ELECTRIC MOTOR-VEHICLE COOLANT PUMP

The invention relates to an electrically driven motor-vehicle coolant pump (10) for a motor vehicle which is driven by way of an internal combustion engine, which motor-vehicle coolant pump (10) consists of a pump housing (12) and a rotor (14) which is mounted rotatably in the pump housing (12). The rotor (14) is formed by a pump rotor (16, 16') and a substantially cup-shaped motor rotor (18, 18'), wherein the pump rotor (16, 16') has a plurality of rotor blades (20) which stand directly on a cup bottom (36) of the motor rotor (18, 18'). The pump rotor (16, 16') and the motor rotor (18, 18') of the coolant pump (10) are in each case single-piece plastic components which are produced separately from one another by injection moulding and consist of different materials. This means that the pump rotor (16, 16') consists, for example, of a mechanically stable plastic or plastic mixture, and the motor rotor (18, 18') consists of another plastic or plastic/metal mixture which is adapted to the technical requirements. The motor rotor (18, 18') has a homogeneously distributed ferromagnetic substance and is magnetized with at least two poles, and in this way forms a permanently excited electric-motor rotor. The pump rotor (16, 16') has an annular bezel (22) on the distal ends of the rotor blades (20) and has no ferromagnetic substance, and is therefore not ferromagnetic. La invención se refiere a una bomba de refrigerante para automóvil accionada eléctricamente (10) para un automóvil accionado con un motor de combustión interna, que está constituida por una carcasa de bomba (12) y un rotor (14) colocado de manera giratoria en la carcasa de bomba (12) . El rotor (14) se forma por un rotor de bomba (16; 16') y un rotor de motor (18; 18') esencialmente en forma de copa, en la que el rotor de bomba (16; 16') presenta varias alas giratorias (20) que se encuentran directamente en una base de copa (36) del rotor de motor (18; 18'). El rotor de bomba (16; 16') y el rotor de motor (18; 18') son componentes de plástico que forman una pieza respectivamente fabricados mediante moldeo por inyección de manera separada uno del otro, que están compuestos por distintos materiales. Esto significa que el rotor de bomba (16; 16') está compuesto, por ejemplo, por un plástico o mezcla de plásticos mecánicamente estables y el rotor de motor (18; 18') está compuesto por otro plástico o mezcla de plástico y metal y adaptados a los requerimientos técnicos. El rotor de motor (18; 18') present