JP2692125B2 - Rotating electric machine brush holder assembly structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a brush holder assembling structure for a rotating electric machine such as an electric motor or a generator, and particularly to a brush holder assembling structure for a vehicle starter. It is suitable.

[Prior Art] Conventionally, in a rotating electric machine such as an electric motor or a generator, when the brush holder is assembled, the brush holder may be fixed using a holder plate attached to a bracket. In this case, the brush holder is assembled by screwing the brush holder to the holder plate or caulking and fixing with a rivet.

However, regarding the assembling of the brush holder, there is a demand for reduction of the number of parts and simplification of the assembling process, and Japanese Patent Laid-Open No. 129555/1984 discloses the demand to meet the demand.

In this publication, as shown in FIG.
Two or more claws on the holder plate 101 for fixing 0
The hole 102 is formed by pressing and the insertion hole 103 for inserting the claw 102 of the holder plate 101 into the brush holder 100.
Is provided.

When assembling the brush holder 100 and the holder plate 101, for example, when the holder plate 101 has two claws 102, the insertion holes 103 of the brush holder 100 are fitted into the claws 102 of the holder plate 101. Then, the brush holder 100 is assembled by twisting the one claw 102 and bending the other claw 102.

As a result, it is not necessary to use rivets or screws when assembling the brush holder 100, and the assembling process of the brush holder 100 can be simplified.

[Problems to be Solved by the Invention] However, in the above-described conventional technique, the holder plate 10
There is no change in the structure of assembling the brush holder 100 by using 1, and instead of fixing the brush holder 100 with rivets or screws, the claws 102 are used for fixing, which simplifies the process of assembling the brush holder 100. It is not possible to obtain a great effect on the conversion.

Therefore, there is a demand for a brush holder assembly structure that does not use a holder plate and that does not require caulking and fixing with rivets or screwing.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a rotating electric machine that reduces the number of parts and simplifies the brush holder assembly process with a structure that does not use a holder plate. .

[Means for Solving the Problems] In order to achieve the above object, the present invention employs the following technical means.

A rotor provided with a contact such as a commutator or a slip ring, a conductive bracket that rotatably supports the rotor, and an insulating member that is fixed to the bracket and is electrically connected to an external power source. An external power supply connection terminal, a grounding terminal fixed to the bracket and grounded via the bracket, and a positive terminal which is provided so as to be in sliding contact with the contact and electrically connected to the external power supply connection terminal. A side brush, a minus side brush that is provided so as to be in sliding contact with the contact and is electrically connected to the ground terminal, and holds the plus side brush and locks with the external power supply connection terminal. A plus side brush holder provided with a first engaging means and a second engaging means for holding the minus side brush and engaging with the ground terminal are provided. A minus side brush holder, and the first side locking means is locked to the external power source connection terminal to be insulated from the bracket to fix the plus side brush holder to the bracket. The negative side brush holder is fixed to the bracket by locking the stop means to the ground terminal.

[Operation and Effect of the Invention] With the present invention having the above-described configuration, the external power source connection terminal electrically connected to the external power source and the first locking means provided on the plus side brush holder are locked, and The side brush holder is fixed to the bracket.

Further, the negative side brush holder is fixed to the bracket by locking the ground terminal grounded via the bracket and the second locking means provided on the negative side brush holder.

Therefore, in the present invention, since the plus side brush holder and the minus side brush holder are structured to be fixed to the bracket by using the external power supply connection terminal and the ground terminal,
Since it is not necessary to use a holder plate as in the past and it is not necessary to fix it with screws or rivets, the number of parts is reduced and the assembly process of the plus side brush holder and the minus side brush holder is simplified. You can

[Embodiment] Next, as an example of the brush holder assembling structure of the rotating electric machine of the present invention, a brush holder assembling structure of a vehicle starter will be described based on an embodiment shown in the drawings.

FIG. 1 is a cross-sectional view showing a brush holder assembling structure of a vehicle starter, FIG. 2 is a view as seen from A of FIG. 1, and FIG. 4 is a schematic view of a vehicle starter.

