Class 4 (4th Engineer) MEKG 📅 Jun 2023

Exam Question

(a) What is the stern tube bearing and why it is provided? (4)

(b) Name the bearing material used & how same lubricated & cooled? (3)

(c) For 'oil lubricated' stern tubes, how oil is prevented from flowing out? Explain sealing arrangement with line sketch & material used. (6)

(d) Name the type of oil used for lubrication. (3)

Reference Answer

### (a) Stern Tube Bearing and its Purpose (4 Marks)
A stern tube bearing is a specialized journal bearing located within the stern tube assembly at the aft end of the ship's hull. It is the final outboard support for the propeller shaft (tailshaft) before the propeller.
Its primary purposes are:
* **Support & Load Bearing:** To support the significant weight of the propeller and the overhanging portion of the propeller shaft. As stated in the provided context, it is crucial for transferring the radial forces acting on the propeller (due to hydrodynamic effects) to the ship's hull structure.

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