JP2000278917A - Fixing structure of commutator segments in commutator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing structure of commutator segments in a commuta tor which prevents disconnection when fusing is performed, restrains increase of the number of components, does not need high precision in the molding of an insulating base part, and avoids deterioration in the curvature of a brush slide contact part when assembly is performed. SOLUTION: A recessed part 13a stretching in the radial direction is formed on the surface of a cylindrical part 12 side of a flange part 13 installed in an insulating base part 11. A fixed part 14b between a brush slide contact part 14a and a connection part 14f of the of a commutator segment 14 is fitted in the recessed part 13a. The recessed part 13a and the fixed part 14b are gradually narrowed in the outward radial direction, in order that the fixed part 14b may not be able to move toward the outside in the radial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a commutator piece in an assembled commutator for a motor.

[0002]

2. Description of the Related Art An assembled commutator for a motor includes, for example,
There is one disclosed in Japanese Patent No. 2655710.

More specifically, the insulating base of the commutator includes a cylindrical portion and a collar provided on the cylindrical portion in a flange shape. In the end wall of the cylindrical portion, holes extending in the axial direction in the base are formed at equal intervals in the circumferential direction. A projection extending in the axial direction is formed on the front wall (wall on the cylindrical portion side) of the collar. In such a base, the commutator segments are arranged at intervals in the circumferential direction.

Each commutator segment has an arc-shaped brush contact portion provided on the outer peripheral surface of the cylindrical portion. An inwardly bent tab is formed at the front end of the brush contact portion. At the rear end of the brush contact portion, a connector portion electrically connected to the coil winding is formed. The connector portion includes a radially extending wall having a hole formed therein. Each commutator segment is arranged so as to be immovable in the circumferential direction and the radial direction outside with respect to the base by inserting the tab into the hole in the cylindrical portion and the projection into the hole in the connector portion. You.

Thus, each commutator segment is:
The displacement in the circumferential direction due to the sliding contact resistance with the brush, and the lifting and peeling from the base due to the centrifugal force are prevented.
Since a relatively large force acts on each commutator segment in the circumferential direction due to the sliding contact resistance with the brush, the protrusion for fixing the commutator segment is enlarged to prevent the protrusion from being damaged. Therefore, the inside diameter of the hole in the connector portion is also increased according to the projection.

Here, the connector portion of the commutator segment and the coil winding are electrically connected to each other by fusing. As a general technique for this fusing,
First, a coil winding is wound around a substantially U-shaped wire receiving portion formed in the connector portion. This wire receiving portion is formed to have a smaller sectional area than other portions. next,
The first electrode is pressed against the wire receiving portion to crush the wire receiving portion, and the second electrode is applied to the brush contact portion. Then, in this state, a large current flows between both electrodes. At this time, the wire receiving portion having a smaller cross-sectional area than the other portions is a portion having a relatively high resistance and generates excessive heat. Then, the insulating coating of the coil winding is melted, and the coil winding and the wire receiving portion are electrically connected.

However, as described above, the wall connecting the brush contact portion of the commutator segment and the wire receiving portion is provided with a hole. Therefore, the cross-sectional area of both sides of the hole is relatively small, so that the portion becomes a relatively high-resistance portion, and there is a possibility that the portion is melted during fusing.

For this reason, as described in the publication, the second electrode is applied to a position near the wire receiving portion of the connector portion. In this case, since current flows only in the connector portion during fusing, current does not flow in both side portions of the hole in the wall, and there is no fear of fusing the commutator segments.

However, in this case, since both electrodes must be arranged at positions close to each other, it is required to arrange each electrode with high accuracy. Therefore, there is a problem that the cost of the apparatus for performing fusing increases. In addition, since the second electrode is also close to the wire receiving portion, a molten insulating film adheres to the second electrode, and the life of the electrode is significantly reduced.

A technique for solving such a problem is disclosed in Japanese Utility Model Registration No. 3033372. (A) In the assembled commutator shown in FIG. 15 of the publication, a flange portion is provided at an end of a cylindrical core. A fitting recess is formed in the flange to fit the terminal of the segment. Then, the washer is externally fitted to the core in a state where the segment is brought into close contact with the peripheral surface of the core and the terminal is fitted to the concave portion.

