Internal-combustion engines – Intake manifold
Reexamination Certificate
1999-04-09
2001-05-08
McMahon, Marguerite (Department: 3747)
Internal-combustion engines
Intake manifold
C123S184220
Reexamination Certificate
active
06227159
ABSTRACT:
The invention is based on an air guiding system for an internal combustion engine.
The air guiding system is intended for an internal combustion engine of a motor vehicle. One such air guiding system is known from German Patent 38 42 248, for example. The known air guiding system has an air inlet opening, an intake conduit adjoining the air inlet opening downstream, and an outlet opening connected to a gas inlet opening of the combustion chamber of an internal combustion engine. The outlet opening is located downstream of an outlet conduit. The intake conduit and the outlet conduit are embodied as a diffusor, in order to provide noise abatement. Downstream of the intake conduit or upstream of the outlet conduit, there is a deflection chamber that deflects the gas stream by 180° from the intake conduit into the outlet conduit. Also located at the inlet to the outlet conduit is an air filter for filtering the air, flowing through the air guiding system, for the engine; the air filter is accessible only by removing the housing of the deflection chamber.
A disadvantage of the known air guiding system is that the air filter is relatively poorly accessible, and installing and removing the air filter entails relatively major assembly effort and expense. Moreover, the air filter has a relatively small usable filter area, so that the air stream in the air guiding system is exposed to a relatively high flow resistance in the region of the filter. Another disadvantage of the known air guiding system is that it requires a relatively large amount of space in the engine compartment of the motor vehicle, and a relatively large installation space must therefore be made available for the air guiding system.
ADVANTAGES OF THE INVENTION
The air guiding system according to the invention has the advantage over the prior art that the air filter can be installed in the air guiding system without a major assembly effort and expense and if maintenance is needed can be replaced relatively simply. The intake conduit acts simultaneously as a housing for the air filter, so that the hollow space in the intake conduit is utilized as a filter chamber. A high packing density of the components in the intake region of the air guiding system is thereby attained, and the installation space required for the air guiding system is reduced further. Overall, an extremely compact design of the air guiding system is attained, and at the same time the volumetric region through which unfiltered crude air flows is reduced to a minimum.
The intake conduit may be closable with a cap on the side toward the air inlet opening, so that once the cap is removed the air filter can be replaced with only a few manual operations.
The air filter is preferably embodied as a component which is oriented axially to the longitudinal axis of the intake conduit and which devides an axial inner chamber from a peripheral outer chamber. Because of the axial alignment of the air filter, an especially large filter area is achieved, and as a result the flow resistance exerted by the air filter is advantageously reduced. An especially compact and at the same time dimensionally stable component is obtained if the air filter is embodied in the form of a hollow cylinder.
For an air guiding system with a gas guiding chamber which has one wormlike curved region and one region ducted through the wormlike curved region, an especially space-saving overall arrangement is obtained if the intake conduit that receives the air filter is integrated with the ducted region. In this way, the volume already present inside the wormlike curved region is utilized in an optimally space-saving way. A throttle device may also be integrated into the air guiding system without a major effort or expense.
REFERENCES:
patent: 3747303 (1973-07-01), Jordan
patent: 4183332 (1980-01-01), Hofbauer et al.
patent: 4440555 (1984-04-01), Chichester
patent: 4932490 (1990-06-01), Dewey
patent: 5575247 (1996-11-01), Nakayama et al.
patent: 5769045 (1998-06-01), Edwards et al.
patent: 5950586 (1999-09-01), Ropertz
Benton Jason
Greigg Edwin E.
Greigg Ronald E.
McMahon Marguerite
Robert & Bosch GmbH
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