P A R 5 0
T O R Q U E P A T H S
C H A P 2 S E C V
50. TORQUE PATH – FOURTH
LOCKUP OPERATION (fig.
GEAR,
26)
Figure 26. Fourth-gear torque path, lockup operation
a . T o r q u e i s t r a n s m i t t e d t o t h e t u r b i ne
shaf in the manner described in pars. 42 and
4 3 , a b o v e . I n f o u r t h g e a r , t o r q u e i s t r a n s -
mitted directly by the high-range clutch and
t h e r e i s n o p l a n e t a r y g e a r a c t i o n . E n g a g e-
ment of the high-range clutch locks the turbine
shaft and high-range clutch hub together. The
h i g h - r a n g e c l u t c h h u b i s i n t e g r a l w i t h t he
i n t e r m e d i a t e - r a n g e p l a n e t a r y c a r r i e r . T he
intermediate-range sun gear is splined to the
t u r b i n e s h a f t . T h e r e f o r e , t h e i n t e r m e d i a t e-
range planetary gearing is locked and rotates
as a unit.
b . The low-range ring gear is attached to
t h e i n t e r m e d i a t e - r a n g e p l a n e t a r y c a r r i e r . As
a result, when the turbine shaft rotates, all
m e m b e r s o f a l l r a n g e p l a n e t a r y s e t s r o t a te
w i t h t h e t u r b i n e s h a f t , a t t h e s a m e s p e e d .
Thus, torque is transmitted from the turbine
shaft to the output transfer drive gear at 1 to
1 ratio.
c . T h e r e m a i n d e r o f t h e t o r q u e p a t h is
identical
to
that
for
third
gear.
For
gear
ratios
applicable
to
fourth
gear,
refer
to
T A B U L A T E D D A T A , par. 7.
5
3
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