Fuel pump for high torque in compact structure
First Claim
1. 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, andwherein 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.
1 Assignment
0 Petitions
Accused Products
Abstract
In a fuel pump, four permanent magnets are installed in a housing. An armature is installed inside the permanent magnets rotatably. Six magnetic pole coil portions of the armature are installed in a central core. Each magnetic pole coil portion has a coil core, a bobbin and a coil formed by winding a winding on the bobbin in a concentrated winding form. Each coil core has an outer region in opposition to the permanent magnet in a direction of revolution, and a board-shaped coil-winding portion extending from the outer region toward the central core. Each bobbin covers the coil core except for the outer surface of the outer region and a convex portion.
37 Citations
26 Claims
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1. A fuel pump for supplying fuel sucked from a fuel tank to an internal combustion engine comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A fuel pump for supplying fuel sucked from a fuel tank to an internal combustion engine comprising:
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permanent magnets that are installed along a circumference of a circle and provide different magnetic poles alternately; an armature installed inside the permanent magnets rotatably, and including a central core installed in the center of the revolution of the armature, plural coil cores, which are magnetically coupled with the central core, and installed outside the central core in the direction of revolution as a separate body from the central core, bobbins that cover the coil cores, and coils that are made by winding windings on the bobbins 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 suction force of 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 the number of the magnetic poles is equal to four or more than four and an even number, and magnetic pole coil portions, which include the coil cores, the bobbins and the coils respectively, are more than the magnetic poles formed by the permanent magnets. - View Dependent Claims (23, 24)
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25. A fuel pump for supplying fuel sucked from a fuel tank to an internal combustion engine comprising:
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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, 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, and wherein the cover comprises a neutral point terminal located on the axial end surface of the armature opposite from the commutator, the neutral point terminal providing a neutral point of a star connection of the coils and being fit with a terminal of the coil.
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26. A fuel pump for supplying fuel sucked from a fuel tank to an internal combustion engine comprising:
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permanent magnets that are installed along a circumference of a circle and provide different magnetic poles alternately; an armature installed inside the permanent magnets rotatably, and including a central core installed in the center of the revolution of the armature, plural coil cores, which are magnetically coupled with the central core, and installed outside the central core in the direction of revolution as a separate body from the central core, bobbins that cover the coil cores, and coils that are made by winding windings on the bobbins 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 suction force of 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, wherein the number of the magnetic poles is equal to four or more than four and an even number, and magnetic pole coil portions, which include the coil cores, the bobbins and the coils respectively, are more than the magnetic poles formed by the permanent magnets, and wherein the cover is provided by a neutral point terminal located on the axial end surface of the armature opposite from the commutator, the neutral point terminal providing a neutral point of a star connection of the coils and being fit with a terminal of the coil.
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Specification