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Fig.
4-64.
Planetary
gear
GEARBOX
The gearbex censists ef a
mechanical
pewer trans-
missien system
-
planetary gear,
twe
c1utches, twe
brake bands and a ene-way
c1utch
-
and a
hydraulic
system
-
frent and rear pump, centrifu9'al geverner
and 'a centrO'I valve system whi,ch regulates
the fluid
pressure
and
directs
the
fluid
te
the varieus gearbex
cempenents.
MECHANICAL POWER
TRANSMISSION
SYSTEM
PLANETARY GEAR
The planetary gear set
oensis,
t s
ef twe sun gears, twe
sets ef piniens, a pinien amrier and a ring gear, see
Fig.
4-64.
Helical
invO'lute
teoth
ferms
are
used
threugheut. In aH ferward genrs, pewer enters threugh
the ferwa'rd sun g'ear; in
reverse,
pewer enters threugh
the reverse sun
g'
e ar. Pewer leaves the gear set by
the ring geaT. The piniens are used te transmit pewer
frem the sun gearste the
ring
gear. In reverse,
C1
single s,et ef piniens is used which oauses
:the
ring gear
te rotate in the eppesite directien te the sun gear. In
ferward gears, a deuble set ef piniens i,s used te cause
the ring
g'
e
aJ
r te retate in the same directien as the sun
gear. Tlhe carrier leaates the piniens in their corred
pesitiens relative te the twe sun
geaj
r s and the ring
g'ear (and alse ferms a reactien member in certain
4:
26
Fig. 4-65.
Planetary
gear,
c1utches
and brake
bands
cenditiell's).
The
varieus mechanical raties ef the
gear
set
'
a re obtained by the eng'agement of hy,draulically
eperated multi-disc c1utches
and
brake bands.
CLUTCHES
The c1utches, see Fig. 4-65, censist ef multi-disc units
epemted by hydraulic pistens.
In
all ferward gears
the frent
c1utch
cenneds the cenverter te the fer-
wnrd sun gear; fer reverse, the rear c1utch cennects
the cenverter te
the
reverse sun gear.
BRAKE
BANDS
Brake bands, operated by hydraulic se,rves, held
elements ef the gear set statienary
te
effect an out-
put speed reductien and a terque increase. In ",Ieck-
up",
the rear
band helds the pinien carrier
statienary
and prevides the 1 st gem ratie ef 2.39: 1 and, in
re-
verse, a
'
r atie
ef 2.09: 1. The frent band helds the
r,everse sun gem statienary te previde the 2nd gear
ratio ef 1.45: 1.
ONE-WAY CLUTCH
In
the
drive pesitien "D", a ene-way clutoh is used
in place
of
t,he rear band te prevent the pinien carrier
from
tuming
eppesite te engine retatien, thus alse
previding a 1 st gear ratie ef 2.39:
1.
This ene-way
c1utch, allewing the genrbox te freewheel in 1 st gear,
prevides smeeth ratie changes frem 1 st te 2nd and
vice versa.
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