Transfer Gearbox Layout for Thinner Turbine Engine Cowls

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Solution Overview

Problem

Existing gas turbine engines face challenges in efficiently powering accessory systems due to the need for different rotational inputs, which can affect the aerodynamic shape and size of the outer cowl, impacting fuel efficiency.

Innovation Solution

The integration of a transfer gearbox (TGB) and accessory gearbox (AGB) system, where the first accessory is located within the inner cowl space and coupled to the TGB, improving aerodynamics by allowing the outer cowl to be thinner and more streamlined.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If accessory systems are powered directly from the gas turbine engine, then power transmission is simple, but the outer cowl must be thicker to accommodate the accessory gearbox, worsening aerodynamics and fuel efficiency

Engineering Contradiction:

Improvefuel efficiencyVSAvoidouter cowl thickness

Core Design Contradiction:

Loss of energyVSLength of stationary object

Solution Approach 1:

The patent relocates the accessory gearbox from the traditional radial position (requiring thicker outer cowl) to the axial dimension within the inner cowl space. This dimensional repositioning allows the outer cowl to be thinner while still housing the accessory systems, thereby improving aerodynamics and fuel efficiency without compromising power transmission capability

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Loss of energy

If the outer cowl is made thinner to improve aerodynamics, then fuel efficiency improves, but space for accommodating accessory systems becomes limited

Engineering Contradiction:

Improvefuel efficiencyVSAvoidspace for accessory systems

Core Design Contradiction:

Loss of energyVSVolume of stationary object

Solution Approach 1:

The patent implements a nested configuration where the accessory gearbox is positioned within the inner cowl space, effectively nesting the accessory systems inside the existing cowl structure. This allows the outer cowl to maintain a thin, aerodynamic profile while the inner cowl provides the necessary volume for housing accessory systems and their drive mechanisms

Inventive Principle:

Principle #7Nested doll (Nesting)

3Shape

If accessory gearbox is positioned to improve aerodynamics, then outer cowl can be thinner, but power distribution to accessories becomes more complex

Engineering Contradiction:

Improveaerodynamic shape of outer cowlVSAvoidpower distribution system

Core Design Contradiction:

ShapeVSDevice complexity

Solution Approach 1:

The patent introduces a transfer gearbox as an intermediary component between the gas turbine engine and the accessory gearbox. This transfer gearbox serves as a mediator that simplifies the power distribution path by providing a dedicated interface for transmitting rotational power from the engine to the accessory systems, thereby reducing overall system complexity despite the relocated configuration

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20260015976A1Turbine engine including transfer gearbox and accessory gearbox

Publication Date: 2026.01.15 GENERAL ELECTRIC CO

AI summary

A turbine engine having an engine core that includes a compressor section, a combustion section, and a turbine section. An inner cowl circumscribes the engine core and an outer cowl radially spaced from the inner cowl, circumscribes at least a portion of the inner cowl. A transfer gearbox, at least partially located within an inner cowl space between the engine core and the inner cowl, operably couples to a first accessory device. An accessory gearbox located in the outer cowl operably couples to the transfer gearbox and a second accessory device. A heat exchanger is located radially within the inner cowl space.