Patent ID: 8113185

Claim:
A device for separating oil, comprising: a blow-by gas passage provided to a head cover of an engine and discharging blow-by gas introduced from the engine therethrough; and a separator disposed in the blow-by gas passage and separating oil from the blow-by gas; wherein the separator includes: a pre-separator into which the blow-by gas enters and separates the oil from the blow-by gas, the pre-separator having inlet hole formed upwards and spiral guide vane formed on inside wall of the inlet hole and configured to twist the blow-by gas passing through the spiral guide vane in order to increase a flow rate of the blow-by gas; and a main separator separating the oil from the blow-by gas passing the pre-separator, wherein the blow-by gas passage includes: an inlet, wherein the blow-by gas introduced to the head cover flows upwards to enter the inlet; an outlet formed in the head cover to discharge the introduced blow-by gas; and a flow path connecting the inlet to the outlet, wherein the flow path is bent at least once.