JP2561580Y2 - Fuel pump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel pump which is preferably used for supplying fuel in a fuel tank to an engine of an automobile, for example, and more particularly, a spring for pressing a brush can be temporarily set at the time of assembly. Related to the fuel pump.

[0002]

2. Description of the Related Art FIGS. 3 to 7 show a conventional fuel pump.

[0003] In the drawings, reference numeral 1 denotes a casing of a fuel pump, and the casing 1 has a cylindrical casing main body 2.
And a pump housing 3 having both ends of the casing main body 2 covered and an upper cover 4, and a fixed shaft 5 is provided between the pump housing 3 and the upper cover 4. The pump housing 3 is provided with a suction port 3A through which fuel is sucked, and the upper cover 4 is provided with a discharge port 4A.

Reference numeral 6 denotes a turbine type pump provided in the pump housing 3. The pump 6 is driven to rotate by a motor 7, which will be described later, to supply fuel in a fuel tank (not shown). While sucking through the suction port 3A of the pump housing 3, the gas flows through the casing body 2 and is discharged from the discharge port 4A of the upper cover 4 to the outside.

[0005] Reference numeral 7 denotes a motor section comprising a DC motor for driving the pump section 6 to rotate. The motor section 7 includes a rotor 7A rotatably provided on the fixed shaft 5 and an outer peripheral side of the rotor 7A. And a pair of stators 7B, 7B (only one is shown) attached to a yoke 8 formed in a cylindrical shape. A commutator 7C is integrally provided on the upper end side of the rotor 7A.
Each of the brushes 12 described below slides on the outer periphery of C to supply power to the coil of the rotor 7A.

[0009] Reference numerals 9 and 9 are located on the lower surface side of the upper cover 4.
FIG. 2 shows a pair of brush holders formed integrally with the upper cover 4; each of the brush holders 9 is relatively arranged radially outside a commutator 7C of a motor unit 7; It is movably loosely fitted. As shown in FIG. 4, a guide groove 9B for guiding a spring 14 described later is formed on one side surface 9A of each of the brush holders 9, and a lead wire 13 described later is guided on a lower surface 9C. A lead wire guide groove 9D is formed. Further, a lower surface 9C of each of the brush holders 9 has a temporary setting portion 1 described later.
5 are provided.

Reference numeral 10 denotes a pair of conductive plates (only one is shown) protruding downward from the upper cover 4 adjacent to each brush holder 9, and each of the conductive plates 10 protrudes from the upper surface of the upper cover 4. Is electrically connected to the pair of connection terminals 11, 11.

Reference numerals 12 and 12 denote slidably provided brushes 9 in the respective brush holders 9 and formed in a prismatic shape from a conductive material such as carbon. One end of each brush 12 is also shown in FIG. As shown, it is a concave curved sliding contact portion 12A which is in sliding contact with the commutator 7C of the motor portion 7. A pressing portion 1 of a spring 14 is provided on the other end surface side of each brush 12.
A V-shaped locking groove 12B in which the 4A is locked is formed.

Reference numerals 13 and 13 denote lead wires formed by twisting a large number of thin electric wires. One end of each of the lead wires 13 is connected to the brush 12 via a lead wire guide groove 9D of the brush holder 9. Each connection terminal 11 and each brush 12 are electrically connected by being connected and the other end side being connected to the conductive plate 10.

Reference numerals 14 and 14 denote springs wound around the conductive plate 10 and wound around the outer periphery of each conductive plate 10. Each of the springs 14 has its base end engaged with the upper cover 4 side. When the pressing portion 14A on the distal end side is locked in the locking groove 12B of the brush 12, the brush 12 is pressed inward in the radial direction (to the commutator 7C side) with a predetermined spring load.

Reference numerals 15 and 15 denote lower surface portions 9 of the respective brush holders 9.
C shows a temporary set portion as a square plate-shaped protrusion protruding downward and located on the side of the spring 14 of C. In each of the temporary set portions 15, a pressing portion 14A of the spring 14 is temporarily set (engaged). Stop).

