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Electrical remote control system for steering gear ? How the system works

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.

Steering gear electrical control

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 Info:

Operational guidance and basic principles for steering gears on board

Functional requirement for steering gear arrangement of cargo ships

Operation of telemotor control for steering gear

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