AT -12
AUTOMATIC TRANSAXLE (F4A51)
POWER TRAIN
E5E54FA9
P POSITION
Hydraulic pressure is applied to the LR brake and the RED
brake, so power is not transmitted from the input shaft to
the UD clutch or OD clutch, and the output shaft is locked
by the park brake pawl interlocking the park gear.
N POSITION
Hydraulic pressure is applied to the LR brake(A) and the
RED brake, so power is not transmitted from the input shaft
to the UD clutch or OD clutch.
A
EKRF003A
1ST GEAR POWER FLOW
Hydraulic pressure is applied to the UD clutch(B) the LR
brake(A) and the one way clutch(OWC), then the UD clutch
transmits driving force from the input shaft to the UD sun
gear, and the LR brake locks the LR annulus gear to the
case.The UD sun gear of the planetary gear drives the
output pinion gear, and the LR brake locks the annulus
gear, and the output pinion drives the output carriers, and
the output carrier drives the transfer drive gear, and the
transfer drive gear drives the transfer driven gear of the
output shaft, and power is transmitted to the differential
gear through the differential drive gear.
A
B
EKRF003B
2ND GEAR POWER FLOW
Hydraulic pressure is applied to the UD clutch(A) the 2nd
brake(B) and the one way clutch(OWC), then the UD clutch
transmits driving force from the input shaft to the UD sun
gear, and the 2nd brake locks the reverse sun gear to the
case.The UD sun gear of the planetary gear drives the out-
put pinion gear and the LR annulus gear, and the LR annu-
lus gear drives the OD planetary carriers, and OD plane-
tary carriers drives OD pinion gear, and the OD pinion gear
drives the output carriers, and the output carrier drives the
transfer drive gear, and the transfer drive gear drives the
transfer driven gear of the output shaft, and power is trans-
mitted to the differential gear through the differential drive
gear.
B
A
EKRF003C