With this configuration, even if a large force acts on each segment in the circumferential direction due to the sliding contact resistance with the brush,
Since the terminal portion contacts the side surface of the concave portion, the segment does not shift in the circumferential direction. In addition, lifting and peeling of the segment from the core due to centrifugal force are prevented by the washer.

(B) In the assembled commutator shown in FIG. 5 of the publication, a fitting recess in which a terminal portion of a segment is fitted in a flange portion of a core, and a fitting portion in which a claw portion of a segment is fitted. A recess is formed. In addition, a concave portion is formed on the surface opposite to the fitting concave portion provided in the flange portion, into which the projected portion of the inserted segment enters. On the other hand, the segment has a main body portion which is in close contact with the peripheral surface portion of the core and in which the brush slides,
A terminal portion that stands upright at an end of the main body portion, a claw portion protruding from both sides of the terminal portion in the main body portion, and a protruding portion that protrudes toward the lower surface near the terminal portion of the main body portion. have. Then, when the terminal portion is fitted into the fitting concave portion in a state where the main body portion is brought into close contact with the peripheral surface portion of the core, the projecting portion enters the concave portion, and the segment is prevented from coming off with respect to the core and assembled.

With this configuration, even if a large force acts on each segment in the circumferential direction due to the sliding contact resistance with the brush,
Since the terminal portion abuts against the side surface of the fitting concave portion, the segment does not shift in the circumferential direction. Further, the lifting and peeling of the segment from the core due to the centrifugal force are prevented by the claw portion fitting into the fitting concave portion.

(C) In the assembly type commutator shown in FIG. 8 of the publication, a fitting recess in which a terminal portion of the segment is fitted on the surface of the core opposite to the surface opposite to the insertion side of the segment; An insertion hole reaching the fitting concave portion is formed on the insertion side surface of the segment. Then, after the terminal portion is inserted through the insertion hole, the terminal portion is erected at right angles in the concave portion, and the segment is assembled to the core.

With this configuration, even if a large force acts on each segment in the circumferential direction due to the sliding contact resistance with the brush,
Since the terminal portion contacts the side surface of the concave portion, the segment does not shift in the circumferential direction. In addition, lifting and peeling of the segment from the core due to centrifugal force are prevented by inserting the segment into the insertion hole.

Of course, since the segments shown in (a) to (b) have no holes, there is no fear that the segments are blown during the fusing.

[0017]

However, the above (a)
In the commutator shown in (1), since a washer is used for assembling the segments, the number of parts of the commutator increases.

In the commutator shown in (b) above, a protruding portion is formed on the main body portion with which the brush comes into sliding contact so as to bulge downward. For this reason, the curvature of the main body is deteriorated, and the surface of the main body with which the brush slides is not a perfect circle. This not only causes abnormal wear of the brush and lowers the durability of the motor, but also causes a loud sliding noise between the brush and the motor, which causes a reduction in quietness of the motor. Further, the core is formed by resin molding, but a fine concave portion having a thickness corresponding to the thickness of the claw portion must be formed in order to fit the claw portion of the segment into the core. There is.

In the commutator shown in (c), the terminal portion is erected at a right angle in the recess after the terminal portion is inserted into the insertion hole during assembly, so that the main body portion is easily deformed.
Then, the curvature of the main body is deteriorated, and the surface of the main body with which the brush slides is not a perfect circle. This not only causes abnormal wear of the brush and lowers the durability of the motor, but also causes a loud sliding noise between the brush and the quietness of the motor, as in (b) above. In addition, as in (b) above, a fine hole having a thickness corresponding to the thickness of the segment must be formed in order to insert the segment into the core, so that the core needs to be accurately formed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to prevent fusing at the time of fusing, suppress an increase in the number of parts, and achieve high precision in molding an insulating base. It is an object of the present invention to provide a commutator piece fixing structure in a commutator that does not require and does not deteriorate the curvature of a brush sliding contact portion during assembly.

