Chapter 5 -FUNDAMENTALS OF SHIP PROPULSION AND STEERING 



THRUST 

 COLLAR 



BASE 

 RING 



OIL 

 FILM 



A STATIONARY VIEW 



B ROTATING VIEW 



LEVELING PLATES 



BASE RING ^JOINT IN BASE RING 



C EXTENDED VIEW 



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Figure 5-11.— Diagrammatic arrangement of Kingsbury thrust bearing. 



is located at the inner end of the stern tube. 

 This gland, which is shown in figure 5-13, seals 

 the area between the shaft and the stern tube, 

 but still allows the shaft to rotate. 



The stuffing box of the stern tube gland is 

 flanged and bolted to the stern tube. The casting 

 is divided into two annular compartments. The 

 forward space is the stuffing box proper; the 

 after space has a flushing connection for pro- 

 viding a positive flow of water through the stern 

 tube for lubricating, cooling, and flushing. The 

 flushing connection is supplied by the fire and 

 flushing system. A drain connection may be 

 provided, 



A strut bearing is shown in figure 5-14; The 

 strut bearing has a composition bushing which is 

 split longitudinally into two halves. The outer 

 surface of the bushing is machined with steps to 

 bear on matching landings in the bore of the 

 strut. One end is bolted to the strut. 



The shells of both stern tube and strut bear- 

 ings are of bronze lined with a suitable bearing 

 wearing material. The shells are normally 

 grooved longitudinally to receive strips of 



OIL GROOVES DISTRIBUTE 

 THE OIL WITHIN THE BEARING 



OIL RINGS CARRY 

 OIL TO THE TOP 

 OF THE SHAFT 



EXCESS OIL DRAINS 

 BACK TO THE RESERVOIR, 

 WHERE IT COOLS 

 BEFORE RECIRCULATION 



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Figure 5-12.— Line shaft bearing. 



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