TM-9-2520-234-35
POWER TRAIN ASSEMBLY; ALLISON MODEL XTG411-2A
TECHNICAL MANUAL; FIELD AND DEPOT MAINTENANCE MANUAL
JULY 1962
TM-9-2520-234-35 - Page 84 of 323
CHAP
2,
SEC
V
TORQUE PATH S
PAR
5 1
51. TORQUE PATH – REVERSE 1 GEAR,
CONVERTER OPERATION (fig. 27)
a . Torque is transmitted to the turbine
shaft in the manner described in pars. 42 and
43, above. In reverse range, torque is trans-
mitted from the turbine shaft to the output
transfer drive gear by a compound arrange-
ment of the reverse-range and low-rang e
planetary gears.
b . The input member of this compound ar-
rangement is the low-range sun gear. Torque
is transmitted to the low-range pinions which
rotate in the direction opposite the sun gear.
The slower moving, low-range carrier, al -
though it is rotating, is a reaction member.
The low-range ring gear, meshed with it s
pinions, rotates in the direction opposite the
sun gear. Thus, the reversal of rotation ac-
tually occurs in the low-range planetary.
Figure 27. Reverse 1-gear torque path, converter operation
c . The reverse-range sun gear is at -
tached to the low-range ring gear and rotates
with it. The reverse-range clutch is engaged,
holding the reverse-range ring gear stationary.
The reverse-range planetary pinions are in
mesh with both the ring gear and sun gear.
The rotation of the reverse-range sun gear
forces the pinions to rotate within the station-
ary ring gear. This drives the reverse-range
carrier in the same direction as, but at a
slower speed than, the sun gear. The reverse-
range carrier, splined to the low-range plane-
tary carrier shaft, drives the output transfer
drive gear.
d . The remainder of the torque path is
identical to that described for first gear in
par. 47b and c , above. Refer to TABULATED
DATA, par. 7, for gear ratios applicable to
reverse 1 gear.
5 4
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