Subaru SVX 1992 Manual page 404

AUTOMATIC TRANSMISSION AND DIFFERENTIAL
[MSBO1 3- 2
When hydraulic pressure 4A is applied to the servo
chamber (III) under the 3rd speed condition, the band
servo piston O.D . is brought into contact with the
retainer installed at the lower end of the band servo
piston stem . Hence, the stem is pushed upward . As a
result, state (C) is achieved where the brake band slowly
tightens the reverse clutch drum and fixes the front sun
gear of the front planetary gear . (4th speed state) The
accumulator is built into the transmission case as shown
in the Figure . When hydraulic pressures 2A, 3R, and 4A
are applied from the hydraulic control unit to the re-
spective servo chambers, the hydraulic shock loads are
absorbed by the accumulator. This is because the ac-
cumulator piston moves slowly, and the brake band is
tightened or released slowly . This results in smooth
gearshift operation .
Accumulator
piston
ICI ! ;
i j III
Spring
B3-462
Fig. 17
9 . One-way Clutch
A: CONSTRUCTION
The one-way clutch (O .W .C .) is a Sprague type . Two
clutches are used . One is mounted between the one-
way clutch outer race and the rear internal gear ASSY .
The other is located between the forward clutch drum
and the one-way clutch inner race .
B: FUNCTION
The former O.W .C . (3-4) is provided to prevent counter-
clockwise rotation (as viewed from the front) of the rear
internal gear ASSY of the rear planetary gear during 1st,
2nd and 3rd speeds of the "D" range, "3" range, "2"
range and "1st range" . At the 4th speed of the "D"
range, therefore, the rear internal gear ASSY rotates
clockwise so that the O.W .C . rotates freely to ensure
smooth transition between 3rd and 4th speeds .
On the other hand, the latter O.W .C . (1-2) is provided to
prevent counterclockwise rotation (as viewed from the
front) of the forward clutch ASSY during 1st speed of
the "D" range and 1st speed of the "3" range. There-
fore, when shifting from 1st speed of the "D" range or
"3" range to 2nd speed, the forward clutch ASSY
rotates clockwise. As a result, the O .W .C . now rotates
freely ensuring smooth transition between 1st and 2nd
speeds .
Fig. 18
13