Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1997-09-15
1999-09-07
Kamen, Noah P.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
12318453, F02M 35108
Patent
active
059470720
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an air intake device for an internal combustion engine having an at least partially variable orifice for adapting the air intake to the operating conditions of the internal combustion engine.
STATE OF THE ART
An air intake device for an internal combustion engine is already disclosed in DE-OS 40 41 786, in which a controllable shut-off means is present for varying the aperture through which the aspirated air flows. The shut-off means is situated in a cross passage between two air aspirating passages and is opened or closed by commands from an electronic controller. The commands are dependent upon the rotary speed of the internal combustion engine and upon the temperature of the outside air, which is determined by a temperature sensor.
The invention is addressed to the problem of developing an air intake device for an internal combustion engine having an at least partially variable orifice for adapting the air intake to the operating conditions of the internal combustion engine, such that, with simple means, and without additional control devices, an adaptation of the orifice of the air intake device to the conditions of operation of the internal combustion engine will be possible.
ADVANTAGES OF THE INVENTION
The air intake device according to the invention solves the stated problem by the air intake device having at least one inner tube and one outer tube, whereby the aspirated air stream passes in every state of operation through the inner tube, and an additional air stream passes through a supplemental orifice of variable size in the area between the inner tube and the outer tube.
The air intake device according to the invention is especially advantageous because the emission of noise, especially, is greatly diminished in a simple manner by matching the size of the aperture admitting the volume of air to the engine speed. A particular size of the aperture is optimum for each speed of the internal combustion engine, a small diameter at low speeds leading to a minimum emission of noise.
According to the invention, at lower speeds, i.e., at a low air intake volume, only the inner tube is open, and not until the engine speed or intake air volume increases is a variably expandable airway added between the inner tube and the outer tube. When a plurality of inner tubes is used, the variable supplemental airways can also be provided between the additional inner tubes. The structural configurations of the variable air intake apertures described hereinafter are all equally applicable in each case.
The variable airway apertures are realized in a simple manner by means of a passive flap valve mechanism, which is formed in the area between the tubes which is set by fin-like spacing means. To open the valve mechanism all that is needed in this case is an increase in the aspiration pressure, for example, when the speed of the internal combustion engine increases.
In an especially advantageous manner the flap valve mechanism is made in the form of a resilient sealing lip which is fixed at one end and in the free portion it can be moved away from the other tube surface such that it partially or entirely opens the supplemental airway aperture. This resilient sealing lip is preferably made from a temperature-stable elastic material, e.g., an elastomer, TPE or the like, so that the opening action is largely independent of temperature. The free, movable parts of the sealing lip are made as long as possible, in this case, in order to promote temperature independence.
To improve the opening action the resilient sealing lip is additionally slit at the free end, so that the free parts will be still more movable. Any needed pressure of the free part against the other tube can be brought about simply by an annular spring.
The additionally possible geometric embodiments of the resilient sealing lip and the best arrangement in each case, either at the intake opening, at the outlet opening or in between, will depend on the particular application, which is determined by the type and/or conditions of the
REFERENCES:
patent: 5749342 (1998-05-01), Chao
Andress Heinz
Loy Roland
Mueller Heinz
Benton Jason
Filterwerk Mann & Hummel GmbH
Kamen Noah P.
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