Abstract: A fuel pump includes a pump portion for pumping fuel. The fuel pump further includes a magnet having magnetic poles circumferentially alternate with each other. The fuel pump further includes an armature on a radially inside of the magnet. The armature includes a rotor core provided with a coil formed of a wire. The armature is rotatable for driving the pump portion. A commutator, which is in a substantially disc shape, is provided to an axial end of the armature for rectifying electricity supplying to the coil. The rotor core has an axial end having an outer circumferential periphery defining a commutator-side collar portion extending toward the commutator. The coil is formed by winding the wire between an outer circumferential periphery of the commutator and the commutator-side collar portion.

Abstract: A fuel pump includes a pump portion for pumping fuel. The fuel pump further includes a magnet having magnetic poles circumferentially alternate with each other. The fuel pump further includes an armature on a radially inside of the magnet. The armature includes a rotor core provided with a coil formed of a wire. The armature is rotatable for driving the pump portion. A commutator, which is in a substantially disc shape, is provided to an axial end of the armature for rectifying electricity supplying to the coil. The rotor core has an axial end having an outer circumferential periphery defining a commutator-side collar portion extending toward the commutator. The coil is formed by winding the wire between an outer circumferential periphery of the commutator and the commutator-side collar portion.

Abstract: A fuel pump includes a pump portion for pumping fuel. The fuel pump further includes a magnet having magnetic poles circumferentially alternate with each other. The fuel pump further includes an armature on a radially inside of the magnet. The armature includes a rotor core provided with a coil formed of a wire. The armature is rotatable for driving the pump portion. A commutator, which is in a substantially disc shape, is provided to an axial end of the armature for rectifying electricity supplying to the coil. The rotor core has an axial end having an outer circumferential periphery defining a commutator-side collar portion extending toward the commutator. The coil is formed by winding the wire between an outer circumferential periphery of the commutator and the commutator-side collar portion.

Abstract: A permanent magnet has magnetic poles being circumferentially different from each other. An armature is rotatable at a radially inside of the permanent magnet and has a laminated core and a coil. The laminated core includes magnetic plates laminated in an axial direction so as to interpose an insulating layer. The magnetic plates include end magnetic plates located at most distant ends. At least one of the end magnetic plates has an outer circumferential side provided with a collar, which extends in the rotation axis direction so as to be opposed to pole faces of the permanent magnet. The at least one of the end magnetic plates has a thickness t, and the collar has a length h. The thickness t and the length h have a relationship of h/t?10.

Abstract: A fuel pump includes a plurality of magnets that are disposed circumferentially on an inner surface of a housing of the fuel pump and alternately form different magnetic poles, an armature rotatably disposed inside the permanent magnets, a rotating member disposed on a rotary shaft that is connected with the armature and rotates with the rotary shaft by rotating the armature, a pump casing that accommodates and rotatably supports the rotating member, and a discharge port disposed on the pump casing so as to discharge fuel pressurized by the rotation of the rotating member. According to the present invention, an imaginary line extending straight through the discharge port in a flow direction of fuel discharging from the discharge port extends into a circumferential gap between two of said permanent magnets.

Abstract: There are provided a positive-electrode brush and a negative-electrode brush, which contact with a commutator to conduct electricity, a positive-electrode spring, which biases the positive-electrode brush against the commutator, a negative-electrode spring, which biases the negative-electrode brush against the commutator, and a partition member defining a fuel passage hole, through which fuel passes to a brush accommodating passage from a motor accommodating passage. The positive-electrode spring is arranged offset from the positive-electrode brush and the negative-electrode spring is arranged offset from the negative-electrode brush. Further, the fuel passage hole defined in the partition member is arranged between both the springs when being viewed from the rotation axis.

Abstract: A fuel pump includes a pump portion for pumping fuel. The fuel pump further includes a magnet having magnetic poles circumferentially alternate with each other. The fuel pump further includes an armature on a radially inside of the magnet. The armature includes a rotor core provided with a coil formed of a wire. The armature is rotatable for driving the pump portion. A commutator, which is in a substantially disc shape, is provided to an axial end of the armature for rectifying electricity supplying to the coil. The rotor core has an axial end having an outer circumferential periphery defining a commutator-side collar portion extending toward the commutator. The coil is formed by winding the wire between an outer circumferential periphery of the commutator and the commutator-side collar portion.

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.

Abstract: A commutator includes six segments disposed in the direction of rotation, and is attached to one axial end of an armature. By the commutator rotating together with the armature, each of the segments successively contacts a brush. Each of the segments is electrically connected with terminals through mid-terminals. Three of the six terminals, non-adjacent and alternatingly located in the direction of rotation, are electrically connected directly with mid-terminals facing in radial opposition. Capacitors are electrically connected directly with the terminals adjacent in the direction of rotation. Discharge does not occur between the brush and segments when the brush separates from the segments accompanying rotation of the armature, since electromagnetic energy built up in the coils of the armature is temporarily built up in the capacitors.

Abstract: A fuel pump mounted in the fuel tank for the motor cycle comprises a motor and a pump driven by the motor for increasing a pressure of the sucked fuel. The motor is a brushless motor and has a stator core, coils and a rotor. An electrical energization for the coils wound around the stator core is controlled in response to a rotating position of the rotor, thereby the rotor is rotated. The rotor has a shaft, a rotating core and a permanent magnet, and the rotor is rotatably mounted at the inner circumference of the stator core. The permanent magnet is mounted at the outer circumference of the rotating core and magnetically energized so as to form magnetic poles different alternatively in a rotating direction at the outer circumferential surface facing the stator core.