[0021]

In order to solve the above-mentioned problems, the invention according to the first aspect of the present invention is directed to a brush sliding contact portion in which a brush slides on an insulating base having a cylindrical portion and a flange portion, and a coil. It is a fixing structure of a commutator piece in a commutator in which a commutator piece having a connection portion for electrically connecting a winding by fusing is fixed to a commutator piece, and is radially formed on a surface of the flange portion on a cylindrical portion side. A recess is formed to extend, and a fixed portion between the brush sliding contact portion and the connection portion of the commutator piece is fitted into the recess, so that the fixed portion cannot move the recess and the fixed portion radially outward. It was formed into a shape.

According to a second aspect of the invention, in the commutator fixing structure of the first aspect, a narrow portion is formed in each of the concave portion and the fixing portion. According to a third aspect of the present invention, in the commutator piece fixing structure of the first aspect, the concave portion and the fixing portion are formed so as to be gradually narrowed radially outward.

According to a fourth aspect of the present invention, in the commutator fixing structure for a commutator according to the first aspect, both circumferential sides of the concave portion and the fixing portion are formed so as to engage with each other. did.

According to a fifth aspect of the present invention, in the commutator piece fixing structure of the first aspect, the commutator piece is provided at the other end of the brush sliding portion and at the insulating base. On the other hand, a second fixing portion for fixing at least the circumferential direction and the peeling direction was provided.

According to a sixth aspect of the present invention, in the commutator fixing structure for a commutator according to the fifth aspect, a convex portion extending in an axial direction is formed on an end face of the insulating base, and the second fixing portion is formed. The portion is bent from the other end of the brush sliding portion, and a fitting hole is provided for fitting to the convex portion with respect to the fixed portion.

According to a seventh aspect of the present invention, in the commutator piece fixing structure of the fifth aspect, a second concave portion extending in a radial direction is formed on an end surface of the insulating base, and the second concave portion is formed. The fixing portion is bent from the other end of the brush sliding portion so as to fit into the second recess, and the recess and the fixing portion are so formed that the second fixing portion cannot be moved radially outward from the second recess. Was gradually narrowed toward the outside in the radial direction.

According to an eighth aspect of the present invention, in the commutator fixing structure of the first aspect, the commutator piece is provided with a detachment preventing means for preventing the commutator piece from coming off in the axial direction. According to a ninth aspect of the present invention, in the commutator piece fixing structure of the eighth aspect, the detachment preventing means uses the tension of the coil winding.

According to a tenth aspect of the present invention, in the commutator piece fixing structure of the eighth aspect, the detachment preventing means is a projecting piece provided on the commutator piece. The piece was bent to lock the commutator piece to the insulating base so that the piece did not come off in the axial direction.

Therefore, according to the first aspect of the present invention,
A concave portion extending in the radial direction is formed on the surface of the flange portion provided on the insulating base portion on the cylindrical portion side. The fixed portion between the brush sliding contact portion and the connection portion of the commutator piece is fitted into the concave portion.
The concave portion and the fixed portion are formed so that the fixed portion cannot move radially outward. In this way, even if a large force acts in the circumferential direction on the commutator piece due to the sliding contact resistance with the brush, the fixed portion abuts against the side surface of the concave portion, thereby preventing the commutator piece from shifting in the circumferential direction. Is done. In addition, since the fixing portion only forms the concave portion and the fixing portion in a shape that cannot be moved radially outward from the concave portion, the number of components does not increase and high accuracy is not required. In addition, the force in the direction in which the fixing portion moves radially outward from the recess, that is, the force in the direction in which the commutator pieces separate, is a centrifugal force or the like and is relatively small, so the fixing portion cannot move radially outward from the recess. Even if the fixing portion is formed to have a small width, the width does not become extremely narrow, so that there is no fear of fusing at the time of fusing. In addition, before the commutator piece is assembled to the insulating base, the brush sliding portion and the fixed portion are formed by press working or the like, so that the curvature of the brush sliding portion does not deteriorate during assembly.

According to the second aspect of the present invention, since the narrow portion is formed in the concave portion and the fixed portion, the fixed portion cannot be moved radially outward from the concave portion, and the commutator piece is separated from the insulating base. Is prevented.

