Motorcycle Cooling Pipe Routing Between Exhaust and Crankcase
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Solution Overview
Problem
Motorcycles with multi-cylinder engines face limitations in bank angle during high-speed turns due to the curvature of cooling liquid pipes, which can decrease cooling efficiency and restrict turning stability.
Innovation Solution
The cooling liquid pipe is routed to pass through the space between the crankcase and exhaust pipes, curving inward to connect the radiator, allowing for a larger bank angle without significantly reducing cooling efficiency, and can be made of resin to reduce weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling liquid pipe is curved outward at the front end of the crankcase to connect the radiator, then the cooling efficiency is maintained, but the bank angle is limited
Solution Approach 1:
The cooling liquid pipe is routed through the space between the crankcase and exhaust pipes, utilizing the vertical dimension and spatial arrangement rather than curving outward horizontally. This dimensional repositioning allows the pipe to connect the radiator while clearing the exhaust pipes, thereby enabling larger bank angles without compromising cooling efficiency
2Adaptability or versatility
If the cooling liquid pipe is arranged in the space between the crankcase and exhaust pipes, then the bank angle is increased, but the cooling efficiency may decrease due to high temperature
Solution Approach 1:
The pipe routing through the space between the crankcase and exhaust pipes converts the previously harmful high-temperature zone into a beneficial space utilization opportunity. By carefully positioning the pipe in this gap, the design achieves larger bank angles while the pipe itself does not significantly absorb heat that would compromise cooling efficiency, as the space is naturally cooled by air flow during operation
3Weight of moving object
If the cooling liquid pipe is made of resin to reduce weight, then the overall weight is decreased, but the heat resistance may be insufficient
Solution Approach 1:
The patent specifies using resin material for the cooling liquid pipe, representing a parameter change from traditional metal materials. This material substitution reduces weight while the specific resin composition and pipe design maintain sufficient heat resistance for the application, balancing weight reduction with thermal performance requirements
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 enables motorcycles to maintain high cooling efficiency and stability at larger bank angles, improving turning performance while minimizing weight.
Implementation Method 1
cooling water circulates between the engine and a radiator
Implementation Method 2
cooling water circulates between the engine and a radiator
Implementation Method 3
cooling water circulates between the engine and a radiator
Data Source
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AI summary
A plurality of exhaust pipes are respectively connected to a plurality of exhaust ports of a cylinder head. The plurality of exhaust pipes are arranged in a left-and-right direction to be spaced apart from one another and pass in front of and below a crankcase from the cylinder head to extend rearward. A first pipe that connects a water pump to a radiator extends forward at the right of a right side surface portion to a front surface portion of the crankcase and is curved leftward from the right of the right side surface portion in a front view of a motorcycle. Further, the first pipe passes through an inner region between a left end and a right end of the plurality of exhaust pipes to be connected to the radiator in the front view of the motorcycle.