JP2840032B2 - Commutator for motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commutator for a motor, and more particularly, to a motor in which the fitting of a commutator for a small motor is strengthened and the assemblability at the time of fitting is improved. For commutators.

[0002]

2. Description of the Related Art Conventionally, to assemble a resin ring and a commutator main body constituting a commutator for a small electric motor, simply insert a boss portion provided on the commutator main body into a hole formed in the resin ring and integrate them. Is common.

A related gazette is Japanese Utility Model Laid-Open No. 61-14 / 1986.
880 and JP-A-63-80736.

[0004]

In the above-described conventional small motor commutator in which the resin ring and the commutator body are fitted, the resin ring and the commutator body are simply fitted. In some cases, the resin ring and the commutator body may be misaligned during operation, or the alignment may not be sufficient during assembly and the riser portion provided on the commutator body may be deformed. Further, when the resin ring and the commutator main body are fitted to each other and when the assembled commutator is inserted into the rotating shaft of the electric motor, there is a problem that positioning is difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to enhance the fitting between the resin ring and the commutator main body and to facilitate the positioning, to prevent the riser provided in the commutator main body from being deformed, and to use the commutator for rotating the motor. An object of the present invention is to provide a commutator for an electric motor that facilitates positioning when fitted to a shaft.

[0006]

According to a first aspect of the present invention, there is provided a commutator for a motor in which a commutator main body is fitted to a resin ring.
A plurality of rib-shaped protrusions are provided on at least one of an inner diameter portion of the resin ring and a boss portion surface of the commutator main body which is fitted with the resin ring, and the rib-shaped protrusions are arranged on a circumference in parallel with an axis. After the riser portion provided on the child body comes into contact with the groove formed on the side surface of the resin ring, the rib-like projection is provided to a length that effectively acts later.

According to a second aspect of the present invention, there is provided a commutator for a motor according to the present invention, wherein the commutator body has a polygonal inner hole or a plurality of grooves or a plurality of small-diameter holes in the vicinity of the shaft center on the side opposite to the resin ring. It is provided.

According to a third aspect of the present invention, there is provided a commutator for a motor according to the present invention, wherein an outer peripheral portion of the resin ring is formed in a polygonal shape, a plurality of grooves are provided in an outer peripheral portion of the resin ring, On the commutator main body side end surface, a convex portion having a shape corresponding to the iron core of the electric motor is provided.

According to a fourth aspect of the present invention, there is provided a commutator for a motor according to the present invention, wherein a plurality of parallel to the shaft center are provided between grooves in which a riser portion provided on the commutator body is fitted near an outer peripheral portion of the resin ring. A through hole is provided.

[0010]

According to the commutator for a motor according to the first aspect of the present invention, the cross-sectional shape of the rib-shaped protrusion is any one of a semicircle, a triangle, and a square, and the shape of the rib-shaped protrusion is a semi-cone. Shape, a triangular pyramid shape, or a wedge shape, and the length of the rib-shaped protrusion was set to a length that effectively functions after the riser comes into contact with the groove. For this reason, when the riser portion comes into contact with the groove, the rib-shaped protrusion has not yet been effectively actuated. At this point, the riser portion and the groove can be aligned, and the resin ring and the commutator body are press-fitted. Then, the rib-shaped projection is pressed in the radial direction, so that a strong fitting state is obtained.

Further, by using the commutator for a motor according to the second and third aspects, when the resin ring and the commutator main body are fitted together, and the commutator formed by fitting them is inserted into the rotating shaft of the motor. At this time, positioning can be easily and reliably performed by a jig corresponding to an inner hole, a groove, or a small-diameter hole formed in a side surface of the commutator body. Also, since the outer peripheral portion of the resin ring is formed in a polygonal shape, a groove is provided in the outer peripheral portion of the resin ring, or a convex portion corresponding to the shaft of the electric motor is provided on the side of the resin ring on the side opposite to the commutator, so that it is easy. In addition, positioning can be reliably performed.

Furthermore, by providing the commutator for an electric motor according to the fourth aspect, a plurality of through holes are provided in the vicinity of the outer periphery of the resin ring, so that weight can be reduced and air permeability can be improved.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

Referring to FIG. 1 and FIG. 2, this embodiment shows a structure for strengthening the fitting between the resin ring and the commutator main body.

