Backstop Clutch Selection Guide
BACKSTOPPING TO PREVENT REVERSE ROTATION
A backstop Cam Clutch is used to prevent the rotating shaft from being driven in the reverse direction. The Cam Clutch will continue overrunning while the shaft rotates and engages to prevent reverse shaft rotation. Normally, the inner race is mounted on the rotating shaft, and the outer race is fixed to the machine frame. The inner race overruns in normal operation. As soon as the shaft begins to rotate in the reverse direction, the cams engage with the inner and outer races to prevent reversing. Figure 8 depicts a typical setup for installing a backstop Cam Clutch. Backstop Cam Clutch Speed Grouping Backstopping Cam Clutches are grouped into three different speed classifications that are dependant on the overrunning speed and load conditions. The following table provides the three different classifications for consideration.
Cam
Free run
Outer race Inner race Torque arm
Figure 8: Typical backstop installation
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