The cylinder head is generally used cast iron gray cast iron or alloy, since the thermal conductivity of aluminum alloy, and is conducive to improve the compression ratio, the aluminum cylinder head is adopted in recent years more and more.
In the above cylinder head is mounted, and the upper seal cylinder defining the combustion chamber. It is often in contact with high pressure gas, thus subjected to high thermal and mechanical loads. Cooled engine cylinder head cooling water jacket, cooling water hole and a cooling water hole of a cylinder head in communication with the end face. Use of recycled water to cool the high temperature portion of the combustion chamber and the like.
further provided with a cylinder head intake and exhaust valve seat, valve guide holes for mounting intake and exhaust valves, and intake and exhaust passages and the like. Cylinder gasoline engine spark plug mounting hole cover, and the cylinder cover of the diesel engine injector mounting hole. There cylinder head camshaft bearing hole overhead camshaft engine, for mounting of the camshaft.