JP6552340B2 - Commutator, cartridge for manufacturing commutator and motor with reduction gear - Google Patents

Description

  The present invention relates to a commutator, a cartridge for manufacturing a commutator, and a motor with a reduction gear.

  In general, a motor with a reduction gear reduces the rotational power generated by the rotation of an armature, a stator in which permanent magnets are arranged at regular intervals on the inner peripheral surface of a cylindrical yoke, an armature rotatably provided inside the stator, and And a speed reducing mechanism. The armature has an armature core fixed to the rotating shaft and a commutator fixed to the rotating shaft so as to be adjacent to the armature core. The armature core includes a plurality of teeth extending along a radial direction, and a winding is wound around the teeth.

  The commutator mainly includes a resin commutator main body externally fitted and fixed to the rotation shaft, and a plurality of conductive segments disposed at intervals on the sliding surface of the commutator main body. A riser is formed at one end of the segment, and the winding wound around the teeth is locked to the riser. Thereby, the winding and the segment are conducted.

  Further, a plurality of brushes for supplying current are slidably contacted with the segments, and the windings are energized through these brushes, segments, and risers. Then, a magnetic field is generated in each tooth. The rotating shaft is rotated by the magnetic attraction and repulsion generated between the magnetic force of the magnetic field and the permanent magnet. Here, it is necessary to supply a plurality of different phase currents to the windings wound around the teeth in order to continuously rotate the rotation shaft. To this end, the segments are spaced apart so as to isolate each other.

  By the way, there is a case where a pressure equalizing line for short-circuiting segments having the same potential among the segments arranged in the commutator is wound around the commutator. By comprising in this way, an electric current can be supplied also to the segment which the brush is not slidably contacting, and it becomes possible to reduce the installation number of a brush.

JP 2012-223048 A

However, in the above-mentioned prior art, in order to form a pressure equalizing line with a winding, the process of winding operation takes time, and there existed a problem that manufacturing time increases.
In addition, in order to ensure the electrical connection between the voltage equalizing line and the segment having the same potential, on the other hand, in order to ensure the insulation from the voltage equalizing line connected to the segment having a different potential, the winding machine is provided near the riser. The operation becomes complicated. Therefore, there is a problem that the management process becomes complicated. Furthermore, there has been a problem that the manufacturing cost increases due to an increase in the amount of copper which is a raw material of the pressure equalizing wire.

  Therefore, the present invention has been made in view of the above-described circumstances, and simplifies the manufacturing process and the control process, and can reduce the manufacturing cost, and manufacture the commutator, the cartridge for manufacturing the commutator, and the motor with the reduction gear. It provides a method.

In order to solve the above-described problems, a commutator according to the present invention includes a segment member assembly formed in a cylindrical shape by combining a plurality of conductive segment members, and a resin inside the segment member assembly. The segment member is formed on a plurality of segment portions constituting an outer peripheral sliding surface of the commutator body, and an inner circumferential surface of each of the segment portions. an anchor that is, anda equalizing portion connecting the segment portions to the same potential among the plurality of segment portions, each of said equalizing section, radially inward of the homogeneous pressure curve portion wherein the rotation axis can be arranged through-hole is formed and the inner diameter of each of the through holes are different sizes, so that on the end portion flush with the axial end of said rotary shaft in said segment portion Will by being bent radially inward, and each of said equalizing section, stepwise so that each as it goes from the outer side in the radial direction inward in the radial direction becomes a position different in the axial and radial The axial lengths of the rotating shafts in the segment portions having different potentials among the plurality of segment members are set to different lengths.

  With this configuration, it is possible to eliminate the work of winding the equalizing wire, shortening the manufacturing time, simplifying the operation of the winding machine, and simplifying the management process, thereby reducing the manufacturing cost of the commutator. Can be suppressed. Further, since the load at the time of anchor cutting on the inner surface side of the segment is received by the entire pressure equalizing line portion which becomes the end face, deformation of the member hardly occurs and the anchor cutting process becomes easy, and further shortening of the anchor press life is suppressed. it can. In addition, since the axial lengths of the segment portions are different from each other, the segment members can be combined only in the prescribed order, and erroneous assembly can be prevented. In addition, the pressure equalizing line part is arranged on the end face side of the commutator body and is formed on the same plane as the axial end part of the segment member, so that no member extending in the axial direction is required, and material costs can be reduced. Can do. In addition, since the plurality of segment parts are combined in a tubular shape, slit processing of the segment parts is unnecessary, and the cost can be reduced.

  In the commutator according to the present invention, the pressure equalizing line portion may be formed in a C shape.

With this configuration, the notched portion becomes a resin flow path that is dissolved during resin molding, so that the resin is sufficiently spread and molding defects such as short shots can be suppressed.
In the commutator according to the present invention, in the pressure equalizing line portion, a part of the surface on the inner diameter side of the pressure equalizing line portion may be exposed from the resin.

In commutator according to the present invention, before KiHitoshi pressure line section may be arranged in concentric circles at intervals from each other.

  By comprising in this way, the insulation of pressure equalizing wire parts can be ensured and a short circuit can be prevented. In addition, since the resin enters between the pressure equalizing line portions, the adhesion between the segment member and the commutator main body can be enhanced. Further, by assembling the cartridge to the commutator manufacturing cartridge having the columnar stepped portion whose diameter gradually increases from the upper stage to the lower stage, positioning at the time of assembly and erroneous assembly can be prevented.

  A motor with a reduction gear according to the present invention comprises a segment member assembly formed into a cylindrical shape by combining a plurality of conductive segment members, and a resin molded in the interior of the segment member assembly, which has a rotary shaft. A commutator body that is externally fitted and fixed, and the segment member includes a plurality of segment portions that constitute an outer peripheral sliding surface of the commutator main body, an anchor formed on an inner peripheral surface of each segment portion, and a plurality of segments And the pressure equalizing line portion connecting the segment portions having the same potential among the segment portions, and the pressure equalizing line portion extends from an axial end portion of the rotation shaft in the segment portion to the end portion It is bent inward in the radial direction so as to be on the same plane, and the axial length of the rotation axis in the segment portions of different potentials among the plurality of segment members is And wherein the mounting the commutator, characterized in that Re is set to respectively different lengths.

  With this configuration, it is possible to provide a motor with a speed reducer equipped with a commutator capable of simplifying the manufacturing process and the management process and suppressing the manufacturing cost.

  The commutator manufacturing cartridge according to the present invention is formed to have a bottomed cylindrical cartridge main body that holds the segment member assembly in a cylindrical shape, and a plurality of step portions on the bottom surface of the cartridge main body. And a stepped portion on which the pressure equalizing line portion is placed on each stepped portion.

  With this configuration, it is possible to provide a commutator manufacturing cartridge for a commutator capable of simplifying the manufacturing process and the management process and suppressing the manufacturing cost. Further, when the plurality of segment members are stacked and set in the cartridge, positioning in the radial direction, axial direction and circumferential direction of each segment member can be performed. Further, since the pressure equalizing line portion is supported by the surface of the stepped portion, it is possible to prevent the pressure equalizing line portions from coming into contact with each other and shorting due to the resin pressure. In addition, since resin does not flow from the inner diameter side between the pressure-equalizing portions and only from the outer diameter side, the resin does not flow from both sides, preventing mold cracking due to air bubbles in the commutator body. Can do.

