(4) Second range (fig. A-3).
The transmission must have the
forward and second clutches applied for this range. When the second
clutch engages, it prevents the front planetary assembly from
rotating.
When engaged, the forward clutch locks the range input
gear and main shaft together so they rotate as a unit. Since splines
join the rear sun gear to the rotating main shaft at one end and the
center ring gear at the other end, they all rotate at range input
speed.
With the carrier of the front planetary assembly prevented
from moving by engagement of the second clutch, the rotating center
ring turns the center sun gear through the planetary pinions.
Splines join the center sun gear to the sun gear shaft assembly at
one end and the front sun gear at the other end. The rotating front
sun gear turns the front carrier pinions (the engaged second clutch
prevents the carrier from rotating).
The rotating front carrier
pinions rotate the front ring gear. The front ring gear is splined
through the front ring gear and rear carrier assembly to the range
output gear.
(5) Third range (fig. A-4).
The transmission must have the
forward and third clutches applied for this range.
Application of
the third clutch prevents the sun gear shaft from rotating, which in
turn prevents the center sun gear (splined to the rear of the shaft)
from turning. When engaged, the forward clutch locks the range input
gear and main shaft together so they rotate as a unit. Since splines
joint the rear sun gear to the rotating main shaft at one end and the
center ring gear at the other end, they all rotate at range input
speed.
With the center sun gear stationary and the center ring gear
rotating, the ring gear drives the center planetary carrier pinions.
This causes the center planetary carrier to rotate at a speed
reduction.
Through splines, the center carrier, the rear planetary
carrier, and front ring gear connect and rotate as a unit. The rear
carrier connects to the range output gear, which rotates with the
rear carrier at the same speed as the center planetary carrier.
(6) Fourth range (fig. A-5).
The transmission must have the
forward and fourth clutches applied for this range.
Application of
the clutches locks the transmission main shaft and the sun gear shaft
lock together and they rotate as a unit at range input speed. With
the center and rear sun gears rotating at the same speed (locked
together), and the carriers splined to the front ring gear, all
components rotate at range input speed. Since the transmission range
output gear is splined to the rear carrier it gives a range output
ratio of 1.00:1.
22
OD1710
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