Propulsion apparatus for ship

Abstract

Provided is a ship propelling apparatus including a rotation shaft on which a rear propeller is fixed; a front propeller rotatably supported on the rotation shaft in front of the rear propeller; and a counter-rotating device through which the rotation shaft passes, which includes a gear box including therein a plurality of gears configured to reverse rotation of the rotation shaft and transfer the reversed rotation to the front propeller, and which is installed in an installation space formed at the rear of a ship. The rotation shaft includes a measurement hole formed to pass through a center of the rotation shaft for centering of the counter-rotating device installed in the installation space; and an individual lubricant path separated from the measurement hole.

Description

TECHNICAL FIELD[0001]The present invention relates to a ship propelling apparatus in which two propellers rotate in opposite directions to generate a propulsive force, and a ship including the same.BACKGROUND ART[0002]In general, a ship propelling apparatus includes one spiral propeller. However, in the case of a propelling apparatus including one propeller, the rotational energy of water streams generated when the propeller rotates cannot be used as a propulsive force, thereby causing a high energy loss.[0003]A counter-rotating propeller (CRP) is capable of collecting rotational energy, which may be lost, as a propulsive force. In the CRP, a propulsive force is generated as two coaxial propellers rotate in opposite directions. The rotational energy of a fluid passing through a front propeller is collected as a propulsive force by a rear propeller as the rear propeller rotates reversely. Thus, the CRP exhibits a higher propelling performance than a propelling apparatus including one...

AI Technical Summary

Benefits of technology

The propelling apparatus described in this patent has several technical effects. Firstly, it is easy to manufacture and install due to the rotation shaft's measurement hole and gear box's separation from the ship. Secondly, it is easy to maintain and repair due to the gear box's separation from the ship. Thirdly, it has a smaller volume and simpler drivetrain system compared to conventional methods, which allows for its installation in a ship's tail. Fourthly, it reduces the need for lubrication, simplifies the structure of the drivetrain system, and minimizes problems caused by lubrication. Fifthly, it includes a sealing device that improves sealing performance by allowing for radial displacement of the front and rear propellers. Lastly, it uses a bolt to efficiently separate the gear box from an installation space in a ship's tail.

Problems solved by technology

However, in the case of a propelling apparatus including one propeller, the rotational energy of water streams generated when the propeller rotates cannot be used as a propulsive force, thereby causing a high energy loss.

However, since the CRP includes a counter-rotating device enabling two propellers to rotate in opposite directions, a hollow shaft, etc., the CRP is thus relatively difficult to manufacture, install, maintain, and repair.

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