Two-stage filtration assembly for a diesel engine crankcase ventilation system

A crankcase ventilation system interfaced between a crankcase port and an exhaust port of a Diesel engine, comprising:

• an evacuator communicating with the exhaust port;
• and
• an oil separator comprising a two stage filtration assembly, comprising:
• a housing having a first stage chamber communicating with the crankcase port and a second stage chamber communicating with said first stage chamber, said second stage chamber communicating with said evacuator;
• a first stage filtration assembly communicating with said first stage chamber and the crankcase port, said first stage filtration assembly including a first filtration media;
• and
• a second stage web filtration assembly disposed in said second stage chamber, said second stage filtration assembly including a second stage filtration media;
• wherein crankcase air exiting the crankcase port passes through said housing under urging of said evacuator, wherein the crankcase air passes serially through said first and second filtration media before exiting into the exhaust port;
• and
• wherein said second stage filtration assembly further comprises:
• a perforated can having a first end and an opposite second end, said can defining a cavity therewithin;
• a first end cap connected to said first end, said first end cap having an aperture aligned with said cavity;
• and
• a second end cap connected to said second end, said second end cap closing said cavity at said second end;
• wherein said web filtration media is pleated and overlays said can and is trapped between said first and second endcaps.

A two-stage filtration assembly for a crankcase ventilation system comprising:

• a housing having a first stage chamber and a second stage chamber communicating with said first stage chamber;
• a first stage filtration assembly communicating with said first stage chamber, said first stage filtration assembly including a first filtration media;
• and
• a second stage filtration assembly disposed in said second stage chamber, said second stage filtration assembly including a second stage filtration media;
• wherein air passing through said housing serially passes through said first and second filtration media;
• wherein said first stage filtration assembly further comprises a passageway formed therein which allows oil from said second stage filtration assembly to pass therethrough;
• and
• wherein said second stage filtration assembly is mounted at an acute angle with respect to a horizontal reference so that oil collected thereat drains therefrom into said passageway.