JPH0242055Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a motor-type fuel pump for supplying fuel in a fuel tank to an engine side.

[Problems to be solved by the prior art and the invention]

Generally, this type of motor fuel pump is built into the fuel tank of a vehicle such as an automobile, and is installed to forcibly supply fuel to the engine. It is constructed by assembling a supporting part in which a brush holder for a brush that slides in elastic contact with the commutator of the rotor is integrally formed to protrude into a magnet holder for holding a magnet arranged on the outer diameter side of the rotor. It's becoming like that. However, in the case of such a motor-type fuel pump, it is extremely difficult to assemble the brush, which is urged to protrude from the brush holder by the bullet, so that it comes into sliding contact with the commutator during the assembly work of the motor part. The workability was significantly inferior. Therefore, a locking claw is provided on the brush holder, and a pigtail connected to the brush is locked to the locking claw to prevent the brush from protruding from the brush holder, and the brush is placed in a retracted position where it does not come into sliding contact with the commutator. It has been proposed to assemble the brush while holding it in place, and then remove the pigtail from the locking pawl so that the brush is brought into sliding contact with the commutator in a pressing manner. However, even in this case, since the commutator part is covered by the magnetic holder, it is necessary to create a viewing window on the magnetic holder side so that the pigtail can be removed from the locking claw. However, there was a problem in that the viewing window had to be aligned and assembled each time so that it was always located at a position facing the locking claw, resulting in poor workability.

[Means to solve the problem]

In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a motor-type fuel pump that can eliminate these drawbacks. A pump part is provided on one side of the casing in the direction of the rotational axis, and a support part is provided on the other side, and the fuel that flows into the casing from the pump part on one side is discharged from the support part side via the motor part. A motor-type fuel pump configured to fixedly support both ends of a central shaft between the pump part and the support part, and rotatably support the rotor on the central shaft, and The support part includes an engaging protrusion that serves as a bullet holder for a brush biasing bullet, an inner member in which a brush holder disposed on the inner diameter side of the engaging protrusion is integrally formed to protrude toward the motor part, and an electrode plate. The outer member to be implanted is integrally positioned and formed by passing a protrusion formed on the outer member through a positioning hole drilled in the inner member, and the protrusion of the outer member is penetrated. Connect the lead wire and the pigtail pulled out from the brush so as to protrude from the brush holder toward the motor section.
The wires are connected by penetrating the inner member of the choke coil interposed between the opposing surfaces of the inner and outer members and connecting to the ends of each coil pulled out to the motor side, and furthermore, a pigtail is connected to the brush holder. A locking pawl is provided to hold the brush in a position where it does not come into sliding contact with the commutator, and a magnet is interposed between the inner member and the pump portion to hold the magnet disposed on the outer diameter side of the rotor. The net holder is provided with a fitting groove at a position facing the locking claw, into which the engagement protrusion fits and for assembling the inner member to the magnet holder in a positioned state. Furthermore, it is characterized in that it is opened wide toward the motor section side so as to serve as a viewing window through which the pigtail that is locked to the locking pawl can be removed.

With this configuration, the present invention uses a fitting groove formed in the magnetic holder to assemble the supporting part in a positioned state to the magnetic holder.
The pigtail can be effectively used as a viewing window when removing the pigtail from the locking claw. [Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a motor-type fuel pump in which the present invention is implemented. Bearing part 1 on the side
It is constructed by housing motor assemblies each having a number 0. That is, a rotor 5 is rotatably supported on a central shaft 6 to which a pump part 3 is attached at one end, and this rotor 5 is fitted into a magnet holder 7 to which a magnet 8 is fixedly attached. As will be described later, the motor 4 with the pump part 3 is formed by assembling the support part 10 on which the brush holder 9 for the brush 16 is formed to the magnetic holder 7, and by fitting this into the motor case 2. A motor-type fuel pump 1 is formed, and the pump part 3 is operated by the rotation of the rotor 5, whereby fuel flows from the pump part 3 side into the rotor chamber R inside the magnetic holder 7. The fuel is forcibly fed from the discharge port 27 on the side of the support portion 10 to the side of the engine (not shown).

The support portion 10 includes an outer member 1 to which a damper 11 for rectifying the flow of the supplied fuel is attached.
2, and an inner member 13 integrally formed with an engaging protrusion 17 and a brush holder 9 disposed on the inner diameter side of the engagement protrusion 17, which will be described later. A protrusion 15 is formed on the outer member 12 so that a lead wire 14a that is connected to a pair of electrode plates 14 implanted in the outer member 12 and extends to the rotor chamber R side is inserted through each of the protrusions 15.
Both members 12 and 13 are integrated by fitting into a positioning hole 13a formed in the inner member 13 to form the support portion 10. In this embodiment, by making the diameters of both the protrusions 15 and the positioning holes 13a different, it is possible to prevent the relationship between the installation positions of the members 12 and 13 from being reversed.

