The main function of Bevel Gears is to change the direction of the shaft’s rotation. Bevel Gears are always connecting with the shafts. Despite of these shafts are 90 degrees away from each other, they can work in all angles. The Bevel Gears have teeth as:
In Bevel Gears have Straight and Spiral then the shafts must be in vertical position and they all must exists in the same surface.