Variable Nozzle Insert Press-Fit Assembly
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Solution Overview
Problem
Existing variable nozzle devices in turbocharger systems require complex assembly processes and multiple components, which can lead to alignment issues and increased component count, affecting performance and reliability.
Innovation Solution
A variable nozzle device design featuring a wall member with an integrated insert that supports vanes rotatably about a pivot axle, allowing for press-fitting and secure alignment, reducing the number of components and simplifying assembly, while using a unison ring and tab members to actuate the vanes for adjustable geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple separate components (wall member, insert, vanes, unison ring) are used to ensure accurate alignment and secure mounting, then manufacturing precision and reliability are improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The insert is press-fitted into the wall member to form an integrated support structure, combining two components into a unified assembly. This merging maintains the alignment precision that separate components would provide while reducing the overall number of discrete parts and simplifying the device structure.
Solution Approach 2:
The insert is pre-positioned and press-fitted into the wall member before final assembly with the vanes and unison ring. This preliminary action ensures accurate alignment is established early in the assembly process, eliminating the need for complex alignment procedures during later assembly steps.
2Reliability
If multiple separate components are used to support vanes rotatably, then reliability is improved, but assembly time and productivity are reduced
Solution Approach 1:
The insert serves as a pre-assembled support structure that combines mounting features and rotational support elements. By integrating these functions into a single press-fitted component, the assembly process is accelerated while maintaining the reliability of secure vanes mounting and rotational support.
Solution Approach 2:
The insert is prepared and press-fitted into the wall member before vane installation. This preliminary assembly of the support structure eliminates the need for complex mounting procedures during vane installation, thereby improving assembly productivity while ensuring reliable rotational support.
3Ease of manufacture
If a simple press-fit connection is used between insert and wall member, then ease of manufacture is improved, but risk of component separation increases
Solution Approach 1:
The press-fit connection is designed with interference fit dimensions that create frictional retention forces before any operational loads are applied. This beforehand cushioning through dimensional design ensures component retention under operational conditions while maintaining the simplicity of the press-fit assembly process.
Solution Approach 2:
The press-fit connection parameters (interference fit dimensions, material properties) are optimized to provide sufficient retention force. By carefully selecting and controlling these parameters, the connection achieves reliable component retention while preserving the ease of manufacture associated with press-fit assembly.
Data Source
AI summary
A variable nozzle device comprises a wall member 10, a unison ring 12, and a plurality of vanes 1 rotatable about a pivot axle 8 by the unison ring 12. Each vane 1 has a tab member 9 comprising a shaft portion 6 and a tab portion 5 for holding the vanes 1 on the wall member. The nozzle device further comprises an insert 11 for supporting the vanes 1 rotatably about said pivot axle 8.