| CPC F16H 37/086 (2013.01) [F16H 15/50 (2013.01); F16H 37/02 (2013.01); F16H 2037/0886 (2013.01)] | 17 Claims |
|
1. A multi-mode continuously variable transmission (CVT) for a work vehicle powertrain having an engine rotating an engine shaft to deliver engine power to the CVT, the CVT comprising:
a continuously variable power source (CVP) generating CVP power;
an input arrangement having an input shaft couplable to the engine shaft to receive the engine power and rotate about an input axis, the input shaft supporting one or more clutch components about the input axis;
a variator arrangement having a variator shaft rotating about a variator axis and supporting a planetary set and one or more clutch components about the variator axis;
a drop set arrangement having a drop set shaft rotating about a drop set axis and supporting one or more clutch components about the drop set axis; and
an output arrangement having an output shaft rotating about an output axis and supporting one or more output components about the output shaft;
wherein the input arrangement, the variator arrangement and the drop set arrangement provide a selective gear reduction for transmission of an output power according to a plurality of transmission modes in which:
(a) in a CVP-only mode:
a clutch of the input arrangement transmits the CVP power to the planetary set of the variator arrangement;
a clutch of the variator arrangement decouples the engine power from the planetary set of the variator arrangement;
a clutch of the drop set arrangement transmits the CVP power to the output arrangement; and
the output arrangement outputs the CVP power as the output power; and
(b) in a split-path mode:
a clutch of the input arrangement transmits the CVP power to the planetary set of the variator arrangement;
a clutch of the variator arrangement transmits the engine power to the planetary set of the variator arrangement where the planetary set combines the CVP power and the engine power;
a clutch of the drop set arrangement transmits the combined CVP and engine power to the output arrangement; and
the output arrangement outputs the combined CVP and engine power as the output power;
wherein the CVP-only mode is alternately operable as a first forward mode of the CVT and a first reverse mode of the CVT by alternatively operating the CVP in forward and reverse clock directions while maintaining engagement of the clutch of the input arrangement that transmits the CVP power to the planetary set of the variator arrangement; and
wherein the first forward mode and the first reverse mode of the CVT provide creeper and powered-zero operation in respective forward and reverse travel directions.
|