Multi-speed transmission with external drive gearsets

• US 7,896,772 B2
• Filed: 02/25/2008
• Issued: 03/01/2011
• Est. Priority Date: 09/24/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Hart, James M., Carey, Clinton E., Phillips, Andrew W., Wittkopp, Scott H.
• Primary Examiner(s): HO, HA DINH
• Application Number:
  US12/036,632
• Publication Number:
  US 20090082157A1
• Time in Patent Office: 1,100 Days
• Field of Search: 475/207, 475/219, 475275-278, 475/284
• US Class Current: 475/275
• CPC Class Codes: F16H 2200/0008 specially adapted for front-wheel-driven vehicles
• CPC Class Codes: F16H 2200/006 the gear ratios comprising eight forward speeds
• CPC Class Codes: F16H 2200/201 with three sets of orbital gears
• CPC Class Codes: F16H 2200/2043 with five engaging means
• CPC Class Codes: F16H 3/66 composed of a number of gear trains without drive passing from one train to another

Abstract

A transmission is provided having an input member, an output member, three planetary gear sets, four external gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. Each of the external gear sets includes first and second gears. The torque transmitting devices may include clutches and brakes.

Claims

1. A transmission comprising:

an input member;

an output member;

a first, second, and third planetary gear set each having a first, second, and third member;

a first, second, third, and fourth co-planar gear set each having a first gear intermeshed with a second gear;

a first interconnecting member continuously interconnecting the second gear of the first co-planar gear set with the first member of the first planetary gear set;

a second interconnecting member continuously interconnecting the third member of the first planetary gear set with the first gear of the second co-planar gear set;

a third interconnecting member continuously interconnecting the first gear of the third co-planar gear set with the third member of the second planetary gear set and the first member of the third planetary gear set;

a fourth interconnecting member continuously interconnecting the first member of the second planetary gear set with the second gear of the second co-planar gear set;

a fifth interconnecting member continuously interconnecting the second member of the third planetary gear set with the first gear of the fourth co-planar gear set; and

five torque transmitting mechanisms each selectively engageable to interconnect at least one of the first members, second members, third members, first gears, and second gears with at least another of the first members, second members, third members, first gears, second gears, and a stationary element, and

wherein the torque transmitting mechanisms are selectively engageable in combinations of at least three to establish at least eight 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 a first of the five torque transmitting mechanisms is selectively engageable to interconnect the second gear of the third co-planar gear set with at least one of the second member of the first planetary gear set and the input member.

3. The transmission of claim 2 wherein a second of the five torque transmitting mechanisms is selectively engageable to interconnect at least one of the third member of the first planetary gear set and the first gear of the second co-planar gear set with the second gear of the third co-planar gear set.

4. The transmission of claim 3 wherein a third of the five torque transmitting mechanisms is selectively engageable to interconnect the first gear of the first co-planar gear set with the third member of the third planetary gear set.

5. The transmission of claim 4 wherein a fourth of the five torque transmitting mechanisms is selectively engageable to interconnect the third member of the third planetary gear set with the second member of the second planetary gear set.

6. The transmission of claim 5 wherein a fifth of the five torque transmitting mechanisms is selectively engageable to interconnect at least one of the second gear of the first co-planar gear set and the first member of the first planetary gear set with the stationary element.

7. The transmission of claim 1 wherein the input member is continuously interconnected with the second member of the first planetary gear set and wherein the output member is continuously interconnected with the second gear of the fourth co-planar gear set.

8. The transmission of claim 1 wherein the first members are sun gears, the second members are carrier members, and the third members are ring gears.

9. The transmission of claim 6 wherein the first and second torque transmitting mechanisms are connected to the second gear of the third co-planar gear set by a first sleeve shaft, wherein the fifth torque transmitting mechanism is connected to the second gear of the first co-planar gear set and the first member of the first planetary gear set by a second sleeve shaft, and wherein the first and second sleeve shafts are concentric with the input member.

10. The transmission of claim 1 wherein the input member, the first and second interconnecting members, and the first planetary gear set are co-axial and wherein the third, fourth, and fifth interconnecting members, the second planetary gear set, and the third planetary gear set are co-axial, and wherein the output member is offset from the first, second, third, fourth, and fifth interconnecting members and the input member.

11. The transmission of claim 6 wherein the fourth torque transmitting mechanism is connected to the second member of the second planetary gear set by a third sleeve shaft that is concentric with the third and fourth interconnecting members.

