MULTI-SPEED GEARBOX

• US 20150094185A1
• Filed: 03/13/2013
• Published: 04/02/2015
• Est. Priority Date: 04/27/2012
• 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, Sibla, Christian, Rieger, Wolfgang
• Granted Patent: US 9,194,464 B2
• Time in Patent Office: Days
• US Class Current: 475/275
• CPC Class Codes: F16H 2003/445 without permanent connection between the input and the set of orbital gears
• CPC Class Codes: F16H 2200/0065 the gear ratios comprising nine forward speeds
• CPC Class Codes: F16H 2200/0069 the gear ratios comprising ten forward speeds
• CPC Class Codes: F16H 2200/0086 the gear ratios comprising two reverse 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 2200/2094 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

Abstract

A four-stage multi-stage transmission, in which a ring gear of a first planetary gear set is connected to a sun gear of a fourth planetary gear set, a ring gear of the fourth planetary gear set is connected to the output shaft, a sun gear of the first planetary gear set and a carrier of a second planetary gear set are couplable to the housing via a first brake, a carrier of the first planetary gear set is couplable to the housing via a second brake, the drive shaft is couplable to the carrier of the fourth planetary gear set via a first clutch, and a ring gear is couplable to the sun gear of the fourth planetary gear set via a second clutch. Adjustment of further couplings, within the multi-stage transmission, facilitates a set of gears having similar properties.

Claims

1-15. -15. (canceled)

16. A multi-stage transmission comprising:

a housing (72),

a drive shaft (70),

an output shaft (71);

at least first, second, third and fourth planetary gear sets (1, 2, 3, 4), each of the first, the second, the third and the fourth planetary gear sets comprising a sun gear, a ring gear and a carrier;

wherein the ring gear (13) of the first planetary gear set (1) is permanently connected to the sun gear (41) of the fourth planetary gear set (4);

the ring gear (43) of the fourth planetary gear set (4) is permanently connected to the output shaft (71);

the sun gear (11) of the first planetary gear set (1) and the carrier (22) of the second planetary gear set (2) are both connectable to the housing (72) via a first brake (51);

the carrier (12) of the first planetary gear set (1) is connectable to the housing (72) via a second brake (52);

one of;

the carrier (32) and the sun gear (31) of the third planetary gear set (3) are connectable via a first clutch,

the ring gear (33) and the sun gear (31) of the third planetary gear set (3) are connectable via the first clutch,

the ring gear (33) and the carrier (32) of the third planetary gear set (3) are connectable via the first clutch, and

the drive shaft (70) and the carrier (42) of the fourth planetary gear set (4) are connectable via the first clutch (61);

one of;

the ring gear (43) and the sun gear (41) of the fourth planetary gear set (4) are connectable via a second clutch (62),

the ring gear (43) and the carrier (42) of the fourth planetary gear set (4) are connectable via the second clutch,

the sun gear (41) and the carrier (42) of the fourth planetary gear set (4) are connectable via the second clutch (62); and

three of first, second, third, fourth and fifth connections are permanent connections and two of the first, the second, the third, the fourth and the fifth connections are releasable connections which are released by at least one shift element;

the first connection connects the drive shaft (70) to the sun gear (21) of the second planetary gear set (2);

the second connection connects the drive shaft (70) to the sun gear (31) of the third planetary gear set (3);

the third connection connects the ring gear (33) of the third planetary gear set (3) to the carrier (22) of the second planetary gear set (2);

the fourth connection connects the carrier (32) of the third planetary gear set (3) to the carrier (42) of the fourth planetary gear set (4); and

the fifth connection connects a ring gear (13) of the first planetary gear set (1) to the ring gear (23) of the second planetary gear set (2).

17. The multi-stage transmission according to claim 16, wherein

the drive shaft (70) is connectable to the sun gear (21) of the second planetary gear set (2) via a third clutch (63);

and

the ring gear (13) of the first planetary gear set (1) is permanently connected to the ring gear (23) of the second planetary gear set (2).

