C H A P 2, SEC V
T O R Q U E P A T HS
P A R 4 9
Figure 25. Third-gear torque path, lockup operation
49. TORQUE PATH – THIRD GEAR,
LOCKUP OPERATION (fig. 25)
a . Torque is transmitted to the low- and
intermediate-range planetary sun gears in the
manner described in pars. 42 and 43, above.
In third gear, the low- and intermediate-range
p l a n e t a r y g e a r s a r e c o m p o u n d e d t o p r o d u ce
the desired speed reduction ratio. The inter-
mediate-range clutch is engaged, holding the
intermediate-range ring gear stationary. The
intermediate-range planetary pinions, meshed
with the intermediate-range sun gear, which
is rotating, and the stationary ring gear, must
rotate within the ring gear. This action drives
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.
b . The low-range planetary ring gear is
attached to the intermediate-range carrier and
rotates at a slower speed than the low-range
sun gear. Thus, the faster moving sun gear,
and slower moving ring gear, combine to drive
the low-range planetary pinions. The output
member of this compound arrangement is the
low-range planetary carrier and shaft.
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
i d e n t i c a l t o t h a t d e s c r i b e d f o r s e c o n d g e ar
( p a r . 4 8 , a b o v e ) .
Refer to T A B U L A T E D
D A T A , par. 7, for gear ratios applicable to
third gear.
52
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