Opel 1900 1973, Service Manual

Page: 404 / 625

A U T O M A T I C T R A N S M I S S I O N
43
LONG PINION
INPUT SUN G
PLANETARY CARRIER
Figure Third Gear
LONG PINION
ORT PINION
INPUT SUN
PLANETARY CARRIER
Figure Reverse
Three Speed automatic transmission has three disc
clutches, a band and a
(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
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.
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
together, thus causing the hub to rotate with
the or remain stationary with the housing. See
Figure 12.
DRUM
FORCE APPLIED
FORCE APPLIED
r
Figure Clutch Applied
CLUTCH
APPLY
PISTON
CLUTCH
SPRING
r
HUB
CLUTCH DISCS
RELEASED
CLUTCH HUB
Figure Clutch Released