US 2010/0248889 A1Published application

8-speed hybrid transmission

AssigneeGM Global Technology Operations LLC

InventorsScott H. Wittkopp, James M. Hart, James B. Borgerson

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Abstract

The hybrid transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The hybrid transmission includes a motor/generator, three planetary gear sets, five torque-transmitting devices, three external gear sets and a final drive gear set. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with one of the external gear sets. The five torque-transmitting devices provide interconnections between various planetary and external gear members, the input shaft, and the transmission housing, and are operated in combinations of three to establish eight forward speed ratios and one reverse speed ratio.

Claims11

Dependent claims

A multi-speed hybrid transmission comprising:

an input member;
an output member;
first, second and third planetary gear sets each having first, second and third members, said planetary gear sets being positioned along first and second axes;
first, second and third external gear sets positioned for transferring torque between said first and second axes, said first, second and third external gear sets each including first and second intermeshed external gears;
a motor/generator operatively connected with said first external gear of said second external gear set;
a first torque-transmitting device selectively connecting said first member of said first planetary gear set with a stationary member;
a second torque-transmitting device selectively connecting said first external gear of said third external gear set with said input member;
a third torque-transmitting device selectively connecting said third member of said second planetary gear set with said third member of said third planetary gear set;
a fourth torque-transmitting device selectively connecting said first external gear of said second external gear set with said first external gear of said third external gear set;
a fifth torque-transmitting device selectively connecting said second external gear of said first external gear set with said third member of said third planetary gear set;
and
said five torque-transmitting devices being engaged in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio between said input member and said output member.

9 more elements

A multi-speed transmission comprising:

an input member;
an output member;
first, second and third planetary gear sets each having a sun gear member, a planet carrier assembly member and a ring gear member, said planetary gear sets being positioned along first and second axes;
first, second and third external gear sets positioned for transferring torque between said first and second axes, said first, second and third external gear sets each including first and second intermeshed external gears;
a motor/generator operatively connected with said first external gear of said second external gear set;
a first torque-transmitting device selectively connecting said sun gear member of said first planetary gear set with a stationary member;
a second torque-transmitting device selectively connecting said first external gear of said third external gear set with said input member;
a third torque-transmitting device selectively connecting said ring gear member of said second planetary gear set with said ring gear member of said third planetary gear set;
a fourth torque-transmitting device selectively connecting said first external gear of said second external gear set with said first external gear of said third external gear set;
a fifth torque-transmitting device selectively connecting said second external gear of said first external gear set with said ring gear member of said third planetary gear set;
and
said five torque-transmitting devices being engaged in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio between said input member and said output member.

9 more elements

A multi-speed transmission comprising:

an input member;
an output member;
first, second and third planetary gear sets each having a sun gear member, a planet carrier assembly member and a ring gear member, said planetary gear sets being positioned along first and second axes;
first, second and third external gear sets positioned for transferring torque between said first and second axes, said first, second and third external gear sets each including first and second intermeshed external gears;
a motor/generator operatively connected with said first external gear of said second external gear set;
said sun gear member of said first planetary gear set is continuously connected with said first external gear of said first external gear set;
said ring gear member of said first planetary gear set is continuously connected with said first external gear of said second external gear set;
said sun gear member of said second planetary gear set is continuously connected with said second external gear of said second external gear set;
said sun gear member of said third planetary gear set is continuously connected with said second external gear of said third external gear set;
said planet carrier assembly member of said second planetary gear set is continuously connected with said second external gear of said third external gear set;
and said planet carrier assembly member of said third planetary gear set is continuously connected with an external drive gear of a final drive external set;
a first torque-transmitting device selectively connecting said sun gear member of said first planetary gear set with a stationary member;
a second torque-transmitting device selectively connecting said first external gear of said third external gear set with said input member;
a third torque-transmitting device selectively connecting said ring gear member of said second planetary gear set with said ring gear member of said third planetary gear set;
a fourth torque-transmitting device selectively connecting said first external gear of said second external gear set with said first external gear of said third external gear set;
a fifth torque-transmitting device selectively connecting said second external gear of said first external gear set with said ring gear member of said third planetary gear set;
and
said five torque-transmitting devices being engaged in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio between said input member and said output member.

15 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/410,510Filed 25 Mar 2009
Published: 30 Sep 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B60K 6/48
Characterised by the architecture of the hybrid electric vehicle: parallel type
B60K 6/365
Characterised by the transmission gearings: with the gears having orbital motion
F16H 3/725
Using externally powered electric machines: with means to change ratio in the mechanical gearing
B60K 2006/4833
Parallel type: step up or reduction gearing driving generator, e.g. to operate generator in most efficient speed range

Family

US 8,226,512 B2Related patent
US 2010/0248889 A1This patent

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

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