JPH0865968A - Commutator for motor - Google Patents

Abstract

PURPOSE: To prevent the deformation of a riser provided at a commutator body by strengthening the engagement of a resin ring with the body and easily positioning it and to easily position the commutator when the commutator is engaged with the rotary shaft of a motor. CONSTITUTION: A commutator is formed by engaging a commutator body 9 with a resin ring 1. A plurality of ribbed protrusions 5, 17 are disposed at least one of the bore 3 of the ring and the surface of a boss 15 engaged with the ring 1 of the body 9 on the circumference in parallel with an axial core, a riser 13 provided at the body 9 is brought into contact with a groove 7 formed at the side of the ring 1, and then the protrusions 5, 17 have a length or more for effectively operating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commutator for an electric motor, and more particularly, to an electric motor for strengthening fitting when assembling a commutator for a small electric motor and improving assemblability at the time of fitting. For commutator.

[0002]

2. Description of the Related Art Conventionally, in order to assemble a resin ring and a commutator body which form a commutator for a small electric motor, a boss portion provided on the commutator body is simply inserted into a hole formed in the resin ring and integrated. It is common to have

As a related publication, Japanese Utility Model Publication No. 61-14
There are Japanese Patent Laid-Open No. 880 and Japanese Patent Laid-Open No. 63-80736.

[0004]

By the way, in the small-sized motor commutator in which the above-mentioned conventional resin ring and the commutator body are fitted, only the resin ring and the commutator body are fitted. There was a problem in that the resin ring and the commutator body were misaligned during operation, and the riser portion provided in the commutator body was deformed due to insufficient alignment during assembly. Further, there is a problem that positioning is difficult when the resin ring and the commutator main body are fitted together and when the assembled commutator is inserted into the rotating shaft of the electric motor.

The object of the present invention is to strengthen the fitting between the resin ring and the commutator body and to facilitate positioning, prevent the riser provided in the commutator body from being deformed, and rotate the commutator to the electric 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]

In order to achieve the above object, a commutator for an electric motor according to a first aspect of the present invention is a commutator constructed by fitting a commutator body to a resin ring,
At least one of the inner diameter portion of the resin ring or the surface of the boss portion that fits with the resin ring of the commutator main body is provided with a plurality of rib-shaped protrusions on the circumference in parallel with the axis, The riser portion provided on the child main body has a length longer than a length at which the rib-shaped projection portion effectively acts after the riser portion comes into contact with the groove portion formed on the side surface of the resin ring.

Further, in the commutator for an electric motor of the present invention according to claim 2, it is preferable that the rib-shaped protrusion has a semicircular, triangular or rectangular cross section.

Further, in the commutator for an electric motor according to the third aspect of the present invention, it is desirable that the rib-shaped protrusion has a semiconical shape, a triangular pyramid shape, or a wedge shape.

Further, in the commutator for an electric motor of the present invention according to claim 4, a plurality of groove portions radially fitted to the riser portion provided in the commutator body are radially provided on the side surface of the resin ring on the commutator body side. It is desirable that the depth be about 1/3 or more of the riser thickness to be equal to or less than the riser thickness, and the groove length be about 1/3 or more of the riser length to be equal to or less than the riser length. is there.

Further, in the commutator for an electric motor of the present invention according to claim 5, it is desirable that the groove has a U-shaped cross section.

Further, in the commutator for an electric motor of the present invention according to claim 6, it is desirable that the cross-sectional shape of the groove is an inverted C-shape in which the width of the opening is wider than the width of the groove bottom.

Still further, according to a commutator for an electric motor of the present invention according to a seventh aspect, a polygonal inner hole or a plurality of grooves or a plurality of grooves in the vicinity of the shaft center are formed on the side surface of the commutator body opposite to the resin ring. It is desirable to provide a small diameter hole.

Further, in the commutator for an electric motor of the present invention according to claim 8, the outer peripheral portion of the resin ring is formed in a polygonal shape, or a plurality of grooves are provided in the outer peripheral portion of the resin ring, or the resin is formed. It is desirable that a convex portion having a shape corresponding to the iron core of the electric motor is provided on the end surface of the ring on the side opposite to the main body of the commutator.

Still further, according to a ninth aspect of the present invention, there is provided an electric motor commutator, which is disposed in the vicinity of the outer peripheral portion of the resin ring and between the groove portions into which the riser portion provided in the commutator body is fitted, parallel to the shaft center. It is desirable that a plurality of through holes be provided.

