Exhaust Panel Thermal Insulation via Adhesive Bonding
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Solution Overview
Problem
Existing exhaust pipe end panels for motor vehicles fail to effectively cover the visible end of the exhaust pipe, leading to direct heat transfer from high-temperature exhaust gases to the panel, which limits material choices and increases costs due to the need for extremely temperature-resistant plastics.
Innovation Solution
A device with a base support and panel connected by gluing, featuring a heat shield on the inside of the base support and an air catcher to reduce heat transfer, using a bead of adhesive for connection and allowing airflow to cool the panel, thereby minimizing contact points and thermal load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the panel is directly contacted with the base support, then the structural strength is improved, but the heat transfer from the base support to the panel increases
Solution Approach 1:
An adhesive layer is introduced as an intermediary substance between the base support and the panel. This adhesive serves as a thermal insulator while maintaining the mechanical connection, thereby reducing heat transfer from the hot base support to the panel without compromising structural strength.
Solution Approach 2:
The thermal conductivity parameter of the connection interface is changed by using an adhesive material with low thermal conductivity. This transforms the direct thermal contact into a thermally resistant connection, allowing the panel to remain cooler while maintaining structural integrity.
2Temperature
If high-temperature-resistant plastics are used for the panel, then the temperature resistance is improved, but the manufacturing cost increases
Solution Approach 1:
The adhesive acts as a thermal barrier that protects the panel from high temperatures. This allows the use of standard, cost-effective plastics for the panel instead of expensive high-temperature-resistant materials, as the adhesive layer prevents heat from reaching the panel.
Solution Approach 2:
Instead of using expensive high-temperature-resistant plastics for the panel, the invention uses a combination of standard plastics and a thermal insulating adhesive. This substitutes costly materials with a more economical combination of materials that achieves the same thermal protection function.
3Shape
If the visible end of the exhaust pipe is not covered, then the exhaust pipe is visible, but the heat transfer to the panel increases
Solution Approach 1:
The adhesive layer serves as a thermal intermediary between the exhaust pipe/base support and the panel. It allows the panel to cover the visible end of the exhaust pipe for aesthetic purposes while simultaneously blocking heat transfer from the hot exhaust components to the panel.
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 reduces heat transfer to the panel, allowing the use of economically viable plastics, providing a high-quality visual appearance while reducing material costs and weight, with potential weight savings of 30-50% compared to stainless steel variants and a cost reduction of over 200% compared to prior plastic solutions.
Implementation Method 1
Gluing offers the advantage that there is little heat transfer from the base support to the panel glued to it
Implementation Method 2
a heat shield is arranged on the inside of the base support, resulting in improved protection against thermal loading of the exhaust gas flow
Implementation Method 3
The air catcher enables airflow to be fed into the device, namely in the area between the exhaust and the base support. This leads to a reduction in the exhaust gas temperature flowing through the device
Data Source
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AI summary
The invention relates to a device (1) for covering the visible end of the exhaust (2) of a motor vehicle, comprising a base carrier (3) and a cover (4), wherein the base carrier (3) and cover (4) are made of plastic and the cover (4) forms the visible end, wherein the connection between the base carrier (3) and the cover (4) is made by bonding, wherein a heat shield (9) is arranged on the inside of the base carrier (3).