endwards of them in a different axial direction the control body 115 has control ports 13 and 23 each thrust chamber 114 115 contains a thrust member 117 or 118 radially moveable in the respective thrust chamber each thrust body has a passage 120 to communicate the outer portion which is the thrust chamber portion of the respective chamber 114 116 through the respective thrust member 117 118 to the respective fluid pressure pocket 119 in the inner end of the respective thrust member 117 or 118 the fluid pressure pockets 119 are sealed along the outer face of the control body 115 by the remaining radial inner end portions of the thrust members 117 or 118 this arrangement of fig6 can again fulfill one of two possible desired purposes either to let the rotor and control body float centrically to each other or to press them together at the half which contains the control ports under the higher pressure it is possible to extend the control body 115 and the rotor 112 with bush 111 in an axial direction in order to apply a second or more working chamber groups or cylinder groups 56 with thereto associated additional arrangements of thrust chambers and thrust members as well as the respective fluid pressure pockets and communication means the thrust members in fig5 and 6 may either be sealingly fitted in the respective thrust chambers or recesses or they may be provided with grooves or means 109 for the reception of respective seal means in the embodiment of the invention of fig7 two additional possibilities to seal against leakage between rotor 129 or rotor bush 130 and the outer face of control body 132 are shown the first possibility is to provide a radial recess no reference number.