Radiator Main Header Corner Stress Release
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Solution Overview
Problem
Conventional main headers for internal combustion engine radiators suffer from stress-induced deformation and seal leakage due to poor flatness resulting from the brazing process, which affects the assembly accuracy and sealing performance.
Innovation Solution
The main header design incorporates cut-outs and V-shaped notches at the corners to release stresses, combined with strengthening strips made of layered materials like silicon carbide, titanium nitride, aluminum nitride, and graphite along the length and width sides, ensuring flatness and maintaining compression with the seal ring during brazing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the edges of sheet metal are bent to form a closed half cavity at 90°, then the main header structure is formed, but stresses are introduced at the four corners causing deformation after brazing
Solution Approach 1:
The corner region is segmented by introducing cut-outs and notches that divide the continuous metal structure into distinct zones. This segmentation allows stress to be distributed and released at specific locations rather than concentrated at the corner, preventing deformation while maintaining the overall closed half cavity structure.
Solution Approach 2:
Different regions of the main header are given different structural properties. The corner regions with cut-outs and notches have modified geometry to handle stress, while the straight edges maintain the 90° bend for structural integrity. This local differentiation allows the structure to accommodate stress without compromising overall flatness.
2Ease of manufacture
If conventional sheet metal bending is used to form the main header, then manufacturing is simple, but seal leakage occurs due to poor compression of the seal ring
Solution Approach 1:
The seal ring compression is enhanced by segmenting the structure at corners with cut-outs and notches. These features create localized compression zones that ensure uniform seal ring compression around the entire perimeter, preventing leakage while maintaining the simplicity of the bending process.
Solution Approach 2:
The seal compression is optimized by providing different geometric features at corners versus straight edges. The corner notches and cut-outs create localized high-compression zones that ensure reliable sealing, while the straight edges provide consistent compression throughout, overall improving sealing performance without complicating manufacturing.
3Manufacturing precision
If strengthening strips with multiple layers are added to the main header, then flatness and sealing are improved, but device complexity increases
Solution Approach 1:
Multiple materials with different properties are combined in layered strengthening strips. Each layer (metal matrix, ceramic particles, polymer binder) contributes specific functions such as stress resistance, thermal stability, and flexibility. This composite structure maintains flatness and sealing while managing the complexity through functional integration.
Solution Approach 2:
The strengthening strips are applied locally at critical regions such as corners and along edges where stress concentration occurs. Rather than covering the entire main header, the strips are strategically positioned to provide reinforcement where needed, reducing overall complexity while maintaining flatness and sealing performance.
Data Source
AI summary
A main header for an internal combustion engine radiator has cut-outs and V-shaped notches provided at the four corners of the main header. The cut-outs and V-shaped notches release the stresses after the main header is flanged, thereby ensuring the flatness or straightness of the main header. The main header further includes one or more strengthening strips disposed along the length sides and the width sides of the main header, and optionally at the region adjacent to the cut-outs, to further enhance the flatness of the main header.