JP3064838B2 - Armature of commutator type rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature of a commutator type rotating electric machine.

[0002]

2. Description of the Related Art A conventional armature of a commutator-type rotating electric machine has a plurality of commutator pieces which are electrically insulated from a rotating shaft and are arranged circumferentially around the rotating shaft. JP 63
Japanese Patent Application Laid-Open No. 194541 discloses that a brush contact portion extending outward in the axial direction is partially buried in the surface of a molded resin cylinder (insulating material) fitted on a rotating shaft, and is inclined in the circumferential direction inside the molded resin cylinder. Embedding the inner conductor extending in the axial direction, extending the outer riser portion radially from one end of the brush contact portion, and between the outer riser portion and the armature core while electrically insulating the inner riser from the both, A commutator piece having an inner riser portion extending radially from one end is disclosed. By doing so, the coil end can be omitted.

A surface-type commutator in which commutator pieces are radially arranged in a radial direction is also known. In the surface type commutator, the commutator piece does not have to be carried on the outer peripheral portion of the molded resin cylinder, which is advantageous in high-speed rotation.

[0004]

However, a commutator-type small DC motor used for a starter for an automobile is required to be particularly small and lightweight, and a means for increasing the speed of the motor by employing a speed reduction mechanism therein is employed. Have been. Therefore, in order to withstand higher-speed rotation, the armature as the rotor must have high centrifugal resistance.

[0005] In particular, a mold resin tube carrying a commutator piece on its outer periphery must hold the commutator piece against its centrifugal force, and furthermore, it generates resistance heat of the commutator piece and frictional heat generated by the brush. Because it is affected, a large thermal and mechanical load is applied. In the surface-type commutator, the surface-type commutator is arranged from the end face of the armature core through the coil end accommodating space of the armature coil in order to bend the armature coil at a required pitch, and a brush is further laterally disposed outside the commutator. However, there is a problem that the axial length, size and weight of the motor increase. In addition, there is a problem that the high-speed rotation of the motor is limited by the centrifugal force applied to the coil end.

On the other hand, since the commutator piece disclosed in the above-mentioned publication has a large-diameter riser portion, the centrifugal force of the commutator piece proportional to the square of the radius is increased remarkably, and the mold resin cylinder supporting the commutator piece has a large diameter. This involves a problem that the load is large and the motor cannot be rotated at high speed. Further, both the commutator piece, that is, both the brush contact portion and the inner conductor, must be carried in the mold resin cylinder in two stages in the radial direction, so that the burden on the mold resin cylinder is more severe than in the conventional case. Further, since the frictional heat generated in the brush contact portion due to friction with the brush needs to be transmitted to both riser portions, the temperature of the molded resin cylinder supporting the brush contact portion and the inner axial conductor becomes considerably high. Furthermore, since the inner conductor must be inclined in the circumferential direction, there is a problem that the axial length of the molded resin cylinder cannot be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an armature of a commutator type rotating electric machine having a commutator structure capable of remarkably rotating at high speed and reducing the size and weight. The purpose is.

[0008]

An armature of a commutator-type rotary electric machine according to the present invention comprises an armature coil disposed at a radially outer end of an armature core, and a brush-side end face of the armature core. A first armature coil holding portion extending along, and a second armature coil holding portion extending along the end surface of the armature core on the side opposite to the brush, the armature coil and The first armature coil holding portion and the second armature coil holding portion are integrally formed, and an outer end surface in the axial direction of the first armature coil holding portion forms a brush sliding surface. Conductor and
A third armature coil holding portion disposed between the armature core and the outer conductor and connected to a radially inner end of the first armature coil holding portion; An inner conductor having a fourth armature coil holding portion connected to a radially inner end of the armature coil holding portion; and an insulator electrically insulating the inner conductor from the armature core and the outer conductor. The insulator forms the first armature coil holding portion and a gap between the holding pieces adjacent to each other, the gap forms a second armature coil holding portion and the gap between the holding pieces adjacent to each other, The gap between the holding pieces that form the third armature coil holding section and is adjacent to each other, and the gap between the holding pieces that form the fourth armature coil holding section and are adjacent to each other, Separation wall part that protrudes in the axial direction of the child It is characterized by comprising an insulator having.