As shown in FIG. 4, a vehicle starter 1 which is a rotating electric machine of the present invention uses a vehicle-mounted battery 2 as a power source and operates a magnet switch 3 having a well-known structure so that a pinion 4 and a ring gear 5 are engaged with each other. , The rotating force is generated in the armature 6 (see FIG. 1), which is a rotor, to start the engine.

As shown in FIG. 1, the motor portion of the starter 1 according to the present invention includes an armature 6 having a commutator 7, a cylindrical yoke 8 made of a ferromagnetic material, and a permanent magnet such as a ferrite magnet attached to an inner peripheral wall of the yoke 8. It is composed of a pole core 9 which is a magnet, a plus side brush 10 and a minus side brush 11 which are provided by being pressed against the outer peripheral surface of the commutator 7.

The armature 6 is rotatably provided integrally with a rotary shaft 7a whose both ends are supported by bearings 12, and one end of the rotary shaft 7a (end on the commutator 7 side) of one of the cylindrical yokes 8 is provided. It is supported via the bearing 12 by an aluminum bracket 13 fitted to the end face (the left end face in FIG. 1).

A seal member 14 is provided outside the bearing 12 (on the left side in FIG. 1) to prevent engine lubricating oil and the like from flowing into the starter 1.

The electrically conductive bracket 13 is press-fitted and fixed with a resin bushing 16 that is an insulating member of the present invention in which the external power supply connection terminal 15 is insert-molded, and faces the external power supply connection terminal 15 about the rotating shaft 7a. The ground terminal 17 is press-fitted and fixed in the position.

The external power supply connection terminal 15 is formed by forming an elongated metal plate into a U-shape and is insulated from the bracket 13 by the bushing 16. The one end 15a taken out of the bracket 13 is connected to the external power supply via the magnet switch 3. While being connected to the plus side of a certain vehicle-mounted battery 2, the other end 15b pulled out inside the bracket 13 is electrically connected to the plus side brush 10 via the pigtail 18.

The grounding terminal 17 is grounded through the bracket 13 by press-fitting and fixing one end 17a side of a rectangular metal plate in the bracket 13, and the other end 17b is electrically connected to the minus side brush 11 through the pigtail 19. To be done.

The plus-side brush 10 and the minus-side brush 11 (hereinafter referred to as brushes 10 and 11) are held by the plus-side brush holder 20 and the minus-side brush holder 21 (hereinafter referred to as brush holders 20 and 21), and the brush springs are respectively provided. It is pressed against the outer peripheral surface of the commutator 7 by 22, 23,
As the commutator 7 rotates, it is electrically connected to the commutator 7 while slidingly contacting the outer peripheral surface of the commutator 7.

The brush holders 20, 21 are assembled with one side surface 20a, 21a thereof in contact with the inner wall surface 13a of the bracket 13, but the brackets are obtained by molding thermosetting resin.
It is electrically insulated against 13.

Further, the brush holders 20 and 21 are, as shown in FIG.
A rectangular parallelepiped box portion 24, 25 for accommodating the brushes 10, 11 and the brush springs 22, 23 is formed, and is adjacent to the box portions 24, 25 in the circumferential direction of the rotating shaft 7a. Slit-shaped through holes 26 and 27, which are the stopping means and the second locking means, are formed in the axial direction. The through holes 26, 27 are formed such that their cross-sectional shapes are such that the external power supply connection terminal 15 and the ground terminal 17 can be reasonably inserted. The third
The figure shows a perspective view of the brush holders 20, 21.

The boxes 24 and 25 hold the brushes 10 and 11 and store the brushes 10 and 11 and the brush springs 22 and 23,
The commutator 7 side is opened, and cut grooves 28 and 29 for passing the pigtails 18 and 19 are formed on the side surface on the pole core 9 side. Further, in order to prevent contact of the pigtails 18 and 19 with the inner peripheral surface of the yoke 8 or the pole core 9 from the side surfaces where the cut grooves 28 and 29 are formed, arcuate side walls 30 and 31 along the inner peripheral surface of the yoke 8 are provided. Are extended in the axial direction.