According to the third aspect of the present invention, since the concave portion and the fixing portion are formed so as to be gradually narrowed outward in the radial direction, the fixing portion cannot be moved radially outward from the concave portion. Commutator pieces are prevented from peeling from the insulating base.

According to the fourth aspect of the present invention, since both sides in the circumferential direction of the concave portion and the fixing portion are formed so as to fit into each other so that the fixing portion does not come off in the radial direction from the concave portion. In addition, the commutator pieces are prevented from peeling off from the insulating base.

According to the fifth aspect of the present invention, the commutator piece has, at the other end of the brush sliding portion, a second fixing portion for fixing at least in the circumferential direction and the peeling direction with respect to the insulating base. Is provided. Therefore, since the second fixing portion and the fixing portion for fixing to the flange portion cooperate to fix at least the circumferential direction and the peeling direction to the insulating base portion,
It is certain.

According to the sixth aspect of the present invention, the convex portion extending in the axial direction is formed on the end face of the insulating base. The second fixing portion is formed by bending the other end of the brush sliding portion,
In addition, the fixing portion is provided with a fitting hole that fits into the convex portion of the base. Therefore, when the fitting hole of the second fixing portion and the convex portion of the base are fitted, the second fixing portion cannot move radially outward from the base, so that the commutator piece is prevented from peeling from the insulating base. Is done.

According to the seventh aspect of the present invention, the second concave portion extending in the radial direction is formed on the end surface of the insulating base. Second
The fixing portion is bent from the other end of the brush sliding contact portion so as to fit into the second recess. And the second fixing part is the second
The concave portion and the fixed portion are configured so as to be gradually narrowed outward in the radial direction so that the concave portion and the fixed portion cannot be moved radially outward from the concave portion. Therefore, since the second fixing portion cannot move radially outward from the base, the commutator pieces are prevented from peeling from the insulating base.

According to the eighth aspect of the present invention, the commutator piece is provided with a detachment preventing means for preventing the commutator piece from coming off in the axial direction.
Therefore, the commutator piece is fixed immovably in the circumferential direction, the peeling direction, and the axial direction with respect to the insulating base.

According to the ninth aspect of the present invention, the tension of the coil winding is used as the slip-off preventing means. Accordingly, the commutator pieces can be prevented from coming off in the axial direction without changing the shapes of the commutator pieces and the insulating base and without requiring any special parts.

According to the tenth aspect of the present invention, the detachment preventing means is a protruding piece provided on the commutator piece, and the protruding piece is connected to the insulating base so that the commutator piece does not come off in the axial direction. Folded to stop. Therefore, it is possible to easily prevent the commutator pieces from coming off in the axial direction without requiring any special parts.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 and 2
Indicates a main part of the motor 1. Insulation base 11 of commutator 10
Is fixed to the rotating shaft 2. The insulating base 11 is a cylindrical part 1
2 and a flange portion 13 provided in a flange shape at the base end of the cylindrical portion 12.

As shown in FIG. 4, five convex portions 12 are provided on the end face of the cylindrical portion 12 on the front end side (the side opposite to the flange portion 13).
a are formed at equal intervals in the circumferential direction. On the end face of the flange portion 13 on the side of the cylindrical portion 12, five fitting recesses 13a extending radially to the outer peripheral surface are formed at equal intervals in the circumferential direction. Each fitting concave portion 13a and each convex portion 12a are respectively arranged along the axial direction. The fitting recess 13a is formed so as to be gradually narrowed toward the outside in the radial direction as shown in FIG. 2 (L2 <L1). That is, when a commutator piece 14 described later is mounted on the insulating base 11, the radially outer side of the fitting recess 13a is so narrow that the commutator piece 14 does not rise from the cylindrical portion 12.

