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A coolant pump for delivering a coolant in a coolant circuit of a combustion engine, including: a housing; a drive shaft, rotatably mounted by the housing and rotationally driven by the combustion engine; a radial feed wheel, rotationally driven by the drive shaft, for delivering coolant from a radi

A coolant pump for delivering a coolant in a coolant circuit of a combustion engine, including: a housing; a drive shaft, rotatably mounted by the housing and rotationally driven by the combustion engine; a radial feed wheel, rotationally driven by the drive shaft, for delivering coolant from a radially internal inflow region into a radially more external outflow region; a setting structure, adjustable into different positions relative to the housing by control fluid, for adjusting a flow geometry which influences the delivery volume of the pump at a given rotational speed; a control valve for setting a pressure or volume flow of the control fluid which determines the position of the setting structure; and a servo pump, which is a rotary pump including at least one servo pump wheel and can be rotationally driven by the drive shaft, for delivering the control fluid to the control valve.

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1. A coolant pump for delivering a coolant in a coolant circuit of a combustion engine, said coolant pump comprising: a) a housing;b) a drive shaft, which is rotatably mounted by the housing, for being rotationally driven by the combustion engine;c) a radial feed wheel which can be rotationally driv

1. A coolant pump for delivering a coolant in a coolant circuit of a combustion engine, said coolant pump comprising: a) a housing;b) a drive shaft, which is rotatably mounted by the housing, for being rotationally driven by the combustion engine;c) a radial feed wheel which can be rotationally driven by the drive shaft, for delivering the coolant from a radially internal inflow region into a radially more external outflow region;d) a setting structure which can be adjusted into different positions relative to the housing by means of a control fluid, for adjusting a flow geometry, wherein a flow cross-section or flow profile on the flow path of the coolant comprises the inflow region, the radial feed wheel and the outflow region, and wherein said flow geometry influences the delivery volume of the pump at a given rotational speed;e) a control valve for setting a pressure or a volume flow of the control fluid formed by the coolant, wherein said pressure or said volume flow determines the position of the setting structure; and in addition to the radial feed wheel, a servo pump for delivering the control fluid to the control valve, whereing) the servo pump is a rotary pump which can be rotationally driven by the drive shaft and comprises at least one servo pump wheel which can be rotationally driven. 2. The coolant pump according to claim 1, wherein the servo pump wheel is arranged coaxially with the drive shaft and is non-rotationally connected to the drive shaft. 3. The coolant pump according to claim 1, wherein the servo pump is (i) a single-stage or multi-stage side channel pump or(ii) a centrifugal pump or(iii) a toothed wheel pump or(iv) an internal toothed wheel pump or(v) a vane cell pump' or(vi) a pendulum slider pump or(vii) a roller cell pump. 4. The coolant pump according to claim 1, wherein the servo pump is connected to the coolant circuit, and an inlet of the servo pump is connected to the coolant circuit within the housing of the coolant pump. 5. The coolant pump according to claim 1, wherein the setting structure is coupled to a piston or itself forms a piston to which the control fluid can be applied to in order to adjust the setting structure, and a pressure holding means for maintaining the pressure of the control fluid between the servo pump and the control valve, which pressure is applied to the piston, or a pressure limiter for limiting the pressure of the control fluid which is applied to the piston is/are provided. 6. The coolant pump according to claim 1, wherein the servo pump wheel is arranged in a servo pump housing. 7. The coolant pump according to claim 6, wherein a pressure holding means for maintaining the pressure of the control fluid is provided between the servo pump and the control valve, which pressure is applied to the piston, or a pressure limiter for limiting the pressure of the control fluid which is applied to the piston is provided, and the pressure holding means or the pressure limiter is/are arranged in the servo pump housing. 8. The coolant pump according to claim 6, wherein a lid of the housing of the coolant pump also forms .a lid of the servo pump housing. 9. The coolant pump according to claim 1, wherein the setting structure is an annular slider or guide slider which can be axially adjusted into the different positions relative to the radial feed wheel, wherein (i) the setting structure, when embodied as an annular slider, axially overlaps the radial feed wheel at least partially on an outer circumference in at least one of the positions such that a flow transition cross-section which leads from the radial feed wheel into the outflow region can be varied,(ii) and the setting structure, when embodied as a guide slider, is non-rotationally connected to the radial feed wheel and arranged axially between the radial feed wheel and a covering structure which is fixedly connected to the housing of the coolant pump, such that axially adjusting the guide slider changes the axial width of a flow cross-section which is limited by the covering structure and the guide slider. 