Motorcycle Intake Funnel Orientation for Reduced Airflow Resistance
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Solution Overview
Problem
The existing design of vehicles with engines, such as motorcycles, experiences decreased intake efficiency due to increased air flow resistance caused by sharply curved funnel parts and requires longer vehicle lengths to avoid contact between the funnel and down tube, leading to inefficiencies in engine performance and increased vehicle length.
Innovation Solution
The engine is positioned with a cylinder axis inclined rearward, and an intake pipe with a connecting part that forms an acute angle with the cylinder axis, along with a funnel part extending more vertically, reducing air flow resistance and maintaining a shorter vehicle length by avoiding sharp curves and unnecessary distance between the down tube and engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the funnel part sharply curves upward from one end toward the other end, then the connecting part can be attached perpendicular to the cylinder axis, but the flow resistance of air increases and intake efficiency decreases
Solution Approach 1:
Instead of curving the funnel part sharply upward as in conventional designs, the patent inverts the approach by making the funnel part extend substantially parallel to the cylinder axis, thereby reducing flow resistance and improving intake efficiency while achieving the desired compact configuration
Solution Approach 2:
The patent changes the geometric parameters of the funnel part by adjusting its extension direction to be substantially parallel to the cylinder axis rather than curving sharply upward, which optimizes air flow characteristics and reduces flow resistance
2Device complexity
If the connecting part is attached perpendicular to the cylinder axis, then the structure is simplified, but a longer distance is needed between the down tube and the engine, increasing vehicle length
Solution Approach 1:
The patent utilizes the vertical dimension by extending the funnel part substantially parallel to the cylinder axis, which allows the intake system to achieve its function within a shorter horizontal distance, thereby reducing vehicle length while maintaining structural simplicity
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 enhances engine intake efficiency while preventing an increase in vehicle length, improving engine performance, particularly during low and medium-speed driving, by minimizing air resistance and optimizing the intake pipe's length.
Implementation Method 1
flow resistance of air that is drawn into the engine disadvantageously increases when the air passes through the funnel part to flow into the connecting part
Data Source
AI summary
A motorcycle has a head pipe and an engine disposed with its cylinder axis inclined rearward. An intake pipe located between a down tube and the engine is connected to a front part of the engine and includes an engine connecting part connected to a front part of the engine. The engine connecting part is inclined upward to the front to define an acute angle with respect to the cylinder axis of the engine. A funnel is connected to a throttle body and extends upward to the front in a more vertically upward direction than an axis of the throttle body.