Four cylinder head mould

The cylinder head is generally called the cylinder head, which is a part of the engine and the engine cylinder head.

The cylinder head is mounted on the upper surface of the cylinder block, and the cylinder is sealed from the upper portion to constitute a combustion chamber. It is often in contact with high temperature and high pressure gas and is therefore subject to large thermal and mechanical loads. The cylinder head of the water-cooled engine is internally provided with a cooling water jacket, and the cooling water hole at the lower end surface of the cylinder head communicates with the cooling water hole of the cylinder block. The circulating water is used to cool a high temperature portion such as a combustion chamber.

The cylinder head is also equipped with inlet and exhaust valve seats, valve guide holes for installing inlet and exhaust valves, as well as intake and exhaust passages. The cylinder head of the gasoline engine is machined with a hole for installing a spark plug, and the cylinder head of the diesel engine is machined with a hole for installing the injector. A camshaft bearing bore is also formed in the cylinder head of the overhead camshaft engine for mounting the camshaft.

The cylinder head is generally cast from gray cast iron or alloy cast iron. The aluminum alloy has good thermal conductivity and is beneficial to increase the compression ratio. Therefore, the aluminum alloy cylinder head has been used more and more in recent years.

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. Because of the different combustion modes of the gasoline engine and the diesel engine, the parts of the cylinder head that make up the combustion chamber are quite different. The combustion chamber of the gasoline engine is mainly on the cylinder head, and the combustion chamber of the diesel engine is mainly in the pit at the top of the piston.