Patent ID: 8794222

Claim:
An internal combustion engine crankcase ventilation rotating coalescer separating air from oil in blowby gas from a crankcase, comprising: a coalescing filter assembly comprising: an annular rotating coalescing filter element comprising a gas permeable fibrous filter media through which said blowby gas is passed so as to cause coalescence of oil on said filter media, the filter media having an inner periphery defining a hollow interior, and an outer periphery defining an exterior, an inlet port supplying said blowby gas from said crankcase to said hollow interior, an outlet port delivering cleaned separated air from said exterior, and an axial end cap on said annular rotating coalescing filter element, said axial end cap engages said inlet port; wherein direction of blowby gas flow is inside-out, namely radially outwardly from said hollow interior to said exterior; wherein oil in said blowby gas is forced radially outwardly from said inner periphery by centrifugal force caused by rotation of said coalescing filter element, to reduce clogging of said coalescing filter element otherwise caused by oil sitting on said inner periphery, and to open more area of said coalescing filter element to flow-through, whereby to reduce restriction and pressure-drop; and wherein said centrifugal force caused by rotation of said coalescing filter element pumps said blowby gas from said crankcase to said hollow interior.