Overrunning Clutch Selection Guide
FREEWHEELING
To prevent differences in the rotating speed between the driving side and the driven side from damaging the equipment or the product, the Cam Clutch over- runs when speed differences occur. Normally, the Cam Clutch engages to transmit torque, and it over- runs to break the connection between the driving side and the driven side. In this case the Cam Clutch overruns at a speed equal to the difference in rotating speed that occurs when the driven unit (normally the inner race) rotates faster than the driving unit (normally the outer race), or when the driving unit is decelerated or stopped abruptly. When feeding hoop-shaped material or plate material to the next process by slitter or pressure rolls, the material is fed at first by pinch rolls up to the main rolls. Since the main rolls process the material while pulling it at a speed faster than that of the pinch rolls, the pinch rolls are pulled by the material. At this point, the Cam Clutch starts to overrun and prevents the pinch rolls from being driven in reverse by the material. The Cam Clutch is used to prevent damage to the pinch roll driving parts and to the material, due to slippage between the pinch rolls. This method is also used with drying machines, engine testers, and plywood fabricating machines. Please reference Figure 29.
Pinch Roll
Main Roll
Cam Clutch
Gear Motor
Figure 29: Feed roll – medium overrunning application
Typical Series
Advantage
MZ, MZEU
Grease is sealed in, so lubrication maintenance is not required
MGUS
Compact and transmits high torque
BB
Integrated Cam Clutch and bearing
MIUS
Excellent response to load change
TFS, TSS
Outside dimensions same as standard ball bearing type bearing
PBUS
Easy mounting of gears, pulleys, and sprockets
BUS200
With or without inner race for machine integration
28
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