Patent ID: 6530356
Filing Date: 2003-03-11
Classification: F01M,F02B,F02F

Abstract:
A structure for an engine block of a reciprocating engine having a cylinder block which is provided with a straight row of cylinders in which pistons are received, respectively, for reciprocating movement, a mount located at a rear end wall of said cylinder block in a lengthwise direction of said engine to which a transmission is mounted, said structure for an engine block comprising:oil supply means for supplying an engine oil to sliding parts that are installed to said engine block from an oil source means; and oil return means for returning an engine oil to the oil source from the sliding parts, said oil return means comprising: a plurality of oil return passages formed along said straight row of cylinders in each of opposite side walls of said cylinder block, each said oil return passage extending straight from top to bottom of said cylinder block between adjacent cylinders and having opposite ends opening in top and bottom surfaces of said cylinder block, respectively; and a branch oil return passage branching off from one of said oil return passages that is closest to said rear end wall of said cylinder block, said branch oil return passage extending upwardly obliquely towards said rear end wall of said cylinder block and having an end opening in said top surface of said cylinder block, wherein said end opening of said branch oil return passage is located closer to said rear end wall of said cylinder block than said end opening of said one oil return passage opening in said top surface of said cylinder block.