Bearing arrangement for air cycle machine

A journal bearing for a rotatable shaft of an air cycle machine, comprising:

• a journal bearing housing;
• a journal bearing shell positioned in said housing, wherein said shell includes:
• a single piece body structure having a first half integral with a second half, disposed along a common axis wherein said first half is adapted to receive a first hydrodynamic fluid bearing means an said second half is adapted to receive a second hydrodynamic fluid bearing means, wherein said first half includes a first outside end and said second half includes a second outside end, and wherein said first half is sufficiently spaced from said second half for supporting and aligning said first and second hydrodynamic fluid bearing means along said common axis for supporting said rotatable shaft, said first and second integral halves defining a continuously formed inner diameter adapted to receive said first and second hydrodynamic fluid bearing means between said rotatable shaft and said inner diameter for facilitating rotation of the shaft relative to said body structure, wherein said continuously formed inner diameter extends from said first outside end to said second outside end;
• and
• an outer surface for placement and securement in the journal bearing housing of the air cycle machine.