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Automatic Transmission
G:01:01
1.
Step Down Gears (2)
2.
Ring and Pinion Gears
3. Differential Carrier
4.
Governor Drive Gear
5. Governor Driven Gear
6. Gear Train
7. Transmission Fluid Pump
Fig. 1 AUTOMATIC TRANSMISSION - SECTIONAL VIEW
GENERAL DESCRIPTION
The three speed transmission is a fully automatic
unit consisting primarily of a
3-element
torque
converter and a single planetary gear set. Two
multiple disc
clutches,
two multiple disc brakes,
and a one-way roller clutch provide the friction
elements required to obtain the desired functions
of the planetary gear set.
The transmission assembly consists of a torque
converter unit final drive unit and a hydraulic
transmission unit.
TORQUE CONVERTER UNIT (A):
The torque converter provides automatic clutch
action,
additional engine torque multiplication, and
smooth coupling for transmitting engine torque to
the mechanical assembly. The converter is of
welded construction and is serviced as an
assembly. The unit is made up of two vaned
sections
(turbine and pump) and a single stator
mounted on a one-way roller clutch. Automatic
clutch action and smooth coupling takes place
when circulating fluid within the converter couples
the two vaned sections together. Increased torque
is brought about by the stator redirecting the fluid
flow and providing an additional driving force
against the turbine.
FINAL DRIVE UNIT
(B):
The final drive transmits power from the hydraulic
transmission to the driving wheels. The unit
consists of a step-down gear, which lowers the
drive centerline and a differential assembly. The
differential is made up of a ring and pinion gear
assembly and carrier housing containing two
axle
side gears and two spider gears, including a
governor drive gear.
HYDRAULIC TRANSMISSION UNIT (C):
The hydraulic transmission receives power from
the torque converter turbine and converts this
power into three reduction ratios for forward
movement and one reduction ratio for reverse
movement. Forward and reverse gears are
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