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| Sterntube bearing |
The
sterntube bearing serves two important purposes. It supports the
tailshaft and a considerable proportion of the propeller weight. It also
acts as a gland to prevent the entry of sea water to the machinery
space.
Early
arrangements used bearing materials such as lignum vitae (a very dense
form of timber) which were lubricated by sea water. Most modern designs
use an oil lubrication arrangement for a white metal lined sterntube
bearing. One arrangement is shown in Figure 11,4.
Oil
is pumped to the bush through external axial grooves and passes through
holes on each side into internal axial passages. The oil leaves from
the ends of the bush and circulates back to the pump and the cooler. One
of two header tanks will provide a back pressure in the system and a
period of oil supply in the event of pump failure. A low-level alarm
will be fitted to each header tank.
Oil
pressure in the lubrication system is higher than the static sea water
head to ensure that sea water cannot enter the sterntube in the event of
seal failure.
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