Abstract: A fan shroud for an air cycle machine includes a tubular body extending axially between a first end and a second end of the shroud along a center axis of the fan shroud. A flange extends radially outward from the tubular body of the shroud at the first end of the shroud. At least one mounting hole extends through the flange. A sight hole extends through the flange and is positioned radially inward from the at least one mounting hole relative the center axis.

Abstract: A support bracket having a support portion, a first mounting portion, a second mounting portion, and a first support rib is provided. The first mounting portion extends from a first end of the support portion. The first mounting portion defines a mounting hole. The second mounting portion extends from a second end of the support portion. The second mounting portion has a fifth surface disposed opposite a sixth surface and a fifth side disposed opposite a sixth side. The second mounting portion defines a coupling hole. The first support rib engages a first surface of the support portion and a third surface of the first mounting portion.

Abstract: A support bracket has a support portion, a first mounting portion, and a second mounting portion. The first mounting portion extends from a first end of the support portion. The second mounting portion extends from a second end of the support portion. The second mounting portion defines a coupling hole that is disposed proximate an end surface of the second mounting portion. A first support rib engages a first surface of the support portion and a third surface of the first mounting portion.

Abstract: An aspect is a thrust plate assembly for an air cycle machine. The thrust plate assembly includes an annular body defined by an outer rim and a main bore. The annular body includes a nozzle side and a thrust bearing side. The nozzle side includes a nozzle region proximate the outer rim and a turbine rotor region proximate the main bore, where the outer rim has an outer diameter. The thrust plate assembly also includes a main bore seal installed in the main bore. The main bore seal has an inner diameter, where a ratio of the outer diameter of the outer rim to the inner diameter of the main bore seal is between 3.94 and 3.96.

Abstract: A support bracket has a support portion, a first mounting portion, and a second mounting portion. The first mounting portion extends from a first end of the support portion. The second mounting portion extends from a second end of the support portion. The second mounting portion defines a coupling hole that is disposed proximate an end surface of the second mounting portion. A first support rib engages a first surface of the support portion and a third surface of the first mounting portion.

Abstract: A support bracket includes a base including a first hole and a back plane perpendicular to the base. The support bracket also includes three or more connecting surfaces extending outwardly from a right side of the back plane and a mounting tab extending perpendicularly from an outer surface of the third connecting surface and having a mounting tab hole having a diameter formed therein. The support bracket has a height and a ratio of the diameter of the mounting tab hole to the height of the bracket is between 0.0467 and 0.0469.

Abstract: A support bracket includes a base including a first hole and a backplane perpendicular to the base. The support bracket also includes three or more connecting surfaces extending outwardly from a left side of the back plane and a mounting tab extending perpendicularly form an outer surface of the third connecting surface and having a mounting tab hole having a diameter formed therein. The support bracket has height and a ratio of the diameter of the mounting tab hole to the height of the bracket is between 0.0467 and 0.0469 in.

Abstract: A fan rotor blade extending radially from a hub is described. The fan rotor blade may include first surface and a second surface, where the first surface and second surfaces are respectively defined by a set of X-coordinates, Y-coordinates and Z-coordinates. The X, Y and Z coordinates can be set out in any of Tables T-1, T-2, E-1, and E-2. The X, Y, and Z-coordinates can also be scaled by a predetermined factor, with the X-coordinates are oriented in a tangential direction, the Z-coordinates are oriented in an axial direction, and the Y-coordinates are oriented in a radial direction.

Abstract: A fan shaft for an air cycle machine. The fan shaft includes a body having an axis passing therethrough and a pilot at one end of the body, the body having a first axial length, the pilot having a second axial length, and the pilot defining an inner diameter with respect to the axis and an outer diameter with respect to the axis, wherein the first axial length is 4.215±0.005 inches (10.706±0.013 cm).

Abstract: A compressor housing for an air cycle machine includes an inlet and an outlet. The compressor housing additionally includes a plurality of ribs that extend generally perpendicularly from a surface of the compressor housing. Formed within an internal region of the compressor housing is a bearing support structure. The bearing support structure receives and limits the axial movement of a bearing, seal and at least one O-ring.

Abstract: A cabin air compressor drive ring includes an outer ring defining an axis, an inner ring co-axial with the outer ring, a plurality of webbings connecting the inner ring to the outer ring, and a plurality of vane engagement pins axially protruding from the outer ring. The vane engagement pins are spaced circumferentially about the outer ring, and the inner ring includes a drive ring bearing interface.

