pitch circle diameter x cos ?

addendum circle diameter x cos ?

clearance circle diameter x cos ?

pitch circle diameter x sin ?

Crossed flat belt drive

Rope drive

V-belt drive

Chain drive

(k1k2)/(k1+k2)

(k1-k2)/(k1+k2)

(k1+k2)/(k1+k2)

(k1-k2)/(k1k2)

constant period

fixed period

dwell period

idle period

surface of the top of the tooth

surface of the tooth above the pitch surface

surface of the tooth below the pitch surface

width of the tooth measured along the pitch circle