Aircraft Turbine Gear Reducer Oil Distributor Sealing
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Solution Overview
Problem
The existing mechanical reduction gears in turbomachines, particularly in aircraft, face challenges in maintaining a secure seal between the stator and rotor parts of the lubricating oil distributor due to relative displacements and tilting during operation, which affects the efficient lubrication and performance of the gearbox.
Innovation Solution
The integration of an annular oil deflector with the stator part of the distributor, which not only captures and guides lubricating oil but also stabilizes the stator part, limiting relative movements and ensuring a secure seal between the stator and rotor parts, thus enhancing the sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stator part of the distributor is immobilized by connecting rod to a stator casing, then the stator part can be positioned, but relative displacements and tilting occur during operation compromising the seal
Solution Approach 1:
The patent merges the stator part of the distributor with the sun gear by integral connection. This eliminates the need for separate connecting rods and stator casing attachments, while ensuring the stator part moves synchronously with the sun gear without relative displacements or tilting, thereby maintaining reliable sealing between stator and rotor parts.
Solution Approach 2:
The sun gear is given a dual function: it not only transmits mechanical power as part of the planetary gear system but also serves as the mounting structure for the stator part of the distributor. This multi-functionality eliminates the need for separate structural components while ensuring synchronized movement and reliable sealing.
2Ease of operation
If the stator part moves and tilts relative to the reduction gear to follow rotor part movements, then the distributor can adapt to operation, but sealing between stator and rotor parts is compromised
Solution Approach 1:
By integrating the stator part with the sun gear, the patent ensures that the stator part automatically follows the movement of the rotor part through the synchronized rotation of the planetary gear system. This eliminates relative tilting and displacements while maintaining adaptability to operational conditions.
Solution Approach 2:
Instead of allowing the stator part to move independently to follow rotor movements, the patent inverts the approach by making the stator part integral to the sun gear, so that both parts move together as a unified system, eliminating sealing issues while maintaining operational adaptability.
3Manufacturing precision
If connecting rod is used to immobilize stator part, then positioning is achieved, but relative displacements occur during operation
Solution Approach 1:
The patent eliminates the connecting rod structure and integrates the stator part directly with the sun gear. This integral connection ensures precise positioning is maintained during operation without relative displacements, as both parts move together as a single unified component.
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
This solution effectively maintains a secure seal between the stator and rotor parts, ensuring reliable lubrication and improved performance of the gearbox by preventing relative displacements and tilting, and is compatible with various gearbox architectures and bearing types.
Implementation Method 1
the deflector has a single function of capturing and guiding the oil projected radially outwards
Implementation Method 2
The stator part of the distributor cooperates in sealing with the rotor part, this sealing having to be guaranteed whereas the stator part must in operation move and tilt relative to the reduction gear
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Mechanical reducer (6) of turbomachine, in particular of aircraft, this reducer comprising: - a sun having an axis of rotation, - a ring (9) which extends around the sun and which is configured to be fixed in rotation about said axis, - satellites which are meshed with the sun and the ring and which are held by a satellite carrier which is configured to be mobile in rotation about said axis, - at least one lubricating oil distributor which includes a stator part (15) fixed in rotation and a rotor part (14) fixed in rotation to said satellite carrier, and - an annular oil deflector (26) which is fixed to the ring, characterized in that said stator part is fixed to said deflector.