Motorcycle Exhaust Pipe Width-Extending Portion Layout
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Solution Overview
Problem
Existing exhaust gas purifying apparatuses for motorcycles face challenges in achieving optimal catalyst performance, aerodynamics, and reduced dimensions, as catalyst placement affects activation temperature and exhaust gas flow resistance, leading to overheating and increased motorcycle width.
Innovation Solution
The exhaust gas purifying apparatus features a main exhaust gas pipe with a width-extending portion behind the engine, allowing for catalyst placement that maintains optimal temperature and reduces overall width, while enabling flexible pipe shaping and simplified assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If catalysts are placed close to the main engine to reduce activation temperature, then catalyst activation is improved, but the catalysts become overheated and lose effectiveness
Solution Approach 1:
The exhaust gas pipe is configured to extend in the width direction of the motorcycle rather than solely in the longitudinal direction. This dimensional change allows the catalyst receiving portion to be positioned laterally away from the engine heat source while maintaining proximity to the exhaust outlet, thus resolving the contradiction between needing heat for activation and avoiding overheating.
Solution Approach 2:
The exhaust gas pipe is divided into multiple detachable portions that can be connected by joint members. This segmentation allows flexible arrangement of the pipe sections to optimize the catalyst positioning, enabling the system to achieve both adequate heat exposure for activation and sufficient distance from excessive heat sources.
2Ease of manufacture
If a rectilinear catalyst receiving portion is provided in the main exhaust gas pipe, then catalyst installation is enabled, but the overall dimension and width of the motorcycle increase
Solution Approach 1:
Instead of extending the catalyst receiving portion in the longitudinal direction (which would increase motorcycle length), the design extends it in the width direction. This dimensional reorientation allows the catalyst to be installed without significantly increasing the motorcycle's overall length, while the lateral extension provides sufficient space for the rectilinear catalyst receiving portion.
Solution Approach 2:
The use of detachable portions connected by joint members provides assembly flexibility, allowing the exhaust gas pipe to be configured adaptively to fit within the motorcycle's spatial constraints while still providing the necessary rectilinear portion for catalyst installation.
3Ease of operation
If the main exhaust gas pipe is made detachable with several portions and joint members, then assembly flexibility is improved, but the device complexity increases
Solution Approach 1:
The exhaust gas pipe is segmented into multiple detachable portions that can be assembled using standard joint members. This segmentation provides assembly flexibility and allows the pipe to be configured to accommodate the catalyst receiving portion in optimal positions, while the modular nature keeps the complexity manageable through standardized connections.
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 ensures effective catalyst performance without overheating, maintains engine output, and reduces motorcycle width, while allowing for improved aerodynamics and easier assembly.
Implementation Method 1
The catalysts are located inside the main exhaust gas pipe, the function of said catalysts (one or more depending on the exigencies and/or circumstances) being that of collecting and trapping the pollutant components of the exhaust gases
Implementation Method 2
the temperature of the catalysts may be influenced by the heat generated by the main engine and dissipated to the outside
Data Source
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AI summary
An exhaust pipe 30 has a front-back extending portion 42 extending rearward on one side of the engine 3 in a vehicle width direction and a vehicle-width extending portion 43 extending from the front-back extending portion 42, passing behind the engine 3, extending to the other side and a catalyst 51 is disposed in the vehicle-width extending portion 43.