Crankshaft and journal arrangement for engine

摘要

A compact power unit for an internal combustion engine including a bearing arrangement for the crankshaft which includes a combined crankcase member and bearing cap that has integral bearing journals for the crankcase and which also forms at least in part the crankcase closure. An output shaft for powering a vehicle is also journaled by the cylinder block and crankcase member and is driven by an integral gear formed on one of the throws of the crankshaft. A balancing arrangement for accommodating this non balanced throw and for maintaining equal cylinder bore spacing is also employed.