Patent ID: 6921349
Filing Date: 2005-07-26
Classification: F16H

Abstract:
1. A gearbox unit, comprising: a gear input and a gear output; first and second superposition gears which are designed as three-shaft planetary gears, comprising in each case a sun wheel, a ring gear, a bar and planet wheels, wherein the individual shafts are formed in each case by the sun wheels, the ring gears and the bars or the elements which are connected with them secured against torsion—the first superposition gear and the second superposition gear, which are coupled with one another to a four-shaft planetary gear; a first shaft of the first superposition gear and a first shaft of the second superposition gear is connected secured against torsion with the gear input; a second shaft-of the first superposition gear and a second shaft of the second superposition gear is connected secured against torsion with the gear output; an infinitely variable change-speed gear in the form of a traction mechanism gear arranged between third shafts of the first and second superposition gear; means for controlling the speed ratio at the traction mechanism gear; one of the two superposition gears—first superposition gear or second superposition gear—comprising in each case first and second planet wheels meshing in pairs with one another, wherein the first of the planet wheels meshing in pairs with one another meshes in each case directly with the ring gear and the second planet wheel, and in each case the second of the planet wheels meshes with the first planet wheel and the sun wheel, the other one of the two superposition gears having individual planet wheels between the respective sun wheel and ring gear.