Powertrain with an electrically-variable transmission
View Patent ↗A powertrain incorporates two electrical units, two planetary gearsets in a radially-stacked package to provide a shortened length of the transmission. The output members of the electrical units are interconnected by a gear mechanism, which is drivingly connected with a conventional differential mechanism, which is aligned within the radial package of the electrical units. The electrical units combine with power from an engine to provide a two-mode compound-split electrically-variable transmission.
1. A powertrain having an electrically-variable transmission comprising:
an engine;
said electrically-variable transmission including an input shaft continuously drivingly connected with said engine;
a first electrical unit;
a second electrical unit;
a first planetary gearset rotatably disposed within said first electrical unit having a sun gear member continuously connected with said first electrical unit, a ring gear member and a planet carrier member continuously drivingly connected with an output member;
a second planetary gearset rotatably disposed within said second electrical unit having a sun gear member continuously connected with said second electrical unit, a planet carrier member continuously drivingly connected with an output member, and a ring gear member;
said ring gear member of said first planetary gearset being provided with a selectively engageable torque-transmitting mechanism for selective connection with said transmission input shaft;
said second planetary gearset being selectively connectible with a stationary portion of said transmission through a second selectively engageable torque-transmitting mechanism; and
said output member of said first planetary gearset and said output member of said second planetary gearset being disposed in meshing relationship with a transfer gear means which in turn is meshingly engaged with a final drive mechanism of said transmission.
2. The powertrain defined in claim 1 further wherein:
said input shaft is drivingly connected with a hydraulic pump arrangement and with a planetary gear mechanism including a sun gear member continuously drivingly connected with said first electrical unit, a ring gear member continuously drivingly connected with an interconnecting gear member, and a planet carrier member drivingly connected with said input shaft;
said interconnecting gear member drivingly connected with a transfer gear which is continuously connected with said second electrical unit; and
said transfer gear member being selectively connectible with said transmission housing with a third torque-transmitting mechanism.