JP2002369456A - Commutator and motor with brush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a commutator which can be attached, without using fitting rings and realize cost reduction by reducing the number of components. SOLUTION: This commutator comprises a commutator holder 10 and three commutator segments 20 with terminals. The commutator holder has a cylindrical part 11 and individual pedestal 13, formed integrally on the outer circumference of the cylindrical part 11 and insertion holes 13a are formed in the pedestal. Each commutator segment has a commutator segment part 21, an inertion protrusion 22, a clamp 23 extending from one end side of the segment for holding the pedestal, and a terminal 24. The clamp 23 comprises a pair of elastic flexible parts 23a and 23a and an engagement part 23b, which can be engaged with the rear surface of the pedestal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor with a brush, and more particularly to a structure for mounting a commutator.

[0002]

2. Description of the Related Art Conventionally, as a commutator (commutator) in a brushed micromotor, a tubular portion (shaft mounting portion) into which a motor shaft is to be press-fitted and fixed is integrally provided with a flange-shaped pedestal portion. With a commutator holder made of resin, three commutator pieces with metal terminals, and three terminals fixed to the outer peripheral surface of the cylindrical part by abutting the commutator pieces on the flange-shaped pedestal part It has a washer as a fitting ring for simultaneously tightening the commutator pieces to the cylindrical portion.

[0003]

However, the commutator structure has the following problems.

(1) In a state where three commutator pieces with terminals are positioned and circulated on the outer peripheral surface of the cylindrical portion on the flange-shaped pedestal portion, a washer is used for the commutator of the three commutator pieces with terminals. When fitted to one piece, any commutator piece is in an irregular state in which it is not in close contact with the tubular part, and there is an inconvenience in assembling that it is difficult to fit in the washer. In particular, the commutator of the micromotor has a very small size of about several millimeters, the fitting tolerance must be strict, and the assembling operation of the commutator requires skilled skills, which is an obstacle to production efficiency.

(2) In addition to the high assembling cost, a washer as a fitting ring is required, which leads to a high cost of the micromotor.

(3) In the above assembly structure, the base of the terminal portion of each commutator piece extending in the radial direction overlaps the flange-shaped pedestal portion, and the base is sandwiched between washers.
The length of the commutator piece in the generatrix direction must be extra longer than the effective length of the brush-slidable portion by the thickness of the washer, and is fixed to the motor shaft in comparison with the external dimensions of the motor. It becomes difficult to increase the length of the laminated core. For this reason, the motor output is sacrificed by a few percent corresponding to the thickness of the washer.

[0007] In view of the above problems, the first aspect of the present invention.
It is an object of the present invention to provide a commutator and a motor with a brush, which can be assembled without requiring a fitting ring, and which can realize cost reduction by reducing the number of parts. Second embodiment of the present invention
An object of the present invention is to provide a commutator and a motor with a brush, which can reduce the length of a commutator piece by the thickness of an unnecessary fitting ring, thereby realizing a compact or high output.

[0008]

Means for Solving the Problems In order to solve the above-mentioned first problem, the means adopted by the present invention is to provide a clamping means for a commutator holder for each commutator piece with a terminal instead of one part of a fitting ring. The point is that they have been integrated.

That is, according to the present invention, a commutator holder having a pedestal portion integrally provided on an outer peripheral surface of a cylindrical portion, and a commutator piece portion attached to and fixed to the outer peripheral surface of the cylindrical portion on the pedestal portion. A commutator having a plurality of commutator pieces with terminals, the commutator having a commutator on the outer peripheral surface, on the surface side of the pedestal portion facing the cylindrical portion and on one end side in the generatrix direction of the commutator piece portion. A commutator piece with a terminal has a pair of mating parts for positioning in a state in which the pieces are in contact with each other, and the commutator piece with the terminal has a clamp part extending radially from the one end side and holding the pedestal part. It is characterized by comprising.

