BLOW-BY GAS REFLUXING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a blow-by gas refluxing device which performs effective ventilation from inside a crankcase throughout the entire operating range.

SOLUTION: This blow-by gas refluxing device 1 for an engine 3 with a supercharger includes a blow-by gas refluxing passage 4 composed of a first blow-by gas refluxing passage 41 and a second blow-by gas refluxing passage 42. The inlet of the first blow-by gas refluxing passage 41 is connected to a cylinder block 31 or a head cover 32 and the outlet thereof is connected to an intake air bypass passage 23 for connecting the upstream side with the downstream side of the supercharger 21 in an intake passage 2 to each other. The first blow-by gas refluxing passage 41 or the intake air bypass passage 23 is provided with a first backflow preventing means 24 for preventing inflow from the first blow-by gas refluxing passage 41. The outlet of the second blow-by gas refluxing passage 42 is connected to the intake air passage 2 on the downstream side of a throttle valve 22, and is provided with a second backflow preventing means 421 preventing inflow from the second blow-by gas refluxing passage 42.

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