7.3 PATH OF POWER TRANSMISSION
The torque of crank-shaft drive the front pulley
The torque (drive) pulley turn the belt
The belt drive the rear (driven) pulley
The force through the clutch shoe, clutch housing and drive shaft
The drive shaft turn the idle gear in gearbox
Turning speed reduced by final-gear and transmitted to rear-axle shaft to move rear wheel
7.4 AUTOMATIC CONTINUOUS VARIABLE TRANSMISSION
This transmission is the combination of automatic centrifugal
clutch and V-belt continuous variable transmission, which can
change the transmission ratio automatically.
When engine speed increase, the drive pulley will be push to
belt by the centrifugal force from six rollers.
Then the pitch circle of belt in drive pulley will be larger.
The belt at driven pulley is forced to move to the center of
shaft, then the radius of pitch circle is decreased.
The transmission ratio is therefore altered by the alteration of
pitch circle’s radius.
(In the drawing, “H” means high speed, “L” means low speed)
7.5 CONTINUOUS VARIABLE TRANSMISSION
V-Belt
Made of rubber fiber, resistant to head, pressure and abrasion.
The inner side of the Belt is toothed.
Drive Pulley
Due to the increasing engine speed, the rollers push
the movable drive face by centrifugal force. Then the belt is
pressed and enlarge its turning radius.
The aluminum fan is installed on the exterior of
fixed drive face. It can reduce the belt temperature.
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