JP2002218712A - Brush for fuel supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush for a fuel supply device which can maintain the conditions of mounting in proper stability for a long period, without sulfurating granules by sulfuric components contained in fuel, in a brush used for the fuel supply device, for instance, in an automobile engines or the like, particularly that fix pig tail with granules to a mounting hole formed in a brush main unit. SOLUTION: This brush is characterized by providing a brush main unit 11, consisting of carbon or the like and a pig tail 12 fixedly inserted into a mounting hole 11b formed in this brush main unit, inserting this pig tail into the mounting hole, and fixedly press fitting a granule of sulfide generating energy larger than that of copper to the periphery of the pig tail in this mounting hole. Since the granules of sulfide generate energy larger than that of copper, for instance, thin powder, gold powder, nickel powder, zinc powder, etc., or these powders can be used suitably combined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush used for a fuel supply device of, for example, an automobile engine.

[0002]

2. Description of the Related Art Conventionally, in a brush used for a fuel supply device of an automobile engine or the like, for example, a brush main body formed by compacting carbon or the like into a predetermined shape and a mounting hole formed in the brush main body are inserted and fixed. Those with pigtails (leads) are known. Copper wire is usually used as this type of pigtail, and one end of the pigtail is inserted into a mounting hole formed in the brush body,
Generally, copper powder around the pigtail in the mounting hole is press-fitted and fixed.

[0003] However, in the brush used for the fuel supply device as described above, the brush comes into contact with the fuel flowing through the hood section or the motor section that pumps up and discharges the fuel, and the sulfur component contained in the fuel reduces the sulfur component. It reacts with the pigtail formed of copper wire and the copper powder that fixes the pigtail to produce copper sulfide, which makes the pigtail brittle and breaks,
The copper sulfide generated between the brush and the holder or the like holding the brush causes a problem such as hard brushing.

[0004] In order to solve such a problem, the entire outer peripheral surface of the pigtail is plated with a material having a higher sulfide generation energy than copper, and the same copper plating as described above is also applied to the copper powder for fixing the pigtail. It has been proposed to perform a treatment to suppress the sulfidation reaction (see, for example, JP-A-9-1154261).

[0005]

However, it is very difficult and troublesome to perform the above-mentioned plating treatment, in particular, to uniformly coat the entire outer peripheral surface of the copper powder, and even if plating can be performed evenly. When press-fitting the plated copper powder into the mounting hole to fix the pigtail, the plated portion of the copper powder is broken and the copper of the base material is exposed. for that reason,
There is a problem that copper sulfide is generated on the surface of the exposed portion, causing the brush to stick between the brush and a holder for holding the brush.

The present invention has been proposed in view of the above-mentioned problems, and the powder for fixing the pigtail to the mounting hole formed in the brush body is not sulfided by the sulfur component contained in the fuel. It is another object of the present invention to provide a brush for a fuel supply device, which can maintain a stable mounting state for a long time.

[0007]

To achieve the above object, a fuel supply device brush according to the present invention has the following configuration.

That is, a brush body made of carbon or the like,
A pigtail inserted and fixed in a mounting hole formed in the brush body, and the pigtail is inserted into the mounting hole, and around the pigtail in the mounting hole,
A powder fluid having a larger sulfide generation energy than copper is press-fitted and fixed. As the powder fluid having higher sulfide generation energy than copper, for example, at least one of tin powder, gold powder, nickel powder, and zinc powder can be used.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on an embodiment shown in the drawings. 1A and 1B show an embodiment of a brush for a fuel supply device according to the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a front view.

The brush 1 for a fuel supply device according to the present embodiment comprises:
The brush body 11 includes a brush body 11 and a pigtail 12, and in the present embodiment, the brush body 11 is formed into a predetermined shape by compacting a conductive powder such as carbon. Although the material and configuration of the pigtail 12 are appropriately determined, in the present embodiment, a nickel-plated copper wire having a sulfur-resistant property on its surface, particularly a stranded wire in the case of the drawing, is used.

The brush body 11 is provided with a projection 11a for engaging a compression coil spring or the like, which will be described later, and a mounting hole 11b for the pigtail 12.
The pigtail 12 is fixed to the brush body 11 by inserting one end of the pigtail 12 into the hole and press-fitting the powder 13 having a larger sulfide generation energy than copper around the pigtail 12 in the mounting hole 11b. In this embodiment, tin powder is used as the powder 13.

