CAM CLUTCH BASICS
DISPLACEMENT OF CONTACT POINT FUNCTION
Rollers function as bearings and orbit while rotating on their axis, and supporting the outer race. There is a slight clearance between the rollers, the inner and outer races; therefore the bottom of the cam space between the inner and outer races is slightly wider compared with the top. Cams always maintain contact by spring force, and the slant of the cams is automatically different at the top and the bottom. Cams continuously orbit by changing the contact point with the inner and outer races; therefore the wear on cams due to overrunning is diminished to the minimum, and the overrunning wear life on the Cam Clutch is at the maximum length.
BS/BS-F Series
Slightly narrow
Outer race
Inner race
Different inclination
Slightly wide
For the conveyor, which is always in an overrunning condition during the operation, as well as the self- lubrication function and the sliding speed diminishing function, it is one of the major features of a cam and roller cage to realize a long operating life. Tsubaki BS and BS-F Cam Clutch compared with Ramp & Roller Clutch Cam Clutch cams slide on the outer circumference of the inner race (Di) at the decelerated sliding speed due to the sliding speed diminishing function described above. The contact force of cams and inner and outer
races are given only by spring force (Ps). As for the Roller Clutches, rollers slide in the inner circumference of the outer race (Do) because rollers are built onto a roller cage which is connected with the inner race. Therefore the sliding speed of the Roller Clutch is faster when compared with that of the Cam Clutch between the cams and inner race. In addition, the contact force of rollers and the outer race is quite large in the Ramp & Roller design because the centrifugal force (Pc) caused by the rotation of the roller cage is added to the spring force (Ps). The BS Cam Clutches overrun with low sliding speed and low contact force, thus the BS Cam Clutches have a long overrunning wear life when compared with the Roller Clutches.
Cam Clutch
Roller Clutch
P s
P c
F
P s
V 2
D o
D i
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