JP3413305B2 - Motor rotor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a motor, and more particularly to a rotor characterized by a connection structure between a riser and a coil formed in a commutator.

[0002]

2. Description of the Related Art A rotor of a DC motor is provided with a coil and a commutator around a rotary shaft. The commutator mounting structure and the mounting process are shown in FIG. Shown as a diagram. In the figure,
A resin base 102 is attached to the rotating shaft 100. The rotary shaft 100 is fitted in the center of the base 102, and a plurality of commutator pieces 104 can be attached to the outer peripheral surface of the base 102. A plurality of commutator pieces 104 are combined to form a commutator. The commutator piece 104
A cap 106 is fitted on the upper end of the to prevent the cap from falling off. Further, a riser 108 is formed on the commutator piece 104 by cutting and bending. The riser 108 is formed so as to have a shape similar to a J-shape together with the brush contact portion 110.

The nozzle 1 having the hook 112a
12, the coil 114 is wound around the riser 108, the pressure electrode 116 is further pressed against the riser 108 to apply pressure, and fusing (pressure resistance welding) is performed, and the riser 108 is caulked to the base 102 side to raise the riser 108. And the coil 114 are connected.

However, in the case of such a method,
Since the riser 108 only slightly projects from the base 102, the nozzle 112 causes the riser 108 to coil the coil 11.
There is a problem that the step of winding 4 is difficult to perform.

Also, when performing fusing, the riser 1
08 contacts the outer peripheral surface of the resin base 102,
The base 102 is melted and deformed by the pressure and heating of the fusing. As a result, the riser 108 provided on the commutator piece 104 cannot be properly crimped due to incomplete pressurization, and the crimping becomes loose, resulting in a poor connection between the riser 108 and the coil 114. Alternatively, the crimped riser 108 may be depressed due to the deformation of the base 102, and the coil 114 may be pulled and broken. Further, as the riser 108 is depressed, the brush contact portion 110 is also deformed, and the brush contact portion 1
There is also a problem of deterioration in accuracy such as poor contact between the brush 10 and the brush (not shown).

Therefore, in order to prevent the deformation of the base, Japanese Utility Model Laid-Open No. 63-15157 discloses a riser (second core portion 18) via a extending portion (first core portion 12) from a brush contact portion. ) Is provided, and the heat generated by the fusing is less likely to be transmitted to the base by the extended portion.

However, in this structure, the shape of the riser is
Since the shape is folded back from the extended portion toward the brush contact portion, there is a problem that the step of winding the coil around the riser is difficult to perform.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to prevent the deformation of the base due to the heat of resistance welding and to rotate the motor in which the coil is easily wound around the riser. To provide a child.

[0009]

In order to achieve the above object, the invention according to claim 1 has a base attached to a rotary shaft, a commutator piece attached to the base and on which a brush slides, In a rotor of a motor having a riser provided on the commutator piece for connecting with a coil, the riser has an extending portion extending in a direction away from a brush sliding surface of the commutator piece, The armature core is provided at the tip of the extending portion with an imaginary line extending in a direction perpendicular to the brush sliding surface interposed therebetween.
And a pair of rising pieces that are formed to rise toward the opposite side, and a hook around which the coil is wound is formed by the pair of rising pieces, and the resistance is welded by crimping the hooks. And the coil is connected to the riser.

[0010]

[0011] According to a second aspect of the invention, the rotor of the motor according to claim 1 Symbol placement, wherein the pair of rising piece, wherein the notch winding hooking the coil is formed.

According to a third aspect of the invention, in the motor rotor according to the second aspect, the cutout portion is a first cutout portion formed on the brush sliding surface side of one rising piece,
It is characterized by comprising a second notch portion formed on the opposite side of the first notch portion of the other rising piece.

[0013]

According to the first aspect of the invention, the coil can be connected to the riser by crimping the hook formed by the pair of rising pieces and performing pressure resistance welding. Further, since the hook is formed at a position separated from the base by the extended portion, heat due to resistance welding is less likely to be transmitted to the base, and deformation of the base due to heat can be prevented.

Further, the pair of rising pieces are formed so as to stand up at the tip of the extending portion with an imaginary line extending in a direction perpendicular to the brush sliding surface sandwiched therebetween. Therefore, this rising portion is raised in a direction parallel to the brush sliding surface or the base surface. Then, since the space between the rising portion and the brush sliding surface or the base surface is not narrowed, the step of winding the coil can be easily performed.

