US 2011/0034294 A1Published application

Multi-speed transmission

AssigneeGM Global Technology Operations LLC

InventorsAndrew W. Phillips, Craig S. Ross, Scott H. Wittkopp, James M. Hart, Clinton E. Carey

Life of this patent

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Abstract

A transmission is disclosed having an input member, an output member, first, second and third planetary gear sets, a first interconnecting member, a second interconnecting member and six torque-transmitting mechanisms. 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. The planetary gear sets each have first, second and third members. The six torque-transmitting mechanisms are selectively engageable to interconnect one of the first, second, and third members with another of the first, second, and third members.

Claims22

Dependent claims

A transmission comprising:

an input member;
an output member;
a first planetary gear set including first, second, third, and fourth members;
a second planetary gear set including first, second, and third members;
a third planetary gear set including first, second, and third members;
a first torque transmitting mechanism selectively engageable to interconnect the fourth member of the first planetary gear set with at least one of the input member and the first member of the second gear set;
a second torque transmitting mechanism selectively engageable to interconnect the third member of the second planetary gear set with at least one of the first member of the second planetary gear set and the input member;
a third torque transmitting mechanism selectively engageable to interconnect the second member of the first planetary gear set with the first member of the third planetary gear set;
a fourth torque transmitting mechanism selectively engageable to interconnect the third member of the first planetary gear set with the first member of the third planetary gear set;
a fifth torque transmitting mechanism selectively engageable to interconnect the second member of the first planetary gear set with the third member of the second planetary gear set;
and
a sixth torque transmitting mechanism selectively engageable to interconnect the second member of the third planetary gear set with a stationary member,
wherein the torque transmitting mechanisms are selectively engageable to establish each of at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member, and
wherein at least two torque transmitting mechanisms are disengaged in each of the at least eight forward speed ratios and the at least one reverse speed ratio.

11 more elements

A transmission comprising:

an input member;
an output member;
a first planetary gear set having a sun member, a first ring member, a second ring member, and a carrier member;
a second planetary gear set having a sun member, a ring member, and a carrier member, wherein the input member is continuously interconnected with the sun member of the second planetary gear set;
a third planetary gear set having a sun member, a ring member and a carrier member, wherein the output member is continuously interconnected with the ring member of the third planetary gear set;
at least two continuous interconnections from at least one of the sun members, the carrier members, the ring members, and a stationary member to at least one other of the sun members, the ring members, and the carrier members;
a first torque transmitting mechanism selectively engageable to interconnect the second ring member of the first planetary gear set with at least one of the input member and the sun member of the second gear set;
a second torque transmitting mechanism selectively engageable to interconnect the ring member of the second planetary gear set with at least one of the sun member of the second planetary gear set and the input member;
a third torque transmitting mechanism selectively engageable to interconnect the carrier member of the first planetary gear set with the sun member of the third planetary gear set;
a fourth torque transmitting mechanism selectively engageable to interconnect the first ring member of the first planetary gear set with the sun member of the third planetary gear set;
a fifth torque transmitting mechanism selectively engageable to interconnect the carrier member of the first planetary gear set with the ring member of the second planetary gear set;
and
a sixth torque transmitting mechanism selectively engageable to interconnect the carrier member of the third planetary gear set with the stationary member,
wherein the torque transmitting mechanisms are selectively engageable to establish each of at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member, and
wherein at least two torque transmitting mechanisms are disengaged in each of the at least eight forward speed ratios and the at least one reverse speed ratio.

12 more elements

A transmission comprising:

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

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/898,356Filed 5 Oct 2010
Priority: 21 Nov 2006
Published: 10 Feb 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F16H 3/666
Composed of a number of gear trains without drive passing from one train to another: with intermeshing orbital gears
F16H 3/663
Composed of a number of gear trains without drive passing from one train to another: with conveying rotary motion between axially spaced orbital…
F16H 2200/006
Characterised by the number of forward speeds: the gear ratios comprising eight forward speeds
F16H 2200/0086
Characterised by the number of reverse speeds: the gear ratios comprising two reverse speeds

Family

Application60/866,702Us provisional application · filed 21 Nov 2006
Application11/873,760Continuation · filed 17 Oct 2007
Application12/898,356Continuation
US 2008/0119318 A1Published application
US 7,824,304 B2Related patent
US 7,927,249 B2Related patent
US 2011/0034294 A1This patent

From the US filing history. Foreign family members aren’t listed.