Patent ID: 7157828

Claim:
A fuel pump for supplying fuel sucked from a fuel tank to an internal combustion engine comprising: permanent magnets that are installed along a circumference of a circle on an inside surface of a housing and provide different magnetic poles alternately; an armature installed inside the permanent magnets rotatably, and including a central core installed in a center of revolution of the armature, plural coil cores, which are magnetically coupled with the central core and installed outside the central core in a direction of revolution as a separate body from the central core, bobbins covering the coil cores respectively, and coils made by winding windings on the bobbins in a concentrated winding form, respectively; a commutator, which has plural segments connected with the coils electrically and revolves with the armature; a suction force generation means that revolves with the armature and generates a suction force for sucking the fuel from the fuel tank; and a cover adjacent to and covering at least one axial end surface of the armature to define a passage for fuel to flow around the armature, the cover being imperforate and covering at least an entire axial end surface of the armature on an opposite end thereof with respect to the commutator, wherein a gap is provided between the cover and the coils of the armature, and wherein a clearance space is formed between the permanent magnets and the armature, and the fuel sucked by the suction force generation means is discharged from a fuel discharge outlet through the clearance space.