Internal combustion engine.

摘要

An internal combustion engine having a cylinder block, comprises a bearing support beam structure (40) secured to the cylinder block and including a plurality of main bearing carrying sections (42) which are made of aluminum allow and incorporate with the corresponding sections of the cylinder block to rotatably support a crankshaft, and a steel pipe (54) securely disposed within and in a manner to pierce the main bearing carrying sections, thereby lightening the weight of the entire engine, increasing the flexural rigidity of the cylinder block.