CAM CLUTCH BASICS 3. Overrunning Clutches used in this type of application overrun at either the inner or outer race during the majority of the clutch operating time, and are occasionally called upon to lock up and drive. A typical application is a two-speed drive, where an electric motor and a geared motor are connected to a single driven shaft through one-way clutches. The machine can be driven by either the electric motor or geared motor. When the geared motor drives at low speed, the clutch engages. When the faster turning electric motor drives the machine, the clutch overruns. The clutch automatically switches between low speed and high speed. Please reference Figure 3 for an example of a typical overrunning application.
Figure 3: General Overrunning application example
Overrunning Application & Selection begins on page 23.
Application
Characteristics
Cam Clutch Model Options
High speed overrun, High speed engagement High speed overrun, Low to medium speed engagement High speed overrun, Low speed engagement
OVERRUNNING: 700 r/min and up ENGAGEMENT: 700 r/min and up OVERRUNNING: 700 r/min and up ENGAGEMENT: Up to 700 r/min OVERRUNNING: 700 r/min and up ENGAGEMENT: Up to 200 r/min OVERRUNNING: Up to 700 r/min ENGAGEMENT: Up to 700 r/min
MZEU, MZ, OB-series
Dual drive and two speed drive
MZEU, MZ, OB-series
MZEU, MZ, BREU, BR-HT, OB-series
Low to medium speed overrun, Low speed engagement
BB, PBUS, MGUS, MZEU, TFS, TSS, BUS200, MZ BB, PBUS, MGUS, MIUS, MZEU, TFS, TSS, BUS200, MZ
Overrunning when rotating speed of driven side becomes faster than the driving side
Free wheeling
Continuous overrunning, manual engagement Engage in one direction, Overrun in reverse direction
Manual drive
BB, PBUS, MZ, MIUS, MZEU, TFS, TSS, BUS200
Normal engagement and reverse overrunning
BB, PBUS, MGUS, MIUS, MZEU, TFS, TSS, BUS200
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