Cylinder head construction
The cylinder head is a box-shaped part with complex structure. It has machining inlet and exhaust valve seat holes, valve guide holes, spark plug mounting holes (gasoline engine) or injector mounting holes. A water jacket, an intake and exhaust passage, and a portion of the combustion chamber or combustion chamber are also cast in the cylinder head. If the camshaft is mounted on the cylinder head, the cylinder head is also machined with a cam bearing bore or cam bearing housing and its lubricating oil passage.
The cylinder heads of water-cooled engines are available in one-piece, one-piece and one-piece configurations. In a multi-cylinder engine, if all cylinders share a cylinder head, the cylinder head is said to be an integral cylinder head; if every two cylinders have one cover or three cylinders and one cover, the cylinder head is a block type cylinder head; When the cylinder is covered, it is a single cylinder head. Air-cooled engines are all unitary cylinder heads.