Patent ID: 8430775
Filing Date: 2013-04-30
Classification: F01L,F16H

Abstract:
1. A chain and sprocket system for use with a load outside the chain and sprocket system, having at least one tension source outside the chain and sprocket system, the system having a lower torsional resonance mode and a higher torsional resonance mode, the system comprising: at least one drive sprocket, at least two tension reducing sprockets, each having a repeating pattern of pitch radii repeating a number of times equal to a sprocket order at which an overall maximum tension from the tension sources at a resonance in the chain and sprocket system occurs, and a chain coupled to the at least one drive sprocket and the at least two tension reducing sprockets at a wrap angle, wherein one of the two tension reducing sprockets is coupled to the load on the tension reducing sprocket at an orientation with a maximum pitch radii of the repeating pattern at a center of the chain wrap angle and the other of the two tension reducing sprockets is coupled to the load on the tension reducing sprocket at a minimum pitch radii of the repeating pattern at the center of the chain wrap angle, such that tensions from the at least one tension source outside the chain and sprocket system are reduced at the higher torsional resonance mode and tensions at the lower torsional resonance mode are increased no more than 20%, such that when the at least two tension reducing sprockets are coupled to the load outside the chain system, overall maximum tension from the tension sources are reduced at the resonance in the chain and sprocket system.