Doser Mounting Bracket Thermal Isolation via Air Pockets
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Solution Overview
Problem
Existing doser mounting systems for exhaust gas aftertreatment systems in internal combustion engines face challenges in reducing heat transfer from the exhaust gas aftertreatment system components to the doser, which can negatively impact doser performance and cause structural issues due to heat-induced stress.
Innovation Solution
A doser mounting bracket is designed with a central structure and attachment structure that creates air pockets between the doser and the exhaust gas aftertreatment system components, utilizing thermal barriers like air gaps and potentially thermally insulating materials to mitigate heat transfer, while also featuring a centering structure for accurate alignment and secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the doser is directly attached to the exhaust gas aftertreatment system component, then the mounting structure is simple and cost-effective, but heat transfer from the component to the doser increases, negatively impacting doser performance and causing structural issues
Solution Approach 1:
A mounting bracket is introduced as an intermediary component between the doser and the exhaust gas aftertreatment system component. The bracket includes a first portion attached to the component and a second portion attached to the doser, with a thermal barrier positioned between these portions to reduce heat transfer while maintaining mechanical coupling.
Solution Approach 2:
The mounting bracket is divided into distinct segments: a first portion for attachment to the exhaust component, a second portion for attachment to the doser, and a thermal barrier segment between them. This segmentation allows each portion to perform its specific function while collectively solving the heat transfer problem.
2Ease of operation
If the doser is directly attached to the exhaust gas aftertreatment system component, then the installation is straightforward, but heat-induced stress causes structural issues and warping
Solution Approach 1:
The mounting bracket serves as a mediator that protects the joint between the doser and the exhaust component from heat-induced stress. By positioning the thermal barrier within the bracket structure, the joint is shielded from thermal effects while maintaining secure attachment.
3Temperature
If a thermal barrier is introduced between the doser and the exhaust gas aftertreatment system component, then heat transfer to the doser is reduced, but the mounting structure becomes more complex
Solution Approach 1:
The mounting bracket combines multiple functions into a single integrated structure: mechanical attachment (first and second portions) and thermal isolation (thermal barrier). This merging reduces the number of separate components needed while achieving both mounting and heat protection objectives.
Solution Approach 2:
The mounting bracket is designed as a multi-functional component that simultaneously provides mechanical support, positioning, and thermal protection. The single bracket structure performs multiple roles that would otherwise require separate components, simplifying the overall assembly.
4Reliability
If a thermal barrier is introduced between the doser and the exhaust gas aftertreatment system component, then doser performance is improved, but manufacturing costs increase
Solution Approach 1:
The mounting bracket merges the thermal barrier function with the mounting structure, eliminating the need for separate thermal insulation components. This integration reduces the total number of parts, simplifies assembly, and lowers manufacturing costs while maintaining doser performance protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively maintains the doser at lower temperatures, reducing heat-induced stress and improving performance, while facilitating reliable and cost-effective installation by minimizing warping and allowing for a one-piece construction of the mounting bracket.
Implementation Method 1
The engagement wall is configured to separate the lower surface from the sidewall when the engagement wall interfaces with the sidewall such that a pocket is formed between the engagement wall, the centering structure, and the lower surface
Data Source
AI summary
A doser mounting bracket for coupling a doser to an exhaust gas aftertreatment system component having a sidewall and an exhaust gas aftertreatment system component opening includes a lower surface, an engagement wall, a central structure, an upper surface, and an attachment structure. The lower surface is configured to be held in a position opposing the sidewall. The engagement wall extends from the lower surface. The central structure has an opening that extends therethrough and includes a centering structure that extends from the lower surface and is configured to be received within the exhaust gas aftertreatment system component opening. The attachment structure extends from the upper surface and is configured to be coupled to the doser. The engagement wall is configured to separate the lower surface from the sidewall when the engagement wall interfaces with the sidewall such that a pocket is formed between the engagement wall, the centering structure, and the lower surface.