16. State about stern tube:

-Explain structure & function of all components?

-Principle of operation?

-There are many differences in structure of stern tube depending on individual ship and kinds of stern bearing

-Function:

+To place bearing for supporting of propeller and propeller shaft.

-Requirement:

+With heavy load, so its structure must be strong enough to withstand the acting forces

-Structure:

+At the aft end of stern tube is provided with lock nut to secure stern tube to stern frame. The fore end of stern tube is secured to bulkhead by bolts and nuts.

1- Propeller shaft

2- Stern tube

3- Metal bush

4, 5- Stern bearing

6- Stern frame

7- Stern tube nut

8- Retaining ring

9- Gland cover

10- Packing

11- Aft peak bulkhead

12- Water pipe