[0010] In this configuration, when the pair of the commutator pieces is positioned by engaging the pair of the commutator pieces on the one end side of the commutator holder, the terminal and the terminal are connected to each other. The commutator piece is fixed in a state where the commutator piece is in contact with the outer peripheral surface of the cylindrical portion because the clamp portion of the portion connecting the two grips the pedestal portion. Therefore, the commutator assembly is completed simply by performing an assembling operation for each commutator piece with a terminal on the commutator holder, thereby contributing to an improvement in productivity and reducing costs by eliminating the need for a fitting ring. Can be realized.

In order to suppress the protrusion diameter of the terminal portion, the commutator piece with the terminal may be configured to have a terminal portion extending substantially radially from one end thereof.

When the overhang diameter of the terminal portion does not matter much, the commutator piece with the terminal may have a configuration having a terminal portion extending substantially radially from the clamp portion.
In such a case, various types of springs may be used as the clamps by forming, for example, bending, cutting, and twisting using a portion connecting one end of the commutator piece to the terminal. In order to solve the second problem, the clamp portion may be a first valley-bent bent portion cut and raised substantially in the radial direction from the one end portion side, and the substantially radial direction may be obtained. And an elastic flexible portion having at least a mountain-folded bent portion bent to the back side of the pedestal portion and a second valley-folded bent portion integrally connected to the terminal portion, and a pedestal portion located at the base side of the terminal portion. And a hook that can be hooked on the back surface.

[0013] According to the clamp portion of this form, the engaging portion is formed by merely engaging the paired portion on one end side of the commutator piece with the paired portion on the surface of the pedestal portion of the commutator holder in the generatrix direction. After the elastic flexible portion elastically expands while sliding on the outer peripheral surface of the pedestal portion, the latch portion is latched on the back surface of the pedestal portion, so that the commutator piece is prevented from coming off from the pedestal portion. Self-fixed stubbornly. Therefore, a one-touch assembling operation for each commutator piece is sufficient, productivity can be greatly improved, and assembling can be automated. The projecting portion of the first valley-folding bent portion and the mountain-folding bent portion of the elastic flexible portion only faces the commutator piece, and this extends the terminal portion from the commutator piece of the conventional commutator. Since it corresponds to the base portion, the length of the commutator piece is reduced by the thickness of the fitting ring, so that downsizing or high output can be realized. In addition, since the clamp portion having such a configuration can be formed by cutting and bending press working, only initial investment of a press die is required.

One commutator piece may have one elastic flexible portion, and the pedestal portion may be a flange-shaped portion that orbits the outer peripheral surface of the cylindrical portion. In order to make use of the elasticity of the elastic flexible portion, a pair of elastic flexible portions extending from both sides of the pair at the one end is used as the elastic flexible portion, and a space between the pair of elastic flexible portions is used as the pedestal portion. It is desirable to use an individual pedestal part that can be fitted into the pedestal. In such a case, the hook portion corresponds to a bridging portion between the pair of second valley-folding bent portions, the hooking area is widened, and the pair of elastic flexible portions is symmetrical about the pair even portion. , It is possible to equalize the locking force. Further, the deformation of the terminal portion in the step of binding the lead wires can be suppressed.

The outer peripheral surface of the individual pedestal portion is desirably a tapered surface whose diameter gradually decreases in the radial direction from the back surface to the front surface. The guiding action of the tapered surface makes it easier to insert the commutator pieces.

The commutator piece and the terminal are formed not in a right-angled relationship but in an obtuse-angled relationship in advance, so that when the insertion is completed, the other end of the commutator piece becomes a tubular portion. Since it is in a state of leaning back elastically, the degree of adhesion is increased, and the commutator piece can be prevented from floating.

