Lubricating structure for a four-stroke engine

Abstract

An intermittent oil supply system is provided that discharges intermittently some of the oil supplied to the cam bearing 53 from the oil supply path 71 formed on the axial center of the camshaft 4 and via the journal path 73 toward the side of the cam 68 and the tappet 48 in line with the rotation of the camshaft 4. The intermittent oil supply system is structured so that an oil groove 77 along the axial direction of the camshaft 4 is formed, for example, on the bearing surface 59a of said cam bearing 53, and at least one end of this oil groove 77 opens on the end face 59b of the cam bearing 53 (bearing housing 59).

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