Wind Exhaust Duct for Internal Combustion Engine Cooling
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Solution Overview
Problem
Internal combustion engines face limitations in enhancing cooling performance due to restricted wind volume through the radiator, especially when the radiator is arranged laterally to the engine main body, and the wind exhaust duct's compact arrangement is hindered by the fender, leading to reduced cooling efficiency and potential foreign material ingress.
Innovation Solution
The wind exhaust duct is strategically arranged on the upper portion of the crankcase, extending along the rotational axis and coupled with the fender to direct exhausted wind between the wheel and fender, utilizing the fender's opening to bypass obstructions and incorporate a shielding part to prevent foreign material entry, thereby increasing wind volume and maintaining compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the passage area of the wind outlet portion is increased to increase wind volume, then cooling performance improves, but the shroud cannot ensure sufficient rigidity to support the radiator
Solution Approach 1:
The wind exhaust duct is arranged on the upper portion of the crankcase, utilizing the vertical space above the crankcase instead of expanding the horizontal passage area in the shroud. This dimensional relocation allows the shroud to maintain its structural integrity while still providing an adequate exhaust path for cooling wind, thereby resolving the contradiction between wind volume and shroud rigidity.
2Quantity of substance
If the wind exhaust duct is arranged to extend in the front and back direction to increase wind volume, then cooling performance improves, but the duct becomes close to the fender and smooth exhaust is inhibited
Solution Approach 1:
Instead of extending the wind exhaust duct in the front-back direction where it would interfere with the fender, the duct is arranged on the upper portion of the crankcase, utilizing the vertical and lateral space above the crankcase. This repositioning in a different spatial dimension allows the duct to maintain adequate passage area for high wind volume while avoiding interference with the fender, ensuring smooth exhaust flow.
3Adaptability or versatility
If the radiator is arranged lateral to the engine main body, then mounting flexibility improves, but traveling wind cannot effectively cool the radiator
Solution Approach 1:
The wind exhaust duct acts as an intermediary structure that actively manages cooling wind flow. By arranging the duct on the upper portion of the crankcase and directing exhaust wind toward the radiator, the system compensates for the reduced natural cooling effect from traveling wind. The duct mediates between the lateral mounting configuration and the cooling requirement, ensuring adequate heat dissipation despite the altered radiator position.
4Volume of moving object
If the wind exhaust duct is arranged avoiding the fender to maintain compactness, then device size is reduced, but passage area is limited and wind volume decreases
Solution Approach 1:
The wind exhaust duct utilizes the vertical space above the crankcase rather than extending horizontally where space is constrained by the fender. By relocating the duct to the upper portion of the crankcase, the design achieves adequate passage area for high wind volume while maintaining a compact overall arrangement that avoids fender interference. This dimensional relocation allows both compactness and sufficient wind volume to be achieved simultaneously.
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 configuration enhances the cooling performance of the radiator by increasing wind volume, preventing wind recirculation, and ensuring smooth exhaust while minimizing the duct's size and avoiding fender interference, thus improving both radiator and crankcase cooling efficiency.
Implementation Method 1
a cooling fan 53 for generating cooling wind for cooling the cooling water
Implementation Method 2
a radiator 52 through which the cooling water for cooling the cylinder block and the cylinder head flows
Implementation Method 3
the exhausted wind flows along the outer surface of the crankcase, whereby the cooling effect of the crankcase by the exhaust wind is enhanced
Data Source
Figure 1
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Figure 3
AI summary
To increase the wind volume of the cooling wind flowing through a radiator and to enhance the cooling performance of the radiator (52) by providing a wind exhaust duct (70, 80) using a crankcase (23) of an internal combustion engine (E). A cooling device (50) of the internal combustion engine (E) includes a radiator (52) arranged lateral to crankcases (23a, 23b), and a wind exhaust duct (70) for exhausting the cooling wind passed through the radiator (52) to the atmosphere. The wind exhaust duct (70) is arranged extending along a rotational axis of the crankshaft at the upper portion of the crankcases (23a, 23b) and the upper portion of the transmission case (16).