Figure 23
C H A P 2, SEC V
T O R Q U E P A T HS
P A R 4 7
4 7 . T O R Q U E P A T H – F I R S T G E A R,
C O N V E R T E R O P E R A T I O N ( f i g . 2 3)
a . In first gear, torque is transmitted to
the turbine shaft through the input transfer
gearing and the torque converter (or lockup
clutch). The low-range sun gear is splined to
the turbine shaft and imparts torque to the
l o w - r a n g e p l a n e t a r y p i n i o n s . T h e l o w - r a n ge
clutch is engaged, holding the low-range ring
gear stationary. Thus, the low--range plane-
tary pinions must rotate within the stationary
r i n g g e a r . T h i s d r i v e s t h e l o w - r a n g e p l a n e-
tary carrier and shaft in the same direction
as the turbine shaft but at reduced speed.
b . T h e l o w - r a n g e c a r r i e r s h a f t d r i v es
the output transfer drive gear. In turn, the
drive gear transmits torque to the output trans-
fer driven gear, causing it to rotate in the op-
p o s i t e d i r e c t i o n . T h e d r i v e n g e a r t r a n s m i ts
t o r q u e t o t h e r i g h t - a n d l e f t - g e a r e d s t e er
planetary ring gears .
c . T h e r i g h t - a n d l e f t - g e a r e d s t e e r
clutches are engaged, holding the geared steer
sun gears stationary. The geared steer plane -
tary pinions, meshed with both the sun gears
and ring gears,
a r e f o r c e d t o r o t a t e a r o u nd
t h e s t a t i o n a r y s u n g e a r s . T h e c a r r i e r t h u s
becomes the output member of the geared steer
planetary. Rotation at reduced speed is trans-
mitted to the right- and left-output couplings.
Refer to par. 7 for gear ratios applicable to
f i r s t g e a r.
5
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