Electric motor-driven fuel pump
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorHiroshi Yoshioka
Life of this patent
Estimating the term…
Abstract
Permanent magnets (30, 31) are placed in both sides on the basis of a centerline of a rotor (16) perpendicular to a direction of a load applied to an impeller (4) by a pressure distribution within a pump flow path (7), and also an axial center (31a) of the permanent magnet (31) is placed with the axial center offset to the side of the impeller (4) from an axial center (30a) of the other permanent magnet (30) and a turning moment is generated on the rotor (16) and thereby a load applied to bearings (17, 18) is reduced.
Claims4
An electric motor-driven fuel pump comprising a disk-shaped impeller having blades in the outer circumferential edge, a pump casing assembly which rotatably supports the impeller and provides a pump flowpath with a circular arc band shape extending along the blades of the impeller and a suction port and a discharge port opened in both ends of said pump flow path, a rotor having a center shaft fitted in the center of the impeller and a core fixed in said center shaft, bearings for rotatably supporting the center shaft of the rotor, and a pair of permanent magnets concentrically provided in an outer circumference of the rotor, characterized in that the permanent magnets are placed so that a load of a direction opposite to a direction of a load applied to the impeller by a pressure distribution within the pump flow path is generated in the rotor.
Dependencies are inferred from the claim text.