Lubricating oil recovery system for aero engine - has auxiliary oil recovery pump driven by hydraulic motor using parts of feed oil for use if main recovery pump fails

摘要

The oil comes from the reservoir and is supplied to the engine by the main oil pump and lubricating oil is supplied to the bearing through a nozzle. A hydraulic motor takes oil from the supply line and drives an auxiliary oil pump. The oil from the bearing falls into a sump whch is connected to the suction of the oil recovery pump, which returns the oil to the tank. The auxiliary pump has its suction high in the sump to take the frothy oil or all the return oil if the recovery pump fails. The return oil from the pump is cooled by heat exchange with oil from the hydraulic motor.