Patent ID: 9670804
Date: 2017-06-06
CPC Classifications: F01M

Claim:
1. An oil passage of an internal combustion engine, the internal combustion engine, comprising: a crankcase; a crankshaft extending through the crankcase, the crankshaft having an axis of rotation; a cylinder block integrally connected to the crankcase; a piston operatively mounted within the cylinder block; a piston jet operatively provided relative to the cylinder block for supplying oil in the internal combustion engine to the piston; a breather device on the cylinder block wherein the breather device is in communication with an inside of the crankcase; a recessed portion is formed in an outer surface of a ceiling wall of the breather device with an oil supply path being integrally formed on a lower side of the recessed portion, said recessed portion forming a water drain groove extending from a high point on a first side of the cylinder block, the high point having a first vertical distance from the rotational axis of the crankshaft to a low point on a second side of the cylinder block, the low point having a second vertical distance from the rotational axis of the crankshaft for draining water, the first vertical distance being greater than the second vertical distance; and wherein said oil supply path for supplying oil to the piston jet is integrally formed in the ceiling wall of the breather device wherein said ceiling wall radiates heat by being exposed to ambient air.