Individual cylinder head

A liquid-cooled cylinder head assembled of several parts for piston internal combustion engines having two inlet and outlet valves respectively arranged adjacent one another, the liquid-cooled cylinder head comprises a cast upper part and a double-walled bottom means between said upper part and a combustion space, said double-walled bottom means being provided with aperture means for valves and for one of an injection nozzle and a pre-chamber, and cooling liquid space means being formed in said double-walled bottom means, characterized in that the double-walled bottom means extends substantially over an entire lower surface of the cylinder head upper part essentially up to an outer boundary thereof, in that a lower surface of the upper part and upper and lower surfaces of the doubled-walled bottom means are constructed substantially planar, in that upper and lower wall portions of the double-walled bottom means are supported with respect to one another by support means within an annular zone in an area of the support of the double-walled bottom means on a cylinder head seal, and in that several cooling medium inlet openings are distributed in the lower wall portion of the double-walled bottom means between the annular zone and an outer boundary of the double-walled bottom means.