Transmission with friction launch mechanism
First Claim
1. A power transmission for use in a powertrain having an engine for providing rotary power in a first direction to said power transmission, said power transmission comprising;
- an input shaft continuously drivingly connected with the engine for rotation therewith;
an output shaft;
a first planetary gearset having a plurality of planetary gear members, said first planetary gearset being operably coupled with said input shaft;
a second planetary gearset having a plurality of planetary gear members, said second planetary gearset being drivingly interconnected with said output shaft;
a third planetary gearset having a plurality of planetary gear members, one of said gear members of said third planetary gearset being drivingly interconnected with one of said members of said first planetary gearset, another one of said gear members of said third planetary gearset being drivingly interconnected with one of said gear members of said second planetary gearset;
a first torque transmitting mechanism for selectively braking rotation of one of said gear members of said second planetary gearset to provide a forward launch ratio;
a second torque transmitting mechanism selectively operable to engage said third planetary gearset with said input shaft to provide a reverse launch ratio; and
a third torque transmitting mechanism for selectively braking rotation of one of said planetary gear members of said third planetary gearset to serve as a reaction member in said forward launch ratio wherein said third torque transmitting mechanism includes a one-way clutch and a plate clutch, both clutches being positioned in series between said one of said planetary gear members of said third planetary gearset and a brake reaction member.
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Accused Products
Abstract
A powertrain includes a power transmission having an input shaft continuously connected directly between an engine and a planetary gear member of a first planetary gearset. Another member of the planetary gearset is selectively grounded by a torque transmitting mechanism to establish a reaction member during the launch of a vehicle incorporating the powertrain. The reaction member is established during both the lowest forward drive ratio and the reverse drive ratio. A third member of the planetary gearset transmits the torque from the input shaft, as modified by the planetary gearset, to other planetary gearsets in down stream power flow arrangement with the first planetary gearset.
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Citations
32 Claims
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1. A power transmission for use in a powertrain having an engine for providing rotary power in a first direction to said power transmission, said power transmission comprising;
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an input shaft continuously drivingly connected with the engine for rotation therewith; an output shaft; a first planetary gearset having a plurality of planetary gear members, said first planetary gearset being operably coupled with said input shaft; a second planetary gearset having a plurality of planetary gear members, said second planetary gearset being drivingly interconnected with said output shaft; a third planetary gearset having a plurality of planetary gear members, one of said gear members of said third planetary gearset being drivingly interconnected with one of said members of said first planetary gearset, another one of said gear members of said third planetary gearset being drivingly interconnected with one of said gear members of said second planetary gearset; a first torque transmitting mechanism for selectively braking rotation of one of said gear members of said second planetary gearset to provide a forward launch ratio; a second torque transmitting mechanism selectively operable to engage said third planetary gearset with said input shaft to provide a reverse launch ratio; and a third torque transmitting mechanism for selectively braking rotation of one of said planetary gear members of said third planetary gearset to serve as a reaction member in said forward launch ratio wherein said third torque transmitting mechanism includes a one-way clutch and a plate clutch, both clutches being positioned in series between said one of said planetary gear members of said third planetary gearset and a brake reaction member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A power transmission for use in a powertrain having an engine for providing rotary power to the transmission, said transmission comprising:
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an input shaft continuously connected with the engine for rotation therewith; a first planetary gearset having a first member driven by said input shaft, a second member, and a third member; a second planetary gearset having a third member driven by said second member of said first planetary gearset, a second member driving an output shaft, and a first member; a third planetary gearset having a third member driven by said second member of said second planetary gearset, a second member driven by said third member of said first planetary gearset and a first member; a first torque transmitting mechanism that is operable to selectively engage said first member of said third planetary gearset for rotation with said input shaft; a second torque transmitting mechanism that is selectively operable to engage said third member of said first planetary gearset for rotation with said input shaft; a third torque transmitting mechanism for selectively braking rotation of said first member of said third planetary gearset; a fourth torque transmitting mechanism for selectively braking rotation of said second member of said third planetary gearset, said fourth torque transmitting mechanism including a one-way clutch and a plate clutch, both clutches being positioned in series between said second member of said third planetary gearset and a brake reaction member; and a fifth torque transmitting mechanism for selectively braking rotation of said first member of said second planetary gearset. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification