assumed to take place the working substance is intended to flow via the high pressure inlet 19 into the inner expansion side pressure chamber 33 b of the expander part in housing half 7 b the drive shaft is guided by means of a journal bearing 9 b which is supported on housing half 7 b via a bearing seat 52 b with the ribs 29 b between the ribs are the apertures 6 b which create the access of the working substance into the expansion side pressure chamber 33 b the disk 2 is guided on the eccentric disk 23 via the eccentric bearing 17 onto which the hub 4 is mounted and which is sealed off from the pressure chambers 33 a and 33 b for example with shaft seals 18 reference number 31 designates the center of the eccentric disk 23 this center is spaced apart from the center of rotation 30 by an eccentricity u201c e u201d counterweights 16 a and 16 b are arranged on the drive shaft 24 and ensure a balanced operation of the machine fig6 shows an alternative embodiment of the compressor expander machine with a drive motor preferably an electric motor the housing 66 of the motor has threaded brackets 8 b u2032 into which screw fittings 8 c engage together with an intermediate housing 54 on the expansion side and the housing halves 7 a and 7 b the compressor expander machine 1.