JP4440448B2 - Motor core insulation molding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molding apparatus for integrally molding an insulating resin on a core (iron core) of a motor.
[0002]
[Prior art]
Conventionally, in a rotor having a rotating shaft and a core fixed to the rotating shaft, an insulating resin is integrally formed on a core end surface or an inner peripheral surface of a slot, which is a portion where a winding wound around the core can contact. Thus, there has been proposed one in which a short circuit of the winding is prevented. A general molding apparatus for molding such an insulating resin is shown in FIG.
[0003]
As shown in FIG. 6, the molding apparatus 50 includes a lower mold 51 and an upper mold 52 disposed so as to face and separate from the lower mold 51. The molds 51 and 52 hold the core 62 fixed to the rotating shaft 61 of the motor at a predetermined position. In the molds 51 and 52, core end surface insulating portions 63a and 63b and in-slot insulating portions 63c having substantially the same shape as the end surface and the inner peripheral surface are formed on both end surfaces in the axial direction of the core 62 and the inner peripheral surface of the slot, respectively. Accordingly, the core end surface molding portions 53a and 53b and the slot inner peripheral surface molding portion 53c are formed.
[0004]
Then, an insulating resin is filled in a space formed between the core 62 and the rotary shaft 61 and the core end surface molding portions 53a and 53b and the slot inner peripheral surface molding portion 53c of the molds 51 and 52 from a gate (not shown). The insulating portions 63a to 63c are integrally formed with the core 62.
[0005]
[Problems to be solved by the invention]
However, the molds 51 and 52 of the molding apparatus 50 described above are set so that the parting surface P and one end surface of the core 62 are flush with each other. In other words, the parting surface P is set at a portion where the outer peripheral surface 63d of the core end surface insulating portion 63a is formed. For this reason, when resin leaks into the gap between the parting surfaces P due to the molding pressure of the insulating resin, the resin leakage occurs as burrs 64 on the outer peripheral surface 63d of the core end surface insulating portion 63a.
[0006]
If the motor is assembled by using the core 62 in which the burr 64 is generated as described above and the motor is assembled, the clearance between the outer peripheral surface of the rotor and the magnet is very small. 64 collides with the magnet and adversely affects the rotation of the motor.
[0007]
For this reason, conventionally, the burr 64 generated after molding has been shaved. However, since the work of cutting the burr 64 is a complicated work, it has been required to prevent the burr 64 from being generated.
[0008]
The present invention has been made to solve the above-described problems, and an object of the present invention is to prevent the occurrence of burrs that hinder the rotation of a motor in a molding apparatus that integrally molds an insulating resin with a motor core. An object of the present invention is to provide a motor core insulating part forming apparatus.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 holds a core having a slot for accommodating a winding in first and second molds which are arranged to be relatively close to and away from each other. A core end surface molding portion and a slot inner circumferential surface molding portion that integrally form an insulating resin so as to substantially cover the axial end surface of the core and the inner peripheral surface of the slot to form the core end surface insulating portion and the slot inner insulating portion. An apparatus for forming an insulating part of a motor core, wherein the parting surfaces of the first and second molds are substantially flat intersecting with the axis of the set core, and the core end face in the core end face forming part It was set at a predetermined position in the axial direction of the core other than the portion forming the outer peripheral surface of the insulating portion.
[0011]
The invention according to claim 2, the insulating portion molding device of the motor core of claim 1, wherein the mold in order to mold the core end face insulating portion provided integrally with the insulating base of the commutator, the core end face The molding part for the base is integrally provided with the molding part for the base.
[0012]
(Function)
According to the first aspect of the present invention, the parting surfaces of the first and second molds are set to a portion other than the portion that forms the outer peripheral surface of the core end surface insulating portion in the core end surface molding portion. Therefore, when the insulating part is integrally formed with the core, even if the resin leaks into the gap between the parting surfaces due to the molding pressure of the insulating resin, no burr due to the leakage of the resin occurs on the outer peripheral surface of the core end surface insulating part. . That is, it is possible to prevent the occurrence of burrs that hinder the rotation of the motor.
[0013]
Further , the parting surfaces of the first and second molds are substantially flat so as to intersect the axis of the core, and are set at a predetermined position in the axial direction of the core. Therefore, when the insulating part is integrally formed with the core, even if the resin leaks into the gap between the surfaces due to the molding pressure of the insulating resin, the burrs due to the resin leakage only occur in the insulating part in the slot, and the core end face insulation It does not occur on the outer peripheral surface of the part. Moreover, since the parting surfaces of the first and second molds are substantially flat, the parting surfaces of the respective molds can be easily formed.
