Environmental control system utilizing integrated vapor compression system and four-wheel air cycle machine

Abstract

An environmental control system (ECS) of an aircraft, having a case; a vaper compression system (VCS) having a compressor and a driven shaft coupled to the compressor, wherein the compressor and the driven shaft are sealed within the case; and a four-wheel air cycle machine (ACM) including a first turbine and a drive shaft coupled to the first turbine and which are outside the case, a second turbine connected to the first turbine via a second shaft, a second compressor connected to the second turbine via a third shaft, and a fan connected to the second compressor via a fourth shaft, wherein the drive shaft and the driven shaft are coupled to each other via a coupling.

Dependencies are inferred from the claim text.