Applying the forward clutch with the second clutch causes a reaction
within the planetary gearing and produces the second range. Applying
the fourth clutch with the second clutch produces the reverse 2
range.
i. First Clutch (fig. 1-13).
This clutch has a dual
function.
When engaged with the forward clutch, the forward and
the first
clutch produces the first forward range.
When engaging
the first
clutch with the fourth clutch, these clutches produce the
reverse 1
range.
The first clutch consists of internal-splined and external-tanged
clutches and a piston housed in the first and second piston housing.
The transmission housing holds the external-tanged clutch plates; the
internal-tanged clutch plates attach to the rear planetary ring gear,
through splines.
Applying hydraulic pressure to the back of the piston causes it to
move and press the clutch plates together.
This locks the rotating
(internal-splined) plates to the stationary (external-tanged) plates,
stopping the ring gear from rotating.
Applying the forward clutch with the first clutch causes a reaction
within the planetary gearing and produces the first range. Applying
the fourth clutch with the first clutch produces the reverse 1 range.
j. Planetary Gear Set (fig. 1-14). A simple planetary gear set
consists of a sun gear, carrier assembly, and ring gear.
The sun
gear is in the center of the planetary set and splined or
manufactured onto a shaft. The sun gear has external teeth that mesh
with the pinion gears of the carrier.
The carrier assembly is
between the sun gear and the ring gear of the planetary set.
The
carrier is the common member connecting the pinion gears together.
The ring gear is the outside member of the planetary set that
encompasses the pinion gears.
The internal teeth of the ring gear
mesh with the external teeth of the pinions.
To accomplish variations in speed and direction, the action within
the planetary set uses one member as an input or drive member,
another as a held or reactionary member, and one as an output or
driven member. Compounding of two or more planetary gear sets gives
additional variation of speed and direction.
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OD1710
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