Integrated Vane Stops for Variable-Geometry Turbocharger
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Solution Overview
Problem
Current Variable Turbine Geometry (VTG) turbochargers face challenges in maintaining consistent full open position of guide vanes, leading to variations in flow rate and efficiency due to stackup clearances and component tolerances, which can result in insufficient maximum flow capacity.
Innovation Solution
Integration of a vane-open stop mechanism into the vane lever, allowing adjacent vanes to stop against each other or the upper vane ring, with modified actuator learning software to ensure consistent control of the full open position and minimize clearance stackup, thereby regulating maximum exhaust gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional VTG turbochargers use adjustable guide vanes without integrated stops, then the mechanism allows flexible exhaust gas flow control, but the full open position varies due to stackup clearances and component tolerances
Solution Approach 1:
The patent merges the vane lever and stop into a single integrated component called the vane-open stop. This integration eliminates the separate stop component and its associated clearances, ensuring that the full open position is determined solely by the precise geometry of the integrated stop feature, thereby eliminating variation due to separate component stackup.
Solution Approach 2:
The integrated vane-open stop is designed with predetermined geometry during manufacturing to establish the exact full open position. This preliminary positioning action eliminates the need for field adjustment and ensures consistent full open position across all turbochargers, as the stop feature is built-in with precise dimensions rather than relying on assembly tolerances.
2Reliability
If separate stop components are used to define full open position, then the stop function can be provided, but clearance stackup between components causes variation in vane travel
Solution Approach 1:
The patent combines the vane lever and stop into one integrated component, reducing the total number of parts. This merger eliminates the interface clearances between separate components, thereby eliminating stackup variation while simultaneously reducing device complexity by removing the separate stop component.
Solution Approach 2:
The patent extracts the stop function from a separate component and integrates it directly into the vane lever. This extraction of the stop function from a discrete part and its incorporation into the existing vane lever structure eliminates the need for separate stop components and their associated clearances.
3Productivity
If guide vanes are allowed to pivot freely without integrated stops, then the mechanism maintains simple structure, but maximum flow capacity is insufficient due to clearance stackup
Solution Approach 1:
The patent merges the stop function into the vane lever structure, creating the integrated vane-open stop. This integration ensures that the full open position is precisely controlled by the geometry of the integrated feature rather than by clearance stackup, thereby maximizing exhaust gas flow capacity without adding significant structural complexity.
Data Source
AI summary
A variable-geometry turbocharger (1) with a vane lever (11) that provides a stop function at full open position of the guide vanes (8). The integrated vane-open stop controls the full open position of the VTG mechanism. A vane lever (11) preferably has an integrated protrusion (50) that functions as a vane-open stop that contacts an adjacent vane lever (11), an integrated bolt (56), or the upper vane ring (16) at the full open position to regulate maximum exhaust gas flow to the turbine wheel (5).