Overrunning Clutch Selection Guide
OVERRUNNING: DUAL DRIVE AND TWO SPEED DRIVE Dual Drive is a system that utilizes two sets of driving units to propel a driven unit. Dual drive systems often have two drives that rotate at different speeds; these are referred to as two speed drive systems. In a two speed drive system, it is common to operate at two different speeds; high speed and low speed. Normally, each drive system utilizes a Cam Clutch that acts as an automatic switching device. In Figure 22 , when the driven unit is propelled by Driving Unit A (in the direction of the arrow), Cam Clutch A engages to transmit torque from the outer race to the inner race, resulting in rotation at a pre-set speed. At the same time, since the inner race of Cam Clutch B is also rotating in the same direction, it does not engage but overruns. The end result is Driving Unit B is disconnected from the Driven Unit. Conversely, when the Driven Unit is to be propelled by Driving Unit B, Cam Clutch B engages to transmit torque of the outer race to the inner race, resulting in rotation of the Driven Unit at a pre-set speed. At this time, Cam Clutch A overruns to disconnect Driving Unit A.
Cam
Cam
Outer race
Outer race
Driving unit A
Driving unit B
Driven unit
Inner race
Inner race
A Driving unit
A Cam clutch
B Cam clutch
B Driving unit
Driven unit
Figure 22: Dual Speed Drive System with Overrunning Cam Clutch
Overrunning Cam Clutch applications are divided into four types as depicted below. When selecting an overrunning Cam Clutch, one must consider the overrunning speed and engaging speed.
Application
Overrunning Speed
Engaging Speed
Applicable Series
High-speed overrunning and high-speed engagement High-speed overrunning and medium or low-speed engagement High-speed overrunning and low-speed engagement Medium and low-speed overrunning and medium and low-speed engagement
Cam Clutch Box MZEU, MZ Series Cam Clutch Box MZEU, MZ Series Cam Clutch Box BREU, BR-HT MZEU, MZ Series MZEU, MZ Series MGUS Series PBUS, BUS200
700 RPM and up
700 RPM and up
700 RPM and up
up to 700 RPM
700 RPM and up
Up to 200 RPM
up to 700 RPM
up to 700 RPM
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