What is shafting system?
This shafting system is a direct coupling system in which the propeller and the main engine are connected by the intermediate shaft and the propeller shaft, and is designed to support the propeller shaft by forward and aftward stern tube bearings.
What is propeller shafting?
The drive shaft (also called propeller shaft or prop shaft) is a component of the drive train in a vehicle, with the purpose of delivering torque from the transmission to the differential, which then transmits this torque to the wheels in order to move the vehicle.
What is a ships propeller called?
A revolving screw-like device that drives the ship. The screwtype propeller consists of a hub and blades, all spaced at equal angles about the axis. When the blades are integral with the hub, the propeller is known as a solid propeller.
What is a Sterntube?
marine. The watertight tube enclosing and supporting the propeller shaft. It consists of a cast-iron or casted steel cylinder fitted with bearing surface within which the propeller shaft, enclosed in a sleeve, rotates. The sterntube is installed from aft and bolted to the stern frame boss.
What is intermediate shaft in ship?
An intermediate shaft is an important component that transmits power from the engine to the propeller shaft. To suppress torsional vibration in the intermediate shaft that occurs when the engine rotates at low speed, shafts of high strength are required.
What is shaft vessel?
marine. Shafts and associated components used for transmission of power. The main propulsion shafting system consists of shaft sections connected by means of bolted flange couplings and supported by bearings that maintain the shafting in proper alignment.
Is shafting a word?
Present participle of shaft. The definition of a shafting is a system of openings to transmit motion or air, or is slang for unfair treatment. An example of a shafting is a series of openings in a coal mine through which coal and air are transported.
Why propeller is called screw?
The origin of the screw propeller starts at least as early as Archimedes (c. 212 BC), who used a screw to lift water for irrigation and bailing boats, so famously that it became known as Archimedes’ screw.
What is stern gland on ship?
The stern glands thus seal the area between the stern tube and the propeller shaft. The glands are attached at the forward end of the stern tube and prevent the passing of sea water into the ship. The glands also prevent the leaking of oil from the stern bearings into the sea.
What is stern frame in ship?
1 : the timbers in a wooden vessel constituting the upper part of stern or counter. 2 : the forging or casting in a steel ship including in one piece the propeller post with boss, the sternpost with gudgeons, and the arch and solepiece.
What is rudder in ship?
Rudders are hydrofoils which are pivoting on a vertical axis. They are located normally at the stern behind propeller(s) to produce a transverse force and steering moment about the ship centre of gravity by deflecting the water flow to the direction of the foil plane.
What kind of shafting does a ship use?
For high speed small vessels which operate at even lower drafts,number of propellers must be increased to achieve required speed.Commercial vessels have fixed pitch monoblock system.Shafting consist of propeller shaft,tail shaft and intermediate shafts. Propellers are normally build of bronze and shafting of forged steel.
Why does a ship shaft deflect during construction?
However, even though the shafting system is aligned such precisely during the building process in the shipyard, the shaft may still deflect from its original alignment due to the bending of the hull girder. Different bending scenarios occur, depending upon the loading conditions and the sea states the ship is sailing in.
Why are multi shaft ships used for steering?
Multi-shaft ships can use differential power from their engines to bring about steering control, intrinsically a much safer and more satisfactory situation. Another mechanical problem with single shaft layouts is the fact that the shaft has to be along the centerline of the ship, for most of its length above the keel.
Where is the main thrust bearing located on a ship?
The thrust, acting on the propulsion shaft as a result of the pushing effect of the propeller, is transmitted to the ship’s structure by the main thrust bearing. In most ships, the main thrust bearing is located at the forward end of the main shaft within the main reduction gear casing.