[0015]

With the above-described commutator for an electric motor according to claims 1, 2 and 3, the rib-shaped protrusion has a cross-sectional shape of any of a semicircle, a triangle and a square, and the rib-shaped protrusion has The shape is either a semi-conical shape, a triangular pyramid shape, or a wedge shape, and the length of the rib-shaped protrusion is set to a length that effectively acts after the riser contacts the groove. For this reason, the rib-shaped projections are not yet effective when the riser portion contacts the groove, so that the riser portion and the groove can be aligned at this point, and the resin ring and the commutator body are press-fitted. And let
The rib-shaped protrusions provide a tight fit. In addition,
Even if the rib-shaped projections are provided over the entire length of the resin ring inner diameter portion or the entire length of the commutator body boss portion, a strong fitting state can be obtained.

By using the commutator for an electric motor according to claims 4, 5 and 6, a groove is formed in the resin ring and the groove opening is formed in a U shape or an inverted C shape so that the riser portion can be easily fitted. And Further, since the riser portion can be held in the groove, deformation of the riser portion can be prevented.

Further, by using the commutator for an electric motor according to claims 7 and 8, when the resin ring and the main body of the commutator are fitted together, and the commutator formed by fitting these is inserted into the rotary shaft of the electric motor. At this time, the jig corresponding to the inner hole, the groove, or the small-diameter hole formed on the side surface of the commutator body can be positioned easily and surely. In addition, since the outer peripheral part of the resin ring has a polygonal shape, a groove is provided in the outer peripheral part of the resin ring, or a convex part corresponding to the shaft core of the electric motor is provided on the side surface of the resin ring on the side opposite to the commutator, it is easy. In addition, the positioning can be surely performed.

Furthermore, by using the commutator for an electric motor according to claim 9, since a plurality of through holes are provided in the vicinity of the outer peripheral portion of the resin ring, the weight is reduced and the air permeability is improved.

[0019]

Embodiments of the present invention will be described in detail below with reference to the drawings.

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

That is, in FIG. 1, the resin ring 1
A plurality of rib-shaped projections 5 are formed on the inner diameter part 3 on the side opposite to the main body of the commutator, parallel to the axis. The rib-shaped protrusion 5 can be omitted if it is provided on the commutator main body side described later.

On the side surface of the resin ring 1 on the commutator body side, a plurality of groove portions 7 into which a riser portion provided in a commutator body to be described later is inserted are radially formed.

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

The lengths of the rib-shaped projections 5 and 17 are such that the inner diameter portion 3 of the resin ring 1 and the boss 15 of the commutator body 9 are arranged.
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 then acts effectively afterward when it is fitted and assembled. However, the lengths of the rib-shaped protrusions 5 and 17 may be the entire width of the inner diameter portion 3 of the resin ring 1 or the entire length of the boss portion 15 of the commutator body 9.

Further, although not shown, reference numeral 19 is a through hole for being incorporated in the rotary shaft of the electric motor.

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

With reference to FIGS. 3 to 8, the present embodiment will describe the rib-shaped protrusions 17 formed on the boss portion 15 of the commutator body 9, but the rib-shaped protrusions formed on the inner diameter portion 3 of the resin ring 1 will be described. The protrusions 5 have the same shape.

In FIGS. 3, 4 and 5, rib-shaped protrusions 1 are shown.
7 is shown. That is, the rib-shaped protrusion 17A shown in FIG. 3 has a semicircular sectional shape, and the rib-shaped protrusion 17B shown in FIG. 4 has a triangular sectional shape.
The cross-sectional shape of the rib-shaped protrusion 17C shown in is a square.

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

With the above structure, the length of the rib-like protrusion 5 or 17 is short as shown in the drawing, and the riser portion 13 provided in the commutator body 9 comes into contact with the groove portion 7 formed in the resin ring 1 during assembly. If you set the length to work effectively later,
Even if the riser portion 13 does not come into contact with the groove portion 7 even if no special positioning method is adopted, the rib-shaped protrusion portion 5 or 17 is still formed.
Is not working effectively.

Therefore, the riser portion 13 and the groove portion 7 can be accurately positioned at the time of assembling, and the rib-like protrusion portion 5 or 17 can be formed into an appropriate shape from the shapes shown in FIGS. 3 to 8. By selecting, a strong fitting state can be obtained. In particular, when the rib-shaped protrusion 5 or 17 having the shape shown in FIGS. 6 to 8 is adopted, a clearance fits at the tip of the rib-shaped protrusion 5 or 17,
The effect of guiding the resin ring 1 and the commutator body 9 is obtained,
The fitting can be facilitated.