  In the commutator manufacturing cartridge according to the present invention, the height of the stepped portion of the stepped portion is set such that the height of the opening side end of the cartridge body in each segment portion is the same height. Also good.

With such a configuration, it is possible to suppress the axial length of the commutator while disposing the pressure equalizing portions at intervals in the axial direction.

  In the cartridge for manufacturing a commutator according to the present invention, a round chamfer may be formed at a corner of the stepped portion.

By this configuration, the resin can be sufficiently flowed into the space secured by the round chamfered portion without the corner portion blocking the resin flow path.

  In the cartridge for manufacturing a commutator according to the present invention, on the inner peripheral surface of the cartridge main body, convex ridges for positioning the plurality of segments in the circumferential direction and holding the plurality of segments are formed. Also good.

  With such a configuration, the projection can be assembled so as to be positioned between the adjacent segment parts, and the jig for positioning becomes unnecessary. In addition, it is possible to prevent the resin from flowing out to the sliding surface side of the segment portion from between the adjacent segment portions by the ridges.

  According to the present invention, the winding operation of the equalizing wire can be eliminated, thereby shortening the manufacturing time, simplifying the operation of the winding machine, and simplifying the management process, thereby reducing the manufacturing cost of the commutator. Can do.

It is a partial cross section showing composition of a motor with a reduction gear in an embodiment of the present invention. It is a perspective view showing composition of an armature in an embodiment of the present invention. It is the perspective view which looked at the commutator in the embodiment of the present invention from the worm gear reducer side. It is a sectional view of a segment member assembly in an embodiment of the present invention. The segment member assembly body in embodiment of this invention is shown, (A) is a perspective view of a 1st segment member, (B) is a perspective view of a 2nd segment member, (C) is a perspective view of a 3rd segment member. It is. It is a side view of the 3rd segment member in an embodiment of the present invention. It is the top view which looked at the segment member assembly in the embodiment of the present invention from the armature core side. It is an expanded view of an armature in an embodiment of the present invention. It is a perspective view of the cartridge for the commutator manufacture in the embodiment of the present invention. It is the top view which looked at the cartridge for the commutator manufacture in the embodiment of the present invention from the opening side. It is a cross-sectional perspective view of the cartridge for a commutator manufacture in embodiment of this invention, and a 3rd segment member. It is a section perspective view of the cartridge for commutator manufacture in a metallic mold and the segment member assembly in the embodiment of the present invention. It is a partially expanded sectional view of the cartridge for a commutator manufacture and the segment member assembly in embodiment of this invention. It is a cross-sectional perspective view of a cartridge for manufacturing a commutator and a commutator in an embodiment of the present invention. It is a partially expanded sectional view of a cartridge for manufacturing a commutator and a commutator in an embodiment of the present invention. It is sectional drawing of the commutator in embodiment of this invention.

  Next, embodiments of the present invention will be described with reference to the drawings.

(Motor with reduction gear)
FIG. 1 is a partial sectional view showing the configuration of a motor 1 with a reduction gear according to an embodiment of the present invention.
As shown in the figure, the motor 1 with a reduction gear serves as a drive source of, for example, electric components (for example, a wiper, a power window, a sunroof, an electric seat, etc.) mounted on a vehicle. And a worm gear reducer 4 connected to the rotating shaft 3 of the DC motor 2.

(DC motor)
In the DC motor 2, an armature 6 (not shown in FIG. 1) is rotatably disposed in a bottomed cylindrical yoke 5. Six tile-shaped permanent magnets (not shown) divided in the circumferential direction are fixed to the inner peripheral surface of the yoke 5 at equal intervals. These permanent magnets are formed using rare earth magnets such as neodymium sintered magnets.

(Worm gear reducer)
The worm gear reducer 4 is connected to the worm 8 housed in the gear housing 7 in addition to the gear housing 7, the worm wheel 9 meshing with the worm 8, and the output connected to the worm wheel 9 to output rotational power. Plate 11. The worm 8 is formed on the rotating shaft 3 supported on the inner wall of the bearing 10 and the gear housing 7 and integrally rotates with the rotation of the DC motor 2. The output plate 11 is driven by the rotational power transmitted from the worm 8 to the worm wheel 9.

(Armature)
FIG. 2 is a perspective view showing the configuration of the armature 6 according to the embodiment of the present invention.
As shown in the figure, the armature 6 includes an armature core 12 fixed to the rotating shaft 3, an armature coil 13 wound around the armature core 12, and an outer fitting on the rotating shaft 3 on the bearing 10 side from the armature core 12. The commutator 14 is fixed. The armature core 12 is formed, for example, by stacking a plurality of metal plates 15 in the axial direction.

  On the outer peripheral portion of the metal plate 15, nine T-shaped teeth 16 are radially formed at equal intervals along the circumferential direction. By fitting and fixing a plurality of metal plates 15 to the rotary shaft 3 from the outside, a dovetail slot (not shown) is formed between adjacent teeth 16 on the outer periphery of the armature core 12. The slots extend along the axial direction, and nine slots are formed at equal intervals along the circumferential direction.

  Then, an enamel-coated winding 24 (not shown) is wound around each tooth 16. As a result, a plurality of armature coils 13 are formed on the outer periphery of the armature core 12. Further, the winding wire 24 is also locked to the riser 18 provided at one end of the nine segments 17 arranged on the outer peripheral surface of the commutator 14 on the armature core 12 side after being wound around the teeth 16. That is, the direct current motor 2 has a so-called 6-pole 9-slot 9-segment 3-phase (U-phase, V-phase, 6-pole, 9-slot, and 9-segment 9 segments). W phase) motor.

(Commutator)
Next, the commutator 14 will be described with reference to FIG.
As shown in the figure, the commutator 14 includes a commutator main body 19 made of a cylindrical resin and a conductive segment member assembly 22 embedded in the commutator main body 19.
A segment 17 is provided on the outer peripheral sliding surface of the commutator body 19. The segment 17 is configured by arranging a plurality of segment portions 31 provided in the segment member assembly 22 (details will be described later) in a tubular shape at equal intervals. In other words, the commutator body 19 is formed of resin inside the segment member assembly 22. In FIG. 3, since most of the segment member assembly 22 is covered with the resin of the commutator body 19, the riser 18, the segment 17, and a part of the pressure equalizing portion 26 are illustrated.
A through hole 20 into which the rotary shaft 3 can be press-fitted is formed at the radial center of the commutator body 19.

  At substantially the center in the circumferential direction of each segment portion 31 on the armature core 12 side, a riser 18 bent so as to be folded back to the outer diameter side is integrally formed. The riser 18 is for locking the winding 24. The winding 24 is wound around the armature coil 13, is extended toward the commutator 14, and is locked to the riser 18. Then, by fixing the riser 18 to which the winding 24 is locked by fusing, the segment portion 31 and the corresponding armature coil 13 are electrically conducted.

  The plate member of the segment member 21 is formed so that the circumferential dimension narrows as the portion corresponding to the riser 18 extends toward the armature core 12 side. The plate member of the segment member 21 is formed so as to elongate in an elongated manner while maintaining a constant width from the point where the circumferential dimension is narrowed to a fixed width. As a result, in the entire segment 17, substantially semicircular recesses are formed between the risers 18 adjacent in the circumferential direction at the end on the riser 18 side. By the plate material having such a shape, the bending process can be facilitated and the amount of the winding 24 to be wound can be reduced.

