Gear wheel

A gear box for driving a fan of a gas turbine engine at a lower rotational speed than a core shaft of the gas turbine engine, wherein the gear box comprises:

• a toothed gear which comprises a rim, on which a toothing with a plurality of teeth is positioned,
• a support point, and
• a web via which the rim is connected to the support point,
• wherein a geometry variation and/or material variation is provided at a side of the rim that is situated opposite the toothing and adjacent to the web, and
• wherein the rim has an increasing radial rim thickness with an increasing axial distance from the web;
• wherein, to form the geometry variation, a region projecting inward from the rim is formed under a respective tooth space between two adjacent ones of the teeth,
• wherein two adjacent inwardly projecting regions have a same angular spacing to one another as two adjacent ones of the tooth spaces positioned radially outwardly.

A toothed gear for a gear box, comprising:

• a rim on which a toothing with a plurality of teeth is positioned,
• a support point,
• a web via which the rim is connected to the support point,
• wherein, at a side of the rim that is situated opposite the toothing and adjacent to the web, a periodic geometry variation is formed which is aligned with the teeth of the toothing;
• and
• wherein the rim is arranged unilaterally toward a first side of the toothed gear and does not protrude from an opposite second side of the toothed gear;
• wherein, to form the geometry variation, a region projecting inward from the rim is formed under a respective tooth space between two adjacent ones of the teeth,
• wherein two adjacent inwardly projecting regions have a same angular spacing to one another as two adjacent ones of the tooth spaces positioned radially outwardly.