Active inertia torque absorbing system

An active inertia absorbing system disposed in an internal combustion engine having a cylinder block rotatably mounting a crankshaft, a cylinder head connected to the cylinder block and subjected to periodic vibrations, and a gear train having a plurality of gears for driving the camshaft from the crankshaft, comprising:

• a camshaft gear releasably mounted to the camshaft and being one of the gears of the gear train, the camshaft gear having an outer periphery;
• a carrier rigidly connected to the camshaft gear for conjoint rotation therewith, the carrier having two opposing sides and a plurality of bores extending through the carrier with each of the bores having a predetermined diameter;
• means for establishing an active inertia operatively associated with the carrier for absorbing the vibration of the camshaft, the establishing means including a plurality of cylindrical weights positioned within the bores with the weights each having a predetermined diameter less than the predetermined diameter of the bores;
• and
• means for holding the weights within the bores, the holding means including a pair of rings connected to the opposing sides of the carrier by a plurality of fasteners so that a crescent shaped space is formed adjacent the outer periphery of the camshaft gear.