Lubricating device for internal combustion engine

摘要

A crank case is divided in the longitudinal direction into a front case and a rear case. The front and rear cases are fastened to each other with bolts. A bolt hole through which the bolt passes has a diameter larger than that of the bolt. The bolt hole forms part of an oil passage. The connection end plane on the front case side has an oil groove extending from the right end side to the left end side of the connection end plane. The oil groove is in communication with a communication port at the right end of the connection end plane, and is in communication with an oil passage formed around a bolt at the left end of the connection end plane. With this construction, it becomes easy to form an oil passage in a crank case which is divided into two parts in the longitudinal direction without the need of provision of any special piping.