Damper assembly for chain or belt drive

A method of fabricating chain or belt drive assembly, comprising:

• fixedly securing at least one connection element to at least one first pendulum mass;
• passing the at least one connection element through at least one opening in a first sprocket, the at least one opening passing through material forming the sprocket and wholly surrounded by the material forming the first sprocket;
• disposing the at least one first pendulum mass on a first radial side of the first sprocket;
• fixedly securing the at least one connection element to at least one second pendulum mass disposed on a second radial side of the first sprocket, opposite the first radial side;
• non-rotatably connecting a camshaft to the first sprocket;
• engaging a continuous chain or belt with a first plurality of radially outwardly extending protrusions on the first sprocket;
• and,
• engaging the continuous chain or belt with a second plurality of radially outwardly extending protrusions on a second sprocket, wherein:
• the at least one connection element is displaceable within the at least one opening in radial and circumferential directions.

An engine timing chain assembly, comprising:

• a first sprocket including:
• a first plurality of radially outwardly extending protrusions;
• and,
• a plurality of pairs of first and second openings, each first and second opening passing through material forming the sprocket and wholly surrounded by the material forming the first sprocket;
• a second sprocket including a second plurality of radially outwardly extending protrusions;
• a continuous chain or belt engaged with the first and second pluralities of protrusions;
• and,
• a plurality of pendulum mass assemblies, each pendulum mass assembly including:
• a respective first pendulum mass disposed on a first radial side of the first sprocket;
• a respective second pendulum mass disposed on a second radial side, opposite the first radial side, of the first sprocket;
• and,
• a respective pair of first and second connection elements fixedly connected to the respective first and second pendulum masses, wherein:
• each first connection element passes through a respective first opening;
• each second connection element passes through a respective second opening;
• said each first connection element is displaceable within the respective first opening in radial and circumferential directions;
• and,
• said each second connection element is displaceable within the respective second opening in the radial and circumferential directions.