The riser 18 which is elongated and maintains a certain width, is once bent to the outer diameter side, and is further folded back to the opposite side to the armature core 12 along the axial direction to be formed in a substantially U shape.
That is, the riser 18 includes a riser winding locking surface 18b extending radially outward from the riser base end 18a of the riser 18, a riser winding separation preventing surface 18c extending axially from the riser winding locking surface 18b, And a riser end face 18d facing in a direction orthogonal to the direction.

  A riser corner 18f is formed at the connection between the riser winding locking surface 18b and the riser winding separation preventing surface 18c. Therefore, the winding 24 is detached by securely engaging the riser winding separation preventing surface 18c extending in the direction opposite to the direction of the armature coil 13 in which the winding 24 is extended and the riser corner portion 18f. Is suppressed.

  Also, the tip of the riser 18 having the riser end face 18d maintains a constant size without being tapered toward the end. Therefore, the winding 24 is not loosened and easily detached from the riser 18 by being narrowed toward the end, and the winding 24 can be reliably locked.

(Segment assembly)
Next, the commutator 14 will be described based on FIGS. 4 to 6.
FIG. 4 is a cross-sectional view of the segment member assembly 22 along the axial direction. FIG. 5 shows the segment member assembly 22, (A) is a perspective view of the first segment member 21a, (B) is a perspective view of the second segment member 21b, and (C) is a third segment member It is a perspective view of 21c.
As shown in FIGS. 4 and 5, the segment member assembly 22 is configured by combining three conductive segment members 21 (see FIG. 5) manufactured by processing a copper plate material. Since the DC motor 2 is a so-called 6-pole 9-slot 9-segment three-phase motor, there are three segment portions 31 having the same potential per phase. For this reason, one segment member 21 is comprised by the three segment parts 31 which become the same electric potential, and the one pressure equalizing line part 26 which connects these three segment parts.

  Three V-shaped anchors 32 are formed on the inner peripheral surface of each segment portion 31 in contact with the commutator body 19 in the longitudinal direction. The anchor 32 is for increasing the fixing force between the segment 17 and the commutator main body 19 and preventing the peeling by the resin constituting the commutator main body 19 being bitten and cured at the time of molding.

The three segment members 21 are arranged at intervals from each other with their centers concentrically overlapped in the axial direction. Each segment member 21 has three segment portions 31, and a total of nine segment portions 31 are combined so as to constitute a cylindrical segment 17 as a whole.
In other words, the three segment members 21 shown in FIG. 5 are set to have mutually different dimensions so that the segment member assembly 22 shown in FIG. 4 can be configured by combining them. .

Hereinafter, based on FIG. 5 and FIG. 6, the above-mentioned three segment members 21 (the 1st segment member 21a, the 2nd segment member 21b, the 3rd segment member 21c) are explained.
As shown in FIG. 5 (A), the first segment member 21a is formed by punching a metal plate (not shown) by press working, and radially inward at a base end 33a which is an axial end of the rotary shaft 3. It is bent. And the 1st segment member 21a is shape | molded so that the pressure equalizing line part 26a may be arrange | positioned at the end surface side of the commutator main body 19, and may be located on the same plane as the base end part 33a.
Further, the first segment member 21a radially extends from the outer peripheral edge of the C-shaped equalizing line portion 26a in which a part of the annular ring is cut away and the equalizing line portion 26a, and the riser 18 is formed at the tip. And three first segment portions 31a.

A single V-groove-shaped first anchor 32a is formed at substantially the center in the circumferential direction of the inner peripheral surface of the first segment portion 31a. This V-groove-shaped first anchor 32a has a length X1 (hereinafter referred to as "length X1") from an anchor lower end 34a located above the base end 33a to an anchor upper end 35a located before the tip of the riser 18. Is formed over the
On both sides in the circumferential direction of the central first anchor 32a, the first anchor 32a extends from the anchor lower end 34a to the end of the segment portion 31a on the armature core 12 side in the same manner as the central first anchor 32a. It is formed one by one.

  The first pressure equalizing line portion 26a is bent from the segment portion 31a at the base end portion 33a, and the inner diameter E1 (hereinafter referred to as “inner diameter E1”) of the first pressure equalizing portion 26a is the shaft diameter of the rotary shaft 3. It is set to be larger than E0 (hereinafter referred to as “inner diameter E0”).

As shown in FIG. 5 (B), the second segment member 21b is formed by punching a metal plate (not shown) by press working radially inward at a base end 33b which is an axial end of the rotary shaft 3. It is bent. And the 2nd segment member 21b is shape | molded so that the pressure equalizing line part 26b may be arrange | positioned at the end surface side of the commutator main body 19, and may be located on the same plane as the base end part 33b.
Further, the second segment member 21b radially extends from the outer peripheral edge of the C-shaped equalizing line portion 26b in which a part of the annular ring is cut away and the equalizing line portion 26b, and the riser 18 is formed at the tip. And three segment parts 31b.

  The second segment portions 31 b are integrally formed so as to be arranged at equal intervals in the circumferential direction of the pressure equalizing portion 26 b. Here, the length L2 (hereinafter referred to as "length L2") from the proximal end 33b to the tip of the riser 18 is the length L1 (hereinafter referred to as "length 1" from the proximal end 33a of the first segment member 21a to the tip of the riser 18 It is set to be longer than “the length L1”.

A single V-groove-shaped second anchor 32b is formed at substantially the center in the circumferential direction of the inner peripheral surface of the second segment portion 31b. The V-shaped second anchor 32b has a length X2 (hereinafter referred to as "length X2") from an anchor lower end 34b located above the base end 33b to an anchor upper end 35b located before the tip of the riser 18. Is formed over the
On both sides of the central second anchor 32b in the circumferential direction, the second anchor 32b extends from the anchor lower end 34b to the end of the segment 31b on the armature core 12 side, similarly to the central second anchor 32b. It is formed one by one.

  Here, the length X2 (hereinafter referred to as “length X2”) from the anchor lower end portion 34b to the anchor upper end portion 35b is the same as the length X1 (hereinafter referred to as “length X1”) in the first segment portion 31a. It is set to be.

  The second pressure equalizing line portion 26b is bent at the base end portion 33b from the second segment portion 31b, and the inner diameter E2 (hereinafter referred to as “inner diameter E2”) of the second pressure equalizing portion 26b is the first segment member. It is set to be larger than the inner diameter E1 of the pressure equalizing line portion 26a of 21a.

FIG. 6 is a side view of the third segment member 21c.
As shown in FIG. 5C and FIG. 6, the third segment member 21c has a diameter at a base end 33c which is an end in the axial direction of the rotary shaft 3 by punching a metal plate (not shown) by press working. It is bent inward. And the 3rd segment member 21c is shape | molded so that the equalization line part 26c may be arrange | positioned at the end surface side of the commutator main body 19, and may be located on the same plane as the base end part 33c.
Further, the third segment member 21c radially extends from the outer peripheral edge of the C-shaped equalizing line portion 26c, in which a part of the annular ring is cut away, and the equalizing line portion 26c, and the riser 18 is formed at the tip. Three third segment portions 31c.
The third segment part 31c is integrally formed so as to be arranged at equal intervals in the circumferential direction of the pressure equalizing line part 26c. Here, the length L3 (hereinafter referred to as “length L3”) from the proximal end 33c to the tip of the riser 18 is greater than the length L2 from the proximal end 33b of the second segment member 21b to the tip of the riser 18 It is set to be long.