Next, the assembling and fixing of the brush holders 20 and 21 of this embodiment will be described.

Brackets 13 made by casting aluminum
In addition, the bushing 16 in which the external power supply connection terminal 15 is insert-molded is press-fitted and fixed, and the one end 17a side of the ground terminal 17 is press-fitted and fixed.

Then, the external power supply connection terminal 15 fixed to the bracket 13
And the ground terminal 17, through the through holes 26 of the brush holder 20, 21,
Insert 27.

One side 20a, 21a of the brush holder 20, 21 is on the bracket 13
At the position where it abuts the inner wall surface 13a, the other ends 15b and 17b of the external power supply connection terminal 15 and the ground terminal 17 protruding from the through holes 26 and 27 of the brush holders 20 and 21 are twisted and deformed by 90 degrees. As a result, as shown in FIGS. 1 and 2, the brush holders 20 and 21 are fixed to the bracket 13, and the brush holder 2
The movement of 0, 21 in the circumferential direction, the axial direction, and the radial direction is restricted.

After that, the brush springs 22, 23 and the brushes 10, 11 are stored in the boxes 24, 25 of the brush holders 20, 21, and the boxes 24,
Take out the pigtails 18 and 19 simultaneously molded on the brushes 10 and 11 from the cut grooves 28 and 29 of 25, and weld the ends of the pigtails 18 and 19 to the other ends 15b and 17b of the external power supply connection terminal 15 and the ground terminal 17. And connect.

Finally, the seal member 14 is assembled, and the armature 6 is attached via the bearing 12 to complete the process.

As described above, in this embodiment, the brush holders 20 and 21 can be assembled only by fitting the through holes 26 and 27 formed in the brush holders 20 and 21 into the external power supply connection terminal 15 and the ground terminal 17. Therefore, the brush holders 20 and 21 can be easily assembled as compared with the related art. Also, brush holder 2
When fixing 0 and 21 to bracket 13, brush holder 2
After fitting the through-holes 26 and 27 of 0 and 21 into the external power supply connection terminal 15 and the ground terminal 17, it is sufficient to deform the other ends 15b and 17b of the external power supply connection terminal 15 and the ground terminal 17, respectively. In addition, there is no need for a holder plate, and there is no need for fixing screws or rivets.

As a result, the number of parts can be reduced as compared with the conventional technique, and the assembly process of the brush holders 20 and 21 can be simplified.

 A second embodiment of the present invention is shown in FIGS.

Since FIGS. 5 to 7 show the plus side brush holder 20 that engages with the external power supply connection terminal 15, the parts and parts having the same action on the minus side are indicated in parentheses on the minus side number. Attach.

In this embodiment, the external power supply connection terminal 15 and the ground terminal 17
As shown in FIGS. 5 to 7, the other ends 15b, 1
The cut grooves 32 and 33 for connecting the pigtails 18 and 19 are provided on the 7b, and the width W of the other ends 15b and 17b provided with the cut grooves 32 and 33 is
It is formed to be larger than the width w of the through holes 26, 27 of the brush holders 20, 21.

Further, on the side surface of the commutator 7 side forming the through holes 26, 27, as shown in FIG. 7, opening grooves 34, 35 for opening the through holes 26, 27 over the entire length of the through holes 26, 27. Are formed.

When assembling the brush holders 20 and 21, insert the pigtail 1 into the cutout grooves 32 and 33 of the external power connection terminal 15 and the ground terminal 17.
After inserting the ends of 8 and 19, the through holes 26 and 27 of the brush holders 20 and 21 are fitted from the other ends 15b and 17b of the external power supply connection terminal 15 and the ground terminal 17, respectively. At this time, the other end 15 provided with the cut grooves 32 and 33 of the external power supply connection terminal 15 and the ground terminal 17
Since the width W of b, 17b is formed larger than the width w of the through holes 26, 27, the other ends 15b, 17b of the external power supply connection terminal 15 and the ground terminal 17 are connected to the through holes 26 of the brush holders 20, 21, respectively. It will be pressed into 27.

