US 8,007,393 B2Granted

Multi-speed transmission

AssigneeGM Global Technology Operations LLC

InventorsScott H. Wittkopp, Andrew W. Phillips, James M. Hart, Clinton E. Carey, Madhusudan Raghavan

Life of this patent

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Abstract

A transmission is provided having an input member, an output member, first, second, and third planetary gear sets each having first, second and third members. The input member is continuously interconnected to the third member of the third planetary gear set and the output member is continuously interconnected to the third member of the first planetary gear set. The transmission further includes six torque transmitting mechanisms selectively engageable to interconnect one of the first, second, and third members with at least one other of the first, second, third members, and a stationary element. 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.

Claims7

Dependent claims

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 third member of the third planetary gear set and the output member is continuously interconnected to the third member of the first planetary gear set;
a first interconnecting member continuously interconnecting the second member of the first planetary gear set with the second member of the second planetary gear set;
a second interconnecting member continuously interconnecting the third member of the first planetary gear set with the third member of the second planetary gear set;
six torque transmitting mechanisms each selectively engageable to interconnect 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 element, wherein a first of the six torque transmitting mechanisms is selectively engageable to directly interconnect the first member of the second planetary gear set with the first member of the third planetary gear set, a second of the six torque transmitting mechanisms is selectively engageable to directly interconnect the first member of the second planetary gear set with the second member of the third planetary gear set, a third of the six torque transmitting mechanisms is selectively engageable to directly interconnect the first member of the first planetary gear set with the second member of the third planetary gear set, a fourth of the six torque transmitting mechanisms is selectively engageable to directly interconnect the second member of the first planetary gear set with the input member, and a fifth of the six torque transmitting mechanisms is selectively engageable to directly interconnect the first member of the third planetary clear set with the stationary element;
and
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.

5 more elements

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 third member of the third planetary gear set and the output member is continuously interconnected to the third member of the first planetary gear set;
a first interconnecting member continuously interconnecting the second member of the first planetary gear set with the second member of the second planetary gear set;
a second interconnecting member continuously interconnecting the third member of the first planetary gear set with the third member of the second planetary gear set;
a first torque transmitting mechanism selectively engageable to directly interconnect the first member of the second planetary gear set with the first member of the third planetary gear set;
a second torque transmitting mechanism selectively engageable to directly interconnect the first member of the second planetary gear set with the second member of the third planetary gear set;
a third torque transmitting mechanism selectively engageable to directly interconnect the first member of the first planetary gear set with the second member of the third planetary gear set;
a fourth torque transmitting mechanism selectively engageable to directly interconnect the second member of the first planetary gear set with the input member;
a fifth torque transmitting mechanism selectively engageable to directly interconnect the first member of the third planetary gear set with the stationary element;
and
a sixth torque transmitting mechanism selectively engageable to directly interconnect the second member of the second planetary gear set with the 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.

10 more elements

A transmission comprising:

an input member;
an output member;
first, second, and third planetary gear sets each having a sun gear member, a carrier member, and a ring gear member, wherein the input member is continuously interconnected to the ring gear member of the third planetary gear set and the output member is continuously interconnected to the ring gear member of the first planetary gear set;
a first interconnecting member continuously interconnecting the carrier member of the first planetary gear set with the carrier member of the second planetary gear set;
a second interconnecting member continuously interconnecting the ring gear member of the first planetary gear set with the ring gear member of the second planetary gear set;
a first torque transmitting mechanism selectively engageable to interconnect the sun gear member of the second planetary gear set with the sun gear member of the third planetary gear set;
a second torque transmitting mechanism selectively engageable to interconnect the sun gear member of the second planetary gear set with the carrier member of the third planetary gear set;
a third torque transmitting mechanism selectively engageable to interconnect the sun gear member of the first planetary gear set with the carrier member of the third planetary gear set;
a fourth torque transmitting mechanism selectively engageable to interconnect the carrier member of the first planetary gear set with the input member;
a fifth torque transmitting mechanism selectively engageable to interconnect the sun gear member of the third planetary gear set with the stationary element;
and
a sixth torque transmitting mechanism selectively engageable to interconnect the carrier member of the second planetary gear set with the 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.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/939,317Filed 13 Nov 2007 · us provisional application
Priority: 4 Dec 2006
Published: US 2008/0153654 A126 Jun 2008
Granted: 30 Aug 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F16H 3/666
Composed of a number of gear trains without drive passing from one train to another: with intermeshing orbital gears
F16H 2200/006
Characterised by the number of forward speeds: the gear ratios comprising eight forward speeds
F16H 2200/201
Characterised by the number of sets of orbital gears: with three sets of orbital gears
F16H 2200/2046
Characterised by the engaging friction means not of the freewheel type, e.g. friction clutches or brakes: with six engaging means