12. The transmission of claim 1 wherein the stationary element is a transmission housing.

13. A transmission comprising:

an input member;

an output member;

a first, second, and third planetary gear set each having a first, second, and third member, wherein the input member is continuously interconnected with the second member of the first planetary gear set;

a first, second, third, and fourth co-planar gear set each having a first gear intermeshed with a second gear, wherein the output member is continuously interconnected with the second gear of the fourth co-planar gear set;

a first interconnecting member continuously interconnecting the second gear of the first co-planar gear set with the first member of the first planetary gear set;

a second interconnecting member continuously interconnecting the third member of the first planetary gear set with the first gear of the second co-planar gear set;

a third interconnecting member continuously interconnecting the first gear of the third co-planar gear set with the third member of the second planetary gear set and the first member of the third planetary gear set;

a fourth interconnecting member continuously interconnecting the first member of the second planetary gear set with the second gear of the second co-planar gear set;

a fifth interconnecting member continuously interconnecting the second member of the third planetary gear set with the first gear of the fourth co-planar gear set;

a first torque transmitting mechanism selectively engageable to interconnect the second gear of the third co-planar gear set with at least one of the second member of the first planetary gear set and the input member;

a second torque transmitting mechanism selectively engageable to interconnect at least one of the third member of the first planetary gear set and the first gear of the second co-planar gear set with the second gear of the third co-planar gear set;

a third torque transmitting mechanism selectively engageable to interconnect the first gear of the first co-planar gear set with the third member of the third planetary gear set;

a fourth torque transmitting mechanism selectively engageable to interconnect the third member of the third planetary gear set with the second member of the second planetary gear set;

a fifth torque transmitting mechanism selectively engageable to interconnect at least one of the second gear of the first co-planar gear set and the first member of the first planetary gear set with a stationary element, and

wherein the torque transmitting mechanisms are selectively engageable in combinations of at least three to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member.

14. The transmission of claim 13 wherein the first members are sun gears, the second members are carrier members, and the third members are ring gears.

15. The transmission of claim 13 wherein the first gears and the second gears within each of the first, second, third, and fourth co-planar gear sets are co-planar.

16. The transmission of claim 13 wherein the input member, the first and second interconnecting members, and the first planetary gear set are co-axial and wherein the third, fourth, and fifth interconnecting members, the second planetary gear set, and the third planetary gear set are co-axial.

17. The transmission of claim 13 wherein the output member is offset from the first, second, third, fourth, and fifth interconnecting members and the input member.

18. The transmission of claim 13 wherein the stationary element is a transmission housing.

19. A transmission comprising:

an input member;

an output member;

a first, second, and third planetary gear set each having a sun gear, a carrier member, and a ring gear, wherein the input member is continuously interconnected with the carrier member of the first planetary gear set;

a first, second, third, and fourth co-planar gear set each having a first gear intermeshed with a second gear, wherein the output member is continuously interconnected with the second gear of the fourth co-planar gear set;

a first interconnecting member continuously interconnecting the second gear of the first co-planar gear set with the sun gear of the first planetary gear set;

a second interconnecting member continuously interconnecting the ring gear of the first planetary gear set with the first gear of the second co-planar gear set;

a third interconnecting member continuously interconnecting the first gear of the third co-planar gear set with the ring gear of the second planetary gear set and the sun gear of the third planetary gear set;

a fourth interconnecting member continuously interconnecting the sun gear of the second planetary gear set with the second gear of the second co-planar gear set;

a fifth interconnecting member continuously interconnecting the carrier member of the third planetary gear set with the first gear of the fourth co-planar gear set;

a first torque transmitting mechanism selectively engageable to interconnect the second gear of the third co-planar gear set with at least one of the carrier member of the first planetary gear set and the input member;

a second torque transmitting mechanism selectively engageable to interconnect at least one of the ring gear of the first planetary gear set and the first gear of the second co-planar gear set with the second gear of the third co-planar gear set;

a third torque transmitting mechanism selectively engageable to interconnect the first gear of the first co-planar gear set with the ring gear of the third planetary gear set;

a fourth torque transmitting mechanism selectively engageable to interconnect the ring gear of the third planetary gear set with the carrier member of the second planetary gear set;

a fifth torque transmitting mechanism selectively engageable to interconnect at least one of the second gear of the first co-planar gear set and the sun gear of the first planetary gear set with a stationary element, and

wherein the torque transmitting mechanisms are selectively engageable in combinations of at least three to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member.

20. The transmission of claim 19 wherein the first gears and the second gears within each of the first, second, third, and fourth co-planar gear sets are co-planar.

21. The transmission of claim 20 wherein the input member, the first and second interconnecting members, and the first planetary gear set are co-axial and wherein the third, fourth, and fifth interconnecting members, the second planetary gear set, and the third planetary gear set are co-axial.

22. The transmission of claim 21 wherein the output member is offset from the first, second, third, fourth, and fifth interconnecting members and the input member.

23. The transmission of claim 22 wherein the stationary element is a transmission housing.