Motorcycle Intake Resonator Segmentation for Noise Attenuation
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Solution Overview
Problem
Conventional motorcycle intake systems with resonators placed apart from the engine struggle to adequately attenuate intake noise due to limited resonator capacity and interference with surrounding vehicle components.
Innovation Solution
The intake system features resonators individually placed on the air cleaner's expansion chamber and intake ducts, with varying duct capacities and an opening/closing valve, allowing for efficient noise attenuation and easy arrangement without interfering with the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If resonators are provided on both side portions of the air cleaner case, then intake noise can be attenuated, but the resonator capacity is limited due to width dimension constraints
Solution Approach 1:
The patent divides the resonator system into multiple separate resonators distributed at different locations (both side portions and front/rear portions of the air cleaner case) rather than using a single large resonator. This segmentation allows the total resonator capacity to be increased while fitting within the width constraints of the air cleaner case.
Solution Approach 2:
The patent utilizes multiple spatial dimensions (width, length, depth) of the air cleaner case to arrange resonators. By placing resonators not only on the side portions but also on the front and rear portions, the system effectively uses the three-dimensional space available, increasing total resonator capacity without exceeding width limitations.
2Object-affected harmful factors
If resonators are provided on both side portions of the air cleaner, then noise attenuation is achieved, but it is difficult to arrange resonators with sufficient capacities due to interference with surrounding components
Solution Approach 1:
By segmenting the resonator system into multiple smaller resonators placed at different locations (side portions, front portion, rear portion), the design gains flexibility to arrange them in available spaces without interfering with surrounding components like the vehicle body frame.
Solution Approach 2:
The patent utilizes multiple spatial dimensions and locations within the air cleaner case (side portions, front portion, rear portion) to arrange resonators, providing adaptability to fit around other components while maintaining sufficient total capacity for effective noise attenuation.
3Ease of manufacture
If resonators are located apart from the engine, then installation is simplified, but intake noise cannot be attenuated sufficiently
Solution Approach 1:
The patent segments the resonator system into multiple smaller resonators that can be individually installed on the air cleaner case. This segmentation allows the resonators to be positioned relatively close to the engine through the air cleaner structure, improving noise attenuation effectiveness while maintaining installation simplicity.
Solution Approach 2:
The air cleaner case serves as an intermediary structure that allows resonators to be positioned between the engine and the external environment. By mounting resonators on the air cleaner case at strategic locations, the system achieves effective noise attenuation close to the engine while utilizing the air cleaner as the mounting platform.
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 effectively reduces intake noise by positioning resonators close to the engine source and in the intake ducts, while allowing for larger duct areas and flexible arrangement to avoid interference with other components.
Implementation Method 1
resonators are provided on the air cleaner... intake noise of the engine, which is emitted from the air cleaner to the outside, is attenuated by the resonators
Implementation Method 2
intake noise can be attenuated at positions close to the engine as a main source of the intake noise, and in addition, the intake noise in the intake duct as an outlet of the intake noise, can be attenuated
Data Source
AI summary
To provide an intake system of a motorcycle, which is capable of attenuating intake noise efficiently, and facilitating arrangement of resonators. An air cleaner includes an air cleaner case having an element and an expansion chamber with an intake passage connected thereto. Intake ducts introduce outside air into the air cleaner case. Resonators are provided on the expansion chamber and intake ducts, respectively.