Ring Gear Carrier Geometry for Axial Displacement Control
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Solution Overview
Problem
Dual-flow turbomachines with high bypass ratios face issues with axial displacement of crowns due to centrifugal deformation of the crown carrier, leading to significant stresses on gear teeth during operation.
Innovation Solution
A reduction gear design featuring a crown holder with specific geometric parameters, including a ratio of radii R1/R2 between 0.3 and 0.7, angles α between 60° and 85°, and β between 150° and 175°, which secures the crown via a bolted connection, enhancing mechanical strength and limiting axial displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the crown carrier is designed with conventional geometry, then the structure is simple and easy to manufacture, but axial displacement of the crown occurs due to centrifugal deformation during operation
Solution Approach 1:
The patent applies parameter changes by optimizing the crown carrier geometry with specific angular parameters (α between 60°-85°, β between 150°-175°, and radius ratio R1/R2 between 0.3-0.7). These parameter modifications transform the conventional simple geometry into an optimized structure that resists centrifugal deformation while maintaining manufacturability, directly resolving the contradiction between reliability and device complexity.
2Reliability
If the crown carrier geometry is optimized to reduce axial displacement, then operational reliability improves, but manufacturing complexity increases
Solution Approach 1:
The optimization focuses on modifying geometric parameters (angles α and β, radius ratio R1/R2) rather than fundamentally changing the manufacturing process. These parameter changes allow the crown carrier to be fabricated using conventional methods while achieving improved performance, thus resolving the contradiction between reliability and ease of manufacture.
3Strength
If conventional crown carrier design is used, then manufacturing is easier, but centrifugal deformation causes significant stresses on gear teeth
Solution Approach 1:
The patent strengthens the gear tooth stress resistance by optimizing the crown holder structure parameters. The specific angular parameters (α: 60°-85°, β: 150°-175°) and radius ratio (R1/R2: 0.3-0.7) create a structure that better distributes centrifugal forces, reducing stress on gear teeth while maintaining reasonable structural complexity.
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 displacement of the crown, mitigating centrifugal deformation and associated stresses on the gear teeth, thereby improving the mechanical strength and operational reliability of the reducer.
Implementation Method 1
secured to the crown via a bolted connection made at a nominal radius R2 relative to the axis
Implementation Method 2
A recurring problem concerns the axial displacement of the crowns, particularly under the effect of centrifugal deformation of the crown holder during operation
Data Source
Figure 1~2
Figure 3~4
AI summary
Gearbox for a turbomachine (6) extending about a rotational axis (XX), comprising a ring gear (9) connected to a ring gear carrier (12), wherein the ring gear carrier (12) has, in a cross-sectional view along a plane including the axis (XX), an inner segment (124), an outer segment (126), and a ring gear support (128), extending successively from the inner shaft (122) to the ring gear support (128), the inner segment (124) extending to a radius R1 with respect to the axis (XX), the outer segment (126) forming an angle β with the inner segment (124), the ring gear support (128) forming an angle α with the outer segment (126), and is secured to the ring gear (9) via a bolted connection made at a nominal radius R2 with respect to the axis (XX), in that the ratio R1/R2 is between 0.3 and 0.7.