Parallel Axis Gears - Gear Nomenclature
Gears are generally classified by the positional relationship (arrangement) of the two axes of a pair of gears.
They can be classified as parallel axis gears, intersecting axis gears, and nonparallel and nonintersecting axis gears.
Parallel axis gear is a general term for gears that transmit power between parallel shafts.
These include most types of cylindrical gears such as spur and helical gears, straight and helical gear racks, and even internal gears.
The meshing of gear pairs in parallel axis creates a rolling contact, which results in high transmission efficiency ranging from 98.0 ~ 99.5 % efficiency.
