Offset Intake Duct Vibration Member Resonance Band
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Solution Overview
Problem
Conventional intake sound generation apparatuses are limited to producing sound effects with a narrow resonance frequency band, failing to effectively cover a wide range of engine rotation speeds from low to high, limiting the sound quality experience.
Innovation Solution
The apparatus features an offset arrangement of the introduction duct and resonance duct relative to the vibration member, allowing for composite vibrations in both axial and radial directions, thereby expanding the resonance frequency band of the intake sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the introduction duct and resonance duct are disposed in axial alignment with the vibration member (concentric arrangement), then the structure is simple and easy to manufacture, but the resonance frequency band is narrow and cannot cover a wide range of engine rotation speeds
Solution Approach 1:
The patent applies asymmetry by offsetting the central axis of the introduction duct or resonance duct from the central axis of the vibration member. This asymmetric arrangement creates composite vibrations in multiple directions (axial and radial), which expands the resonance frequency band to cover a wider range of engine rotation speeds, thereby resolving the contradiction between simple structure and wide frequency coverage.
2Adaptability or versatility
If the introduction duct and resonance duct are disposed in axial alignment with the vibration member, then the structure is compact, but the intake sound has resonance frequency in a relatively narrow band
Solution Approach 1:
By changing the geometric arrangement from concentric (symmetric) to offset (asymmetric), the patent enables composite vibrations that produce a wider resonance frequency band. The offset arrangement maintains compactness while expanding the frequency range of the intake sound effect.
3Adaptability or versatility
If the introduction duct and resonance duct are disposed in axial alignment with the vibration member, then the assembly is easy to manufacture, but it is not possible to produce a sound effect corresponding to a wide range of engine rotation speed
Solution Approach 1:
The offset arrangement of the ducts relative to the vibration member creates composite vibrations that broaden the resonance frequency band, enabling the system to cover a wide range of engine rotation speeds. While the positioning becomes slightly more complex, the overall manufacturing process remains feasible with standard machining 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
This design enables the production of intake sounds with enhanced sound quality across a wider frequency band, providing a more dynamic and powerful sound effect experience, and allows for easier tuning of the resonance frequency.
Implementation Method 1
a vibration member including a diaphragm portion which is vibrated by the intake pulsation
Implementation Method 2
a resonance duct acting to increase and emit a sound pressure of intake sound produced by vibration of the vibration member
Data Source
AI summary
An intake sound generation apparatus for an internal combustion engine, including an introduction duct connected to an intake passage of an intake system of the engine, a vibration member including a diaphragm portion which is vibrated by intake pulsation in the intake system, and a bellows portion configured to promote vibration of the diaphragm portion, the vibration member being so disposed as to cover one end of the introduction duct, and a resonance duct having one end connected to the introduction duct through the vibration member and the other end opened to an outside of the intake sound generation apparatus, the resonance duct acting to increase and emit a sound pressure of intake sound produced by vibration of the vibration member. A central axis of at least one of the introduction duct and the resonance duct is located offset relative to a central axis of the vibration member.