Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture
Patent
2000-01-28
2000-12-12
McMahon, Marguerite
Internal-combustion engines
Charge forming device
Crankcase vapor used with combustible mixture
F01M 1302
Patent
active
061584231
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a crankcase ventilation valve for an internal combustion engine, with a valve housing, a gas inflow duct connected to the interior of the crankcase, a gas outflow duct connected to an air intake duct of the internal combustion engine, and a diaphragm which divides the valve housing into a crankcase-side inner chamber and an outer chamber and which has a ventilation valve disk diaphragm, together with the ventilation valve disk, selectively open or close the gas outflow duct, depending on the pressure difference between the two chambers,
2. Discussion of the Prior Art
A crankcase ventilation known, for example, from DE 44 06 986 A1, EP 0 459 031 B1, DE 27 53 335 C2 and EP 0 730 086 A1 is a closed system for the recirculation of pollutants, such as, for example, oil vapor and unburnt hydrocarbons, which pass along the pistons into the crankcase interior, out of the crankcase to the engine combustion system, so that these pollutants do not escape into the environment. In this case, an intake duct of the internal combustion engine is connected to an outlet of the crankcase ventilation. Since a greater or lesser vacuum prevails in this intake duct, depending on the operating state of the internal combustion engine, precautions must be taken to ensure that this vacuum is not propagated to too great an extent into the crankcase, since air would otherwise be sucked into the crankcase from outside in an undesirable way, for example via a crankshaft seal.
For this purpose, DE 44 06 986 A1 proposes a generic crankcase ventilation valve. Here, a bore is provided in the cover of the valve housing, said bore connecting the outer chamber on a diaphragm side facing away from the crankcase to the ambient pressure. The disadvantage of this, however, is that the gas outflow duct is arranged on the crankcase side in relation to the chamber at ambient pressure and it is therefore necessary to have a complicated routing of the gas duct out of the ventilation valve through the crankcase to the air intake duct of the internal combustion engine. A modification may therefore be necessary if the internal combustion engine has different installation positions with different paths from the ventilation valve to the air intake duct of the internal combustion engine.
SUMMARY OF THE INVENTION
The object on which the present invention is based, therefore, is to provide a crankcase ventilation valve of the above-mentioned type with which the above-mentioned disadvantages being are overcome. The valve is also capable of being used universally, irrespective of the installation position of the internal combustion engine.
This object is achieved, according to the invention, by means of a crankcase ventilation valve having a valve housing, a gas inflow duct connected to an interior of the crankcase, a gas outflow duct connected to an air intake duct of the internal combustion engine, a diaphragm arranged in the housing so as to divide the valve housing into a crankcase-side inner chamber and an outer chamber, a ventilation valve disk, the diaphragm together with the ventilation valve disk being operatively arranged to selectively open and close the gas outflow duct depending on a pressure difference between the inner chamber and the outer chamber, the outer chamber of the valve housing being connected to the gas inflow duct, and a ventilation duct provided on the crankcase side so as to connect the inner crankcase-side chamber of the valve housing to ambient pressure.
For this purpose, according to the invention, there is provision for connecting the outer chamber of the valve housing to the gas inflow duct and, furthermore, for forming on the crankcase side a ventilation duct which connects the inner crankcase-side chamber of the valve housing to ambient pressure.
The advantage of this is that the gas outflow duct of the crankcase ventilation valve, together with a device for connection to the air intake duct of the internal combustion engine, is arranged on a si
REFERENCES:
patent: 4167164 (1979-09-01), Bachmann
patent: 4580543 (1986-04-01), Aoki
patent: 5090393 (1992-02-01), Holch
patent: 5335641 (1994-08-01), Schnabel
McMahon Marguerite
Volkswagen AG
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