[0014]
According to the second aspect of the present invention, since the mold is integrally provided with the base molding portion in the core end surface molding portion, the insulating base portion of the commutator is formed integrally with the core end surface insulating portion. Therefore, a complicated operation of forming and assembling the insulating base as a separate part is not necessary.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, the DC motor 1 includes a bottomed cylindrical yoke housing 2 and an end housing 3 fixed to the opening of the housing 2. 5 is provided. A rotor 10 is rotatably supported in both housings 2 and 3 by bearings 4 and 5. A plurality of magnets 6 are fixed at predetermined positions on the inner peripheral surface of the yoke housing 2 facing the outer peripheral surface of the rotor 10. The housings 2 and 3 also house other motor components such as brushes and brush holders (not shown).
[0016]
The rotor 10 includes a rotary shaft 11 supported by the bearings 4 and 5, a core (iron core) 12 press-fitted into the rotary shaft 11, a winding 13 wound around the core 12, A commutator (commutator) 14 that rotates integrally with the rotating shaft 11 is provided.
[0017]
The core 12 is configured by laminating a plurality of plate-like core materials 12a, and as shown in FIGS. 2 and 3, three teeth 12b extending radially and a winding 13 wound around the teeth 12b are formed. A slot 12c is formed to accommodate the. Further, a core end surface insulating portion 15a formed by integrally molding an insulating resin with a molding device 20 described later on both end surfaces in the axial direction of the core 12 and the inner peripheral surface of the slot 12c, which are portions where the winding wire 13 of the core 12 can come into contact. 15b and in-slot insulating portion 15c. The core end surface insulating portions 15a and 15b and the in-slot insulating portion 15c have substantially the same shape as the end surface and the inner peripheral surface so as to cover the end surface of the core 12 and the inner peripheral surface of the slot 12c, respectively.
[0018]
An insulating base portion 15d of the commutator 14 is integrally formed with one core end surface insulating portion 15a. An insertion hole 15e for inserting one end of three segments (commutator pieces) 16 is formed in the insulating base 15d. Then, the segment 16 inserted into the insertion hole 15e is held by a holding ring 17 whose other end is press-fitted into the rotating shaft 11, and is assembled so as not to fall off from the insulating base 15d, thereby forming a commutator 14.
[0019]
Next, FIG. 4 shows a molding apparatus 20 that integrally molds the insulating portions 15 a to 15 c with the core 12. The molding apparatus 20 includes a lower mold 21 and an upper mold 22 that is opposed to the lower mold 21 so as to be able to contact and separate in the vertical direction of the core 12. The molds 21 and 22 are configured to hold the core 12 fixed to the rotating shaft 11 at a predetermined position.
[0020]
In the molds 21 and 22, core end surface molding portions 23a and 23b are formed so as to form core end surface insulating portions 15a and 15b and in-slot insulating portions 15c with respect to both axial end surfaces of the core 12 and the inner peripheral surface of the slot 12c. And the slot inner peripheral surface molding portion 23c is formed. The core end surface molding portion 23a also includes a base molding portion 23d for molding the insulating base portion 15d.
[0021]
The molds 21 and 22 respectively extend from the outside (in the direction intersecting the paper surface in FIG. 4) into the slots 12c of the core 12 where the gates 24 for supplying the insulating resin are disposed, and the tips of the gates are further extended. There are two branches in the axial direction, and the branched gates 24 communicate with the core end surface molding portions 23a and 23b.
[0022]
Further, in the molding apparatus 20 of the present embodiment, the parting surfaces P of the dies 21 and 22 are formed into a planar shape perpendicular to the axis of the set core 12, and a predetermined position in the axial direction of the core 12 (FIG. 4). In the third sheet from the top of the core material 12a).
[0023]
In the molding apparatus 20 configured as described above, in molding the insulating portions 15a to 15c in the core 12, first, the rotating shaft 11 and the core 12 are set at predetermined positions in the lower mold 21, and then the upper mold 22 is in close contact with the lower mold 21.
[0024]
Next, as shown in FIG. 5, the space formed between the gate 24 and the core 12 and the rotary shaft 11 and the core end surface molding portions 23 a and 23 b and the slot inner peripheral surface molding portion 23 c of the molds 21 and 22. Is filled with insulating resin, and the insulating portions 15 a to 15 c are integrally formed in the core 12. At this time, since the air in the space escapes to the parting surface P through the gaps between the core members 12a and the like, the insulating resin is satisfactorily filled.
[0025]
When the supplied resin is solidified, the upper mold 22 is separated from the lower mold 21 and the rotating shaft 11 and the core 12 are taken out from the lower mold 21. And the unnecessary part 25 solidified in the gate 24 integrated with each insulation part 15a-15c is removed, and the core 12 by which each insulation part 15a-15c was integrally molded is completed.
[0026]
In the core 12 thus configured, the parting surfaces P of the molds 21 and 22 are set at predetermined positions in the axial direction of the core 12, that is, the outer peripheral surfaces 15f and 15g of the core end surface insulating portions 15a and 15b are formed. Even if the resin leaks into the gap of the parting surface P due to the molding pressure of the insulating resin, the burrs 26 due to this resin leakage are not present in the slots. It occurs in the insulating part 15c. That is, in this embodiment, burr does not occur on the outer peripheral surfaces 15f and 15g of the core end surface insulating portions 15a and 15b. Even if the rotor 10 is configured using the core 12 as it is and the motor 1 is assembled, There is no problem that the burr collides with the magnet 6 during rotation.
