OIL SEPARATION STRUCTURE OF BLOW-BY GAS DISPOSING FRESH AIR PASSAGE

摘要

PROBLEM TO BE SOLVED: To separate an oil component of oil mist contained in blow-by gas backwardly flowing in a blow-by gas disposing fresh air passage during high load operation. SOLUTION: A protrusion 11 having a cylindrical shape of which tip is closed and protruding upward along the perpendicular direction and of which inside communicates with the blow-by gas disposing fresh air passage 8 is formed on a lower side surface 10a at a lower part of an intake passage (the clean side 10 of an air cleaner 1) along the perpendicular direction in the upstream of a throttle valve. An opening part 13 is provided on a side surface of the base end side of the protrusion 11 so that an air pocket part 14 is formed on the tip side. A vertical wall 17a adjacently confronting the opening part 13 is formed on the lower side surface 10a of the intake passage (the clean side 10 of the air cleaner 1).