Aircraft Turbomachine Sun Gear Web for Balanced Tooth Loading
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Solution Overview
Problem
Existing mechanical reduction gears in turbomachines face issues with uneven force distribution and imbalance in the transmission of forces to the sun gear, leading to inhomogeneous loading and stress concentration.
Innovation Solution
The sun gear is designed with an annular web connecting inner and outer parts, providing flexibility in both radial and axial directions, allowing independent movement of rings to absorb forces during torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexibility is provided at the input shaft or intermediate connecting piece, then the ability to deform elastically is improved, but force transmission balance deteriorates
Solution Approach 1:
The sun gear is segmented into an inner ring, outer ring, and web structure. The web connects the inner and outer rings and is designed with a specific shape to provide elastic deformation capacity. This segmentation allows the sun gear to deform flexibly while maintaining balanced force transmission to the planet gears, resolving the contradiction between flexibility and force balance.
2Strength
If the sun gear is made rigid, then structural strength is improved, but inhomogeneous loading increases
Solution Approach 1:
The web of the sun gear is designed with specific geometric parameters (thickness, shape, distribution) that allow it to deform elastically under load. This parameter optimization enables the sun gear to maintain sufficient structural strength while adapting its shape to distribute forces uniformly across all planet gear contact points, preventing inhomogeneous loading.
3Force
If the web is made more flexible, then force absorption is improved, but radial and axial stability deteriorates
Solution Approach 1:
The sun gear web is designed as a composite structure combining rigid and flexible elements. The web connects the inner and outer rings with a shape that provides controlled elastic deformation in radial and axial directions. This composite design allows the web to absorb forces effectively while maintaining sufficient radial and axial stability through its geometric configuration and connection to the rigid rings.
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 design ensures even distribution of forces across the sun gear teeth, reducing stress concentrations and enhancing the mechanical efficiency of the reduction gear.
Implementation Method 1
an annular web connecting the inner and outer parts, this web being located between the inner and outer parts and having a shape giving the sun gear a capacity for deformation, for example, in bending
Data Source
AI summary
A sun gear for a mechanical gearbox of an aircraft turbomachine, the sun gear having an annular shape around an axis and including an internal annular part having at its internal periphery coupling grooves, an external annular part having at its external periphery at least one meshing tooth, the external part extending around the internal part, and an annular veil connecting the internal and external parts. At least one of the internal and external parts can include two independent rings, each having grooves or teeth, and the veil can have two annular branches connected respectively to the two rings.