Intake Manifold Noise Prevention Net Design
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Solution Overview
Problem
Existing intake manifolds generate high-frequency noise due to air eddies downstream of the throttle valve, particularly when the surge tank is constructed from resin, and there is a need for an improved solution to reduce noise while maintaining airflow efficiency.
Innovation Solution
Incorporating a noise prevention net within the air intake pathway of the intake manifold, which covers less than half of the cross-sectional area and features radial openings along the inner wall of the conducting pipe to reduce noise volume and airflow resistance, allowing increased airflow into the surge tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a net is placed within the air intake pathway to reduce noise, then noise volume decreases, but airflow resistance increases
Solution Approach 1:
The patent applies a net with mesh structure (porous material) in the air intake pathway. The net reduces noise by filtering and dampening air flow turbulence while its porous structure allows air to pass through with relatively low resistance, balancing noise reduction with maintained airflow efficiency
Solution Approach 2:
The net is strategically positioned at specific locations within the air intake pathway (downstream of the throttle valve and upstream of the surge tank) where it can most effectively reduce noise from air eddies. The net covers only a portion of the cross-section rather than the entire pathway, reducing noise locally while maintaining overall airflow efficiency
2Weight of moving object
If the surge tank is constructed from resin to reduce weight, then weight decreases, but noise volume increases
Solution Approach 1:
The net acts as an intermediary element between the air flow and the resin surge tank. It reduces the noise generated by air eddies before the air enters the surge tank, thereby preventing the resonance that would otherwise occur in the lightweight resin tank, thus maintaining both weight reduction and noise control
3Object-affected harmful factors
If a net is placed in the air intake pathway to reduce noise, then noise volume decreases, but device complexity increases
Solution Approach 1:
The net serves multiple functions simultaneously: it reduces noise from air eddies, maintains airflow efficiency through its porous structure, and can be integrated into existing intake manifold designs without requiring complete system redesign. This multi-functionality reduces the need for additional separate noise control devices
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 noise prevention net effectively decreases noise volume and maintains airflow efficiency by allowing air to pass through while minimizing interference with the throttle valve operation, thus enhancing the performance of the intake manifold.
Implementation Method 1
the air flowing into the surge tank eddies downstream of the throttle valve apparatus, and thus generates high-frequency noise
Implementation Method 2
the opening reduces airflow resistance when the air flows through the noise prevention net
Data Source
AI summary
An intake manifold capable of being connected with a throttle valve apparatus includes a conducting pipe defining an air intake pathway therein, a surge tank for receiving air flowing from the throttle valve apparatus through the air intake pathway, and a noise prevention net placed within a half of a cross section of the air intake pathway. The noise prevention net has a net portion for reducing noise volume and defines at least one opening outside of the net portion in a radial direction in the cross section of the air intake pathway such that the opening is positioned along or near an inner wall of the conducting pipe.