Emergency lubrication device of simplified architecture for a power transmission main gearbox of an aircraft

An emergency lubrication system comprising:

• a tank configured to hold lubrication liquid for a mechanical system, the tank being disposed at a first height, the tank being spaced from and not fluidly connected to a main lubricant system;
• a distribution portion including a constricting section, the distribution portion located inside the mechanical system and disposed at a second height below the first height;
• and
• a pipe connecting the tank to the distribution portion and capable of directing lubrication liquid from the tank to the distribution portion by gravity, at least part of the pipe being located inside the mechanical system;
• and
• a trigger having a closed position where lubrication liquid is blocked from entering the pipe during operation of the main lubricant system, and an open position where upon malfunction of the main lubricant system, lubrication liquid flows from the tank through the pipe to the distribution portion by gravity to be supplied to the mechanical system,
• wherein, the distribution portion and the pipe are positioned such that the lubricant liquid is heated by the mechanical system as it flows through the pipe and distribution portion so that a flow rate of the lubrication liquid through the distribution portion is substantially equal to or greater than a minimum flow rate.

An emergency lubrication system comprising:

• a tank configured to hold lubrication liquid for a mechanical system, the tank being disposed at a first height, the tank being spaced from and not fluidly connected to a main lubrication system;
• a distribution portion including a constricting section, the distribution portion located inside the mechanical system and disposed at a second height below the first height;
• and
• a pipe connecting the tank to the distribution portion and capable of directing lubrication liquid from the tank to the distribution portion by gravity, at least part of the pipe being located inside the mechanical system;
• and
• a trigger enabling lubrication liquid to flow from the tank through the pipe to the distribution portion to be supplied to the mechanical system in the event of a malfunction of the main lubrication system being detected,
• wherein, the distribution portion and the pipe are positioned to be heated by the mechanical system so that a flow rate of the lubrication liquid through each of the at least one distribution portions is substantially equal to or greater than a minimum flow rate.