Intake manifold for internal combustion engine

Details Intake manifold for internal combustion engine Intake manifold for internal combustion engine

1997-11-07

1999-04-27

McMahon, Marguerite

Internal-combustion engines

Intake manifold

Manifold having plenum

F02M 3510

Patent

active

058968385

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, as disclosed in U.S. Pat. No. 5,003,933: for supplying the engine via a variable-delivery valve, such as a butterfly valve, and equipped with at least one flange for attaching it to a cylinder head of the engine, 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 said cylinder head, and shape, and of which there are at least as many as there are cylinders in the engine, and which are mounted in the envelope so that each tube supplies a corresponding cylinder with air which the tube receives via its inlet in the plenum chamber and which the tube transmits to a corresponding opening in a flange via its outlet connected to said supply opening by leaktight connection means comprising a tubular end piece in which the outlet end part of said tube is held in said envelope, with the insertion of at least one flexible seal between the tube and the end piece.
The manufacturing of similar manifolds by molding two half shells with complementary shapes corresponding to the shape of the envelope and which are intended to be secured together via their peripheral edge, in a parting plane, to form the envelope is already known.
The outer part, with respect to the center of curvature of the curved tubes, of the collection of air tubes may be 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 may be formed by the bottoms of cavities molded as hollows in two molded inserts, generally made of the same material as the half shells, for example of polyamide 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, the four parts to be assembled to define the air tubes accurately.
In the case of a manifold according to U.S. Pat. No. 5,003,933, each air tube is either made as a single piece with the desired shape, as already mentioned above, or made by assembling two complementary halves molded to shape. However, this

REFERENCES:
patent: 4111163 (1978-09-01), Ederer et al.
patent: 5063885 (1991-11-01), Yoshioka
patent: 5150669 (1992-09-01), Rush, II et al.

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