Patent ID: 6634330
Filing Date: 2003-10-21
Classification: F01L,F02B,Y10T

Abstract:
An engine, comprising:a cylinder block having a crankcase formed integrally therewith and a cylinder bore formed therein; a cylinder head connected to said cylinder block; a crankshaft rotatably supported by said crankcase; a piston, said piston being slidably fitted in said cylinder bore and being operatively connected to said crankshaft; a camshaft having an axial line parallel to an axial line of said crankshaft, said camshaft being interlocked with said crankshaft at a reduction ratio of 1/2, said camshaft being disposed on one side of said crankshaft and being rotatably supported by said crankcase; a rocker shaft fixedly supported by said cylinder head; a rocker arm supported by said rocker shaft for rocking motion thereon in accordance with rotation of said camshaft, said rocker arm being operatively connected to engine valves; said rocker shaft is arranged to have an axial line thereof crossing an axial line of said crankshaft on a projection plane perpendicular to an axial line of said cylinder bore; and an input arm extending on said projection plane from said rocker arm to said one side of said crankshaft is provided on said rocker arm rockably supported by said rocker shaft; and a rod reciprocating in an axial direction in accordance with the rotation of said camshaft is connected to said input arm to rock said rocker arm in a valve opening direction.