Multi-speed transmission

• US 7,575,533 B2
• Filed: 02/09/2007
• Issued: 08/18/2009
• Est. Priority Date: 02/14/2006
• Status: Expired due to Fees

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Gumpoltsberger, Gerhard
• Primary Examiner(s): PANG, ROGER L
• Application Number:
  US11/705,073
• Publication Number:
  US 20080125269A1
• Time in Patent Office: 921 Days
• Field of Search: 475275-291
• US Class Current: 475/280
• CPC Class Codes: F16H 2200/0065 the gear ratios comprising nine forward speeds
• CPC Class Codes: F16H 2200/2012 with four sets of orbital gears
• CPC Class Codes: F16H 2200/2046 with six engaging means
• CPC Class Codes: F16H 2200/2097 comprising an orbital gear set member permanently connected to the housing, e.g. a sun wheel permanently connected to the housing
• CPC Class Codes: F16H 3/66 composed of a number of gear trains without drive passing from one train to another

Abstract

A multi-speed transmission with nine forward gears and one reverse gear, four planetary gear sets, seven shafts and six shifting elements. The input shaft is coupled to gear sets (P2, P3); shaft (3) is coupled to the carrier of gear set (P2) and the ring of gear set (P1) and is coupleable to the housing (G); shaft (4) is coupled to the ring of gear set (P3), the carrier of gear set (P4) and is coupleable to the housing; shaft (5) couples with gear set (P4) and the ring of gear set (P2) couples the housing (G), and via clutch (57) to shaft (7), which is coupled to the carrier of gear set (P1); shaft (6) is coupled to the carrier of gear set (P3) and coupleable via clutch (26) to output shaft which couples the ring of gear set (P4); the sun of gear set (P1) couples the housing.

Claims

1. A multi-speed automatic transmission of a planetary design for a motor vehicle, the transmission comprising:

an input shaft (1) and an output shaft (2) arranged in a housing (G);

first, second, third, and fourth planetary gear sets (P1, P2, P3, P4), and each of the first, the second, the third, and the fourth planetary gear sets (P1, P2, P3, P4) comprising a sun gear, a carrier and a ring gear;

at least third, fourth, fifth, sixth and seventh rotatable shafts (3, 4, 5, 6, 7) as well as at least six shifting elements (03, 04, 05, 14, 16, 26, 46, 57), comprising first, second, and third brakes (03, 04, 05) and first, second, and third, clutches (14, 16, 26, 48, 57), whose selective engagement creates different gear ratios between the input shaft (1) and the output shaft (2) so that at least nine forward gears and one reverse gear can be implemented;

wherein the input shaft (1) is permanently connected to the sun gear of the second planetary gear set (P2) and the sun gear of the third planetary gear set (P3);

the third shaft (3) is permanently connected to the carrier of the second planetary gear set (P2) and the ring gear of the first planetary gear set (P1), and is detachably connected, via the first brake (03), to the housing (G);

the fourth shaft (4) is permanently connected to the ring gear of the third planetary gear set (P3) and the carrier of the fourth planetary gear set (P4), and is detachably connected, via the second brake (04), to the housing (G);

the fifth shaft (5) is permanently connected to the sun gear of the fourth planetary gear set (P4) and the ring gear of the second planetary gear set (P2), and is detachably connected, via the third brake (05), to the housing (G), and, via the third clutch (57), to the seventh shaft (7);

the seventh shaft (7) is permanently connected to the carrier of the first planetary gear set (P1);

the sixth shaft (6) is permanently connected to the carrier of the third planetary gear set (P3) and detachably connected to the output shaft (2);

the output shaft (2) is permanently connected to the ring gear of the fourth planetary gear set (P4);

the sun gear of the first planetary gear set (P1) is fixed to the housing (G); and

one of;

the input shaft (1) is detachably connected, via the first clutch (14), to the fourth shaft (4);

the input shaft (1) is detachably connected, via the first clutch (16), to the sixth shaft (6); and

the fourth shaft (4) is detachably connected, via the first clutch (46), to the sixth shaft (6).

