Polygon Compensation Coupling for Chain Drive Vibration Reduction

The patent changes the geometric parameters of the coupling elements, specifically using an eccentric configuration where the hinge point of the linkage does not coincide with the center of rotation of the rotatable elements. This eccentric parameter allows the coupling system to compensate for the polygon effect without requiring increased numbers of chain links or sprocket teeth, thereby reducing system complexity while maintaining the beneficial effects of reduced vibration and noise.

The patent introduces asymmetry into the coupling system through the eccentric hinge point configuration. The linkage connects the first and second rotatable elements at a hinge point that is offset from the center, creating an asymmetric mechanical advantage that compensates for the polygon effect. This asymmetric design allows for effective vibration reduction without requiring increased sprocket diameter, thus maintaining compact system dimensions.

The patent introduces a mechanical intermediary system - the polygon compensation coupling - that mediates between the constant velocity motor output and the chain drive. This mechanical intermediary uses the eccentric linkage mechanism to automatically generate the required non-constant velocity profile without requiring electronic control or repeated acceleration/deceleration cycles, thereby eliminating the additional energy consumption associated with electronic velocity control systems.

The patent replaces the curved track section mechanical solution with a coupling mechanism that achieves polygon effect compensation through rotational motion transformation. Instead of modifying the chain path geometry with curved sections that reduce usable length, the invention uses an eccentric rotational coupling that transforms constant angular velocity into non-constant angular velocity, achieving the same compensatory effect without sacrificing chain loop length or requiring additional track complexity.