Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture
Patent
1999-07-02
2000-11-21
McMahon, Marguerite
Internal-combustion engines
Charge forming device
Crankcase vapor used with combustible mixture
F02M 1302
Patent
active
061488062
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a subunit for a machine driven by an internal combustion engine according to the preamble of claim 1.
Such subunits are described, for example, in German Petty Patent 1,883,625. A valve system is described for connecting the air intake duct or the vacuum zone of a carburetor to the crankcase of an internal combustion engine wherein gases which are forced past the piston of the engine into the crankcase are returned to the engine cylinders and consumed together with the combustible mixture produced by the carburetor.
Furthermore, a valve unit of this kind is disclosed in U.S. Pat. No. 3,139,080 which describes means for the elimination of crankcase gases, since these crankcase gases are considered a source of atmospheric pollution.
If it is desired to use such subunits in modern motor vehicles or other equipment driven by internal combustion engines, it is disadvantageous that the known subunits have corresponding outside dimensions and a correspondingly great weight.
The size of the component could be reduced, which would result in a weight reduction. It is, however, disadvantageous that the space required by the various individual units and their connecting lines is great and so is their weight.
The invention is thus addressed to the problem of improving a subunit of the kind described above so as to result in a subunit which will be easier to install, lighter, cheaper and more compact.
This problem is solved according to the invention in that components are put together in a module and that means are provided whereby the module can be connected to the internal combustion engine. It is advantageous that both the manufacturing costs of the individual functional units and the costs of final assembly plus weight can be reduced. Due to its structural integration, synergies between the different functional units are achieved, which contribute to the said cost saving. The provision of modules for the final assembly also simplifies the logistics. The modular construction of the subunit also has a favorable effect on the recycling of the subunits. The combining of the functional units in one module furthermore permits rapid reaction to changing marketing plans.
An advantageous embodiment of the invention provides for the integration in the module of a support body which can be connected to the internal combustion engine and to which the components of the module are fastened. This support body gives the module a structure which on the one hand defines how the module is to be connected to the internal combustion engine and how the individual components of the module are to be arranged. One possibility would be, for example, to use the air filter case as a support body.
Another advantageous embodiment of the invention provides for the module to contain as a component a crankcase pressure control valve and an idling vacuum valve which are combined in a single functional unit resulting in savings both in weight and in cost.
In an advantageous embodiment of the invention, the device communicates with the crankcase and/or the filter chamber, especially on the clean-air side of the latter. This assures that the crankcase gases responsible for emissions remain in the overall system of the internal combustion engine and are delivered to the combustion process.
An advantageous embodiment of the invention provides that the module can be expanded with additional components. For example, it would be conceivable to bring together all essential valve subunits which are connected with the operation of an internal combustion engine.
An embodiment of the invention provides that the module comprise as an additional component an oil filler tube and/or an oil dip stick and/or an AKF valve as described in German Patent 42 05 101 in claims 2-5 as well as in the description, col. 1, line 51 to col. 2, line 13, and/or a throttle valve and/or the device for operating same. The advantage lies in the combining of functional groups which are in a working relationship, since in this manner the paths of communication, t
REFERENCES:
patent: 4169432 (1979-10-01), White
patent: 5080082 (1992-01-01), Mueller et al.
Filterwerk Mann & Hummel GmbH
McMahon Marguerite
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