mAINTENANCE (old style clutch)
|
|
| MOVEABLE FACE |
|
|
| IS CONTROLLED |
| CENTRIFUGAL FORCE | BY A SPRING | |
| AND BELT TENSION | ||
DISTANCE | DRIVE | LOW OUTPUT | |
| SPEED | ||
MOVEABLE | PULLEY |
|
|
|
|
| |
FACE |
|
|
|
TRAVELS |
|
|
|
| LOW ENGINE RPM |
| |
|
| DRIVEN PULLEY | |
MOVABLE FACE IS |
| HIGH OUTPUT | |
CONTROLLED BY | DRIVE | SPEED | |
ROLLER WEIGHT ARMS | PULLEY |
| |
AND SPRINGS
HIGH ENGINE RPM
DRIVEN PULLEY
Figure 24. Pulley Interaction
The "Variable Pitch Pulleys" have one fixed face, and one moveable face.The drive pulley moveable face is controlled by roller weight arms and springs, which change position according to engine speed. The driven pulley moveable face is controlled by a spring and belt tension. (Figure 25)
DRIVE PULLEY
RAMP
PLATE
BUSHING
SPRING
ROLLER ARM 
WEIGHT
Figure 25. Variable Pitch Pulley
How It Works (Figure 25)
Condition A:
•Engine Idling
•Drive Pulley: Small
•Driven Pulley: Large
•Belt: Loose and Stationary
Condition B:
•Engine Accelerating
•Drive Pulley: Small But Increasing
•Driven Pulley: Large But Decreasing
•Belt: Approaching Tightness
Condition C:
•Engine At High Speed
•Drive Pulley: Large
•Driven Pulley: Small
•Belt: Tight
A B C
1
2
3 | 4 | 5 |
Figure 26. Pulley Conditions
page 32 — HHXg5