As a result, as shown in FIG.
15 and the other end 15b of the ground terminal 17, cut groove 32 provided in 17b,
Pigtail that is fitted with 33 and is inserted into the notch 32, 33
The ends of 18 and 19 are pressed into contact with each other to electrically connect the external power supply connection terminal 15 and the ground terminal 17 to the pigtails 18 and 19.

When the through holes 26, 27 of the brush holders 20, 21 are fitted from the other ends 15b, 17b of the external power supply connection terminal 15 and the ground terminal 17, the pigtails 18, 19 pass through the opening grooves 34, 35.

In this way, in this embodiment, the brush holders 20 and 21 are fixed and the brush holders 20 and 21 are fixed together with the external power supply connection terminal 15 by using the structure in which the external power supply connection terminal 15 and the ground terminal 17 are assembled by press fitting. And ground terminal 17 and pigtail
The connection with 18 and 19 can be made at the same time.

 A third embodiment of the present invention is shown in FIGS.

FIG. 8 is an explanatory view of the assembly of the brush holder, FIG. 9 is a B view of FIG. 8, FIG. 10 is a sectional view taken along the line CC of FIG.
Figure 11 shows a perspective view of the brush holder.

9 and 11 are explanatory views of the plus side, parts and parts having the same action on the minus side are numbered on the minus side in parentheses.

In this embodiment, as shown in FIG. 10, the brush holder 2
The through holes 26, 27 of 0, 21 are provided with the convex portions 36, 37 for reducing the cross-sectional area of the through holes 26, 27, and the through holes 26, 27 are opened as in the second embodiment described above. Opening groove 34, 35
Is formed. The convex portions 36 and 37 are formed near the bracket 13 of the through holes 26 and 27.

Further, on one side surface 20a of the plus side brush holder 20, in order to avoid hitting the end portion 16a of the bushing 16 protruding from the inner wall surface 13a of the bracket 13, a wide concave portion 38 is formed continuously with the through hole 26. Has been done. Since the ground terminal 17 is directly press-fitted into the bracket 13 without using the bushing 16, it is not necessary to form the concave portion 38 in the minus side brush holder 21 to avoid the end portion 16a of the bushing 16.
In order to keep the cost of the brush holder 21 low, the positive brush holder 20 may have the same shape.

On the other hand, the other end 15 of the external power supply connection terminal 15 and the ground terminal 17
On the b and 17b sides, two notches are provided on each side of the commutator 7 side, and a cut and bend portion is provided between the two notches.
39 and 40, which are bent in a claw shape as shown in FIGS. 9 and 11.

As shown in FIGS. 8 to 10, the dimensions of the respective portions were such that the depth of the concave portion 38 was H1, the depth of the convex portions 36 and 37 was H2, and the convex portions 36 and 37 were formed. Width of through holes 26 and 27: w1, Width of through holes 26 and 27: w2, Width of opening grooves 34 and 35: w3, Thickness of end 16a of bushing 16: h1, Bracket 13 from inner wall surface 13a of bracket 13 The height to the notch is: h2 The thickness of the external power supply connection terminal 15 and the ground terminal 17: t1, and the thickness of the external power supply connection terminal 15 and the ground terminal 17 including the cut and bend portions 39 and 40: t2, H1> It is set so that h1, H2 ≦ h2, w1> t1, and t2> w3.

Next, assembly of the brush holders 20 and 21 of this embodiment will be described.

The bushing 16 in which the external power supply connection terminal 15 is insert-molded is press-fitted and fixed to the bracket 13, and the ground terminal 17
One end 17a side is press-fitted and fixed. Next, the ends of the pigtails 18 and 19 simultaneously formed on the brushes 10 and 11 are connected to the external power supply connection terminal 15 and the other ends 15b and 17b of the ground terminal 17 by welding.

After assembling the seal member 14, the armature 6 is mounted via the bearing 12.

