Motorcycle Intake Duct with Elastic Deformable Fork Zone
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Solution Overview
Problem
Conventional intake duct structures for motorcycles have a limited cross-sectional area, which restricts the orbital movement of front forks and hampers the efficiency of introducing traveling wind to the engine.
Innovation Solution
An intake duct structure with an elastically deformable area where the rotational orbit of the front forks overlaps, allowing the intake duct to be larger in diameter without interfering with fork movement, using materials like silicon for the interfered area to absorb handlebar turning angles and maintain steering stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the intake duct cross-sectional area is increased to improve wind intake efficiency, then the efficiency of introducing traveling wind to the engine is improved, but the orbital movement of the front forks is restricted
Solution Approach 1:
The intake duct is divided into a rigid portion and a flexible portion. The rigid portion maintains structural integrity and airflow path, while the flexible portion (made of elastic material like rubber or silicone) is positioned in the interfered area to allow deformation during fork movement, thus resolving the contradiction between maintaining large cross-sectional area for efficiency and allowing orbital movement for handling.
Solution Approach 2:
Different portions of the intake duct have different properties: the non-interfered area uses rigid material for structural stability and optimal airflow, while the interfered area uses flexible material to accommodate front fork movement. This local differentiation allows the duct to simultaneously achieve large cross-sectional area for efficiency and flexibility for handling.
2Productivity
If the intake duct is positioned closer to the front forks to maximize cross-sectional area, then the efficiency of introducing traveling wind is improved, but the handling stability is impaired
Solution Approach 1:
The intake duct transitions from a static rigid structure to a dynamic structure with flexible portions that can deform in response to front fork movement. The flexible portion dynamically adjusts its shape during steering operations to avoid interfering with fork orbital movement, thereby maintaining both large cross-sectional area for efficiency and handling stability.
Solution Approach 2:
The flexible portion of the intake duct is constructed using elastic materials such as rubber or silicone, which can stretch and deform to accommodate the orbital movement of the front forks during steering. This flexibility allows the duct to be positioned closer to the front forks to maximize cross-sectional area without compromising handling stability.
3Ease of operation
If the intake duct cross-sectional area is limited to ensure front fork movement, then handling is improved, but the efficiency of introducing traveling wind to the engine is reduced
Solution Approach 1:
The intake duct is segmented into rigid and flexible portions, allowing the overall cross-sectional area to be maximized while the flexible portion accommodates fork movement. This segmentation enables both large size for efficiency and movement capability for handling.
Solution Approach 2:
The intake duct uses composite construction with rigid materials (for structural integrity and airflow) and flexible materials like rubber or silicone (for accommodating movement). This composite approach allows the duct to achieve both large cross-sectional area for efficiency and flexibility for handling.
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
Enhances wind intake efficiency by increasing the duct's diameter without impairing fork displacement, ensuring stable steering and optimal air supply during both straight and turning conditions.
Implementation Method 1
an interfered area where a rotational orbit of the front forks at a time of steering overlaps the intake duct structure is elastically deformable
Data Source
AI summary
An intake duct structure of a motorcycle includes front forks disposed on both of right and left sides of a head pipe of a body frame and a main frame extending obliquely backward and downward from the head pipe, wherein the intake duct structure extends from a front end of the motorcycle toward the head pipe and is formed in such a manner that an interfered area where a rotational orbit of the front forks at a time of steering overlaps the intake duct structure is elastically deformable.