When the rib-like protrusions 5 or 17 are provided over the entire length of the inner diameter portion 3 of the resin ring 1 or the entire length of the boss portion 15 of the commutator body 9, the rib-like protrusions 5 or 17 are formed. A strong fitting state can be obtained regardless of the shape.

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

With reference to FIGS. 9 to 12, the shape of the groove portion 7 shown in FIG. 9 is such that the riser portion 13 provided in the commutator body 9 fits on the side surface of the resin ring 1 on the commutator body side. ,
A plurality of grooves 7 are formed in a radial pattern, and the depth W of the grooves 7 is about ⅓ 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-sectional shape of the groove portion 7 is the shape shown in FIG. 11 or 12. That is, as shown in FIG. 11, the groove 7 has a U-shaped cross section. Further, in the shape shown in FIG. 12, the cross-sectional shape of the groove portion 7 is an inverted V shape in which the width HK of the opening is wider than the width H of the groove bottom portion 7T.

By adopting the shape of the groove portion 7 having the above structure, the riser portion 13 can be effectively held by the depth W of the groove portion 7 in the U-shaped groove portion 7, and the groove opening portion can be formed in the inverted C-shaped groove portion 7. Since it has an effect of guiding the riser portion 13, fitting at the time of assembly becomes easy.

The commutator body 9 having the above-mentioned configuration
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, by providing the groove portion 7 in the resin ring 1 and fitting the riser portion 13 into the groove portion 7, The deformation of 13 can be prevented.
Further, when the tip of the riser portion 13 is laterally displaced when bending, the tip comes into contact with the resin ring 1 and bites into it, 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 portion.

The embodiment shown in FIG. 10 shows another embodiment, and is different from the above-mentioned embodiment in that the predetermined groove portion 7 is provided.
The point is that the boss portion 21 formed with the depth W and the length L is integrally projected to the side of the riser portion 13 provided on the commutator body 9 of the resin ring 1. The other structure is the same as that of the above-described embodiment, and the same reference numerals are given to omit the description. 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 body 9 side.

That is, in the embodiment shown in FIG. 13, a polygonal inner hole 23 is provided on the end surface of the commutator body 9 on the side opposite to the resin ring, with the through hole 19 provided in the shaft center as the center.
Further, in the embodiment shown in FIG. 14, the groove 2 communicating with the through hole 19 is used.
A plurality of 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 body 9 are fitted together, and when the resin ring 1 and the commutator body 9 are fitted together to form a commutator for an electric motor, the commutator for the electric motor is inserted into the rotary shaft of the electric motor. At this time, a 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 performed easily and surely.

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. 17, a plurality of grooves 31 are formed in the outer peripheral portion of the resin ring 1. The example shown in FIG. 18 is provided on the end surface of the resin ring 1 opposite to the commutator body side.
Although not shown, the protrusion 3 has a shape corresponding to the iron core of the electric motor.
A plurality of 3 are provided.

Thus, the positioning can be performed easily and surely like the positioning means provided on the commutator body 9 described above.

The embodiment shown in FIG. 19 is intended for cooling effect and weight reduction. A shaft core is formed 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 provided in parallel. Therefore, the weight of the resin ring 1 is reduced and the through hole 35 is formed.
As a result, the air flow 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 implemented in other modes by making appropriate changes.

[0047]

As will be understood from the above description of the embodiments, according to the present invention according to claims 1, 2 and 3,
A rib-shaped protrusion is provided on the inner diameter of the resin ring or on the boss of the commutator body, and the length of the rib-shaped protrusion is the length that works effectively after the riser of the commutator body contacts the resin ring groove. It was over. For this reason, even if no special positioning method is used, the rib-shaped projections have not yet been effectively acted immediately before the riser portion contacts the groove portion during assembly, so accurate positioning of the riser portion and the groove portion at this point Is performed. In addition, the rib-shaped protrusion has a cross-sectional shape of a semicircle, a triangle, or a square, or the rib-shaped protrusion has a semicircular projection, a triangular pyramid, or a wedge-shaped appropriate shape. By selecting, a strong fitting state can be obtained.

Further, according to the present invention according to claims 4, 5 and 6, a groove portion into which the riser portion provided in the commutator body is fitted is provided on the side surface of the resin ring on the commutator body side, and the length of the groove portion is set. About 1/3 or more of the riser thickness is set equal to or less than the riser thickness, and the length of the groove is set to about 1/3 or more of the riser length to equal to or less than the riser length.

