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US 2015/0308551 A1Published application
Three mode continuously variable transmission
AssigneeGM Global Technology Operations LLC
InventorsEdward W. Mellet, CRAIG S. ROSS, CHUNHAO J. LEE
Life of this patent
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Abstract
A three mode continuously variable transmission (CVT) for a motor vehicle includes an optional speed change device connected to a pulley and a belt assembly or other continuously variable unit. The pulley and belt assembly is also connected to a planetary gear set arrangement. The planetary gear set arrangement generally includes two planetary gear sets, two brakes and two clutches. The planetary gear set arrangement is connected to a final drive unit. Engagement of the clutches and brakes provides three modes of operation to the CVT.
Claims20
A continuously variable transmission comprising:
- an input member;
- an output member;
- a continuously variable unit interconnected with the input member;
- a gearbox connected to the continuously variable unit and to the output member, the gearbox comprising:
- a first planetary gear set connected to a second planetary gear set by at least two fixed connections;
- two torque transmitting mechanisms connected between the continuously variable unit and the first and second planetary gear sets;
- and
- two torque transmitting mechanisms connected between the first and second planetary gear sets and a stationary member;
- wherein engagement of two of the four torque transmitting mechanisms provides three separate modes of operation to the continuously variable transmission.
6 more elements
A continuously variable transmission comprising:
- an input member;
- an output member;
- a continuously variable unit interconnected with the input member;
- a gearbox connected in series with the continuously variable unit and the output member, the gearbox comprising:
- a first planetary gear set having a first member, a second member, and a third member;
- a second planetary gear set having a first member, a second member, and a third member, wherein the second member of the first planetary gear set is directly connected to the third member of the second planetary gear set and the third member of the first planetary gear set is directly connected to the second member of the second planetary gear set and to the output member;
- a first torque transmitting mechanism connected between the continuously variable unit and the first member of the first planetary gear set;
- a second torque transmitting mechanism connected between the continuously variable unit and the first member of the second planetary gear set;
- a third torque transmitting mechanism connected between the first member of the first planetary gear set and a stationary member;
- and
- a fourth torque transmitting mechanism connected between the second member of the first planetary gear set and the third member of the second planetary gear set and the stationary member;
- wherein engagement of two of the four torque transmitting mechanisms provides three separate modes of operation to the continuously variable transmission.
9 more elements
A continuously variable transmission comprising:
- an input member;
- an output member;
- a continuously variable unit interconnected with the input member;
- a gearbox connected in series with the continuously variable unit and the output member, the gearbox comprising:
- a first planetary gear set having a sun gear and a ring gear;
- a second planetary gear set having a sun gear and no ring gear, wherein the first and second planetary gear sets share a common planet carrier connected to the output member;
- a first torque transmitting mechanism connected between the continuously variable unit and the sun gear of the first planetary gear set;
- a second torque transmitting mechanism connected between the continuously variable unit and the sun gear of the second planetary gear set;
- a third torque transmitting mechanism connected between the sun gear of the first planetary gear set and a stationary member;
- and
- a fourth torque transmitting mechanism connected between the ring gear of the first planetary gear set and the stationary member;
- wherein engagement of two of the four torque transmitting mechanisms provides three separate modes of operation to the continuously variable transmission.
9 more elements
Dependencies are inferred from the claim text.