In manufacturing the brush 1 as described above, for example, a conductive powder such as carbon is formed into a predetermined shape by compacting or the like, and the protrusion 11a and the mounting hole 11b are formed by firing. Brush body 1 having
Prepare No. 1. Then, the mounting hole 1 of the brush body 11
One end of the pigtail 12 may be inserted into 1b, and tin powder may be filled around the pigtail 12 in the mounting hole 11b and then pressurized. At that time, pigtail 12
May be cut to a predetermined length before being attached to the brush body 11, or may be cut after being attached.

FIG. 2 is a partial longitudinal front view showing an example of a fuel supply device 2 using the above-described fuel supply device brush 1. In the fuel supply device 2, a fuel discharge pump not shown is shown. A driving motor is built in. Reference numeral 21 denotes a motor cover for covering the motor. A brush insertion portion 21a as a brush holder is integrally formed on the upper portion of the cover 21, and the main body 11 of the brush 1 slides in the insertion portion 21a in the vertical direction in the figure. It is arranged to be accommodated as possible.

A compression coil spring 22 is housed in the upper portion of the brush body 11 in the insertion portion 21a so as to engage with the protrusion 11a formed on the upper portion of the brush body 11, and the brush body 11 is held by the spring 22. , And is always in pressure contact with the upper surface of a commutator 24 provided integrally with the rotor 23 of the motor. In the figure, reference numeral 25 denotes a terminal portion for conductively connecting the brush main body 11 to a power source or the like not shown in the drawing via the pig tail 12, and the pig tail 12 is conductively connected to the terminal portion.

As described above, the brush 1 for the fuel supply device according to the present embodiment uses the granular material having a larger sulfide generation energy than copper as the granular material for fixing the pigtail 12 to the brush body 11. Unlike the conventional case, the copper component is not exposed to the surface of the pigtail fixing portion and does not react with the sulfur component in the fuel to form sulfides such as copper sulfide, thereby holding the brush. The pump performance can be maintained satisfactorily without causing a hard contact with the holder or the like.

In the above embodiment, tin powder is used as the powder having a larger sulfide generation energy than copper, but gold powder, nickel powder, zinc powder, or the like may be used.
Alternatively, they can be appropriately mixed and used.

Further, in order to increase the bonding strength of the above-mentioned powder and granules,
If necessary, a protective material such as a synthetic resin, including the surface of the granular material pressed into the mounting hole 11b or the surface of the brush body 11, may be penetrated and solidified, or may be provided by being covered. Specifically, for example, if a phenolic resin or the like is applied to the surface of the powder or the particle including the brush body 11 and solidified by performing a thermosetting treatment or the like, the powder or the particle can be more firmly fixed. It becomes possible.

[0018]

As described above, the fuel supply device brush 1 according to the present invention includes a brush body 11 made of carbon or the like,
A pigtail 12 inserted and fixed in a mounting hole 11b formed in the brush body 11;
2 into the mounting hole 11b.
1b, the powdery material having a larger sulfide generation energy than copper is filled around the pigtail 12 and fixed by pressing. Therefore, tin is used as the powdery material for fixing the pigtail as in the prior art. As in the case of using plated copper powder etc., the tin plating is destroyed at the time of pressurization and the copper powder is exposed, and there is no sulfide such as copper sulfide generated by reacting with the sulfur component in the fuel In addition, this does not cause a hard contact with a holder or the like that holds the brush, and has an effect that the pump performance of the fuel supply device can be favorably maintained for a long period of time.

[Brief description of the drawings]

FIG. 1A is a plan view showing an embodiment of a fuel supply device brush according to the present invention. (B) is the front view.

FIG. 2 is a partial vertical front view showing an example of a fuel supply device using the brush.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brush for fuel supply device 11 Brush main body 12 Pigtail 13 Powder fluid 2 Fuel supply device 21 Motor cover 22 Compression coil spring 23 Rotor 24 Commutator

[Procedure amendment]

[Submission date] January 23, 2001 (2001.1.2)
3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003] However, in the brush used in the fuel supply device as described above, port for discharging pumped fuel
Contact with the fuel flowing through the pump section and the motor section, the sulfur component contained in the fuel reacts with the pigtail formed by the copper wire and the copper powder that fixes the pigtail to form copper sulfide, and the pigtail Becomes brittle and breaks,
The copper sulfide generated between the brush and the holder or the like holding the brush causes a problem such as hard brushing.

Claims (2)

[Claims] 1. A brush body made of carbon or the like, and a pigtail inserted into and fixed to a mounting hole formed in the brush body. The pigtail is inserted into the mounting hole, and the periphery of the pigtail in the mounting hole is provided. And a powder having a larger sulfide generation energy than copper. 2. The fuel supply device according to claim 1, wherein at least one of tin powder, gold powder, nickel powder, and zinc powder is used as the powder having higher sulfide generation energy than copper. brush.