Motorcycle Exhaust Connection Pipe Vertical Positioning
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Solution Overview
Problem
The existing exhaust system for motorcycles struggles to secure a sufficient bank angle without reducing the exhaust gas passage area, as the connection pipe often contacts the ground, and reducing its diameter compromises engine output characteristics.
Innovation Solution
The exhaust system positions the connection pipe within an area enclosed by bank angle lines and the engine's bottom surface, ensuring the bank angle is maintained while maximizing the cross-sectional area by having parts of the connection pipe contact the bank angle lines, thus avoiding ground contact and enhancing exhaust gas emission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the connection pipe diameter is reduced to avoid ground contact, then the bank angle is improved, but the exhaust gas passage area is reduced
Solution Approach 1:
The connection pipe is repositioned from a horizontal arrangement to a vertical arrangement, utilizing the vertical dimension beneath the engine. This dimensional change allows the pipe to clear the ground contact area while maintaining its diameter and exhaust passage area, resolving the contradiction between bank angle and passage area.
Solution Approach 2:
The engine body serves as an intermediary structure that the connection pipe passes through or alongside. By routing the pipe through the vertical space created by the engine's bottom surface, the design uses the engine as a spatial mediator to achieve both ground clearance and adequate passage area.
2Length of moving object
If the connection pipe diameter is reduced to secure bank angle, then ground contact is avoided, but engine output characteristic deteriorates
Solution Approach 1:
By transitioning from horizontal to vertical pipe arrangement, the solution preserves the pipe diameter and thus maintains exhaust gas flow capacity, which is critical for engine output. The vertical positioning achieves ground clearance without compromising power characteristics.
3Area of stationary object
If the connection pipe is positioned lower to maintain passage area, then exhaust gas emission performance is improved, but ground contact occurs reducing turning performance
Solution Approach 1:
The vertical positioning of the connection pipe beneath the engine creates sufficient clearance from the ground, enabling the pipe to maintain a large diameter for optimal exhaust flow and emission performance, while simultaneously preventing ground contact that would hinder turning operations.
Data Source
AI summary
An exhaust system for a motorcycle in which a bank angle is secured while a necessary passage area of exhaust gas is maintained. A connection pipe connecting left and right exhaust pipes is disposed in an area enclosed by a bottom surface of an engine and left and right bank angle lines in a front view.