Turbocharger Variable Geometry Self-Stopper Mechanism
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Solution Overview
Problem
Existing variable geometry mechanisms for turbochargers face challenges in efficiently regulating the moving range of nozzle link plates, requiring precise positioning and increased component complexity, which affects the accuracy and reliability of the turbocharger's operation.
Innovation Solution
The proposed variable geometry mechanism incorporates a self-stopper and a fully open stopper on the drive ring and bearing housing, respectively, to regulate the moving range of nozzle link plates, with the self-stopper being integrally formed with the drive ring to reduce component count and allow for relaxed positioning accuracy, while the fully open stopper limits the moving range further, ensuring accurate operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a self-stopper is integrally formed with the drive ring to regulate the moving range of nozzle link plates, then the component count is reduced and positioning accuracy requirements are relaxed, but the moving range regulation precision may be compromised
Solution Approach 1:
The self-stopper is integrally formed with the drive ring as a single component, merging two separate parts (drive ring and stopper) into one. This reduces the total component count and eliminates the need for separate positioning and assembly of the stopper, thereby reducing device complexity while maintaining adequate positioning accuracy through the integral structure.
2Manufacturing precision
If a fully open stopper is added to limit the moving range of nozzle link plates, then the operational accuracy is improved, but the device complexity increases
Solution Approach 1:
The stopping function is segmented into two distinct components: a self-stopper for general moving range regulation and a fully open stopper for precise operational limiting. This segmentation allows each stopper to be optimized for its specific function, with the fully open stopper providing enhanced operational accuracy while the self-stopper handles broader movement control, distributing the complexity across specialized components.
3Reliability
If multiple stoppers are used to regulate the moving range of nozzle link plates, then the reliability of turbocharger operation is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The self-stopper is designed to automatically regulate the moving range of the nozzle link plates through its integral connection to the drive ring, eliminating the need for complex external control mechanisms. This self-service capability improves reliability by providing automatic movement limitation while simplifying manufacture, as the self-stopper is formed as one piece with the drive ring rather than requiring separate assembly of multiple independent components.
Data Source
AI summary
A variable geometry mechanism include an annular nozzle ring, a drive ring rotatable about a central axis of the nozzle ring, wherein the drive ring includes, a plurality of attachment portions formed on a surface of the drive ring and a self-stopper projecting from the surface of the drive ring on which the attachment portions are formed, wherein the self-stopper is located radially inward from the attachment portions so as to be closer to the central axis of the nozzle ring, a plurality of nozzle vanes rotatably coupled to the nozzle ring and a plurality of nozzle link plates extending from the nozzle ring to the drive ring, wherein the self-stopper is configured to regulate a moving range of at least one of the nozzle link plates during the rotation of the drive ring.