JP2002242787A - Fuel pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel pump having a structure where the number of parts is reduced. SOLUTION: The fuel pump comprises an electric motor part 19 having a magnet holder 31 to hold a magnet 25; a brush base 32 having a brush 32a to feed power to the electric motor part 19; a pump part 2 disposed on one end side of the electric motor part 19 and sucking fuel by the rotational drive force of the electric motor part 19; and a discharge cover 9 to discharge the fuel, sucked by a pump part 2 disposed on the other side of the electric motor part 19, to an external part. The brush base 32 is fitted in the circular part 31a of the magnet holder 31 of the electric motor 19 for an integral constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel pump disposed in a fuel tank of an internal combustion engine for discharging fuel to a fuel injection device.

[0002]

2. Description of the Related Art Conventional fuel pumps are disclosed, for example, in Japanese Patent No. 2504042 and Japanese Patent Laid-Open No. 11-44270.
The one disclosed in Japanese Patent Application Publication No. H10-163, etc. is known.

FIG. 2 is a longitudinal sectional view showing the internal structure of a conventional fuel pump disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 11-44270, and FIG. 3 is a sectional view taken along line AA of FIG. FIG. 4 is a top view of the conventional fuel pump shown in FIG. 2 and FIG. In these figures, reference numeral 1 denotes a cylindrical casing having both ends opened in the axial direction, reference numeral 2 denotes a pump portion provided on one end side of the casing 1, and reference numeral 3 denotes a disk-shaped part of the pump portion 2. The outer housing 3 has a fuel inlet 4 formed therein. Reference numeral 5 denotes a disk-shaped inner housing that forms a pump housing together with the outer housing 3. The inner housing 5 has a turbine housing recess 5 </ b> A formed on a surface facing the outer housing 3, and has an axially- An outlet 6 is formed. 7 is a substantially C provided outside the turbine housing recess 5A.
The fuel passage 7 has one end communicating with the suction port 4 and the other end communicating with the discharge port 6. Reference numeral 8 denotes a turbine vane rotatably housed from the fuel passage 7 to the turbine housing recess 5A. The outer housing 3, the inner housing 5 and the turbine vane 8 constitute the pump unit 2.

Reference numeral 9 denotes a covered cylindrical discharge cover provided on the other end of the casing 1. The discharge cover 9 includes a substantially cylindrical tubular portion 9A and a lid portion 9B. A bottomed cylindrical bearing portion 9C is provided below the central portion of the lid portion 9B, and the bearing portion 9C is sandwiched therebetween. A pair of brush guides 9D is provided radially outward. At a position off the center of the lid 9B, a relief valve housing 10 and a discharge port 11 are provided as shown in FIG. Relief valve housing 10
Is a substantially cylindrical space that connects the pump unit 2 and the fuel injection device (not shown) in the casing 1, and in this relief valve housing 10, excess pressure in the casing 1 is relieved to the outside. A relief valve 12 as a pressure release valve is provided. The discharge port 11 is provided in the casing 1
This is a substantially cylindrical space that connects the pump unit 2 and a fuel injection device (not shown) in the inside, and a fuel pipe (not shown) is formed in the discharge port 11 when an electric motor unit described later stops. A check valve 13 is provided for maintaining a predetermined residual pressure state to prevent backflow of fuel.

[0005] Reference numeral 14 denotes a power supply connector formed to project upward together with the discharge port 11 from the discharge cover 9.
Inside the plate terminal 29 is provided.
External wiring on the power supply side is detachably connected to the power supply connector section 14 through a mating connector (not shown), so that power supply to a power supply motor section described later is performed via a plate terminal described later. Will be

Reference numeral 15 denotes a rotating shaft which is supported between the pump portion 2 and the discharge cover 9 via bushes 16 and 17, and projects from the lower end side of the rotating shaft 15 into the pump portion 2 so as to be a turbine vane. 8, and the upper end side of the rotating shaft 15 is inserted into the bearing 9 </ b> C of the discharge cover 9,
It is rotatably supported by a bush 16 in C and is configured to rotate integrally with the turbine vane 8. The bush 17 has its outer peripheral side fitted and fixed in the inner housing 5 of the pump section 2, and rotatably supports the rotating shaft 15 on the inner peripheral side. The outer housing 3 of the pump unit 2 is provided with a support 18 for rotatably supporting the lower end surface of the rotating shaft 15.

