JP3324742B2 - Brush holder device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of a rotating electric machine having a brush.

[0002]

2. Description of the Related Art JP-A-56-86851 discloses a brush holder in which a pigtail terminal of a pigtail (brush lead wire) from a ground brush is screwed to an end plate with a screw passing through a brush holder plate. An apparatus is disclosed. Since the brush holder plate is insulative, conduction between the end plate which is in conduction with the motor frame and the pigtail terminal, that is, the ground of the brush is taken through the screw.

[0003]

In the brush holder device disclosed in the above publication, the brush is grounded via a screw, so that it cannot withstand a large current. That is,
There is no problem if the rotating electric machine is operated with a relatively small current. However, if the current flowing from the brush of the rotating electric machine to the ground is a large current exceeding, for example, 100 A for ordinary use, the pigtail terminal is fixed. The screws are overheating.
As a result, inconveniences such as loosening of the screw due to thermal expansion and overheating and burning of the periphery of the screw, resulting in unstable connection from the brush on the ground side to the ground.

[0004] Therefore, the present invention is to solve the problem to provide a brush holder device in which stable conduction can be obtained at the connection portion from the brush on the earth side to the end frame even in a rotating electric machine in which a large current flows through the brush. I do.

[0005]

Means for Solving the Problems and Their Functions / Effects To solve the above problems, the inventor has invented the following means. (First Means) A first means of the present invention is the brush holder device according to the first aspect. In this means, a notch is formed in the brush holder plate near the brush holder portion. The brush holder device of the present means has a metal brush terminal fitted in the notch, one of which has a predetermined area and is held between the brush holder plate and the end frame. The other of the brush terminals protrudes from the brush holder plate close to the brush holder portion. The brush terminal is electrically connected to the end frame on the one hand, and is connected to the ground brush on the other hand.

That is, a brush terminal in which the other end is connected to the ground side brush with a pigtail or the like is as follows:
On the other hand, it has a predetermined area and is in contact with the end frame, which is a ground member, with a pressing force. Therefore, the brush terminal is in contact with the end frame with a predetermined contact area, and the contact portion has low contact resistance, so that conduction between the brush terminal and the end frame is good. As a result, even when the rotating electric machine is operated with a large current, heat generation at the contact portion between the brush terminal and the end frame is small, and overheating is suppressed, so that the brush terminal is stable between the brush terminal and the end frame. Conduction is obtained.

Therefore, according to this means, even in a rotating electric machine in which a large current flows through the brush, a brush that can stably provide good conduction at the connection from the ground brush to the end frame via the brush terminal. There is an effect that a holder device can be provided. (Second Means) A second means of the present invention is a brush holder device according to claim 2.

According to the present invention, the brush terminal and / or the brush holder plate have a falling-off preventing means in which both are engaged with each other. Therefore, in the process of assembling the brush holder device of the present means, the brush terminal once fitted into the cutout of the brush holder plate does not fall off carelessly, so that the assembling work becomes easier.

Therefore, according to this means, in addition to the effect of the first means, there is an effect that the assembling work for assembling the brush terminal and the like to the brush holder plate becomes easier. (Third Means) A third means of the present invention is the brush holder device according to the third aspect.

According to this means, for example, when the brush holder plate is divided into two parts, the divided brush holders can be integrally held by the brush terminal, so that the assembly of the brush holder is further facilitated. This has the effect.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the brush holder device of the present invention will be clearly and fully described in the following embodiments so that those skilled in the art can understand the present invention. Embodiment 1 (Structure of Embodiment 1) A brush holder device according to Embodiment 1 of the present invention is a part of a four-pole DC motor, and FIG.
As shown in (a) to (c), it has a brush holder plate 1 + 2 and a brush terminal 3. The brush holder plate 1 + 2 is fixed to a motor frame (not shown) of the rotating electric machine by an end frame 4. The brush holder plate 1 + 2 is made of a member divided into two, a cover member 1 and a base member 2 formed of phenol resin. This is because the connection member 23 for the positive electrode enters the base member 2 due to manufacturing reasons.
This is because it is composed of

As shown in FIG. 2, the cover member 1 of the brush holder plate 1 + 2 has four brush holder portions 11 and 11 'for slidably storing the brush B of the rotating electric machine.
And a connecting portion 13 for connecting the brush holder portions 11 and 11 ′ at intervals of 90 ° in the circumferential direction. In the brush holder portions 11 and 11 ', a slit 110 is opened in a part of the wall of the concave portion in which the block-shaped brushes B and B' (see FIG. 1) enter. The pigtail (brush lead wire) 6 integrally connected to the brush B from the slit 110
Are led out of the brush holder portions 11 and 11 '. Further, the slits 11 of the brush holder portions 11 and 11 '
0, pigtail 6 is a commutator (commutator,
(Not shown) is formed on one side of the slit 110 to be locked so as not to come into contact with the slit 110.

