CYLINDER BLOCK OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To reduce the weight by reducing the number of components of an entire cylinder block and simplifying a structure.SOLUTION: A cylinder block part 3 having a plurality of cylinders 2 and a cylinder head part 5 forming a combustion chamber 4 are integrally casted in a cylinder block 1. A semicircularly recessed crankshaft bearing part 21 is respectively formed in a center of a lower surface of a bulk head 20 on a lower side than the cylinder 2. A bore diameter and a bore pitch are set so that the bulk head 20 and the crankshaft bearing part 21 do not interfere with a bore 2a of the cylinder 2, and a piston is inserted from a crank case side.