Exam Question
Sketch and describe how the torque is transmitted to the rudder stock in a rotary vane steering gear. (16)
Class 4 (4th Engineer)
MEKG
📅 Jun 2025
Reference Answer
### 1. Principle of Operation
The rotary vane steering gear is a high-torque hydraulic actuator that converts hydraulic pressure directly into a turning moment (torque) on the rudder stock. It operates on the principle of applying high-pressure hydraulic fluid to one side of rotating vanes attached to a rotor, while the other side is connected to a low-pressure return. The resulting differential pressure creates a powerful force on the vanes, generating the torque required to turn the rudder. This design is compact and efficient as it eliminates the need for traditional linkages like rams, tillers, and crossheads.
### 2. Construction
The unit consists of two main components, the stator and the rotor, which are precision-machined to form sealed hydraulic chambers.
The rotary vane steering gear is a high-torque hydraulic actuator that converts hydraulic pressure directly into a turning moment (torque) on the rudder stock. It operates on the principle of applying high-pressure hydraulic fluid to one side of rotating vanes attached to a rotor, while the other side is connected to a low-pressure return. The resulting differential pressure creates a powerful force on the vanes, generating the torque required to turn the rudder. This design is compact and efficient as it eliminates the need for traditional linkages like rams, tillers, and crossheads.
### 2. Construction
The unit consists of two main components, the stator and the rotor, which are precision-machined to form sealed hydraulic chambers.
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