Internal-combustion engines – Intake manifold – For in-line engine
Patent
1998-03-02
1999-10-12
McMahon, Marguerite
Internal-combustion engines
Intake manifold
For in-line engine
12318447, F02M 3510
Patent
active
059641940
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an inlet manifold for an internal combustion engine equipped with a fuel-supply installation preferably by injection, particularly of the so-called "multipoint" type comprising, for each cylinder of the engine, at least one injector which injects fuel into an induction pipe of the inlet manifold that allows air into the engine, directly upstream of the cylinder head of the engine and of the inlet valve or valves of the corresponding cylinder.
More specifically, the invention relates to an inlet manifold of this kind, more particularly intended to be fitted to a controlled-ignition engine and which comprises: for supplying the engine, generally by means of a variable-delivery valve such as a butterfly valve, and equipped with at least one flange for attaching it to at least one cylinder head of the engine, the said flange or flanges having at least one opening for supplying each cylinder of the engine, each supply opening opening, on the one hand, into the envelope and, on the other hand, into a face for attaching the flange to the said cylinder head, and are cylinders in the engine, and which are mounted in the envelope so that each tube supplies a corresponding cylinder with air which it receives via its inlet in the plenum chamber and which it transmits to a corresponding opening in a flange via its outlet connected by leaktight connecting means to the said supply opening.
The manufacturing of manifolds of this type by molding two half shells of complementary shapes corresponding to the shape of the envelope and which are intended to be secured together via their peripheral edge, along a parting plane, to form the envelope is already known.
The outer part, with respect to the center of curvature of the bent tubes, of the collection of air tubes is formed by the bottoms of cavities molded as hollows in each of the two half shells and which extend one another when the half shells are closed one against the other. Similarly, the inner part of the collection of air tubes is formed by the bottoms of cavities molded as hollows in at least two molded inserts, generally made of the same material as the half shells, for example a moldable synthetic material, preferably a thermoplastic such as polyamide, and which can be filled with reinforcing fibers, each attached to one of the half shells respectively, so that the cavities of the inserts also extend one another when the half shells are secured together. This method therefore makes it possible to form the tubes by the cooperation of surfaces presented by at least four molded parts (two half shells and two inserts) joined together.
A manifold produced in this way is suitable for fitting to a diesel engine, because of the low pressure gradient between the atmosphere and the plenum chamber of the manifold when the engine is running.
By contrast, in a controlled-ignition engine, where this pressure gradient may attain higher mean values, of the order of 70 kPa, when the engine is running, the presence of air leaks between the parts which are assembled to form the air induction tubes, contained inside the plenum chamber has the effect of altering the acoustic impedance of the manifold and thus of lowering the efficiency of the engine.
It is therefore essential for a manifold of this type to be correctly sealed, especially at the air tubes.
For this, a seal needs to be made between the inserts and the half shells by depositing runs of an appropriate polymerizable material, which is a lengthy and tricky operation which combines with the difficulty of producing, to tight tolerances, parts to be assembled to define the air tubes accurately.
The result of this is that a manifold of this kind may become expensive to produce.
The problem underlying the invention is that of proposing a manifold which is economical to produce, essentially made of a thermomoldable synthetic material and semi-modulable because a manifold of this kind can be acoustically matched to an entire family of engines of different cylinder capacities by adjusting the dimensions,
REFERENCES:
patent: 4111163 (1978-09-01), Ederer et al.
patent: 5150669 (1992-09-01), Rush et al.
patent: 5638784 (1997-06-01), Ohsuga et al.
patent: 5651338 (1997-07-01), Pacheco et al.
patent: 5657727 (1997-08-01), Uchida
Pontopiddan Michael
Sonori Michele
Magneti Marelli France
McMahon Marguerite
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