Patent ID: 6250273
Filing Date: 2001-06-26
Classification: F01L,F02B,F02F

Abstract:
A 4-cycle engine comprising an engine body which is comprised of a crankcase including first and second bearing portions for supporting opposite ends of a crankshaft, and a head-integral type cylinder barrel having a cylinder bore in which a piston is received, whereinsaid crankcase is comprised of first and second case halves which are coupled to each other at a parting plane extending to obliquely intersect an axis of said first and second bearing portions, said cylinder barrel and the first bearing portion being integrally molded on said first case half to form an engine block, said second bearing portion being integrally molded on said second case half, and a side cover is coupled to an outer side surface of said engine block on a side of the engine block opposite from said parting plane, so as to define a valve operating chamber for accommodation and support of a valve operating mechanism between said side cover and said outer side surface.