18. The multi-stage transmission according to claim 17, wherein

the drive shaft (70) is connectable to the sun gear (31) of the third planetary gear set (3) via a fourth clutch (64);

the ring gear (33) of the third planetary gear set (3) is permanently connected to the carrier (22) of the second planetary gear set (2); and

the carrier (32) of the third planetary gear set (3) is permanently connected to the carrier (42) of the fourth planetary gear set (4).

19. The multi-stage transmission according to claim 17, wherein

the drive shaft (70) is permanently connected to the sun gear (31) of the third planetary gear set (3);

the ring gear (33) of the third planetary gear set (3) is connectable to the carrier (22) of the second planetary gear set (2) via a fourth clutch (65); and

the carrier (32) of the third planetary gear set (3) is permanently connected to the carrier (42) of the fourth planetary gear set (4).

20. The multi-stage transmission according to claim 17, wherein

the drive shaft (70) is permanently connected to the sun gear (31) of the third planetary gear set (3);

the ring gear (33) of the third planetary gear set (3) is permanently connected to the carrier (22) of the second planetary gear set (2); and

the carrier (32) of the third planetary gear set (3) is connectable to the carrier (42) of the fourth planetary gear set (4) via a fourth clutch (66).

21. The multi-stage transmission according to claim 16, wherein

the drive shaft (70) is permanently connected to the sun gear (21) of the second planetary gear set (2);

and

the ring gear (13) of the first planetary gear set (1) is connectable to the ring gear (23) of the second planetary gear set (2) via a fourth clutch (67).

22. The multi-stage transmission according to claim 21, wherein

the drive shaft (70) is couplable to the sun gear (31) of the third planetary gear set (3) via a fourth clutch (64);

the ring gear (33) of the third planetary gear set (3) is permanently connected to the carrier (22) of the second planetary gear set (2); and

the carrier (32) of the third planetary gear set (3) is permanently connected to the carrier (42) of the fourth planetary gear set (4).

23. The multi-stage transmission according to claim 21, wherein

the drive shaft (70) is permanently connected to the sun gear (31) of the third planetary gear set (3);

the ring gear (33) of the third planetary gear set (3) is connectable to the carrier (22) of the second planetary gear set (2) via a fourth clutch (65); and

the carrier (32) of the third planetary gear set (3) is permanently connected to the carrier (42) of the fourth planetary gear set (4).

24. The multi-stage transmission according to claim 21, wherein

the drive shaft (70) is permanently connected to the sun gear (31) of the third planetary gear set (3);

the ring gear (33) of the third planetary gear set (3) is permanently connected to the carrier (22) of the second planetary gear set (2); and

the carrier (32) of the third planetary gear set (3) is connectable to the carrier (42) of the fourth planetary gear set (4) and to a further shaft (78) via a fourth clutch (66).

25. The multi-stage transmission according to claim 18, wherein selective engagement of three of the first and the second brakes and the first, the second, the third and the fourth clutches implements a plurality of gears;

a first gear is implemented by engagement of the first brake (51), the second clutch (62) and the fourth clutch (64, 65, 66),

a second gear is implemented by engagement of the first brake (51), the second brake (52) and the fourth clutch (64, 65, 66),

a third gear is implemented by engagement of the first brake (51), the third clutch (63, 67) and the fourth clutch (64, 65, 66),

a fourth gear is implemented by engagement of the second brake (52), the third clutch (63, 67) and the fourth clutch (64, 65, 66),

a fifth gear is either implemented by engagement of the first clutch (61), the third clutch (63, 67) and the fourth clutch (64, 65, 66) or by engagement of the first clutch (61), the second clutch (62) and the fourth clutch (64, 65, 66),

a sixth gear is implemented by engagement of the second brake (52), the first clutch (61) and the fourth clutch (64, 65, 66),

