Driven Clutch Operation
The operation of the driven clutch is affected by trans-
axle load. When the vehicle is stopped, the drive belt is
held at the outer diameter of the driven clutch sheaves
from the pressure of the spring pushing the moveable
sheave against the fixed sheave and away from the
fixed cam. Three sets of buttons on the moveable
sheaveprovidealowfrictionsurfaceonwhichthemove-
able sheave can slide on the ramp of the fixed cam.
1
5
2
Once the drive belt starts rotating, the driven clutch also
starts to rotate. With increasing speed of the drive
clutch, the drive belt begins to climb to the outer diame-
ter of the drive clutch sheaves. This increases the ten-
sion on the drive belt, and forces the moveable sheave
of the driven clutch to move away from the fixed sheave
against the pressure of the spring. As the belt tightens
andthesheavesopenup,thedrivebeltrideslowerinthe
driven clutch sheaves.
4
3
Figure 3
1.
2.
3.
Moveable sheave
Ramp (fixed cam)
Button
4.
5.
Fixed sheave
Drive belt
With increased load to the transaxle, the fixed cam re-
sists forward movement relative to the moveable
sheave and drive belt. Torque from the drive belt and
springpressuremovesthemovablesheaveuptheramp
of the fixed cam. The drive belt becomes positioned
closer to the outer diameter of the driven clutch
sheaves.
1
5
2
3
4
Figure 4
1.
2.
3.
Moveable sheave
Ramp (fixed cam)
Button
4.
5.
Fixed sheave
Spring
Workman MD/MDX
Page 5 -- 5
Drive Train
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