Patent ID: 8047186

Claim:
An oil separating device for separating oil from crankcase gases, the oil separating device comprising: a housing having a first chamber in communication with a second chamber; an inlet interconnecting an engine with the first chamber so as to allow crankcase gases to be drawn into the first chamber; an outlet interconnecting the second chamber with an engine intake; an oil drain interconnecting the second chamber with an oil sump; a narrow wave-shaped passage disposed between the first chamber and the second chamber, the narrow wave-shaped passage having an amplitude and frequency, the narrow wave-shaped passage is defined by a first inner wall having a first undulating surface opposite a second inner wall having a second undulating surface mirroring the first undulating surface, and the first undulating surface is spaced a predetermined distance apart from the second undulating surface, the first and second undulating surfaces each having at least three undulations and wherein the narrow wave-shaped passage is disposed downstream of the first chamber and above the oil drain so as to allow oil found in crankcase gases passing from the inlet to the outlet to accumulate on the first and second inner walls and assist gravity in forcing the accumulated oil through the narrow wave-shaped passage into the oil drain.