Patent ID: 6837208
Filing Date: 2005-01-04
Classification: F01M,F02B,F02F

Abstract:
1. A cylinder block for an internal combustion engine, comprising: a cylinder block side wall including a boss section located corresponding to a position between adjacent cylinders, a cylinder head being fastened to the side wall at the boss section by a bolt, and a section defining therein an oil dropping passage through which lubricating oil to be returned from the cylinder head to a crank case is introduced, wherein the oil dropping passage is located adjacent the boss section and includes an upper passage portion whose upper end is opened to an upper deck of the cylinder block, a lower passage portion whose lower end is opened to a lower section of the cylinder block, and an intermediate passage portion through which the upper and lower passage portions are in communication with each other, the oil dropping passage defining section including an outer wall surrounding the intermediate passage portion of the oil dropping passage, the outer wall having a side section located at one side in an engine cylinder row direction, the side section linearly integrally connecting the lower end of the boss section and the lower decks, wherein the upper and intermediate passage portions of the oil dropping passage are offset relative to each other in the engine cylinder row direction, a first step portion being formed at a joint portion between the upper and intermediate passage portions.