One V-groove-shaped third anchor 32c is formed at substantially the center in the circumferential direction of the inner peripheral surface of the third segment portion 31c. The V-shaped third anchor 32c has a length X3 (hereinafter referred to as "length X3") from an anchor lower end 34c located above the base end 33c to an anchor upper end 35c located before the tip of the riser 18. Is formed over the
On the both sides in the circumferential direction of the third anchor 32c in the center, there is a third anchor 32c extending from the anchor lower end 34c to the end of the segment 31c on the armature core 12 side in the same manner as the center third anchor 32c. Each line is formed. Here, the length X3 is set to be the same length as the length X2 in the second segment portion 31b.

  The third pressure equalizing line portion 26c is bent at the base end portion 33c from the third segment portion 31c, and the inner diameter E3 (hereinafter referred to as “inner diameter E3”) of the third pressure equalizing line portion 26c is the second segment. It is set to be larger than the inner diameter E2 of the pressure equalizing line portion 26b of the member 21b.

As described above, the first segment member 21a shown in FIG. 5 (A), the second segment member 21b shown in FIG. 5 (B), and the third segment member 21c shown in FIG. 5 (C) Thus, the segment member assembly 22 shown in FIG. 4 is configured. Here, in order to form the segment member assembly 22, each length L1, L2, L3 from the base end 33 of the segment 31 to the tip of the riser 18 is
L1 <L2 <L3 (1)
It is set to meet the

Similarly, the first segment member 21a shown in FIG. 5 (A), the second segment member 21b shown in FIG. 5 (B), and the third segment member 21c shown in FIG. 5 (C) In order to establish, the lengths X1, X2, and X3 from the anchor upper end 35 to the anchor lower end 34 are
X1 = X2 = X3 (2)
It is set to meet the

Here, as shown in the above-mentioned formula (1), the three segment members 21 have mutually different dimensions in the axial direction, so that the pressure equalizing line portions 26 are spaced from each other to ensure insulation. Yes.
Moreover, as shown in the said Formula (2), the three segment members 21 set the length from the anchor upper end part 35 to the anchor lower end part 34 to the same dimension, and as shown in FIG. The axial height of the commutator 14 is suppressed by making the heights of the commutators 14 the same.

The first segment member 21a shown in FIG. 5 (A), the second segment member 21b shown in FIG. 5 (B), and the third segment member 21c shown in FIG. 5 (C) have the pressure equalizing portions 26a, 26b. 26c, the inner diameters E1, E2, E3 and the shaft diameter E0 of the rotary shaft 3 are
E0 <E1 <E2 <E3 (3)
It is set to meet the Thereby, the segment member assembly 22 is established, and the commutator 14 can be externally fixed to the rotating shaft 3.

  Here, as shown in the above formula (3), the three segment members 21 include a commutator manufacturing cartridge (details will be described later) having a columnar stepped portion whose diameter gradually increases from the upper stage to the lower stage. It is possible to use positioning and combine them with one another, which reduces the manufacturing costs.

Next, electrical connection between the commutator 14 and the armature 6 will be described with reference to FIGS. 7 and 8.
FIG. 7 is a plan view of the segment member assembly 22 as seen from the armature core 12 side.
As shown in the figure, a total of nine segment parts 31 constitute an outer peripheral sliding surface of the commutator 14 as a whole by combining all three segment parts 31 which each segment member 21 has respectively in a cylindrical shape. Here, the three segment portions 31 having the same potential are connected to each other by the pressure equalizing line portion 26 and are electrically connected.

  In FIG. 7, the connection between the three segment portions 31a of the first segment member 21a disposed on the side closest to the armature core 12 in the axial direction and the pressure equalizing line portion 26a is illustrated. Similarly, in the second segment member 21b and the third segment member 21c, the three second segment portions 31b and the third segment portions 31c are connected to each other. 7, only a part of the pressure equalizing portions 26b and 26c is shown. On the other hand, since the equalizing line portions 26 connecting the segments other than the segments having the same potential are spaced apart from each other, they are insulated from each other.

FIG. 8 is a developed view of the armature 6.
Here, when the segments having the same potential are electrically conducted as described above, as shown in FIG. 8, the current supplied from the brush in sliding contact with the segment portion 31 is the same as the other current through the pressure equalizing portion 26. It is supplied to the segment part 31 which becomes the potential. The current supplied to the segment portions 31 is further supplied to the corresponding armature coils 13 through the windings 24.

The specific current supply flow in the armature 6 will be described below with reference to FIG.
Since the DC motor 2 in the present embodiment is a so-called six-pole nine-slot nine-segment three-phase motor, as indicated by thick lines in the figure, the segment parts 31 having the same potential have one phase, for example, the first segment part The 31st and 4th segment parts 31 and the 7th segment part 31 are three. Here, the segment portions 31 having the same potential are short-circuited by the pressure-equalizing line portion 26, and as shown in the figure, every two segment portions 31 are short-circuited by the pressure-equalizing portion 26. ing.

More specifically, as shown by a thick line in FIG. 8, when the winding start end 24a starts to be wound from the seventh segment portion 31, the winding 24 has a first armature coil 13a, a second armature coil 13b, 3 form the armature coil 13c and reach the winding end 24b. That is, the current supplied by the brush in sliding contact with any one of the first segment portion 31, the fourth segment portion 31, and the seventh segment portion 31 short-circuited with each other in the voltage equalization portion 26 is the other two The two segments are also supplied via the pressure equalizing line portion 26.
Therefore, a magnetic field is generated simultaneously by supplying currents in phase to the three armature coils 13 (first armature coil 13a, second armature coil 13b, and third armature coil 13c) connected in series. The rotating shaft is rotated by a magnetic attractive force / repulsive force generated between the magnetic force of the magnetic field and the permanent magnet.

(Commutator manufacturing cartridge)
Subsequently, the commutator manufacturing cartridge 36 will be described.
FIG. 9 is a perspective view showing the configuration of the commutator manufacturing cartridge 36. As shown in FIG. FIG. 10 is a plan view of the commutator manufacturing cartridge 36 as viewed from the opening 38 side. FIG. 11 is a cross-sectional perspective view of the commutator manufacturing cartridge 36 and the third segment member 21c.
The cartridge for manufacturing the commutator 36 is set in a mold with the segment member assembly 22 fixed inside, and after injection of resin and molding of the commutator main body 19, peeling off from the commutator 14, for manufacturing It is a jig.
As shown in FIG. 9, the cartridge for manufacturing the commutator 36 is formed along the axial direction on the bottomed cylindrical cartridge main body 37 made of flexible silicon and the inner peripheral surface of the cartridge main body 37. And a plurality of projecting ridges 45.

Inside the cartridge body 37, the segment member assembly 22 is held in a cylindrical shape as shown in FIG.
More specifically, in the segment member assembly 22, the circumferential direction position of the three segment members 21 is determined by the ridges 45 entering between the adjacent segment portions 31, and as a whole, it has a cylindrical shape. Retained.

