PCV VALVE AND BLOW-BY GAS REDUCTION DEVICE

摘要

PROBLEM TO BE SOLVED: To inhibit excessive pressure rise in an engine main body even if circulation of blow-by gas in a blow-by gas flow passage is damaged by foreign matter such as sludge. SOLUTION: PCV valve 40 is provided with a valve case 41 provided with the blow-by gas flow passage 42, and a valve body 60 movably provided in the blow-by gas flow passage 42 and regulating blow-by gas by moving according to pressure difference between inlet side pressure and outlet side pressure of the blow-by gas flow passage 42. The blow-by gas flow passage 42 is provided with an inlet side chamber and an outlet side chamber 45 with having a regulating part 62 on a border. A pressure release passage 64 establishing communication between the inlet side chamber 43 and the outlet side chamber 45 of the blow-by gas flow passage 42 at a moving position of the valve body 60 when inlet side pressure of the blow-by flow passage 42 is higher than outlet side pressure and pressure difference between inlet side pressure and outlet side pressure gets to predetermined value or higher is formed on the valve body 60. COPYRIGHT: (C)2008,JPO&INPIT