| 摘要 |
PROBLEM TO BE SOLVED: To inhibit blow-by gas from blowing in from an oil return passage with a relatively simple structure not requiring separate components when an oil separator of a blow-by gas recirculation system is provided at a back surface side of a cylinder head cover. SOLUTION: In a structure of an oil separator of a blow-by gas circulating system having an oil separating chamber 20 formed by covering a part of a back surface of a cylinder head cover 1 by a cover body 10, and returning oil separated at the oil separating chamber to a cylinder head side, a hollow oil pocket part 30 recessed to the cylinder head side is formed on a cover body, an oil return passage 32 for returning collected oil to the cylinder head side is provided on a side wall 31 of the oil pocket part, and the oil return passage is set in such a manner that an upper end of an inside opening part 33 opening to an inside of the oil pocket part is lower than a lower end of an outside opening part 34 opening to a cylinder head upper space. COPYRIGHT: (C)2009,JPO&INPIT
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