Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1998-10-01
1999-10-19
McMahon, Marguerite
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
12318449, F02B 2702
Patent
active
059671076
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention refers to a valve arrangement for intake systems in an internal combustion engine, said intake system comprising a separate intake manifold for each engine cylinder with a first manifold portion extending between the intake valve/-valves of the respective cylinder and a first air distribution chamber, and a second manifold portion forming a connection between the first air distribution chamber and a second air distribution chamber, at which a valve arranged for each cylinder in a first position of use connects the intake manifold portions and in a second position of use opens these intake manifold portions towards the first air distribution chamber, in such a way that the valves are simultaneously actuatable between these two positions uf use by means of control means with regard to the motor speed.
BACKGRUND OF THE INVENTION
In active intake systems for multiple cylinder internal combustion engines controllable valve throttles are used for adapting the length of the intake channels to the working conditions of the engine. This solution admits the utilization of the resonance frequency of the intake system for an advantageous volumetric efficiency within different motor speed areas.
For example EP-A-0492122 discloses an intake system with an air distribution chamber, which is connected to the intake valves of the motor by means of intake manifolds. Extension pipes a r moveably mounted on an axle within the air distribution chamber, in such a way that the manifolds can shift between an active position in which they connect as extensions to the intake manifolds, and a passive position in which the extension pipe ends are located at a distance from the intake manifold ends. This known solution is mainly adapted for applications where the extension pipes can be relatively short.
In intake systems where a greater change in length of the intake channels is needed when shifting from one to another position of use, the construction according to EP-A-0492122 will be very space requiring. When designing the engine house of a private car one must consider that many components and system have to be packed together in a narrow space and at the same time be accessible for maintenance and repair. It is therefore advantageous if the intake system can be made compact. Besides the known solution in such case involves that a relatively big mass has to be displaced very quickly from one position to another. This calls for high demands on the operating mechanism including the bearings. A condition for the invention is besides that it shall cope with high demands on the reliability.
OBJECT OF THE INVENTION
The object of the present invention is therefore to obtain a valve arrangement which provides a compact construction of the intake system and which besides is simple to shift over from one functional position to another.
SOLUTION OF THE PROBLEM
This has accordning to the invention been obtained in an intake system described above, by the fact that for each cylinder there is arranged a valve body designed as a connector pipe, which is rotatable about an axle and which in the first position of use forms a tight connection between the two manifold portions and in a second position of use is located outside the ends of the manifold portions, so that these are exposed.
Preferred embodiments of the invention are disclosed in the subclaims.
DESCRIPTION OF THE DRAWINGS
The invention will below be described more in detail with reference to the embodiments shown in the accompanying drawings, in which
FIG. 1 schematically shows an intake system with a valve arrangement according to the invention, which is adapted to a six cylinder internal combustion engine,
FIG. 2 is a diagram illustrating the technical effect of the intake system according to FIG. 1, and
FIG. 3 is a section according to the line III--III in FIG. 1, which shows a preferred embodiment of the intake system with the valve arrangement according to the invention.
DESCRIPTION OF EMBODIMENTS
FIG. 1 shows an intake system f
REFERENCES:
patent: 5105774 (1992-04-01), Piccini
patent: 5309883 (1994-05-01), Pischke
patent: 5787851 (1998-08-01), Sakurai et al.
patent: 5787852 (1998-08-01), Muramatsu et al.
patent: 5813380 (1998-09-01), Takahashi et al.
Karlsson Jan A G
Petren Anders H
AB Volvo
McMahon Marguerite
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