Lubricating system of internal combustion engine

摘要

A crankcase is provided with a ceiling portion for shutting off the upper side of an oil pool chamber. An oil flowing window is opened in the ceiling portion of a right case. An oil strainer is formed in a flat plate like shape The oil strainer is fitted to the oil flowing window The right case is provided with an oil passage through which the oil having passed through the oil strainer flows roughly horizontally to an oil pump suction port. The ceiling portion of the right case is provided with a cutout portion by not casting a portion of the case at a position where the ceiling portion of the right case and an oil pump are adjacent to each other, and a plug is fitted in the cutout portion. The vertical size from the oil pool to the oil pump suction port can be reduced as much as possible, and the overall height of the internal combustion engine can be restricted.