Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1996-01-22
1997-02-18
McMahon, Marguerite
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
137468, F02B 2702
Patent
active
056032960
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an intake apparatus of an engine, and more particularly to an improved arrangement of an intake control valve for switching intake passages in the intake manifold, and a driving mechanism for driving the intake control valve.
BACKGROUND ART
Generally, it is well known that the output performance of an engine according to the revolutions of the engine depends upon the length of intake passage formed in the intake manifold, that is, in case that the intake passage is made long, the output performance of the engine at low speed is raised due to the pulse effect of air, and where the intake passage is made short, the output performance of the engine at high speed is enhanced due to the inertia force of air.
Thus, there has been proposed an intake apparatus of an engine which is capable of enhancing the output performance of the engine by making the length of the intake passage of the intake manifold changeable and changing the length of the intake passage in accordance with the change of revolutions of the engine.
In a conventional intake apparatus, as shown in FIG. 2, both a short intake passage 4 and a long intake passage 5 are separately provided within an intake manifold 1 to form intake passages each of which extends from an intake section 2 to an intake port of an engine 3, and an intake control valve 6 is installed in the course of the short intake passage 4 in such a manner that the intake control valve 6 may be switched to close or open the intake passage 4 in accordance with the revolutions of the engine 3, thereby to allow air to flow into the engine 3 through the short intake passage 4 or the long intake passage 5. However, such a conventional intake apparatus has defects in that the long intake passage 5 is largely outwardly bent between the intake section 2 and the engine 3, and therefore the volume of the apparatus as a whole is bulky, and in that the quick response to rapid acceleration or rapid deceleration of an automobile deteriorates.
Meanwhile, the intake control valve 6 is, as shown in FIGS. 1 and 3, secured to a shaft 9 by means of, for instance, screws 8, and the shaft 9 is actuated by an actuator (not shown) in response to the operating condition of the engine so as to switch the intake control valve 6 between the long intake passage 5 and the short intake passage 4, thereby to allow air to flow from the intake section 2 into the engine through the long intake passage 4 or the short intake passage 5.
However, where the conventional shaft 9 shown in FIG. 1 is thermally expanded due to high temperature of engine, the intake control valve 6 contacts and interferes with the inner surface of the intake manifold 1, and as a result, the intake control valve 6 does not operate smoothly. Also, the conventional apparatus is disadvantageous in that a driving mechanism for driving the shaft is complex.
DISCLOSURE OF INVENTION
The present invention aims to solve the abovementioned problems raised in the conventional art.
It is therefore an object of the present invention no provide an apparatus of an engine with concise structure which is capable of changing the length of intake passage of an intake manifold, in accordance with the revolutions of the engine.
Another object of the invention is to provide an apparatus of an engine in which an intake control valve shaft can absorb the thermal expansion due to high temperature of the engine.
A further object of the invention is to provide an apparatus of an engine wherein a driving mechanism for driving an intake control valve is made compact.
To achieve these objects, an intake apparatus of the present invention is characterized in that an intake section into which air flows from air cleaner is provided within an intake manifold, a partition wall is installed concentrically with an intake manifold casing surrounding the intake section with respect to the intake section, between the intake manifold casing and the intake section in order to define a first intake passage and a second intake passage
REFERENCES:
patent: 451388 (1985-04-01), Heimovics
patent: 3521662 (1970-07-01), Bache
patent: 4793372 (1988-12-01), Gauthier et al.
patent: 5033417 (1991-07-01), Van Basshuysen et al.
patent: 5048469 (1991-09-01), Spray
patent: 5105774 (1992-04-01), Piccini
patent: 5143026 (1992-09-01), Brustle et al.
Daewoo Motor Co., Ltd.
McMahon Marguerite
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