In this respect, the above-mentioned actual exploitation 63-15157.
In the technique described in the publication, the shape of the portion where pressure resistance welding is performed (corresponding to the rising portion of the invention of the present application) is a shape that is folded back in the direction of the base from the extended portion, so these intervals are narrow. It is difficult to perform the process of winding the coil.

Furthermore, in the times trochanter since armature core has become a prominent member of the rotation axis, it is preferable to avoid smaller spacing between the armature core rising piece Prefecture. Therefore, the rising piece and the armature core to form the opposite side, if not to reduce the width between the rising piece and the armature core can be easily performed step of winding the more coils .

If the notch is formed in the rising piece as in the second aspect of the invention, the coil can be wound more easily.

The notch is formed as in the invention of claim 3, and the coil is hooked on the first notch and the second notch so as to be oblique to the extending direction of the extending part. The easiest way to wrap it is to wrap it around.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are views showing a rotor according to an embodiment, where FIG. 1A is a plan view and FIG. 1B is a front view. And
FIG. 2 is an enlarged cross-sectional view of a part of the rotor shown in FIG.

In the figure, this rotor 10 is used for a small DC motor, and like the conventional one,
An armature core 14 is provided substantially in the center of the rotary shaft 12, and a coil 16 is wound around the armature core 14. Then, three commutator pieces 20 are provided on the resin base 18 to form a sliding surface 26 with a brush (not shown), and a cap 22 is attached to an end portion of the commutator piece 20 to remove the commutator piece 20. It is being prevented.

More specifically, as shown in FIG. 2, the commutator piece 20 is held by fitting one end into a groove 24 formed in the base 18 and attaching a cap 22 to the other end.

The greatest feature of this embodiment is that the riser 3 for electrically connecting the commutator piece 20 and the coil 16 is connected.
0. This riser 30 is formed integrally with the commutator piece 20, and it is preferable to cut and bend one conductive plate to integrally form both. The integrated commutator piece 20 and riser 30 are shown in FIG. In FIG. 3, (A) is a plan view, (B) is a front view,
(C) is a side view.

The riser 30 comprises an extension 32 and a hook 34.

The extending portion 32 extends in a direction away from the sliding surface 26 of the commutator piece 20 with the brush.
Its length does not exceed the size of the armature core 14, as shown in FIG. Thus, it does not come into contact with other members inside the motor.

The hook 34 is composed of a pair of rising pieces 34a and 34b that are formed to rise at the tip of the extending portion 32, and the coil 16 is placed between the rising pieces 34a and 34b and wound. The coil 16 is caulked in the sandwiching direction, and pressure resistance welding is performed for electrical connection.

More specifically, the rising pieces 34a and 34b are provided on both sides of a virtual line (shown by a chain line in FIG. 3A) extending in the extending direction of the extending portion 32. Then, the rising pieces 34a and 34b are provided so as to be inclined so as to form a V shape or a J shape when viewed from the end surface (see FIG. 3B). Further, the rising pieces 34a, 34b are provided toward the side opposite to the armature core 14 around which the coil 16 is wound, as shown in FIG.

Therefore, the space between the armature core 14 and the coil 16 wound around the armature core 14 and the hook 34 is not narrowed, so that the step of winding the coil 16 around the hook 34 can be easily performed.

Since the hook 34 is provided at the position away from the sliding surface 26 by providing the hook 34 at the tip of the extending portion 32, the step of winding the coil 16 around the hook 34 is also performed in this respect. Easy to do.

Further, the rising pieces 34a, 34b are formed with a first notch 36a and a second notch 36b.
The first cutout portion 36a is the commutator piece 2 in the rising piece 34a.
The second cutout portion 36b is formed near the extension portion 32 on the 0 side, and is formed near the extension portion 32 on the opposite side of the commutator piece 20 in the rising piece 34b. And the first missing part 36
As shown by the broken line in FIG. 3A, the a and the second cutout portion 36b are diagonally opposed to the extension portion 32 at an angle of about 45 degrees.