In a preferred first aspect, the radially inner end of the first armature coil holding portion and the radially inner end of the second armature coil holding portion are fixed to the armature rotating shaft. And an insulator having a locking collar. . In a preferred second aspect, the present invention is used for an internal combustion engine-starting electric motor having a speed reduction mechanism therein, and the center of gravity of the outer conductor, the inner conductor, the insulator, and the armature core is the axis of the rotating shaft of the armature. And the insulator interposed between the armature core slot in which the armature coil is disposed and the armature coil is formed before the armature coil is inserted into the inner conductor slot.

[0010]

According to the present invention, since the coil end can be omitted, the high-speed rotation is not restricted by the centrifugal resistance, and the axial length, size and weight of the motor can be reduced. Further, unlike the conventional case, it is not necessary to carry the first armature coil holding portion from the surface portion of the molded resin cylinder, and the molded resin cylinder itself is not required. Thereby, the high-speed rotation and the high output are not restricted, and the axial length, the physique, and the weight of the motor can be reduced by the omission of the molded resin tube. In addition, the frictional heat generated by the brush is generated in the first armature coil holder, which is well cooled by the airflow generated in the centrifugal direction along the surface. The commutator does not limit the heat-resistant temperature of the motor because it can be temporarily absorbed well by the armature core having a large heat capacity.

Furthermore, since the outer conductor is integrally formed, the contact resistance between the first armature coil holding portion and the second armature coil holding portion and the armature coil is reduced. , As well as enabling high-speed rotation of rotating electrical machines,
Significantly improves ease of assembly to armature core. In addition, in the circumferential gap between each armature coil holding portion, there is an axial gap between each armature coil holding portion or an insulation provided between the armature coil holding portion and the end face of the armature core. The holding piece separating wall protruding due to the deformation of the body is fitted.

With this structure, the circumferential gap between the armature coil holding portions is electrically insulated by a simple process of simply pressing the armature coil holding portions in the axial compression direction, and the armature coil holding portions are electrically insulated. The displacement of the coil holding portion in the circumferential direction can be prevented, and the resin molding step can be omitted. According to the first aspect, the radial inner ends of the two types of armature coil holding portions and the radial inner ends of the second armature coil holding portions which are adjacent to each other with the insulator interposed between the rotary shaft and the collar. Since the armature coil is locked, the armature coil can be locked easily and firmly.

According to the second aspect, since the insulator is formed before the armature coil is inserted into the inner conductor slot, the operation of armature balancing can be omitted.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 is an axial sectional view of a commutator type rotating electric machine showing an embodiment of the present invention, and FIG. 10 is an enlarged axial sectional view of a commutator portion thereof. An armature core 11 formed by laminating a plurality of disk-shaped steel plates 15 at a substantially central portion of the rotating shaft 10.
A plurality of slots 13 are formed on the outer peripheral surface of the armature core 11, and armature coils 20e and 21e, which are also simply called conductors, are fitted in the upper and lower two stages. This 20e constitutes a part of the outer conductor 20,
21e constitutes a part of the inner conductor 21.

A commutator section 40 described later is formed on the right end face of the armature core 11, and an anti-commutator section 90 described later is formed on the left end face to constitute an armature (rotor) of the motor. ing. Both ends of the rotating shaft 10 are connected to the end frame 6 of the electric motor.
0 and a bearing 62 attached to a member (not shown).
Is shielding the opening of the yoke 70 made of a cylindrical steel plate. A magnetic pole core 51 on which a field coil 50 is wound is provided on the inner peripheral surface of the yoke 70 so as to be close to the periphery of the armature core 4.
The yoke 70, the field coil 50, and the magnetic pole core 51 constitute a stator. Reference numeral 12 denotes a gear provided on the rotating shaft 10, which meshes with a gear of a not-shown reduction mechanism (for example, a planetary gear reduction mechanism), and transmits the rotation of the rotating shaft 10 to the not-shown gear.

A brush holder 80 is provided on the end frame 60.
Is fixed, and a brush 81 is held inside thereof so as to be slidable in the axial direction. The brush 81 is pressed against a first armature coil holding portion 20b of the commutator portion 40 described later by a spring 82 provided in the brush holder 80. Next, the commutator section 40 and the anti-commutator section 9
0, the armature coil 20e and the armature coil 21e will be described in further detail.

