TM-9-2520-254-34
TRANSMISSION, AUTOMATIC, ALLISON, MODEL TX100-1
TECHNICAL MAUAL; DIRECT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1971
TM-9-2520-254-34 - Page 40 of 126
b.
In reverse range, the reverse-range clutch is
engaged. This holds the reverse-range planetary
ring gear stationary. The reverse-range planetary
sun gear is driven (in reverse rotation) by the low-
range planetary ring gear. The low-range ring gear
is rotated by the low-range pinions. The low-range
pinions are rotated by the low-range sun gear which
is splined to the turbine shaft.
c.
This combination of two planetary gear sets to
produce the desired ratio and direction of rotation
is called compounding (para 2-5c). Reversing
actually takes place in the low-range planetary gear
set and final speed reduction takes place in the
reverse-range planetary gear set.
d.
The primary input of the compound system is
the low-range sun gear. The reaction member in the
low-range gear set is the low-range planetary
Figure 2-14. High-range torque path. lockup operation.
carrier, even though it rotates. The output member
of the low-range gear set, connected to the input
member of the reverse-gear set, is the low-range
ring gear. The input member of the reverse-range
gear set is the reverse-range sun gear. The primary
output is the reverse-range planetary carrier. The
prim ary reaction member of the compound system
is the reverse-range ring gear. The reverse-range
plan etary carrier transmits torque to the trans-
mission output shaft to which it is splined.
e.
In reverse range, the rear governor. rear oil
pump, and speedometer drive gear are driven in
reverse direction. Thus they are ineffective; no
rear-governor pressure is produced and no oil is
pumped by the rear oil pump. The reverse-direction
speed reduction ratio between con verter shaft and
transmission output is 4.35 to 1.
2-31
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