PUMP GROUP

The invention is a pump group for a cooling system of an operating group of a vehicle, preferably the engine group. The pump group (1) extends with respect to an axis (X-X) and comprises an impeller (2), a shaft (3) on which the impeller (2) is integrally mounted, and an electric motor (4) comprising a rotor (41) integrally mounted on the shaft (3) and a stator (41) that surrounds the rotor (41) axially and circumferentially. The pump group (1) comprises a pump body (5) comprising, along the axis (X-X): an impeller casing (6) in which the impeller (2) is housed; a separating and supporting element (7) comprising a collar (70) that engages and rotatably supports the shaft (3); a motor casing (8) in which the electric motor (4) is housed. Said impeller chamber (60) and said motor chamber (80) are sealingly separated from each other and the motor chamber (80) contains a quantity of oil suitable for cooling the rotor (41) and the stator (42) by convection, in which the rotation of the rotor (41) propells the oil.