The mating part of the mating type is constituted by an insertion hole formed in the base portion in the direction of the generatrix of the outer peripheral surface of the cylindrical portion, and an insertion protruding piece extending from the one end. desirable. The insertion protruding piece positions and fixes one end side of the commutator piece portion, and a pair of elastic flexible portions can easily apply a clamping force to the pedestal portion, so that robust fixing can be realized. Further, since the insertion protruding piece can be formed by the remaining portion of the pair of cut and raised elastic flexible portions, the press working becomes easy.

By using the commutator having such a structure, it is possible to obtain a low-cost, small-sized or high-output brush motor.

[0019]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a commutator according to one embodiment of the present invention, FIG. 2 is a plan view thereof, and FIGS.
(C) is a longitudinal cross-sectional view which shows the aspect which assembles a commutator piece to a commutator holder.

The commutator used in the small-sized motor with a brush of this embodiment comprises a commutator holder 10 made of resin and three commutator pieces 20 with metal terminals.

The commutator holder 10 has a cylindrical portion (inner diameter of about 1.2 mm) 11 into which the motor shaft is press-fitted and fixed, a flange portion 12 integrally formed on the outer peripheral surface thereof, And a separate pedestal portion 13 integrally formed every 120 ° of the portion. On the surface of each individual pedestal portion 13, an insertion hole 13 a having an irregular hole cross section (substantially rectangular) is formed on the cylindrical portion 11 side. The outer peripheral surface 13b of the individual pedestal 13 is a tapered surface whose diameter gradually decreases in the radial direction from the back surface to the front surface.

On the other hand, each commutator piece 20 with a terminal is connected to the commutator piece 2 on the pedestal 13 and in contact with the outer peripheral surface of the cylindrical portion 11.
1, an insertion protruding piece 22 having an irregular cross section (substantially rectangular shape) extending from one end side in the generatrix direction, and a clamp portion 23 extending from one end side and elastically gripping the pedestal portion 13.
And a terminal portion 24 extending substantially in the radial direction from this.

The clamp portion 23 has a first valley-folded bent portion P ₁ cut and raised substantially from both sides of the insertion protruding piece 22 on the one end side, and the back side of the pedestal portion 13 from the substantially radial direction. a pair of elastic flexible portion 23a, 23a having the second valley fold bent portion P ₃ mountain fold bent portion P _2, and which are integrally connected to the terminal portion 24 is bent in, located at the base side of the terminal portion 24 Together with a pair of second valley fold bending portions P ₃ , P ₃
And a hooking portion 23b which can be hooked on the back surface of the pedestal portion 13. A pair of elastic flexible portions 23
The vacant space S between a and 23a can be fitted into the individual pedestal portion 13.

In such a commutator assembling operation, it is only necessary to insert the insertion protruding pieces 22 of the respective commutator pieces 20 into the insertion holes 13a of the individual pedestals 13 of the commutator holder 10. That is, as shown in FIG.
While the sliding portion is in sliding contact with the outer peripheral surface of the cylindrical portion 11, the free space S between the pair of elastic flexible portions 23a, 23a is adjusted so that the tip of the insertion protruding piece 22 fits into the insertion hole 13a. When the commutator piece 20 is pushed in so as to be fitted to the upper surface 13, the curved edge of the hook portion 23 b comes into contact with the upper curved edge of the outer peripheral surface 13 b of the individual pedestal portion 13, and as shown in FIG. At the same time, the upper portion of the individual pedestal portion 13 fits into the empty space S, and at the same time, the reaction causes the elastic flexible portions 23a, 23a to resiliently expand and the terminal portion 24 to jump up, and the tip of the insertion protruding piece 22 to be inserted. It enters into the insertion hole 13a. Subsequently, when the commutator piece 20 is pushed in, as shown in FIG.
b elastically passes through the outer peripheral surface 13b of the individual pedestal portion 13, the edges of the elastic flexible portions 23a, 23a contact the reduced diameter portion W below the pedestal portion by the elastic restoring force of the elastic flexible portions 23a, 23a. The hook 22 stops on the back surface 13c of the pedestal portion, and the base of the insertion protrusion 22 fits into the insertion hole 13a.

