Gear ring pump with a pump housing, with a working space in the pump housing with intake and / or outlet areas located in the front wall of the working space in the pump housing a sealed housing cover located at the pump housing by using a seal, with a rotatable drive shaft mounted on a pump bearing in the pump housing where an impeller mechanism is located, consisting of an interior rotor with external gear teeth connected rotatably with the drive shaft and an exterior rotor with internal gear teeth, which is mounted rotatably in a rotor bearing in the cylindrical working space of the pump housing in such a way that the teeth of the interior rotator located off-centre to the exterior rotor mesh in certain areas with the teeth of the exterior rotor, with suction manifold(s) located on one or both sides in the suction area of the impeller mechanism and with pressure manifold(s) located on one or both sides in the pressure area of the impeller mechanism, whereby the suction manifold(s) is / are connected via one suction duct / suction ducts located in the pump housing with at least one suction connection located at the pump housing and that the pressure manifold(s) is / are connected via one pressure duct / pressure ducts located in the pump housing with at least one pressure connection located at the pump housing and that the liquid to be pumped from the suction connection through the impeller mechanism located in the pump housing is forced into the pressure connection, characterized by the fact, - that the pump bearing is located in the housing cover and - that a mounted portal support is located in the pump housing between the impeller mechanism and the front wall of the working space so that it is twist-free and can be slid in the direction of the drive shaft where both a suction manifold and also a pressure manifold are located and where both penetrate the portal support completely separate from each other over the entire thickness of the portal support in the form of an inflow chamber connected with the suction manifold(s) and an outflow chamber connected with the pressure manifold, whereby the thickness of the portal support either corresponds to the thickness of the impeller mechanism, or extends beyond the thickness of the impeller mechanism by up to 20%, whereby the coefficient of thermal expansion of the portal support is 70% to 120% more than the coefficient of thermal expansion of the pump housing and - that the drive shaft connected twist-free with the interior rotor does not project in any way at all into the portal support and - that the portal support, designed to be wear resistant or coated on the front side adjacent to the impeller mechanism and / or that a twist-free sliding plate, connected with portal support is located between the impeller mechanism and the portal support. - that the pump bearing is located in the housing cover and - that a mounted portal support is located in the pump housing between the impeller mechanism and the front wall of the working space so that it is twist-free and can be slid in the direction of the drive shaft where both a suction manifold and also a pressure manifold are located and where both penetrate the portal support completely separate from each other over the entire thickness of the portal support in the form of an inflow chamber connected with the suction manifold(s) and an outflow chamber connected with the pressure manifold, whereby the thickness of the portal support either corresponds to the thickness of the impeller mechanism, or extends beyond the thickness of the impeller mechanism by up to 20%, whereby the coefficient of thermal expansion of the portal support is 70% to 120% more than the coefficient of thermal expansion of the pump housing and - that the drive shaft connected twist-free with the interior rotor does not project in any way at all into the portal support and - that the portal support, designed to be wear resistant or coated on the front side adjacent to the impeller mechanism and / or that a twist-free sliding plate, connected with portal support is located between the impeller mechanism and the portal support.