| 摘要 |
PROBLEM TO BE SOLVED: To allow oil in blow-by gas to be suitably separated into gas and liquid, and to enable improvements in working efficiency and durability of a negative pressure pump for putting the inside of an engine case under negative pressure for restraining a pumping loss.SOLUTION: An engine includes a rotary gas-liquid separator 36 for separating oil in the blow-by gas in a crankcase 22 into gas and liquid, and a negative pressure pump 37 for bringing the pressure in the crankcase 22 into negative pressure. The gas-liquid separator 36 is arranged in the crankcase 22, the negative pressure pump 37 is arranged in a blow-by gas passage of reaching an air cleaner from the gas-liquid separator 36, the negative pressure pump 37 turns the pressure in the crankcase 22 into negative pressure by sucking air including the blow-by gas from which the oil is separated by the gas-liquid separator 36, and the gas-liquid separator 36 has the function of reducing the pressure by delivering the air of including the blow-by gas. |
