Cylinder block of internal combustion engine.

摘要

A cylinder block (20) of internal combustion engine comprises bearing sections (42A, 42B) for supporting a rotatable shaft disposed within a crankcase inner chamber (36), the bearing sections being spaced from each other and from main bearing sections (40) for supporting a crankshaft (34).

The cylinder block includes generally cylindrical hollow beam members (44A, 44B, 44C) each of which is interposed between the two opposite bearing sections in a manner to cover the rotatable shaft supported by the bearing sections (42A, 42B), the hollow beam members being aligned in the direction of the row of cylinder barrels (22).

The invention provides increasing the total rigidity of the cylinder block (20) while achieving engine weight-lightening and lowering the noise level.