Importance

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Abstract

An engine of a motorcycle is provided with a lubricating apparatus and a crank case within which is mounted a crank shaft having one end extending outwardly from a side wall of the crank case, and a cam sprocket drive gear is mounted upon the crank shaft. A cam chain chamber within which a chain is disposed in a loop is formed upon one side of a cylinder block including a cylinder and a piston and a cylinder head disposed above the cam sprocket drive gear. An oil passage hole is formed within a mating face of the crank case to be mated with the side cover, and an oil passage tube is inserted into the oil passage hole. The oil passage tube has a front end provided with at least one oil jetting hole and extends through an inner space defined by means of the looped cam chain and extends further so as to penetrate the side wall of the crank case so that the oil jetting hole is directed toward a lower surface of the piston when the latter is disposed at a lower dead position from the lower side of the piston so as to jet oil guided through an oil passage formed within mating faces defined between the crank case and the side cover towards the lower surface of the piston. The rear portion of the oil passage tube is provided with an engaging piece so as to firmly secure the tube to the crank case.

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First Claim