That is, in FIG.
A plurality of rib-shaped protrusions 5 are formed on the anti-commutator main body side of the inner diameter portion 3 in parallel with the axis. Note that this rib-shaped projection 5 can be omitted if it is provided on the side of a commutator body described later.

A plurality of grooves 7 into which a riser portion provided in a commutator body described later is inserted are radially formed on the side surface of the resin ring 1 on the commutator body side.

On the other hand, as shown in detail in FIG. 2, the commutator main body 9 has a plurality of risers 13 radially provided on a shaft 11 by a known manufacturing method.
3 is inserted into the groove 7 formed in the resin ring 1 at the time of assembly. Further, a boss 1 is attached to one end of the shaft 11.
The boss 15 is fitted into the inner diameter portion 3 formed on the resin ring 1. And boss 15
A plurality of rib-shaped protrusions 17 are provided at the base in parallel with the axis.

The lengths of the rib-shaped projections 5 and 17 are the same as those of the boss 15 of the commutator body 9 on the inner diameter 3 of the resin ring 1.
The length is such that the riser portion 13 provided on the commutator body 9 comes into contact with the groove portion 7 formed in the resin ring 1 and acts effectively later when the is assembled.

Further, although not shown, reference numeral 19 denotes a through hole to be incorporated into the rotating shaft of the electric motor.

The shapes of the rib-shaped projections 5, 17 will be described in more detail.

Referring to FIGS. 3 to 8, the present embodiment describes the rib-like projection 17 formed on the boss 15 of the commutator main body 9. The projection 5 has the same shape.

FIGS. 3, 4 and 5 show a rib-like projection 1.
7 is shown. That is, the cross-sectional shape of the rib-shaped protrusion 17A shown in FIG. 3 is semicircular, the cross-sectional shape of the rib-shaped protrusion 17B shown in FIG.
The cross-sectional shape of the rib-shaped protrusion 17C shown in FIG.

FIGS. 6, 7 and 8 show the shape of the rib-like projection 17 in the longitudinal direction. That is,
The rib-like protrusion 17D shown in FIG. 6 has a semi-conical shape in the longitudinal direction, the rib-like protrusion 17E shown in FIG. 7 has a triangular pyramid, and the rib-like protrusion 17F shown in FIG. It is in shape.

With the above configuration, the length of the rib-shaped projections 5 or 17 is so short as shown in the figure that the ribs 13 provided on the commutator body 9 come into contact with the grooves 7 formed in the resin ring 1 at the time of assembly. If the length is effective later,
Even if a special positioning method is not used, the rib-shaped protrusions 5 or 17 are still just before the riser portion 13 contacts the groove portion 7.
Is not working effectively.

For this reason, the riser portion 13 and the groove portion 7 can be accurately positioned at the time of assembling, and the rib-shaped protrusions 5 or 17 can be formed in an appropriate shape from the shapes shown in FIGS. The groove 7 and the riser 13
When a press fit is performed in a state where the positions match, a strong fitting state is obtained. In particular, when the rib-shaped protrusions 5 or 17 having the shapes shown in FIGS. 6 to 8 are employed, the distal end of the rib-shaped protrusion 5 or 17 is fitted with a gap, so that the resin ring 1 and the commutator body 9 are formed. Is obtained, and the fitting can be facilitated.

Next, the groove 7 formed in the resin ring 1
Will be described in more detail.

Referring to FIGS. 9 to 12, the shape of the groove 7 shown in FIG. 9 is such that the riser portion 13 provided on the commutator main body 9 fits into the side surface of the resin ring 1 on the commutator main body side. ,
A plurality of grooves 7 are formed radially, and the depth W of the grooves 7 is about １ ／ or more of the thickness of the riser section 13 and equal to or less than the thickness of the riser section 13. Also, the groove 7
The length L is about 1/3 or more of the length of the riser portion 13 and equal to or less than the length of the riser portion 13.

The cross section of the groove 7 has the shape shown in FIG. 11 or FIG. That is, as shown in FIG. 11, the cross-sectional shape of the groove 7 is U-shaped. In the shape shown in FIG. 12, the cross-sectional shape of the groove 7 is an inverted C-shape in which the width HK of the opening is wider than the width H of the groove bottom 7T.

