DUAL CLUTCH MULTI-SPEED TRANSMISSION

• US 20100186549A1
• Filed: 11/10/2009
• Published: 07/29/2010
• Est. Priority Date: 01/23/2009
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Ross, Craig S.
• Granted Patent: US 8,434,380 B2
• Time in Patent Office: Days
• US Class Current: 74/665.D
• CPC Class Codes: F16H 2200/0047 the gear ratios comprising five forward speeds
• CPC Class Codes: F16H 3/006 power being selectively transmitted by either one of the parallel flow paths
• CPC Class Codes: F16H 3/089 all of the meshing gears being supported by a pair of parallel shafts, one being the input shaft and the other the output shaft, there being no countershaft involved
• CPC Class Codes: F16H 3/10 with one or more one-way clutches as an essential feature
• CPC Class Codes: Y10T 74/19065 Aligned
• CPC Class Codes: Y10T 74/19228 Multiple concentric clutch shafts

Abstract

A transmission includes an input member, an output transfer gear, first and second shaft members, a countershaft, a reverse shaft member, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output gear.

Claims

1. A transmission comprising:

an input member;

an output member;

a first, second, third, fourth, and fifth gear set, wherein the first gear set has a first gear and a second gear, the second gear set has a first gear and a second gear, the third gear set has a first gear and a second gear, the fourth gear set has a first gear and a second gear, the fifth gear set has a first gear, a second gear and a third gear;

a first interconnecting member continuously connected to the first gear of the second and fourth gear sets;

a second interconnecting member selectively connectable with the first gear of the first, third and fifth gear sets and wherein the first interconnecting member is concentric with the second interconnecting member;

a reverse shaft spaced apart from and parallel with the first and second interconnecting members, and wherein the second gear of the fifth gear set is selectively connectable to the reverse shaft;

a reverse gear continuously connected to the reverse shaft;

a countershaft continuously connected to the output member, the second gear of the third gear set, the second gear of the fifth gear set and selectively connectable with the second gear of the fourth gear set and third gear of the fifth gear set;

a dual clutch assembly selectively engageable to interconnect the input member with at least one of the first interconnecting member and the second interconnecting member; and

three synchronizer assemblies for selectively coupling at least one of the gears of the first, second, third, fourth and fifth gear sets with at least one of the first interconnecting member, the second interconnecting member, the reverse shaft, and the countershaft, and

wherein the dual clutch assembly and three synchronizer assemblies are selectively engageable in combinations of at least two to establish at least five forward speed ratios and at least one reverse speed ratio between the input member and the output member.

2. The transmission of claim 1 wherein the dual clutch assembly includes a first clutch for selectively connecting the input member with the first interconnecting member and a second clutch for selectively connecting the input member with the second interconnecting member.

3. The transmission of claim 1 wherein the first gears of the first, second, third and fourth gear sets intermesh with the second gears of the first, second, third and fourth gear sets, and wherein the first gear of the fifth gear set intermeshes with the second gear and the third gear of the fifth gear set and wherein the reverse gear intermeshes with the second gear of the third gear set.

4. The transmission of claim 1 wherein a first of the three synchronizer assemblies selectively connects the second gear of the fifth gear set to the reverse shaft to establish a reverse gear ratio.

5. The transmission of claim 1 wherein a second of the three synchronizer assemblies selectively connects one of the first gear of the first gear set and first gear of the second gear set to the second interconnecting member.

6. The transmission of claim 5 wherein a second of the three synchronizer assemblies selectively connects the first gear of the first gear set to the second interconnecting member to establish a third gear ratio.

7. The transmission of claim 6 wherein a second of the three synchronizer assemblies selectively connects the first gear of the second gear set to the second interconnecting member to establish a fifth gear ratio.

8. The transmission of claim 1 wherein a third of the three synchronizer assemblies selectively connects one of the second gear of the fourth gear set and the third gear of the fifth gear set to the countershaft.

9. The transmission of claim 8 wherein a third of the three synchronizer assemblies selectively connects the second gear of the fourth gear set to the countershaft to establish a fourth gear ratio.

10. The transmission of claim 8 wherein a third of the three synchronizer assemblies selectively connects the third gear of the fifth gear set to the countershaft to establish a second gear ratio.

11. The transmission of claim 1 wherein the first gear set is adjacent the dual clutch assembly, the second gear set is adjacent the first gear set, the third gear set is adjacent the second gear set, the fourth gear set is adjacent the third gear set, and the fifth gear set is adjacent the fourth gear set.

12. The transmission of claim 1 wherein the output member is connected to the countershaft at a location between the second gear of the first gear set and an end bearing that rotatably supports an end of the countershaft.

13. The transmission of claim 1 wherein the output member is connected to the countershaft at a location between the second gear of the first gear set and second gear of the second gear set.

14. The transmission of claim 1 further comprising a one-way clutch disposed between the first gear of the third gear set for selectively connecting the first gear of the third gear set to the second interconnecting member.

