Internal-combustion engines – Multiple cylinder
Patent
1991-11-07
1992-10-20
Okonsky, David A.
Internal-combustion engines
Multiple cylinder
F02M 3510
Patent
active
051561174
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a suction pipe arrangement for a multicylinder internal combustion engine with two banks of cylinders in V formation, corresponding to the introductory portion of claim 1.
In a known suction pipe arrangement of this type (European-A 0 201 180), a valve element in the form of a flap is provided for each of the second openings. This flap is disposed on a shaft, which is used by all the flaps and extends in the longitudinal direction through the intake manifold. Particularly in the case of an internal combustion engine with a plurality of cylinders, such as 6-, 8- or 12-cylinder internal combustion engines, providing each of the second openings of each individual suction pipe with its own valve element, results in a very large number of valve flaps, which must be synchronized with one another and which, moreover, because of the oscillations arising in the intake system, tend to chatter.
For internal combustion engines with one bank of cylinders, the construction of the intake manifold chamber with a circular cross section and the providing of a rotary slide valve in this intake manifold chamber with one outlet opening per individual suction pipe is known (German Auslegeschrift 34 33 653). By rotating the rotary slide valve, the length of the swing pipe can be changed continuously. This arrangement cannot be used for an internal combustion engine with two banks of cylinders in V formation, because the individual suction pipes for the one bank of cylinders extends in the clockwise direction about the intake manifold chamber and that for the other bank of cylinders extends in the opposite direction, so that, upon rotating the rotary slide valve, the swing pipe length of the one individual suction pipes would be lengthened and that of the other individual suction pipes would be shortened. Of course, this problem does not exist if the flaps are controlled as in EP-A 0 201 180.
It is an object of the invention, to provide a suction pipe arrangement of the type, in which the second openings of the individual suction pipes are controlled with significantly less effort than in the construction of EP-A 0 2091 180, from which the invention starts out.
Pursuant to the invention, this objective is accomplished by the features given in the characterizing clause of claim 1.
Due to the asymmetric disposal and construction of the control slits (two slits for the openings of each first individual suction pipe, one longer slit for the openings of each second individual suction pipe), it is possible to control the second openings of all individual suction pipes from a single valve element, namely the rotary slide valve. Not only is the structural expense reduced considerably by these means in comparison to the state of the art, but an identical control system for all second openings is automatically ensured. Aside from these structural advantages, a higher delivery rate is achieved in this operating range and a cross sectional constriction is avoided owing to the fact that the first openings are not closed completely when the rotary slide valve is switched over from its first to its second position.
The control slit for controlling the openings of the second individual suction pipe is relatively long. Therefore, particularly for strength reasons, it may be advisable to divide this slit by means of a cross member into two partial slits, this cross member being arranged so that one of the partial slits corresponds to the size of the second opening. It is another function of the cross member to optimize by the shape of its cross section the flow from the distribution manifold into the second opening.
The control slit, which acts together with the two openings of the first individual suction pipe, can also be divided by a cross member in order to achieve higher strength. For this purpose, the position of the cross member is selected so that the still free cross section for controlling the first opening is not reduced. The inflow from the distributor manifold into the first opening is optimized by appropriate
REFERENCES:
patent: 4440120 (1984-04-01), Butler
patent: 5080051 (1992-01-01), Hitomi et al.
Clos Richard
Muller Robert
Audi A.G.
Okonsky David A.
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