[0013] The connecting portion 13 includes the brush holder portions 11 and 1.
1 ′ is a substantially ring-shaped structural member, and a slit-shaped notch 14 is formed from the outer peripheral portion of the connecting portion 13 at two locations facing each other. Notch 1
4 is formed at the circumferential end of the connecting portion 13 adjacent to the side wall of the pair of ground-side brush holder portions 11 facing each other, and the projection 111 is located between the notch 14 and the slit 110. ing. In addition, screw holes 12 are formed at two locations of the connecting portion 13 facing each other.

As shown in FIG. 3, a pair of notches 24 are formed in the base member 2 of the brush holder plate 1 + 2 at positions corresponding to the notches 14 of the cover member 1 described above. Further, a pair of screw holes 22 are formed at positions corresponding to the screw holes 12 of the cover member 1 described above. The main part of the connection member 23 for the positive electrode is held inside the base member 2. The distal end portion 231 of the connection fitting 23 protrudes at two places facing each other, and as shown in FIG. 1A again, near the side along the side wall of the brush holder 11 ′ for the positive electrode brush of the cover member 1. It is arranged and connected to the positive electrode brush B 'by a pigtail (not shown). On the other hand, the base end portion 232 of the connection fitting 23 projects in the centrifugal direction from the inner peripheral portion of the base member 2 and is connected to a positive electrode (not shown) of the power supply.

The brush terminal 3 is shown in FIGS.
As shown in (b), the connection member is made of an L-shaped metal, and has a screw hole 32 formed in one ground portion 31 and an end portion of the pigtail 6 in the other connection portion 33. Are welded. The end frame 4 is also a ground member for fixing the brush holder plate 1 + 2 to a motor frame (not shown) of the rotating electric machine, as shown in FIG. 1B again. The brush holder plate 1 + 2 and the brush terminal 3 are screwed to the end frame 4 with screws 5 passing through the screw holes 12 of the cover member 1, the screw holes 22 of the base member 2, and the screw holes 32 of the brush terminal 3. Fixed.

Here, the brush terminal 3 is fitted and locked in the notches 14 and 24 of the brush holder plate 1 + 2. The ground portion 31, which is one of the brush terminals 3, is sandwiched between the brush holder plate 1 + 2 and the end frame 4 by the entire ground portion 31, and is electrically connected to the end frame 4 with the entire area of one surface of the ground portion 31. Connection part 33 which is the other of brush terminals 3
Protrudes from the brush holder plate 1 + 2 along the side wall of the brush holder 11 for the ground side brush B, and is connected to the brush B by a pigtail 6.

The brush B and the brush terminal 3 connected to each other by the pigtail 6 are engaged with the protrusion 111 of the brush holder 11 when the brush holder device of this embodiment is assembled. Therefore, falling off from the brush holder plate 1 + 2 is prevented. (Effects of the First Embodiment) The brush holder device of the present embodiment is constructed as described above, and exhibits the following effects.

In the brush holder device of the present embodiment, notches 14 and 24 are formed in the brush holder plate 1 + 2 near the brush holder portion 11. The brush holder device of this embodiment has a metal brush terminal 3 fitted into the notches 14 and 24 and held between the brush holder plate 1 + 2 and the end frame 4 by the grounding portion 31. Connection part 33 of the brush terminal
Protrudes from the brush holder plate 1 + 2 in the vicinity of the brush holder 11. Brush terminal 3
Is connected to the end frame 4 at the connection portion 33, and is connected to the ground side brush B on the other side.

That is, the brush terminal 3 in which the connecting portion 33 is connected to the ground brush B by the pigtail 6.
Are in contact with the end frame 4 which is also a ground member with a predetermined area in the ground portion 31 with a pressing force.
Therefore, the brush terminal 3 is in contact with the end frame 4 with one entire surface of the ground portion 31 as a contact surface, and the contact area is large and the contact resistance is small, so that conduction between the brush terminal 3 and the end frame 4 is good. . As a result, even when the rotating electric machine is operated with a large current, heat generation in the brush terminal 3 is small and overheating is prevented, so that stable conduction between the brush terminal 3 and the end frame 4 can be obtained. .

