Leakage loss flow control and associated media flow delivery assembly

A rotary piston machine, comprising:

• a shaft rotor;
• a counter rotor, the shaft rotor and the counter rotor having respective axes of rotation which are arranged at a particular axial angle to one another;
• mutually meshing gears on mutually facing front sides of the shaft rotor and the counter rotor facing one another and limiting working chambers there between;
• a machine housing in which the shaft rotor and the counter rotor are supported radially and axially, a suction connection and a pressure connection in fluid communication with the working chambers at respective positions of a rotational cycle of the shaft rotor and the counter rotor, said respective positions being selected to provide suction and pressure at the suction connection and the pressure connection, respectively, when the shaft rotor and the counter rotor are rotated;
• at least one rotor of the shaft and counter rotor in the machine housing being mounted in an axially displaceable manner in a direction of the axis of rotation of the counter rotor,
• said at least one of the shaft and counter rotor which is axially displaceable being rotationally arranged in a plain bearing bush provided in the machine housing;
• structure defining a control space provided in said housing said control space being formed on a section of said at least one of the shaft and counter rotor that is averted from the working chambers and that extends into the plain bearing bush;
• a fluid communication path between the control space and the working chambers configured to transfer fluid from the working chambers to the control
• wherein said at least one rotor has a working pressure force acting at said front sides by working pressure of fluid in the working chambers and has an adjusting force acting by the transfer fluid on an extended section that extends into the plain bearing bush;
• and
• wherein the fluid communication path is configured for the adjusting force to counteract the working pressure force and adjust relative axial position between said shaft rotor and counter rotor;
• and
• a control valve having a control plunger spanning across a first, second and third control chambers, the first control chamber being coupled to a pressure connection, the second control chamber being coupled to the suction connection, the third control chamber being coupled to a backside of at said at one of the shaft and counter rotor;
• wherein said fluid communication path comprises a control channel within the control valve, wherein the control channel is within the control plunger extending along a length of the control plunger to an opening to the third control chamber towards one end of the control channel, the control plunger having a control inlet towards another end of the control channel;
• wherein the control inlet provides fluid communication from at most one of either the first control chamber or the second control chamber into the control channel at a given time according to an axial position of the plunger;
• and wherein the control inlet is configured at the plunger to have an area exposed for fluid flow that is variable as a function of the position of the control plunger, so that during a first axial range of motion of the control plunger for which the control inlet is exposed to the first control chamber varies to control amount of flow between the first control chamber and the control channel, and so that during a second, different axial range of motion of the control plunger for which the control inlet is exposed to the second control chamber the area exposed to the second control chamber varies to control amount of flow between the second control chamber and the control channel.