Device for separation of oil, ventilation system, cylinder head cover and internal combustion engine

Abstract

A device for separation of oil droplets and/or oil mist from blow-by gases of an internal combustion engine is described. Also described is a ventilation system for ventilation of the crankcase of an internal combustion engine, a cylinder head cover and an internal combustion engine, which contain such a device.

1 - 14 . (canceled) 
     
     
         15 . A device for separation of oil droplets and/or oil mist from blow-by gases of an internal combustion engine, having a valve for control of the gas flow between a pressure side and a suction side of the device, the valve having at least one base plate, comprising:
 a first region of the base plate, in which there are disposed at least one first gas passage opening for passage of gas from the pressure side to the suction side of the valve and also, on the suction side of the base plate, at least one first valve closure for suction-side closure of the at least one first gas passage opening, and   a second region of the base plate which is disposed sidewards to the first region and in which there are disposed at least one second gas passage opening for passage of gas from the suction side to the pressure side of the valve and also, on the pressure side of the base plate, at least one second valve closure for pressure-side closure of the at least one second gas passage opening.   
     
     
         16 . The device according to  claim 15 , wherein the first valve closure has at least one first flexible tongue which is disposed on the suction side of the base plate. 
     
     
         17 . The device according to  claim 16 , wherein the first flexible tongue is configured such that at least one of the first gas passage openings is unclosable by the first flexible tongue. 
     
     
         18 . The device according to  claim 17 , wherein at least one of the first flexible tongues is attached flexibly to the valve body via at least one retaining arm such that it is movable between a first position, in which it closes the first gas passage openings covered by it, and a second position, in which it uncovers the first gas passage openings covered by it. 
     
     
         19 . The device according to  claim 15 , wherein the second valve closure has at least one second flexible tongue which is disposed on the pressure side on the base plate and is configured such that at least one of the second gas passage openings is closable by it. 
     
     
         20 . The device according to  claim 19 , wherein the second flexible tongue is pretensioned such that it closes the second gas passage opening below a predetermined positive pressure difference between the suction side and the pressure side, and opens the second gas passage opening above a predetermined positive pressure difference between the suction side and the pressure side. 
     
     
         21 . The device according to  claim 20 , wherein at least one of the second gas passage openings as support for the second flexible tongue has on the pressure side of the base plate an edge which protrudes in a web-shape from the base plate and extends circumferentially about the second gas passage opening. 
     
     
         22 . The device according to  claim 15 , wherein a circumferential edge has circumferentially the same height or is flattened in the direction of the mounting of the second flexible tongue or has an additional sealing element which extends circumferentially on the edge. 
     
     
         23 . The device according to  claim 15 , wherein at least one of a first or a second flexible tongue has an embossing which extends circumferentially about at least one of the first and/or second gas passage openings. 
     
     
         24 . The device according to  claim 23 , wherein the embossing is a bead-shaped embossing, or a circumferentially extending sealing element. 
     
     
         25 . The device according to  claim 15 , wherein at least one of the at least one first gas passage openings has a narrowed cross-section which acts as oil separator element. 
     
     
         26 . The device according to  claim 15 , wherein in at least one of the at least one first gas passage openings there is disposed a flow-deflection- and -guiding element as an oil separation element. 
     
     
         27 . The device according to  claim 26 , wherein the element is a screw-shaped element. 
     
     
         28 . A ventilation system for ventilation of the crankcase of an internal combustion engine, comprising:
 an intake duct with a compressor and a throttle valve, having an oil separator with a gas input chamber and at least two separate gas output chambers connected therewith,   a first ventilation pipe for connecting the crankcase of the internal combustion engine and the gas input chamber of the oil separator,   a first output pipe for connecting the first gas output chamber to the intake duct of the internal combustion engine before the compressor, and   a second output pipe for connecting the second output chamber to the intake duct of the internal combustion engine behind the throttle valve,   wherein in the first output chamber, there is disposed a device for separation of oil droplets and/or oil mist.