An eccentric drive for driving cutter mechanisms on mowing attachments for combine harvesters is provided that comprises a gearbox housing (16), a gearbox chamber (12) enclosed by the gearbox housing (16), a first shaft (20) mounted in the gearbox housing (16), a cavity (88) formed in the first shaft (20) and having its cross-sectional center of gravity eccentric to the axis of rotation (18), in which cavity a second shaft (106) is rotatably mounted, having a toothed region (124), which is engaged with the gearbox housing (16), and a shaft end region (113) protruding axially from the cavity (88) of the first shaft (20), and a third shaft (26) wherein a flywheel body (152) can be connected to the third shaft (26) via a bushing (154) that is tapered on its outer surface (158) and is arranged rotatably fixedly and axially fixably on the third shaft (26).
