F. Gear Mechanisms
Gear is a wheel with teeth on its surface designed
to mesh with another gear or rack. The meshing of two gears constitutes
a gear pair. The gear mechanism is a mechanism containing
at least one toothed link. Gear mechanisms are in general used to transmit the
motion of revolutions between two shafts in which the transmission ratio
is constant. Since gear mechanisms have the advantages of high transmission
efficiency, compact structures, and easy manufacture, they are broadly used
in many mechanical transmissions.