Exam Question
(a) Describe the function of Thrust bearing (4)
(b) Draw diagrammatic sketch of Thrust bearing and show the lubrication of each part (8)
(c) Describe the lubrication problems of thrust bearing (4)
Class 4 (4th Engineer)
MEKM
📅 Feb 2023
Reference Answer
### (a) Function of a Thrust Bearing (4 Marks)
The primary and critical function of a main propulsion thrust bearing, often referred to as a thrust block, is to transmit the axial thrust generated by the propeller to the ship's hull structure, thereby propelling the vessel either ahead or astern.
Key functional aspects are as follows:
* **Thrust Transmission**: The propeller generates a powerful axial force (thrust) along the shaft line. The thrust bearing absorbs this force from the rotating propeller shaft and transmits it through its housing and foundation into the ship's rigid structure. It is crucial to note that it transmits **axial thrust**, not rotational torque, which is the function of the shafting itself.
The primary and critical function of a main propulsion thrust bearing, often referred to as a thrust block, is to transmit the axial thrust generated by the propeller to the ship's hull structure, thereby propelling the vessel either ahead or astern.
Key functional aspects are as follows:
* **Thrust Transmission**: The propeller generates a powerful axial force (thrust) along the shaft line. The thrust bearing absorbs this force from the rotating propeller shaft and transmits it through its housing and foundation into the ship's rigid structure. It is crucial to note that it transmits **axial thrust**, not rotational torque, which is the function of the shafting itself.
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