DUAL CIRCUIT LUBRICATION METHOD AND DEVICE WITH INCREASED RELIABILITY FOR A MAIN POWER TRANSMISSION GEARBOX OF AN AIRCRAFT

摘要

A dual circuit lubrication device for lubricating a mechanical system, the lubrication device being provided with two independent lubrication circuits and a tank that is common to both lubrication circuits and that contains a lubrication liquid. A first lubrication circuit has two first suction points for sucking in the lubrication liquid and situated inside the tank, and a second lubrication circuit includes a second suction point for sucking in the lubrication liquid and situated inside the tank. The dual circuit lubrication device has means for detecting the lubrication liquid passing below a limit depth in the tank, which means are formed by a high first suction point situated at the level of the limit depth, the second suction point being situated below the limit depth, and a low first suction point being below the second suction point.

主权项

1. A dual circuit method of lubricating a mechanical system that includes a tank containing a lubrication liquid, the method comprising:
using the lubrication liquid to lubricate the mechanical system simultaneously via a first lubrication circuit and a second lubrication circuit, the second lubrication circuit having a second suction point situated below a limit depth in the tank, the first lubrication circuit including at least one first suction point that can be situated below the second suction point; detecting a drop in the level of the lubrication liquid in the tank to below the limit depth; stopping the flow of the lubrication liquid in the first lubrication circuit; measuring the pressure of the lubrication liquid in the second lubrication circuit; detecting a drop of the pressure of the lubrication liquid in the second lubrication circuit; reestablishing the flow of the lubrication liquid in the first lubrication circuit; and stopping the flow of the lubrication liquid in the second lubrication circuit.