The insulating base 11 is formed of a thermosetting resin such as a phenol resin. Here, the insulating base (2) disclosed in Japanese Patent Publication No. 2655710 shown in the related art requires a fine portion such as a hole (10) to be formed at the time of molding, so that a crystalline polymer (thermoplastic resin) suitable for fine processing is required. ). This crystalline polymer has excellent heat resistance among thermoplastic resins, but has a considerably lower heat resistance temperature than the thermosetting resin used in the present embodiment.
Also, this crystalline polymer is a more expensive material than phenolic resin. On the other hand, a thermosetting resin such as a phenol resin is relatively unsuitable for forming a fine portion such as a hole because burrs and the like are easily generated, but the insulating base portion 11 of the present embodiment forms a fine portion. Since it is not necessary, the base 11 can be formed of a thermosetting resin such as a phenol resin. Therefore, the insulating base 11 of the present embodiment
It is excellent in heat resistance and can be formed at low cost. And, on such a base portion 11, five commutator pieces 14 as shown in Fig. 3 are arranged at intervals in the circumferential direction.

Each commutator piece 14 is in close contact with the outer peripheral surface of the cylindrical portion 12 and has an arc-shaped brush sliding contact portion 14a with which a brush (not shown) for supplying drive power to the armature core 3 is in sliding contact. It has.

At the base end of the brush sliding contact portion 14a, a first fixing portion 14b which is bent radially outward at a right angle and which fits into the fitting concave portion 13a of the flange portion 13 is formed. The first fixing portion 14b is, like the fitting recess 13a,
It is formed so as to become gradually narrower toward the outside in the radial direction (L2 <L1). When the first fixing portion 14b and the fitting recess 13a are fitted to each other due to the shape thereof, the first fixing portion 14b cannot come out radially outward from the fitting recess 13a. The base end is prevented from rising from the cylindrical portion 12. Since the force in the direction in which the first fixing portion 14b comes out of the fitting recess 13a in the radial direction, that is, the force in the direction in which the commutator piece 14 separates is centrifugal force or the like and is relatively small, the first fixing portion 14b Need not be formed extremely narrow. Further, by this fitting, the base end side of the brush sliding contact portion 14a does not shift in the circumferential direction with respect to the cylindrical portion 12.

At the tip of the brush sliding contact portion 14a, a second fixing portion 14c is formed which is bent radially inward at a right angle.
The fixing portion 14c is formed with a fitting hole 14d for fitting into the convex portion 12a of the cylindrical portion 12. And this fitting hole 1
By fitting the protrusion 4d and the convex portion 12a, the tip side of the brush sliding contact portion 14a is prevented from rising from the cylindrical portion 12. Also, this fitting allows the brush sliding contact portion 14a
Does not shift in the circumferential direction with respect to the cylindrical portion 12.

In this manner, each commutator piece 14 cannot move in the circumferential direction and the radial direction outward with respect to the base 11 by fitting the fixing portions 14b and 14c into the fitting concave portions 13a and the convex portions 12a. It is arranged in. Therefore, each commutator piece 14 is
The displacement in the circumferential direction due to the sliding contact resistance with the brush, and the lifting and peeling from the base 11 are prevented. Although a relatively large circumferential force acts on each commutator piece 14 due to the sliding contact resistance with the brush, the first fixing portion 14b abuts on the side surface of the fitting recess 13a in the circumferential direction. It can withstand directional forces sufficiently.

The first fixing portion 14b is formed with a connector portion 14e which is bent at a right angle in the axial direction and is in close contact with the outer peripheral surface of the flange portion 13. As shown in FIG. 1, a connecting portion 14f for winding the coil winding 4 extending from the armature core 3 and electrically connecting the winding 4 to the commutator piece 14 is formed on the connector portion 14e. You. Connection part 1
4f is bent radially outward in a U-shape, and its tip is disposed on the outer peripheral surface of the connector portion 14e. Further, the connecting portion 14f is formed to be narrower than the other portions, so that the cross-sectional area is smaller than the other portions.

Here, the commutator piece 14 is formed by pressing a plate material to form a brush sliding contact portion 14a having a predetermined curvature.
First and second fixing portions 1 provided at both ends of the sliding portion 14a
4b, 14c, connector portion 14 provided in first fixing portion
e is formed. That is, the commutator piece 14 of the present embodiment
Need only be attached to the insulating base 11, the curvature of the brush sliding contact portion 14a does not deteriorate.

