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Fuel pump, fuel supply equipment using fuel pump and method for manufacturing fuel pump

A fuel supply and fuel pump technology, applied in liquid fuel feeders, mechanical equipment, manufacturing of motor generators, etc., can solve the problems of increased sliding resistance, increased sliding friction, and no introduction, etc., to reduce sliding resistance and fuel emissions. The effect of reducing the number and reducing the drive current

Active Publication Date: 2005-10-05
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to seal between the bearing in sliding contact with the rotating shaft and the pump chamber, and Patent Document 2 does not introduce a structure for sealing between the pump chamber and the bearing
[0022] In addition, even if the pump chamber and the bearing can be sealed from each other, since the sliding part between the rotating shaft and the bearing is not lubricated by fuel, there are still problems of increased sliding resistance and increased sliding friction

Method used

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  • Fuel pump, fuel supply equipment using fuel pump and method for manufacturing fuel pump
  • Fuel pump, fuel supply equipment using fuel pump and method for manufacturing fuel pump
  • Fuel pump, fuel supply equipment using fuel pump and method for manufacturing fuel pump

Examples

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no. 2 example

[0109] Figure 7 shows a second preferred embodiment. This preferred embodiment is basically the same in structure as the first preferred embodiment, except that the pump 1060 is different from the pump 1013 in the first preferred embodiment. Components that are substantially the same as those of the first preferred embodiment are designated with the same reference numerals.

[0110] In the second preferred embodiment, the pump 1060 constitutes a trochoidal pump, the outer rotor 1064 is provided in the inner peripheral side of the casing 1062 , and the inner rotor 1066 is provided in the inner periphery of the outer rotor 1064 . Internal teeth 1065 formed on the inner periphery of the outer rotor 1064 mesh with outer teeth 1067 formed on the outer periphery of the inner rotor 1066 . The center of the outer rotor 1064 is eccentric with respect to the center of the inner rotor 1066 . The number of internal teeth 1065 is one more than the number of external teeth 1067 . When th...

no. 3 example

[0112] Figure 8 A third preferred embodiment of the present invention is shown. Basically the same constituent elements as those of the first preferred embodiment are denoted by the same reference numerals.

[0113] In the third preferred embodiment, the control device 1220 includes a three-phase circuit 1230 , a current detector 1240 and a PWM (Pulse Width Modulation) control element 1250 . The three-phase circuit 1230 in the third preferred embodiment is basically the same as Figure 5 The control device 1210 shown is the same. The three-phase circuit 1230, the current detector 1240, and the PWM control element 1250 are constituted as one terminal IC element as one circuit assembly.

[0114] The current detector 1240 compares the sum of the currents flowing through the six coils 1024 of the fuel pump 1010 with a preset value, and sends the comparison result to the PWM control element 1250 .

[0115] On the PWM control element 1250 serving as a limiting circuit, a corres...

no. 7 example

[0188] Figure 19 and 20 show a seventh preferred embodiment of the present invention. The same elements as those in the fifth preferred embodiment are represented by the same symbols.

[0189] Figure 19 The illustrated stator core 2090 includes an outer peripheral core 2092 and six coil cores 2094 protruding from the outer peripheral core 2092 toward the rotor 2050 separated from the outer peripheral core 2092 . The outer peripheral core 2092 and the coil core 2094 are formed as a stack of magnetic steel sheets having an insulating film covered thereon. Coil 2042 and coil core 2094 are insulated by insulating resin 2048 .

[0190] Figure 20A and 20B One method of manufacturing stator core 2090 and coils 2042 is shown.

[0191] 6 coil cores 2094 are fixed on tools such as fixtures and installed on Figure 20A at the position shown. In this state, the coil 2042 and the insulating resin 2048 are not formed. The six coil cores 2094 are poured and fixed by the insulating...

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Abstract

The fuel pump 1010 is installed in a fuel tank for a motorcycle. The fuel pump 1010 comprises a motor 1012 and a pump 1013 driven by the motor 1012 for pressurizing sucked fuel. The motor 1012 is a brushless motor, and has a stator 1020, coils 1024 and a rotor 1030. Current-passage to the coils 1024 wound around the stator core 1020 is controlled on the basis of a rotational position of the rotor, and thereby the rotor 1030 is rotated. The rotor 1030 has a shaft 1032, a rotary core 1034, and a permanent magnet 1036. The rotor 1030 is rotatably mounted on the inner circumstance of the stator core 1020. The permanent magnet 1036 is mounted on the outer circumference of the rotary core 1034, and magnetized so as to form magnetic poles different alternately in the rotation direction on the side of the outer circumferential surface facing to the stator core 1020.

Description

technical field [0001] The present invention relates to an in-tank type fuel pump for motorcycles, a fuel supply device using the fuel pump, and a method of manufacturing the fuel pump. Background technique [0002] Generally, such a motorcycle is known in the art that a rectifier controls the current supplied to a rotor having a coil wound around it so that the rotor rotates. As a power source of a fuel pump that absorbs fuel in a fuel tank and supplies the fuel to an engine as a fuel consuming device, an electric motor controlled by the rectifier described above has been used (for example, refer to Patent Document 1). However, motors controlled by commutators have some disadvantages in that the efficiency of the motor decreases due to the sliding resistance between the commutator and the brushes, and the fluid resistance generated in the slots formed to divide the commutator into each commutator segment , so that the efficiency of the fuel pump decreases. The efficiency ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M37/00F02M37/10F04B17/00F04B35/04F04D5/00H02K1/14H02K15/095H02K29/00
CPCH02K15/095F02M37/048F04D5/002H02K1/148F02M37/10
Inventor 长田喜芳诸户清规黑岩一成大竹晶也
Owner DENSO CORP
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