Pinion of a turbine engine shaft having a web comprising a cross-linked structure

A pinion for an aircraft turbomachine gear train,

• the pinion comprising:
• a cylindrical body extending along an axis and configured to engage with a shaft received in the cylindrical body,
• a rim concentric with the cylindrical body, and
• a web delimited axially by a front wall and a rear wall and extending radially from the cylindrical body to the rim, each of the front and rear walls having a density,
• wherein the web comprises a cross-linked structure around the cylindrical body between the front wall and the rear wall,
• the cross-linked structure comprising a unit cell repeated along three axes of a three-dimensional coordinate system,
• a density of the unit cell being strictly less than each of the densities of the front and rear walls,
• wherein the rim comprises a cantilever extending axially beyond the front wall or beyond the rear wall, and
• wherein an average axial width of the cantilever is less than 80% of an average axial width of the rim.

A manufacturing method for a pinion for an aircraft turbomachine gear train,

• the method comprising successive steps of:
• obtaining (E2) a cylindrical body of the pinion;
• obtaining (E3) a front wall of a web of the pinion and obtaining a rim which has material continuity with the front wall, the front wall having a density;
• positioning (E4) against the front wall a cross-linked structure comprising a repetition of a unit cell along three axes of a three-dimensional coordinate system, a density of the unit cell being strictly less than the density of the front wall;
• and
• obtaining (E5) a rear wall of the web of the pinion against the cross-linked structure, a material of the rear wall having a density strictly greater than the density of the cross-linked structure,
• the cylindrical body, the front and rear walls of the web and the rim being obtained in a single piece by additive manufacturing,
• the web incorporating the cross-linked structure,
• wherein a ratio between a volume of the unit cell of the cross-linked structure and the total volume occupied by the unit cell of the cross-linked structure is less than or equal to 5%.