Abstract: A vane for a variable diffuser includes a body with an inlet end and an outlet end, a leading surface extending from the inlet end to the outlet end, a trailing surface opposite the leading surface and extending from the inlet end to the outlet end, a first surface extending from the inlet end to the outlet end, and a second surface opposite the first surface and extending from the inlet end to the outlet end. The vane further includes a first cavity on the first surface of the vane adjacent the inlet end, a second cavity on the first surface of the vane adjacent the outlet end, a third cavity on the second surface of the vane adjacent the inlet end, and a fourth cavity on the second surface of the vane adjacent the outlet end.

Abstract: An annular backing plate for a diffuser in a centrifugal compressor comprises an inner diameter and an outer diameter disposed radially opposite the inner diameter. The backing plate also includes a first surface extending between the inner diameter and the outer diameter of the backing plate. A step is formed on the first surface proximate the inner diameter, wherein the step shifts a portion of the first surface encompassed by the step axially aft relative a portion of the first surface not encompassed by the step.

Abstract: An air cycle machine has a housing which holds a compressor section, and a turbine section having an expansion area, and a fan section disposed outside of the housing. A shaft, which attaches to and is coaxial with the compressor section, the turbine section and the fan section, is supported by an air journal bearing and an air thrust bearing. The shaft has a hollow core for porting cooling air from the air journal bearing and the air thrust bearing, and a tube that extends into said expansion area and communicates cooling air from the turbine expansion area to the thrust bearing.

Abstract: A cabin air compressor housing for a cabin air compressor assembly includes a compressor volute configured to direct a compressed flow to a compressor outlet. The cabin air compressor housing also includes a journal bearing support having a journal bearing bore. The cabin air compressor housing further includes an interior portion between the compressor volute and the journal bearing support. The interior portion includes a plurality of cooling airflow holes having a ratio of a diameter of the journal bearing bore to a diameter of one of the cooling airflow holes between 3.64 and 4.52.

Abstract: An example seal shaft includes a cylindrical body establishing a bore that extends axially between a first end portion of the body and a second end portion of the body. Apertures are also established in the body. The apertures extend radially between an outer surface of the body and the bore. The seal shaft further includes a first group knife edge seals and a second group of knife edge seals. The first group of knife edge seals have a diameter, and a ratio of the diameter to the total cross-sectional area of the apertures is between 58.79 and 78.77.

Abstract: An example housing of a cabin air compressor assembly includes a main body portion and a motor outlet duct extending radially from the main body portion. The motor outlet duct interfaces with the main body portion at an interface area. A ratio of a radius of the interface area to an inner diameter of the motor outlet duct is from 0.113 to 0.162.

Abstract: An aspect is a thrust plate assembly for an air cycle machine. The thrust plate assembly includes an annular body defined by an outer rim and a main bore. The annular body includes a nozzle side and a thrust bearing side. The nozzle side includes a nozzle region proximate the outer rim and a turbine rotor region proximate the main bore, where the outer rim has an outer diameter. The thrust plate assembly also includes a main bore seal installed in the main bore. The main bore seal has an inner diameter, where a ratio of the outer diameter of the outer rim to the inner diameter of the main bore seal is between 3.94 and 3.96.

Abstract: A housing of an air cycle machine includes a static seal portion, a main bore housing portion, a shroud pilot housing portion, and a thrust plate housing portion. The static seal portion is arranged about a central axis and defines static seal radius D1. The main bore housing portion is arranged about the central axis and circumscribes the shaft arranged along the central axis. The main bore housing defines central bore inner radius D2. The shroud pilot housing radius is arranged about the central axis and defines shroud pilot radius D3. The thrust plate housing portion is arranged about the central axis and defines insulator seal plate radius D4. A ratio D1/D2 is 0.8394 to 0.8416, a ratio D1/D3 is 0.4315 to 0.4322, a ratio D1/D4 is 0.2517 to 0.2521, a ratio D2/D3 is 0.5130 to 0.5146, a ratio D2/D4 is 0.2993-0.3001, and a ratio D3/D4 is 0.5828-0.5838.

Abstract: Disclosed is a bearing sleeve for supporting a shaft of an air cycle machine. The bearing sleeve includes an outer diameter and an inner diameter. The outer diameter is within a range of 3.222 and 3.224 inches. Further included is a foil retaining cavity provided in the inner diameter of the sleeve. The foil retaining cavity includes a slot and first and second openings located at opposing axial ends of the slot. Each of the first and second openings include a small portion and a large portion having different axial lengths. A ratio of the combined axial lengths of the large portions to an axial length of the foil retaining cavity is within a range of 0.19:1 and 0.22:1.