Type of cylinder head gasket:
Metal asbestos cushion with asbestos as the matrix, outsource copper or steel. Some use braided steel wire or rolled steel plate as the framework, and some add metal rings around the cylinder hole to improve the strength. Advantage is lower price, but the strength is poor. The use of asbestos has been discontinued in developed countries because of its carcinogenic effects on humans.
The metal pad is made of a single piece of smooth steel plate, and there is elastic relief at the sealing place. It is sealed by the elastic and heat-resistant sealant of the relief. It has been widely used abroad. Advantages are high strength, good sealing effect, but the cost is higher.
The cylinder head is mounted on top of the cylinder block, sealing the cylinder from the top and forming the combustion chamber. It is often in contact with high temperature and high pressure gas, so it bears great thermal load and mechanical load. A cooling water jacket is arranged inside the cylinder head of a water-cooled engine, and the cooling water hole on the lower end of the cylinder head is communicated with the cooling water hole of the cylinder body. The circulating water is used to cool the high temperature parts such as the combustion chamber. The cylinder head is also equipped with an intake and exhaust seat, a valve guide hole for installing an intake and exhaust door, and an intake and exhaust channel, etc. The cylinder head of the gasoline engine is processed with holes for installing spark plugs, while the cylinder head of the diesel engine is processed with holes for installing fuel injectors. The cylinder head of an overhead camshaft engine is also machined with camshaft bearing holes for mounting the camshaft. Cylinder head is generally made of gray cast iron or alloy cast iron. The thermal conductivity of aluminum alloy is good, which is conducive to improving the compression ratio. So in recent years, aluminum alloy cylinder head is used more and more. The cylinder head is an integral part of the combustion chamber. The shape of the combustion chamber has a great influence on the work of the engine. Because of the different combustion modes of gasoline engines and diesel engines, the composition of the combustion chamber on the cylinder head differs greatly. The combustion chamber of a gasoline engine is mainly in the cylinder head, while the combustion chamber of a diesel engine is mainly in the pit at the top of the piston.
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