Drive Clutch Operation
1
2
3
4
5
6
v
7
8
9
Figure 2
1.
2.
3.
Fixed sheave
Moveable sheave
Spider assembly
4.
5.
6.
Cover
Washer
Plastic cap
7.
8.
9.
Spring
Cam weight (3 used)
Roller (3 used)
The operation of the drive clutch is affected by engine
shaft speed. With the engine not turning, the drive belt
restslowwithinthedriveclutchsheaves asthepressure
of the spring holds the sheaves apart. As the engine in-
creases in speed, the cams attached to the moveable
sheave move outward as they spin about the engine
driveshaft.Theoutwardmovementofthecamspresses
against the rollers and overcomes spring pressure
through the spider assembly, which forces the move-
able sheave closer to the fixed sheave. This inward
movement of the sheave engages the drive belt.
With increasing engine speed, the moveable sheave
continues to move inward, which forces the drive belt to
ride towards the outer diameter of the clutch sheaves.
When engine speed is decreased, the cams exert less
force on the rollers and thus the spring. The spring pres-
sure overcomes the force of the cams, and shifts the
moveable sheave away from the fixed sheave. The
drive belt disengages from the clutch sheaves at a point
where the force of the spring is greater than that of the
weights.
Drive Train
Page 5 -- 4
Workman MD/MDX
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