Opel 1900 1973 Service Manual page 404

INPUT SUN G
PLANETARY CARRIER
Figure 7C-12 Third Gear
INPUT SUN
PLANETARY CARRIER
Figure 7C-13 Reverse
Three Speed automatic transmission has three disc
clutches, a band and a sprag (overrunning) clutch.
Disc Clutch
A disc clutch serves to connect or disconnect a rotat-
ing member with another rotating member or a sta-
tionary member. A clutch of this type can have one
or mgre discs or plates depending on the desired
capacity.
A disc clutch consists of drive plates, driven plates,
a hub and a drum or housing (depending on whether
the rotating member is being clutched to another
rotating member or a stationary member). The
method of apply in an automatic transmission is a
hydraulic piston.
LONG PINION
One set of plates is lined with friction material and
the other plates are steel. Whether the plates are
designated as "drive" or "driven" plates depends on
the power flow through the clutch.
One set of plates is splined to the drum or housing.
With the piston in the released position, the hub with
its plates are free to rotate relative to the drum or
housing. When hydraulic pressure is applied behind
the piston, the piston forces the drive and driven
the drur.1 or remain stationary with the housing. See
Figure 7C- 12.
LONG PINION
ORT PINION
A U T O M A T I C T R A N S M I S S I O N
DRUM
FORCE APPLIED
FORCE APPLIED
Figure 7C-14 Clutch Applied
r
CLUTCH
APPLY \
PISTON
CLUTCH
SPRING
Figure 7C-15 Clutch Released
r
HUB
CLUTCH DISCS
RELEASED
CLUTCH HUB