| 摘要 |
A crankcase ventilating system for a V-type, OHC internal combustion engine comprising a substantially hollow engine body structure having a pair of upwardly diverging cylinder banks and an oil pan secured to the body structure from below to define a crankcase, and also having a pressure buffer chamber, defined between the cylinder banks, at least one engine cylinder, defined in each of the cylinder banks, and a cam chamber defined therein at top of each of the cylinder banks, and an intake system for the introduction of a controlled combustible air-fuel mixture into the engine cylinders. The system comprises first separate oil return passages each defined in the body structure and communicating between the respective engine cylinder and the buffer chamber, and a connecting passage communicating between the buffer chamber and the crankcase. The connecting passage comprises a blow-by gas passage portion, having one end in communication with the crankcase and the other end projecting a distance into and in communication with the buffer chamber, and a second oil return passage portion having one end in communication with the crankcase and the other end opening at the bottom of and in communication with the buffer chamber. |