As shown in FIGS. 9 and 10, the cartridge main body 37 has a cylindrical portion 40, an opening 38, and a bottom portion 39. As shown in FIG. A stepped portion 43 is provided.
A plurality of ridges 45 provided on the inner peripheral surface of the cylindrical portion 40 are provided in the axial direction from the opening 38 to the bottom surface 49, and as shown in FIG. Protrusively toward. Further, the ridge 45 protrudes radially inward with the same width from the opening 38 to the ridge end surface 47 in plan view. The outer peripheral surface of the cylindrical portion 40 and the outer surface of the bottom 39, that is, the surface located on the outer side of the cartridge main body are formed by a flat uniform surface so as to receive resin pressure and mold pressure uniformly.

  The opening 38 is provided at one end of the cylindrical portion 40 opposite to the bottom 39 in the axial direction. The position of the opening 38 is set to a position at which the riser 18 extending from each segment 31 held inside the cartridge for manufacturing a commutator 36 is folded back. More specifically, as shown in FIG. 11, the riser 18 is temporarily folded back to the outside diameter side at the position on the inner peripheral side of the opening 38, and further extends to the outside diameter side, and the position on the outer peripheral side of the opening 38 is It is folded back to the opposite side to the armature core 12 along the axial direction at a position beyond which it is formed in a substantially U shape.

  The bottom 39 is provided on the opposite side of the opening 38 of the cylindrical portion 40, and holds the segment member assembly 22 from the side of the pressure equalizing line 26 in the cartridge 36 for manufacturing a commutator. As shown in FIG. 11, a columnar stepped portion 43 whose diameter increases stepwise from the upper stage to the lower stage is provided at the approximate center of the bottom surface 49.

  The stepped portion 43 has four steps 41 as shown in FIGS. 10 and 11. The stepped portion 43 has a shape in which cylinders having different diameters of four steps are concentrically stacked on the bottom surface 49 in the order from the lower end to the larger diameter and integrated. Here, the four step portions 41 corresponding to each cylinder are a first step portion 41a, a second step portion 41b, a third step portion 41c, and a fourth step portion 41d from the top. A first round chamfer 44a, a second round chamfer 44b, and a third round chamfer 44c are formed on the corners of the first step 41a, the second step 41b, and the third step 41c, respectively. Has been.

  The first step portion 41a has a stepped portion end surface 46 which is a surface parallel to the bottom surface 49, and a first step portion side surface 48a along the axial direction. The second step portion 41 b has a placement surface 42 a on which the first pressure equalizing line portion 26 a is placed and which is a surface parallel to the bottom surface 49. The third step portion 41 c has a placement surface 42 b on which the second pressure equalizing portion 26 b is placed and which is a plane parallel to the bottom surface 49. The fourth step portion 41 d has a placement surface 42 c on which the third pressure equalizing portion 26 c is placed and which is a plane parallel to the bottom surface 49.

Next, the dimension in the axial direction of each stepped portion 41 will be described based on FIGS. 12 and 13.
FIG. 12 is a cross-sectional perspective view of the commutator manufacturing cartridge 36 and the segment member assembly 22 in the mold. FIG. 13 is a partially enlarged sectional view of the commutator manufacturing cartridge 36 and the segment member assembly 22.

As shown in FIG. 4, FIG. 5, FIG. 11, and FIG. 12, the three segment members 21 are set to different lengths (L1 to L3) for the segment portions 31, respectively. To form a stepped portion 43 inside the cartridge 36 for producing a commutator.

  Here, the segment member 21 having a short length (L) of the segment portion 31 is placed on the placement surface 42 having a higher axial height (H). Further, the segment member 21 having a long length (L) of the segment portion 31 is mounted on the mounting surface 42 having a lower height (H) in the axial direction.

Below, based on FIG. 13, the dimension of an axial direction is demonstrated more concretely.
On the left side of the figure, the axial positions of the anchor lower end 34, the stepped end face 46, the first mounting surface 42a, the second mounting surface 42b, the third mounting surface 42c and the bottom surface 49 are the same. It is indicated by a two-dot chain line. Here, as shown in the figure, the mounting surface 42a is at the position of the height H1 in the axial direction (hereinafter referred to as "height H1") from the position of the mounting surface 42c serving as the axial starting point of the length L3. Is set to Similarly, the mounting surface 42b is also set at a position at an axial height H2 (hereinafter referred to as "height H2") from the position of the mounting surface 42c which is the starting point of the length L3 in the axial direction. Further, the mounting surface 42a is set to a position at an axial height H3 (hereinafter referred to as "height H3") from the position of the mounting surface 42b.

Here, the segment member 21a having the shortest axial length L1 is placed on the placement surface 42a located at the height H1 higher in the axial direction. At that time, the height H1, the length L1 and the length L3 are
H1 + L1 = L3 (4)
It is set to meet the

By satisfying the equation (4), the axial height of the first segment portion 31a of the length L1 and the third segment portion 31c of the length L3 placed on the mounting surface 42a positioned at the height H1. The height is the same.
The segment member 21b having an axial length L2 longer than L1 is placed on the placement surface 42b positioned at a lower height H2 in the axial direction. At that time, the height H2, the length L2 and the length L3 are
H2 + L2 = L3 (5)
It is set to meet the
By satisfying the equation (5), the axial height of the second segment portion 31b of the length L2 and the third segment portion 31c of the length L3 placed on the mounting surface 42b positioned at the height H2 The height is the same.

Here, in order to establish the segment member assembly 22, as shown in the above formulas (4) and (5), H1, H2, H3, L1, L2 and L3 are:
H1 + L1 = H2 + L2 = L3 (6)
It is set to meet the

  That is, the segment member 21 having a short length (L) of the segment portion 31 is placed on the mounting surface 42 having a higher axial height (H), while the length (L) of the segment portion 31 is The long segment member 21 is placed on the placement surface 42 having a lower axial height (H).

In this way, the three segment members 21 having different lengths (L) in the axial direction of the segment portion 31 correspond to the height (H) in the axial direction of the mounting surface 42 corresponding to the length (L) of the segment portion. By doing so, the height in the axial direction when the segment member assembly 22 is configured is set to be the same height.
Similarly, the axial positions of the anchor upper end 35 and the anchor lower end 34 of each segment 31 are set to be the same.

  Further, in addition to the height corresponding to the thickness of the pressure equalizing line portion 26c, the height H2 is a height for arranging the pressure equalizing line portion 26c and the pressure equalizing line portion 26b at an interval in the axial direction. It is set to the added height. Similarly, the height H3 is a height for arranging the pressure equalizing line portion 26b and the pressure equalizing line portion 26a at an interval in the axial direction in addition to the height corresponding to the thickness of the pressure equalizing line portion 26b. It is set to the height which added.

Here, in order to arrange each segment member 21 at intervals in the axial direction, each height H1, H2, H3 is:
H2 + H3 = H1 (7)
It is set to meet the
Thus, insulation is secured by arranging the pressure equalizing line portions 26a, 26b, and 26c at intervals in the axial direction, respectively, and a resin flow path at the time of molding is formed between the pressure equalizing line portions 26. Secured.

  Further, as shown in FIG. 13, the mounting surface 42 c is set to have a height so as to be spaced from the position of the bottom surface 49 in the axial direction. In the space created by this axial distance, the resin dissolved at the time of molding intrudes and securely fixes the commutator body 19 and the segment member assembly 22.

