Lubrication :
2. The requirements of a turbo-propeller engine are somewhat different to any other types of aero gas
turbine. This is due to the additional lubrication of the heavily loaded propeller reduction gears and the
need for a high pressure oil supply to operate the propeller pitch control mechanism.
3. Most gas turbine engines use a self-contained re circulatory lubrication system in which the oil is
distributed around the engine and returned to the oil tank by pumps. However, some engines use a
system known as the total loss or expendable system in which the oil is spilled overboard after the engine
has been lubricated.
LUBRICATING SYSTEMS
INTRODUCTION :
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| Fig. 8-1 A pressure relief valve type oil system. |
1. The lubrication system is required to provide lubrication and cooling for all gears, bearings and
splines. It must also be capable of collecting foreign matter which, if left in a bearing housing or gearbox,
can cause rapid failure. Additionally, the oil must protect the lubricated components which are manu-
fractured from non-corrosion resistant materials. The oil must accomplish these tasks without significant
deterioration.
2. The requirements of a turbo-propeller engine are somewhat different to any other types of aero gas
turbine. This is due to the additional lubrication of the heavily loaded propeller reduction gears and the
need for a high pressure oil supply to operate the propeller pitch control mechanism.
3. Most gas turbine engines use a self-contained re circulatory lubrication system in which the oil is
distributed around the engine and returned to the oil tank by pumps. However, some engines use a
system known as the total loss or expendable system in which the oil is spilled overboard after the engine
has been lubricated.
LUBRICATING SYSTEMS