With the groove 7 having the above-described configuration, the riser 13 can be effectively held at the depth W of the groove 7 in the U-shaped groove 7, and the groove opening is formed in the inverted C-shaped groove 7. Since it has the effect of guiding the riser portion 13, the fitting at the time of assembly becomes easy.

With the configuration as described above, the commutator body 9
When the coil lead wire is wound around the riser portion 13, the riser portion 13 is easily deformed by being pulled by the lead wire. However, the riser portion 13 is provided in the resin ring 1 and the riser portion 13 is fitted into the groove portion 7. 13 can be prevented from being deformed.
Further, when the tip of the riser portion 13 is displaced sideways when bent, the tip comes into contact with and bites into the resin ring 1, but this is also effective in preventing this. The length L of the groove 13 is preferably short in order to save space in the winding part.

The embodiment shown in FIG. 10 shows another embodiment, and is different from the above-described embodiment in that a predetermined groove 7 is provided.
The boss 21 formed with the depth W and the length L is integrally protruded toward the riser 13 provided on the commutator main body 9 of the resin ring 1. Other configurations are the same as those of the above-described embodiment, and the same reference numerals are given and the description is omitted. Therefore, the same effect can be exhibited.

Next, the positioning means for fitting the resin ring 1 and the commutator body 9 will be described.

FIGS. 13, 14 and 15 show an embodiment in which positioning means is provided on the commutator main body 9 side.

That is, in the embodiment shown in FIG. 13, a polygonal inner hole 23 is provided on the end face of the commutator main body 9 on the side opposite to the resin ring, centering on the through hole 19 provided in the shaft core.
Further, the embodiment shown in FIG.
5 are provided. Further, in the embodiment shown in FIG. 15, a plurality of small diameter holes 27 are provided near the through hole 19.

When the resin ring 1 and the commutator main body 9 are fitted together, and when the resin ring 1 and the commutator main body 9 are fitted together to form a commutator for an electric motor, the commutator is inserted into the rotating shaft of the motor. At this time, the polygonal inner hole 23 provided on the end face of the commutator body 9,
Alternatively, by using a jig corresponding to the groove 25 or the small-diameter hole 27, positioning can be easily and reliably performed.

The embodiment shown in FIGS. 16, 17 and 18 is an embodiment in which positioning means is provided on the resin ring 1 side. That is, in the embodiment shown in FIG. 16, the outer peripheral portion of the resin ring 1 has a polygonal shape 29, and in the embodiment shown in FIG. In the embodiment shown in FIG. 18, the end face of the resin ring 1 on the side opposite to the commutator main body side is provided.
Although not shown, the projection 3 has a shape corresponding to the iron core of the electric motor.
3 are provided.

Thus, the positioning can be performed easily and reliably, similarly to the positioning means provided on the commutator main body 9 described above.

In the embodiment shown in FIG. 19, the cooling effect and the weight reduction are achieved, and the shaft core is provided between the groove portions 7 corresponding to the riser portions 13 provided on the commutator body 9 formed on the resin ring 1. A plurality of through holes 35 are formed in parallel. For this reason, the weight of the resin ring 1 is reduced and the through-hole 35 is formed.
Thereby, air circulation is good and the cooling effect of the commutator is improved.

The present invention is not limited to the above-described embodiments, but can be embodied in other modes by making appropriate changes.

[0040]

As can be understood from the above description of the embodiment, according to the first aspect of the present invention, a rib-like projection is provided on the inner diameter portion of the resin ring or the boss portion of the commutator body. The length of the rib-shaped protrusion was set to a length that effectively functions after the riser portion of the commutator body comes into contact with the resin ring groove. For this reason, even if a special positioning method is not used, the rib-shaped protrusions are not yet effective just before the riser portion comes into contact with the groove portion at the time of assembly. Is performed. In addition, the cross-sectional shape of the rib-shaped protrusion is semicircular, or triangular,
Or a square shape, the shape of the rib-like projection is a semicircular shape,
Alternatively, when a suitable shape is selected from those of a triangular pyramid shape or a wedge shape, and the grooves and the riser portions are press-fitted in the same position, a strong fitting state is obtained.

