CYLINDER HEAD STRUCTURE

Abstract

Provided is a cylinder head structure that, in serving to improve engine output by strengthening the sealing force between a cylinder block and a cylinder head, enables increasing rigidity in places corresponding to the cylinder-bore intervals, to uncomplicatedly improve the sealing force in the inter-bore corresponding areas located along the upper side between adjacent cylinders. In this cylinder head structure, provided are: right and left insertion walls 24, 24 which are disposed between adjacent cylinders and through which clamp bolts are passed; a head upper wall 25 which joins the upper end portions of the pair of insertion walls 24, 24; and a cylinder head bottom wall 26. A head cooling-water channel 2W is formed by being surrounded by these four walls (insertion walls 24, 24, head upper wall 25, and cylinder head bottom wall 26). Between the pair of insertion walls 24, 24, formed is a vertical wall 27 that, extending left to right and spanning between the head upper wall 25 and the cylinder head bottom wall 26, interrupts the head cooling-water channel 2W. The vertical wall 27 is present in a mid-region between the pair of insertion walls 24, 24.

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