TWO MODE CONTINUOUSLY VARIABLE TRANSMISSION

摘要

A two mode automatic transmission for a motor vehicle includes a variable ratio component, a plurality of planetary gear assemblies, a chain drive assembly and a plurality of torque transmitting devices. A first planetary gear assembly is associated with an input shaft, a first clutch and a first brake and provides forward and reverse gears. The variable ratio component is driven by the output of the first planetary gear assembly and drives the second planetary gear assembly. The second planetary gear assembly, which may be either a simple or compound planetary assembly, is associated with a second clutch and a second brake and drives the chain drive assembly. The output of the chain drive assembly drives a third planetary gear assembly which is associated with an output shaft.

主权项

1. A continuously variable automatic transmission for a motor vehicle comprising, in combination,
a housing, an input member, an output member, a first planetary gear assembly having a first, a second and a third element, said first element coupled to said input member, a variable ratio component having an input and an output, said input coupled to said third element of said first planetary gear assembly, a second planetary gear assembly having a first, a second and a third element, said first element coupled to said output of said variable ratio component, a chain drive assembly having an input and an output, said input coupled to said second element of said second planetary gear assembly, a third planetary gear assembly having a first, a second and a third element, said first element coupled to said output of said chain drive assembly, said second element coupled to said output member and said third element coupled to said housing, a first clutch selectively connecting said first element of said first planetary gear assembly with said third element of said first planetary gear assembly, a first brake selectively connecting said second element of said second planetary gear assembly with said housing, a second clutch selectively connecting said first element of said second planetary gear assembly with said third element of said second planetary gear assembly, and a second brake selectively connecting said third element of said second planetary gear assembly with said housing.