Introduction to DK28 diesel Engine Parts: The structure of the cylinder head

The cylinder head is installed on top of the cylinder block, sealing the cylinder from the top and forming the combustion chamber. It often comes into contact with high-temperature and high-pressure gas, and thus is subjected to significant thermal and mechanical loads. The cylinder head of a water-cooled engine is equipped with a cooling water jacket inside. The cooling water holes on the lower end surface of the cylinder head are connected to those on the cylinder block. Use circulating water to cool high-temperature parts such as the combustion chamber.

The cylinder head is also equipped with intake and exhaust valve seats, valve guide holes for installing intake and exhaust valves, as well as intake channels and exhaust channels, etc. 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 fuel injectors. The cylinder head of the overhead camshaft engine is also machined with camshaft bearing holes for installing the camshaft.

Cylinder heads are generally cast from gray cast iron or alloy cast iron. Aluminum alloy has good thermal conductivity, which is conducive to improving the compression ratio. Therefore, in recent years, aluminum alloy cylinder heads have been adopted more and more.

The cylinder head of a Marine diesel engine is a component of the combustion chamber. The shape of the combustion chamber has a significant impact 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 vary greatly. The combustion chamber of a gasoline engine is mainly located on the cylinder head, while that of a diesel engine is mainly in the depression at the top of the piston.