The fuel pump according to the prior art has the above-described configuration, and the assembling procedure is firstly described with reference to FIGS.
As shown by a two-dot chain line, the base end side of each spring 14 is engaged with the upper cover 4, and each pressing portion 14 </ b> A on the distal end side is temporarily set in each temporary setting portion 15. In this state, in order to arrange the commutator 7C of the motor unit 7 radially inside each brush 12, the commutator 7C is connected to the rotor 7A.
Together with the upper cover 4 via the fixed shaft 5, and then the pressing portion 14A of each of the springs 14 is locked in the locking groove 12B of each brush 12 using an elongated rod-shaped jig, and set properly. Each brush 12 is pressed against the commutator 7C by the spring force of each spring 14. Next, the casing body 2 with the pump housing 3 fixed to the yoke 8 and the lower end side is assembled to the upper cover 4, and the upper end of the casing body 2 is fixed to the upper cover 4 by means such as caulking. To manufacture.

In the fuel pump assembled as described above, each connection terminal 11 provided on the upper cover 4 is connected to a power source, and power is supplied from each brush 12 to the rotor 7A via the commutator 7C. By rotating the rotor 7A, the pump unit 6 is rotated in the pump housing 3 so that the fuel sucked from the suction port 3A is supplied to the casing body 2.
While flowing through the inside, the pressure is supplied from a discharge port 4A to a fuel injection valve (neither is shown) or the like via a fuel pipe.

[0014]

In the fuel pump according to the prior art described above, a guide groove 9B and a lead wire guide groove 9D are formed in one side surface 9A and a lower surface 9C of each brush holder 9, respectively. As a result, the lead wire 13 is allowed to move to the commutator 7C side together with the brush 12, so that even if the sliding contact portion 12A side of each brush 12 is worn down with the operation of the fuel pump, each brush 12 Is moved together with each lead wire 13 by the spring force of each spring 14 toward the commutator 7C, whereby the brushes 12 can be sequentially supplied to supply power to the rotor 7A for a long period of time.

However, since each of the lead wires 13 is formed by twisting a thin electric wire in order to obtain a degree of freedom in assembling, each of the lead wires 13 is attached to the cover 4 at the time of assembling or the like. The product may be in a state where it is pressed against. When the fuel pump is operated in this state, as shown in FIG. 6 and FIG.
When each of the lead wires 13 passes through the temporary set portion 15 protruding from the lower surface portion 9C of each of the brush holders 9, the respective lead wire 13 is connected to the lead wire guide groove 9D of the temporary set portion 15.
Side corner A may be caught.

As a result, the movement of each brush 12 toward the commutator 7C is stopped against the spring force of each spring 14, and even if each brush 12 is worn down, each brush 12
Is not supplied, not only poor contact between the commutator 7C and each of the brushes 12 occurs, but also the fuel pump becomes inoperable due to inability to supply power with most of the brushes 12 remaining. However, there is a problem that the reliability and life of the device are greatly reduced.

The present invention has been made in view of the above-described problems of the prior art, and can prevent a lead wire from being caught on a projection and prevent a poor contact between a brush and a commutator of a motor unit. It is an object to provide a fuel pump as described above.

[0018]

In order to solve the above-mentioned problems, a feature of the structure adopted in the present invention is that a slope is provided on the guide groove side of the protrusion so as to be gradually inclined toward the guide groove. That is.

[0019]

According to the above construction, even if the lead wire moves to the commutator side of the motor unit together with the brush due to wear of the brush, the protrusion prevents the lead wire from being caught by the protrusion. Extend the life of the brush.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those in the prior art shown in FIGS. 3 to 7 are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 21 denotes a pair of brush holders (only one of which is shown) which are located on the lower surface side of the upper cover 4 and are formed integrally with the upper cover 4 according to the present embodiment. Like the brush holders 9 described in the related art, are disposed relatively outside the commutator 7C of the motor unit 7 in the radial direction, and the brushes 12 are slidably loosely fitted therein. . In addition, each brush holder 21
A guide groove 21B for guiding the spring 14 is formed in one side surface portion 21A, and a lead wire 1B is formed in the lower surface portion 21C.
A lead wire guide groove 21 </ b> D for guiding 3 is formed.

Reference numeral 22 denotes a temporary set portion (only one is shown) as a protrusion according to the present embodiment.
Is substantially the same as each temporary setting unit 15 described in the prior art,
Each of the brush holders 21 is formed in the shape of a rectangular plate protruding downward and located on the side of the spring 14 of the lower surface 21C of the brush holder 21. At the time of assembly, as shown by a two-dot chain line in FIG.
Although the four pressing portions 14A are temporarily set, each of the temporary setting portions 22 has an inclined portion 21A that is gradually inclined upward from the middle portion in the width direction toward the lead wire guide groove 21D side. Is formed.

