| 摘要 |
<P>PROBLEM TO BE SOLVED: To increase blowby gas returning flow rate according to increase of supercharging pressure without increasing intake air resistance when a supercharger operates. Ž<P>SOLUTION: This blowby gas returning device is provided on an engine 1 provided with the supercharger 7 in an intake air passage 3, and is provided with blowby gas returning passages 18, 22 making blowby gas formed from the engine 1 flow to the intake air passage 3 for returning the same to the engine. The device is provided with an intake bypass passage 16 connecting a downstream side and an upstream side of the supercharger 7 in the intake air passage 3, a jet pump 17 for generating negative pressure in an intake air bypass passage 16. An outlet of the first blowby gas returning passage 18 is connected to the intake bypass passage 16 via the jet pump 17. The second blowby gas returning passage 22 connecting a head cover 21 and the intake air passage 3 at a downstream side of the throttle valve 15 is provided and a PCV valve 23 is provided at an inlet of the returning passage 22 at the head cover 21. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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