ABSTRACT
Intersected-axis gears have been used in practice for centuries. Numerous designs of intersected-axis gears can be found in Leonardo da Vinci’s famous book, The Madrid Codices (1974). When motion is to be transmitted between shafts whose axes intersect, some form of bevel gear is applied. Although bevel gears are often made for a shaft angle of 90, they can be produced for almost any shaft angle. The discussion of intersected-axis gears begins below from the consideration of the earliest concepts of gear pairs of this particular kind.
