Internal-combustion engines – Intake manifold – Manifold material or composition
Patent
1998-04-20
2000-07-25
Kamen, Noah P.
Internal-combustion engines
Intake manifold
Manifold material or composition
12318453, 12318457, F02M 3510
Patent
active
060924993
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an air intake manifold for an internal combustion engine, wherein the intake manifold comprises at least one flange at the engine end, at least two tube elements, as well as a manifold chamber communicating with the tube elements.
Such intake manifolds are known, for example, in use in passenger automobiles.
If it is desired to use such intake manifolds in motor vehicles which must satisfy strict noise emission requirements, it is a disadvantage that the tubes produce undesirable noise in various states of operation.
It might be possible to fully enclose an engine compartment or cover areas which produce intense noise with insulating material. This, however, is expensive to manufacture and would therefore increase the cost of the entire vehicle. Furthermore, it would increase weight, which automatically would result in an increase in fuel consumption.
SUMMARY OF THE INVENTION
It is thus the object of the invention to improve an air intake manifold of the kind described above so as to make it lightweight, inexpensive and quiet.
In accordance with the invention this object is achieved by dividing the manifold chamber of the intake manifold with a dividing element into at least two communicating compartments.
Due to the presence of the dividing element the formation of vibratory modes is impeded or suppressed.
An advantageous embodiment of the invention provides for the intake manifold to be composed of synthetic resin material. The use of synthetic resin material makes the intake manifold lighter in weight, thereby lowering fuel consumption.
Furthermore, provision can advantageously be made for the intake manifold to be manufactured by the half-shell technique. This manufacturing technique offers cost advantages with simple shapes.
In another advantageous embodiment of the invention the dividing element covers substantially 100% of the manifold chamber cross section. Since the dividing element divides the chamber substantially into two parts, the development of modes of vibration is wholly or partially suppressed.
In an advantageous embodiment of the invention, the dividing element covers 25 to 75% of the manifold chamber cross section. Even a partial cross-sectional reduction suffices to break up the propagation of vibration modes, so that this variant results in an additional weight reduction, while the air, as a vibrating mass, interacts through the cross-sectional reduction against a volume of air behind it that acts as a damper. Furthermore, it is important to see to it that the linear dimensions are small in proportion to the wavelength, which prevents scattering in the vicinity of the cross-sectional reduction. It is also advantageous to make the marginal clamping of the dividing elements resiliently mounted. Advantageously, the dividing element is composed wholly or partially of porous material.
Advantageously, the distance from the dividing element to the manifold chamber's inner wall is not evenly divisible by the wavelengths which occur in the primary operating state or a multiple thereof. This prevents the occurrence of standing waves.
In an advantageous embodiment of the invention, the distance from the dividing element to the inner wall of the manifold chamber is adjustable. By appropriate selection of the geometry, or appropriate adaptation of the geometry to the prevailing operating conditions, for example by means of displaceable intermediate walls moved by means of electrical systems or by vacuum-supported elements, the occurrence of standing waves is prevented, since they form whenever a wave after, for example, two reflections comes back to the starting point with the same phasing.
These and other features of preferred embodiments of the invention are found not only in the claims but also in the description and the drawings, the individual features can be utilized individually or severally in the form of sub-combinations in the embodiments of the invention and in other fields, and may constitute advantageous as well as independently
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Filterwerk Mann & Hummel GmbH
Huynh Hai
Kamen Noah P.
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