Compound planetary gear unit

1. A compound planetary gear unit, comprising:

a first planetary gear set;

a second planetary gear set;

a planet carrier for both planetary gear sets together;

a first sun gear;

a second sun gear; and,

a first ring gear and a second ring gear;

wherein the first planetary gear set comprises first planetary gears, which are carried by the planet carrier at a radial distance from a central axis of the compound planetary gear unit in such a way that each of said first planetary gears can be rotated about its own first axis of rotation, and which are thereby in meshing engagement with the first sun gear and the first ring gear; and,

wherein the second planetary gear set comprises second planetary gears, which are carried by the planet carrier at the radial distance from the central axis in such a way that each of said second planetary gears can be rotated about an axis of rotation, and which are thereby in meshing engagement with the second sun gear and the second ring gear;

wherein the first sun gear comprises a first gear tooth system with a first number of teeth that is different from a second number of teeth of a second gear tooth system of the second sun gear, and the second planetary gear set comprises at least one planetary gear with a third gear tooth system with a third number of teeth, which is different from a fourth number of teeth of a fourth gear tooth system of at least one of the second planetary gears; and,

wherein the first ring gear has a fifth gear tooth system with a fifth number of teeth that is identical to a sixth number of teeth of a sixth gear tooth system of the second ring gear.

2. The compound planetary gear unit recited in claim 1 , wherein the first number of teeth is greater than the second number of teeth.

3. The compound planetary gear unit recited in claim 1 , wherein the third number of teeth is greater than the fourth number of teeth.

4. The compound planetary gear unit recited in claim 1 , wherein at least two different planetary gears are arranged in at least one of the planetary gear sets, wherein the number of teeth of one of the gear tooth systems of one of the planetary gears is different from the number of teeth of a gear tooth system of the other one of the planetary gears.

5. The compound planetary gear unit recited in claim 1 , wherein the first sun gear is connected in a rotationally rigid manner to the second sun gear and is arranged so as to be rotatable about the central axis together with the second sun gear.

6. The compound planetary gear unit recited in claim 1 , wherein the planetary gears of both sets are accommodated on a common planet carrier.

7. The compound planetary gear unit recited in claim 1 , wherein a first planetary gear of the first planetary gear set sits with a second planetary gear of the second planetary gear set on a common planetary pin, wherein the planetary pin is received by the planet carrier.

8. The compound planetary gear unit recited in claim 1 , wherein one of the ring gears is arranged in such a way that it can be rotated about the central axis; and that a different one of the ring gears is held in a rotationally rigid manner with respect to the central axis.

9. The compound planetary gear unit recited in claim 1 , wherein the first and second ring gears are identical in terms of construction.

10. A compound planetary gear unit, comprising:

a first planetary gear set;

a second planetary gear set;

a planet carrier for both planetary gear sets together;

a first sun gear;

a second sun gear; and,

a first ring gear and a second ring gear;

wherein the first planetary gear set comprises first planetary gears, which are carried by the planet carrier at a radial distance from a central axis of the compound planetary gear unit in such a way that each of said first planetary gears can be rotated about its own first axis of rotation, and which are thereby in meshing engagement with the first sun gear and the first ring gear; and,

wherein the second planetary gear set comprises second planetary gears, which are carried by the planet carrier at the radial distance from the central axis in such a way that each of said second planetary gears can be rotated about an axis of rotation, and which are thereby in meshing engagement with the second sun gear and the second ring gear;

wherein the first sun gear comprises a first gear tooth system with a first number of teeth that is different from a second number of teeth of a second gear tooth system of the second sun gear, and the second planetary gear set comprises at least one planetary gear with a third gear tooth system with a third number of teeth, which is different from a fourth number of teeth of a fourth gear tooth system of at least one of the second planetary gears; and,

wherein the first and second ring gears are identical in terms of construction.

11. The compound planetary gear unit recited in claim 10 , wherein the first number of teeth is greater than the second number of teeth.

12. The compound planetary gear unit recited in claim 10 , wherein the third number of teeth is greater than the fourth number of teeth.

13. The compound planetary gear unit recited in claim 10 , wherein at least two different planetary gears are arranged in at least one of the planetary gear sets, wherein the number of teeth of one of the gear tooth systems of one of the planetary gears is different from the number of teeth of a gear tooth system of the other one of the planetary gears.

14. The compound planetary gear unit recited in claim 10 , wherein the first sun gear is connected in a rotationally rigid manner to the second sun gear and is arranged so as to be rotatable about the central axis together with the second sun gear.

15. The compound planetary gear unit recited in claim 10 , wherein the planetary gears of both sets are accommodated on a common planet carrier.

16. The compound planetary gear unit recited in claim 10 , wherein a first planetary gear of the first planetary gear set sits with a second planetary gear of the second planetary gear set on a common planetary pin, wherein the planetary pin is received by the planet carrier.

17. The compound planetary gear unit recited in claim 10 , wherein one of the ring gears is arranged in such a way that it can be rotated about the central axis; and that a different one of the ring gears is held in a rotationally rigid manner with respect to the central axis.

18. The compound planetary gear unit recited in claim 10 , wherein the first ring gear has a fifth gear tooth system with a fifth number of teeth that is identical to a sixth number of teeth of a sixth gear tooth system of the second ring gear.