The toothed discs (31-42) of the conical gear wheels are separate or integrated and are combined on the same cone axis so that the gaps between teeth are behind each other. Rotary double spherical teeth (17,18) run along grooves. The cone pinion (15) has double-spherical shaped teeth. Small rods (18) matching the number of double-spherical teeth have one end on a central rotary spherical bushing (19) mounted on a shaft (14). The second end passes through a core hole.
