Gravity-Fed Sump Tank Layout to Prevent Lubricant Splashing
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Solution Overview
Problem
Mechanical systems, particularly in rotary-wing aircraft, face issues with lubricating fluid splashing during tilting, leading to unwanted heating and potential component damage, and existing systems either suffer from sump-related space constraints or risk external leakage.
Innovation Solution
A hybrid lubricating fluid system with a tank located above the components to be lubricated, allowing lubricating fluid to flow by gravity, which also includes a lift flow generator to refill the tank during operation, minimizing splashing and ensuring continuous operation in case of leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a wet sump system is used to store lubricating fluid in the bottom of the sump, then the system is simple and effective for lubrication, but the fluid may splash onto components during substantial tilting, causing unwanted heating
Solution Approach 1:
The patent moves the fluid storage location from the bottom (vertical dimension) to the top of the sump, changing the spatial dimension of fluid containment. This dimensional shift prevents splashing during tilting while maintaining system effectiveness for lubrication and cooling
2Object-affected harmful factors
If a tank is placed outside the mechanical system to prevent splashing, then splashing is prevented, but the system risks external leakage between the mechanical system and the tank
Solution Approach 1:
The patent nests the tank within the sump structure, placing it in the upper part of the existing sump volume. This nested arrangement prevents external leakage risks while maintaining the anti-splashing benefit, as the tank is contained within the sealed sump environment
3Reliability
If the lubricating fluid system is dimensioned to convey fluid throughout the authorized flight envelope, then all components are properly lubricated during tilting, but the sump requires significant space to accommodate the fluid volume
Solution Approach 1:
The patent employs a dynamic fluid management system where a lift flow generator actively transfers fluid between the tank and sump bottom during operation. This dynamic approach ensures proper lubrication coverage during tilting while minimizing the static fluid volume required in the sump, reducing overall space requirements
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents splashing during tilting, reduces fluid volume in the sump, and ensures continuous operation for a predetermined time in case of failures, meeting regulatory requirements while optimizing space and reducing leakage risks.
Implementation Method 1
the lubricating fluid flowing out of the tank, in particular naturally and therefore without external action, by force of gravity, so as to reach said at least one component to be lubricated or cooled
Implementation Method 2
the lubricating fluid system comprising at least one lift flow generator connected by at least one filling line to the tank and to at least one suction point present in a bottom of the sump, said lift flow generator being configured to fill the tank with the lubricating fluid present in said bottom at least during a starting phase
Data Source
AI summary
A mechanical system comprising a sump and at least one component to be lubricated or cooled arranged in the sump, the mechanical system comprising a lubricating fluid system provided with a lubricating fluid and a tank arranged in the sump. The tank is a leaking tank and is situated above said at least one component to be lubricated or cooled, the lubricating fluid flowing out of the tank by force of gravity, so as to reach said at least one component to be lubricated or cooled. The lubricating fluid system has at least one lift flow generator connected by at least one filling line to the tank and to at least one suction point present in a bottom of the sump. The lift flow generator fills the tank with the lubricating fluid present in said bottom at least during a starting phase.