Patent ID: 6058894
Filing Date: 2000-05-09
Classification: F02B,Y10T

Abstract:
A general-purpose air-cooled four-cycle engine comprising:a crankshaft having one end which is used as an output shaft;first and second ball bearings placed respectively on either end of a crankcase for supporting the crankshaft;a camshaft for opening and closing intake and exhaust valves in the engine; anda pair of sliding bearings supporting the camshaft in the crankcase;one of said first and second ball bearings which supports the one end of the crankshaft having a greater external diameter than the other of said first and second ball bearings which supports an opposite end of the crankshaft;the external diameter of the one of said ball bearings being at least equal to a distance between the crankshaft and the camshaft; anda governor driven by rotation of the crankshaft enclosed within the crankcase adjacent said opposite end of the crankshaft.