Apparatus for ventilating the crankcase of a combustion engine

Details Apparatus for ventilating the crankcase of a combustion engine Apparatus for ventilating the crankcase of a combustion engine

2006-04-11

2006-04-11

McMahon, Marguerite (Department: 3747)

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

Reexamination Certificate

active

07025049

ABSTRACT:
The invention relates to a device for crankcase ventilation of an internal combustion engine, comprising a ventilation duct extending from the crankcase to an induction tract of the internal combustion engine, whereby at least one oil vapor separator causing a drop in pressure is arranged in said duct and a crankcase vacuum control valve is arranged upstream or downstream therefrom and can be adjusted according to the pressure in the crankcase such that a lower pressure threshold valve in the crankcase is respected. The novel device is characterized in that a discharge duct extending from the crankcase to the induction tract of the internal combustion engine is also provided, whereby a crankcase overpressure limiting valve is disposed inside said duct and can be adjusted in a pressure-dependent manner to ensure that an upper pressure threshold in the crankcase is not exceeded.

REFERENCES:
patent: 4901703 (1990-02-01), Humphries
patent: 5335641 (1994-08-01), Schnabel
patent: 5669366 (1997-09-01), Beach et al.
patent: 6505615 (2003-01-01), Pietschner
patent: 6892715 (2005-05-01), Norrick
patent: 2002/0088445 (2002-07-01), Weindorf et al.
patent: 2004/0112346 (2004-06-01), Ahlborn et al.
patent: 200 09 605 (2001-10-01), None
patent: 2 815 084 (2002-04-01), None
patent: WO 03/042513 (2002-05-01), None

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