When the insertion is completed, some elastic restoring force remains in the elastic flexible portions 23a, 23a, so that the clamp portion 23 elastically grips or holds the individual pedestal portion 13. Therefore, the commutator pieces 20 are self-fixed at the individual pedestals 13. On the lower side of the commutator piece 20, the insertion protruding piece 22 and the hooking portion 23b are elastically sandwiched between the individual pedestals 13, and the hooking of the hooking portion 23b prevents the slippage. . Since the individual pedestal portion 13 made of resin is slightly elastically deformed by being sandwiched between the individual pedestal portions 13 and both surfaces thereof slightly swell, the individual pedestal portion 1
3 is also in a state of being held between the elastic flexible portions 23a, 23a, and robust self-fixing is achieved.

As described above, the commutator can be assembled in one touch without a fitting ring, thereby contributing to an improvement in productivity and a reduction in cost. For this reason, assembly automation is also possible. In addition, the length of the commutator piece 21 is reduced by the thickness of the fitting ring, so that downsizing or high output can be realized. Since the elastic flexible portions 23a, 23a can be obtained by cutting and raising from both sides of the insertion protruding piece 22 and bending and forming,
Only a press-type initial investment is required.

The hook portion 23b corresponds to a bridge portion between the pair of second valley-folding bent portions P ₃ and P ₃ , has a large hooking area, and has a pair of Since the elastic flexible portions 23a, 23a are symmetrically arranged, the locking force can be equalized. Even when a force is applied in the direction of the axis when the lead wire is entangled with the terminal portion 24, the inner side surfaces of the pair of elastic flexible portions 23a, 23a abut against the side surfaces of the individual pedestal portion 13 to prevent rotation. Since it has the function, the deformation of the terminal portion 24 can be suppressed. Further, since the outer peripheral surface 13c of the pedestal portion 13 is a tapered surface, the commutator piece 20 can be easily inserted by its guiding action.

The commutator piece 21 and the terminal 24 are not formed in a right-angled relationship but in an obtuse-angled relationship in advance, so that when the insertion is completed, the upper end of the commutator piece 21 is cylindrical. Since it is in a state of leaning against the portion 11 elastically, the degree of adhesion is increased, and the commutator piece 21 can be effectively prevented from floating.

[0029]

As described above, in the commutator according to the present invention, the clamp means for the commutator holder is integrally provided for each commutator piece with a terminal in order to substitute the function of one part of the fitting ring. Therefore, the following effects can be obtained.

First, the surface of the pedestal portion facing the cylindrical portion and one end of the commutator piece in the generatrix direction are connected to the outer peripheral surface of the cylindrical portion with the commutator piece attached. A commutator piece having a phase-engaging pair for positioning, and a commutator piece with a terminal extending radially from the one end side and having a clamp portion for gripping a pedestal portion, By simply performing an assembling operation for each commutator piece with a terminal, assembly of the commutator is completed, thereby contributing to an improvement in productivity and realizing low cost by eliminating the need for a fitting ring.

Second, in the case where the commutator piece with a terminal has a terminal portion extending substantially in the radial direction from the clamp portion, the clamp portion is formed by cutting and raising the terminal portion substantially in the radial direction from the one end side. An elastic flexible portion including at least one valley-folded bent portion, a mountain-folded bent portion bent from the substantially radial direction to the back side of the pedestal portion, and a second valley-folded bent portion integrally connected to the terminal portion; It is located on the base side of the unit and has a hook that can be hooked on the back of the pedestal, so one-touch assembling operation for each commutator piece is sufficient, and productivity can be greatly improved. Automation is also possible. Also,
The length of the commutator piece is shortened by the thickness of the retaining ring, so that downsizing or high output can be realized. Furthermore, since it can be formed by cutting and bending press working, only initial investment of a press die is required.

