Honda Civic 1998 Service Manual page 605

Description
Clutches/Reverse Brake/Planetary Gear/Pulleys
Clutch€s/Reverse Brake
T h e C V T u s e s t h e h y d r a u l i c a l l y - a c t u a t e d
c l u t c h e s a n d b r a k e t o e n g a g e o r d i s e n g a g e t h e t r a n s m i s s i o n g e a r s . W h e n
hydraulic pressure is introduced into the clutch drum and the reverse brake piston cavity, the clutch piston and the reverse
brake piston move. This presses the friction discs and the steel plates together, locking them so they don,t slip. power is
t h e n t r a n s m i t t e d t h r o u g h t h e e n g a g e d c l u t c h p a c k t o i t s h u b - m o u n t e d g e a r , a n d t h r o u g h e n g a g e d r i n g g e a r t o p i n i o n
gears.
Likewise, when the hydraulic pressure is bled from the clutch pack and the reverse brake piston cavity, the prston reteases
the friction discs and the steel plates, and they are free to slide past each. This allows the gear to spin independently on its
shaft, transmitting no power.
Start Clutch
The stan clutch, which js located at the end of the driven pulley shaft, engages/disengages
the secondary drive gear.
The stan clutch is supplied hydraulic pressure by its ATF feed pipes within the driven pullev shaft.
Forward Clutch
The forward clutch, which is located at the end of the drive pulley shaft, engages/disengages
the sun gear.
The forward clutch is supplied hydraulic pressure by its ATF feed pipe within the drive pullev shaft.
ReveFe Brake
The reverse brake, which is located inside the intermediate housing around the ring gear, locks the ring gear in
@ posi-
tion The reverse brake discs are mounted to the ring gear and the reverse brake plates are mounted to the intermediate
housing. The reverse brake is supplied hydraulic pressure by a circuit connected to the internal hydraulic circuit.
Planetary Gear
The planetary gear consists of a sun gear, a carrier assembly, and a ring gear. The sun gear is connected to the Input shaft
with splines The pinion gears are mounted to the carrier which is mounted to the forward clutch drum. The sun gear
inputs the engine power via the input shaft to the planetary gear, and the carrier outputs the engine power. The ring gear
is only used for switching the rotation direction of the pullev shafts.
In @, $, and E positions (forward range), the pinion gears don't rotate and revolve with the sun gear, so the carrier
rotates ln S position (reverse range), the reverse brake locks the ring gear and the sun gear drives the prnton gears to
rotate. The pinion gears rotate and revolve in the opposite direction from the rotation directlon of the sun gear, and the
carrier rotates with pinion gear revolution.
Pulleys
Each pulley consists of a movable tace and a fixed face, and the effective pulley ratio changes with engine speed. The
drive pulley and the driven pulley are linked by the steel belt.
To achieve a low pulley ratio, high hydraulic pressure works on the movable face of the driven pulley and reduces the
effective diameter ot the drive pulley, and a lower hydraulic pressure works on the movable face of the drive pulley to
eliminate the steel belt slippage. To achieve a high pulley ratio, high hydraulic pressure works on the movable face of the
drive pulley and reduces the effective diameter of the driven pulley, and a lower hydraulic pressure works on the movable
face of the driven pulley to eliminate the steel belt slippage.
\
1 4 - 1 6 6