Therefore, when the coil lead wire is wound around the riser portion provided in the commutator main body, the riser portion is easily deformed by being pulled by the lead wire, but a groove portion is provided in the resin ring, and the riser portion is formed in this groove portion. The fitting can prevent deformation of the riser portion.

Further, the groove is formed such that the cross-sectional shape of the groove is a U-shape or an inverted C-shape. Either of them can be selected and adopted to facilitate fitting at the time of assembly. The riser portion can be securely held to prevent deformation.

Further, according to the present invention according to claims 7 and 8, a polygonal shape, a groove, or a small-diameter hole is provided on the side of the resin ring opposite to the commutator 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 opposite side of the resin ring from the commutator body side.

Thus, when the resin ring and the commutator main body are fitted together, and when the commutator for an electric motor formed by fitting them is inserted into the rotary shaft of the electric motor, a polygonal shape provided on the end face of the commutator main body is formed. Easy and reliable positioning with a jig corresponding to the inner hole, groove, small diameter hole, polygonal shape provided on the outer peripheral part of the resin ring, groove, or convex part corresponding to the iron core of the electric motor. be able to.

Furthermore, according to the present invention of claim 9, since the resin ring is provided with a plurality of through holes, the resin ring can be made lighter, and the air can be circulated well through the through holes to achieve a cooling effect. .

[Brief description of drawings]

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

FIG. 2 is a perspective view of a commutator body having rib-shaped protrusions.

FIG. 3 is a perspective view illustrating the shape of rib-shaped protrusions.

FIG. 4 is an explanatory perspective view showing the shape of rib-shaped protrusions.

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

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

FIG. 7 is a perspective view illustrating the shape of a rib-shaped protrusion.

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

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

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

FIG. 11 is an enlarged explanatory view showing a cross section of a groove portion 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 a perspective explanatory view showing a positioning inner hole provided on the side surface of the commutator body.

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

FIG. 15 is a perspective view showing a small diameter hole for positioning, which is provided on the side surface of the commutator body.

FIG. 16 is a perspective explanatory view showing a polygonal shape for positioning provided on the outer periphery of a resin ring.

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

FIG. 18 is a perspective explanatory view showing a positioning convex portion 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 projection part 7 Groove part 9 Commutator 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 W Groove depth L Groove length

Claims (9)

[Claims] 1. A commutator configured by fitting a commutator body to a resin ring, wherein a plurality of members are provided on at least one of an inner diameter portion of the resin ring or a surface of a boss portion fitted with the resin ring of the commutator body. The rib-shaped protrusions are arranged on the circumference parallel to the axis, and the rib-shaped protrusions are provided after the riser portion provided in the commutator body comes into contact with the groove formed on the side surface of the resin ring. A commutator for an electric motor, characterized by comprising a length of at least effective. 2. The cross section of the rib-like protrusion is semicircular, triangular or rectangular.
Commutator for the electric motor described. 3. The commutator for an electric motor according to claim 1, wherein the rib-shaped protrusion has a semiconical shape, a triangular pyramid shape, or a wedge shape. 4. A plurality of grooves are formed radially on the side surface of the resin ring on the side of the commutator body to which the riser portion provided in the commutator body is fitted, and the depth of these groove portions is about ⅓ or more of the riser thickness. 4. The commutator for an electric motor according to claim 1, wherein the length of the groove is about 1/3 or more of the riser length and the riser length is equal to or less than the riser thickness. 5. The commutator for an electric motor according to claim 1, wherein the cross-sectional shape of the groove is U-shaped. 6. The commutator for an electric motor according to claim 1, wherein the cross-sectional shape of the groove is an inverted C-shape in which the width of the opening is wider than the width of the groove bottom. 7. The commutator main body is provided with a polygonal inner hole or a plurality of grooves in the shaft center on the side opposite to the resin ring side, or a plurality of small diameter holes in the vicinity of the shaft center. , 2, 3, 4, 5 or 6 commutator for electric motor. 8. An outer peripheral portion of the resin ring is formed into a polygonal shape, or a plurality of grooves is provided in the outer peripheral portion of the resin ring, or an iron core of an electric motor is attached to an end surface of the resin ring on the side opposite to the main body of the commutator. The commutator for an electric motor according to claim 1, 2, 3, 4, 5 or 6, wherein a convex portion having a corresponding shape is provided. 9. A plurality of through holes are provided in parallel with the shaft center between groove portions in the vicinity of the outer peripheral portion of the resin ring into which the riser portion provided in the commutator body is fitted. A commutator for an electric motor according to claim 1.