Patent ID: 8047944
Filing Date: 2011-11-01
Classification: F16H

Abstract:
1. A transmission unit, comprising: a transmission input; a transmission output; a first superposition gear; a second superposition gear, each of said first and second superposition gears formed as a three-shaft planetary gear and including a first shaft, a second shaft, a third shaft, a sun wheel, an internal gear, a bridge, a plurality of planet wheels, said first, second, and third shafts of each of said first and second superposition gears each being formed respectively by a corresponding one of said sun wheel, said internal gear, said bridge, said plurality of planet wheels, and a plurality of elements connected thereto in a rotationally fixed manner, said first shaft of said first superposition gear being at least indirectly connected in a rotationally fixed manner to said transmission input, said second shaft of said first superposition gear and said second shaft of said second superposition gear being at least indirectly connected in a rotationally fixed manner to said transmission output; a continuously variable transmission formed as a flexible drive transmission, said transmission input being connected to, and being capable of being connected to, said continuously variable transmission only by way of said first superposition gear, in all operating ranges said transmission input and said continuously variable transmission having no direct rotationally fixed connection therebetween; a device for controlling a gear ratio at said flexible drive transmission; a first connecting gear; a second connecting gear, said first superposition gear being coupled with said continuously variable transmission via said first connecting gear, said second superposition gear being coupled with said continuously variable transmission via said second connecting gear, said first and second connecting gears each including a gear ratio stage, said third shaft of said first superposition gear being connected to said continuously variable transmission via said first connecting gear, said third shaft of said second superposition gear being connected to said continuously variable transmission via said second connecting gear; a first shiftable clutch; and a second shiftable clutch, said second shaft of said first superposition gear and said third shaft of said second superposition gear being connected to said transmission output via said first shiftable clutch, said second shaft of said first superposition gear being connected in a rotationally fixed manner to said third shaft of said second superposition gear, said first shaft of said second superposition gear being connected to said third shaft of said first superposition gear via said second shiftable clutch.