DRIVE SYSTEM-IVT
31
The output shaft of the T-box drives a sun gear in
the center of the planetary gears at the same speed as
the input discs. The planetary gear carriers are
attached to the output discs. See Figure 5B.7
The epicyclic gear set acts like an adding machine,
it subtracts the input (sun gear) speed from the output
(planetary gear carrier). See Figure 5B.8
Figure 5B.7
Output disk
Epicyclic gear set
Carrier
Planetary
gears
Figure 5B.8
Planetary gear
Sun gear
Carrier
If the answer is positive, transmission drives in a
forward direction. If the answer is negative, the trans-
mission drives in reverse. If the answer is zero, the
transmission will have zero output and be in what is
known as a geared neutral state. See Figure 5B.9
The answers from the epicyclic gear sets are col-
lected by the transmission output shafts that are driven
b the planetary gears. See Figure 5B.10
Figure 5B.9
Figure 5B.10
Output shaft
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