Cam drive system for engine

摘要

This invention is adapted to improve a cam drive system for an overhead camshaft internal combustion engine having a cylinder block defining at least one cylinder bore. A cylinder head assembly is affixed to the cylinder block and closes one end of the cylinder bore to form a combustion chamber therein. The cylinder head assembly comprises a main valve associate with the combustion chamber. The crankshaft is rotatably journalled relative to the cylinder block at the end of the cylinder bore opposite the cylinder head and driven by the piston. The cylinder head assembly includes at least one detachable member to provide at least in part a journal for journalling an intermediate cam drive shaft for rotation about an axis parallel to the axes of rotation of the crankshaft and the camshaft.