Intermediate Shaft

The marine intermediate shaft is a key component in the ship's transmission system.   The following is a detailed introduction:

Function

• Power transmission: During the ship's power transmission process, it is located between the main engine and the propeller shaft, and transmits the torque generated by the main engine to the propeller shaft, driving the propeller to rotate, so that the ship can obtain forward or backward power.

• Adjusting position and angle: The position and angle of the transmission shaft system can be adjusted according to the structural layout and transmission requirements of the ship to make the power transmission smoother and adapt to the different working conditions and navigation requirements of the ship.

• Buffering and shock absorption: It can buffer and absorb the vibration and impact generated by the operation of the main engine and the propeller to a certain extent, reduce the impact on other parts of the ship, protect the main engine and propeller, and improve the stability and stability of the transmission system.

Structural features

• Various shapes: Common ones are straight shafts, which are simple in design, easy to manufacture and maintain, and are used for general ship power transmission;   there are also curved shafts, which can adapt to special ship layouts or transmission requirements and reduce transmission system components;   the diameter of the tapered shaft gradually changes in the length direction, which is used to connect transmission components of different diameters to achieve smooth torque transmission.

• Connection method: Flange connection is usually adopted at both ends, and the intermediate shaft is tightly connected with the main engine output shaft, propeller shaft or gearbox and other components by bolts to ensure the stable transmission of power;   spline connection or coupling connection is also adopted to meet different transmission requirements and installation conditions.

• Support structure: It needs to be supported by the intermediate bearing.   The intermediate bearing is generally installed on the base or bracket of the hull to provide stable support for the intermediate shaft, reduce the deformation and vibration of the shaft during rotation, and ensure the operation accuracy and stability of the shaft.

Manufacturing material

• High-strength alloy steel: such as 42CrMo, 34CrNiMo6, etc., with high strength, good toughness and fatigue resistance, can withstand high torque and complex stress in the ship transmission system, and ensure the stability of the intermediate shaft during long-term use.

• Good carbon steel: like 45# steel, after proper heat treatment and surface treatment, it can meet the performance requirements of the intermediate shaft of some small and medium-sized ships, and has good comprehensive performance and economy.

Application scenarios

• Large transport ships: such as bulk carriers, tankers, container ships, etc.   These ships usually use low-speed high-power diesel engines as the main engine.   The intermediate shaft is used to transmit the power of the main engine to the propeller shaft, drive the propeller to rotate, and propel the ship to sail long distances in the ocean.

• Engineering ships: such as dredgers, crane ships, etc., which need to frequently start, stop and adjust the speed and direction of the propeller during work.   The intermediate shaft must be able to adapt to such frequent load changes and dynamic working conditions to ensure the stability and stability of power transmission.

• High-speed ships: such as speedboats, high-speed passenger ships, etc., have high requirements for the efficiency and response speed of power transmission.   The intermediate shaft must have the characteristics of low rotational inertia and high transmission efficiency to meet the needs of high-speed navigation of ships.