An insulating material 21 is provided on the right end face of the armature core 11.
The first armature coil holding portion 20b is arranged on the surface of the third armature coil holding portion 21b with the insulating material 20a interposed therebetween. Further, a fourth armature coil holding portion 21d is arranged on the left end face with the insulating material 21c interposed therebetween, and a second armature coil holding portion 20d is arranged on the surface with the insulating material 20c interposed therebetween. Insulation material 21
a, the third armature coil holding portion 21b, the insulating material 20a, and the first armature coil holding portion 20b constitute a commutator portion (brush side) 40, and the insulating material 21c, the fourth armature coil The holding part 21d, the insulating material 20c, and the second armature coil holding part 20d constitute an anti-commutator part (anti-brush part) 90.

The conductor 20e and the first armature coil holding portion 2
0b and the second armature coil holding portion 20d are integrally formed of a material such as copper by cold forging or the like to form the outer conductor 20. The conductor 21e, the third armature coil holding portion 21b, and the fourth armature coil holding portion 21d are integrally formed of a material such as copper by cold forging or the like to form the inner conductor 21.

FIG. 2 shows the armature coil holding part 2 on the commutator side.
The arrangement state of the peripheral portions of 0b and 21b is shown. (B) is a front view in the axial front view, and (a) is a partially enlarged plan view thereof. As described above, the insulating materials 20a and 21a are interposed between the armature coil holding portions 20b and 21b and between the armature coil holding portion 21b and the armature core 11, respectively. Further, the insulating members 20a, 21a are formed by a curved elongated groove-shaped gap 20f between the commutator pieces (armature coil holding portions) 20b, 20b adjacent in the circumferential direction, and adjacent holding pieces (armature coil holding portions) 21b, The holding piece separating walls 20r, 20s, and 21r protrude into a curved long groove groove-like gap 21f between the grooves 21b. The amount of protrusion of the holding piece separating wall portion 20r is less than the axial thickness of the armature coil holding portion 20b, and when the gap 20f is viewed from the armature radial direction (see FIG. 2A), the holding piece separating wall portion A space 20t is formed on the distal end side of the portion 20r, and the space 2t is formed.
0t is the undercut of the commutator.

The armature coil holding portion 20d on the anti-commutator side,
21d and the insulating members 20c and 21c also have the same shape and arrangement as the armature coil holding portions 20b and 21b and the insulating members 20a and 21a of the commutator portion, and the space corresponding to the space 20t in the anti-commutator portion is Acts as a fan that generates centrifugal airflow when the armature rotates. Further, as shown in FIGS. 1 and 10, the armature coil holding portions 20b, 21b, 20
Projections 20 g, 21 g, 20 h, 21 h projecting in the opposite direction to the armature core 11 are provided at the inner diameter ends of d, 21 d. That is, 20b to 20g are converted to 21b
To 21g, 20d to 20h, 21d to 21h
Project in the axial direction. On the outer periphery of the projection 20g,
A collar 30 fixed to the rotating shaft 10 is in contact with an insulating member 32. Similarly, a collar 31 fixed to the rotating shaft 10 is in contact with an outer peripheral portion of the protruding portion 20h via an insulating member 33.

The collar 30 is a commutator fixing member made of a soft metal such as aluminum. As shown in FIG. 10, an inner cylindrical portion 30a fitted to the rotating shaft 10 and a base end of the inner cylindrical portion 30a are provided. Plate portion 30b extending in the radial direction from the portion, and plate portion 3
0b extending from the outer diameter end toward the armature core 11, and the inner diameter end of the wheel plate portion 30b is
It has a bulging portion 30d that fits into the 0 annular groove 10a. The collar 31 has the same structure as the collar 30.

The insulating member 32 is also provided on the inner cylindrical portion 30 of the collar 30.
a, the inner cylindrical portion in contact with the outer peripheral surface of the
b has an annular plate portion in contact with the surface on the armature core 11 side and an outer cylinder portion of the outer cylinder portion 30c in contact with the inner peripheral surface on the armature core 11 side, and the insulating member 32 has protrusions 20g and 21g. Color 3
It is electrically insulated from zero. The insulating member 33 has the same structure as the insulating member 32.

