Twin Spool Turbine Power Take-Off Module
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Solution Overview
Problem
Modern turbine engines face challenges in space constraints and bulkiness when implementing power take-off systems from both high-pressure (HP) and low-pressure (LP) rotors, leading to compressor surge issues and structural clutter, particularly at low engine speeds.
Innovation Solution
A compact power take-off and transmission device using coaxial transmission shafts driven by HP and LP drive pinions, integrated with a preassembled power take-off module that simplifies installation and assembly, allowing the LP and HP rotors to share a single structural arm, reducing bulk and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power is tapped from both HP and LP rotors using traditional bulky gear sets, then power transmission capability is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent merges the power take-off mechanisms from both HP and LP rotors into a single integrated module. The module contains two pinions (first and second pinions) that engage with gears on the HP and LP shafts respectively, combining multiple power transmission functions into one compact unit. This eliminates the need for separate bulky gear sets for each rotor.
Solution Approach 2:
The power take-off module serves multiple functions simultaneously: it transmits power from both the HP rotor and LP rotor to the accessory gearbox, provides a unified mounting structure on the engine case, and integrates both power transmission paths into a single functional unit. This multi-functionality reduces overall system complexity.
2Power
If traditional power take-off arrangements are used, then power transmission is achieved, but the structural arms become cluttered and space for auxiliaries is reduced
Solution Approach 1:
The patent combines both power take-off connections into a single integrated module that mounts to one structural arm, rather than requiring separate mounting arrangements for HP and LP power take-offs. This consolidation frees up space on the structural arms for auxiliary systems.
3Power
If excessive mechanical power is tapped from HP spool, then power availability is improved, but compressor surge occurs at low speed
Solution Approach 1:
The patent implements a dynamic power distribution system where the accessory gearbox can selectively receive power from either the HP shaft or LP shaft based on operating conditions. The differential mechanism allows the system to adapt power routing dynamically, preventing compressor surge by reducing HP spool power demand when necessary while maintaining adequate power availability through LP spool contribution.
Data Source
AI summary
The invention relates to a twin spool turbine engine comprising a high-pressure rotor and a low-pressure rotor, at least one accessory gearbox, a drive means, driving coaxial transmission shafts that transmit movement to the accessory gearbox, characterized in that the drive means comprises a high-pressure drive pinion secured to the high-pressure rotor near its upstream end, a low-pressure drive pinion secured to the low-pressure rotor upstream of the high-pressure rotor, and a power take-off module in direct mesh with the drive pinions, driving the transmission shafts.By virtue of the invention, the transmission shafts run coaxial with one another and therefore pass through a single arm. The use of a power take-off module simplifies the mechanism. The turbine engine is simpler to assemble.