Post: Cylinder head

The cylinder head is installed on the top of the cylinder block, sealing the cylinder from the top and forming a combustion chamber. It is often in contact with high-temperature and high-pressure combustion gas, so it bears a large thermal and mechanical load. The cylinder head of a water-cooled engine is made with a cooling water jacket inside, and the cooling water hole on the lower end of the cylinder head is connected to the cooling water hole of the cylinder block. Circulating water is used to cool the high-temperature parts such as the combustion chamber.
Cylinder head
The cylinder head is also equipped with intake and exhaust valve seats, valve guide holes for installing intake and exhaust valves, and intake and exhaust channels. The cylinder head of a gasoline engine is machined with holes for installing spark plugs, while the cylinder head of a diesel engine is machined with holes for installing injectors. The cylinder head of an overhead camshaft engine is also machined with camshaft bearing holes for installing the camshaft.
The cylinder head is generally cast with gray cast iron or alloy cast iron. Aluminum alloy has good thermal conductivity, which is conducive to improving the compression ratio, so aluminum alloy cylinder heads are increasingly used.
The cylinder head is a component of the combustion chamber. The shape of the combustion chamber has a great influence on the operation of the engine. Due to the different combustion methods of gasoline engines and diesel engines, the parts of the cylinder head that make up the combustion chamber are quite different. The combustion chamber of a gasoline engine is mainly on the cylinder head, while the combustion chamber of a diesel engine is mainly in the pit on the top of the piston. Here we only introduce the combustion chamber of a gasoline engine, and the combustion chamber of a diesel engine is introduced in the diesel supply system.