Abstract: A dual-crankshaft, opposed-piston, internal combustion engine includes one or more ported cylinders. Each cylinder has exhaust and intake ports, and the cylinders are juxtaposed and oriented with exhaust and intake ports mutually aligned. The crankshafts are rotatably mounted at respective exhaust and intake ends of the cylinders and are coupled by a multi-gear train. A pair of pistons is disposed for opposed sliding movement in the bore of each cylinder. All of the pistons controlling the exhaust ports are coupled by connecting rods to the crankshaft mounted near at the exhaust ends of the cylinders, and all of the pistons controlling the intake ports are coupled by connecting rods to the crankshaft mounted near at the intake ends of the cylinders. The crankshafts are connected by a timing belt operative to change the rotational timing between the crankshafts. The gear train support structure is stiffened to suppress gear train vibration.

Abstract: A dual-crankshaft, opposed-piston, internal combustion engine includes one or more ported cylinders. Each cylinder has exhaust and intake ports, and the cylinders are juxtaposed and oriented with exhaust and intake ports mutually aligned. The crankshafts are rotatably mounted at respective exhaust and intake ends of the cylinders and are coupled by a multi-gear train. A pair of pistons is disposed for opposed sliding movement in the bore of each cylinder. All of the pistons controlling the exhaust ports are coupled by connecting rods to the crankshaft mounted near at the exhaust ends of the cylinders, and all of the pistons controlling the intake ports are coupled by connecting rods to the crankshaft mounted near at the intake ends of the cylinders. The crankshafts are connected by a timing belt operative to change the rotational timing between the crankshafts. The gear train support structure is stiffened to suppress gear train vibration.

Abstract: Apparatus for the absorption of torsional vibrations of an internal combustion engine includes an input shaft between the internal combustion engine and the transmission, and a drive shaft of the transmission, which is operatively associated with said input shaft. Each of the input and drive shafts includes a torsion bar that has a lower torsional spring constant than the rest of the shaft as a whole. The apparatus further includes a rotating mass device on each of the input and drive shafts, and the apparatus is disposed between the internal combustion engine and the transmission.

Abstract: Apparatus for the absorption of torsional vibrations of an internal combustion engine includes an input shaft between the internal combustion engine and the transmission, and a drive shaft of the transmission, which is operatively associated with said input shaft. Each of the input and drive shafts includes a torsion bar that has a lower torsional spring constant than the rest of the shaft as a whole. The apparatus further includes a rotating mass device on each of the input and drive shafts, and the apparatus is disposed between the internal combustion engine and the transmission.