Transmission and a method for operating same

Patent metadata

Field	Value
Publication number	US-9644715-B2
Application number	US-201314437361-A
Country	US
Kind code	B2
Filing date	Oct 17, 2013
Priority date	Oct 22, 2012
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A transmission includes a drive train having a primary drive with a primary drive shaft ( 16 ), particularly for a vehicle, and includes a Ravigneaux planetary gearset ( 2 ) which has a double planetary gear with two sun gear shafts ( 10, 13 ), one planetary carrier shaft ( 18 ) and at least one ring gear shaft ( 12 ), as well as an upstream single planetary gearset ( 3 ) which is designed as a reduction gearing and includes the gear elements of sun gear ( 5 a ), planetary carrier ( 8 a ) and ring gear ( 6 a ). A first of the gear elements of the single planetary gear set ( 2 ), particularly the sun gear ( 5 a ), is designed to be fixed to a housing. At least one first element of the Ravigneaux planetary gear set ( 2 ) is drive-connected, preferably permanently, to a secondary drive ( 21 ) which is particularly preferred to be in the form of an electrical machine.

First claim

The invention claimed is:

1. A transmission which comprises a drive train having a primary drive with a primary drive shaft for a vehicle, and which comprises a Ravigneaux planetary gear set which has a double planetary gear with two sun gear shafts, one planetary carrier shaft and at least one ring gear shaft with a first ring gear, and an upstream single planetary gear set which is arranged as a reduction gearing and comprises the gear elements of sun gear, planetary carrier and ring gear, wherein a first of said gear elements of the single planetary gear is designed to be fixed to a housing, wherein at least one first element of the Ravigneaux planetary gear set is drive-connected to a secondary drive, wherein the first element of the Ravigneaux planetary gear set is formed by a second ring gear.

2. The transmission according to claim 1 , wherein a second element of the Ravigneaux planetary gear set can be blocked by means of a braking device.

3. The transmission according to claim 1 , wherein a third element of the Ravigneaux planetary gear set is drive-connected to a second gear element of the single planetary gear set, or can be drive-connected by means of a second clutch device.

4. The transmission according to claim 1 , wherein the first element is formed by a second sun gear shaft or the planet carrier shaft of the Ravigneaux planetary gear set, and the second element is formed by the planet carrier shaft, or the second sun gear shaft of the Ravigneaux planetary gear set.

5. The transmission according to claim 1 , wherein at least one element of the Ravigneaux planetary gear set can be drive-connected to the primary drive.

6. The transmission according to claim 1 , wherein the Ravigneaux planetary gear set and/or the single planetary gear set are arranged within a rotor of the primary drive or secondary drive.

7. The transmission according to claim 1 , wherein the primary drive shaft and a transmission drive shaft are rotatably connectable by means of a first clutch device.

8. The transmission according to claim 1 , wherein a transmission drive shaft and the planetary carrier shaft of the Ravigneaux planetary gear set are rotatably connectable by means of a third clutch device.

9. A method for operating a transmission which comprises a drive train having a primary drive with a primary drive shaft for a vehicle, and which comprises a Ravigneaux planetary gear set which has a double planetary gear with two sun gear shafts, one planetary carrier shaft and at least one ring gear shaft with a first ring gear, and an upstream single planetary gear set which is arranged as a reduction gearing and comprises the gear elements of sun gear, planetary carrier and ring gear, wherein a first of said gear elements of the single planetary gear is designed to be fixed to a housing, wherein at least one first element of the Ravigneaux planetary gear set is drive-connected to a secondary drive, and the first element of the Ravigneaux planetary gear set is formed by a second ring gear, and wherein the primary drive shaft and a transmission drive shaft are rotatably connectable by means of a first clutch device, and the transmission drive shaft and the planetary gear shaft of the Ravigneaux planetary gear set are rotatably connectable by means of a third clutch device, comprising closing the first clutch device in at least one continuously variable power-split operating range, and closing at least one first device of the group comprising the braking device, second clutch device or third clutch device in at least one gear step operating range.

10. The method according to claim 9 , comprising activating the first clutch device and the second clutch device in a first continuously variable power-split operating range, and closing the first clutch device and the third clutch device in a second continuously variable power-split operating range.

11. The method according to claim 9 , comprising closing the primary drive and the secondary drive in the continuously variable power-split operating range.

12. The method according to claim 9 , comprising operating the primary drive in a transient manner in at least one gear step operating range and operating the secondary drive as a motor or a generator.

13. The method according to claim 9 , comprising deactivating the primary drive in at least one gear step operating range and operating the secondary drive as a motor or a generator.

14. The method according to claim 9 , comprising closing the braking device in a first gear step operating range.

15. The method according to claim 9 , comprising closing the third clutch device is closed in a second gear step operating range.

16. The method according to claim 9 , comprising closing the third clutch device and the braking device in a third gear step operating range.

17. The transmission according to claim 1 , wherein the sun gear of the single planetary gear is designed to be fixed to the housing.

18. The transmission according to claim 1 , wherein at least one first element of the Ravigneaux planetary gear set is drive-connected permanently to the secondary drive.

19. The transmission according to claim 1 , wherein the secondary drive is formed by an electric machine.

20. The transmission according to claim 3 , wherein a first sun gear shaft of the Ravigneaux planetary gear set is drive-connected to the second gear element or can be drive-connected by means of the second clutch device.

21. The transmission according to claim 3 , wherein the third element of the Ravigneaux planetary gear set is drive-connected to the planet carrier of the single planetary gear set, or can be drive-connected by means of the second clutch device.

22. The transmission according to claim 3 , wherein the third element of the Ravigneaux planetary gear set is drive-connected in a permanent manner to the second gear element.

23. The transmission according to claim 5 , wherein the first element of the Ravigneaux planetary gear set can be drive-connected to the primary drive.

24. The transmission according to claim 5 , wherein the planetary carrier shaft of the Ravigneaux planetary gear set can be drive-connected to the primary drive.

25. The transmission according to claim 5 , wherein the primary drive is formed by an internal combustion engine.

26. The method according to claim 9 , comprising closing the second or third clutch device in at least one continuously variable power-split operating range.

27. The method according to claim 9 , comprising closing at least two first devices of the group of the braking device, second clutch device or third clutch device in at least one gear step operating range.

28. The method according to claim 11 , comprising operating the primary drive in a stationary manner, and the secondary drive as a motor or a generator.

29. The method according to claim 14 , comprising closing also the second clutch device in a first gear step operating range.

30. The method according to claim 15 , comprising closing also the second clutch device in a second gear step operating range.

Assignees

• Avl List Gmbh

Inventors

• Lichtenegger Stefan
• Erjawetz Konstantin

Classifications

• F16H2200/2025

  using a Ravigneaux set with 5 connections · CPC title

• F16H3/725 Primary

  with means to change ratio in the mechanical gearing · CPC title

• F16H2200/2097

  comprising an orbital gear set member permanently connected to the housing, e.g. a sun wheel permanently connected to the housing · CPC title

• B60K6/20

  the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs · CPC title

• F16H2200/2023

  using a Ravigneaux set with 4 connections · CPC title