On the other hand, the brush 16 fitted into the brush holder 9 so as to be freely retractable is moved by the bullet 18 housed inside the brush holder 9 such that the engaging protrusion 17 of the inner member 13 serves as a bullet receiver. The pigtail 19 is designed to constantly protrude from the brush holder 9 and come into sliding contact with the commutator 26 in an elastic manner. The brush 16 is fitted into the guide groove 20 and moves in the guide groove 20 following the movement of the brush holder 9 into and out of the brush 16 . A locking pawl 21 is protruded from the bottom of the guide groove 20, and by locking the pigtail 19 around the locking pawl 21, the brush 16 can be removed from the brush holder 9. It is now possible to control the infestation movement. Then, the brush holder 16 is retracted into the brush holder 9 against the bullet 18, and at the retracted position where the brush holder 16 does not come into sliding contact with the commutator 26, the pigtail 19 is locked with the locking pawl 21, and the pigtail 19 is held in this position. If the support part 10 is assembled to the magnetic holder 7 in the held state, the motor 4 with the pump part 3 will be formed as described above. In this case, by fitting the engaging protrusion 17 into the fitting groove 22 provided on the magnetic holder 7, the supporting portion 10 is fitted into the magnetic holder 7.
In this embodiment, the fitting groove 22 has a substantially convex shape.
In the assembled state of the support portion 10 in which the engagement protrusion 17 is fitted into the fitting groove 22, the motor 4 side is further opened, and this opening forms a viewing window 23 through which the brush holder 9 can be viewed. . The pigtail 19 that is locked to the locking claw 21 can be removed from the viewing window 23. Further, the fitting groove 22 and the engaging protrusion 17 are formed with different widths, respectively, so as to prevent the mounting relationship of the supporting part 10 to the magnetic holder 7 from being reversed.

Further, a chiyoke coil 24 is interposed in the space S between the inner and outer members 12 and 13, and each coil end of the chiyoke coil 24 is connected to the inner member 13.
It penetrates through and protrudes toward the rotor chamber R side. As described above, this coil end is connected to the lead wire 14a arranged from the electrode plate 14 into the rotor chamber R by the protrusion 15, and the pigtail 19 drawn out from the brush 16 and arranged inside the rotor chamber R. The lead wire 14a and the pigtail 19 are connected to each other by this.

The center shaft 6, on the side of the support portion 10, is fitted into a support portion 12a provided on the outer member 12, and 25 is an O-ring.

In the embodiment of the present invention constructed as described above, in order to incorporate the motor-type fuel pump 1, the pump section 3, rotor 5, magnetic holder 7, magnet 8, and support section 10 are integrated in advance, and then the case 2 is assembled. However, at this time, in the present invention, the pigtail 19 is locked to the locking claw 21 and the brush 16 is assembled in a recessed position so as not to interfere with the commutator 26. Therefore, the work of assembling the motor-type fuel pump 1 becomes extremely easy.

That is, in the present invention, the pigtail 19 is connected to the locking claw 2.
1 to hold the brush 16 in a recessed position where it does not come into sliding contact with the commutator 26.
When the support part 10 is assembled, the brush 16 can be easily assembled without any interference. After the support part 10 is assembled in this way, it is necessary to remove the pigtail 19 from the locking pawl 21 and force the brush 16 into sliding contact with the commutator 26 in an elastic manner. The pigtail 19 can be removed very easily through the viewing window 23 formed at 7, thereby reliably preventing inconveniences such as incomplete removal of the pigtail 19 or forgetting to remove it. be able to.

Moreover, this viewing window 23 is fitted with the engaging protrusion 17 of the inner member 13 of the support portion 10, and the inner member 13
The fitting groove 22 provided in the magnetic holder 7 is simply lengthened toward the motor section in order to assemble the magnet into the magnetic holder 7 in a positioned state, thereby making effective use of the fitting groove 22. . Therefore, there is no need to separately form a dedicated viewing window.
Furthermore, since the engaging protrusion 17 is also used as a receiver for the bullet 18, it not only contributes significantly to the dual use of parts, but also simplifies the structure.Furthermore, in this case, the brush holder 9 An engagement groove 2 arranged on the inner diameter side of the engagement protrusion 17 and into which the engagement protrusion 17 is fitted.
As a result, there is no need to align the viewing window 22 with the position of the locking claw 21 each time during assembly, and the assembly work is simplified. It can greatly contribute to improving sexual performance.

Further, the chiyoke coil 24 is connected to the inner and outer members 12,
13, it is possible to secure a wide internal space of the rotor chamber R, and it also avoids the problem of damage caused by the tool being scratched on the chain yoke coil 24 when removing the pigtail 19 from the locking pawl 21. There is also the advantage that Furthermore, when assembling the support part 10, since the protrusion 15 through which the lead wire 14a is inserted is also used as an assembly member for both the inner and outer members 12, 13, the lead wire can be assembled and formed at the same time as the support part 10 is assembled. Since the lead wire 14a can be assembled through the rotor chamber R side, there is no need to pass the lead wire 14a through the rotor chamber R side each time, and the workability of the assembly work is improved here as well. be. Furthermore, in this case, assembly errors are completely eliminated by the simple structure of simply changing the diameter of the protrusion 15. Furthermore, when assembling the support part 10 to the magnetic holder 7, by making the sizes of the respective fitting grooves 22 and the engaging protrusions 17 different, assembly errors are completely eliminated, which makes the work extremely easy. It can be used to measure sexual improvement.

