Marine machine steering

Marine machine steering DEFAULT

WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

Steering gear

The machinery, rudder actuators, steering gear power units and the means of applying torque to the rudder stock necessary for eff ecting movements of the rudder. Two types of electrohydraulically-powered steering gears are in common use: the ram and the rotary vane.

Auxiliary steering gear  – The equipment other than any part of the main steering gear necessary to steer the ship in the event of failure of the main steering gear but not including the tiller, quadrant or components serving the same purpose, (acc. to SOLAS).

Main steering gear  – The machinery, rudder actuators, steering gear power units, if any, and ancillary equipment and the means of applying torque to the rudder stock (e.g. tiller or quadrant) necessary for effecting movement of the rudder for the purpose of steering the ship under normal service conditions, (acc. to SOLAS).

Ram-type electrohydraulic steering gear  – A ram-type electrohydraulic steering gear consists of two or four hydraulic rams, connected by a link mechanism or a Rapson slide mechanism to the tiller which turns the rudder. A link mechanism transfers the ram movement to the tiller and imparts maximum torque at 35° of rudder movement. The Rapson slide mechanism consists of a block or a sleeve, pivoted to the ram and guided by a crosshead, and arranged to slide on the tiller arm so that the moment arm increases as the rudder angle increases. The rams are moved by hydraulic fluid supplied under pressure by one or two pumps. Usually, two independent pumping units are provided. They are connected so that either may be used to operate the gear, thus eliminating the classification society rule requirement for auxiliary steering gear.

Note: In a passenger ship, under normal service conditions, one unit works. In a cargo ship both units work.

Rotary vane steering gear – The rotary vane system works by introducing pressure into compartments formed between a stator fixed to the ship's structure and a rotor attached to the  rudder stock. There are two or three vanes on the rotor and an equal number on the stator to form the compartments. When steering effort is required, the pressure is increased in the appropriate compartments. The pressure reacts against the fixed vanes and pushes the rotor (and the rudder stock) in the required direction.

To increase the available torque, the diameter oft the unit is enlarged, although it is generally smaller than an equivalent ram type arrangement. Hydraulic pressures are also lower as the working area is larger than the total of the rams on the ram-type gear. Another advantage is the degree of rudder movement: that is up to 65° for Porsgrunn system, and up to 45° for Ulstein's Frydenbo. With ram operated gear the maximum degree of rudder movement is limited by the stroke of the cylinders and the scope of the slider mechanism. One potential disadvantage of the rotary vane system is that if is a fault inside the unit, all steering can be lost and specialist repair is needed. With ram type gear for larger vessels there are four single-acting cylinders so if one ram fails then the steering is not totally disabled. The working parts are also accessible in the event of a necessary repair and the rams are relatively simple to replace if a spare is carried.

According to the Motor Ship July 1996.

Sours: https://www.wartsila.com/encyclopedia/term/steering-gear

Marine Hydraulic Steering Gear Description

1000kn·m test stand for hydraulic steering gear from our company is the biggest one in China
recently. It can simulate practical work condition of ship to load the product during navigation, in addition,
it use high-precision digital instrument to automatically test and record the output torque and mechanical
efficiency of tested steering gear at any rudder turning angles.The test stand is used for test our steering
gears, such as linked cylinder type, ram type and rotary vane type steering gear.

Model Introduction

YD-(A/B/Z) (X)-(12/20/28)-(Y)-(Z)-(W)

YD-Electro-hydraulic steering gear A-Fork type B-Linked Ram type Z-Rotary Vane type X-Torque(kn.m) 12/20/28-Rudder turning time(S) Y-No of Rudder(1-single/2-double/3-three) Z-Control method(ZK-direct control/DK-electronic control/BK-pump control) W:No of motor

Usage

The electro-hydraulic steering gear is mainly composed by a set of rudder device, electro-controlled pump station, emergency system, operation console and spare oil tank.
The rudder devices consist of rudder-pushing device, manual isolation valves, rudder angle indicator etc. It can be sorted of one single rudder unit, double rudder units, special orders can be 3~4 rudder units.
The rudder-driving device is a mechanism which can change hydraulic energy into mechanical energy, by driving the rudder stock moving.
The electro-controlled pump station is a device which supply and control the hydraulic energy. The fuel tank, motor pump group and hydraulic system control valves are integrated.Normaly, the steering gear equipped with two sets of pump stations and can be used alternately. Due to the system’s transform can be quick and convenient, the rudder can be controlled both in the cab or engine room.
There are many emergency system types according to different navigation zone, such as handle pump, bladder accumulator and DC motor pump sets.
The operate methods of steering gear include manual operation, servo-control, automatic control.
Different ships choose different control way.

Categories: Marine Deck Machinery, Marine Industry

Sours: https://acbluestarmarine.com/product/marine-hydraulic-steering-gear/
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Old 28-06-2019, 06:50 AM  

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Marine Machine Hydraulic Steering


In good condition as you can see in the picture.

Offers are welcome and we could arrange the shipping cost.

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Old 29-06-2019, 05:00 AM  

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hello I am interested in the steering is this tilpen for mercury what is your location and what do you want for it

greetings pascal

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Old 04-07-2019, 08:28 AM  

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Hi Pascal, I've just let you a private message.

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Old 04-12-2019, 04:35 PM  

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Still for sale.

Uploaded new pictures

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Old 01-01-2020, 09:53 PM  

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Sent you a pm.

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Old 12-03-2020, 10:45 AM  

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Still for sale

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Old 04-05-2020, 11:23 PM  

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Hi
Is this still available ?

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Old 12-09-2020, 07:44 PM  

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Still available...

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Old 22-12-2020, 11:18 PM  

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What is the brand of the cylinder?

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Old 23-12-2020, 08:28 AM  

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Marine Machine the whole package

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Legendary Marine \u0026 Optimus Steering
Replacement Seal Kit for Mayfair Hydraulic Rams

Replacement Seal Kit for Mayfair Hydraulic Ram

137-9248


This kit includes Seals and O-rings for replacing worn-out ones in a Mayfair hydraulic steering ram.
Includes instructions.

NOTE: Fits 100% of Production Year 2000 and above Mayfair Rams, may work on other rams but NO guarantee.


Mayfair Steering Ram End Bushing

Mayfair "Space Saver" Steering Ram 7" Stroke

137-9275


  • 7" Stroke Hydraulic Replacement Steering Ram
  • Space Saver Ram for tight spaces
  • Requires two 137-9227 bushings, sold separately, see related parts.
  • 1/4" NPT female fittings.
  • Measures 13.87" closed from center eyelet to end of threads.
  • See Product Specs for detailed measurements.

Mayfair Steering Ram End Bushing

Mayfair Steering Ram 9" Stroke

137-9234


  • 9" Stroke Hydraulic Replacement Steering Ram
  • Requires two 137-9227 bushings, sold separately, see related parts.
  • 1/4" NPT female fittings.
  • Measures 17.17" closed from center eyelet to end of threads.
  • See Product Specs for detailed measurements.











Sours: https://www.hardin-marine.com/c-1868-steering-rams.aspx

Machine steering marine

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How to install Hydrodrive Hydraulic Steering Systems

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