JPH0326788Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention incorporates a motor and a pump that supply power to the armature via brushes and a commutator, and that the motor is installed in a motor vehicle within the housing of the motor. This relates to an electric pump through which non-conductive fuel is supplied to a commercial engine or the like.

(Prior Art) Conventionally, as shown in FIGS. 7 to 11, a field core of an electric pump 1, in this case a permanent magnet 2, is attached to a housing 3 which also serves as a yoke. 5 is rotatably attached to the housing 3 which also serves as a yoke.
A cover body 8 is attached to one end of the housing 3 by caulking the end face of the housing 3 with a synthetic resin attachment plate 7 for attaching the brush 6 in between, and a pump casing 9 is formed at the other end of the housing 3 which also serves as a yoke. One casing pullet 10 and spacer 1
1 and the other casing plate/cover body 12 is attached by caulking the end face of the housing 3, and in the pump chamber 13 formed by the pump casing 9, a rotor 15 with blade grooves 14 formed on the outer periphery is installed. The rotor 15 is rotatably supported by a bearing 16 and connected to the armature 5, and the rotor 15 is rotationally driven through the armature 5, so that the inside of the housing 3 is sucked in through the suction port 17 formed in the cover body 12. The fuel is discharged to the outside from a discharge port 18 formed in the cover body 8, and a brush holder 19 having a U-shaped cross section is mounted on the mounting plate 7, and a claw 20 formed in the brush holder 19 is bent through the brush holder 19. Therefore, the brush 6 that is attached to the mounting plate 7 and supplies power to the armature 5 via the terminal 21 attached to the cover body 8 and the ground of the housing 3 is attached to the brush holder 19 by the biasing force of the spring 22. It is attached to the commutator 23 so as to be in pressure contact and movable in the pressure contact direction.

(Problem to be solved by the invention) In the electric pump 1 configured in this way,
When power is supplied to the armature 5 through the brush 6, the rotor 15 rotates together with the armature 5, and fuel is pumped from the intake port 17 at one end of the housing 3 to the discharge port 18 at the other end.

In this case, since the housing 3 is always filled with fuel regardless of whether the electric pump 1 is operating or not, the mounting plate 7 will swell over a long period of time, as shown in FIGS. 10 and 11. , mounting plate 7
bulges inside the brush holder 19, making it difficult for the brush 6 to slide, resulting in poor rectification, sparks, and
An abnormality occurs in the order of blackening on the surface of the commutator 23, resulting in poor energization, that is, poor sliding of the brush 6, and poor contact between the brush 6 and the commutator 23, which causes the electric pump 1 to stop. There were flaws.

As a countermeasure against this, if the dimension in the direction perpendicular to the surface of the mounting plate 7 in the brush holder 19 (the vertical dimension in FIGS. 10 and 11) is made larger than the dimension of the brush 6 by a margin, the mounting plate 7 will swell. Although the brush 6 does not become slippery, it has the drawback that the play increases and the brush 6 tends to move, resulting in the generation of sparks and accelerated wear and tear on the brush 6.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric pump having a brush holder in which the dimensions inside the brush holder do not change even if the mounting plate of the brush holder swells.

(Means for Solving the Problems) That is, the present invention includes a yoke-cum-housing 37 having a permanent magnet 36 on the inner periphery, an armature 39 fixed to a rotating shaft 62 and integrating a commutator 59, and the armature 39. A pump 61 driven by rotation and a discharge port 52
and a mounting plate 41 made of insulating material.
and a brush holder 55.
The yoke housing 37 has a pump 61 attached to one end and a cover body 42 attached to the other end, has an armature 39 rotatably supported inside by a bearing 38, and has a pump 61 driven by a rotating shaft 62. constitutes an electric pump 60 that serves as a non-conductive liquid supply path through which external non-conductive liquid is sucked and discharged to the outside from the discharge port 52 of the cover body 42, and the commutator 59 is connected to the cover body 42 side. The mounting plate 41 made of insulating material is placed on the cover body 4.
The brush holder 55 is fixed to the inside of the claw 5.
6 and a backing plate 54, the metal frame 53 is fixed to the insulating mounting plate 41 by penetrating and bending the claws 56 through the backing plate 54. The brush holder 55 is connected to the armature 39 via a terminal 57 attached to the cover body 42 and the ground of the housing 37. Brush 4 that supplies
0 is attached to the electric pump which is in pressure contact with the commutator 59 by the biasing force of the spring 58 and is attached in the direction of movement in the pressure contact direction.

(Function) In the case of an electric pump having a brush holder configured as described above, even if the mounting plate 41 swells, the surface of the mounting plate 41 facing the metal frame 53 is made of a non-swelling material such as ceramic that is difficult to deform. Since it is in contact with the wooden backing plate 54, it cannot swell even if it swells, and the opposite surface of the mounting plate 41 that does not face the metal frame 53 swells.

