Straight bevel gears are the simplest of the bevel gears. They are
manufactured on precision generating machines by indexing method
ensuring that the teeth should be of tapered depth and thickness. Teeth
are cut on the outside of the cone. They have a straight tooth geometry,
which if extends, passes through the intersection of their axes. Straight bevel angle can also be with one gear flat with a pitch angle of 90 degrees. These have conical pith surfaces that operate on intersecting axes. They can be designed and cut to operate on any shaft angle. In straight bevel gears when each tooth engages it impacts the corresponding tooth and simply curving the gear teeth can solve the problem.
Straight bevel gears come in two variations depending on the fabrication equipment. They are grouped into Gleason type and the standard type. Major percentage of them is of Gleason type with a coniflex form that gives almost an imperceptible convex appearance to the tooth surface. In the standard form, the gear has no profile shifted tooth.
These gears are recommended at less speed and when loads are light. At higher speed they make noise. The most preeminent function of these gears is in a bevel gear differential. Straight tooth gears are also used in chemical industries, steel plant, machine tools, cement plant, textile processing, material handling system, sugar mills and cooling towers etc.