| 摘要 |
PURPOSE:To improve the rigidity in the direction of crankshaft of a cylinder head by forming a cylindrical part which surrounds a spark plug from the upper deck surface of a cylinder head and connecting the cylindrical parts of the contiguous cylinders by ribs. CONSTITUTION:In a DOHC multicylinder engine, a cylindrical part 7 continuous to a spark-plug installation part 6 is installed in projection upwardly onto the upper deck 2 of a cylinder head 1, and a spark plug 5 is surrounded by the cylindrical part 7. A connecting rib 12 extending towards a crankshaft is installed in projection onto the upper-part peripheral surface of the cylindrical part 7, and the cylindrical parts 7, 7 of the contiguous cylinders are connected with each other, and the front and back partitioning walls 13 and 14 are connected with the cylindrical part 7. Therefore, the rigidity in the direction of crankshaft of the cylinder head 1 can be improved.
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