CHAP 2, SEC II
DESCRIPTION AND OPERATION OF
PAR 11-13
MAIN TRANSMISSION ASSEMBLY
66 push piston assembly 67 into housing
assembly 73, allowing the clutch plates to
separate and slip freely.
(3) The governor is a fluid velo-
city type. The governor ring, riveted or
welded to the left end of housing 73, is kept
f i l l e d w i t h o i l , r e t a i n e d i n t h e r i n g by
centrifugal force during rotation. The oil
thus moves at virtually the same speed as
does the ring. The pitot tube 76 is posi-
tioned so that its open end faces against
the movement of the oil in the governor
ring. The opposite end of the pitot tube
c o n n e c t s w i t h t h e h y d r a u l i c c o n t r o l s y s-
t e m .
Pressure in the governor line thus
varies with the speed at which oil is thrown
into the pitot tube by the rotating ring.
12.
INTERMEDIATE-RANGE
CLUTCH
AND PLANETARY GEARING
a. Intermediate-range Clutch
Components (fig. 376, fold-out 5)
( 1 ) I n t e r m e d i a t e - r a n g e c l u t c h i n-
cludes a clutch housing 3, four internal-
s p l i n e d 4 a n d t h r e e e x t e r n a l - s p l i n e d 5
plates, apply plate 7, spring 8 piston 9 and
piston housing 14. External splines on ring
gear assembly 6 serve as the clutch hub.
(2) Clutch housing 3 is anchored,
against rotation, in the transmission hous-
ing. Plates 5 and apply plate 7 engage
slots in housing 3. Plates 4 engage exter-
nal splines on ring gear assembly 6. Pis-
ton housing 14 is anchored in transmission
housing by bolt 42 (fig. 375, fold-out 4).
Piston 9 (fig. 376, fold-out 5) works in a
bore of housing 14 on ring seals 11 and 12.
b .
Intermediate-range
Planetary
Gearing Components (fig. 376,
fold-out 5)
( 1 ) P l a n e t a r y g e a r i n g f o r t h i s
range includes carrier 18, four 18-tooth
pinions 22, spindles 19, a 36-tooth sun gear
61 (fig. 375, fold-out 4) and a 72-tooth
ring gear assembly 6 (fig. 376, fold-out 5).
( 2 ) P i n i o n s 2 2 o r 6 4 r o t a t e o n
bearings 23 or 65 and are supported by
spindles 19 in the carrier. Sun gear 61
(fig. 375, fold-out 4) is splined to turbine
shaft 2. Ring gear 6 (fig. 376, fold-out 5)
has internal teeth and external splines.
Carrier 18 is supported by bearing 55 (fig.
375, fold-out 4) at one end and is splined
to low-range ring gear 38 (fig. 376, fold-
out 5) at the opposite end.
c. Operation of Intermediate-range
Clutch and Planetary Gearing
(fig. 376, fold-out 5)
( 1 ) W h e n h y d r a u l i c p r e s s u r e is
directed to the cavity between piston 9
and housing 14, the piston moves against
spring 8 and apply plate 7 and compresses
internal-splined 4 and external-splined 5
plates against housing 3. This locks ring
gear assembly 6 against rotation. Sun gear
6 1 ( f i g . 3 7 5 , f o l d - o u t 4 ) i s t h e d r i v i ng
m e m b e r o f t h e p l a n e t a r y . I t s r o t a t i on
drives pinions 22 or 64 (fig. 376, fold-out
5) counterclockwise (viewed from left of
transmission) while causing carrier 18 to
r o t a t e c l o c k w i s e . S t a t i o n a r y r i n g g e ar
assembly 6 is the reaction member and
carrier 18 is the driven member.
(2) When hydraulic pressure is ex-
hausted from the clutch cavity, spring 8
pushes piston 9 into housing 14. This allows
the clutch plates to separate and have
running clearance, releasing the clutch.
(3) The intermediate-range plan-
etary gearing is compounded with the low-
range planetary gearing to obtain the de-
sired ratio. The rotation of carrier 18 is
imparted to low-range ring gear 38. Low-
range sun gear 62 (fig. 375, fold-out 4) is
splined to the same shaft as is intermedi-
ate-range sun gear 61. Thus, the rotations,
at different speeds, of ring gear 38 (fig.
376, fold-out 5) and sun gear 62 (fig. 375,
f o l d - o u t 4 ) i m p a r t r o t a t i o n t o t h e l o w-
range shaft and carrier which is the trans-
mission out put shaft. The resulting com-
b i n e d r e d u c t i o n o f t h e t w o p l a n e t a ry
systems is 2 to 1.
13. LOW-RANGE CLUTCH AND
PLANETARY GEARING
a.
clutch
Low-range Clutch Components
(fig. 376, fold-out 5)
(1) The low-range clutch includes
housing 44, four internal -splined
14 Change 2
|
|