Backstop Clutch Selection Guide
BACKSTOPPING FOR LOW SPEED OVERRUNNING (OVERRUNNING AT 150 RPM OR LESS)
In this application, the inner race is mounted directly onto the conveyor head pulley, or driven shaft. The outer race is connected to the conveyor frame to prevent reverse rotation. Since reverse rotation is prevented directly by the conveyor shaft without using a drive chain, gears, or couplings, this is regarded as the safest and most reliable mounting method. Furthermore, due to the fact that the Cam Clutch is connected to the conveyor pulley, low overrunning slip speed is reduced, as well as the slipping distance. The result is reduced wear and long service life. In addition to conveyor systems, this system is also used to prevent reverse rotation on inclined and screw type pumps. Please see Figure 10 for an illustration of mounting.
Typical Series
Advantages
• Designed specifically for conveyor applications • Dust-proof enclosure • Virtually maintenance-free
BS/BS-F/BSEU
Figure 10: BS Series mounting low speed
BACKSTOPPING FOR MEDIUM SPEED OVERRUNNING (150 TO 700 RPM) In this application, the Cam Clutch is mounted on a gear reducer shaft rotating at medium speeds to prevent reverse rotation. As speed increases, the torque required to maintain the load at a given rate decreases. Therefore, the Cam Clutch required only needs to withstand a comparatively small torque that is inversely proportional to the rotating speed ratio of the reducer output shaft. Considering the application requirements, even a small Cam Clutch can be utilized in this application. Figure 11 provides an illustration of how the Cam Clutch could be mounted for this particular application.
Typical Series
Advantages
Cam Clutch
• Compact design can handle high torque • Excellent wear characteristics
MGUS/MGUS-R
Reducer
Motor
Figure 11: MGUS Series mounting medium speed
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