Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters
Reexamination Certificate
2001-12-13
2003-07-29
Wolfe, Willis R. (Department: 3747)
Internal-combustion engines
Accessories
Covers, trays, vibrators, corrosion inhibitors, air filters
C123S184610, C029S890080
Reexamination Certificate
active
06598581
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention generally relates to an intake manifold of an internal combustion engine of a motor vehicle. More specifically, this invention relates to reducing noise in an intake manifold of an internal combustion engine.
BACKGROUND OF THE INVENTION
Noise is generated by the internal combustion engines due to engine vibration, internal pressure pulsations, and combustion. Intake manifolds have a distinct and profound affect on the Noise Vibration and Harshness (NVH) quality of the vehicle. This is because the intake manifolds are excited not only by the vibrational input of the structure of the engine but they are also excited by internal pressure pulsations due to intake events. Therefore, there is a need to design a manifold that is structurally sound to resist an extremely wide frequency range of forcing inputs.
In order to suppress undesirable noise from the intake manifold, prior art techniques have taught the use of an intake manifold cover. The cover is mechanically attached, sometimes with isolating features, to the intake manifold or engine. However, it has been found that the use of the NVH cover does not always result in effective reduction of noise from the manifold. Also, it has been found that due to packaging requirements the cover may not completely cover the intake manifold thereby allowing noise to escape.
Additionally, it has been found that aluminum intake manifolds have superior NVH qualities to that of plastic intake manifolds. This is due to their greater mass, which increases transmission loss through the part, and due to the increased stiffness of the part, which allows the manifold to resist deflection. Therefore, it is found that composite intake manifolds do not prevent noise transmission from their surfaces to maintain levels of radiated noise as low as possible.
Therefore, there is a need in the industry to manufacture intake manifolds that maintain low levels of NVH, are lightweight, easy to manufacture and cost effective.
SUMMARY OF THE INVENTION
The present invention generally relates to a component for an internal combustion engine of an automobile having reduced NVH properties. The component has a shell formed of a plastic composite material. The shell defines an inlet port, an outlet port, an outer surface and an inner surface. The inner surface defines an inner cavity to allow air passage to the internal combustion engine. In addition the component includes a damping layer disposed on the outer surface, where the damping layer substantially dampens the noise emitted from the component.
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Brinks Hofer Gilson & Lione
Huynh Hai
Visteon Global Technologies Inc.
Wolfe Willis R.
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