Internal-combustion engines – Intake manifold – For in-line engine
Reexamination Certificate
2000-06-28
2001-11-20
Kamen, Noah P. (Department: 3747)
Internal-combustion engines
Intake manifold
For in-line engine
C123S184530
Reexamination Certificate
active
06318326
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a suction system for a combustion air supply to an internal combustion engine, in particular for a motor vehicle, having an induction funnel which at an open end has an induction pipe, and an air manifold, on which cylinder-specific suction pipe arms, which can be connected to a cylinder head of the internal combustion engine, are arranged.
2. Discussion of the Prior Art
In suction systems of this nature, with construction spaces which are becoming increasingly optimized or with an available structural space in an engine compartment becoming increasingly small, the problem arises of how to provide sufficient and, above all, uniform supply of combustion air to individual cylinders of the internal combustion engine. For reasons of gas dynamics, sharp diversions of an intake air flow were previously to be avoided or were associated with considerable disadvantages, since the result is pressure losses and an uneven distribution of the intake air, for example in the air manifold.
SUMMARY OF THE INVENTION
The present invention is therefore based on the object of providing an improved suction system of the type described above in which the above-mentioned drawbacks are overcome and a component which is optimized in terms of its structural volume is provided while, at the same time, avoiding pressure losses.
For this purpose, according to the invention the induction funnel and the air manifold are formed in a common housing, a partition of the housing separating the induction funnel from the air manifold.
This has the advantage that a compact, integral arrangement which requires less structural space is created by the fact that the induction funnel and air manifold are arranged close together.
To utilize in particular structural spaces which are long rather than wide, the induction funnel and the air manifold, in the common housing, are designed in such a manner that they extend substantially parallel, in particular axially parallel, to one another. This results in a correspondingly elongate component.
In a particularly preferred embodiment of the invention, a slot which connects the induction funnel to the air manifold is formed in the partition, which slot preferably extends substantially parallel, in particular axially parallel, with respect to the induction funnel and/or the air manifold. Advantageously the partition, on a side which extends substantially parallel, in particular axially parallel, with respect to the induction funnel and/or the air manifold ends, at a predetermined distance from a housing wall, with a free end which forms the slot, which free end, in an advantageous configuration, is designed in the form of a bead as seen in cross section. As a result, a uniform transfer of air without pressure losses and with a good air/EGR uniform distribution is ensured over the entire longitudinal extent of the induction funnel or air manifold despite the fact that the intake air flow is diverted sharply in order to optimize the structural space. In this context, “EGR” means exhaust gas recirculation into the intake air flow.
This effect is promoted still further by the fact that the induction funnel has a cross-sectional profile which narrows in the direction away from the induction pipe. As a result of the narrowing cross section, a flow velocity of the intake air flow increases with increasing distance from the induction pipe, in accordance with the laws of fluid dynamics and/or because of a constant flow pressure. As a result, the passage of air from the induction funnel to the air accumulator becomes even more uniform over the entire length of the slot.
Further features, advantages and advantageous configurations of the invention are given in the following description of the invention with reference to the appended drawings.
REFERENCES:
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patent: 37 30 817 C2 (1989-06-01), None
patent: 35 30 817 (1994-05-01), None
Cohen & Pontani, Lieberman & Pavane
Kamen Noah P.
Volkswagen AG
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