The invention relates to a one-piece gear (1) made of plastic, having an axis of rotation (R), external toothing (10) arranged about an axis of rotation, a concentrically arranged receiving opening (40), an intermediate portion (30) arranged between the external toothing (10) and the receiving opening (40), a reinforcing structure arranged in the intermediate portion (30) having a plurality of openings (32, 33) and reinforcing ribs (34, 35) disposed between the openings, characterized by the following additional features: the external toothing (10) is designed as a helical toothing with a helix angle (W) to the axis of rotation (R), at least some of the openings (32, 33) follow at least approximately the helix angle (W) of the helical toothing with an opening angle (V).

The invention also relates to a method for producing such a gear.