Transmission for a vehicle

• US 10,018,253 B2
• Filed: 09/27/2016
• Issued: 07/10/2018
• Est. Priority Date: 09/28/2015
• Status: Active Grant

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Beck, Stefan, Warth, Viktor, Wechs, Michael, Brehmer, Martin
• Primary Examiner(s): Hlavka, David J
• Application Number:
  US15/277,373
• Publication Number:
  US 20170089430A1
• Time in Patent Office: 651 Days
• CPC Class Codes: B60K 2006/4825 Electric machine connected or connectable to gearbox input shaft
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60Y 2300/70 Control of gearings
• CPC Class Codes: F16H 2003/442 comprising two or more sets of orbital gears arranged in a single plane
• CPC Class Codes: F16H 2200/0052 the gear ratios comprising six forward speeds
• CPC Class Codes: F16H 2200/0086 the gear ratios comprising two reverse speeds
• CPC Class Codes: F16H 2200/2007 with two sets of orbital gears
• CPC Class Codes: F16H 2200/201 with three sets of orbital gears
• CPC Class Codes: F16H 2200/2046 with six engaging means
• CPC Class Codes: F16H 2200/2064 using at least one positive clutch, e.g. dog clutch
• CPC Class Codes: F16H 2200/2094 using positive clutches, e.g. dog clutches
• CPC Class Codes: F16H 3/66 composed of a number of gear trains without drive passing from one train to another
• CPC Class Codes: F16H 3/724 using external powered electric machines
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/919 Stepped shift

Abstract

A transmission for a motor vehicle includes a first planetary gear set with at least three central gears which are formed by a ring gear and two sun gears or by two ring gears and one sun gear. A second planetary gear set includes two central gears which are formed by one ring gear and one sun gear. One of the central gears of the second planetary gear set is constantly connected in a torque-proof manner to one of the central gears of the first planetary gear set. The one of the central gears of the first planetary gear set differs from and is arranged in a common gear set plane with the one of the central gears of the second planetary gear set. A carrier of the first planetary gear set is constantly connected in a torque-proof manner to a carrier of the second planetary gear set.

Claims

1. A transmission for a motor vehicle, comprising:

a first planetary gear set formed as a stepped planetary gear set, the first planetary gear set having planetary gears of a smaller effective diameter and planetary gears of a larger effective diameter, the first planetary gear set comprising at least three central gears which are formed by one ring gear and two sun gears of the first planetary gear set;

a second planetary gear set comprising two central gears which are formed by one ring gear and one sun gear of the second planetary gear set, one of the central gears of the second planetary gear set is constantly connected in a torque-proof manner to one of the central gears of the first planetary gear set,

wherein the one of the central gears of the second planetary gear set differs from the one of the central gears of the first planetary gear set, the one of the central gears of the second planetary gear set arranged in a common gear set plane with the one of the central gears of the first planetary gear set,

wherein a carrier of the first planetary gear set is constantly connected in a torque-proof manner to a carrier of the second planetary gear set, and

wherein the planetary gears of the larger effective diameter are allocated to a first sun gear of the two sun gears and the planetary gears of the smaller effective diameter are allocated to a second sun gear of the two sun gears.

2. The transmission of claim 1, wherein the carriers of the first and second planetary gear sets are constantly connected to an output shaft of the transmission.

3. The transmission of claim 1, wherein the first planetary gear set comprises an additional central gear which is formed by an additional ring gear.

4. The transmission of claim 1, wherein another one of the central gears of the first planetary gear set is not constantly connected in a torque-proof manner to any of the central gears of the second planetary gear set, the another one of the central gears of the first planetary gear set fixable in a torque-proof manner by a shifting element.

5. The transmission of claim 4, wherein another one of the central gears of the second planetary gear set is not constantly connected in a torque-proof manner to any of the central gears of the first planetary gear set, the another one of the central gears of the second planetary gear set fixable in a torque-proof manner by an additional shifting element.

6. The transmission of claim 1, wherein at least one of the central gears of the first planetary gear set is not constantly connected in a torque-proof manner to any of the central gears of the second planetary gear set, the at least one of the central gears of the first planetary gear set connectable to a drive shaft of the transmission by a shifting element.

7. The transmission of claim 1, wherein another one of the central gears of the second planetary gear set is not constantly connected in a torque-proof manner to any of the central gears of the first planetary gear set, the another one of the central gears of the second planetary gear set connectable to a drive shaft of the transmission by a shifting element.

8. The transmission of claim 1, wherein the sun gear of the second planetary gear set is constantly connected in a torque-proof manner to the ring gear of the first planetary gear set, the ring gear of the first planetary gear set meshes with the planetary gears of the smaller effective diameter.