Abstract: A commutator includes six segments disposed in the direction of rotation, and is attached to one axial end of an armature. By the commutator rotating together with the armature, each of the segments successively contacts a brush. Each of the segments is electrically connected with terminals through mid-terminals. Three of the six terminals, non-adjacent and alternatingly located in the direction of rotation, are electrically connected directly with mid-terminals facing in radial opposition. Capacitors are electrically connected directly with the terminals adjacent in the direction of rotation. Discharge does not occur between the brush and segments when the brush separates from the segments accompanying rotation of the armature, since electromagnetic energy built up in the coils of the armature is temporarily built up in the capacitors.

Abstract: A DC motor includes an armature winding that includes a first coil group of a plurality of phase coils and a second coil group of a plurality of phase coils, a commutator, a brush unit that includes two pairs of brushes and a motor current supply device. The first and second coil groups are connected in series to a DC power source via the commutator and the two pairs of brushes to be supplied with motor current by the motor current control device. Therefore, voltage applied across the brushes and the commutator is reduced, and arc discharge is suppressed.

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.

Abstract: A commutator having even number (2n) of commutator segments and n segment pairs, each pair consisting of two commutator segments positioned symmetrically with respect to a commutator center, is mounted on a rotor of an electric rotary machine. The commutator segments are electrically insulated from one another, while the commutator segments in each pair are electrically connected to each other. A metallic base plate and a carbon segment plate are molded together with resin, and then the commutator segments are separated into individual segments. Connecting portions for electrically connecting the commutator segments in each pair are formed integrally with the metallic base plate at positions depressed from a surface of the metallic base plate, so that the connecting portions are not cut in the process of separating the segment plate into individual commutator segments.

Abstract: In a DC motor, a plurality of bobbins is respectively mounted on teeth of an armature core. The armature core is comprised of an internal core unit and an external core unit that is coaxially disposed outside the internal core unit. A plurality of armature coils is respectively wound around the bobbins. A case has a plurality of first terminal members that are respectively connected to commutator segments. Each of the armature coils is connected to each other via the first terminal members. Each of the bobbins includes a second terminal member that is coupled to one of the first terminal members.

Abstract: When a pump operates, a check valve body leaves a check valve seat due to a pump side fuel pressure for opening a fluid passage inside a pressure adjusting valve body. When the pump does not operate, the check valve body contacts the check valve seat due to an engine side fuel pressure for closing the fluid passage. Thus, the engine side fuel is prevented from flowing-back to the pump. When the pump stops operating and the engine side fuel pressure exceeds a pressure corresponding to an urging force of a coil spring, the pressure adjusting valve body leaves the pressure adjusting valve seat with the check valve body, so that a gap is provided between the pressure adjusting valve body and the pressure adjusting valve seat for releasing the engine side fuel having excess pressure.

Abstract: In a DC motor, a plurality of bobbins is respectively mounted on teeth of an armature core. The armature core is comprised of an internal core unit and an external core unit that is coaxially disposed outside the internal core unit. A plurality of armature coils is respectively wound around the bobbins. A case has a plurality of first terminal members that are respectively connected to commutator segments. Each of the armature coils is connected to each other via the first terminal members. Each of the bobbins includes a second terminal member that is coupled to one of the first terminal members.

Abstract: A DC motor is comprised of an armature winding that includes a first coil group of a plurality of phase coils and a second coil group of a plurality of phase coils, a commutator, a brush unit that includes two pairs of brushes and a motor current supply device. The first and second coil groups are connected in series to a DC power source via the commutator and the two pairs of brushes to be supplied with motor current by the motor current control device. Therefore, voltage applied across the brushes and the commutator is reduced, and arc discharge is suppressed.

Abstract: A commutator having even number (2n) of commutator segments and n segment pairs, each pair consisting of two commutator segments positioned symmetrically with respect to a commutator center, is mounted on a rotor of an electric rotary machine. The commutator segments are electrically insulated from one another, while the commutator segments in each pair are electrically connected to each other. A metallic base plate and a carbon segment plate are molded together with resin, and then the commutator segments are separated into individual segments. Connecting portions for electrically connecting the commutator segments in each pair are formed integrally with the metallic base plate at positions depressed from a surface of the metallic base plate, so that the connecting portions are not cut in the process of separating the segment plate into individual commutator segments.

Abstract: A brushless motor composed of a cylindrical stator and a magnet rotor rotatably supported in the stator is driven by a battery. The stator includes a multi-phase armature winding to which current is supplied from the battery through a drive-control circuit. The drive-control circuit includes switching elements that are selectively turned on and off to generate a rotating magnetic field in the stator. The switch-timing of the switching elements is controlled according to a rotational position of the rotor and the battery voltage. When the battery voltage is normal, the switch-timing is set to an optimum point so that a maximum efficiency of the brushless motor is obtained. When the battery voltage becomes low, the switch-timing is advanced to secure a required motor speed. Thus, the required motor speed is always secured without using additional devices such as a voltage stabilizer or a pulse-width modulation controller.