| 摘要 |
A cylinder block (3) for a multi-cylinder engine (1) is provided with a water jacket (w) partly on an intake side of a row of cylinders (s1 - s4) and partly on an exhaust side of the row of cylinders (s1 - s4) and a water guide passage (71) through which cooling water is introduced into the water jacket (w). The cylinder block is provided with oil return passages each of which extends straight from top to bottom of the cylinder block (3) between each adjacent cylinders. A branch oil return passage (90) branches off from a middle portion of the rearmost oil return passage (86, 87) and extends rearward up. A generally triangular director pillar (73) having a bolt hole (37), that is defined by first to third side walls (73a, 73b, 73c), is disposed with the first side wall (73a) adjacent to a foremost cylinder (s1) placed approximately perpendicularly to a line (L) passing center axes of the foremost cylinder (s1) and the bolt hole (37), an edge line (73d) facing the first wall (73a) placed in an interface between the water jacket (w) and the water guide passage (71) and the second and third side walls (73b, 73c) placed so as to direct a cooling water stream partly to the water jacket on the intake side and partly to the water jacket on the exhaust side, respectively. <IMAGE> |
