Gear geometry with fluid reservoir and fluid paths

A gear box to transmit torque from an engine to a driven element, the gear box comprising:

• a gear train configured to transmit the torque from the engine to the driven element, the gear train including a gear comprising:
• a body having an axis of rotation, an axial face oriented transversely with respect to the axis and a radial face oriented transversely with respect to the axial face,
• the axial face being formed to define a fluid reservoir, and
• fluid paths defined in the body extending from the fluid reservoir to the radial face and being rotatable about the axis to encourage a flow of fluid from the fluid reservoir, through the holes and to the radial face.

A gear, comprising:

• an annular body having a poloidal axis, opposed axial faces oriented transversely with respect to the poloidal axis and inward and outward radial faces extending between the first and second axial faces,
• an aperture in the radial face extending between the first and second axial faces,
• a rim included in at least one of the axial faces and a first channel recessed from a plane of the rim in a direction defined along the poloidal axis and shaped to hold a fluid, and
• holes in the annular body defining fluid paths extending from the first channel to the outward radial face such that the fluid passes from the first channel though the fluid paths when the gear is rotated.