V-Type Engine Cooling Duct Relocates Exhaust Heat
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Solution Overview
Problem
The rear cylinder of a V-type engine's exhaust pipe protrudes along the vehicle's width direction, causing high air temperatures near the driver's leg due to lack of cooling, especially when the motorcycle is stationary and not receiving ram air.
Innovation Solution
A cooling device with a duct and fan system that suctions heated air from the exhaust pipe and exhausts it to a distant location, using a duct inserted behind the rear cylinder and a fan that adjusts speed based on coolant temperature to lower air temperatures near the exhaust pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the exhaust pipe is placed along the vehicle body side surface, then the exhaust system is compact and integrated, but the air temperature near the driver's leg rises due to lack of cooling
Solution Approach 1:
The exhaust system is segmented into multiple sections: the exhaust pipe proper, and a separate cooling duct system. The cooling duct is positioned adjacent to the exhaust pipe to extract heat, dividing the thermal management function from the exhaust function while maintaining spatial integration
Solution Approach 2:
A cooling duct is introduced as an intermediary element between the exhaust pipe and the driver's leg area. This duct acts as a thermal barrier and heat extraction mechanism, allowing the exhaust pipe to maintain its compact placement while preventing excessive heat transfer to the driver's leg region
2Temperature
If a cooling mechanism is added to the exhaust pipe, then the air temperature near the exhaust pipe is lowered, but the device complexity increases
Solution Approach 1:
The cooling duct is merged with the vehicle body structure or existing framework components rather than being a completely separate assembly. This integration approach provides cooling functionality while minimizing additional structural complexity and maintaining a compact overall design
Solution Approach 2:
The cooling mechanism utilizes pneumatic principles by employing airflow through the cooling duct to extract heat from the exhaust pipe. This passive or actively-controlled airflow system provides efficient thermal management without requiring complex mechanical cooling components
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
Effectively reduces air temperature near the exhaust pipe and driver's leg by circulating cooler air and efficiently managing fan operation to conserve energy.
Implementation Method 1
a fan which causes air heated by the exhaust pipe to be suctioned into an interior of the duct through the suction port and exhausts the suctioned heated air to a location distant from the exhaust pipe
Data Source
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AI summary
A cooling device 1 is incorporated into a V-type engine E in which a front cylinder 12 and a rear cylinder 13 are arranged in V-shape and a rear exhaust pipe 18R is placed at a right side of a vehicle body 8. The cooling device 1 includes an intake duct 24 and a fan 25. The intake duct 24 has a suction port 28 which opens toward the rear exhaust pipe 18R. The fan 25 suctions the air into the interior of the intake duct 24 through the suction port 28 and exhausts the suctioned air to a location distant from the exhaust pipe 18R.