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US 8,998,760 B2Granted
Dual damper isolation for a motor vehicle hybrid powertrain
AssigneeGM Global Technology Operations LLC
InventorsNorman Schoenek, Hong Yang
Life of this patent
Estimating the term…
Abstract
A hybrid transmission has an input member, an output member, three planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices include clutches and brakes. The input member is driven by an internal combustion engine and an electric motor.
Claims16
A hybrid powertrain having a transmission powered by an engine, the powertrain comprising:
- an input member;
- an output member;
- first, second, and third planetary gear sets each having first, second and third members, wherein the input member is continuously connected for common rotation with the first member of the second planetary gear set;
- a first interconnecting member continuously interconnecting the third member of the first planetary gear set with the second member of the second planetary gear set;
- a second interconnecting member continuously interconnecting the second member of the first planetary gear set and the output member with the third member of the third planetary gear set;
- a third interconnecting member continuously interconnecting the third member of the second planetary gear set with the second member of the third planetary gear set;
- six torque transmitting mechanisms selectively engageable to interconnect at least one of the first, second, and third members with at least another of the first, second, third members and a stationary member;
- a first damper continuously interconnected with the engine;
- a one-way clutch for selectively interconnecting the first damper with the input member;
- a second damper continuously interconnected to the input member;
- an electric motor continuously interconnected to the second damper to provide a driving torque to the input member;
- a disconnect clutch for selectively interconnecting the first damper to the electric motor;
- and
- a hydraulic pump continuously interconnected with the input member, wherein the hydraulic pump supplies a pressurized hydraulic fluid to the transmission,
- wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish a plurality of forward speed ratios and at least one reverse speed ratio between the input member and the output member and the first damper has a spring rate and a hysteresis that is lower than a spring rate and a hysteresis of the second damper.
12 more elements
A transmission driven by a flywheel connected to an output of an engine, the transmission comprising:
- an input member;
- an output member;
- first, second, and third planetary gear sets each having first, second and third members;
- a first interconnecting member continuously interconnecting the third member of the first planetary gear set with the second member of the second planetary gear set;
- a second interconnecting member continuously interconnecting the second member of the first planetary gear set and the output member with the third member of the third planetary gear set;
- a third interconnecting member continuously interconnecting the third member of the second planetary gear set with the second member of the third planetary gear set;
- a first torque transmitting mechanism selectively engageable to interconnect the first member of the second planetary gear set with the first member of the third planetary gear set;
- a second torque transmitting mechanism selectively engageable to interconnect the first member of the second planetary gear set with the third member of the second planetary gear set and the second member of the third planetary gear set;
- a third torque transmitting mechanism selectively engageable to interconnect the first member of the third planetary gear set with a stationary member;
- a fourth torque transmitting mechanism selectively engageable to interconnect the third member of the second planetary gear set and the second member of the third planetary gear set with the stationary member;
- a fifth torque transmitting mechanism selectively engageable to interconnect the third member of the second planetary gear set and the second member of the third planetary gear set with the stationary member;
- a sixth torque transmitting mechanism selectively engageable to interconnect the first member of the first planetary gear set with the stationary member;
- a first damper continuously interconnected with the engine, wherein the first damper has a first spring rate and a first hysteresis;
- a one-way clutch for selectively interconnecting the first damper with the input member;
- a second damper continuously interconnected to the input member and the first member of the second planetary gear set, wherein the second damper has a second spring rate that is greater than the first spring rate of the first damper and a second hysteresis that is greater than the first hysteresis of the first damper;
- an electric motor continuously interconnected to the second damper to provide a driving torque to the input member;
- a disconnect clutch for selectively interconnecting the first damper to the electric motor;
- and
- a hydraulic pump continuously interconnected with the input member, wherein the hydraulic pump supplies a pressurized hydraulic fluid to the transmission, and
- wherein the torque transmitting mechanisms are selectively engageable in combinations of at least two to establish a plurality of forward speed ratios and at least one reverse speed ratio between the input member and the output member.
17 more elements
Dependencies are inferred from the claim text.