Therefore, according to the brush holder device of the present embodiment, even in a rotating electric machine in which a large current flows, the connecting portion 33 from the ground side brush B to the end frame 4 via the brush terminal 3 stably operates. And good conduction can be obtained. (Various Modifications of the First Embodiment) As a modification of the present embodiment, the brush terminal 3 and / or the brush holder plate 1 + 2 have a structure in which the brush holders 1 + 2 and 3 have a drop-off preventing means for engaging with each other. Is also possible.

As a first modification, as shown in FIG.
A protrusion 34 is provided on a part of the brush terminal 3, and the protrusion 34 is provided.
And the connecting portion 33 for lightly holding the brush holder plate 1 + 2. As Modification 2, FIG.
As shown in FIG. 3, the brush holder plate 1 + 2 is lightly held between the end face of the pigtail 6 welded to the connection part 33 of the brush terminal 3 and the connection part 33.
Alternatively, notch 1 of brush holder plate 1 + 2
Protrusions may be provided on a part of the brush terminals 3, 4, and the protrusions of the notches 14, 24 may lightly clamp a part of the connection portion 33 of the brush terminal 3.

In these variants, the brush terminal 3 and / or the brush holder plate 1 + 2 have means for preventing them from falling off, in which both 1 + 2 and 3 engage with each other. Therefore, in the process of assembling the brush holder device of these modified embodiments, the brush terminal 3 once fitted into the cutouts 14 and 24 of the brush holder plate 1 + 2 does not fall off carelessly, so that the assembling work is further improved. It will be easier.

Therefore, according to these modifications,
In addition to the effect of the first embodiment, there is an effect that the assembling work of assembling the brush terminal 3 to the brush holder plate 1 + 2 becomes easier.

[Brief description of the drawings]

FIG. 1 is an assembly diagram showing a configuration of a brush holder device as a first embodiment. (A) Front view (b) Partial sectional side view (c) Partial horizontal sectional view

FIG. 2 is a front view showing a cover member of the brush holder plate according to the first embodiment.

FIG. 3 is a front view showing a base member of the brush holder plate according to the first embodiment.

FIG. 4 is a set diagram showing the configuration and shape of the brush terminal according to the first embodiment. (A) Front view (b) Plan view

FIG. 5 is a partial side view showing a configuration of a drop-off preventing means according to a first modification of the first embodiment;

FIG. 6 is a partial side view showing a configuration of a drop-off preventing means according to a second modification of the first embodiment;

[Explanation of symbols]

10: Brush holder device 1 + 2: Brush holder plate 1: Cover member (made of phenol resin) 11, 11 ': Brush holder portion 110: Slit 111: Projection 13: Connection portion 12: Screw hole 14: Notch 2: Base member 21: Body part (made of phenolic resin) 22: Screw hole 24: Notch 23: Connection for positive electrode 231: Tip 232: Base end 3, 3 ': Brush terminal (metal L-shaped for ground side brush) 31: ground part (one side) 32: screw hole 33: connection part (other side) 34: protrusion 4: end frame (metal ground member) 5: screw 6: pigtail (brush lead wire) B: Brush block

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02K 13/00-13/14 H02K 5/00-5/26

Claims (3)

(57) [Claims] A brush holder having a plurality of brush holders for slidably accommodating brushes of the rotating electric machine, and a brush holder plate having connecting portions for connecting the brush holders at predetermined intervals in a circumferential direction. The rotary electric machine having a device and a metal end frame for fixing the brush holder device to a machine frame, wherein the brush holder plate has a notch formed close to the brush holder portion. One end is fitted between the brush holder plate and the end frame with a predetermined area, and the other protrudes from the brush holder plate in proximity to the brush holder portion; A brush holder having a metal brush terminal connected to the end frame on one hand and connected to the brush on the other hand. Location. 2. The brush holder device according to claim 1, wherein said brush terminal and / or said brush holder plate have a falling-off preventing means in which both are engaged with each other. 3. The brush holder device according to claim 1, wherein said brush holder plate is divided into a plurality of pieces.