Cover for rotatable shaft of gas turbine engine

A gas turbine engine, comprising:

• a rotatable shaft;
• and
• a cover substantially covering an end of the rotatable shaft, the cover including a passageway fluidly coupled from outside the rotatable shaft to inside the rotatable shaft, the cover further including a fin configured to prevent oil from entering the passageway,
• wherein the cover includes a wall covering substantially the entire end of the rotatable shaft,
• wherein the wall includes an outer surface facing outside the rotatable shaft and an inner surface facing inside the rotatable shaft,
• wherein the cover includes a hub projecting from the inner surface of the wall,
• wherein the passageway includes an axial section extending along an engine central longitudinal axis from the outer surface to a location within the hub,
• wherein the passageway includes a plurality of radial sections extending in a direction substantially perpendicular to the engine central longitudinal axis between the axial section and an outer diameter of the hub,
• wherein the outer diameter of the hub provides the fin,
• wherein the outer diameter of the hub adjacent the fin has a greater radial dimension than the outer diameter of the hub adjacent the plurality of radial sections,
• wherein the fin is axially between the plurality of radial sections and the inner surface of the wall,
• wherein the fin is a first fin and the hub further includes a second fin,
• wherein the radial sections are axially between the first and second fins,
• wherein the outer diameter of the hub provides a first channel between the first fin and the inner surface of the wall and a second channel between the first and second fins,
• wherein the first and second channels are substantially concave from a radially outer perspective, and
• wherein bases of the first and second channels are defined by respective radii having origins on a centerline of a respective one of the first channel and the second channel.

A gas turbine engine, comprising:

• a rotatable shaft;
• and
• a cover substantially covering an end of the rotatable shaft, the cover including a passageway fluidly coupled from outside the rotatable shaft to inside the rotatable shaft, the cover further including a fin configured to prevent oil from entering the passageway,
• wherein the cover includes a wall covering substantially the entire end of the rotatable shaft,
• wherein the wall includes an outer surface facing outside the rotatable shaft and an inner surface facing inside the rotatable shaft,
• wherein the cover includes a hub projecting from the inner surface of the wall,
• wherein the passageway includes an axial section extending along an engine central longitudinal axis from the outer surface to a location within the hub,
• wherein the passageway includes a plurality of radial sections extending in a direction substantially perpendicular to the engine central longitudinal axis between the axial section and an outer diameter of the hub,
• wherein the outer diameter of the hub provides the fin,
• wherein the outer diameter of the hub adjacent the fin has a greater radial dimension than the outer diameter of the hub adjacent the plurality of radial sections,
• wherein the fin is axially between the plurality of radial sections and the inner surface of the wall,
• wherein the fin is a first fin and the hub further includes a second fin,
• wherein the radial sections are axially between the first and second fins,
• wherein the outer diameter of the hub provides a first channel between the first fin and the inner surface of the wall and a second channel between the first and second fins,
• wherein centerlines of the radial sections are concentric with a centerline of the second channel, and
• wherein the second channel includes a raised center section such that a minimum radial dimension of the outer diameter of the hub is spaced-apart from the centerline of the second channel.