| 摘要 |
PROBLEM TO BE SOLVED: To provide a crankcase bleeding passage that can suppress oil components mixing into blowby gas without increasing the number of parts, complicating and enlarging an engine structure. SOLUTION: A crank case bleeding passage is installed on an engine equipped with a sprocket at least a part of which is dipped in oil in an oil pan 3. The crankcase bleeding passage is provided with a blowby gas chamber 25 to separate oil in blowby gas and holes 37 prepared in the end wall of crankshaft direction of a cylinder block 2 connecting to a blowby gas chamber from inside of the crankcase. The holes 37 are opened at shielded positions by a tensioner of a chain wound on the sprocket or a support base 23a of a guide 23. Thereby, oil can be prevented from entering into the blowby gas chamber for separating oil component without requiring special members.
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