Patent ID: 8573188

Claim:
An internal combustion engine with a cylinder head, comprising: at least one hollow camshaft; a crank housing, the at least one hollow camshaft taking in blow by gases containing oil mist from the crank housing, and where the at least one hollow camshaft is also an oil mist pre-fractionator for preliminary separation of oil from the blow by gases, and an oil mist post-fractionator that is subsequently and axially arranged on the end of the camshaft, and where the oil mist post-fractionator is arranged inside the crank housing, and wherein the oil mist post-fractionator is formed as an impactor, wherein at least one of the following is selected: i. the oil mist post-fractionator comprises an immersion tube projecting into the hollow camshaft, and ii. wherein at least one of the following is selected: a. an immersion tube of the oil mist post-fractionator, together with the hollow camshaft, forms a labyrinth seal, and b. between an outer circumferential surface of an immersion tube and an inner surface of the hollow camshaft, a ring seal is arranged.