Reference numeral 19 denotes an electric motor section provided between the pump section 2 and the discharge cover 9. The electric motor section includes a rotor 20 and a commutator 21 which are inserted into the rotating shaft 15 and integrally rotate, and a discharge cover 9. And a pair of brushes 23 slidably inserted into the brush guide 9 </ b> D and constantly urged toward the commutator 21 by a spring 22, and supported by a yoke 24 located on the outer peripheral side of the rotor 20. It is constituted by a field magnet (hereinafter, referred to as a magnet) 25 as a pair of stators. As shown in FIG. 5, a ball 26 is provided on the upper end side of the brush guide 9D by means such as caulking, and a spring 22 is provided between the ball 26 and the brush 23 in a state where an initial load is applied. . The electric motor unit 19 rotates the rotor 20 by being externally supplied with electric power via the brush 23 and the like, and rotates the turbine vanes 8 in the pump unit 2 on the rotating shaft 15.
And it is configured to rotate integrally. Reference numeral 27 denotes a flexible lead wire called a pigtail which is connected to the brush 23 in advance, and the distal end side of the lead wire 27 is connected to a plate connector 28. 29 is an electric motor unit 19
Reference numeral 30 denotes a choke coil as a noise prevention coil for suppressing electric noise (noise) generated when the electric motor unit 19 is driven.

In FIG. 5, reference numeral 31 denotes a magnet holder provided in a yoke (not shown) for holding a magnet (not shown) as a stator. Since it is immersed in gasoline, the magnet cannot be fixed with an adhesive like a motor unit used in the air. Therefore, it is one of the fixtures for fixing the magnet even in gasoline. Such a magnet holder 31 has two annular portions 31a and 31b separated from each other, and both annular portions 31a and 31b.
It is roughly composed of two connecting portions 31c and 31d for connecting b at a predetermined separation distance. Magnets (not shown) are connected to both annular portions 31a and 31b and both connecting portions 31c.
And 31d are arranged in an arc-shaped space formed between the two. 32 is the electric motor unit 1
9 is a disk-shaped brush base provided with a brush 32 a for supplying power to the brush 9.

[0009]

However, in the conventional fuel pump, the magnet holder 31 and the brush base 32 are separately formed so that the magnet holder 31 for fixing the magnet is required as a special part. Therefore, there is a problem that the number of parts is large.

The present invention has been made to solve the above-described problems, and has as its object to provide a fuel pump having a structure with a reduced number of parts.

[0011]

A fuel pump according to the present invention has an electric motor section having a resin magnet holder for holding a field magnet, and a resin brush having a brush for supplying power to the electric motor section. A base, a pump unit disposed at one end of the electric motor unit and sucking fuel by the rotational driving force of the electric motor unit, and a fuel unit disposed at the other end of the electric motor unit and sucked by the pump unit And a discharge cover that discharges oil to the outside,
The magnet holder and the brush base are integrally formed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a schematic perspective view showing a magnet holder and a brush base in a fuel pump according to Embodiment 1 of the present invention. Note that among the constituent elements of the first embodiment, those that are common to the constituent elements of the conventional fuel pump shown in FIGS. 2 to 5 are denoted by the same reference numerals, and description of those parts will be omitted.

The fuel pump according to the first embodiment is provided with the basic components of the conventional fuel pump shown in FIGS. 2 to 5, and the feature thereof is that the fuel pump is separately provided as shown in FIG. The point is that the magnet holder 31 and the brush base 32 are integrally formed.

That is, the fuel pump according to the first embodiment has an electric motor section 19 having a magnet holder 31 for holding a magnet 25, and a brush base 32 having a brush 32a for supplying power to the electric motor section 19. When,
The electric motor unit 19 is disposed at one end of the electric motor unit 19.
And a discharge cover 9 that is disposed at the other end of the electric motor unit 19 and discharges the fuel sucked by the pump unit 2 to the outside.
The brush base 32 is connected to the electric motor unit 1 as shown in FIG.
9 and is integrally formed by being fitted into the annular portion 31a of the magnet holder 31. In FIG. 1, reference numeral 40 denotes a leaf spring integrally provided on both sides of each of the connecting portions 31c and 31d of the magnet holder 31.
Each of the arc-shaped or C-shaped magnets 25 is fixed by being pressed against the inner peripheral surface of the yoke 24 that covers the magnet holder 31 from outside by the leaf spring 40. Also, 41
Is a mark provided on the magnet holder 31 for positioning in the rotation direction of the fuel pump.

