V-Matic Drive - Honda NU50 Shop Manual

~HONDA
~
NUSO·NUSOM
V-MATle DRIVE
TECHNICAL FEATURES
HONDA V·MATIC provides various drive ratios between the engine and rear wheel according to the engi'lc speed and load:1t
accomplishes this by two sets 01 pull!:ys, drive and driven, and by thc use of a drive belt
be,';"een
the pulleys. The dnve pulley is
31lilChed
to
the engine crankshaft. The driven pulley is attached to the shaft and also incorporates a centrifugal clutch. In the
V·Malic Drive, there is a final gear reduction between Ihe driven pulley and rear wheel, providing an additional increase in
torque.
MOVABLE DRIVE FACE
BALL BEARING
DRIVE FACE
NEEDLE BEARING
DRIVEN FACE
SPRING
CLUTCH WEIGHT
DRIVE
SHAFT
CLUTCH
OUTER
DRIVE PULLEY DRIVEN PULLEY
DRIVE PULLEY
DRIVEN PULLEY
~1
-
7 :-'\
~Q-
)
(
8;
\8j
~
When the engine is running at low speed, the unit can
increase or multiply lOrqUl! so that more torque is
delivered than at high engine ~peed through 3 greater
drive ratio.
REDUCTION RATIO; 2; 1
As the speed of the engine increases, or load on the
rear wheel decreases, centrifugal force on lhe weight
rollers throws the rollers radially outward. When the
rollers are forced outward, they press-in the movable
face of the dri . . . . e pulley closer to the drive face which
will result in a reduced drive ratio between the driven
and drive pulleys.
REDUCTION RATIO: 1: 1
Date of Issue: Nov., 1981
lD HONDA MOTOR CO., LTD.
151
14-5