Blow-by gas oil separator

Abstract

A blow-by gas oil separator that can prevent oil discharged into an oil receiving chamber from flowing backward into a cyclone includes: multiple cyclones to which blow-by gas of an internal combustion engine is supplied, each cyclone including, in a lower portion, an oil discharge opening that separates out and discharges oil mist contained in the blow-by gas, and including, in an upper portion, a blow-by gas outlet that allows the blow-by gas to flow out after oil separation; an oil receiving portion opposing the oil discharge openings of the cyclones; a blow-by gas circulation portion in communication with the blow-by gas outlets of the cyclones, and is connected to an air intake passage of the internal combustion engine via a circulation valve; and partition walls in an oil receiving chamber formed by the cyclones and the oil receiving portion to separate adjacent oil discharge openings from each other.

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         7 . A blow-by gas oil separator comprising:
 a plurality of cyclones to which blow-by gas of an internal combustion engine is supplied, each of the cyclones including, in a lower portion, an oil discharge opening that separates out and discharges oil mist contained in the blow-by gas, and including, in an upper portion, a blow-by gas outlet that allows the blow-by gas to flow out after oil separation;   an oil receiving portion that opposes the oil discharge openings of the plurality of cyclones;   a blow-by gas circulation portion that is in communication with the blow-by gas outlets of the plurality of cyclones, and is connected to an air intake passage of the internal combustion engine via a circulation valve; and   partition walls that are provided in an oil receiving chamber formed by the plurality of cyclones and the oil receiving portion, and separate adjacent oil discharge openings from each other,   wherein the partition walls are provided so as to be integrated with the cyclones, and a gap is formed between lower ends of the partition walls and the oil receiving portion.   
     
     
         8 . The blow-by gas oil separator according to  claim 7 , wherein the blow-by gas circulation portion includes an inner bottom portion that is lower with increasing distance from the circulation valve. 
     
     
         9 . The blow-by gas oil separator according to  claim 7 , wherein
 the blow-by gas circulation portion has an inner bottom portion in which the blow-by gas outlets are each formed, and   the inner bottom portion is provided with an oil channel along which oil can flow so as to move away from the circulation valve while avoiding the blow-by gas outlets, and a communication channel that can put a terminal side of the oil channel in communication with the oil receiving chamber.   
     
     
         10 . The blow-by gas oil separator according to  claim 9 , wherein the inner bottom portion is provided with a projection portion that separates one end side of the oil channel in a width direction from a blow-by gas outlet side. 
     
     
         11 . The blow-by gas oil separator according to  claim 9 , wherein a receding portion is formed at a terminal side of the oil channel, the receding portion is deeper than a channel portion on an upstream side of the terminal side of the oil channel, and the communication channel is open at a bottom portion of the receding portion.