Cylinder head of an internal combustion engine

摘要

A cylinder head assembly 10 of an internal combustion engine 110 comprises a cylinder head 130, a cylinder head cover 510, a camshaft 135 and a camshaft bearing 500, wherein the camshaft bearing 500 is integrated in the cylinder head cover 510 and the material of the camshaft bearing has the same coefficient of thermal expansion of the material of the camshaft. The camshaft bearing may be casted in during casting of the cylinder head cover, eg by high pressure die casting (HPDC). Alternatively, the camshaft bearing may be pressed in a boss of the cylinder head cover. The camshaft bearing may be a steel or cast iron bushing. The camshaft bearing lubrication oil supply bore 520 may be integrated, eg cast or drilled, in the cylinder head cover.