Next, when the coil 16 is wound around the hook 34 having such a shape, the nozzle 112 shown in FIG.
3A, the coil 16 is arranged and wound in the direction indicated by the broken line in FIG. 3A, and the hook 34 is swaged in the direction indicated by the arrow in FIGS. 3A and 3B, and the rising pieces 34a, 34b. The coil 16 may be sandwiched between and pressure resistance welding may be performed. Since the caulking direction is a direction that is not disturbed by other members, there is no problem that the electrodes for pressure resistance welding do not enter. This is particularly effective in a rotor used for a small motor.

As shown in FIG. 2, since the hook 34 is formed at a position separated from the base 18 by the extending portion 32, heat due to resistance welding is hard to be transmitted to the base 18, and the base 18 due to the heat is not transmitted. Can be prevented from deformation. Then, the electrical connection between the riser 30 and the coil 16 can be surely made.

Further, since the gap between the armature core 14 and the coil 16 wound around the armature core 14 and the hook 34 is not narrow, the step of winding the coil 16 around the hook 34 can be easily performed.

Further, since the hook 34 is arranged at a position apart from the sliding surface 26, the step of winding the coil 16 around the hook 34 can be easily performed in this respect as well.

The first notch portion 36a and the second notch portion 36b make it easier for the hook 34 to hook the coil 16 and serve as a guide for winding.

In the above embodiment, as shown in FIG. 3, the extending portion 32 is extended from the sliding surface 26 in the vertical direction (normal direction), and is raised with an imaginary line extending in this direction interposed therebetween. Although the pieces 34a and 34b are provided, the invention is not limited to this.

For example, the extending portion may be extended obliquely from the sliding surface, and a pair of rising pieces may be provided so as to sandwich an imaginary line extending in a direction perpendicular to the sliding surface. In this case, the rising piece is bent from the tip of the extending portion and is provided.

[0037]

According to the present invention, not only the deformation of the base due to the heat of pressure resistance welding can be prevented, but also the step of winding the coil around the riser can be performed easily.

Particularly, the rising piece is directed to the side opposite to the armature core.
When the coil is wound around the riser, the armature core does not get in the way when the coil is wound around the riser . It
In addition, by forming the cutout portion on the rising piece, the coil is easily hooked and wound.

[0039]

[Brief description of drawings]

FIG. 1 is a view showing a rotor according to an embodiment, (A) is a plan view and (B) is a front view.

FIG. 2 is an enlarged sectional view of a part of the rotor shown in FIG.

FIG. 3 is a view showing an integrated commutator piece and a riser,
(A) is a plan view, (B) is a front view, and (C) is a side view.

FIG. 4 is a sectional view showing a commutator mounting structure and a mounting process in a conventional rotor.

[Explanation of symbols]

10 rotor 12 rotation axes 16 coils 18 base 20 Commutator piece 26 Sliding surface 30 riser 32 Extension 34 hook 34a, 34b rising piece 36a No. 1 missing part 36b Second notch

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ishikawa ▲ Toshi ▼ Male, 390 Umeda, Kosai City, Shizuoka Prefecture Asmo Co., Ltd. (72) Inventor Nishi ▲ Zaki ▼ Hirosumi 390 Umeda, Kosai City, Shizuoka Asmo Co. (56) References 63-15157 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 13/00-13/14 H02K 3/00-3/28 H01R 39 / 00-39/64 H01R 43/027-43/28

Claims (3)

(57) [Claims] 1. A base attached to a rotating shaft, a commutator piece attached to the base on which a brush slides, and a riser provided on the commutator piece for connecting to a coil.
In the rotor of the motor having, the riser sandwiches an extension portion extending in a direction away from the brush sliding surface of the commutator piece and an imaginary line extending in a direction perpendicular to the brush sliding surface. Armature iron at the tip of the extension
A pair of rising pieces that are formed to rise toward the side opposite to the core, and a hook around which the coil is wound is formed by the pair of rising pieces, and the hooks are caulked to perform resistance welding under pressure. The rotor of the motor, wherein the coil is connected to the riser by performing. 2. A rotor of the motor according to claim 1 Symbol placement, wherein the pair of rising piece, the rotor of the motor, wherein a notch for winding hooking the coil is formed. 3. The rotor of the motor according to claim 2 , wherein the cutout portion is formed by a first cutout portion formed on the brush sliding surface side of one rising piece and another cutout portion of the other rising piece. A rotor for a motor, comprising: a second cutout formed on the opposite side of the first cutout.