a seventh gear is implemented by engagement of the second brake (52), the first clutch (61) and the third clutch (63, 67),

an eighth gear is implemented by engagement of the first brake (51), the second brake (52) and the first clutch (61),

a ninth gear is implemented by engagement of the first brake (51), the first clutch (61) and the third clutch (63, 67),

a reverse gear is implemented by engagement of the first brake (51), the second clutch (62) and the third clutch (63, 67),

an additional forward gear is implemented by engagement of the second brake (52), the second clutch (62) and the third clutch (63, 67), and

an additional reverse gear is implemented by engagement of the second brake (52), the second clutch (62) and the fourth clutch (64, 65, 66).

26. The multi-stage transmission according to claim 22, wherein selective engagement of three of the first and the second brakes and the first, the second, the third and the fourth clutches implements a plurality of gears;

a first gear is implemented by engagement of the first brake (51), the second clutch (62) and the fourth clutch (64, 65, 66),

a second gear is implemented by engagement of the first brake (51), the second brake (52) and the fourth clutch (64, 65, 66),

a third gear is implemented by engagement of the first brake (51), the third clutch (67) and the fourth clutch (64, 65, 66),

a fourth gear is implemented by engagement of the second brake (52), the third clutch (67) and the fourth clutch (64, 65, 66),

a fifth gear is implemented either by engagement of the first clutch (61), the third clutch (67) and the fourth clutch (64, 65, 66) or by engagement of the first clutch (61), the second clutch (62) and the fourth clutch (64, 65, 66),

a sixth gear is implemented by engagement of the second brake (52), the first clutch (61) and the fourth clutch (64, 65, 66),

a seventh gear is implemented by engagement of the second brake (52), the first clutch (61) and the third clutch (67),

an eighth gear is implemented by engagement of the first brake (51), the second brake (52) and the first clutch (61),

a ninth gear is implemented by engagement of the first brake (51), the first clutch (61) and the third clutch (67),

a reverse gear is implemented by engagement of the first brake (51), the second clutch (62) and the third clutch (67),

an additional forward gear is implemented by engagement of the second brake (52), the second clutch (62) and the third clutch (67), and

an additional reverse gear is implemented by engagement of the second brake (52), the second clutch (62) and the fourth clutch (64, 65, 66).

27. The multi-stage transmission according to claim 16, wherein

the first planetary gear set (1) is a plus planetary gear set,

the second planetary gear set (2) is a minus planetary gear set,

the third planetary gear set (3) is a minus planetary gear set, and

the fourth planetary gear set (4) is a minus planetary gear set.

28. The multi-stage transmission according to claim 27, wherein at least one of:

a transmission ratio of the first planetary gear set (1), between the sun gear (11) and the ring gear (12) thereof, is +1.600;

a transmission ratio of the second planetary gear set (2), between the sun gear (21) and the ring gear (22) thereof, is −

3.200;

a transmission ratio of the third planetary gear set (3), between the sun gear (31) and the ring gear (32) thereof, is −

3.700;

a transmission ratio of the fourth planetary gear set (4), between the sun gear (41) and the ring gear (42) thereof, is −

1.600.

29. The multi-stage transmission according to claim 16, wherein instead of a first specified connection/coupling to a carrier (12, 22, 32, 42) of a planetary gear set (1, 2, 3, 4) and a second specified connection/coupling to a ring gear (13, 23, 33, 43) of this gear set (1, 2, 3, 4), the first specified connection/coupling is formed to said ring gear (13, 23, 33, 43) of this gear set (1, 2, 3, 4) and the second specified connection/coupling is formed to said carrier (12, 22, 32, 42) of this gear set (1, 2, 3, 4), and this gear set (1, 2, 3, 4) is configured as a plus gear set instead of as a minus gear set and as a minus gear set instead of as a plus gear set, respectively.

30. The multi-stage transmission according to claim 16, wherein the second clutch (62) and the fourth clutch (64, 65, 66) are configured as claw clutches.