The invention describes a power-split continuously variable transmission apparatus (1) having a summing planetary transmission (9), having at least one further planetary gear set (10) and having a variator (8), which are operatively connected to one another in the region of shafts (11, 12, 13, 14) and can be coupled to one another in the region of further shafts (15, 16, 11, 18, 14) by means of shift elements (S1 to S3) in order to realize at least three transmission ratio ranges. Within the transmission ratio ranges, a transmission ratio can be varied in continuous fashion by way of the variator (8). The variator (8) is in the form of a mechanical friction-wheel variator with at least three shafts (11, 15, 17). The summing planetary transmission (9), the at least one further planetary gear set (10) and the variator (8) are arranged coaxially with respect to one another. In one of the transmission ratio ranges, all of the power can be conducted between a transmission input shaft (2) and a transmission output shaft (7) via the variator (8). Furthermore, a friction wheel of the variator (8) is of at least approximately conical form at least in regions.