| 摘要 |
PROBLEM TO BE SOLVED: To provide a blow-by gas treatment device capable of both improving blow-by gas treatment performance and suppressing reliability deterioration of an internal combustion engine.SOLUTION: This device is applied to an internal combustion engine 10 in which a compressor 32 of a supercharger 30 is provided in an intake passage 19, and treats blow-by gas in a crank case 14 by exhausting to the intake passage 19. The blow-by gas treatment device includes a second introduction passage 53 for communicating a part of the intake passage 19 which is on the downstream side from the compressor 32 and the crank case 14. It includes a check valve 55 which cuts off the communication of the intake passage 19 and the crank case 14 by the second introduction passage 53, when an internal pressure of the part of the intake passage 19 which is on the downstream side from the compressor 32 is higher than an internal pressure of the crank case 14, and the difference between those internal pressures is equal to or higher than a predetermined pressure. |
