OIL SUPPLY SYSTEM AND METHOD FOR SUPPLYING OIL FOR A TURBOPROP ENGINE

摘要

An oil supply system for a turboprop engine comprises a first oil circuit (1) for supplying the turbomachine (2) and a second oil circuit (3) for supplying the propeller gearbox (4) and the high-pressure pump (6) associated with a propeller adjusting device (5). The two oil circuits are integrated into a common oil tank (7) and are connected to each other by means of an oil supply line (14) downstream of the first and second oil pumps (8, 11) in the flow direction in such a way that a limited oil volumetric flow can flow from the first oil circuit into the second oil circuit, and only in said direction, if the pressure difference between the first and second oil circuits (1, 3) falls below a certain level in the event of a pressure reduction in the second oil circuit (3). In this way, sufficiently high oil pre-pressure is produced at the high-pressure pump, even at low propeller speeds and during transient propeller adjustment processes, so that the function of the propeller adjusting apparatus is not impaired and the high-pressure pump is not damaged. Limiting the oil volumetric flow in the oil supply line connecting the two oil circuits ensures that the turbomachine is adequately supplied with oil while oil is being removed from the first oil circuit.