 |
| Fig. 8-11 A thread-type oil filter. |
assemblies to the bearing housings, a 'squeeze film' type of bearing is used (fig. 8-9). They have a small
clearance between the outer race of the bearing and housing with the clearance being filled with oil. The
oil film dampens the radial motion of the rotating assembly and the dynamic loads transmitted to the
bearing housing thus reducing the vibration level of the engine and the possibility of damage by fatigue.
28. To prevent excessive air pressure within the oil tank, gearboxes and bearing chambers, a vent to
atmosphere is incorporated within the lubrication system. Any oil droplets in the air are separated out
by a centrifugal breather prior to the air being vented overboard. Some breathers may incorporate a
porous media, forming de-aerator segments, which improves the efficiency of the oil separation (fig, 8-10)