Next, the assembly around the brush base 32 integrally formed with the magnet holder 31 will be described. First,
After assembling all the components such as the brush 32 a, the plate terminal 29, and the choke coil 30 on the brush base 32 fitted in the annular portion 31 a of the magnet holder 31, the brush base 32 is removed from above by the discharge cover 9. cover. Next, the magnet 25 is fitted into the yoke 24 with the magnet 25 mounted in the space between the connecting portions 31c and 31d of the magnet holder 31. Since the magnet 25 is pressed against the inner peripheral surface of the yoke 24 by the leaf spring 40, it is securely fixed to the magnet holder 31.

As described above, according to the first embodiment, since the magnet holder 31 and the brush base 32 are integrated, the number of parts can be reduced, so that the product cost can be reduced. it can.

According to the first embodiment, the magnet holder 31 and the brush base 32 can be mounted simultaneously, so that the assemblability can be improved.

According to the first embodiment, since the magnet holder 31 and the brush base 32 are integrated,
There is no need to reposition the magnet holder 31 and the brush base 32, and the magnet holder 31 and the brush base 32 can be easily positioned with respect to the fuel pump.

In the first embodiment, the magnet holder 31 and the brush base 32 are integrated by the above-described fitting. However, the present invention is not limited to the above-described fitting, and for example, the magnet is formed by integral molding. Holder 3
1 and the brush base 32 may be integrated.

[0020]

As described above, according to the present invention, an electric motor section having a resin magnet holder for holding a field magnet, and a resin brush having a brush for supplying power to the electric motor section A base, a pump unit disposed at one end of the electric motor unit and sucking fuel by the rotational driving force of the electric motor unit, and a fuel unit disposed at the other end of the electric motor unit and sucked by the pump unit Since the magnet holder and the brush base are integrally formed in the fuel pump including the discharge cover that discharges the oil to the outside, the number of parts can be reduced, and the product cost can also be reduced. Further, since the magnet holder and the brush base can be mounted at the same time, the assemblability can be improved. Furthermore, since the magnet holder and the brush base are integrated, there is no need to reposition the magnet holder and the brush base, and the magnet holder and the brush base can be easily positioned with respect to the fuel pump.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a magnet holder and a brush base in a fuel pump according to Embodiment 1 of the present invention.

FIG. 2 is a longitudinal sectional view showing the internal structure of a conventional fuel pump.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a top view of the conventional fuel pump shown in FIGS. 2 and 3;

FIG. 5 is a schematic perspective view showing a magnet holder and a brush base in an electric motor section of a conventional fuel pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Pump part 3 Outer housing 4 Suction port 5 Inner housing 5A Turbine accommodating recess 6 Discharge port 7 Fuel passage 8 Turbine vane 9 Discharge cover 9A Cylindrical part 9B Cover part 9C Bearing part 9D Brush guide 10 Relief valve accommodating part 10a Communication port 10b supply port 11 discharge port 11a communication port 11b opening 12 relief valve (pressure release valve) 12a ball (valve element) 12b coil spring (biasing member) 12c holder 13 check valve (fuel check valve) 13a valve element 13b holder 14 Power supply connector part 15 Rotating shaft 16, 17 Bush 18 Support body 19 Electric motor part 20 Rotor 21 Commutator 22 Spring (biasing member) 23 Brush 24 Yoke 25 Field magnet 26 Ball 27 Lead wire 28 Plate connector 29 Plate terminal 3 Choke coil 31 magnet holder 32 brush base 32a brush 40 leaf spring 41 positioning marks

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // H02K 1/17 H02K 1/17 F term (reference) 3H022 AA00 BA03 CA50 CA56 DA19 DA20 3H034 AA01 AA15 BB04 BB09 BB12 CC05 DD22 DD28 DD30 EE05 EE12 EE14 5H613 AA01 AA02 BB04 BB07 BB09 BB25 BB38 GA01 GA12 GB02 GB09 GB17 KK02 KK05 PP02 PP03 SS08 5H622 CA02 CA10 CA12 PP10 PP14 PP17

Claims (1)

[Claims] 1. An electric motor section having a resin magnet holder for holding a field magnet, a resin brush base having a brush for supplying power to the electric motor section, and one end of the electric motor section. A fuel pump including: a pump unit provided to suck fuel by a rotational driving force of the electric motor unit; and a discharge cover disposed at the other end of the electric motor unit to discharge the fuel sucked by the pump unit to the outside. 3. The fuel pump according to claim 1, wherein the magnet holder and the brush base are integrally formed.