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Supplier Homepage News Technical Article & News Air-Cooled Diesel Engine

Technical Article & News

Air-Cooled Diesel Engine [Jun 03,2011]
Air-Cooled Diesel Engine

        Most modern internal combustion engines are cooled by a closed circuit carrying liquid coolant through channels in the engine block, where the coolant absorbs heat, to a heat exchanger or radiator where the coolant releases heat into the air. Thus, while they are ultimately cooled by air, because of the liquid-coolant circuit they are known as water-cooled. In contrast, heat generated by an air-cooled engine is released directly into the air. Typically this is facilitated with metal fins covering the outside of the cylinders which increase the surface area that air can act on. In all combustion engines, a great percentage of the heat generated (around 44%) escapes through the exhaust, not through either a liquid cooling system nor through the metal fins of an air-cooled engine (12%). About 8% of the heat energy finds its way into the oil, which although primarily meant for lubrication, also plays a role in heat dissipation via a cooler. An air-cooled diesel engine includes a crankcase (1), a cylinder body (3), a cylinder cover, a crank (5), a camshaft (4), an oil feeding system, a distributing system and an electronic speed regulator (12). The cylinder axis is inclined with the cooling ducts (a, b, c, d, e) on both upper and lower sides. The starting motor (10) is set under the cylinder body (3) and on the crankcase (1) flank. The injection pump (11) is set above the camshaft (4) and on the crankcase (1) shell. The electronic speed regulator (12) is set on the crankcase (1) shell deviating from the injection pump (11) to the cylinder body (3). Multiple accessories of the engine can be distributed at the upper and lower sides of the cylinder body (3) as a result of the inclined cylinder body (3) of the engine that has more compact structure and more convenient maintenance. An air deflector (14) combines a connecting plate (13) of the starting motor (10) to enhance the body intensity and rigidity, which is in favor of relieving vibration and reducing noise.