Drive-Second Gear; Drive-Third Gear; Torque How In Drive-Second Gear - Jeep J-10 Series 1982 Technical & Service Manual

At this point, torque flow is through the rear clutch and
front annulus gear, into the front planetary gears and to
the rear planetary gears through the counter-rotating
sun gear (fig. 2C-9).
The rear annulus gear is splined to the output shaft.
The rear planetary gear carrier is locked to the low-
reverse drum which in turn is splined to the overrunning
clutch inner race. The overrunning clutch permits car
rier/drum rotation in the direction of engine rotation
only; the clutch locks up if turned opposite engine
rotation.
With the rear annulus gear stationary, the action of
the revolving rear planetary gears on the rear annulus
gear causes the rear planetary carrier and low/reverse
drum to rotate opposite engine direction. However, be
cause the low/reverse drum is splined to the over
running clutch, the clutch locks up preventing both
drum and carrier from turning in a direction opposite to
engine rotation.
Because the rear planetary carrier and low/reverse
drum are held stationary by the overrunning clutch,
torque is then transferred to the output shaft through
the rear annulus gear which is splined to the shaft.
Drive-Second Gear
In Drive-second gear, the front band is applied in
addition to the rear clutch which remains applied from
Drive-first gear. The overrunning clutch is not employed
in this gear and free wheels.
In response to increasing speed and pressure signals
from the governor and throttle linkage, the transmis
sion upshifts to second gear. The front servo is charged
with fluid at operating pressure to apply the front band
and complete the 1-2 upshift.
When the front band is applied, it holds the front
clutch retainer preventing the retainer from turning.
Because the retainer is locked to the driving shell, the
shell and sun gear which is splined to the driving shell
are also held stationary (fig. 2C-10).
Since the rear clutch is still applied, engine torque
continues to flow through the rear clutch retainer to the
front annulus gear turning the gear at engine speed and
direction of rotation. However, because the sun gear is
now stationary, front annulus gear rotation causes the
front planetary gears to revolve in engine direction of
rotation. This action causes the front planetary carrier
to also rotate in engine direction but at a reduced speed.
Engine torque is then transferred directly to the
output shaft through the front planetary carrier which
is splined to the shaft (fig. 2C-10). Note that torque flow
occurs through the front planetary gears only in Drive-
second gear. The rear planetary gears are in an idling
condition and the low/reverse drum is freewheeling
with the overrunning clutch. Although the rear annulus
gear revolves with the output shaft, it does so only
because it is splined to the shaft.
AUTOMATIC TRANSMISSION 2C-7
FRONT BAND
APPLIED
INPUT
SHAFT
REAR CLUTCH
ENGAGED
OUTPUT SHAFT
807S4
Fig. 2C-10 Torque How in Drive-Second Gear
Drive-Third Gear
In Drive-third gear, the front clutch is applied in
addition to the rear clutch which remains applied from
Drive-second gear.
When vehicle speed reaches 2-3 upshift range, front
servo fluid is evacuated releasing the front band. At the
same time, the front clutch retainer is charged applying
the clutch.
Now that both clutches are applied, engine torque is
transmitted through the front clutch retainer in addi
tion to the rear clutch retainer and front annulus gear
(fig. 2C-11). Since the rear clutch retainer is always
locked to the driving shell, torque is also transferred
through the sun gear which is splined to the shell. This
causes the sun gear to revolve at engine speedand direc
tion of rotation.
FRONT CLUTCH
ENGAGED
INPUT
SHAFT
REAR CLUTCH
ENGAGED
-"= '-ft"* \ J%
OUTPUT
SHAFT
80755
Rg. 2C-11 Torque Flow in biivt-Thii»tw\