POWER TRAIN
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Automatic Transaxle
2-43
Underdrive Clutch
L
Underdrive
clutch
Rear sun
gear
Hub
-
j
Underdrive clutch
hub shaft
Input clutch
reiainer
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The underdrive clutch is located in the front of the
input clutch retainer. Line pressure is supplied to
the clutch from the valve body, through passages
i
in the case, oil pump and reaction shaft support.
The pressure then passes through a drilled passage
in the input clutch hub and to the front side of the
underdrive piston. The piston moves toward the
rear of the transaxle, compressing the clutch and
connecting it to the underdrive hub. The underdrive
hub is splined to the rear sun gear and turns it
when the clutch is engaged.
When
line pressure is released, the clutch piston
returns with tension from the coil spring between
the piston and spring retainer. The piston has a
vent in it, and the spring retainer has a seal on
it. Both the vent and retainer seal are used to keep
oil on the back side of the piston. They counteract
the centrifugal pressure that develops when the
clutch is spinning. Centrifugal pressure can cause
the piston to move slightly and the clutch to drag
when the clutch is not actually being applied.
Overdrive Clutch
Overdrive clutch
Front planetary
carrier
/
Clutch retainer
Overdrive
clutch hub
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