Abstract: An internally or externally geared pump for conveying fluids lacking or only having insufficient lubricating ability, includes gearwheels moving in an operating chamber of the pump, conveying fluids and being mounted completely in parts formed of a carbon material. Supports are formed from accurately worked lateral walls and a jacket of the operating chamber formed of the carbon material. The jacket surrounds the gearwheels in the radial direction and is likewise constructed as a support. Chambers on the suction side and on the pressure side for fluid supply and fluid removal, which are necessary for the operation of the pump, are molded into side walls of the operating chamber which is formed of carbon.

Abstract: A controllable motor vehicle coolant pump driven by an internal combustion engine via a belt pulley connected to a driving shaft. The pump does not require a shaft seal for sealing the flow chamber against the bearing casing of the driving belt pulley, and reduces fuel consumption and exhaust gas emission during the entire operating range of the engine. The pump comprises two opposing clutch halves mounted on two clutch shafts. The impeller of the coolant pump is driven by a permanently magnetic clutch. One clutch half is comprised of a multipole magnetic disc magnetized in sectors on one of the two clutch shafts. The other clutch half comprises a disk made of hysteresis material or a disk with a copper disc arranged therein mounted on the other clutch shaft. The width of the air gap between the two clutch halves is variable depending on the given operational condition of the engine.