2. The multi-speed transmission according to claim 1, wherein the first, the second, the third, and the fourth planetary gear sets (P1, P2, P3, P4) are arranged in an axial direction in the sequential order of:

the first planetary gear set (P1), the second planetary gear set (P2), the third planetary gear set (P3) and the fourth planetary gear set (P4).

3. The multi-speed transmission according to claim 1, wherein the planetary first, the second, the third, and the fourth planetary gear sets (P1, P2, P3, P4) are negative planetary gear sets.

4. The multi-speed transmission according to claim 1, wherein the input shaft (1) is detachably connected, via the first clutch (14), to the fourth shaft (4), and

a first gear results from engagement of the first and the second brakes (03, 04), a second gear results from engagement of the second brake (04) and the second clutch (26), a third gear results from engagement of the second clutch (26) and the first brake (03), a fourth gear results from engagement of the second clutch (26) and the third brake (05), a fifth gear results from engagement of the second and third clutches (26, 57), a sixth gear results from engagement of the first and the second clutches (14, 26), a seventh gear results from engagement of the first and the third clutches (14, 57), an eighth gear results from engagement of the third brake (05) and the first clutch (14), and a ninth gear results from engagement of the first brake (03) and the first clutch (14).

5. The multi-speed transmission according to claim 1, wherein a reverse gear results from engagement of the second brake (04) and the third clutch (57).

6. The multi-speed transmission according to claim 1, wherein at least one one-way clutch is located within the transmission.

7. The multi-speed transmission according to claim 6, wherein the at least one one-way clutch is located between the housing (G) and one of the input shaft (1), the output (2), the third shaft (3), the fourth shaft (4), the fifth shaft (5), the sixth shaft (6) and the seventh shaft (7).

8. The multi-speed transmission according to claim 1, wherein an input and an output are located on a common side of the housing (G).

9. The multi-speed transmission according to claim 1, wherein at least one of an axle differential and a distributor differential is located one of the input shaft (1) and the output shaft (2).

10. The multi-speed transmission according to claim 1, wherein a coupling element facilitates separation of the input shaft (1) from a drive motor.

11. The multi-speed transmission according to claim 10, wherein the coupling element is one of a hydrodynamic converter, a hydraulic clutch, a dry starting clutch, a wet starting clutch, a magnetic powder clutch, and a centrifugal clutch.

12. The multi-speed transmission according to claim 1, wherein an external drive element is located downstream of the transmission, in a direction of power flow, and the input shaft (1) is firmly connected to a crankshaft of a drive motor.

13. The multi-speed transmission according to claim 1, wherein the vehicle is started via one of the at least six shifting elements (04) of the transmission, and the input shaft (1) is permanently connected to a crankshaft of the drive motor.

14. The multi-speed transmission according to claim 1, wherein a torsional vibration damper is located between a drive motor and the transmission.

15. The multi-speed transmission according to claim 1, wherein a wear-free brake is arranged on at least one of the input shaft (1), the output (2), the third shaft (3), the fourth shaft (4), the fifth shaft (5), the sixth shaft (6) and the seventh shaft (7).

16. The multi-speed transmission according to claim 1, wherein a power take-off is arranged on at least one of the input shaft (1), the output (2), the third shaft (3), the fourth shaft (4), the fifth shaft (5), the sixth shaft (6) and the seventh shaft (7) for driving an additional unit.

17. The multi-speed transmission according to claim 16, wherein the power take-off is arranged on one of the input shaft (1) and the output shaft (2).

18. The multi-speed transmission according to claim 1, wherein the six shifting elements are one of power-shift clutches and power-shift brakes.

19. The multi-speed transmission according to claim 18, wherein the six shifting elements are one of multi-disk clutches, band brakes, and cone clutches.

20. The multi-speed transmission according to claim 1, wherein the six shifting elements are one of positive brakes and positive clutches.

21. The multi-speed transmission according to claim 1, wherein an electric machine is arranged on at least one of the input shaft (1), the output (2), the third shaft (3), the fourth shaft (4), the fifth shaft (5), the sixth shaft (6) and the seventh shaft (7) as one of a generator and an additional drive unit.