The fuel pump according to this embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

However, in the present embodiment, each of the temporary set portions 22 serving as the protrusions is directed upward from the widthwise intermediate portion of each of the temporary set portions 22 toward the lead wire guide groove 21D. Since the inclined portion 22A is formed so as to be inclined, the respective lead wires 13 are assembled in a state of being pressed against the cover 4 at the time of assembling and the like, and the brushes 12 are driven by operating the fuel pump in this state. Even when each lead wire 13 passes through the temporary set portion 22 protruding from the lower surface portion 21C of each brush holder 21 as shown in FIG. 2, even if the lead wires 13 pass through the temporary set portion 22, as shown in FIG. Each lead wire 13 can be passed without being caught.

Thus, according to the present embodiment, each of the lead wires 13 is caught on each of the temporary setting portions 22 by the inclined portions 22A.
Each brush 12 is reliably prevented by the spring force of each spring 14 from the commutator 7C.
The brushes 12 can be moved to the side and supplied one by one to prevent the occurrence of poor contact between the commutator 7C and each brush 12 and to use each brush 12 for a long time up to the wear limit. Therefore, the reliability and life of the fuel pump can be greatly improved.

In the above embodiment, the inclined portion 22A of the temporary set portion 22 as a projection is illustrated as being linear and angular, but the present invention is not limited to this.
2A may be inclined in an arc shape. Further, the edge portion may be an arc-shaped R portion. In this case, the lead wire 13 can be more effectively prevented from being caught.

Further, in the above-described embodiment, a turbine type fuel pump has been described as an example of the fuel pump. However, a fuel pump of another type such as a roller vane type may be used instead.

[0028]

As described in detail above, according to the present invention, since the inclined portion which is gradually inclined toward the guide groove is provided on the guide groove side of the projection, the brush is worn down, and the lead wire is formed together with the brush. Even if it moves to the commutator side of the motor part, the lead wire can be prevented from being caught on the projection,
In addition to reliably preventing contact failure between the brush and the commutator, the brush can be used for a long time up to the wear limit, and the reliability and life of the fuel pump can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a brush holder, a temporary setting unit, and the like according to an embodiment of the present invention.

FIG. 2 shows the state in which the brush is worn down, as indicated by arrow II in FIG.
FIG. 2 is a plan view in the −II direction.

FIG. 3 is a longitudinal sectional view showing a fuel pump according to the related art.

FIG. 4 is an enlarged front view showing a main part in FIG. 3;

FIG. 5 is a vertical sectional view taken in the direction indicated by arrows VV in FIG. 4;

FIG. 6 is a front view similar to FIG. 4, showing a state in which a lead wire is hooked on a corner of a temporary setting section.

7 is a plan view in the direction of arrows VII-VII in FIG. 6;

[Explanation of symbols]

 2 Casing body 3 Pump housing 4 Upper cover 6 Pump part 7 Motor part 7A Rotor 7B Stator 7C Commutator 11 Connection terminal 12 Brush 13 Lead wire 14 Spring 21 Brush holder 21D Lead wire guide groove 22 Temporary set part (projection part) 22A Inclined part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location H02K 13/00 H02K 13/00 T

Claims (1)

(57) [Scope of request for utility model registration] 1. A housing having a cylindrical shape, both ends of which are covered by a pump housing and an upper cover; a pump provided in the pump housing; and a pump disposed in the casing body for rotating the pump. A motor part comprising a rotor having a commutator on the upper cover side and a stator provided on the outer peripheral side of the rotor, and provided integrally with the upper cover located on the outer peripheral side of the commutator of the motor part. A brush holder having a lead wire guide groove extending in a radial direction, a brush slidably provided in the brush holder, and supplying power to a rotor via the commutator; A lead wire connected to the brush via a groove, the other end of which is connected to a connection terminal provided on the upper cover, and attached to the upper cover adjacent to the brush holder; In a fuel pump, comprising: a spring for pressing the brush toward the commutator; and a projection protruding from a spring-side surface of the brush holder for temporarily setting the spring when the spring is attached to the upper cover. A fuel pump, characterized in that an inclined portion that is gradually inclined toward the guide groove is provided on the guide groove side of the protrusion.