Next, a method of assembling the armature coil according to the present embodiment will be described. An insulating film or an insulating sheet is previously applied to the surface of the conductor 20e by coating, baking, winding, bonding, or the like. Also, the conductor 20e is previously placed on the surface of the conductor 21e.
An insulating film or an insulating material sheet is applied in the same manner as described above. First, the conductor 21e and the conductor 20e are inserted into the slot 13 of the armature core 11 in this order. At this time, the flat washer-shaped insulating material 20a, armature coil holding portion 20b, insulating material 21a, and armature coil holding portion 21b on the right side of the armature core 11 are arranged as described above. After the insertion of the conductors 20e and 21e into all the slots 13, the projections 20
g and 21g are connected by a method such as welding, and both projecting portions 20h and 21h are connected by a method such as welding.

After the connection is completed, the outer armature coil holding portion 2
0b and 20d are pressed in the axial direction toward the armature, respectively.
By applying a compressive force, the insulating materials 20a, 20c, 21a,
21c, the insulating materials 20a, 20c, 21a,
21c is a protruding portion, that is, a holding piece separating wall portion 20r shown in FIG.
20s and 21r are formed on the commutator side and the anti-commutator side, respectively. Further, at this time, if the insulating materials 21a and 21c partially protrude into the slots 13 of the armature core 11,
The insulation between the conductor and the iron core can be made stronger.

Therefore, as the insulating members 21a and 21c, an electric insulating resin material which is deformed by receiving an appropriate compressive force is preferable. At the same time, the collars 30 and 31 and the insulating members 32 and 33 are fitted from the left and right directions in FIG.
And the collar 31 and the protruding portions 20h and 21h are assembled so as to contact via the insulating member 33. Due to this fitting input, the collars 30 and 31 are plastically deformed and the bulging portions 3 are formed.
0d protrudes into the annular groove 10a to regulate the displacement of the collars 30, 31.

Further, when the assembled collars 31, 32 are pressed and compressed toward the iron core in the armature axial direction, the two conductors 2
The holding portions 20b, 21b, 20d, 21d of 0, 21 are firmly pressed toward the iron core 11, and the insulators 20a, 21a,
0c and 21c are also firmly fixed. In addition, color 3
Due to the above pressing and compression of 0, 31, annular grooves 10a, 1a provided on the outer circumference of the rotating shaft 10 are formed in the inner diameters of the collars 31, 33.
The protrusions 30d and 31d corresponding to Ob are formed to be raised, and the collars 30 and 31 are more firmly fixed to the rotating shaft 10. If the tips of the inner cylindrical portions of the collars 30 and 31 are in contact with the iron core 11, the iron core 11 can be fixed to the rotating shaft via the collars 30 and 31.

After assembling the collars 30 and 31, the outer conductor 20
As described above, the collars 30 and 31 are engaged with the outer circumferences of the axially projecting portions 20g and 20h, respectively.
The lifting in the radial direction due to the centrifugal force during rotation of the armature 1 is prevented. FIG. 3 shows an armature coil (conductor) 20 of the present invention.
e, 21e and armature coil holders 20b, 21b, 20
d, 21d shows an electrical connection diagram of one embodiment.

In FIG. 3, the solid line represents the outer conductor 20, and the broken line represents the inner conductor 21. Although the embodiment employs a single-wave winding connection, the present invention is of course applicable to various other winding types such as a lap winding. Here, Yb in the figure is a back pitch consisting of a pitch between the armature coil of the upper conductor and the armature coil of the lower conductor connected on the anti-commutator section 90 side. Yf is a front pitch composed of a pitch between the armature coil of the upper conductor and the armature coil of the lower conductor connected on the commutator section 40 side.

