Propulsion Train Flashcards
How to we utilize the energy made
What are the main classifications of reduction gears?
Double Helical, Double Reduction, Locked Train, and Articulated.
What is the purpose of the jacking gear in a propulsion system?
It rotates the reduction gears, turbines, and shaft without using steam, aiding in cooldown, startup, maintenance, and emergency situations.
Explain the function of the stuffing box in the stern tube.
To seal the shaft as it passes through the hull, preventing seawater from leaking into the ship.
How does cavitation affect a propeller’s performance?
It causes excessive noise, erosion of the blades, and decreased efficiency.
Why are reduction gears sometimes designed as double-helical?
To eliminate axial thrust and reduce oil lock issues with a groove between the two sets of teeth cut at opposite angles.
What is the main difference between fixed pitch and controllable pitch propellers?
In controllable pitch propellers, the blades can rotate on the hub to change pitch and direction.
How does an articulated reduction gear improve the propulsion system?
It allows for greater power transmission capability in a shorter quill shaft, shortening the overall size of the reduction gears.
What is the main function of the lubrication system in the propulsion train?
To provide lubrication and remove heat generated by bearings in overcoming friction.
Draw a basic lube oil system.
Link to Image: https://drive.google.com/file/d/1koB-xk5HX1lhgRAAm3Qj6s_F-46a3pj5/view?usp=sharing