9. The transmission of claim 8, wherein the first sun gear of the first planetary gear set is fixable in a torque-proof manner by a first shifting element, and the second sun gear of the first planetary gear set is fixable in a torque-proof manner by locking a second shifting element.

10. The transmission of claim 9, wherein the ring gear of the second planetary gear set is fixable in a torque-proof manner by locking a third shifting element.

11. The transmission of claim 10, wherein the ring gear of the second planetary gear set is connectable to a drive shaft of the transmission by locking a fourth shifting element.

12. The transmission of claim 11, wherein the first planetary gear set comprises an additional central gear which is formed by an additional ring gear, the additional ring gear of the first planetary gear set meshes with the planetary gears of the larger effective diameter, the additional ring gear of the first planetary gear set connectable to the drive shaft of the transmission by locking a fifth shifting element.

13. The transmission of claim 12, wherein the transmission is shiftable between six forward gears through selective locking in pairs of the first through fifth shifting elements, wherein

a first forward gear arises by locking the third shifting element and the fifth shifting element,

a second forward gear arises by locking the second shifting element and the fifth shifting element,

a third forward gear arises by locking the first shifting element and the fifth shifting element,

a fourth forward gear arises by locking the fourth shifting element and the fifth shifting element,

a fifth forward gear arises by locking the first shifting element and the fourth shifting element, and

a sixth forward gear arises by locking the second shifting element and the fourth shifting element.

14. The transmission of claim 13, wherein the first sun gear of the first planetary gear set is connectable to the drive shaft of the transmission by locking a sixth shifting element.

15. The transmission of claim 14, wherein the transmission is shiftable to a reverse gear that arises through locking the third shifting element and the sixth shifting element.

16. The transmission of claim 1, further comprising an electric motor with a torque-proof stator and a rotatable rotor, the rotor is constantly connected to a drive shaft of the transmission.

19. The transmission of claim 1, wherein the first planetary gear set comprises an additional central gear which is formed by an additional sun gear.

17. A transmission for a motor vehicle, comprising:

a first planetary gear set formed as a stepped planetary gear set, the first planetary gear set having planetary gears of a smaller effective diameter and planetary gears of a larger effective diameter, the first planetary gear set comprising at least three central gears which are formed by two ring gears and one sun gear of the first planetary gear set;

a second planetary gear set comprising two central gears which are formed by one ring gear and one sun gear of the second planetary gear set, one of the central gears of the second planetary gear set is constantly connected in a torque-proof manner to one of the central gears of the first planetary gear set,

wherein the one of the central gears of the second planetary gear set differs from the one of the central gears of the first planetary gear set, the one of the central gears of the second planetary gear set arranged in a common gear set plane with the one of the central gears of the first planetary gear set,

wherein a carrier of the first planetary gear set is constantly connected in a torque-proof manner to a carrier of the second planetary gear set, and

wherein the planetary gears of the larger effective diameter are allocated to a first ring gear of the two ring gears and the planetary gears of the smaller effective diameter are allocated to a second ring gear of the two ring gears.

18. The transmission of claim 17, wherein the carriers of the first and second planetary gear sets are constantly connected to an output shaft of the transmission.

20. The transmission of claim 17, wherein another one of the central gears of the first planetary gear set is not constantly connected in a torque-proof manner to any of the central gears of the second planetary gear set, the another one of the central gears of the first planetary gear set fixable in a torque-proof manner by a shifting element.

21. The transmission of claim 20, wherein another one of the central gears of the second planetary gear set is not constantly connected in a torque-proof manner to any of the central gears of the first planetary gear set, the another one of the central gears of the second planetary gear set fixable in a torque-proof manner by an additional shifting element.

22. The transmission of claim 17, wherein at least one of the central gears of the first planetary gear set is not constantly connected in a torque-proof manner to any of the central gears of the second planetary gear set, the at least one of the central gears of the first planetary gear set connectable to a drive shaft of the transmission by a shifting element.

23. The transmission of claim 17, wherein another one of the central gears of the second planetary gear set is not constantly connected in a torque-proof manner to any of the central gears of the first planetary gear set, the another one of the central gears of the second planetary gear set connectable to a drive shaft of the transmission by a shifting element.

24. The transmission of claim 17, wherein the sun gear of the second planetary gear set is constantly connected in a torque-proof manner to the second ring gear of the first planetary gear set.

25. The transmission of claim 17, further comprising an electric motor with a torque-proof stator and a rotatable rotor, the rotor is constantly connected to a drive shaft of the transmission.