The commutator piece 14 thus configured is electrically connected to the coil winding 4 by fusing.
More specifically, first, a coil winding is wound around a substantially U-shaped connection portion 14f formed on the connector portion 14e. At this time, the coil winding 4 is wound so that a tension pulling in the insertion direction acts on the commutator piece 14. Therefore, due to the tension of the coil winding 4, the commutator pieces 14 are assembled so as not to move in the axial direction.

Next, as shown in FIG. 1, the first electrode 5 of an apparatus (not shown) for performing fusing is pressed against the tip of the connecting portion 14f, and the tip of the connecting portion 14f contacts the connector portion 14e. While being in pressure contact with each other,
A second electrode 6 is applied to the brush contact. In this state, a large current flows between the electrodes 5 and 6.

At this time, the connecting portion 14f having a smaller cross-sectional area than other portions is a portion having a relatively high resistance, and generates excessive heat. Then, the insulating coating of the coil winding 4 is melted, and the coil winding 4 and the connecting portion 14f (the commutator piece 14) are electrically connected. As described above, since the commutator piece 14 of the present embodiment does not have a hole between the electrodes 5 and 6, there is no fear that the commutator piece 14 is blown during fusing.

As described above, in the present embodiment, the following functions and effects can be obtained. (1) A fitting recess 13 a extending in the radial direction is formed on the surface of the flange 13 provided on the insulating base 11 on the side of the cylindrical portion 12. The first fixing portion 14b of the commutator piece 14 is
3a, it is bent from one end of the brush sliding contact portion 14a. Then, the fitting recess 13a and the first
The fixing portion 14b is formed so that the width gradually decreases toward the outside in the radial direction so that the fixing portion 14b does not come out from the recess 13a in the radial direction. With this configuration, even if a large force acts on the commutator piece 14 in the circumferential direction due to the sliding contact resistance with the brush, the first fixing portion 14b abuts against the side surface of the fitting recess 13a. In the circumferential direction can be prevented.

(2) First fixing portion 14b and fitting recess 13
Since a is only formed narrower toward the outside in the radial direction, the number of parts does not increase and high precision is not required. (3) Since the force in the direction in which the first fixing portion 14b comes out of the fitting recess 13a in the radial direction, that is, the force in the direction in which the commutator piece 14 separates is a centrifugal force or the like, is relatively small. It is not necessary to form 14b extremely narrow. Therefore,
There is no worry about fusing during fusing.

(4) Prior to assembling the commutator piece 14 to the insulating base 11, the plate material is subjected to press working to form the brush sliding contact portion 14a and the first and second fixing portions 14b and 14c. . That is, since the commutator piece 14 of the present embodiment only needs to be mounted on the insulating base 11, the curvature of the brush sliding contact portion 14a does not deteriorate.

(5) The commutator piece 14 is
a, 1st, 2nd fixed parts 14b and 14c provided at both ends
As a result, it is fixed at least in the circumferential direction and in the peeling direction with respect to the insulating base 11, so that it is securely fixed.

(6) The commutator piece 14 is mounted immovably in the axial direction due to the tension of the coil winding 4. Accordingly, it is possible to prevent the commutator piece 14 from coming off in the axial direction without requiring any special parts.

The embodiment of the present invention may be modified as follows. In the following, the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the above embodiment, the first and second fixing portions 14b and 14c of the commutator piece 14 and the fitting concave portions 13a and the convex portions 12a of the insulating base portion 11 have the shapes shown in FIGS. However, the present invention is not limited to this shape.

For example, the commutator piece 20 and the insulating base 21 as shown in FIGS. To elaborate,
The first fixing portion 20a of the commutator piece 20 is formed to have a constant width toward the outside in the radial direction. First fixing portion 20a
A concave portion 20b is formed in each of the intermediate portions on both sides.
That is, a narrow portion is formed in the first fixing portion 20a. On the other hand, the fitting concave portion 21a of the insulating base 21 is formed so that the width becomes constant outward in the radial direction so that the first fixing portion 20a fits. The first fitting recess 21a has
A protrusion 21b that fits into the recess 20b of the fixing portion 20a is formed. Then, the first fixing portion 20a and the fitting concave portion 21
When the first fixing portion 20a is fitted to each other due to the shape of “a”, the first fixing portion 20a cannot come out radially outward from the fitting concave portion 21a, so that the base end side of the brush sliding contact portion 14a is prevented from floating from the cylindrical portion 12. . Further, by this fitting, the base end side of the brush sliding contact portion 14a does not shift in the circumferential direction with respect to the cylindrical portion 12. Note that the first fixing portion 20a is
Since the force in the direction radially outward from the, i.e., the force in the direction in which the commutator pieces 20 peel off is centrifugal force or the like and is relatively small, it is not necessary to form the first fixing portion 20a extremely narrow.

