Regulatable coolant pump

A regulatable coolant pump having:

• a pump interior,
• a pump housing having an impeller side and a design,
• a pump shaft mounted in, on, or in and on the pump housing in a pump bearing, driven by a pulley having a free, flow-side end, and having an axis of rotation,
• an impeller disposed on the free, flow-side end of the pump shaft, so as to rotate with the pump shaft and having a pump housing side and an outflow region,
• a pressure-activated valve slide spring-loaded via a return spring, having a back wall, having an outer cylinder variably covering the outflow region of the impeller, and disposed in the pump interior
• a sealing accommodation in the pump housing,
• a shaft sealing ring disposed in the sealing accommodation and between the impeller and the pump bearing,
• a working housing disposed on the pump housing and having a pump shaft side,
• a solenoid having an inlet opening and disposed in the working housing,
• a sleeve accommodation disposed to lie opposite the sealing accommodation in the pump housing on the impeller side of the pump housing,
• a ring channel worked into the sleeve accommodation with rotation symmetry relative to the axis of rotation of the pump shaft,
• a pressure channel connected to the ring channel,
• a pressure chamber adjacent to the inlet opening of the solenoid disposed in the working housing on the pump shaft side of the working housing, and emptying into the pressure channel such that the pressure chamber is connected via the pressure channel with the ring channel,
• a ring piston working sleeve having a sealing crosspiece, a bottom, an outer cylinder, an inner cylinder projecting beyond the outer cylinder, and an impeller-side end and disposed in the sleeve accommodation, the pump shaft rotating freely within the ring piston working sleeve, the outer cylinder having sleeve flow-through openings to the ring channel, the sleeve flow-through openings having a diameter and being disposed close to the bottom of the ring piston working sleeve,
• a position-securing sleeve attached, with shape fit and/or force fit, on the inner cylinder of the ring piston working sleeve,
• a wall disk disposed rigidly on the position-securing sleeve and having an outer edge,
• a ring piston having an impeller-side face wall and a crosspiece contact, the back wall of the pressure-activated valve slide being disposed with shape fit and/or force fit on the impeller-side face wall of the ring piston,
• a profile seal having an impeller side, disposed spaced apart from the bottom of the ring piston working sleeve approximately by the diameter of the sleeve flow-through openings, displaceable in the ring piston working sleeve, and connected, on the impeller side, with the ring piston,
• a bypass seal disposed on the outer edge of the wall disk,
• a slanted disk rigidly disposed on the impeller on the pump housing side of the impeller and having a sinking region, a suction groove worked into the sinking region, a rising region, and a transition region from the sinking region into the rising region, the transition region as well as all of the rising region being planar,
• a push-through bore in the wall disk, centered relative to the suction groove of the slanted disk, and having a bore axis,
• an insertion bore opening into the pressure channel, disposed in the pump housing, and aligned with the bore axis of the push-through bore,
• at least one first pass-through opening, the at least one first pass-through opening being disposed in the back wall of the pressure-activated valve slide and corresponding to the design of the pump housing,
• a cylinder sleeve disposed in the insertion bore with shape fit and/or force fit and having a cylinder sleeve bottom and an outside,
• an axial piston pump integrated into the cylinder sleeve,
• at least one outflow opening disposed in a region of the cylinder sleeve bottom of the cylinder sleeve,
• a valve basket with a valve disk and a valve spring pressing the valve disk against the cylinder sleeve bottom in a region of the at least one outflow opening, the valve basket being disposed in the region of the cylinder sleeve bottom and on the outside of the cylinder sleeve,
• at least one second pass-through opening, the at least one second pass-through opening being situated in the valve basket,
• a working spring disposed in the cylinder sleeve as an additional module of the axial piston pump and having an impeller side,
• a working piston having a flow-through bore and making contact with the working spring on the impeller side of the working spring,
• a slide shoe having a pass-through bore and disposed between the working piston and the slanted disk, the pass-through bore being worked into a related region of the suction groove and being adjacent to the flow-through bore of the working piston,
• an outflow groove disposed in the working housing,
• at least one backflow bore in the working housing and leading into the pump housing,
• an outlet opening:
• disposed on the solenoid,
• disposed in the working housing directly adjacent to the at least one backflow bore or disposed indirectly, by way of the outflow groove, adjacent to the at least one backflow bore,
• wherein the at least one backflow bore connects the outlet opening with the pump interior, and
• wherein the return spring of the pressure-activated valve slide is disposed:
• between the wall disk and the ring piston, or
• between the wall disk and the back wall of the pressure-activated valve slide.