Seven speed dual clutch transmission

Patent metadata

Field	Value
Publication number	US-9625006-B2
Application number	US-201213621562-A
Country	US
Kind code	B2
Filing date	Sep 17, 2012
Priority date	Mar 1, 2010
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A transmission includes an input member, an output member, first and second interconnecting members, first and second countershaft members, 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 member.

First claim

The invention claimed is:

1. A transmission comprising:
an input member;
an output member;
a plurality of gear sets, wherein each gear set has a first gear in mesh with a second gear;
a plurality of interconnecting members, wherein each of the first gears of each of the plurality of gear sets are fixed for common rotation to one of the plurality of interconnecting members and each of the plurality of interconnecting members are selectively connected to the input member by one of a plurality of torque transmitting mechanisms;
a plurality of countershafts, wherein each of the second gears of the plurality of gear sets are selectively connected for common rotation to one of the plurality of countershafts; and
a plurality of synchronizer assemblies each selectively coupling one of a pair of the second gears of the plurality of gear sets to one of the plurality of countershafts, and
wherein the selective engagement of one of a plurality of torque transmitting mechanisms and one of the plurality of synchronizer assemblies establishes one of a plurality of forward speed ratios between the input member and the output member and a first and a second of the plurality of gear sets each further include a third gear in mesh with the respective first gear and wherein the third gears are selectively connectable for common rotation to one of the plurality of countershafts.

2. The transmission of claim 1 further comprising a differential assembly, and wherein the plurality of countershafts each include a transfer gear in constant mesh with the output member.

3. The transmission of claim 2 further comprising a park gear and a park transfer gear, wherein the park gear is rotatably supported by one of the plurality of countershafts and rotatably connected to the park transfer gear which is in constant mesh with the output gear of the differential assembly.

4. The transmission of claim 1 wherein the third gear of the first of the plurality of gear sets in mesh with the second gear and wherein the third gear is selectively connectable for common rotation to one of the plurality of countershafts.

5. The transmission of claim 1 wherein the second gear of the first of the plurality of gear sets includes a first portion meshed with the first gear and having a first diameter and a second portion having a second diameter that is different from the first diameter.

6. The transmission of claim 5 wherein the third gear of the first of the plurality of gear sets in mesh with the second portion of the second gear and selectively connectable to one of the plurality of countershafts.

7. The transmission of claim 1 wherein the plurality of gear sets include a third, fourth, and fifth gear sets, wherein the third gear of the first of the plurality of gear sets is selectively connectable to one of the countershafts and in mesh with the second gear of the first gear set, the third gear of the second gear set is selectively connectable to one of the countershafts and in mesh with the first gear of the second gear set, the third gear set further includes a third gear selectively connectable to one of the countershafts and in mesh with the first gear of the third gear set.

8. The transmission of claim 7 wherein a first of the plurality of interconnecting members is fixed for common rotation with each of the first gears of the third, fourth and fifth gear set.

9. The transmission of claim 8 wherein a second of the plurality of interconnecting members is fixed for common rotation with each of the first gears of the first and second gear sets and wherein the second of the plurality of interconnecting members is concentric with and at least partially surrounds the first of the plurality of interconnecting.

10. The transmission of claim 9 wherein a first of the plurality of countershafts is disposed parallel with the first and second of the plurality of interconnecting members, wherein the third gear of the first gear set, the third gear of the second gear set, the third gear of the third gear set and the second gear of the fourth gear set are each selectively connectable for common rotation with the first of the plurality of countershafts.

11. The transmission of claim 10 wherein a second of the plurality of countershafts is disposed parallel with the first and second of the plurality of interconnecting members, wherein the second gear of the first gear set and the second gear of the second gear set are each selectively connectable for common rotation with the second of the plurality of countershafts.

12. The transmission of claim 11 further including a dual clutch assembly including a first and a second of the plurality of torque transmitting mechanisms.

13. A transmission comprising:
an input member;
a plurality of gear sets, wherein each gear set has a first gear in mesh with a second gear;
a plurality of interconnecting members, wherein each of the first gears of each of the plurality of gear sets are fixed for common rotation to one of the plurality of interconnecting members and each of the plurality of interconnecting members are selectively connected to the input member by one of a plurality of torque transmitting mechanisms;
a plurality of countershafts, wherein each of the second gears of the plurality of gear sets are selectively connected for common rotation to one of the plurality of countershafts;
a differential assembly having an output gear, and wherein the plurality of countershafts each include a transfer gear in constant mesh with the output gear of the differential assembly;
a park gear and a park transfer gear, wherein the park gear is rotatably supported by one of the plurality of countershafts and rotatably connected to the park transfer gear which is in constant mesh with the output gear of the differential assembly;
a plurality of synchronizer assemblies each selectively coupling one of a pair of the second gears of the plurality of gear sets to one of the plurality of countershafts, and
wherein the selective engagement of one of a plurality of torque transmitting mechanisms and one of the plurality of synchronizer assemblies establishes one of a plurality of forward speed ratios between the input member and the output gear and a first and a second of the plurality of gear sets each further include a third gear in mesh with the respective first gear and wherein the third gears of each of the first and second of the plurality of gear sets are selectively connectable for common rotation to one of the plurality of countershafts.

14. The transmission of claim 13 wherein a third of the plurality of gear sets further includes a third gear in mesh with the second gear and wherein the third gear of the third of the plurality of gear sets is selectively connectable for common rotation to one of the plurality of countershafts.

15. The transmission of claim 13 wherein the second gear of a first of the plurality of gear sets includes a first portion meshed with the first gear and having a first diameter and a second portion having a second diameter that is different from the first diameter.

16. The transmission of claim 15 wherein the third gear of the first of the plurality of gear sets in mesh with the second portion of the second gear and wherein the third gear is selectively connectable to one of the plurality of countershafts.

17. The transmission of claim 13 wherein the plurality of gear sets include a third, fourth, and fifth gear sets, wherein the third gear of the first of the plurality of gear sets is selectively connectable to one of the countershafts and in mesh with the second ge

Assignees

• Mohlin Mikael B
• Singh Tejinder
• Portell Patrick S
• Zini David M
• Gm Global Tech Operations Llc

Inventors

• Mohlin Mikael B
• Singh Tejinder
• Portell Patrick S
• Zini David M

Classifications

• Y10T74/19233

  Plurality of counter shafts · CPC title

• F16H2003/0807

  with gear ratios in which the power is transferred by axially coupling idle gears to each other · CPC title

• F16H3/006 Primary

  power being selectively transmitted by parallel flow paths, e.g. dual clutch transmissions · CPC title

• F16H2200/0056

  the gear ratios comprising seven forward speeds · CPC title

• F16H3/62 Primary

  Gearings having three or more central gears (F16H3/68 - F16H3/78 take precedence) · CPC title