Speed and torqu e ar e n ot converted by th e dir ect
gear r atio of th e 4th gear. Power is tra nsferr ed from
the input shaft (25) to th e outpu t shaft (26) via th ree
locked plan etar y gearset s. (F ig. 8) (Fig. 9)
Front Planetary Gear Set
The pla neta ry ca rrier (13) and sun gear (21) are
connect ed via the engaged m ultiple-disc clutch K1
(7). The planetary gea rset is therefor e locked and
turns a s a closed u nit at the in pu t speed due to the
mecha nica l connection of th e a nnulus gear (8) and
the input shaft (25).
Rear Planetary Gear Set
The m ult iple-disc clu tch K2 (9) is engaged and
transfers the input speed of the inpu t shaft (25) t o
the planetar y carrier (15) via the annulus gear (10).
The annulus gear (11) turns in the same way as th e
planet ary ca rrier (15) due t o t he mechanica l connec-
tion with the locked front planet ary gea rset. The
planet ary gearset is therefor e locked an d tu rns as a
closed unit.
Center Planetary Gear Set
The a nnulus gear (10) turn s at the input speed as
a result of the en gaged multiple-disc clut ch K2 (9).
The multiple-disc clutch K3 (12) connects the sun
gear s (22) and (23) of t he rea r and cent er plan etar y
gear set. The planetar y gear set is locked by the same
speeds of t he ann ulus gea r (10) and the sun gea r (22)
and it turns as a closed u nit.
Fig. 9 Fourth Gear Powerflow
1 - TORQUE CONVERTER LOCK-UP CLUTCH 14 - CENTER PLANETARY CARRIER
2 - TORQUE CONVERTER TURBINE 15 - REAR PLANETARY CARRIER
3 - TORQUE CONVERTER IMPELLER 16 - TORQUE CONVERTER STATOR
4 - HOLDING CLUTCH B1 17 - FRONT PLANETARY PINION GEARS
5 - HOLDING CLUTCH B3 18 - CENTER PLANETARY PINION GEARS
6 - HOLDING CLUTCH B2 19 - REAR PLANETARY PINION GEARS
7 - DRIVING CLUTCH K1 20 - FREEWHEELING CLUTCH F1
8 - FRONT PLANETARY ANNULUS GEAR 21 - FRONT PLANETARY SUN GEAR
9 - DRIVING CLUTCH K2 22 - CENTER PLANETARY SUN GEAR
10 - CENTER PLANETARY ANNULUS GEAR 23 - REAR PLANETARY SUN GEAR
11 - REAR PLANETARY ANNULUS GEAR 24 - FREEWHEELING CLUTCH F2
12 - DRIVING CLUTCH K3 25 - INPUT SHAFT
13 - FRONT PLANETARY CARRIER 26 - OUTPUT SHAFT
A - ENGINE SPEED B - TRANSMISSION INPUT SPEED
VA AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION 21 - 15
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