Transmission
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 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 continuously connected 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, said third planetary gearset being drivingly interconnected with said output shaft;
a first torque transmitting mechanism selectively operable to engage said first planetary gearset with said second planetary gearset to provide a forward drive ratio;
a second torque transmitting mechanism selectively operable to engage said first planetary gearset with said third planetary gearset to provide a reverse drive ratio; and
a third torque transmitting mechanism for selectively braking rotation of at least one of said planetary gear members of said second planetary gearset and said third planetary gearset to serve as a reaction member in both said forward drive ratio and said reverse drive ratio.
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0 Petitions
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
21 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 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 continuously connected 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, said third planetary gearset being drivingly interconnected with said output shaft;
a first torque transmitting mechanism selectively operable to engage said first planetary gearset with said second planetary gearset to provide a forward drive ratio;
a second torque transmitting mechanism selectively operable to engage said first planetary gearset with said third planetary gearset to provide a reverse drive ratio; and
a third torque transmitting mechanism for selectively braking rotation of at least one of said planetary gear members of said second planetary gearset and said third planetary gearset to serve as a reaction member in both said forward drive ratio and said reverse drive ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
a fourth torque transmitting mechanism selectively operable to engage said second planetary gearset for rotation with said input shaft; and
a fifth torque transmitting mechanism for selectively braking rotation of said third planetary gearset.
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3. The power transmission according to claim 1 wherein said third torque transmitting mechanism is a multi-plate clutch mechanism.
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4. The power transmission according to claim 1 wherein said third torque transmitting mechanism is a band-type brake assembly.
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5. The power transmission according to claim 1 wherein said first planetary gearset, said second planetary gearset, and said third planetary gearset each includes a first member, a second member, and a third member.
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6. The power transmission according to claim 5 wherein said second member of said second planetary gearset includes a meshed pair of pinion gears.
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7. The power transmission according to claim 5, further comprising a housing, and wherein said third member of said first planetary gearset is fixedly coupled to said housing.
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8. The power transmission according to claim 5 wherein said third member of said second planetary gearset and said third member of said third planetary gearset are formed as a single unitary member.
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9. The power transmission according to claim 8, wherein said single unitary member is a ring gear.
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10. 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 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 continuously connected 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, said third planetary gearset being drivingly interconnected with said output shaft;
a first torque transmitting mechanism selectively operable to engage said first planetary gearset with said second planetary gearset to provide a forward drive ratio;
a second torque transmitting mechanism selectively operable to engage said first planetary gearset with said third planetary gearset to provide a reverse drive ratio;
a third torque transmitting mechanism for selectively braking rotation of at least one of said planetary gear members of said second planetary gearset and said third planetary gearset to serve as a reaction member in both said forward drive ratio and said reverse drive ratio;
a fourth torque transmitting mechanism selectively operable to engage said second planetary gearset for rotation with said input shaft; and
a fifth torque transmitting mechanism for selectively braking rotation of said third planetary gearset. - View Dependent Claims (11)
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12. 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 connected with the engine for rotation therewith;
an output shaft;
a first planetary gearset having a first member continuously drivingly connected with said input shaft, a second member and a third member;
a second planetary gearset having a first member drivingly interconnected with said output shaft, a second member and a third member;
a third planetary gearset having a first member drivingly interconnected with said output shaft;
a first torque transmitting mechanism selectively operable to engage said second member of said first planetary gearset with said third member of said second planetary gearset to provide a first forward launch ratio;
a second torque transmitting mechanism selectively operable to engage said second member of said first planetary gearset with said third member of said third planetary gearset to provide a reverse launch ratio; and
a third torque transmitting mechanism for selectively braking rotation of at least one of said second member of said second planetary gearset and said second member of said third planetary gearset to serve as a reaction member in both said first forward launch ratio and said reverse launch ratio. - View Dependent Claims (13, 14, 15, 16, 17, 18)
a fourth torque transmitting mechanism selectively operable to engage said second member of said second planetary gearset for rotation with said input shaft; and
a fifth torque transmitting mechanism for selectively braking rotation of said third member of said third planetary gearset.
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19. 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 connectable with the engine for rotation therewith;
an output shaft;
a first planetary gearset having a first member operably coupled with said input shaft, a second member and a third member;
a second planetary gearset having a first member drivingly interconnected with said output shaft, a second member and a third member;
a third planetary gearset having a first member drivingly interconnected with said output shaft;
a first torque transmitting mechanism selectively operable to engage said second member of said first planetary gearset with said third member of said second planetary gearset to provide a first forward launch ratio;
a second torque transmitting mechanism selectively operable to engage said second member of said first planetary gearset with said third member of said third planetary gearset to provide a reverse launch ratio; and
a third torque transmitting mechanism for selectively braking rotation of at least one of said second member of said second planetary gearset and said second member of said third planetary gearset to serve as a reaction member in both said first forward launch ratio and said reverse launch ratio, wherein said first torque transmitting mechanism is fully engaged prior to controlled engagement of said third torque transmitting mechanism to establish said first forward launch ratio between said input shaft and said output shaft. - View Dependent Claims (20, 21)
a fourth torque transmitting mechanism selectively operable to engage said second member of said second planetary gearset for rotation with said input shaft; and
a fifth torque transmitting mechanism for selectively braking rotation of said third member of said third planetary gearset.
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Specification