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AUTOMATIC TRANSMISSION - NAG1
PISTONS (Continued)
Fig. 197 Force Multiplication
Fig. 198 Piston Travel
PLANETARY GEARTRAIN
DESCRIPTION
Three planetary gear sets (Fig. 199) are used to
produce the different gear ratios. These are located
in the mechanical part of the transmission as the
front, middle and rear planetary gear sets.
Fig. 199 Planetary Geartrain
1 - ANNULUS GEAR
2 - PLANETARY PINION GEARS
3 - SUN GEAR
4 - PLANETARY CARRIER
OPERATION
The annulus gear (1) (Fig. 200) and sun gear (3)
elements of a planetary gear system are alternately
driven and braked by the actuating elements of the
multi-plate clutch and multiple-disc brake. The plan-
etary pinion gears (2) can turn on the internal gear-
ing of the annulus gear (1) and on the external
gearing of the sun gear (3). This allows for a variety
of gear ratios and the reversal of the rotation direc-
tion without the need for moving gear wheels or shift
collars. When two components of the planetary gear
set are locked together, the planetary gear set is
locked and turns as a closed unit.
Fig. 200 Planetary Geartrain
1 - ANNULUS GEAR
2 - PLANETARY PINION GEARS
3 - SUN GEAR
4 - PLANETARY CARRIER
VA
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