Third, the elastic flexible portion is a pair of elastic flexible portions extending from both sides of the paired portion on the one end portion side, and the pedestal portion is fitted into a space between the pair of elastic flexible portions. If possible individual pedestals are used, the hooking portion corresponds to a bridging portion between the pair of second valley-folding bent portions, and the hooking area becomes large. Since the bending portions are arranged symmetrically, the locking force can be equalized. Further, the deformation of the terminal portion in the step of binding the lead wires can be suppressed.

Fourth, when the outer peripheral surface of the individual pedestal portion is a tapered surface, the guiding action makes it easier to insert the commutator pieces.

Fifth, an insertion hole formed in the pedestal portion in the direction of the generatrix on the outer peripheral surface of the cylindrical portion and an insertion protruding piece extending from the one end side are adopted as the mating pair of the phase engagement type. Then, the insertion protruding piece positions and fixes one end side of the commutator piece portion, and the pinching force to the pedestal portion is easily applied to the pair of elastic flexible portions, so that a robust fixing can be realized. Further, since the insertion protruding piece can be formed by the remaining portion of the pair of cut and raised elastic flexible portions, the press working becomes easy.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a commutator according to an embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIGS. 3A to 3C are longitudinal cross-sectional views each showing a mode in which a commutator piece is assembled to a commutator holder.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Resin commutator holder 11 ... Cylindrical part 12 ... Flange part 13 ... Individual pedestal part 13a ... Insertion hole 13b ... Outer peripheral surface 13c ... Bottom 20 ... Commutator piece with metal terminal 21 ... Commutator piece part 22 ... Insertion protruding piece 23. Clamp part 23 a. Elastic flexible part 23 b. Hook part 24. Terminal part P _1. First valley fold bending part P ₂ … Mountain fold bending part P ₃ . Part S: Empty space W: Reduced diameter part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H613 AA01 AA02 BB04 GA03 GA06 GB01 GB02 GB08 GB09 GB13 GB17 KK02 KK05

Claims (7)

[Claims] 1. A commutator holder having a pedestal portion integrally provided on an outer peripheral surface of a tubular portion, and a commutator piece portion is fixed on the pedestal portion to an outer peripheral surface of the tubular portion. A commutator having a plurality of commutator pieces with terminals, wherein the outer peripheral surface is formed on a surface side of the pedestal portion facing the cylindrical portion and one end side of the commutator piece portion in a generatrix direction. A commutator piece with a terminal is provided with a pair of mating parts for positioning the commutator pieces in contact with each other, and the commutator piece with the terminal extends from the one end side to clamp the pedestal portion. A commutator comprising: 2. The commutator according to claim 1, wherein the commutator piece with a terminal has a terminal portion extending substantially radially from the clamp portion. 3. The method according to claim 2, wherein
A first valley bent portion cut and raised substantially in the radial direction from the one end portion side, a mountain bent bent portion bent from the substantially radial direction to the back side of the pedestal portion, and a second portion integrally connected to the terminal portion A commutator comprising: an elastic flexible portion having at least a valley-bent bent portion; and a hooking portion located on the base side of the terminal portion and hookable on the back surface of the pedestal portion. 4. The elastic flexible part according to claim 3,
It is a pair of elastic flexible portions extending from both sides of the pair of the one end side, and the pedestal portion is an individual pedestal portion that can be fitted into a space between the pair of elastic flexible portions. And a commutator. 5. The commutator according to claim 4, wherein the outer peripheral surface of the individual pedestal portion is a tapered surface whose diameter gradually decreases in a radial direction from the back surface to the front surface. 6. The insertion hole according to claim 1, wherein the mating part of the mating type is formed in a surface of the pedestal part in a direction along a generatrix of an outer peripheral surface of the cylindrical part. When,
A commutator, which is an insertion protruding piece extending from the one end side. 7. A brush-equipped motor using the commutator defined in any one of claims 1 to 6.