Exhaust Gas Purification Insert Spherical Mounting
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Solution Overview
Problem
Existing exhaust gas treatment devices face challenges in mountability due to manufacturing tolerances, which can lead to alignment issues and increased production costs.
Innovation Solution
Designing the end sections and opening edges of the exhaust gas purification insert as spherical shell segments, allowing for adjustable axial alignment and tolerance compensation, enabling easier assembly and potentially less expensive production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cylindrical opening edges and end sections are used with constant cross section, then the manufacturing process is simple, but manufacturing tolerances cause alignment issues and reduced mountability
Solution Approach 1:
The patent applies spherical shell segments instead of cylindrical surfaces with constant cross-section. The opening edge and end section are designed with curved spherical surfaces that allow rotational movement during assembly, enabling automatic alignment and compensation of manufacturing tolerances. This curvature provides a self-aligning mechanism that maintains precise positioning despite tolerance variations.
Solution Approach 2:
The spherical design introduces dynamic adjustment capability during the assembly process. The opening edge and end section can rotate relative to each other along the spherical surface, allowing the system to adapt to tolerance deviations and achieve proper alignment. This dynamic movement during assembly transforms a static fit into an adaptive connection that compensates for manufacturing variations.
2Manufacturing precision
If spherical shell segments are used for end sections and opening edges, then tolerance compensation and mountability are improved, but manufacturing complexity increases
Solution Approach 1:
While spherical surfaces are more complex than cylindrical ones, the patent applies them only to the critical interface areas (opening edge and end section) rather than the entire component. This localized application of curvature provides the necessary alignment functionality while minimizing overall manufacturing complexity. The spherical segments are designed with appropriate radii that balance precision requirements with manufacturability.
3Manufacturing precision
If manufacturing tolerances are tightened to ensure precise alignment, then assembly precision is improved, but production costs increase
Solution Approach 1:
The spherical design incorporates built-in tolerance compensation that acts as a cushion against manufacturing variations. By designing the interface with spherical geometry, the system anticipates and accommodates tolerance deviations without requiring extremely tight manufacturing specifications. This beforehand cushioning allows standard tolerances to be used while still achieving precise alignment, thereby reducing production costs.
Solution Approach 2:
The spherical geometry changes the functional parameters of the interface from rigid cylindrical contact to flexible spherical contact. This parameter change allows the system to tolerate larger dimensional variations while maintaining alignment precision. The spherical surface provides a range of motion that accommodates tolerance deviations, effectively decoupling assembly precision from manufacturing precision requirements.
Data Source
AI summary
An exhaust gas treatment device for an exhaust system of an internal combustion engine includes a housing that is adapted to be tied into the exhaust system and at least one exhaust gas purification insert arranged in the housing. The exhaust gas purification insert includes an insert housing which is open at one end and at least one exhaust gas purification element arranged in the insert housing. The housing has at least one insert bracket which has at least one mounting opening on whose opening edge is supported an end section of the insert housing in the form of a ring. The end section forms a first spherical shell segment and the opening edge forms either a second spherical shell segment that is complementary to the first spherical shell segment or a conical jacket segment that fits the first spherical shell segment.