Motorcycle Intake System Injector Placement
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Solution Overview
Problem
Underbone type motorcycles face challenges in enhancing engine output and fuel efficiency due to the complex geometry of the intake pipe and injector placement, which restricts airflow and fuel direction, making it difficult to straddle the motorcycle while maintaining easy mounting and dismounting.
Innovation Solution
The design includes a concave region behind the head pipe and above the main frame, with a throttle body and injector placement that allows the injector to be positioned more forward than the throttle body, reducing the need for significant bending of the intake pipe, improving airflow and fuel direction towards the combustion chamber, and utilizing a shorter first intake pipe to enhance intake efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the intake pipe is significantly bent to connect the injector to the combustion chamber, then the injector can be positioned to direct fuel toward the combustion chamber, but air flow through the intake pipe becomes difficult and intake efficiency decreases
Solution Approach 1:
The patent repositions the injector from a rearward location to a forward location on the throttle body, changing the spatial dimension of component arrangement. This dimensional shift allows the intake pipe to connect components in a more linear fashion, reducing bends and improving airflow while maintaining fuel injection effectiveness toward the combustion chamber
2Ease of operation
If the main frame is located at a low position to allow easy mounting and dismounting, then rider accessibility is improved, but the degree of freedom for installation positions of the injector and throttle body is reduced
Solution Approach 1:
The patent applies local quality by specifically positioning the injector at the forward end of the throttle body, creating a localized optimization point. This focused arrangement allows the intake system to achieve better airflow characteristics without requiring changes to the overall low main frame configuration, thus maintaining ease of mounting and dismounting while improving engine performance
3Volume of moving object
If the injector is positioned rearward on the throttle body, then installation space is reduced, but the injection direction cannot be effectively directed toward the combustion chamber
Solution Approach 1:
The patent inverts the conventional rearward injector positioning by placing the injector at the forward end of the throttle body. This inversion allows the intake pipe to connect more directly from the air cleaner through the throttle body to the combustion chamber, reducing pipe bends and improving airflow. The forward positioning also enables better fuel injection direction toward the combustion chamber while maintaining compact installation space
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 improves fuel efficiency and engine output while allowing riders to easily mount and dismount the motorcycle by maintaining a low concave region and optimizing the placement of components for better airflow and fuel injection.
Implementation Method 1
an injector for injecting fuel toward the intake port
Implementation Method 2
a throttle body connected to the first intake pipe and incorporating a throttle valve
Data Source
Figure 1
Figure 2
Figure 3
AI summary
When a motorcycle 1 is viewed laterally, a concave region 12 is formed rearward of a head pipe 3, forward of a seat 9 and above a main frame 4. A throttle body 44 is provided at its lower end portion with a lower connection opening 44a connected to a first intake pipe 42, and is provided at its upper end portion with an upper connection opening 44b connected to a second intake pipe 46. When viewed from above the motorcycle 1, the upper connection opening 44b, the lower connection opening 44a and an intake port 25 at least partially overlap with each other. An injector 50 is attached to a front portion of the throttle body 44.