Motorcycle Intake Air Guide C-Shaped Steering Head Bypass
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Solution Overview
Problem
Existing motorcycle intake air guides do not effectively maximize the intake air flow to the internal combustion engine while allowing sufficient space for steering head movement, leading to suboptimal performance and potential weight increase due to dedicated duct integration into the motorcycle frame.
Innovation Solution
A motorcycle intake air guide with a C-shaped steering head flow-around region that splits the intake air flow into two branches, providing a larger cross-sectional area and using a flexible sealing lip for fluid-tight connection with the frame, allowing for a symmetrical and efficient air flow without an inner duct wall, thus reducing frame weight and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intake air guide is integrated into the motorcycle frame as a dedicated duct, then the air flow path is defined, but the frame weight increases
Solution Approach 1:
The patent merges the intake air guide function with the motorcycle frame structure itself. The frame is designed with a C-shaped cross-section that naturally forms the air guide duct, eliminating the need for a separate dedicated duct integration. This combining approach maintains reliable air flow path definition while avoiding the weight penalty of an additional integrated duct structure.
2Reliability
If the intake air guide uses a closed cross-sectional profile, then the air flow is contained, but the steering head movement space is reduced
Solution Approach 1:
The patent segments the air guide structure into an open C-shaped profile rather than a fully closed section. This segmentation allows the air flow to be contained within the C-shaped duct while leaving the center opening free for steering head movement. The air guide duct is positioned such that it contains air flow reliably without enclosing the steering head space, thus resolving the contradiction between air flow containment and steering head movement space.
3Weight of stationary object
If the intake air guide is designed without an inner duct wall, then the frame weight is reduced, but the fluid-tight sealing becomes more difficult
Solution Approach 1:
The patent employs a flexible sealing lip made of elastomeric material at the open end of the C-shaped air guide duct. This flexible lip provides fluid-tight sealing between the air guide and the frame without requiring a heavy inner duct wall. The elastomeric material deforms to create an effective seal, maintaining reliability while keeping the frame weight reduced through the absence of a rigid inner duct structure.
4Productivity
If the intake air guide uses a larger cross-sectional area, then the intake air flow increases, but the device complexity increases
Solution Approach 1:
The patent designs the motorcycle frame with a C-shaped cross-section that serves multiple functions: it provides the overall frame structure, defines the air guide duct path, and creates the necessary structural strength. This multi-functional design allows the air guide to have a larger effective cross-sectional area for increased intake air flow without adding device complexity, as the same structural elements serve both structural and air guiding purposes.
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
The design achieves a greater intake air flow and reduced frame weight by utilizing the motorcycle frame itself as part of the duct, ensuring a reliable and efficient air supply to the engine while maintaining fluid-tight sealing and easy mounting.
Implementation Method 1
a flexible sealing lip for fluid-tight connection with the frame
Implementation Method 2
splits the intake air flow into two branches, providing a larger cross-sectional area and using a flexible sealing lip for fluid-tight connection with the frame
Data Source
AI summary
A motorcycle intake air guide for guiding an intake air volumetric flow from a front region of a motorcycle to a motorcycle internal combustion engine includes a front air guiding duct, a rear air guiding duct arranged downstream of the front air guiding duct, and a steering head bypass region arranged between and connecting the front and the rear air guiding ducts to one another. The front and the rear air guiding ducts have a closed profile. The steering head bypass region preferably has, in a steering head cross-sectional plane which is arranged orthogonally with respect to a main flow direction of the intake air volumetric flow in the steering head bypass region, a non-closed profile for guiding the intake air volumetric flow around a steering head recess through which a steering head of the motorcycle extends. The steering head may close the non-closed profile at the steering head recess.