For example, the commutator piece 22 and the insulating base 23 as shown in FIGS. More specifically, the second fixing portion 22a of the commutator piece 22 is bent radially inward from the cylindrical portion 12 at a right angle. Second fixing part 22a
Are formed such that the width gradually decreases toward the outside in the radial direction (L4 <L3). On the other hand, the second fixing portion 22 is provided on the end surface of the insulating base portion 23 on the distal end side (opposite the flange portion 13 side).
The concave portion 23a is formed such that the width gradually decreases toward the outside in the radial direction so that a is fitted. When the second fixing portion 22a and the concave portion 23a are fitted to each other by the shape thereof, the second fixing portion 22a cannot come out of the concave portion 23a in the radial direction, so that the tip side of the brush sliding contact portion 14a is cylindrical portion 12a. From being lifted up. Further, by this fitting, the tip side of the brush sliding contact portion 14a does not shift in the circumferential direction with respect to the cylindrical portion 12.

Of course, the first fixing portion 14b shown in FIGS.
And a commutator piece including the second fixing portion 22a shown in FIGS. 9 to 12. In the above embodiment, the commutator piece 14 is connected to the coil winding 4
It is immovable in the axial direction due to the tension of
Commutator piece 24 and insulating base 25 as shown in FIGS.
The commutator piece 24 may be assembled to the base 25 so as to be immovable in the axial direction. To elaborate,
In the connector portion 14e of the commutator piece 24, projecting pieces 24a are provided on both sides of the connecting portion 14f, respectively (1 in FIG. 15).
Only one is shown). On the other hand, a concave portion 25a is formed on the outer peripheral surface of the flange portion 13 of the insulating base 25 at a position corresponding to the protruding piece 24a. Then, the commutator piece 24 is attached to the insulating base 25, that is, the first fixing portion 14b is
a, and after the second fixing portion 14c is inserted into the convex portion 12a, as shown in FIG. Folded. Even in this case, the commutator piece 24 can be easily prevented from coming off in the axial direction without requiring any special parts.

The first fixing portion 14b is press-fitted into the fitting concave portion 13a, and the second fixing portion 14c is press-fitted into the convex portion 12a so as to prevent the commutator piece 25 from coming off in the axial direction. You may. Of course, the same applies to the commutator pieces 14, 20, and 22.

In the above embodiment, the number of the commutator pieces 14 is not limited to this.

[0063]

As described in detail above, according to the present invention,
Provides a commutator piece fixing structure for commutators that prevents fusing during fusing, suppresses an increase in the number of parts, does not require high precision in molding the insulating base, and does not deteriorate the curvature of the brush sliding contact part during assembly. can do.

[Brief description of the drawings]

FIG. 1 is a perspective view of a commutator according to an embodiment.

FIG. 2 is a side view of the commutator.

FIG. 3 is a perspective view of a commutator piece.

FIG. 4 is a perspective view of the insulating base.

FIG. 5 is a perspective view of another example of a commutator.

FIG. 6 is a side view of the commutator.

FIG. 7 is a perspective view of a commutator piece.

FIG. 8 is a perspective view of the insulating base.

FIG. 9 is a perspective view of another example of a commutator.

FIG. 10 is a side view of the commutator.

FIG. 11 is a perspective view of a commutator piece.

FIG. 12 is a perspective view of the insulating base.

FIG. 13 is a perspective view of another example of a commutator.

FIG. 14 is a sectional view of the commutator.

FIG. 15 is a perspective view of a commutator piece.

FIG. 16 is a perspective view of the insulating base.

