| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To properly reduce oil mist contained in blow-by gas and properly prevent sludge from being accumulated in a recirculation passage. <P>SOLUTION: A recirculation passage 30 includes a first conduit pipe 31 having one end opened in a crank case 7, an oil tank 32 connected to the other end of the first conduit pipe 31, second third conduit pipes 34, 36 for connecting the oil tank 32 with an intake passage 20. An opening 31a of the first conduit pipe 31 is located vertically below a stop oil-surface Lstop which is an oil surface in the crank case 7 at an engine stop. The recirculation passage 30 is configured to suck oil in the crank case 7 into the oil tank 32 through the first conduit pipe 31 by negative pressure generated in a surge tank 23, and to expose the opening 31a at the one end of the first conduit pipe 31 on the oil surface as the oil surface in the crank case 7 decreases. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