Next, the dimension in the radial direction of each step portion 41 will be described based on FIGS. 12 and 13.
The radial dimension of the step portion 41 corresponds to the three pressure equalizing line portions 26a, 26b, and 26c concentrically with the step portion side surface 48a, the step portion side surface 48b, and the step portion side surface 48c of the step portion 41 as positioning guides, respectively. It is set to be disposed on each mounting surface 42.

  Specifically, the diameter D1 (hereinafter referred to as “diameter D1”) of the stepped portion side surface 48a of the first stepped portion 41a is set so that the pressure equalizing line portion 26a having the inner diameter E1 can be positioned and assembled. Yes. Similarly, the diameter D2 (hereinafter referred to as “diameter D2”) of the stepped portion side surface 48b of the second stepped portion 41b can position and assemble the pressure equalizing line portion 26b having the inner diameter E2, and further the third stepped portion 41c. The diameter D3 (hereinafter referred to as "diameter D3") of the stepped portion side surface 48c is set so that the pressure equalizing line portion 26c with the inner diameter E3 can be positioned and assembled.

  That is, each inner diameter E1 to E3 is set to a size slightly larger than the corresponding each diameter D1 to D3. Therefore, the diameter D of the stepped portion side surface 48 passes through the inside of the inner diameter E of the pressure equalizing line portion 26, thereby placing the segment member 21 while placing the pressure equalizing line portion 26 on the mounting surface 42 of the stepped portion 41. It can be fixed in the positioned state.

  In other words, the dimension in the radial direction is set such that the segment members 21 and the step portions 41 of the cartridge for manufacturing a commutator 36 correspond only one to one. Therefore, one of the segment members 21 is not assembled to the stepped portion 41 having the stepped portion side surface 48 having the diameter D different from the inner diameter E, and the stepped portion 43 having the plurality of stepped portions 41 is provided. By this, it is possible to prevent a wrong assembly.

Further, as shown in FIG. 12, the difference between the diameter D1 of the side surface 48a of the stepped portion and the diameter D2 of the side surface 48b of the stepped portion is a size obtained by combining the dimensions of the second rounded chamfer 44b and the mounting surface 42b in the radial direction. It is set to be. Similarly, the difference between the diameter D2 of the stepped portion side surface 48b and the diameter D3 of the stepped portion side surface 48c is set to be equal to the dimension in the radial direction of the third rounded surface 44c and the mounting surface 42c. Yes.
Therefore, while the step portions 41 support the pressure equalizing line portion 26 against the resin pressure on the mounting surface 42, the round chamfered portion 44 secures a space for filling the resin.

(Manufacturing method of commutator)
Subsequently, a method of manufacturing the commutator 14 will be described.
First, a metal plate (not shown) is punched, and the segment member 21 on which the riser 18 and the pressure equalizing line portion 26 have been bent is set in a press working apparatus for anchor cutting. The segment member 21 is formed such that the pressure equalizing line portion 26 is disposed on the end face side of the commutator main body 19 and the axial end of the segment portion 31 and the pressure equalizing line portion 26 are located on the same plane.

  Next, in order to form the anchor 32, the inner peripheral surface of the segment portion 31 is cut along the axial direction while moving the cutting blade for press working from the riser 18 side toward the pressure equalizing line portion 26. At that time, the press load of the cutting blade applied to the segment member 21 is applied to the entire surface of the pressure equalizing line portion 26 which is an end surface. Further, the press load of the cutting blade applied to the press die is received by the entire surface of the pressure equalizing line portion 26 to be the end face of the segment member 21 and transmitted to the press die in an area corresponding thereto. Therefore, it is possible to cut the anchor at a relatively low contact pressure.

  Subsequently, the commutator manufacturing cartridge is set in a mold (see FIG. 12). At this stage, the segment member 21 is not assembled inside the commutator manufacturing cartridge. Next, as shown in FIG. 11, three segment members 21 are assembled in the axial direction in the order from the lower stage to the upper stage of the step portion 41 in the cartridge 36 for manufacturing the commutator.

  More specifically, the third segment member 21c is assembled to the step portion 41c. At this time, positioning in the radial direction is performed by the inner diameter E3 of the pressure equalizing portion 26c and the diameter D3 of the step portion 41c. In addition, positioning in the axial direction is performed by mounting the pressure equalizing portion 26c on the mounting surface 42c. Further, the convex strip 45 is brought into contact with both ends of the segment 31c in the circumferential direction to perform circumferential positioning. As a result, the third segment member 21c is fixed at a predetermined position of the commutator manufacturing cartridge 36 and assembled.

  Next, the second segment member 21b is assembled to the stepped portion 41b. At this time, positioning in the radial direction is performed by the inner diameter E2 of the pressure equalizing portion 26b and the diameter D2 of the step portion 41b. In addition, positioning in the axial direction is performed by mounting the pressure equalizing portion 26b on the mounting surface 42b. At this time, the segment member 21b is mounted while being rotated so that the segment portion 31b does not overlap with the already assembled segment portion 31c. Then, the protrusions 45 are brought into contact with both ends of the segment portion 31b in the circumferential direction to perform positioning in the circumferential direction. Thus, the second segment member 21b is fixed at a predetermined position of the commutator manufacturing cartridge 36 and assembled.

  Next, the first segment member 21a is assembled to the stepped portion 41a. At this time, positioning in the radial direction is performed by the inner diameter E1 of the pressure equalizing line portion 26a and the diameter D1 of the step portion 41a. In addition, positioning in the axial direction is performed by mounting the pressure equalizing portion 26a on the mounting surface 42a. At this time, the segment member 21a is mounted while being rotated so that the segment portion 31a does not overlap with the already assembled segment portions 31b and 31c. Then, the protrusions 45 are brought into contact with both ends in the circumferential direction of the segment part 31a to perform circumferential positioning. Thereby, the first segment member 21a is fixed at a predetermined position of the commutator manufacturing cartridge 36 and assembled.

  Thus, as shown in FIG. 12, each segment 31 is set in the mold so as to form a cylindrical segment 17 of the same height at the opening 38 side end of the cartridge body 37 as a whole. Thus, the segment member assembly 22 shown in FIG. 4 is completed inside the commutator manufacturing cartridge 36.

Next, resin molding of the commutator body 19 will be described with reference to FIGS. 12, 14, and 15.
FIG. 14 is a cross-sectional perspective view of the commutator 14 in the commutator manufacturing cartridge 36. FIG. 15 is a partially enlarged sectional view of the commutator 14 in the commutator manufacturing cartridge 36.
After the segment member assembly 22 is completed inside the commutator manufacturing cartridge 36 in the mold, the mold set in the resin molding machine is closed, and the melted resin is filled, for example, by the screw pressure of the injection molding machine.

  As shown in FIG. 14, the melted resin flows into the inside of the mold from the gate 23 provided on the riser 18 side of the commutator 14. The resin filled in the vicinity of the gate 23 is not blocked in flow because the pressure equalizing portions 26 are located on the axially opposite side from the gate 23, and continues to flow into the mold with a screw pressure.

  When the melted resin reaches the inner peripheral surface of the segment 17, it enters the V groove of the anchor 32 formed on the inner peripheral surface of the segment portion 31. On the other hand, since the intervals provided in the circumferential direction of the segment portions 31 are closed by the ridges 45, the resin does not flow.

