Patent ID: 11920488
Assignee: HAMILTON SUNDSTRAND CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B  Y | IPC B  F

Claim 0:
1. An air cycle machine, comprising:
a compressor housing a compressor rotor;
a turbine housing having a turbine rotor, a journal bearing bore and a journal bearing disposed in the journal bearing bore;
an air bearing shaft, wherein the air bearing shaft rotates in the journal bearing, wherein the turbine rotor and the compressor rotor are axially connected via the air bearing shaft, and
wherein the turbine housing is a repaired turbine housing, wherein:
the journal bearing bore has an inlet, an outlet, and an inner diameter of 2.580±0.001 inches (6.553±0.003 centimeters), and
a cylindrical insert is secured within the journal bearing bore and having a first end, a second end, an inner surface, a step located at the first end, and an outer surface with an outer diameter that provides a diametric interference with the inner diameter of the journal bearing bore, the diametric interference being between 0.000-0.003 inches (0.000-0.008 centimeters), the cylindrical insert being inserted into the inlet of the journal bearing bore up to the step so that the step is outside of the journal bearing bore,
wherein:
the step has an outer diameter that is greater than the outer diameter of the cylindrical insert;
the inner surface of the cylindrical insert includes at least one selected inner diameter;
the repaired turbine housing has undergone a stress relief by heating the repaired turbine housing with the cylindrical insert secured within the journal bearing bore;
the inner surface of the cylindrical insert includes a first seal groove and a second seal groove, the first seal groove has a first seal groove diameter of 2.424±0.002 inches (6.157±0.005 centimeters) and the second seal groove has a second seal groove diameter of 2.424±0.002 inches (6.157±0.005 centimeters);
the first seal groove includes an inward edge and an outward edge, wherein the outward edge of the first seal groove is located at a distance of 3.23±0.005 inches (8.204±0.013 centimeters) away from the outlet; and
the second seal groove includes an inward edge and an outward edge, wherein the inward edge of the second seal groove is located at a distance of 1.5±0.005 inches (3.810±0.013 centimeters) away from the outlet.