Abstract: An alternator damper pulley for a vehicle includes a pulley body connected to an engine to receive a rotational power from an engine. A shaft connection portion is provided within the pulley body such that a rotational shaft of an alternator is insertedly coupled therein. A torsion spring is installed on an outer circumferential surface of the shaft connection portion to reduce a variation of the rotational power transmitted from the pulley body. A clutch is interposed between the torsion spring and the pulley body to connect or disconnect the shaft connection portion and the pulley body. A friction damper is installed to apply frictional damping force to the shaft connection portion.

Abstract: A method for protecting a dual mass flywheel (DMF) of a vehicle includes comparing, by a controller, an RPM of a vehicle engine with a threshold value, which is set to avoid a resonance point of the DMF. If the RPM of the engine is less than the threshold value, fuel injection into the engine is shut off to stop the engine by the controller. Whether a fuel injection condition to start the engine is met is determined after the fuel injection is shut off by the controller. If the fuel injection condition is met, the fuel injection into the engine is resumed to start the engine by the controller.

Abstract: An alternator damper pulley for a vehicle includes a pulley body connected to an engine to receive a rotational power from an engine. A shaft connection portion is provided within the pulley body such that a rotational shaft of an alternator is insertedly coupled therein. A torsion spring is installed on an outer circumferential surface of the shaft connection portion to reduce a variation of the rotational power transmitted from the pulley body. A clutch is interposed between the torsion spring and the pulley body to connect or disconnect the shaft connection portion and the pulley body. A friction damper is installed to apply frictional damping force to the shaft connection portion.

Abstract: A structure of an engine includes: a crankshaft module configured to convert reciprocal motion of a piston into rotational motion; and a first balance shaft module and a second balance shaft module configured to reduce vibration of the engine, in which the first balance shaft module is directly gear-meshed with the crankshaft module, and the second balance shaft module is gear-meshed with the crankshaft module through an intermediate gear.

Abstract: A structure of an engine includes: a crankshaft module configured to convert reciprocal motion of a piston into rotational motion; and a first balance shaft module and a second balance shaft module configured to reduce vibration of the engine, in which the first balance shaft module is directly gear-meshed with the crankshaft module, and the second balance shaft module is gear-meshed with the crankshaft module through an intermediate gear.

Abstract: A piston apparatus for an engine includes a piston pin that is inserted in a smaller end portion of a connecting rod and having a cross-section changing portion where a cross section changes at a portion of the piston pin, and a fixing member that engages the connecting rod and a piston through the cross-section changing portion so as to restrain longitudinal movement of the piston pin with respect to the connecting rod.

Abstract: A piston apparatus for an engine, may include a piston pin inserted in a smaller end portion of a connecting rod and having a cross-section changing portion where a cross section changes at a portion of the piston pin, and a fixing member engaging the connecting rod and a piston through the cross-section changing portion to restrain longitudinal movement of the piston pin with respect to the connecting rod.

Abstract: A balancing assembly of an engine may include a crankshaft in which crank pins each connected to a connecting rod, are disposed at both ends thereof, and that is equipped with a counterweight opposite to and corresponding to each crank pin, a balance shaft that is disposed at a distance from the crankshaft and that rotates by the crankshaft, and a balance weight that is eccentrically formed with a balance shaft and that absorbs vibration.

Abstract: A crankshaft set of a two-cylinder engine that is equipped with a flywheel may include a crankshaft that is mounted on an engine block, a first crank pin that is formed at one end of the crankshaft and is connected to a first piston through a connecting rod, a second crank pin that is formed at the other end of the crankshaft and is connected to a second crank pin through a connecting rod, and a flywheel that is disposed between the first and second crank pins and is integrally formed with the crankshaft. Accordingly, the twist and vibration characteristics are improved because the flywheel is disposed between the adjacent crank pins.

Abstract: A balancing assembly of an engine may include a crankshaft in which crank pins each connected to a connecting rod, are disposed at both ends thereof and that is equipped with a counterweight opposite to and corresponding to each crank pin, a balance shaft that is disposed at a distance from the crankshaft and that rotates by the crankshaft, and a balance weight that is eccentrically formed with a balance shaft and that absorbs vibration.