[Effect]

In summary, since the present invention is constructed as described above, when assembling a motor-type fuel pump, by locking the pigtail to the locking pawl, the brush is placed in a position where it does not come into sliding contact with the commutator. The magnetic holder is configured so that it can be held and assembled easily, and after assembly, the pigtail, which is locked to the locking pawl, can be easily removed from the viewing window formed in the magnetic holder. This viewing window is designed so that the engagement protrusion of the inner member of the support part fits into it, and in order to position and assemble the inner member to the magnetic holder, the fitting groove provided on the magnetic holder is simply inserted into the motor part side. By making it longer, the fitting groove is effectively utilized. Therefore, there is no need to separately form a dedicated viewing window in each magnetic holder.

Furthermore, the engaging protrusion that fits into the fitting groove to position and assemble the inner member to the magnetic holder is also used as a bullet holder for the brush biasing bullet, so that the parts Not only can this greatly contribute to multi-purpose use, but it can also greatly simplify the structure. Furthermore, in this case, the brush holder is disposed on the inner diameter side of the engagement protrusion, and is located at a position where it can always be seen from the viewing window formed in the engagement groove into which the engagement protrusion fits. It is no longer necessary to assemble the viewing window while aligning it to the locking claw position each time, which greatly contributes to improving the workability of the assembly work.

In addition, since the chiyoke coil is interposed between the facing surfaces of both the inner and outer members of the support part, a wide internal space on the rotor chamber side can be secured, and when removing the pigtail from the locking pawl, the tool can be used to remove the chiyoke coil. It also has the advantage of avoiding the problem of scratches and damage. Furthermore, when assembling the bearing part, the protrusion into which the lead wire is inserted is also used as the assembly member for both the inner and outer parts. Since it can be assembled, there is no need to take the trouble of passing the lead wires through each time to the motor section side, which also improves the workability of the assembly work.

[Brief explanation of the drawing]

The drawings show an embodiment of the motor-type fuel pump according to the present invention, in which Fig. 1 is a longitudinal sectional view of the motor-type fuel pump, Fig. 2 is a perspective view of the main parts, and Fig. 3 is a magnification. FIG. 4 is a front view of the net holder, FIG. 4 is a front view of the support, and FIG. 5 is an exploded view of the support. In the figure, 1 is a motor fuel pump, 2 is a motor case, 3 is a pump part, 4 is a motor, 5 is a rotor,
6 is a central shaft, 7 is a magnet holder, 8 is a magnet, 9 is a brush holder, 10 is a support portion, 12 is an outer member, 13 is an inner member, 13a is a positioning hole, 14 is an electrode plate, 14a is a lead wire, 15 is a protrusion, 16 is a brush, 17 is an engaging protrusion, 18 is a bullet,
19 is a pigtail, 21 is a locking claw, 22 is a fitting groove, 23 is a viewing window, 24 is a chiyoke coil, 26
is a commutator.

Claims (1)

[Scope of utility model registration request] A cylindrical casing is provided with a pump section on one side in the direction of the rotational axis of the rotor and a support section on the other side with the motor section in between, and the fuel flowing into the casing from the pump section on one side is The motor-type fuel pump is configured to discharge fuel from the support part side via the motor part, with both ends of a central shaft being fixedly supported between the pump part and the support part, and the central shaft being The rotor is rotatably supported on a shaft, and the supporting part has an engaging protrusion that serves as a bullet holder for a brush biasing bullet, and a brush holder arranged on the inner diameter side of the engaging protrusion, which is integrated with the brush holder toward the motor part. The inner member, which is formed to protrude from the outside, and the outer member, on which the electrode plate is implanted, are integrally positioned and formed by passing a protrusion formed on the outer member into a positioning hole drilled in the inner member. The lead wire passing through the protrusion of the outer member and the pigtail drawn out from the brush so as to protrude from the brush holder toward the motor section are connected to the inner side of the yoke coil interposed between the facing surfaces of both the inner and outer members. It penetrates through the member and connects to each coil end pulled out to the motor side to connect the two, and the brush holder can hold the brush in a position where it does not come into sliding contact with the commutator by locking the pigtail. A magnet holder is provided with a locking pawl and is interposed between the inner member and the pump section to hold a magnet disposed on the outer diameter side of the rotor. A fitting groove into which the engaging protrusion is fitted and for assembling the inner member in a positioned state on the magnetic holder is further opened in the fitted state of the engaging protrusion and from there is engaged with the locking pawl. A motor-type fuel pump characterized in that it has a large opening toward the motor section side to serve as a viewing window through which the pigtail can be removed.