Curved Oil Recovery Gutter Deflector for Aircraft Gearboxes
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Solution Overview
Problem
Existing lubricating oil recovery gutters in mechanical reducers for aircraft turbomachines are inefficient, allowing oil to fall back onto rotating parts, leading to significant losses and inefficiencies.
Innovation Solution
A lubricating oil recovery gutter with a deflector and discharge channel configured to gradually divert oil radially outward, featuring a curved shape and controlled deflection angles to minimize turbulence and improve oil collection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional gutter is used to recover lubricating oil, then the gutter structure is simple, but the oil recovery efficiency is poor and oil falls back onto rotating parts
Solution Approach 1:
The gutter is divided into multiple functional segments: a collection zone with vertical walls to capture oil, a transition zone with inclined walls to redirect oil flow, and a discharge zone with a deflector. This segmentation allows each section to perform its specific function optimally, improving overall oil recovery efficiency while maintaining manageable structural complexity.
Solution Approach 2:
The gutter incorporates curved surfaces and inclined walls instead of purely straight geometric forms. The transition from vertical to inclined walls creates smooth flow paths that guide oil efficiently toward the discharge point, reducing turbulence and improving recovery effectiveness without excessive structural complexity.
2Loss of substance
If the gutter retains oil partially, then the gutter structure is simple, but significant oil quantity bounces off the walls and falls back onto rotating parts
Solution Approach 1:
The gutter design proactively prevents oil from bouncing off by incorporating vertically extending walls that contain the oil flow before it can escape. The inclined transition walls are designed to redirect oil flow smoothly toward the discharge point, counteracting the centrifugal and gravitational forces that would otherwise cause oil to bounce back onto rotating parts.
Solution Approach 2:
The design utilizes the centrifugal force and flow dynamics that initially cause oil to bounce off the gutter walls and converts them into beneficial flow patterns. The inclined walls and deflector are positioned to harness these forces and redirect oil flow constructively toward the discharge point, transforming potential loss into effective oil recovery.
3Speed
If the deflector guides oil quickly to the suction point, then the oil evacuation speed is high, but turbulence increases and collection efficiency decreases
Solution Approach 1:
The deflector and discharge channel incorporate curved surfaces and smooth transitions instead of sharp angles or abrupt changes. This allows oil to be guided quickly toward the suction point while maintaining laminar flow conditions, reducing turbulence and improving collection efficiency simultaneously.
Solution Approach 2:
The gutter design adapts its geometry along the oil flow path: vertical walls at the collection zone for containment, inclined walls in the transition zone for redirection, and a curved deflector near the discharge point for smooth guidance. This dynamic geometric adaptation optimizes both evacuation speed and collection efficiency at different stages of oil flow.
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 gutter design enhances oil recovery rates by reducing losses and preventing oil from falling back onto rotating parts, thereby improving the mechanical reducer's efficiency and reducing operational losses.
Implementation Method 1
a discharge channel configured to deflect oil from the main sleeve and having a curved shape such that a first end of the discharge channel, communicating with the internal cavity, is tangent to the main body, the discharge channel then progressively deviating, by its curved shape, to a second end directed towards the outside with respect to the annular main body
Data Source
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AI summary
Lubricating oil recovery gutter (100), particularly for a mechanical gearbox of an aircraft turbomachine, comprising an annular main body (101) about a central axis (X), and a deflector (300) fixed to the main body and configured to allow the oil to be evacuated radially from an internal cavity of the main body (101) to the outside of the gutter, the deflector (300) comprising a main sleeve (330) disposed in continuity with the main body (101), and a discharge channel (310) configured to deflect oil from the main sleeve (330) and having a curved shape such that a first end (311) of the discharge channel, communicating with the internal cavity, is tangent to the main body (101), and a second end (312) of the discharge channel is directed outwards relative to the annular main body (101).