Back to results
US 7,604,564 B2Granted
Seven speed transmission with six torque-transmitting mechanisms and three planetary gear sets
AssigneeGM Global Technology Operations LLC
InventorDonald Klemen
Life of this patent
Estimating the term…
Abstract
A multi-speed transmission is provided that includes three planetary gear sets and seven torque-transmitting mechanisms with various fixed interconnections to provide seven forward speed ratios and one reverse speed ratio. The first planetary gear set is a dual sun planetary and the torque-transmitting mechanism engagement schedule is designed so that, in the reverse speed ratio, a predetermined speed ratio is achieved at the second sun gear member in the dual sun planetary and the input member, and, in the first forward speed ratio, the same magnitude predetermined speed ratio is achieved between the second sun gear member and the input member, but with the second sun gear member rotating in an opposite direction as in the reverse speed ratio.
Claims20
A multi-speed transmission comprising:
- an input member;
- an output member;
- a first planetary gear set having:
- a first sun gear member;
- a second sun gear member;
- a first and a second set of pinion gear members rotatably supported on a carrier member, said first set of pinion gear members continuously intermeshing with said first sun gear member and said second set of pinion gear members, said second set of pinion gear members also continuously intermeshing with said second sun gear member;
- a second and a third planetary gear set each having first, second and third members, and having at least one continuous interconnection therebetween, said second sun gear member being continuously interconnected with a first member of said second planetary gear set;
- wherein said output member is continuously interconnected with a first member of said third planetary gear set;
- wherein said input member is continuously interconnected with said first sun gear member;
- a first torque-transmitting mechanism selectively engageable to connect said input member with said carrier member;
- a second torque-transmitting mechanism selectively engageable to connect said carrier member with a stationary member;
- wherein said first torque-transmitting mechanism is engaged to establish a first predetermined speed ratio between said second sun gear member and said input member in a first direction of rotation;
- and
- wherein said second torque-transmitting mechanism is engaged to establish said first predetermined speed ratio between said second sun gear member and said input member in a second direction of rotation opposite said first direction of rotation.
11 more elements
A multi-speed transmission comprising:
- an input member;
- an output member;
- first, second and third planetary gear sets, said first planetary gear set including:
- first and second sun gear members;
- first and second sets of pinion gear members rotatably supported on a carrier member, said first set of pinion gear members continuously intermeshing with said first sun gear member and said second set of pinion gear members, said second set of pinion gear members also continuously intermeshing with said second sun gear member;
- wherein said second and third planetary gear sets each include a first, a second and a third member;
- a first interconnecting member continuously interconnecting said second member of said second planetary gear set with said second member of said third planetary gear set;
- a second interconnecting member continuously interconnecting said third member of said second planetary gear set with said third member of said third planetary gear set;
- a third interconnecting member continuously interconnecting said second sun gear member with said first member of said second planetary gear set;
- said input member being continuously interconnected with said first sun gear member and said output member being continuously interconnected with said first member of said third planetary gear set;
- and
- six torque-transmitting mechanisms operable for selectively interconnecting selected ones of said members of said planetary gear sets with said input member, with a stationary member or with other ones of said members of said planetary gear sets to establish at least seven forward speed ratios and a 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;
- a first planetary gear set having:
- a first sun gear member;
- a second sun gear member;
- a first and a second set of pinion gear members rotatably supported on a carrier member, said first set of pinion gear members continuously intermeshing with said first sun gear member and said second set of pinion gear members, said second set of pinion gear members also continuously intermeshing with said second sun gear member;
- a second and a third planetary gear set each having first, second and third members, and having a first interconnecting member therebetween, said second sun gear member being continuously interconnected with a first member of said second planetary gear set;
- wherein said output member is continuously interconnected with a first member of said third planetary gear set;
- wherein said input member is continuously interconnected with said first sun gear member;
- a first torque-transmitting mechanism selectively engageable to connect said input member with said carrier member;
- a second torque-transmitting mechanism selectively engageable to connect said carrier member with a stationary member;
- wherein said first torque-transmitting mechanism is engaged to establish a first predetermined speed ratio between said second sun gear member and said input member in a first direction of rotation;
- wherein said second torque-transmitting mechanism is engaged to establish said first predetermined speed ratio between said second sun gear member and said input member in a second direction of rotation opposite said first direction of rotation;
- a third torque-transmitting mechanism selectively engageable to selectively connect said first interconnecting member to said stationary member;
- and
- wherein engagement of said first and third torque-transmitting mechanisms establishes a reverse speed ratio between said input member and said output member.
13 more elements
Dependencies are inferred from the claim text.