Patent ID: 7059291

Claim:
An internal combustion engine, comprising: 1) a cylinder head including; a bearing holder; and 2) an integrated cam bracket held to an upper portion of the cylinder head, in such a manner that a first cam shaft and a second cam shaft extending substantially in parallel with each other in a direction of a line of a cylinder are sandwiched between the cylinder head and the integrated cam bracket, the integrated cam bracket including; i) a pair of a first side frame and a second side frame, ii) a plurality of bearing beams bridging across the first side frame and the second side frame, the first cam shaft and the second cam shaft being rotatably born by the bearing beams in cooperation with the bearing holder of the cylinder head, iii) a center beam disposed between the first side frame and the second side frame and extending substantially in parallel with the first side frame and the second side frame, and iv) a void portion defined substantially collinear with the center beam and being free from the center beam, wherein the cylinder head is formed with a core hole for extracting a core sand, the core hole opening in an upper face of the cylinder head, and the void portion is so formed as to substantially correspond to the core hole.