IP Library › Granted Patent US 8,602,937
Granted Patent B2
US 8,602,937 · App. 13/769,649 · Granted Dec 10, 2013

Multi-speed transmission having three planetary gear sets

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Quick Facts
Patent No.
US 8,602,937
App. No.
13/769,649
Granted
Dec 10, 2013
Kind
B2
Abstract

A transmission includes an input member, an output member, three planetary 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. The torque transmitting devices include clutches and brakes.

Claims (47)

1. A transmission comprising:

an input member;

an output member;

first, second and third planetary gear sets each having first, second and third members, wherein the input member is continuously interconnected to the first member of the first planetary gear set and the output member is continuously interconnected to the third member of the third planetary gear set;

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

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

a third interconnecting member continuously interconnecting the third member of the first planetary gear set with the first member of the third planetary gear set; and

five torque transmitting mechanisms each selectively engageable to interconnect at least one of the first, second and third members of the first, second and third planetary gear sets with at least one other of the first, second, third members and a stationary member, and

wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least six forward speed ratios and at least one reverse speed ratio between the input member and the output member, the second planetary gear set includes a first and a second set of pinions each rotatably supported by the first member, the first set of pinions meshes with each of the second set of pinions and the second member, and the second set of pinions meshes with each of the first set of pinions and the third member.

2. The transmission of claim 1 wherein a first of the five torque transmitting mechanisms is selectively engageable to interconnect the first member of the first planetary gear set with the second member of the third planetary gear set.

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

4. The transmission of claim 3 wherein a third of the five torque transmitting mechanisms is selectively engageable to interconnect the third member of the first planetary gear set, the first member of the third planetary gear set, and the second member of the second planetary gear set with the stationary member.

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 second planetary gear set with the stationary member.

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

7. The transmission of claim 6 wherein the first member of the first planetary gear set, the third member of the second planetary gear set, and the first member of the third planetary gear set are sun gears, the first and second planetary gear sets include a carrier member that includes the second member of the first planetary gear set, the first member of the second planetary gear set, and the first interconnecting member, and the first planetary gear set includes a ring gear that includes the third member of the first planetary gear set, the first member of the second planetary gear set, and the second interconnecting member, the second member of the third planetary gear set is a carrier member, and the third member of the third planetary gear set is a ring gear.

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

9. A transmission comprising:

an input member;

an output member;

first, second and third planetary gear sets each having first, second and third members, wherein the input member is continuously interconnected to the first member of the first planetary gear set and the output member is continuously interconnected to the third member of the third planetary gear set;

three interconnecting members each selectively engageable to interconnect one of the first, second and third members of the first, second and third planetary gear sets with one other of the first, second, third members of the first, second and third planetary gear sets;

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

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

a third torque transmitting mechanism selectively engageable to interconnect at least one of the second interconnecting member and the third interconnecting member with a stationary member;

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

a fifth torque transmitting mechanism selectively engageable to interconnect the second member of the third planetary gear set with the stationary member, and

wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least six forward speed ratios and at least one reverse speed ratio between the input member and the output member, the second planetary gear set includes a first and a second set of pinions each rotatably supported by the first member, the first set of pinions meshes with each of the second set of pinions and the second member, and the second set of pinions meshes with each of the first set of pinions and the third member.

10. The transmission of claim 9 wherein a first of the three interconnecting members continuously interconnect the second member of the first planetary gear set with the first member of the second planetary gear set.

11. The transmission of claim 10 wherein a second of the three interconnecting members continuously interconnects the third member of the first planetary gear set with the second member of the second planetary gear set.

12. The transmission of claim 11 wherein a third of the three interconnecting members continuously interconnects the third member of the first planetary gear set with the first member of the third planetary gear set.

13. The transmission of claim 12 wherein the first member of the first planetary gear set, the third member of the second planetary gear set and the first member of the third planetary gear set are sun gears, the first and second planetary gear sets include a carrier member that includes the second member of the first planetary gear set, the first member of the second planetary gear set, and the first interconnecting member, and the first planetary gear set includes a ring gear that includes the third member of the first planetary gear set, the first member of the second planetary gear set, and the second interconnecting member, the second member of the third planetary gear set is a carrier member, and the third member of the third planetary gear set is a ring gear.

14. The transmission of claim 9 wherein the first member of the first planetary gear set, the third member of the second planetary gear set and the first member of the third planetary gear set are sun gears, the second member of the first planetary gear set, the first member of the second planetary gear set, and the second member of the third planetary gear set are carrier members, and the third member of the first planetary gear set, the second member of the second planetary gear set, and the third member of the third planetary gear set are ring gears.

15. A transmission comprising:

an input member;

an output member;

first, second and third planetary gear sets each having first, second and third members, wherein the input member is continuously interconnected to the first member of the first planetary gear set and the output member is continuously interconnected to the third member of the third planetary gear set;

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

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

a third interconnecting member continuously interconnecting the third member of the first planetary gear set with the first member of the third planetary gear set;

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

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

a third torque transmitting mechanism selectively engageable to interconnect at least one of the second interconnecting member and the third interconnecting member with the stationary member;

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

a fifth torque transmitting mechanism selectively engageable to interconnect the second member of the third planetary gear set with the stationary member, and

wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish at least six forward speed ratios and at least one reverse speed ratio between the input member and the output member, the second planetary gear set includes a first and a second set of pinions each rotatably supported by the first member, the first set of pinions meshes with each of the second set of pinions and the second member, and the second set of pinions meshes with each of the first set of pinions and the third member.

16. The transmission of claim 15 wherein the first member of the first planetary gear set, the third member of the second planetary gear set, and the first member of the third planetary gear set are sun gears, the first and second planetary gear sets include a carrier member that includes the second member of the first planetary gear set, the first member of the second planetary gear set, and the first interconnecting member, and the first planetary gear set includes a ring gear that includes the third member of the first planetary gear set, the first member of the second planetary gear set, and the second interconnecting member, the second member of the third planetary gear set is a carrier member, and the third member of the third planetary gear set is a ring gear.

17. The transmission of claim 15 wherein the first member of the first planetary gear set, the third member of the second planetary gear set and the first member of the third planetary gear set are sun gears, the second member of the first planetary gear set, the first member of the second planetary gear set, and the second member of the third planetary gear set are carrier members, and the third member of the first planetary gear set, the second member of the second planetary gear set, and the third member of the third planetary gear set are ring gears.

Assignments (2)
RELEASE OF SECURITY INTEREST Recorded Nov 7, 2014
From: WILMINGTON TRUST COMPANY
To: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Reel/Frame 034287/0601 →
SECURITY INTEREST Recorded Jun 12, 2014
From: GM GLOBAL TECHNOLOGY OPERATIONS LLC
To: WILMINGTON TRUST COMPANY
Reel/Frame 033135/0336 →