Patent ID: 7396217
Filing Date: 2008-07-08
Classification: F02M,F04D

Abstract:
1. A fuel pump for supplying fuel drawn from a fuel tank into an internal combustion engine, the fuel pump comprising: a rotor; a rotation shaft, which revolves integrally with the rotor; bearing members, which support both axial ends of the rotation shaft; a stator, which is disposed on an outer circumference of the rotor and surrounds the rotor; a housing, which houses therein the rotor, the rotation shaft, the bearing members and the stator; a drawing force generative means, which is fixed to the housing at an axial end of the housing to face the rotor in an axial direction of the rotor generates drawing force for drawing fuel from the fuel tank into the housing by means of rotation force of the rotor, wherein: the rotor has a recess in a center of its axial end portion; at least one of the bearing members is disposed in the recess; the stator has a permanent magnet, which is disposed on its circumference and forms a plurality of magnetic poles the polar characters of which are alternated; the rotor includes an armature, which is rotatably disposed inside of the stator, and a commutator, which rotates integrally with the armature and has a plurality of segments respectively electrically connected with coils of the armature; and the armature has a cover, which covers one of the axial end portions of the armature and is rotatable with the coils, and said recess in the rotor includes a recess formed in said cover.