Patent ID: 7862460

Claim:
A damped sprocket assembly for a chain driven power transmission system comprising a) a sprocket body pivotally secured to a support housing, the sprocket body having a central hub portion having an axial bore and a continuous row of spaced apart radially projecting teeth on an annular circumference of the sprocket body; b) a proximal annular flange positioned between the spaced apart radially projecting teeth and the support housing and a distal annular flange located on the other side of the continuous row of spaced apart radially projecting teeth; c) a proximal groove having a diameter located between the proximal annular flange and the continuous row of spaced apart radially projecting teeth; d) a distal groove having a diameter located between the distal annular flange and the continuous row of spaced apart radially projecting teeth; e) a proximal ring having an inner diameter loosely positioned within the proximal groove, the inner diameter of the proximal ring being larger than the diameter of the proximal groove defining a proximal cavity; f) a distal ring having an inner diameter loosely positioned within the distal groove, the inner diameter of the distal ring being greater than the diameter of the distal groove defining a distal cavity; g) at least one annular fluid channel located between the hub and the continuous row of spaced apart radially projecting teeth; h) a distal feed channel for transmitting fluid to the distal groove and a proximal feed channel for transmitting fluid to the proximal groove, the distal and proximal feed channels being in functional communication with the at least one annular fluid channel to provide a passage for the flow of fluid; and i) a channel located within the hub for transmitting fluid from the axial bore to the at least one annular fluid channel.