Straddled Vehicle Intake Pipe Resonance Design
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Solution Overview
Problem
Existing straddled vehicles face challenges in reducing intake sound levels due to the complexity of resonator configurations and the need for increased component sizes to avoid interference, which complicates the peripheral intake path configuration.
Innovation Solution
A straddled vehicle design featuring an intake pipe with an upstream portion within the air cleaner's clean section, a downstream portion outside the air cleaner, and an attached portion between the two, including a funnel portion and a pipe portion with through holes to adjust the natural frequency of the intake path and reduce intake sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a resonator is added to reduce intake sound, then intake sound is reduced, but device complexity increases
Solution Approach 1:
The patent combines the resonator function with the existing air cleaner body by forming a communication hole through the case wall, allowing the air cleaner to serve dual purposes as both a filtration device and a resonator, thereby reducing intake sound without adding separate components
Solution Approach 2:
The air cleaner case itself is utilized as the resonator structure, where the case wall with communication hole creates the resonant chamber that naturally reduces intake sound, eliminating the need for external resonator components
2Object-affected harmful factors
If a resonator with predetermined capacity is added, then intake sound is reduced, but the size of peripheral components increases
Solution Approach 1:
The resonator is merged with the air cleaner case structure, using the existing case volume to create the resonant chamber, thereby avoiding additional space requirements for separate resonator components
Solution Approach 2:
The resonator function is nested within the air cleaner case structure, where the communication hole through the case wall creates a resonant space that utilizes the existing case volume rather than requiring external space
3Object-affected harmful factors
If the resonator configuration is optimized for sound reduction, then intake sound is reduced, but ease of manufacture decreases
Solution Approach 1:
The case wall is segmented to include a communication hole that separates the inner and outer spaces, creating a simple structural modification that can be easily manufactured while achieving resonator functionality
Solution Approach 2:
The communication hole parameters (position, size, shape) are optimized to achieve desired resonant frequency for intake sound reduction, while maintaining a simple hole structure that is easy to manufacture through standard drilling or punching operations
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 simplifies and compacts the peripheral intake path configuration while effectively reducing intake sound levels by adjusting the natural frequency of the intake path, eliminating the need for additional resonator components.
Implementation Method 1
one or a plurality of through holes are formed in a portion, that is closer to the attached portion than the funnel portion, in the pipe portion
Data Source
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AI summary
There is disclosed a motorcycle (100) with an engine (30), an air cleaner (10) and an intake pipe (50); the intake pipe (50) being configured to be one portion of an intake path guiding air that has been cleaned by the air cleaner (10) to the engine (30); intake pipe (50) further having an upstream portion (51) disposed in a clean section of an inner space of air cleaner (10), a downstream portion (52) disposed outside of air cleaner (10), and an attached portion (53) that is located between the upstream portion (51) and the downstream portion (52) of intake pipe (50) and attached to an outer wall of air cleaner (10); the upstream portion (52) of the intake pipe (50) including a funnel portion (511) that opens to the inner space of air cleaner (10) and a pipe portion (512) that connects a funnel portion (511) and the attached portion (53) to each other; one or a plurality of through holes (59) being formed in a portion (512), that is closer to the attached portion (53) than the funnel portion (511), in the pipe portion (512).