Patent ID: 6338324
Filing Date: 2002-01-15
Classification: F01L,F01M,F02B,F02F

Abstract:
A lubricating structure for a four-cycle engine comprising:a camshaft having an oil supply path at an axial center thereof and formed with a cam for pressing a tappet adjacent to a cam journal; a journal path bifurcating from the oil supply path and having an opening on an outer peripheral surface of the cam journal so as to supply oil thereto and to a cam bearing that supports the cam journal; at least one intermittent oil supply device configured to intermittently spout oil supplied to the cam bearing and to the cam journal from the oil supply path, through the journal path, and toward the cam and the tappet in line with the rotation of the camshaft; and wherein the intermittent oil supply device is structured so that a cylindrical tappet that is pressed by the cam is disposed adjacent to the cam bearing and the bearing surface of the cam bearing is formed with a wide portion and a narrow portion, and a rotational pathway defined by said journal path opening is positioned within said wide portion and outside said narrow portion so as to open substantially towards said tappet.