Breathing system in combustion engine

摘要

A breathing system in a combustion engine includes an air cleaner ( 3 ) for purifying air to be supplied to the engine. The air cleaner ( 3 ) includes a cleaner casing ( 30 ) having a blow-by gas inlet port ( 33 ) and an intake air discharge port ( 34 ). The breathing system also includes a breather passage ( 8 ) having first and second breather passage portions. The first breather passage portion is fluidly connected with the inlet port ( 33 ) for communicating a crank chamber ( 1 a) to a portion of an interior of the air cleaner ( 3 ) downstream of the cleaner element ( 50 ). The second breather passage portion fluidly connects the blow-by gas inlet port ( 33 ) and the intake air discharge port ( 34 ) and has a drain hole ( 95 ) for draining into the cleaner casing ( 30 ) a water component, separated from a blow-by gas (G) flowing through the breather passage ( 8 ).