As shown in FIG. 3, in the conventional motor, the connection wiring between the conductors in the slot of the armature coil performed at the coil end of the armature coil is the third wiring of the inner conductor 21 in the above-described embodiment. It is replaced by the substantially spiral curve of the armature coil holding portion 21b and the first armature coil holding portion 20b of the outer conductor 20. Of course, as shown in FIG. 4, both spiral directions are opposite. More specifically, the outer ends of the first armature coil holding portion 20b and the third armature coil holding portion 21b whose radial inner ends are connected to each other are shifted in the circumferential direction by one front pitch. Become. For this reason, in this embodiment, the third armature coil holding portion 21b and the first armature coil holding portion 20b are each curved by approximately 1/2 front pitch, but the curved or bent shape can be freely designed. However, the first armature coil holding portion 10b may be radially arranged, and the third armature coil holding portion 21b may be greatly curved.

As is apparent from the above description, according to the present embodiment, since the coil end of the armature coil is converted to the third armature coil holding portion 21b of the inner conductor 21, the axial length of the armature is changed. Therefore, the motor size and weight can be reduced in size and weight. Further, the resin-based insulating materials 21a, 2
Since centrifugal force acts in a parallel direction on the contact interface between Oa and the third armature coil holding portion 21b and the first armature coil holding portion 20b, the centrifugal force resistance performance of the commutator portion 40 can be improved. Further, the sliding contact area with the brush 81 can be realized without increasing the physique. Furthermore, the resistance heat and frictional heat generated in the first commutator coil holding portion 20b are well cooled by the inevitably generated centrifugal airflow, and are well absorbed by the large heat capacity armature core 11 through solid state heat transfer. It is suitable for a fully closed starter motor. In particular,
The effect is enormous when the speed is reduced by adopting the speed reduction mechanism.

According to the test results of the present inventors, 1.4K
As a result of performing a comparative test with a conventional product using a W, 30-second rated motor and the same brush contact area, the conventional product had a temperature difference of 50 ° C. between the armature core and the commutator portion. The temperature of the product of the present invention was 15 ° C. Further, the outer conductor 2
0 is the armature coil 20e and the first armature coil holding portion 2
0b and the second armature coil holding portion 20d, the contact resistance between the first armature coil holding portion 20b, the second armature coil holding portion 20d, and the armature coil 20e is reduced. As a result, the rotating electric machine can be rotated at a high speed, and the assembling property to the armature core 11 is greatly improved.

In addition, according to this embodiment, all parts except the rotating shaft 10 can be produced by press / cold forging with high productivity. In addition, the entire armature is processed only by pressing and welding. In particular, conventionally, a large amount of processing time was required. In the present embodiment, the cutting for forming the undercut between the commutator pieces can be omitted because the undercut portion is formed at the same time when the armature coil 20 is assembled. In addition, in the present embodiment, the molding of the conventional commutator, which is troublesome, is also performed in the armature coil holding portion 2.
0b, 20d are pressed toward the armature core 11, and the insulating materials 20a, 20c disposed inside the holding portions 20b, 20d.
To the armature coil holding portions 20b, 20
This can be replaced by partially protruding into the streak-like gap 20f between b and the streak-like gap between the circumferentially adjacent armature coil holding portions 20d, 20d.

Further, in the conventional armature, it is necessary to lock the armature coil in the armature core slot, and a process such as impregnation of resin into the slot is required. , 21 are projections 20g of the inner diameter part,
The armature coil can be firmly locked to the armature core by a very simple method of locking the collars 30 and 31 to 21g, 20h and 21h, and the resin impregnation can be omitted.

As described above, the productivity of the armature of this embodiment is significantly higher than that of the prior art. The heat resistance of the armature coil and the commutator locking portion of the present embodiment is such that the locking portions are the collars 30 and 31 as described above, and 30 and 31 are metal members. The lowering of strength at high temperatures is smaller than that of the locking method in which the locking member is a resin, such as a child coil lock and a commutator lock made of commutator molded resin. -The centrifugal strength is significantly improved.

The case where the present embodiment is applied to a starter with a speed reducer in which a speed reduction mechanism meshes with the gear 12 will be described. Since the armature of a starter with a speed reduction mechanism usually rotates at a very high speed of tens of thousands of rpm, it is necessary to adjust the rotation unbalance of the armature to an extremely small one. After the completion of armature assembly, part of the outer periphery of the iron core is removed or weights are added after the completion of armature assembly due to variations in the impregnation amount of each slot and uneven thickness of the mold resin of the commutator. Although the rotation balancing operation is indispensable, in this embodiment, the resin impregnation in the slot and the molding of the commutator are not required, and therefore, the armature balancing operation can be omitted.

