little softer with a guarantee to a perfect closure of the lip seal. Carco lip seals are treated with the brandname Carcoflon coating. This seals the gap perfectly, they are self-lubricating and have a very low friction coefficient. The axial tension is provided by the built-in stainless steel spring.

Share on facebook
Share on linkedin
Share on email
Share on print

AAM Marine Bearings

Rubber lined bearing with brass shell
These rubber lined bearings are especially designed for water lubricated sterntubes and rudder stocks. The nitrile rubber bearing material gives the bearing a high resistance to abrasion and wear whilst providing effective noise and vibration insulation.

Share on facebook
Share on linkedin
Share on email
Share on print

AAM Marine Couplings

HALF COUPLINGS:

Type FL Ø 25 – 60 mm

Flange couplings manufactured in C45 steel, completely machined. The flange couplings are galvanically coated. The flange couplings have a taper of 1:10. The R indicated in the table represents the number of bolt holes in the flange. All dimensions in mm.

Fully Machined Steel Flange Couplings With Keyway Ø 70 – 300 mm

Steel flange couplings can be manufactured on request whole or partly. When ordering, please specify the dimensions of the gearbox flange. Standard the flange couplings have a tapered bore 1:10 and a keyway. All dimensions in mm.

Type FL Ø 25 – 60 mm

Flange couplings manufactured in C45 steel, completely machined. The flange couplings are galvanically coated. The flange couplings have a taper of 1:10. The R indicated in the table represents the number of bolt holes in the flange. All dimensions in mm.

CENTA COUPLINGS:

 Centa offers the perfect, innovative marine transmission. It is a combination of well-proven designs with unique features – freedom in alignment and installation, together with damping of noise and vibration within the transmission. Centa Flex couplings have one or more Centa Flex rubber elements. The rubber elements interrupt structure born noises and dampen noise and vibrations for the highest level of comfort in the boat.
Common Features Of Centa Flex Couplings:


  – A broad range of rating and sizes.
  – Short, lightweight design.
  – Integrated propeller shaft clamping device which can easily be adapted by intermediate bushes for an extensive range of         propeller shaft diameters.
– Patented design.
– The thrust bearings have a spherical outer ring, which means they will always align themselves perfectly to the propeller shaft for
optimum bearing lifetime.

AQUADRIVE MODULINE COUPLINGS

Aquadrive couplings consist of a CV joint, a thrust bearing and an adapter. The CV joint consist of two universal joints connected by a floating axle, which allows axial and radial movements. The thrust bearing transfers the thrust of the propeller through a rubber suspension on the foundation of the craft instead of the gearbox. The Aquadrive Moduline is modular, allowing the overall length to be reduced to 70% and the weight to 75%. The Moduline consists of a thrust bearing being connected to the shaft by a sleeve set. The joint is attached to the thrust bearing with an adapter at one side and connected to the gearbox on the other side with an adapter flange. There is a gearbox adapter available for all existing gearboxes. Aquadrive Moduline couplings are
available for power between 5 and 235 hp.

PYTHON DRIVE COUPLINGS

The Python-drive is a complete drive system for yachts, barges, etc.. With a Python-drive installed you will eliminate the need for alingnment of propeller shaft and gearbox/engine. Axial movement caused by the propellers’ thrust are eliminated and the thrust is passed onto the hull by means of the special suspension of the trust unit. The maintenance-free cv shaft forms the heart of every Python-drive. The heavily built thrust bearing unit is also maintenance-free. The thrust bearing unit is mounted by means of a clamping sleeve. This sleeve centres the propeller shaft where it should be centred; right after the cv shaft of the Python-drive. The cv shaft ensures a constant rpm of the propeller shaft, even at uneven angles, which decreases the wear of rotating parts in the propulsion system. Another big advantage is the very limited built-in length the Python-drive needs. The unit is supplied complete with all needed mounting gear, such as an adaptor flange for most common gearbox types, acv shaft, a robust thrust bearing unit and all bolts, (locking) nuts, and rubbers to take the thrust. For 19 mm up to 100 mm (and imperial sizes), complete units are available. Conical shaft sleeves are also an option. CV shafts for torques up to 1.500 Kgm (14.7 kNm) as well as longer or custom
made shafts are also available on request. Thrust bearing units can be supplied as separate units to be mounted on any position on the propeller shaft.

Share on facebook
Share on linkedin
Share on email
Share on print