Geared Turbine Engine Gutter Channel for Higher Oil Capture

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Solution Overview

Problem

Existing fluid collection gutters in geared turbofan engines have low oil capture efficiency, leading to reduced power transfer efficiency and insufficient lubrication due to churning lubrication oil re-contacting the gear train and inadequate lubrication oil availability during negative g maneuvers.

Innovation Solution

A fluid collection gutter with specific channel geometries and configurations, including tapered and multi-region cross-sectional designs, to enhance fluid capture efficiency by minimizing gas interference and optimizing fluid flow, thereby improving lubrication and power transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a conventional gutter configuration is used, then the structure is simple, but the oil capture efficiency is low

Engineering Contradiction:

Improveoil capture efficiencyVSAvoidgutter structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The gutter channel is divided into multiple regions (first region, second region, third region) with different geometric characteristics. Each region has specific dimensional relationships (width ratios, height ratios) that optimize fluid capture at different locations, transforming a simple uniform channel into a segmented functional structure that systematically improves oil capture efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the gutter channel are given different geometric properties tailored to their specific functions. The first region has a narrower width to capture oil at the inlet, the second region has optimized dimensions for transport, and the third region has specific geometry for discharge. This local differentiation of channel properties maximizes overall capture efficiency while maintaining structural coherence.

Inventive Principle:

Principle #3Local quality

2Productivity

If the channel area is large, then more oil can be captured, but gas interference increases and reduces capture efficiency

Engineering Contradiction:

Improveoil capture efficiencyVSAvoidgas interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent optimizes specific geometric parameters of the channel (width, height, area ratios) to achieve the optimal balance between capture capacity and gas interference. By carefully controlling the channel cross-sectional dimensions and their ratios, the design maximizes oil capture while minimizing the harmful effects of gas presence in the channel.

Inventive Principle:

Principle #35Parameter changes

3Power

If lubrication oil is not efficiently captured, then the gutter structure remains simple, but power transfer efficiency decreases due to churning

Engineering Contradiction:

Improvepower transfer efficiencyVSAvoidgutter structure complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The channel is segmented into functional regions that systematically address the power loss problem. The first region captures oil before it can churn, the second region transports it efficiently, and the third region discharges it properly. This segmentation prevents oil from re-contacting gear surfaces and churning, thereby maintaining power transfer efficiency without requiring complex external systems.

Inventive Principle:

Principle #1Segmentation

4Reliability

If oil capture efficiency is low, then the gutter design is simpler, but lubrication availability during negative g maneuvers is insufficient

Engineering Contradiction:

Improvelubrication availabilityVSAvoidgutter structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The gutter design proactively captures and stores lubrication oil during normal operating conditions through its optimized channel geometry. By efficiently collecting and holding the oil in the structured channel system before negative g maneuvers occur, the design ensures lubrication availability when needed most, without requiring separate storage systems or complex active management.

Inventive Principle:

Principle #10Preliminary action

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 designed gutter significantly increases fluid capture efficiency, reducing churning and re-contact, enhancing lubrication availability, and maintaining power transfer efficiency even under adverse conditions.

Implementation Method 1

Methodology Applied

Scientific EffectFluid flow optimization:

Data Source

PatentEP3961068B1Fluid collection gutter for a geared turbine engine

Publication Date: 2025.08.13 RTX CORP

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AI summary

A turbine engine system includes a gutter (40) and a gear train (22) with an axial centerline (28). The gutter (40) is disposed radially outside of the axial centerline (28). The gutter (40) at least partially circumscribes the gear train (22), and includes an inner surface (42) and a channel (44). The channel (44) receives fluid directed out of the gear train (22). The channel (44) extends radially into the gutter (40) from the inner surface (42) to a channel end (84), and circumferentially to a channel outlet (58, 58'). At least a portion of the channel (44) has a cross-sectional channel geometry that tapers axially as the channel (44) extends radially towards the channel end (84).