[Explanation of symbols]

4 ... Coil windings constituting the means for preventing detachment, 5, 6 ... Electrode, 11, 21, 23, 25 ... Insulation base, 12 ... Cylinder, 12a ... Protrusion, 13 ... Flange, 13a, 21a
... fitting concave portions as concave portions, 14, 20, 22, 24 ... commutator pieces, 14a ... brush sliding portions, 14b, 20a ... first fixing portions as fixing portions, 14c, 22a ... second fixing portions,
14d: fitting hole; 14f: connecting portion; 23a: concave portion as a second concave portion;

Claims (10)

[Claims] A brush sliding contact portion (14a) in which a brush slides on an insulating base (11, 21, 23, 25) having a cylindrical portion (12) and a flange portion (13), and a coil winding (14). 4) and a commutator piece (14, 20, 22, 2) having a connecting portion (14f) for electrically connecting by fusing.
4) A fixing structure of a commutator piece in a commutator to which 4) is fixed, wherein concave portions (13a, 21a) extending in a radial direction are formed on a surface of the flange portion (13) on a cylindrical portion (12) side. (13a, 21a) and the commutator pieces (14, 20, 2).
2 and 24), the fixing portions (14b, 20a) between the brush sliding contact portions (14a) and the connecting portions (14f) are fitted, and the concave portions (13a, 21a) and the fixing portions (14b,
20. The structure for fixing a commutator piece in a commutator, wherein the fixing portion (14b, 20a) is formed so as to be immovable radially outward. 2. The fixing structure of a commutator piece in a commutator according to claim 1, wherein the recesses (13a, 21a) and the fixing portions (14b, 20).
a) A structure for fixing a commutator piece in a commutator, wherein a narrow portion is formed in a). 3. The commutator piece fixing structure of the commutator according to claim 1, wherein the concave portion (13a) and the fixing portion (14b) are formed so as to be gradually narrowed radially outward. A structure for fixing a commutator piece in a commutator. 4. The commutator piece fixing structure of the commutator according to claim 1, wherein both sides in the circumferential direction of the concave portion (21a) and the fixing portion (20a) are formed so as to fit into each other. A structure for fixing a commutator piece in a commutator. 5. The commutator piece fixing structure of the commutator according to claim 1, wherein the commutator pieces (14, 20, 22, 24) are attached to the other end of the brush sliding portion (14a). , The insulating base (11,
A fixing structure of a commutator piece in a commutator, comprising: a second fixing portion (14c, 22a) for fixing at least a circumferential direction and a peeling direction to (21, 23, 25). 6. The fixing structure for a commutator piece in a commutator according to claim 5, wherein a convex portion (12a) extending in an axial direction is formed on an end face of the insulating base (11, 21, 25). A second fixing portion (14c) is formed by bending the other end of the brush sliding contact portion (14a), and is fitted to the convex portion (12a) with respect to the fixing portion (14c). The structure for fixing a commutator piece in a commutator, characterized by comprising: 7. The fixing structure for a commutator piece in a commutator according to claim 5, wherein a second concave portion (23a) extending in a radial direction is formed on an end face of the insulating base (23), and the second fixing is performed. Part (22
a) is bent from the other end of the brush sliding portion (14a) so as to fit into the second recess (23a), and the second fixing portion (22a) is radially outward from the second recess (23a). A structure for fixing a commutator piece in a commutator, wherein the concave portion (23a) and the fixing portion (22a) are gradually narrowed radially outward so as to be immovable. 8. The fixing structure of a commutator piece in a commutator according to claim 1, wherein the commutator pieces (14, 20, 22, 24) are prevented from coming off in the axial direction. A fixing structure of a commutator piece in a commutator, comprising: 9. The commutator piece fixing structure according to claim 8, wherein the detachment preventing means (4) uses the tension of the coil winding (4). Commutator piece fixing structure in 10. The commutator piece fixing structure according to claim 8, wherein the detachment preventing means (24a) includes the commutator piece (24).
A protruding piece (24a) provided on the
a) the commutator piece is fixed to the insulating base (25) so that the commutator piece (24) does not come off in the axial direction;