Motorcycle Engine Rearward Cylinder Inclination for Mass Concentration
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Solution Overview
Problem
Conventional motorcycle designs face challenges in achieving a lower center of gravity and mass concentration due to the high placement of the camshaft and cylinder, which hinders the optimal distribution of weight.
Innovation Solution
The engine is positioned between the front and rear wheels with a rearwardly inclined cylinder, an upward and forward intake system, and an exhaust system connected to the rear side of the cylinder, allowing the cylinder axial line to pass rearward of the seat, accompanied by a single overhead camshaft configuration and crankcase change gear arrangement for mass concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the cylinder axial line is disposed forward of the seat to maintain engine functionality, then the engine can operate properly, but the camshaft height increases making it difficult to achieve lower center of gravity
Solution Approach 1:
The patent applies dimensional repositioning by moving the intake system from a traditional lateral or forward position to an upward position above the cylinder. This vertical displacement allows the cylinder axial line to pass rearward of the seat while maintaining adequate intake system functionality, thereby lowering the camshaft height and achieving a lower center of gravity without compromising engine operation
Solution Approach 2:
Instead of positioning the intake system forward or laterally as in conventional designs, the patent inverts the spatial arrangement by placing the intake system upward above the cylinder. This inverted configuration enables the cylinder to be positioned more rearwardly, which lowers the camshaft and achieves better weight distribution with a lower center of gravity
2Stability of the object's composition
If the cylinder is positioned to achieve mass concentration, then the center of gravity can be lowered, but the intake system layout becomes more challenging
Solution Approach 1:
The patent resolves the intake system layout challenge by transitioning from a horizontal or forward-intake arrangement to a vertical-intake configuration. By positioning the intake system upward above the cylinder, the design achieves mass concentration with the cylinder axial line passing rearward of the seat, while the intake system remains accessible and functional in the vertical space above the engine
Data Source
AI summary
A motorcycle is provided that includes intake system parts connected to a front side of a cylinder of an engine, and exhaust system parts connected to the rear side of the cylinder. The cylinder is inclined rearward, and the intake system parts are disposed forward and upward of the cylinder. A cylinder axial line C of the cylinder passes rearward of the motorcycle with respect to a lowermost portion of a seating face of a seat, as viewed in a side elevation of the motorcycle.