GB695737A - Improvements in cooling systems for internal combustion engines - Google Patents

Abstract

695,737. Cooling engines. GENERAL MOTORS CORPORATION. April 4, 1951 [April 22, 1950], No. 7766/51. Class 7 (ii). In an engine cooling system, e.g. for a compression-ignition two-stroke engine, a cooling liquid cavity and a number of cooling liquid passages are disposed on opposite sides of the engine cylinders and so arranged and interconnected that the hotter parts of the engine are cooled by forced circulation of the liquid and the cooler parts of the engine are cooled by convection circulation of the liquid within the cavity. As shown, a four cylinder in-line engine is provided on one side of the cylinders 11, 12, 13, 14 with cavities 131, 132, 133 separated from each other by walls 134, 136, and on the other side of the cylinders with chambers 113, 119 connected by passages 114, 116, 117, 118 between cylinder exhaust passages 107, 108, 109, 111. The chamber 119 is divided into two sections 128, 129. Cavity 132 is connected to the chamber 113 by passages 123, 137, and cavities 131, 133 communicate with the sections 128 and 129 by passages 121, 141, 122, 142 and 124, 138, 126, 139. Cooling liquid forced by a pump 37 through an oil-cooler chamber 53, and openings 54, 56 into the cavity 132 flows with a high velocity across the cavity into the passage 137 and through the passage 123 into the central portion of the chamber 113 from which portion the liquid then flows to both ends of the cylinder block 28, through the passages 114, 116 and 117, 118 into the sections 128, 129 and then through the passages 141, 142 and 138, 139 into the cavities 131, 133. Outlet passages, 143, 144 directly above the passages 137, 138, 139, 141, 142 allow the liquid to flow from the chamber 119 into the cylinder head 97 and then to a radiator. There are relatively stagnant bodies of liquid in the lower portions of the cavities bounded by the upper end of a wall 78 so that the lower parts of the cylinders are cooled by convection circulation of the liquid. Lubricating oil supplied through a fitting on the cover of the head 97 flows from the cover through tubular passages 81,... 84, housing valve push-rods, to the crankcase. The wall 78 together with walls 102, 103 form a charging and scavenging fluid manifold 104.