Patent ID: 7156060

Claim:
A cam drive gear for an engine, comprising an idle gear rotatably borne on an idle shaft supported on an engine main body so as to permit power to be transmitted from a crankshaft, drive sprockets rotatable together with said idle gear, driven sprockets provided on camshafts, and endless form power transmission members wrapped around said drive sprockets and said driven sprockets; a primary drive gear mounted on the crankshaft for transmitting the power of the engine to a transmission, and an idler drive gear having a diameter smaller than a diameter of said primary drive gear and disposed to an outer side of said primary drive gear in the axial direction, said idle gear is meshed with said idler drive gear and said idle shaft has an axis parallel to said crankshaft, and said drive sprockets have at least parts of outer peripheries thereof opposed to said primary drive gear and said drive sprockets are disposed to an inner side of said idle gear in the axial direction and said drive sprockets are coaxial with and adjacent to said idle gear.