Resonator Integrated in Air Cleaner for Intake Noise Reduction
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Solution Overview
Problem
Existing intake noise reduction systems for motorcycles face challenges in effectively reducing noise without limiting the layout and design of the intake system, often requiring additional components to prevent resonator deformation and damage, which can increase system complexity.
Innovation Solution
An intake noise reduction device is designed with a resonator positioned within the air cleaner, where the pipe portion's opening is inserted into the intake funnel, ensuring the resonator's opening is close to the intake valve, and the cross-sectional area between the intake funnel and resonator is set to match or exceed the throttle body's opening area, allowing for efficient noise reduction without compromising intake performance or increasing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the resonator is attached to the outside of the intake funnel to bring the opening closer to the intake valve, then noise reduction is improved, but the layout and design of the surroundings of the intake funnel are limited
Solution Approach 1:
The resonator is nested inside the air cleaner housing, with its pipe portion extending through the housing and opening end inserted into the intake funnel. This nesting arrangement allows the resonator to be positioned close to the intake valve for effective noise reduction while the air cleaner housing provides the necessary spatial buffer to maintain layout flexibility.
2Object-affected harmful factors
If the resonator opening is positioned closer to the intake valve, then noise reduction is improved, but additional components may be needed to prevent resonator deformation and damage
Solution Approach 1:
The air cleaner housing serves as a protective cushioning structure that encloses the resonator before damage can occur. The housing provides mechanical protection and spatial constraints that prevent resonator deformation, eliminating the need for additional protective components while maintaining close positioning of the resonator opening to the intake valve.
3Object-affected harmful factors
If the pipe portion of the resonator is inserted into the intake funnel, then noise reduction is improved, but the intake amount may be limited by the resonator
Solution Approach 1:
The cross-sectional area of the passage between the intake funnel and resonator is specifically designed to be not less than the opening area of the intake passage when the throttle body is fully opened. This local quality optimization ensures that the resonator insertion does not create a flow restriction, maintaining sufficient intake amount while achieving noise reduction.
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 intake noise reduction without limiting the layout or design of the intake system, utilizes available space within the air cleaner, and prevents the need for additional components to prevent resonator deformation, maintaining engine intake performance.
Implementation Method 1
aerial vibration of intake noise of an engine transmitted to inside of the air introduction duct resonates with aerial vibration generated in the resonator, and is attenuated
Data Source
AI summary
An intake noise reduction device includes an air cleaner, an intake funnel and a resonator, and is connected to an engine via a throttle body. The resonator is provided inside of the air cleaner. The resonator includes a chamber portion and a pipe portion. The pipe portion is formed to extend downward from the chamber portion, and has an opening end at a lower end. The intake funnel is provided at a lower end of the air cleaner. An opening end of the resonator is inserted into the intake funnel. A cross sectional area of an intake passage between the intake funnel and the pipe portion is set to not less than an opening area of an intake passage of the throttle body opened to a maximum throttle opening.