Variable Nozzle Segmented Shaft Torque Transmission
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Solution Overview
Problem
Existing turbine engine variable nozzle systems face durability, leakage, constructability, and installation issues due to challenges in translating torque from driver arms to nozzle airfoils, limiting their performance and efficiency across varying operational conditions.
Innovation Solution
A variable nozzle assembly with a segmented shaft and connectors, including spherical bearings and universal joints, that translates torque between segments to rotate the nozzle airfoil, enhancing durability and reducing rotational binding under heavy loads while maintaining efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a segmented shaft with spherical bearings and universal joints is used to translate torque from driver arm to nozzle airfoil, then durability and resistance to rotational binding under heavy loads are improved, but device complexity increases
Solution Approach 1:
The shaft is divided into multiple segments (first segment, second segment, third segment) connected by universal joints. This segmentation allows each segment to independently handle torque transmission while accommodating misalignment and thermal expansion, thereby improving durability and reducing rotational binding under heavy loads despite increasing component count
Solution Approach 2:
Spherical bearings are introduced as intermediary elements between the shaft segments and the driver arm/nozzle airfoil connections. These bearings act as mediators that facilitate smooth torque transmission while accommodating angular misalignments, reducing friction and preventing binding under varying operational conditions
2Productivity
If variable nozzles are rotated to control flowpath geometry for enhanced efficiency, then productivity and efficiency over wider operability range are improved, but leakage and durability issues arise from the torque translation mechanism
Solution Approach 1:
The torque translation mechanism is segmented into multiple sections (driver arm, segmented shaft, connectors) with distinct functional zones. This segmentation isolates potential leakage paths to specific components while maintaining the overall rotational control capability for flowpath geometry adjustment across different operating conditions
Solution Approach 2:
The patent employs replaceable seals and bearing surfaces in the connector assemblies that can be easily replaced if worn or damaged. This approach addresses durability and leakage issues by providing affordable, replaceable components rather than requiring a completely redesigned torque translation system
3Ease of manufacture
If existing torque translation assemblies are used in variable nozzle systems, then constructability and installation are simplified, but durability and leakage problems occur under operational conditions
Solution Approach 1:
The torque translation assembly is divided into modular segments (first segment with driver arm, second segment with shaft, third segment with connectors) that can be manufactured separately and assembled. This modular segmentation improves constructability by allowing parallel production while enhancing durability through standardized, replaceable connection interfaces
Solution Approach 2:
The connector assemblies with spherical bearings serve multiple functions: torque transmission, misalignment accommodation, and sealing. This multi-functionality reduces the need for separate dedicated components, simplifying construction while maintaining durability through integrated design
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 solution improves the durability and constructability of variable nozzle assemblies, reduces leakage, and facilitates efficient installation, ensuring consistent performance and reduced variability in output across a range of operational conditions.
Implementation Method 1
The first and second connector may include first and second spherical bearings, respectively
Implementation Method 2
The third connector may include a first universal joint
Data Source
AI summary
A turbine engine having a variable nozzle assembly that includes: a variable nozzle having an airfoil that extends radially across an annulus formed between inner and outer platforms; and a segmented shaft that translates a torque between segments included therewithin. The segmented shaft may include a first and second segment. The first segment of the segmented shaft may include: the airfoil of the variable nozzle; an outer stem extending from the outer end of the airfoil; and an inner stem extending from the inner end of the airfoil. A first and second connector may connect the first segment to the inner platform and outer platform, respectively. A third connector may connect the first segment to the second segment. The first and second connector may include a first and second spherical bearing, respectively. The third connector may include a first universal joint.