Intake Manifold Resonator for Multicylinder Engine
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Solution Overview
Problem
Multicylinder internal combustion engines with reversed bends in intake runners face challenges in reducing longitudinal dimension while accommodating a resonator, as the resonator's size is restricted by engine components, making it difficult to form a necessary volume for the resonance chamber.
Innovation Solution
The intake runners are designed with bends that curve towards the cylinder axes, allowing the resonator to be positioned closer to the engine body, eliminating the need for longitudinal protrusion and enabling a larger resonance chamber volume without interference from engine components, while the resonator is integrated with the intake manifold to increase rigidity and facilitate a connecting passage for adjusting resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the resonator is disposed on the inner side of the bends, then the longitudinal dimension of the engine is reduced, but the size of the resonator is restricted and it is difficult to form the resonator in a necessary volume
Solution Approach 1:
The resonator is repositioned from the inner side of the bends to the outer side of the bends, utilizing the lateral dimension (width direction) instead of the longitudinal dimension. This dimensional shift allows the resonator to achieve necessary volume without increasing the engine's longitudinal dimension, as the outer side of the bends provides sufficient lateral space.
2Volume of stationary object
If the resonator is disposed on the outer side of the bends, then the volume of the resonance chamber can be increased, but the longitudinal dimension of the engine increases
Solution Approach 1:
The design utilizes the lateral dimension (width direction) at the outer side of the bends to accommodate the resonator volume requirements. By orienting the resonator in the lateral direction rather than extending it longitudinally, the engine achieves the necessary resonance chamber volume without increasing its longitudinal dimension.
3Volume of stationary object
If the bends are shifted away from the engine body to accommodate the resonator, then the resonator can be formed in necessary volume, but the longitudinal dimension of the internal combustion engine cannot be fully reduced
Solution Approach 1:
Instead of shifting the bends away from the engine body in the longitudinal direction, the design positions the resonator at the outer side of the bends utilizing the lateral dimension. This approach achieves the necessary resonance chamber volume while maintaining the bends close to the engine body, thereby keeping the longitudinal dimension minimized.
4Length of moving object
If the resonator is formed in a compact size to avoid interference with engine components, then the longitudinal dimension is reduced, but it is difficult to form the resonator in a necessary volume
Solution Approach 1:
The resonator is designed to extend in the lateral direction at the outer side of the bends rather than in the longitudinal direction. This dimensional reorientation allows the resonator to achieve the necessary volume without increasing the engine's longitudinal dimension, effectively decoupling the volume requirement from the longitudinal dimension constraint.
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 reduces the engine's longitudinal dimension, allows for a larger resonance chamber volume, and enhances the rigidity of the intake runners, while enabling compact formation of the connecting passage and proper resonance frequency adjustment.
Implementation Method 1
a resonator defining a resonance chamber communicating with the intake chamber
Data Source
AI summary
A multicylinder internal combustion engine E has a cylinder head 2; a cylinder head cover 3; an intake manifold 20 having a header body 21 disposed right above an engine body and intake runners 22; and a resonator 50. Each of the intake runners 22 has a bend 24 extending away from cylinder axes L in a longitudinal direction A2 perpendicular to the cylinder axes L, and curving so as to extend reversely toward the cylinder axes L. The resonator 50 is disposed opposite to the engine body with respect to the intake manifold 20 and is nearer to the cylinder axes L than outermost end parts 24a of the bends 24. The engine including the in take manifold and the resonator can be formed in a small dimension with respect to a longitudinal direction perpendicular to the cylinder axes, and the resonance chamber of the resonator can be easily formed to have a necessary volume.