Patent ID: 7104261

Claim:
An internal combustion engine blowby gas crankcase emission control system, comprising: a breather on a case side for separating an oil component included in a blowby gas in a crankcase; a breather on a cylinder head side for separating an oil component included in a blowby gas on the cylinder head side; a breather tube on the case side one end of which is connected to the breather on the case side; a breather tube on the cylinder head side one end of which is connected to the breather on the cylinder head side; a collecting part to which the breather tube on the case side and the other end of the breather tube on the cylinder head side are connected; and a breather tube on an air cleaner side one end of which is connected to the collecting part and the other end of which is connected to the air cleaner, wherein: the collecting part is provided over a connection of the breather tube on the case side and the breather on the case side, below a connection of the breather tube on the cylinder head side and the breather on the cylinder head side and below a connection of the breather tube on the air cleaner side and the air cleaner, wherein the inside diameter of the breather tube on the air cleaner side is larger than each inside diameter of the breather tube on the case side and the breather tube on the cylinder head side.