V-Type Engine Carburetor Heat Shielding via Resin Plates
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Solution Overview
Problem
V-type engines face difficulties in restarting in high-temperature states due to heat retention in the carburetor, leading to percolation issues, as conventional thin insulators provide inadequate heat shielding.
Innovation Solution
The implementation of synthetic resin heat shield plates attached to the side faces of the engine banks, which guide cooling air and shield the carburetor from radiation heat, combined with longer intake pipes to reduce heat conduction, and an integral connection to form a single component for easier installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If thin insulators are used to join the carburetor to the banks, then the device complexity is reduced, but the heat shield capability is insufficient causing percolation
Solution Approach 1:
The patent uses composite insulation structures combining heat-resistant materials with reflective heat shield flanges. The insulator integrates a heat shield flange that extends vertically to block radiant heat, creating a composite thermal protection system that maintains carburetor temperature while preserving structural simplicity
Solution Approach 2:
The heat shield flange acts as an intermediary element between the hot bank and the carburetor. It blocks thermal radiation pathways and redirects heat flow away from the carburetor, preventing direct heat transfer while maintaining the simple insulator-based joining structure
2Device complexity
If the carburetor is placed close to the banks in the valley, then the device complexity is reduced, but the temperature increases causing percolation
Solution Approach 1:
The carburetor is extracted from the immediate valley space between the banks and repositioned higher, away from the primary heat zones. This spatial extraction reduces exposure to radiant heat while maintaining a relatively simple overall engine structure
Solution Approach 2:
Heat shield flanges and insulators serve as intermediary thermal barriers between the banks and carburetor, allowing the carburetor to be positioned closer to banks while still protecting it from excessive heat through these intermediate protective elements
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
This solution effectively prevents carburetor heating and percolation, enhancing engine restartability in high-temperature states while simplifying the engine structure and reducing component complexity.
Implementation Method 1
the first and second heat shield plates interposed between the corresponding first and second banks and the carburetor shield the carburetor from radiation heat from the banks
Implementation Method 2
cooling air is guided into the cooling air passage while the V-type engine is in operation. Thereby, the banks can be cooled
Data Source
AI summary
In a V-type engine in which first and second banks arranged in a V-shape are provided continuously to a crankcase, and in which a carburetor is placed at a valley between the first and second banks, the carburetor is placed spaced from the first and second banks. Further, the carburetor is connected to intake ports of the first and second banks via first and second intake pipes, respectively, and first and second heat shield plates each made of synthetic resin are attached to side faces of the respective first and second banks, the side faces facing the carburetor, each of the first and second heat shield plates covering a corresponding one of the side faces and defining a cooling air passage between the heat shield plate and the side face. Accordingly, it is possible to surely prevent heat from the banks from affecting the carburetor in order to prevent percolation in the carburetor even in the case where the engine stops its operation in a high-temperature state.