Further, according to the present invention, a polygonal shape, a groove, or a small-diameter hole is provided on the side opposite to the resin ring of the commutator main body, or the outer peripheral portion of the resin ring is made polygonal. Alternatively, a groove is provided on the outer peripheral portion of the resin ring, or a convex portion corresponding to the iron core of the electric motor is provided on the side of the resin ring opposite to the side of the commutator body.

Thus, when the resin ring and the commutator main body are fitted together, and when the commutator for the motor formed by fitting them is inserted into the motor rotating shaft, the polygon provided on the end face of the commutator main body. Easily and reliably positioned by jigs corresponding to the inner hole, groove, or small diameter hole, or the polygonal shape or groove provided on the outer periphery of the resin ring, or the convex portion corresponding to the iron core of the electric motor be able to.

Further, according to the present invention, since a plurality of through-holes are provided in the resin ring, the weight of the resin ring can be reduced, and the air flow through the through-holes can be improved to achieve a cooling effect. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a resin ring having a rib-shaped protrusion.

FIG. 2 is a perspective view of a commutator main body including a rib-shaped protrusion.

FIG. 3 is a perspective explanatory view showing the shape of a rib-shaped protrusion.

FIG. 4 is a perspective explanatory view showing the shape of a rib-shaped protrusion.

FIG. 5 is an explanatory perspective view showing a shape of a rib-shaped protrusion;

FIG. 6 is an explanatory perspective view showing the shape of a rib-shaped protrusion.

FIG. 7 is an explanatory perspective view showing a shape of a rib-shaped protrusion.

FIG. 8 is a perspective explanatory view showing the shape of a rib-shaped protrusion.

FIG. 9 is an explanatory perspective view of a groove formed in a resin ring.

FIG. 10 is a perspective explanatory view showing another embodiment of the groove formed in the resin ring.

FIG. 11 is an enlarged explanatory view showing a cross section of a groove formed in a resin ring.

FIG. 12 is an enlarged explanatory view of another embodiment showing a cross section of a groove formed in a resin ring.

FIG. 13 is an explanatory perspective view showing a positioning inner hole provided on a side surface of the commutator main body.

FIG. 14 is a perspective explanatory view showing positioning grooves provided on a side surface of the commutator main body.

FIG. 15 is an explanatory perspective view showing a small-diameter hole for positioning provided on a side surface of the commutator main body.

FIG. 16 is an explanatory perspective view showing a positioning polygon provided on the outer periphery of a resin ring.

FIG. 17 is an explanatory perspective view showing positioning grooves provided on the outer periphery of a resin ring.

FIG. 18 is an explanatory perspective view showing a positioning projection provided on a side surface of a resin ring.

FIG. 19 is a perspective explanatory view of a resin ring having a plurality of through holes.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin ring 3 Inner diameter part 5, 17 Rib-shaped protrusion part 7 Groove part 9 Commutator main body 13 Riser part 15 Boss part 23 Inner hole 25 Groove 27 Small diameter hole 29 Polygonal shape 31 Groove 33 Convex part 35 Through hole

Claims (4)

(57) [Claims] In a commutator formed by fitting a commutator main body to a resin ring, at least one of an inner diameter portion of the resin ring and a boss portion surface fitted to the resin ring of the commutator main body is provided. The rib-shaped projections are arranged on the circumference in parallel with the axis, and after the riser portion provided on the commutator body contacts the groove formed on the side surface of the resin ring, the rib-shaped projections are A commutator for an electric motor, wherein the commutator is provided in a length that works effectively. 2. A commutator body having a polygonal inner hole, a plurality of grooves, or a plurality of small-diameter holes in the vicinity of the shaft center on the side opposite to the resin ring on the shaft core. Commutator for electric motor. 3. An outer peripheral portion of the resin ring is formed in a polygonal shape, a plurality of grooves are provided in an outer peripheral portion of the resin ring, or an end face of the resin ring on a side opposite to the commutator main body corresponds to an iron core of an electric motor. The commutator for an electric motor according to claim 1, wherein a protruding portion having a curved shape is provided. 4. A plurality of through holes are provided in parallel with the shaft center between grooves in which a riser part provided on the commutator body is fitted near an outer peripheral part of the resin ring. Item 8. A commutator for an electric motor according to item 1, 2 or 3.