V-Matic Belt Drive System Description - Honda Motorcycle Service Manual

V-MATIC BELT DRlVE SYSTEM
SYSTEM DESCRIPTION
OPERATION
HONDA V-MATIC provides variable drive ratios between the engine and rear wheel according t o the engine speed and load. It
accomplishes this with t w o sets of pulleys, drive and driven, connected by a drive belt. The drive pulley is attached t o the
engine crankshaft. The driven pulley is attached t o a shaft that incorporates a centrifugal clutch. In the V-Matic Drive, there is
a final gear reduction between the driven pulley and rear wheel, providing an increase in torque.
BALL BEARING
BALL BEARIN UTCH WEIGHT
\
DRlVE FACE
MOVABLE DRlVE FACE
DRIVE PULLEY DRIVEN PULLEY
When the engine is running at low speed, the unit increases or
multiplies torque. This delivers more torque than a higher
engine speed at a greater drive ratio.
REDUCTION: LOW
DRIVE PULLEY DRIVEN PULLEY
As the engine rpm increases, or the load on the rear wheel
decreases, centrifugal force on the weight rollers throws
the rollers outward. When the rollers are forced outward,
they push the movable face of the drive pulley closer t o the
drive face. The result is a reduced drive ratio between the
driven and drive pulleys.
REDUCTION: HIGH
12-2
Date o f Issue: Sep., 1988
O HONDA MOTOR CO., LTD.