| 摘要 |
PROBLEM TO BE SOLVED: To provide a blow-by gas reflux device which can be activated both in a supercharging region and in a non-supercharging region (negative pressure region), and can be applied to an NA (natural air intake) engine.SOLUTION: Blow-by gas reflux devices 6 and 7 include: recirculation passages 61 and 71 directly connecting a combustion chamber of a cylinder 1 in an internal combustion engine and a crank chamber 8; and opening and closing valves 62 and 72 provided in the recirculation passages. The opening and closing valves open when pressure in the combustion chamber of the cylinder 1 in an intake stroke of the cylinder becomes negative pressure with respect to pressure in the crank chamber so as to communicate the combustion chamber of the cylinder with the crank chamber. The opening and closing valves close in periods other than that so as to isolate the combustion chamber of the cylinder 1 from the crank chamber. |