15. A transmission comprising:

an input member;

an output member;

a first, second, third, fourth, and fifth gear set, wherein the first gear set has a first gear, a second gear and a third gear, the second gear set has a first gear and a second gear, the third gear set has a first gear and a second gear, the fourth gear set has a first gear and a second gear, the fifth gear set has a first gear and a second gear;

a first interconnecting member continuously connected to the first gear of the fourth and fifth gear sets;

a second interconnecting member selectively connectable with the first gear of the first, second and third gear sets, wherein the first interconnecting member is concentric with the second interconnecting member;

a reverse shaft spaced apart from and parallel with the first and second interconnecting members, and wherein the second gear of the first gear set is selectively connectable to the reverse shaft;

a reverse gear continuously connected to the reverse shaft;

a countershaft continuously connected to the output member, the second gear of the third gear set, the second gear of the fourth gear set, the second gear of the fifth gear set and selectively connectable with the second gear of the first gear set and the third gear of the second gear set;

a dual clutch assembly selectively engageable to interconnect the input member with at least one of the first interconnecting member and the second interconnecting member; and

three synchronizer assemblies for selectively coupling at least one of the gears of the first, second, third, fourth and fifth gear sets with at least one of the first interconnecting member, the second interconnecting member, the reverse shaft, and the countershaft, and

wherein the dual clutch assembly and three synchronizer assemblies are selectively engageable in combinations of at least two to establish at least five forward speed ratios and at least one reverse speed ratio between the input member and the output member.

16. The transmission of claim 15 wherein the first gear set is adjacent the dual clutch assembly, the second gear set is adjacent the first gear set, the third gear set is adjacent the second gear set, the fourth gear set is adjacent the third gear set, and the fifth gear set is adjacent the fourth gear set.

17. The transmission of claim 15 wherein the dual clutch assembly includes a first clutch for selectively connecting the input member with the first interconnecting member and a second clutch for selectively connecting the input member with the second interconnecting member.

18. The transmission of claim 17 wherein a first of the three synchronizer assemblies selectively connects the second gear of the first gear set to the reverse shaft to establish a reverse gear ratio.

19. The transmission of claim 17 wherein a second of the three synchronizer assemblies selectively connects one of the third gear of the first gear set and second gear of the second gear set to the countershaft.

20. The transmission of claim 19 wherein a second of the three synchronizer assemblies selectively connects the third gear of the first gear set to the countershaft to establish a second gear ratio.

21. The transmission of claim 19 wherein a second of the three synchronizer assemblies selectively connects the second gear of the second gear set to the countershaft to establish a fourth gear ratio.

22. The transmission of claim 17 wherein a third of the three synchronizer assemblies selectively connects one of the first gear of the fourth gear set and the first gear of the fifth gear set to the first interconnecting member.

23. The transmission of claim 22 wherein a third of the three synchronizer assemblies selectively connects the first gear of the fourth gear set to the first interconnecting member to establish a fifth gear ratio.

24. The transmission of claim 22 wherein a third of the three synchronizer assemblies selectively connects the first gear of the fifth gear set to the first interconnecting member to establish a third gear ratio.

25. A transmission comprising:

an input member;

an output member;

a first, second, third, fourth, and fifth gear set, wherein the first gear set has a first gear and a second gear, the second gear set has a first gear and a second gear, the third gear set has a first gear and a second gear, the fourth gear set has a first gear and a second gear, the fifth gear set has a first gear, a second gear and a third gear;

a first interconnecting member continuously connected to the first gear of the second and fourth gear sets;

a second interconnecting member selectively connectable with the first gear of the first, third and fifth gear sets and wherein the first interconnecting member is concentric with the second interconnecting member;

a reverse shaft spaced apart from and parallel with the first and second interconnecting members, and wherein the second gear of the fifth gear set is selectively connectable to the reverse shaft;

a reverse gear continuously connected to the reverse shaft;

a countershaft continuously connected to the output member, the second gear of the third gear set, the second gear of the fifth gear set and selectively connectable with the second gear of the fourth gear set and third gear of the fifth gear set;

a dual clutch assembly selectively engageable to interconnect the input member with at least one of the first interconnecting member and the second interconnecting member and wherein the dual clutch assembly includes a first clutch for selectively connecting the input member with the first interconnecting member and a second clutch for selectively connecting the input member with the second interconnecting member; and

three synchronizer assemblies for selectively coupling at least one of the gears of the first, second, third, fourth and fifth gear sets with at least one of the first interconnecting member, the second interconnecting member, the reverse shaft, and the countershaft, and

wherein the dual clutch assembly and three synchronizer assemblies are selectively engageable in combinations of at least two to establish at least five forward speed ratios and at least one reverse speed ratio between the input member and the output member and wherein a first of the three synchronizer assemblies selectively connects the second gear of the fifth gear set to the reverse shaft to establish a reverse gear ratio, a second of the three synchronizer assemblies selectively connects one of the first gear of the first gear set and first gear of the second gear set to the second interconnecting member to establish at least one of a third and fifth gear ratio and a third of the three synchronizer assemblies selectively connects one of the second gear of the fourth gear set and the third gear of the fifth gear set to the countershaft to establish at least one of a second and fourth gear ratio.