CYLINDER BLOCK ASSEMBLY

A cylinder block assembly includes a cylinder block having cylinders and a plurality of crank caps fixed to the cylinder block. The crank caps are arranged such that one of the crank caps is disposedon each of both sides of each of the cylinders in the alignment direction and among the plurality of crank caps arranged in line, each of the center crank cap located at a center position and two sidecrank caps respectively located at both ends has a hole or a groove in such a manner as to be more easily deformable than intermediate crank caps each of which is located between the center crank caps and one of the side crank caps when a load is received from a crankshaft. 气缸体组装体具备：具有气缸的气缸体和固定于所述气缸体的多个曲轴盖。所述曲轴盖在配列方向上在各气缸的两侧各配置一个，排成一列的多个所述曲轴盖中的位于中央的中央曲轴盖及位于两端的两个侧方曲轴盖各自具有孔部或槽，以便在从所述曲轴受到载荷时与位于所述中央曲轴盖与所述侧方曲轴盖之间的中间曲轴盖相比容易变形。