Structural Function Of Cylinder Head

1. Working conditions and requirements for cylinder head
The cylinder head is subjected to mechanical loads caused by gas forces and tightening of cylinder head bolts, as well as high thermal loads due to contact with high-temperature gas. To ensure good sealing of the cylinder, the cylinder head must not be damaged or deformed. The cylinder head should have sufficient strength and stiffness for this purpose. In order to make the temperature distribution of the cylinder head as uniform as possible and avoid thermal cracks between the intake and exhaust valve seats, good cooling should be carried out on the cylinder head.
2. Cylinder head material
Cylinder heads are generally made of high-quality gray cast iron or alloy cast iron, while gasoline engines used in cars often use aluminum alloy cylinder heads.
3. Cylinder head construction
The cylinder head is a complex box shaped component. It is machined with intake and exhaust valve seat holes, valve guide holes, spark plug installation holes (for gasoline engines) or injector installation holes (for diesel engines). There is also a water jacket, intake and exhaust duct, and a combustion chamber or a part of the combustion chamber cast inside the cylinder head. If the camshaft is installed on the cylinder head, there are also cam bearing holes or cam bearing seats and their lubricating oil channels machined on the cylinder head.