CONTINUOUSLY VARIABLE TRANSMISSION WITH CHAIN OUTPUT

摘要

A multi-mode continuously variable transmission in a powertrain of a motor vehicle includes a continuously variable unit connected to a planetary gear set arrangement. The planetary gear set arrangement generally includes two planetary gear sets, two brakes, and one clutch and provides multiple modes of ratio selection between the continuously variable unit and a transmission output member. The transmission output member is connected to a chain driven final having only three axes of rotation.

主权项

1. A powertrain for a motor vehicle comprising:
a transmission input member; a transmission output member; a continuously variable unit having a first pulley pair connected for common rotation with the transmission input member, a second pulley pair, and an endless member wrapped around the first pulley pair and the second pulley pair; a first planetary gear set having a plurality of members; a second planetary gear set having a plurality of members, wherein the second planetary gear set is connected for common rotation to the first planetary gear set, the continuously variable unit, and the transmission output member; a clutch for selectively connecting for common rotation the first planetary gear set to the second planetary gear set; a first brake for selectively connecting the first planetary gear set to a stationary member; a second brake for selectively connecting the second planetary gear set to the stationary member; a chain drive connected for common rotation with the transmission output member; a transfer member connected for common rotation with the chain drive; and a final drive planetary gear set connected for common rotation with the transfer member, and wherein the powertrain includes only three axes of rotation from the transmission output member to the final drive planetary gear set.