10. The coolant pump according to claim 1, wherein the setting structure is axially guided in a guide contact along a guide, and the guide contact exhibits a radial distance from a rotational axis of the drive shaft. 11. The coolant pump according to claim 1, wherein the setting structure is axially guided along a guide in a guide contact near to the outer circumference of the setting structure, and a guide sleeve which is inserted into the housing of the coolant pump forms the guide. 12. The coolant pump according to claim 1, wherein the setting structure is axially guided in a guide contact along a guide, and the setting structure alternately comprises axially extending stays and recesses in the circumferential direction on a circumferential surface which radially faces the guide, and the stays of the setting structure are in a sliding contact with the guide. 13. The coolant pump according to claim 10, wherein the setting structure is coupled to a piston or itself forms a piston to which the control fluid can be applied to in order to adjust the setting structure and further comprising at least one of the following features: (i) the housing of the coolant pump is produced from aluminum or an aluminum-based alloy;(ii) the setting structure is produced from plastic;(iii) the guide is produced from steel and is preferably a steel sleeve;(iv) the piston is an elastomer piston or a rubber piston. 14. The coolant pump according to claim 1, wherein the servo pump is connected to the coolant circuit and a port is provided within the centrifugal force field of the radial feed wheel and connected to an inlet of the servo pump. 15. The coolant pump according to claim 1, wherein the servo pump is connected to the coolant circuit, and a filter is provided upstream of the servo pump wheel in order to keep particles carried by the coolant away from the servo pump wheel. 16. The coolant pump according to claim 1 further comprising at least one of the following features: (i) a filter is connected to the drive shaft in a way which transmits torque, such that when the drive shaft is rotationally moved, particles situated on or in the filter are removed from the filter by centrifugal force;(ii) a cleaning means is assigned to the filter, and one of the cleaning means and the filter is connected to the drive shaft in a way which transmits torque, and can be rotated relative to the other of the cleaning means and the filter, wherein the cleaning means sweeps over the filter during the relative rotational movement, in order to mechanically or fluidically clean it;(iii) a cleaning means is assigned to the filter, and control fluid which is delivered by the servo pump can be applied to the rear side of the filter by means of the cleaning means, in order to rinse the filter. 17. The coolant pump according to claim 1, wherein the setting structure can be adjusted along an adjusting axis and is mounted by means of at least two elastically deformable holding arms which are arranged in a distribution around the adjusting axis of the setting structure, and the holding arms are formed and arranged in relation to the adjusting axis such that they keep the setting structure centered in relation to the adjusting axis when the setting structure is adjusted. 18. The coolant pump according to claim 1, wherein the control valve is coupled to a controller and the controller is coupled to a temperature sensor, a rotational speed sensor, a load sensor, a throughflow sensor, a position sensor or a range sensor which detects the temperature or the mass throughflow or volume throughflow of the coolant or a rotational speed or load of the combustion engine or the position of the setting structure or a distance travelled by the setting structure when adjusted as compared to a reference position of the setting structure and feeds a corresponding sensor signal to the controller, and the controller controls the control valve in accordance with the sensor signal. 19. The coolant pump according to claim 1, wherein the radial feed wheel is connected non-rotationally to the drive shaft. 20. The coolant pump according to claim 4, wherein the inlet of the servo pump is connected to the coolant circuit within the centrifugal force field of the radial feed wheel or downstream of the radial feed wheel. 21. The coolant pump according to claim 5, wherein the piston is an annular piston. 22. The coolant pump according to claim 6, wherein the servo pump housing is arranged in the housing of the coolant pump. 23. The coolant pump according to claim 9, wherein the setting structure is embodied as an annular slider and surrounds the radial feed wheel, forming an annular gap around the entire outer circumference of the radial feed wheel. 24. The coolant pump according to claim 10, wherein the radial distance is greater than half the radius of the outer circumference of the radial feed wheel or the radius of the outer circumference of the servo pump wheel. 25. The coolant pump according to claim 10, wherein the servo pump wheel is arranged in a servo pump housing and the guide surrounds the servo pump housing . 26. The coolant pump according to claim 13, wherein the setting structure is produced from a thermoplast and is a plastic injection-moulded structure. 27. The coolant pump according to claim 14, wherein the port is provided in or upstream of the radial feed wheel. 28. The coolant pump according to claim 14, wherein the port is connected to the inlet of the servo pump through the radial feed wheel or the drive shaft. 29. The coolant pump according to claim 15, wherein the filter is provided in or on the housing of the coolant pump. 30. The coolant pump according to claim 7, wherein a lid of the housing of the coolant pump also forms a lid of the servo pump housing.