| 摘要 |
PURPOSE:To return blow-by gas into a suction passage in a positive pressure area by pressurizing the inside of a crankcase. CONSTITUTION:The outlet 12b of a blow-by gas passage 12 is provided at the throttled part 8a of a venturi part 8, with its opening directed to the lower- course side. A pressurizing pipe 14 has a pressure inlet 13 opening in a lower- course suction passage 6 between a supercharger 2 and the venturi part 8, in a position close to the supercharger 2 side, while starting from this pressure inlet 13 and ending at a pressure outlet 15 which opens in the crank case of an engine body 10. Sucked air with positive pressure flowing into the pressurizing pipe 14 is led into the crank case in the engine body 10 and returns the blow-by gas within the crankcase to the outlet 12b. |
