Ezgo 1600xd Repair Manual page 143

A
5
6
1
7
Drive pulley
※ For the driving pulley, the flange (8) and shaft (9) shown in blue rotate engaged to the engine flywheel while the
flange (4) and centrifugal pendulum (1) shown in red rotate sliding on the shaft (9) in the axial direction as one unit.
B
Drive pulley
※ For the driven pulley, the section shown in blue rotates engaged to the input shaft of the transmission while the
section shown in red rotates sliding on the shaft in the axial direction as one unit.
(1) centrifugal pendulum
(2) spring
CVT pulley operation under no load conditions
• Neutral state (A)
When the engine is running at a low speed below approx.
1300 RPM, the centrifugal force of the centrifugal pen-
dulum (A1) attached to the flywheel of the engine cannot
overcome the elastic force of the returning spring (A3).
Then, the outer flange (A4) of the driving pulley is contin-
ued to be fully extended by the return spring(3) as shown
in the figure and the belt (A5) does not contact with the
flange of the pulley, resulting in no transmission of the en-
gine power to the driven pulley.
• Engine starting (A)
When the engine speed is increased to a speed over
approx. 1300 RPM, the centrifugal pendulum (A1) at-
tached to the driving pulley moves outward pivoting
from the hinge shaft (A6), pushing the roller (A7). Then,
the reaction from this force moves the outer flange (A4)
toward the inner flange (A8) and then the belt (A5) be-
tween the flanges is compressed, starting to run.
SUUV-W00 Apr. 2011
CVT - STRUCTURE AND OPERATING PRINCIPLE
9
8
4
3
1
(3) returning spring (5) belt
(4) outer fl ange (6) hinge shaft
Driven pulley
Driven pulley
(7) roller
(8) inner fl ange
• Acceleration under no load (B)
When the engine speed is increased further, the cen-
trifugal pendulum (B1) of the driving pulley moves out-
ward further, the flanges on both sides become closer
to each other and then the contact point of the belt and
flange moves toward the circumference of the pulley.
When the engine speed rises to approx. 2200 RPM,
the flanges of the driving pulleys become very close to
each other and the effective diameter of the belt on the
driving pulley side becomes maximum. As the effec-
tive belt diameter on the driving pulley side increases
and the belt is not extended, the effective belt diameter
on the driven pulley side decreases inversely and the
flanges on the driven pulley become farther from each
other.
2
UUVW316A
(9) shaft
4
-5