In a hybrid transmission and its assembling method, a differential unit is constituted
by a single pinion planetary gear set and a double pinion planetary gear set holding
a carrier in common to the single planetary gear set and having five rotary members
from among which, when revolution states of two rotary members are determined,
those of the other rotary members are determined, an input end from a prime mover
is coupled to a ring gear of the double pinion planetary gear set, an output end
to a drive system that is coupled to the common carrier, a first motor/generator
that is coupled to a sun gear of the double pinion planetary gear set, a second
motor/generator that is coupled to a sun gear of the single pinion planetary gear
set, and a brake enabled to brake a ring gear of the single pinion planetary gear set.
