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Electrical Remote Control System for Ships Steering Gear
The steering gear provides a movement of the rudder in response to a
signal from the bridge. The total system may be considered made up of
three parts, control equipment, a power unit and a transmission to the rudder
stock.
The control equipment conveys a signal of desired rudder angle
from the bridge and activates the power unit and transmission system
until the desired angle is reached. The power unit provides the force,
when required and with immediate effect, to move the rudder to the
desired angle. The transmission system, the steering gear, is the means
by which the movement of the rudder is accomplished.
Electrical control
The electrical remote control system is commonly used in modern
installations since it uses a small control unit as transmitter on the bridge
and is simple and reliable in operation.
The control box assembly, which is mounted on the steering gear, is
shown in Figure . Movement of the bridge transmitter
results in electrical imbalance and current flow to the motor. The motor
drives, through a flexible coupling, a screw shaft, causing it to turn. A
screw block on the shaft is moved and this in turn moves the floating
lever to which a control rod is attached.
Fig:Steering gear electrical control
The control rod operates the
slipper ring or swash plate of the variable delivery pump. A cut-off lever
connected to the moving tiller will bring the floating lever pivot and the
lever into line at right angles to the screw shaft axis. At this point the
rudder angle will match the bridge lever angle and the pumping action
will stop. The rotating screw shaft will have corrected the electrical
imbalance and the motor will stop.
For local manual control, the
electrical control is switched off and a small handwheel is connected to
the screw shaft. A detent pin holds the handwheel assembly clear when
not in use. Rotation of the handwheel will move the floating lever and
bring about rudder movement as already described.
Related information
-
Ships steering gear testing requirement
The regulations SOLAS Chapter V Regulation 26 and 33 CFR Chapter 1 164.25 “Tests before entering or getting underway” have to be complied with.
During stays in port between voyages or passages a test is to be carried out within 12 hours of the estimated time of "stand by departure"....
- Oil lubricated sterntube bearing, sterntube seals & shafting arrangement
The sterntube bearing serves two important purposes. It supports the tailshaft and a considerable proportion of the propeller weight. It also acts as a gland to prevent the entry of sea water to the machinery space.....
-
Function of solid fixed pitch propeller & Propeller mounting
The propeller consists of a boss with several blades of helicoidal form attached to it. When rotated it 'screws' or thrusts its way through the water by giving momentum to the column of water passing through it. The thrust is transmitted along the shafting to the thrust block and finally to the ship's structure....
- Controllable pitch propeller
A controllable pitch propeller is made up of a boss with separate blades mounted into it. An internal mechanism enables the blades to be moved simultaneously through an arc to change the pitch angle and therefore the pitch....
-
Ships propeller shaft -Thrust block & Shaft bearings
The transmission system on a ship transmits power from the engine to the propeller. It is made up of shafts, bearings, and Finally the propeller itself. The thrust from the propeller is transferred to the ship through the transmission system....
-
Ships steering gear arrangement and testing requirement
The main steering gear is to be capable of putting the rudder over
from 35° on one side to 35° on the other side with the ship at its deepest
draft and running ahead at maximum service speed, and under the same
conditions from 35° on either side to 30° on the other side in not more than
28 seconds.....
-
Ships steering gear electrical control
The electrical remote control system is commonly used in modern installations since it uses a small control unit as transmitter on the bridge
and is simple and reliable in operation.Movement of the bridge transmitter
results in electrical imbalance and current flow to the motor.
.....
-
Ships steering gear telemotor control
Telemotor control is a hydraulic control system employing a transmitter, a receiver, pipes and a charging unit. The transmitter, which is built into
the steering wheel console, is located on the bridge and the receiver is
mounted on the steering gear..
.....
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