Mating spur gears

A pair of mating spur gear elements having substantially parallel gear axes and produced by cutting out the tooth gaps with an end cutter head element, wherein there is imparted to one of the elements--the spur gear element or the end cutter head element--an arcuate-shaped generating movement about an axis in order to produce one of the spur gear elements, said axis at least approximately coinciding with the spur gear axis of the mating gear element, the mating gear element is produced by a plunge cut operation without any generating movement, wherein the teeth of the one spur gear element possess an involute-shaped tooth depth profile and the teeth of the mating gear element possess a straight tooth depth profile, and the teeth of both spur gear elements are curved in substantially cycloidal-shape in the lengthwise direction of the teeth.