As described above, the armature according to the present invention has a mechanical advantage that the axial dimensions of the coil end portion and the commutator portion can be greatly reduced, a high centrifugal strength enables high rotation operation, and a thermal advantage. Since the heat generation is suppressed in spite of the small size, if it is used for a starter with a speed reduction mechanism, an excellent effect that the motor part can be made very small by increasing the reduction ratio and the whole starter can be made small. is there.

Insulating materials 20a, 21a, 20c, 21c
Is formed of an insulating material having appropriate plasticity such as paper, a resin sheet, and the like, and insulating materials 20a, 21a, 20c,
After using an insulator such as a semi-solid epoxy resin as the material 21c and assembling a conductor to form the projections 20r, 20s, 21r, etc., a solidification treatment such as heating may be performed.
Further, in the above-described embodiment, the insulating materials 20a, 21a, 20
After the conductors are assembled, the bulging portions 20r, 20s, 21r of the armature coil holding portions 20b, 21b, 20d, 2c
1d is pressed, but the bulging portion 2 is formed in advance.
0r, 20s, and 21r are insulating materials 20a, 21a, and 20r.
It may be formed on each of c and 21c. In this case, a resin material having excellent insulation properties and strength, such as phenol resin, can be used as the insulating materials 20a, 21a, 20c, 21c.

In the above-described embodiment, the collars 30 and 31 have the inner diameter portions projected and engaged with the grooves 10a and 10b on the outer peripheral portion of the rotary shaft 10, respectively. . Further, when the armature core 11 is press-fitted into the rotating shaft 10 for fixing, the collars 30 and 31 do not necessarily have to abut on the armature core 11.

Further, in the above embodiment, the colors 30, 3
Since 1 is made of metal such as aluminum, the insulating members 32, 3
3, the collars 30 and 31 are provided with an insulating coating, the collars 30 and 31 are formed from an insulating material, and the protrusions 20g and 21g are insulated.
Insulation between the g and 21g and the collar 30 may be ensured. In this case, the insulating members 32 and 33 may be omitted.

In the above embodiment, the slot 13 of the armature core 11 has an open slot shape whose outer diameter side is open.
A closed slot or a semi-closed slot can be formed by, for example, knocking down a claw provided around the slot outer diameter side opening after insertion. In this case, the armature coil section 2
Since 0e and 21e are locked to the outer edge portion of the slot 13, for example, the claw-down portion, the centrifugal resistance performance of the armature is further improved.

FIG. 5 shows an embodiment of this semi-closed slot. In the drawing, what is indicated by a two-dot chain line is a state before assembling, and after assembling, a semi-closed slot is formed by tilting the claw portion 13a toward the slot side. If the armature coil holding portions 20b and 20d are pressed in the axial direction during assembly, the coil portions 20e and 21e may be bent. However, if the conductors 20e are pressed simultaneously in the radial direction at the time of pressing, the above-described bending may occur. Can be prevented.

In the above-described embodiment, the outer conductor 20 and the inner conductor 21 are integrally formed together with the outer conductor 20 and the inner conductor 21 by cold forging with a material such as copper.
May be pressed as a copper plate. In this case, the outer conductor 2
0, the manufacturing cost of the inner conductor 21 can be greatly reduced. FIG. 7 is a roll-up state diagram of the outer conductor 20 and the inner conductor 21 of FIG. 6 before bending, and the outer conductor 20 and the inner conductor 21 formed by progressive cutting from a strip-shaped copper plate are referred to as 20i and 21.
j, 20k and 20l are bent as folding lines, and a part 20m to be mounted in the slot 13 of the armature core 11 is shown in FIG.
As shown in FIG. 6, the central portion is closely adhered to bend to form the conductor shape shown in FIG.

As another method of forming the two conductors 20, 21, it is also possible to form the respective parts of the conductors separately, combine them, and then join them together. In FIG. 9, the outer conductor 20
This joining method will be described with reference to an example. Holder 20 for conductor 20
b, 20d and the coil portion 20e are separately formed, and are manufactured by pressing a copper plate. In the outer peripheral portions of the holding portions 20b and 20d, through holes or recesses 20p and 20q corresponding to the cross-sectional shape in the drive axis direction of 20e are provided. The outer conductor 20 is formed by engaging and integrating the tip of the coil portion 20e with the through holes or recesses 20p, 20q. This engagement and integration is performed by pressing 20e into 20p and 20q,
It is performed by welding, caulking, or a joining method in which these are appropriately combined. In FIG. 9, both ends of 20e are tapered, but may be wedge-shaped, stepped, or straight.