Then brush springs 22, 23 and brushes 10, 11
As shown in FIG. 8, the brush holders 20 and 21 accommodating the above are assembled from the outer peripheral side of the commutator 7. At this time, the cut-and-bent portions 39 and 40 of the external power supply connection terminal 15 and the ground terminal 17 are elastically deformed when passing through the opening grooves 34 and 35 of the brush holders 20 and 21, and are fitted into the through holes 26 and 27. In that case, it returns to the original state. Therefore, as described above, since t2> w3 is set, the cut-and-bend portions 39 and 40 are not disengaged from the opening grooves 34 and 35, and therefore the radial movement of the brush holders 20 and 21 is restricted. .

Further, the protrusions 36, 37 and the cut-and-bend portions 39, 40 are locked, so that the movement of the brush holders 20, 21 in the axial direction is restricted.

As described above, in this embodiment, the brushes 10, 11 and the brush holders 20, 21 can be assembled after the commutator 7 is assembled. Therefore, the brush 10 is different from the first embodiment and the second embodiment described above. , 11 and the brush holders 20, 21 can be easily assembled.

(Modification) In the above-described embodiment, the case where the invention is applied to the brush holder assembling structure of the vehicle starter is shown as an example of the brush holder assembling structure of the rotating electric machine of the present invention. However, other electric motors or generators It may be applied to the brush holder assembly structure.

Further, although the plus side brush holder 20 and the minus side brush holder 21 are formed of a thermosetting resin that is electrically insulated from the bracket 13, the minus side brush holder 21
Regarding the above, it is not necessary to be insulated from the bracket 13, and it may be formed of a material having conductivity.

[Brief description of the drawings]

1 to 4 show a first embodiment of the present invention.
1 is a sectional view showing a brush holder assembly structure of a vehicle starter, FIG. 2 is a view of FIG. 1A, FIG. 3 is a perspective view of a brush holder, and FIG. 4 is a schematic view of a vehicle starter. 5 to 7 show a second embodiment of the present invention, FIG. 5 is an explanatory view showing the assembly process of the brush holder, FIG. 6 is an assembly state view of the brush holder, and FIG. 7 is a brush holder. Perspective view of
8 to 11 show a third embodiment of the present invention,
The figure shows the assembly of the brush holder, and Fig. 9 shows B in Fig. 8.
FIG. 10 is a sectional view taken along the line CC of FIG. 8, FIG. 11 is a perspective view of the brush holder, and FIG. 12 is a perspective view for explaining the assembly of the brush holder according to the prior art. In the figure, 1 ... vehicle starter (rotary electric machine), 2 ... vehicle battery (external power source), 6 ... armature (rotor),
7: commutator (contact), 10: plus brush, 11 ...
… Negative brush, 13 …… Bracket, 15 …… External power supply connection terminal, 16 …… Bushing (insulating member), 17 …… Grounding terminal, 20 …… Positive brush holder, 21 …… Minus brush holder, 26 ...... Through hole (first locking means), 27 ...
... Through hole (second locking means)

Claims (1)

(57) [Claims] 1. A rotor provided with a contact such as a commutator or a slip ring, (b) a conductive bracket for rotatably supporting the rotor, and (c) an insulating member interposed therebetween. An external power supply connection terminal fixed to the bracket and electrically connected to an external power supply; (d) a ground terminal fixed to the bracket and grounded via the bracket; and (e) to the contactor. A plus side brush provided in sliding contact and electrically connected to the external power supply connection terminal; and (f) a minus side provided in sliding contact with the contactor and electrically connected to the ground terminal. A brush, (g) a plus side brush holder that holds the plus side brush, and a first engaging means for engaging with the external power supply connection terminal, and (h) holds the minus side brush And a minus side brush holder provided with a second locking means for locking with the ground terminal, and (i) by locking the first locking means to the external power supply connection terminal, The minus side brush holder is fixed to the bracket by being insulated from the bracket and fixing the plus side brush holder to the bracket, and (j) the second engaging means to be engaged with the ground terminal. A structure for assembling a brush holder for a rotating electric machine, characterized by: