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US 7,396,312 B2Granted
Six speed transmission with a single carrier
AssigneeGeneral Motors Corporation
InventorsDonald Klemen, Robert K. Dunlap
Life of this patent
Estimating the term…
Abstract
A six speed transmission is provided that includes three planetary gear sets having a common carrier member and six torque-transmitting mechanisms operated in combinations of two to provide at least six forward speed ratios and two reverse speed ratios. A method of assembling a transmission is also provided. A reduction in components and component standardization is achieved.
Claims16
A multi-speed transmission comprising:
- an input shaft;
- an output shaft;
- first, second and third planetary gear sets having a common carrier member, at least two ring gear members, and each having a sun gear member;
- a plurality of sets of pinion gears rotatably mounted on said common carrier member intermeshing with said ring gear members and said sun gear members;
- said input shaft not being continuously connected with any member of said planetary gear sets and said output shaft being continuously connected with a member of said planetary gear sets;
- and
- six torque-transmitting mechanisms operable for selectively interconnecting said members of said planetary gear sets with said input shaft, with a stationary member or with other members of said planetary gear sets, said six torque-transmitting mechanisms being engaged in combinations of two to establish at least six forward speed ratios and two reverse speed ratios between said input shaft and said output shaft.
4 more elements
A multi-speed transmission comprising:
- an input shaft;
- an output shaft;
- first, second and third planetary gear sets having a common carrier member, each having a sun gear member, said first and second planetary gear sets having at least one ring gear member and said third planetary gear set having another ring gear member, said sun gear member of said second planetary gear set being continuously connected with said sun gear member of said third planetary gear set;
- said input shaft not being continuously connected with any member of said planetary gear sets and said output shaft being continuously connected with said ring gear member of said third planetary gear set;
- a first torque-transmitting mechanism operable for selectively interconnecting said sun gear member of said second planetary gear set with said input shaft;
- a second torque-transmitting mechanism operable for selectively interconnecting said common carrier member with said input shaft;
- a third torque-transmitting mechanism operable for selectively interconnecting said sun gear member of said first planetary gear set with said input shaft;
- a fourth torque-transmitting mechanism operable for selectively interconnecting said sun gear member of said first planetary gear set with said stationary member;
- a fifth torque-transmitting mechanism operable for selectively interconnecting said at least one ring gear member of said first and second planetary gear sets with said stationary member;
- a sixth torque-transmitting mechanism for selectively interconnecting said common carrier member with said stationary member;
- and
- said six torque-transmitting mechanisms being operable in combinations of two to provide six forward speed ratios and two reverse speed ratios.
9 more elements
Dependencies are inferred from the claim text.