Motorcycle Intake and Exhaust Layout for Mass Concentration
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Solution Overview
Problem
Existing motorcycle designs face challenges in concentrating mass and lowering the center of gravity due to the arrangement of intake and exhaust parts, particularly in V-type engines, where exhaust pipes are longitudinally distributed and mufflers are often positioned high, making it difficult to achieve a compact vehicle body and optimal engine output.
Innovation Solution
The motorcycle design positions the engine between the front and rear wheels, with the intake part located in front of the cylinder and the exhaust part at the rear, and the muffler arranged below the crankcase, forming a V-type configuration that allows for efficient air intake and exhaust gas emission, thereby concentrating mass and lowering the center of gravity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the intake part is arranged on the upside of the cylinder, then the air intake function is achieved, but the mass concentration and center of gravity lowering become difficult
Solution Approach 1:
The intake part is relocated from the vertical dimension (upside of cylinder) to the horizontal dimension (front of cylinder, back of radiator), changing the spatial arrangement to achieve both air intake function and mass concentration at the front of the vehicle body
2Ease of operation
If the muffler is located in a high position, then the exhaust function is achieved, but the center of gravity lowering becomes difficult
Solution Approach 1:
The muffler is relocated from the vertical dimension (high position) to the horizontal dimension (below crankcase, between transmission and rear wheel), achieving exhaust function while lowering the center of gravity to improve vehicle stability
3Ease of operation
If the exhaust pipes are longitudinally distributed in a V-type engine, then the exhaust function is achieved, but the mass concentration becomes difficult
Solution Approach 1:
The exhaust pipes from both cylinders are merged into a single muffler located below the crankcase, consolidating the exhaust function and concentrating mass at the rear of the vehicle body, improving both mass distribution and vehicle stability
4Ease of operation
If the intake part is arranged on the upside of the cylinder, then the air intake function is achieved, but the vehicle body compactness and heat shielding become difficult without special members
Solution Approach 1:
The intake part is repositioned to the front of the cylinder and back of the radiator, utilizing the existing spatial relationship between these components to achieve compact arrangement and inherent heat shielding without requiring additional special members
Data Source
AI summary
To concentrate mass, to lower the center of gravity, to efficiently and optimally arrange an intake part for making a compact vehicle body. A cylinder inclined to the rear is arranged under a fuel tank and a body of an intake box is housed between a radiator arranged in front of the cylinder and the cylinder. An upper part of the body of the intake box is fixed to a body frame at the bottom of the fuel tank and air taken in is supplied to an intake port through an intake funnel and a throttle body respectively built-in. A lid of an intake duct can be extractably inserted into a window hole provided to the front of the body, a duct part integrated with the lid is arranged over the radiator, and an air intake guide port takes a flow of air in front of the radiator.