Internal-combustion engines – Intake manifold
Patent
1998-05-01
1999-11-30
Wolfe, Willis R.
Internal-combustion engines
Intake manifold
12318461, 12318438, F02M 35104, F02M 35112
Patent
active
059923695
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an intake device made of thermoplastic synthetic resin material, especially for the intake air of an internal combustion engine.
A press release from Bayer AG dated Nov. 3, 1993 indicates that a simple method for making intake stubs for automobiles comprises making half shells by the injection-molding process. Two of these molded parts at a time are extrusion-coated with plastic at the contact lines in such a fashion that an air-tight interlocking connection results. The advantage of this method is said to be that parts with smooth surfaces result. This process has been improved further in the meantime and can now be used with a plurality of intake manifolds and/or intake devices. In addition to extrusion-coating, the friction-welding process has also proven to be a successful technique for connecting the two half shells.
An intake manifold is known from EP 5933 B1, which likewise consists of two half shells. These shells are welded and/or glued to one another. One disadvantage of this half-shell technology is that very complex manifold geometries considerably complicate the connection of the half-shells. Especially in situations where manifolds intersect or are interlaced with one another, it is no longer possible to create a connection by extrusion-coating or friction-welding. In these cases, the core melt-out method has been used, but this involves a higher expense.
It is therefore the object of the invention to provide an intake device made of thermoplastic synthetic resin material in which manufacturing can be performed by the half-shell technique despite the use of complex shapes. This object is achieved by the invention as described hereinafter.
The main advantage of the invention is that the intake device is composed of two intake manifolds, with both intake manifolds being produced by the half-shell technique and the second intake manifold can be connected with the first intake manifold in the flange area.
In one embodiment of the invention, both intake manifolds terminate in a common collecting chamber, especially in the air-collecting chamber located downstream from an air filter.
In a preferred improvement, the two half-shells are connected together using plastic welding technology. Friction welding technology as well as ultrasonic welding technology have proven successful in this regard. Of course it is also possible to join the half-shells to one another by means of the extrusion-coating process, and also by using suitable gluing or fitting techniques.
In another embodiment of the invention, the intake manifolds are provided in the vicinity of the connecting flange with a common opening that joins the intake manifolds. A resonance switching valve is fitted into this opening, said valve connecting the two intake manifolds in terms of flow above a certain engine rpm to provide increased engine power in the upper rpm range. This connection can also be designed to serve as a mounting location for the two engine intake manifolds, thus increasing stability.
In another embodiment of the invention, the second intake manifold is provided with a plug-in connection in the connecting area. This assures an especially simple and reliable connection that requires a low manufacturing cost.
Inasmuch as the first intake manifold is connected with the connecting flange, the flange is suitable as the support for the second intake manifold because of its higher stability. Of course, it is also possible to provide the second intake manifold with supporting functions that make it possible to couple the first intake manifold to the second intake manifold.
These and other features of preferred embodiments of the invention follow from the specification and the drawings as well as from the claims, with the individual features being implemented either individually or severally in the form of subcombinations in the embodiments of the invention and being usable in other areas and representing advantageous embodiments that can themselves be protected, for which protection is hereby claimed.
The inv
REFERENCES:
patent: 1271779 (1918-07-01), Schroeder et al.
patent: 4301775 (1981-11-01), Smart et al.
patent: 4926802 (1990-05-01), Morris et al.
Filterwerk Mann & Hummel GmbH
Hairston Brian J.
Wolfe Willis R.
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