Two-mode continuously variable transmission

摘要

A continuously variable transmission includes a gearbox with two forward modes and a reverse mode. The gearbox includes a plurality of gear members and further includes at least three torque transmitting devices such as, clutches and brakes that are selectively employed to engage various combinations of the gear members such that a particular combination is associated with one of the two forward modes and the reverse mode.

主权项

1. A two-mode continuously variable transmission (CVT) comprising:
a variator; and a gear box coupled to the variator through an input transfer gear, the gear box including a set of no more than three torque transmitting members including a first torque transmitting member, a second torque transmitting member and a third torque transmitting member, the gear box also including no more than two planetary gear sets including a first planetary gear set with a plurality of gear members and a second planetary gear set with a plurality of gear members, both the first planetary gear set and the second planetary gear set being positioned about a shaft, wherein the first torque transmitting member couples the second planetary gear set to a stationary member when the first torque transmitting member is engaged to produce a first forward mode of no more than two forward modes, wherein the second torque transmitting member couples a member of the first planetary gear set to a member of the second planetary gear set when the second torque transmitting member is engaged to produce a second forward mode of the two forward modes, and wherein the third torque transmitting member couples the first planetary gear to the stationary member when the third torque transmitting member is engaged to produce a reverse mode.