Ring Gear Carrier Geometry for Axial Movement Control
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Solution Overview
Problem
Existing reduction gears in double flow turbomachines face issues with axial movement of ring gears due to centrifugal deformation, leading to stress on gear teeth during operation.
Innovation Solution
A reduction gear design featuring a ring gear carrier with specific geometric parameters, including internal and external segments and a ring gear support, secured by a bolted connection, where the ratio of radii R1/R2 is between 0.3 and 0.7, and angles α and β are between 60°-85° and 150°-175° respectively, enhancing mechanical strength and limiting axial movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional ring gear carrier design is used, then the structure is simple, but axial movement of the ring gear occurs due to centrifugal deformation
Solution Approach 1:
The ring gear carrier is divided into multiple segments including an internal segment, an external segment, and a ring gear support segment. Each segment serves a specific function in distributing and managing centrifugal forces, thereby reducing axial movement while maintaining structural clarity and manageable complexity.
Solution Approach 2:
The invention introduces angular parameters (α and β) to define the orientation of carrier segments relative to each other. By optimizing the spatial arrangement in multiple dimensions, the carrier effectively resists centrifugal deformation and controls axial movement without requiring excessive structural complexity.
2Strength
If the ring gear carrier is designed with specific geometric parameters, then mechanical strength is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention specifies optimal ranges for geometric parameters (R1/R2 ratio between 0.3-0.7, angle α between 60°-85°, angle β between 150°-175°) rather than exact values. This approach maximizes mechanical strength while providing manufacturing tolerances that reduce precision requirements compared to overly specific dimensional constraints.
3Reliability
If the ring gear support is secured with a bolted connection at nominal radius R2, then the ring gear is firmly retained, but stress concentration may occur at the connection point
Solution Approach 1:
The ring gear support segment is designed with specific angular orientation (α between 60°-85° relative to the external segment) to optimize the distribution of stresses at the bolted connection point. This localized geometric optimization reduces stress concentration while maintaining firm ring gear retention through the bolting arrangement.
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 proposed design effectively reduces axial movement and stress on gear teeth by improving mechanical strength, addressing the centrifugal deformation issue and enhancing operational stability.
Implementation Method 1
One recurring problem relates to the axial movement of ring gears, particularly under the influence of the centrifugal deformation of the ring gear carrier during operation.
Data Source
AI summary
A reduction gear for a turbomachine (6) extending around an axis (X-X) of rotation, comprising a ring gear (9) connected to a ring gear carrier (12), wherein the ring gear carrier (12) has, according to a section view along a plane including the axis (X-X), an internal segment (124), an external segment (126) and a ring gear support (128), extending successively from the internal shaft (122) until the ring gear support (128), the internal segment (124) extends until a radius R1 with respect to the axis (X-X), the external segment (126) forms an angle β with the internal segment (124), the ring gear support (128) forms an angle α with the external segment (126), and is secured to the ring gear (9) via a bolted connection accomplished at a nominal radius R2 with respect to the axis (X-X), in that the ratio R1/R2 is comprised between 0.3 and 0.7.