In the above embodiment, a winding field type DC motor has been described. However, the present invention is not limited to this, and a magnet field type DC motor which generates a field magnetic field by a permanent magnet, and further another AC Obviously, it can also be applied to a commutator motor.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of a commutator-type rotary electric machine showing one embodiment of the present invention.

FIG. 2A is an enlarged plan view in the axial direction of a main part of FIG. (B) is an axial front view of the armature coil on the commutator side in FIG. 1.

FIG. 3 is a partial wiring diagram of an inner conductor and an outer conductor of FIG. 1;

FIG. 4 is a schematic perspective view showing an arrangement state of an inner conductor and an outer conductor of FIG. 1;

FIG. 5 is a view illustrating an assembling of an outer conductor and an inner conductor to an armature core according to another embodiment.

FIG. 6 is a schematic perspective view showing an arrangement state of inner conductors and outer conductors showing another embodiment.

FIG. 7 is a roll-up view of the outer conductor of FIG. 6;

FIG. 8 is a sectional view taken along line AA of FIG. 7;

FIG. 9 is a perspective view showing another embodiment of the outer conductor.

FIG. 10 is an enlarged sectional view in the axial direction of a main part of FIG. 1;

[Explanation of symbols]

10 is a rotating shaft, 11 is an armature core, 20 is an inner conductor, 2
0e is the conductor of the armature coil (armature coil part), 20b
Is a third armature coil holding portion, 20d is a fourth armature coil holding portion, 21 is an outer conductor, 21e is an armature coil conductor (armature coil portion), and 21b is a first armature coil holding portion. , 21d are the second armature coil holders, 20a,
21a, 20c, 21c are insulating materials (insulators), 21r,
20s and 20r are holding piece separation walls, and 30 and 31 are collars.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-194541 (JP, A) JP-A-64-60246 (JP, A) JP-A-2-241346 (JP, A) 48371 (JP, U) Japanese Utility Model 50-109801 (JP, U) Japanese Utility Model 63-88069 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 13/04

Claims (3)

(57) [Claims] An armature coil disposed at a radially outer end of the armature core; a first armature coil holding portion extending along a brush-side end surface of the armature core; An armature core has a second armature coil holding portion extending along the end surface on the side opposite to the brush, and the armature coil, the first armature coil holding portion, and the second armature coil A holding part is integrally formed, an outer conductor in which an axial outer end face of the first armature coil holding part forms a brush sliding surface, and is disposed between the armature core and the outer conductor. A third armature coil holding portion connected to a radially inner end of the first armature coil holding portion, and a third armature coil connected to a radially inner end of the second armature coil holding portion. An inner conductor having a fourth armature coil holding portion, and the inner conductor being connected to the armature core and the outer An insulator that electrically insulates the body from the body, wherein the insulator forms the first armature coil holding portion, forms a gap between adjacent holding pieces, and forms the second armature coil holding portion. A gap between the holding pieces adjacent to each other, a gap between the holding pieces adjacent to each other that forms the third armature coil holding portion, and an adjacent space to form the fourth armature coil holding portion. An insulator having a holding piece separating wall protruding in the axial direction of the armature in a gap between the holding pieces. 2. A collar fixed to an armature rotating shaft to lock a radially inner end of the first armature coil holding portion and a radially inner end of the second armature coil holding portion. An armature for a commutator-type rotary electric machine according to claim 1. 3. An electric motor for starting an internal combustion engine having a speed reduction mechanism therein, wherein said outer conductor, inner conductor, insulator,
And the center of gravity of the armature core is located at the axis of the rotating shaft of the armature, and the insulator interposed between the armature core slot in which the armature coil is disposed and the armature coil is located inside the armature coil. The armature of a commutator-type rotating electric machine according to claim 1, wherein the armature is formed before insertion into the conductor slot.