Which gear type is spur?

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Spur gears are the simplest type, featuring straight teeth that run parallel to the gear’s axis on a cylindrical gear. This design meshes between shafts that are parallel, delivering a straightforward, direct power transfer. That straight, parallel-to-axis tooth arrangement distinguishes spur gears from the others: bevel gears have teeth on a conical surface to change direction between intersecting shafts; helical gears cut teeth at an angle for smoother contact; worm gears use a screw-like gear pair for high reduction and non-backdrivability. So the gear with straight, parallel teeth on a cylindrical body is the spur type.