  In addition, the resin that has flowed into the inside of the mold reaches the pressure equalizing line portion 26 a located on the end face side opposite to the gate 23. Here, the resin flows into the notch portion of the pressure equalizing line portion 26a formed in a C shape by the screw pressure, and is further pushed away between the pressure equalizing line portion 26a and the pressure equalizing line portion 26b.

  Here, as shown in FIG. 13, since the inner diameter side of the pressure equalizing line portion 26b is in contact with the round chamfered portion 44b and the stepped portion side surface 48b of the commutator manufacturing cartridge 36, the dissolved resin is equalized. It flows in between the pressure equalizing line 26a and the pressure equalizing line 26b from one direction on the outer diameter side of the portion 26b.

  The resin filled between the pressure equalizing line portion 26a and the pressure equalizing line portion 26b is further opened by the round chamfered portion 44b to the inner diameter side of the pressure equalizing line portion 21b, and secured by the round chamfered portion 44b. Fill the remaining space.

  Then, the resin that continues to flow further reaches the pressure equalizing line portion 26a and flows into the notch portion of the pressure equalizing line portion 26a formed in a C shape. At this time, since the inner diameter side of the pressure equalizing line portion 26c is in contact with the round chamfered portion 44c and the stepped portion side surface 48c, the pressure equalizing line portion 26b and the pressure equalizing from one direction on the outer diameter side of the pressure equalizing line portion 26c. It flows in between the line part 26c. And since the flow path to the inside diameter side of pressure equalization line part 26b is opened by resin by round chamfer 44b, the space secured by round chamfer 44b is filled.

  Further, the resin is forced to flow from the notch of the pressure equalizing line portion 26c in the end face direction, and the space provided in the axial direction between the mounting surface 42c and the bottom surface 49 is filled from one direction on the outer diameter side. The resin thus uniformly filled in the space in the mold is integrally molded with the segment member assembly 22 as the commutator body 19 by curing.

Next, processing after molding of the commutator main body 19 will be described based on FIG.
FIG. 16 is a cross-sectional view of the commutator 14 in the cross section shown in FIG.
After the resin is cured in the mold and the commutator main body 19 and the segment member assembly 22 are integrally formed, the mold is opened and the commutator 14 is taken out by a takeout mechanism such as an ejector pin.

  As shown in FIG. 16, the commutator 14 exposes the segments 17 on the outer peripheral sliding surface by peeling the flexible silicon material commutator manufacturing cartridge 36. Here, the segments 17 formed on the outer peripheral surface of the commutator 14 are formed by holding the nine segment portions 31 in a cylindrical shape at intervals by the ridges 45. Therefore, unlike the case where the segment 17 is configured using a single plate material, it is not necessary to perform slit processing in order to insulate the conductive member on the outer peripheral surface.

  As described above, the commutator 14 according to the present embodiment is formed of the segment member assembly 22 configured in a cylindrical shape by combining a plurality of conductive segment members 21 and the resin in the segment member assembly 22. And a commutator body 19 that is externally fitted and fixed to the rotary shaft 3, and the segment member 21 includes a plurality of segment portions 31 that constitute an outer peripheral sliding surface of the commutator body 19, and each of the segment portions 31. It has an anchor 32 formed on the inner circumferential surface, and a pressure equalizing line portion 26 connecting the segment portions 31 having the same potential among the plurality of segment portions 31, and the pressure equalizing line portion 26 A plurality of the segments are formed by bending radially inwards from an axial end of the rotation shaft 3 in the segment 31 so as to be on the same plane as the end. The axial length of the rotating shaft 3 in the different segments 31 of the potential of the member 21 is set to different lengths.

  Therefore, since the winding operation of the equalizing wire can be eliminated, the manufacturing time can be shortened, the operation of the winding machine can be simplified, and the management process can be simplified, thereby reducing the manufacturing cost of the commutator 14. Further, since the load at the time of cutting the anchor 32 on the inner surface side of the segment portion 31 is received by the entire pressure equalizing line portion 26 serving as the end face, deformation of members is hard to occur, the anchor cutting process becomes easy, and the life of the anchor press is shortened. Can be suppressed. In addition, since the lengths in the axial direction of the segment portions 31 are different from each other, the segment members 21 can be combined only in the prescribed order, and erroneous assembly can be prevented. Further, since the pressure equalizing line portion 26 is disposed on the end face side of the commutator main body 19 and is formed on the same plane as the axial end portion of the segment member 21, a member extending in the axial direction is not necessary, and the material cost is reduced. Can be reduced. In addition, since the plurality of segment portions 31 are combined in a tubular shape, slit processing of the segments 17 is unnecessary, and the cost can be reduced.

In the commutator 14, the pressure equalizing line portion 26 is formed in a C shape.
Therefore, since the notch portion becomes a flow path of the dissolved resin at the time of resin molding, it is possible to sufficiently suppress the molding failure such as the short shot because the resin spreads sufficiently.

In the commutator 14, the inner diameters of the pressure equalizing portions 26 are set to different sizes, and the pressure equalizing portions 26 are arranged concentrically at an interval.
Therefore, insulation between the pressure equalizing portions 26 can be secured, and a short circuit can be prevented. Further, since the resin enters between the pressure equalizing line portions 26, the fixing force between the segment member 21 and the commutator main body 19 can be increased. Further, by assembling the cartridge to the commutator manufacturing cartridge 36 having the column-shaped stepped portion 43 whose diameter gradually increases from the upper stage to the lower stage, positioning at the time of assembly and erroneous assembly prevention can be achieved.

  As described above, the reduction gear motor 1 according to the present embodiment includes the segment member assembly 22 configured in a tubular shape by combining a plurality of conductive segment members 21 and the inside of the segment member assembly 22. A commutator body 19 that is molded from resin and is fitted and fixed to the rotary shaft 3. The segment member 21 includes a plurality of segment portions 31 that constitute an outer peripheral sliding surface of the commutator body 19, and each of the segments. An anchor 32 formed on an inner peripheral surface of the portion 31; and a pressure equalizing portion 26 connecting the segment portions 31 having the same potential among the plurality of segment portions 31; Is formed by bending inward in the radial direction so as to be on the same plane as the end in the axial direction from the axial end of the rotation shaft 3 in the segment 31; The axial length of the rotating shaft 3 in the different segments 31 of the potential of the bets member 21 is equipped with a commutator, characterized in that it is set to different lengths.

  Accordingly, it is possible to provide the reduction-gear motor 1 equipped with the commutator 14 which can simplify the manufacturing process and the management process and can reduce the manufacturing cost.

  As described above, the commutator manufacturing cartridge 36 of the present embodiment includes a bottomed cylindrical cartridge main body 37 that holds the segment member assembly 22 in a cylindrical shape, and a plurality of step portions on the bottom surface 49 of the cartridge main body 37. And a stepped portion 43 formed on each of the step portions 41 so as to have the equalizing line portion 26 mounted thereon.

  Therefore, it is possible to provide the commutator manufacturing cartridge 36 of the commutator 14 that can simplify the manufacturing process and the management process and reduce the manufacturing cost. Further, when the plurality of segment members 21 are set in the commutator-manufacturing cartridge 36, the segment members 21 can be positioned in the radial direction, the axial direction, and the circumferential direction. Moreover, since the pressure equalizing line part 26 is supported by the surface of the stepped part 43, it can prevent that the pressure equalizing line parts 26 contact and short-circuit by resin pressure. In addition, since resin does not flow from the inner diameter side between the pressure-equalizing portions 26 and only from the outer diameter side, the resin does not flow from both sides and mold cracking occurs due to air bubbles in the commutator main body 19. Can be prevented.

