Damping structure of inline six-cylinder engine

A damping structure of an inline six-cylinder engine provided with six cylinders longitudinally mounted on a vehicle and disposed in series, the damping structure comprising:

• pistons reciprocatably fitted in the six cylinders, respectively;
• a crankshaft disposed below the pistons in a vertical direction of the vehicle, and coupled to the pistons via connecting rods, respectively, the crankshaft being rotatable about an axis;
• a cylinder block having a plurality of crank journal parts, the crank journal parts disposed below the crankshaft in the vertical direction, and configured to rotatably support the crankshaft between adjacent cylinders in the crankshaft;
• a flywheel fixed to a rear end of the crankshaft in a longitudinal direction of the vehicle;
• and a dynamic damper attached to a lower part of the cylinder block by only a single bolt;
• the dynamic damper provided only in at least one location between two adjacent cylinders among second through fourth cylinders, the six cylinders being disposed in an order of a first cylinder, the second cylinder, a third cylinder, the fourth cylinder, a fifth cylinder, and a sixth cylinder from a front side to a rear side in the longitudinal direction of the vehicle, wherein the dynamic damper includes:
• a stationary part attached to a lower part of the crank journal part and extending downwardly from the lower part of the crank journal part;
• a beam part connected to a lower part of the stationary part and extending in the longitudinal direction;
• and two mass parts connected to connecting parts of the beam part, on the front side and the rear side, respectively, in the longitudinal direction, and extending in a lateral direction of the vehicle while being separated from each other in the longitudinal direction, wherein the stationary part, the beam part, and the two mass parts are formed integrally, wherein the dynamic damper is made of cast iron and formed as an H-shape.