(Effect of the invention) As a result, even if the insulating mounting plate 41 to which the metal frame 53 of the brush holder 55 is attached swells, the present invention maintains the sliding of the brush 40 in the same good condition as before swelling. There is an effect that can be done.

(Example) Next, the configuration of an example of the present invention is shown in Figures 1 to 6.
This will be explained using figures.

A housing 3 that also serves as a yoke to which a field core, in this case a permanent magnet 36, is attached.
7, an armature 39 that integrates a commutator 59 fixed to a rotating shaft 62 is connected to a bearing 38.
A cover body 42 is attached to one end of the housing 37 which also serves as a yoke, with a synthetic resin mounting plate 41 for attaching the brush 40 interposed therebetween, by caulking the end face of the housing 37, and which also serves as a yoke. At the other end of the housing 37,
One casing plate 44 forming the pump casing 43 and a spacer 45 are interposed therebetween, and the other casing plate/cover body 46 is attached by caulking the end face of the housing 37.

Pump chamber 4 formed by pump casing 43
7 includes a rotor 4 having blade grooves 48 formed on its outer periphery.
9 is rotatably supported by a bearing 50 and connected to the armature 39, thereby forming a pump 61 that is driven by the rotation of the armature 39.
By rotationally driving the fuel in the housing 37, fuel in the housing 37 is sucked in through an inlet 51 formed in the cover body 46 and discharged to the outside through an outlet 52 formed in the cover body 42.

Further, a metal frame 53 having a U-shaped cross section and a backing plate 5
4. In this case, the brush holder 55 is made of a contact plate 54 made of a material that does not swell with non-conductive liquid and is difficult to deform, such as ceramic, with the contact plate 54 sandwiched between the metal frame 53 and the mounting plate 41; Claw 5 integrally formed on frame body 53
6 is fixed to the mounting plate 41 by bending it through the mounting plate 41.

In the brush holder 55, a brush 40 that supplies power to the armature 39 via a terminal 57 attached to the cover body 42 and the ground of the housing 37 is in pressure contact with the commutator 59 and in the pressure contact direction by the biasing force of a spring 58. movably mounted.

Next, the operation of this embodiment will be explained.

In the case of the electric pump 60 having the brush holder configured in this way, even if the mounting plate 41 swells,
The surface of the mounting plate 41 that faces the metal frame 53 cannot swell because it is in contact with a backing plate 54 made of a non-swellable, hard-to-deform material such as ceramic. As a result, even if the insulating mounting plate 41 to which the metal frame 53 of the brush holder 55 is attached swells, the sliding of the brush 40 remains as good as before swelling. can be maintained in a stable condition.

[Brief explanation of the drawing]

Figure 1 is a cutaway side view of one embodiment of the present invention;
The figure is an explanatory view of the main part, Fig. 3 is a front view of the backing plate 54, Fig. 4 is a detailed view of the main part, Fig. 5 is a partially broken bottom view of Fig. 4, and Fig. 6 is a brush holder. 55 is an explanatory diagram showing another installation state, FIG. 7 is a broken side view of the conventional embodiment, FIG. 8 is an explanatory diagram of the main part thereof,
FIGS. 9 to 11 are detailed views of the main parts thereof. 36: Permanent magnet, 37: Housing, 38: Bearing, 39: Armature, 40:
Brush, 41: Mounting plate, 42: Cover body, 52:
Discharge port, 53: frame, 54: contact plate, 55: brush holder, 56: claw, 57: terminal, 58: spring, 59: commutator, 60: electric pump, 61: pump, 62: rotating shaft.

Claims (1)

[Scope of utility model registration request] A yoke-cum-housing 37 having a permanent magnet 36 on the inner periphery, an armature 39 that integrates a commutator 59 fixed to a rotating shaft 62, a pump 61 driven by the rotation of the armature 39, and a discharge port 52. The electric pump 60 has a cover body 42 having a structure, an insulating material mounting plate 41, and a brush holder 55, and the yoke-cum-housing 37 has the pump 61 attached to one end and the cover body 42 attached to the other end. An armature 39 is rotatably supported inside by a bearing 38, and a pump 61 driven by a rotating shaft 62 sucks the non-conductive liquid from outside to the discharge port 5 of the cover body 42.
The commutator 59 is disposed on the cover body 42 side, and the insulating material mounting plate 41 is disposed on the inside of the cover body 42. The brush holder 55 is fixed to the metal frame 53 and has a metal frame 53 having a claw 56 and a contact plate 54.
is fixed to the insulating material mounting plate 41 by penetrating and bending the claw 56 through the contact plate 54,
The contact plate 54 is made of a non-swelling and deformable material such as ceramic against non-conductive liquid, and the brush holder 55 has
The armature 3 is connected to the terminal 57 attached to the cover body 42 and the ground of the housing 37.
The brush 40 that supplies power to the spring 5
The electric pump is attached to the commutator 59 so that it can be pressed against the commutator 59 and can be moved in the pressing direction.