CAM CLUTCH BASICS
OPERATING PRINCIPLES
1
O'
The outer race's rotation is stopped by the torque arm. Cams contact with the inner and outer races at points A and B respectively. AB maintains a constant engagement angle (strut angle º) with the center line O-O'. The strut angle is an integral part of the overrunning and engagement function of the BS Cam Clutch. See 1.
Outer race
A
Cam
Spring
B
Inner race
Strut angle(º)
O
Springs give the rotational moment of F to cams ensuring precise contact is maintained between the inner and outer races. When the inner race (conveyor shaft) rotates in the direction of the black arrow, the inner race overruns smoothly because AB does not act as a strut. At this time, cams maintain light contact due to the spring force. See 2.
2
F
F
Cam
Spring
3
O'
Outer race
A
When the conveyor stops and the inner race (conveyor shaft) rotates in the direction of the white arrow, the inner race is locked immediately by the cams because AB acts as a strut, and prevents the conveyor from rotating in reverse. See 3.
Spring
F
B
Strut angle(º)
Inner race
O
Overrunning
Engagement
Self-lubrication function When the inner race overruns, rollers also rotate so the cam and roller cage orbit around the outer circumference of the inner race at low speed. Grease in the cam and roller cage spreads completely throughout the insides of the Cam Clutch due to the orbital motion, thus maintaining good lubrication.
V 2
Roller
Cam
V 1
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