COOLANT PASSAGES IN I.C. ENGINE BLOCK

摘要

A cooling structure for a multi-cylinder piston-engine cylinder block includes a side coolant gallery distributing coolant into a water jacket surrounding a group of cylinders arranged from upstream to downstream. The flow cross-section of the coolant gallery decreases toward its downstream end. The water jacket has a water jacket wall which constitutes part of the coolant gallery. The water jacket wall includes a group of coolant inlets, each of which directs coolant towards the upper part of each of the cylinders. At least one coolant inlet is offset from the center of the corresponding cylinder toward a clearance between adjoining cylinders. This cooling structure can cool all of the cylinders uniformly and the entire surface of each cylinder evenly.