Mitsubishi Eclipse. Technical Information Manual (1994) — part 40
2-46
POWER TRAIN
Automatic Transaxle
Low/Reverse Clutch
Front planetary
carrier
Low-reverse
clutch
.
Transaxle case
Separator
Piston
Snap
ring
plates
retainer
spring
Reaction
plate
Clutch
Piston
discs
snap ring
The second clutch, located in the rear of the trans-
axle case, is the Low Reverse (L/R) clutch. The
clutch is located in the very back of the case
and, as previously mentioned, shares the reaction
plate with the 2-4 clutch. Behind the reaction plate
is the clutch pack, belleville spring,
piston, and
piston retainer. The piston retainer is secured to
the case with three screws and sealed with a gasket.
The clutch is applied with line pressure from the
valve body that is directed through the transaxle
case to the piston retainer. This pushes the piston
forward and applies the clutch. When the clutch
is applied, it will lock or secure the front planetary
carrier to the transaxle case so it can not rotate.
When line pressure is released, the belleville spring
pushes the piston back to release the clutch.
POWER TRAIN
Automatic Transaxle
POWER TRAIN
Planetary Geartrain Assembly
Front sun
gear assembly
thrust
thrust
rear
assembly
gear
front
assembly
The entire planetary gear-train is located behind the
input clutch assembly and is inside the 2-4 and
clutch assemblies. The planetary geartrain
sists of two sun gears, two planetary carriers, two
(ring) gears, and one output shaft.
2-4 clutch
Low-reverse
Splined to
Front Sun Gear Assembly
The front sun gear assembly rides in the center of the front
carrier and is welded to the center of two hubs that are arranged
back to back. Each of the hubs are splined to a clutch. The
front most hub is splined to the reverse clutch and when applied
turns the front sun gear. The rearward hub is splined to the
2-4 clutch and when applied prevents the front sun gear from
turning.
Front Carrier Assembly
The front planetary carrier and rear
(ring) gear are
splined together as one unit. When the overdrive clutch is
applied, it drives the front carrier assembly by the overdrive
hub. When the low/reverse clutch is applied, it holds or prevents
the front carrier assembly from rotating.
Rear Sun Gear
The rear sun gear is located in the center of the rear carrier
assembly. There are two thrust bearings located on either side
of the sun gear. When the underdrive clutch is applied, it drives
the rear sun gear through the underdrive hub and shaft.
2-48
POWER TRAIN
Automatic Transaxle
sha
Lugs for parking
pawl and output
speed sensor
gear
Rear Carrier Assembly
The rear planetary carrier, front
(ring) gear and output
shaft are all one assembly. The rear carrier assembly is respon-
sible for providing all output power for the transaxle assembly.
In other words, all output from the transaxle must go through
the rear carrier. The lugs around the outside of the assembly
have two purposes; to engage the parking pawl when the driver
selects “park”, and to generate an output speed signal used
by the TCM.
There are no clutches splined or connected to this unit in any
way. The rear carrier assembly is supported to the case by
two tapered roller bearings which must be set up with a specific
preload setting.
Planetary Geartrain Powerflow
The planetary gear-train in this transaxle provides
four forward gear ratios and one reverse gear ratio.
To obtain these different gear ratios, two planetary
carrier and pinion assemblies, two sun gears and
two
(ring) gears are used. Two shafts are
used as input to the planetary
the
drive hub and shaft assembly, and the overdrive
hub with its shaft. The underdrive shaft protrudes
through, the center of the overdrive shaft and is
the longer of the two.
To achieve any output through the components of
this planetary
the following rules apply;
At least one component must be driven or turned,
one component must be held stationary (kept from
rotating), two components must be driven at the
same speed and in the same direction, and all output
from this
must go through the rear carrier
assembly.
The planetary gear-train is driven by three input
clutches. One of the input clutches must be applied
before the vehicle can move. A variety of gear ratios
are accomplished by using different input clutches
to turn different components of the planetary gear
set. Two clutches in the rear of the case must be
used to hold specific planetary components. When
going through the following power flows, keep in
mind that the gear-train must somehow complete
its power-flow by turning the rear carrier assembly.
If the output shaft/rear carrier assembly does not
turn, the vehicle will not move.
POWER TRAIN
Automatic Transaxle
2-49
First Gear
Underdrive clutch applied
(turns rear sun)
Low-reverse clutch applied
(holds rear
carrier)
In first gear range, torque input is through the under-
to “walk around” the inside of the stationary rear
drive clutch to the underdrive hub assembly. The
gear. ‘The pinions are pinned to the rear
underdrive hub is splined to the rear sun gear. When
carrier and cause the rear carrier assembly to rotate
the underdrive clutch is applied, it rotates the under-
as they “walk around” the
gear. This
drive hub and rear sun gear. The
clutch is applied
vides the torque output for first gear. The other
to hold the front carrier/rear
(ring gear)
tary
components are freewheeling. The first
assembly.
gear ratio is
The rear sun gear drives the rear planetary pinion
gears. The rear planetary pinion gears are forced
Second Gear
Underdrive clutch applied
(turns rear sun)
2-4 clutch applied
(holds front sun)
Second gear is achieved by having both planetary
rear pinions rotate the rear
carrier
gear sets contribute to torque multiplication. As in
sembly. The pinions of the front carrier will “walk
first gear, torque input is through the underdrive
around” the stationary front sun gear. This transmits
clutch to the rear sun gear. The 2-4 clutch is applied
torque to the front
carrier assembly
to hold the front sun gear stationary. The rotating
which provides output torque and a gear ratio of
rear sun gear turns the rear planetary pinions. The
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