  Further, in the commutator manufacturing cartridge 36, the height of the stepped portion 41 of the stepped portion 43 is set so that the height of the end of the cartridge body 37 on the side of the opening 38 in each segment portion 31 is the same height. Has been.

  Therefore, while the pressure equalizing portions 26 are arranged at intervals in the axial direction, the axial length of the commutator 14 can be suppressed.

In the commutator manufacturing cartridge 36, a round chamfered portion 44 is formed at the corner of the stepped portion 41.
Therefore, the resin can be sufficiently introduced into the space secured by the round chamfered portion 44 without the corner portion blocking the resin flow path.

Further, in the cartridge for manufacturing the commutator, on the inner peripheral surface of the cartridge main body 37, while positioning in the circumferential direction of the plurality of segment portions 31 is performed, convex ridges 45 for holding the plurality of segment portions 31 are formed. ing.
Therefore, it can assemble | attach so that the protruding item | line part 45 may be located between the adjacent segment parts 31, and the jig | tool for positioning becomes unnecessary. Further, the ridges 45 can prevent the resin from flowing out between the adjacent segment parts 31 to the sliding surface side of the segment parts 31.

  The present invention is not limited to the above-described embodiment, and includes the above-described embodiment with various modifications, without departing from the spirit of the present invention.

For example, in the above-mentioned embodiment, the case of the segment member 21 which used the copper plate material was demonstrated. However, the present invention is not limited to this, and a conductive material such as a tin plate may be used.

  Also, for example, in the above-described embodiment, the respective pressure equalizing portions 26 have a small overlapping portion in plan view. However, the present invention is not limited to this, and as long as the mounting surface 42 that can withstand the resin pressure is ensured, it may overlap with a larger area in plan view.

  Also, for example, in the above-described embodiment, the case where the segment member assembly 22 is completed by assembling the segment members 21 after setting the commutator manufacturing cartridge 36 in the mold has been described. However, the present invention is not limited to this, and the segment member 21 may be assembled to the commutator manufacturing cartridge 36 and the commutator manufacturing cartridge 36 may be set in a mold after the segment member assembly 22 is completed.

  Further, for example, in the above-described embodiment, the case of using flexible silicon as a material of the cartridge for manufacturing the commutator 36 has been described. However, the present invention is not limited to this, and other materials suitable for resin molding and peeling after molding may be used.

DESCRIPTION OF SYMBOLS 1 ... Motor with reduction gear 2 ... DC motor 3 ... Rotary shaft 4 ... Worm gear reduction gear 5 ... Yoke 6 ... Armature 7 ... Gear housing 8 ... Worm 9 ... Worm wheel 10 ... Bearing 11 ... Output plate 12 ... Armature core 13 ... Armature Coil 13a ... 1st armature coil (armature coil)
13b ... 2nd armature coil (armature coil)
13c ... Third armature coil (armature coil)
14 ... Commutator 15 ... Metal plate 16 ... Teeth 17 ... Segment 18 ... Riser 18a ... Riser base end 18b ... Riser winding locking face 18c ... Riser winding separation preventing face 18d ... Riser end face 18f ... Riser corner 19 ... Commutator body 20 ... through hole 21 ... segment member 21 a ... first segment member (segment member)
21b ... second segment member (segment member)
21c ... 3rd segment member (segment member)
22 ... Segment member assembly 23 ... Gate 24 ... Winding 26 ... Pressure equalizing line part 26a ... First pressure equalizing line part (equal pressure equalizing line part)
26b ... 2nd pressure equalizing section (equalizing section)
26c ... 3rd pressure equalizing section (equalizing section)
31 ... segment part 31a ... 1st segment part (segment part)
31b ... 2nd segment part (segment part)
31c ... 3rd segment part (segment part)
32 ... Anchor 32a ... First anchor (anchor)
32b ... 2nd anchor (anchor)
32c ... 3rd anchor (anchor)
33 ・ ・ ・ Proximal end (axial end of rotary shaft)
33a ... Base end (axial end of the rotating shaft)
33b ... proximal end (axial end of rotation axis)
33c ... Base end portion (axial end portion of rotating shaft)
36: Cartridge for manufacturing commutator 37: Cartridge body 38: Opening 39: Bottom portion 40: Tubular portion 41: Stepped portion 41a: First step (stepped portion)
41b ... 2nd step part (step part)
41c ... 3rd step part (step part)
41d ... 4th step part (step part)
43 ... Stepped portion 44 ... Round chamfered portion 44a ... Round chamfered portion (round chamfered portion)
44b ... Round chamfer (round chamfer)
44c ... Round chamfer (Round chamfer)
45 ... ridge 49 ... bottom

Claims (9)

A segment member assembly configured by combining a plurality of conductive segment members into a tubular shape;
A commutator body that is molded with resin inside the segment member assembly and is externally fixed to the rotary shaft;
Equipped with
The segment member is
A plurality of segment parts constituting an outer peripheral sliding surface of the commutator body;
An anchor formed on the inner peripheral surface of each of the segment parts;
Among the plurality of segment parts, a pressure equalizing line part connecting the segment parts having the same potential;
Have
Each of the pressure equalizing line portions is formed with a through hole in which the rotation shaft can be disposed on the radially inner side of the pressure equalizing line portion, and the inner diameter of each of the through holes is different from each other. It is formed by bending from the axial end of the rotating shaft toward the radially inner side so as to be on the same plane as the end,
And each said pressure equalization line part is arranged in steps so that each may become a position which differs in an axial direction and a diameter direction as it goes to a diameter direction inner side from the diameter direction outside,
The commutator characterized in that the axial length of the rotation axis in the segment part having a different potential among the plurality of segment members is set to a different length.   The commutator according to claim 1, wherein the pressure equalizing line portion is formed in a C shape. The commutator according to claim 1 or 2, wherein a part of the surface on the inner diameter side of the pressure equalizing line portion is exposed from the resin. Before KiHitoshi pressure line section, commutator according to any one of claims 1 to 3, characterized in that it is arranged concentrically at a distance from one another. The motor with a reduction gear carrying the commutator as described in any one of Claims 1-4 . A commutator manufacturing cartridge for manufacturing the commutator according to any one of claims 1 to 4 ,
A bottomed cylindrical cartridge main body for holding the segment member assembly in a cylindrical shape;
A stepped portion formed on the bottom surface of the cartridge main body so as to have a plurality of stepped portions, and the pressure equalizing portion is mounted on each of the stepped portions;
A cartridge for manufacturing a commutator, comprising: The height of the stepped portion of the stepped portion, according to claim 6 in which the height of the opening side end of the cartridge body of each said segment portion is characterized in that it is set to have the same height Cartridge for manufacturing commutator. The corner portion of the stepped portion, commutators manufactured cartridge according to claim 6 or claim 7, characterized in that the round chamfered portions are formed. On the inner peripheral surface of the cartridge main body, the plurality of segment portions are positioned in the circumferential direction, and convex portions that hold the plurality of segment portions are formed along the axial direction. A cartridge for manufacturing a commutator according to any one of claims 6 to 8 .

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