[0027]
The molds 21 and 22 have a nested structure having a plurality of nested parts 21a, 21b, and 22a. Therefore, since the molding parts 23a to 23c can be formed individually, it is easy to configure the molds 21 and 22, and it is possible to easily cope with the shape change of the molding parts 23a to 23c. Moreover, in the same manner as described above, the parting surfaces of the inserts 21a and 21b are set at portions other than the portions that form the outer peripheral surfaces 15f and 15g of the core end surface insulating portions 15a and 15b. Accordingly, burrs (not shown) are not generated on the outer peripheral surfaces 15f and 15g of the core end surface insulating portions 15a and 15b.
[0028]
In the present embodiment, the gate 24 is communicated with the vicinity of the core end surface molding portions 23a and 23b. In particular, the core end surface molding portion 23a is a portion that forms the core end surface insulating portion 15a including the insulating base portion 15d of the commutator 14, and the outer peripheral surface of the insulating base portion 15d is required to have high roundness. Therefore, by connecting the gate 24 to the vicinity of the core end surface molding portions 23a and 23b, the resin density of the insulating base portion 15d can be reliably increased, and the roundness of the outer peripheral surface of the base portion 15d can be increased. Can do.
[0029]
As described above, the present embodiment has the following effects.
(1) In this embodiment, the parting surfaces P of the molds 21 and 22 are set at predetermined positions in the axial direction of the core 12, that is, other than the portions where the outer peripheral surfaces 15f and 15g of the core end surface insulating portions 15a and 15b are formed. Is set. Accordingly, when the insulating portions 15a to 15c are integrally formed with the core 12, even if the resin leaks into the gap of the parting surface P due to the molding pressure of the insulating resin, the burr 26 due to the leakage of the resin will cause the burrs 26 in the slot 15c. It does not occur on the outer peripheral surfaces 15f and 15g of the core end surface insulating portions 15a and 15b. That is, it is possible to prevent the occurrence of burrs that hinder the rotation of the motor 1.
[0030]
(2) Since the parting surfaces P of the dies 21 and 22 are flat, the parting surfaces P of the dies 21 and 22 are easy to form.
(3) In the molds 21 and 22, the insulating base portion 15d of the commutator 14 can be formed integrally with the core end surface insulating portion 15a. Therefore, a complicated operation of molding and assembling the insulating base 15d as a separate part is not necessary.
[0031]
In addition, you may change embodiment of this invention as follows.
In the above embodiment, as shown in FIGS. 4 and 5, the parting surfaces P of the molds 21 and 22 have a planar shape perpendicular to the axis of the set core 12, and a predetermined position (see FIG. 4, the parting surface P is not limited to this, and at least other than the part forming the outer peripheral surfaces 15 f and 15 g of the core end surface insulating portions 15 a and 15 b. If it is.
[0032]
In the above embodiment, as shown in FIG. 4 and FIG. 5, the axial direction of the core 12 is set in the molds 21 and 22 as the vertical direction, but the configuration may be set other than the vertical direction, For example, it is good also as a structure set in the metal mold | dies 21 and 22 by making the axial direction of the core 12 into a horizontal direction.
[0033]
In the above embodiment, the insulating portions 15a to 15c are formed after the rotary shaft 11 is press-fitted into the core 12, but the insulating portions 15a to 15c may be formed by the core 12 alone.
[0034]
In the above embodiment, the insulating portions 15a to 15c are shaped as shown in FIG. 2, but are not limited to this shape. In addition, although the insulating base 15d is integrated with the core end surface insulating portion 15a, the insulating base 15d may be formed separately and assembled later.
[0035]
In the above embodiment, the present invention is applied to the core 12 of the DC motor 1, but may be applied to other motor cores.
It is described below technical ideas that can be grasped from the above embodiments.
[0036]
(B) it characterized in that a gate for supplying resin near the site for molding the pre-Symbol insulative base.
[0037]
(B) pre-Symbol first and second mold consists of nested structure having a plurality of insert, characterized in that the parting plane of the die insert is set to other than the outer periphery of the core end surface insulating portion .
[0038]
【The invention's effect】
As described above in detail, according to the present invention, in a molding apparatus that integrally molds an insulating resin to a motor core, a motor core insulating part molding apparatus that can prevent the occurrence of burrs that hinder the rotation of the motor is provided. be able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a DC motor according to an embodiment.
FIG. 2 is a perspective view of a rotor.
3A is an axial cross-sectional view of a rotor, and FIG. 3B is an XX cross-section (a cross section of the rotor on a parting surface P) of FIG.
FIG. 4 is a cross-sectional view of a molding apparatus before molding.
FIG. 5 is a cross-sectional view of the molding apparatus after molding.
FIG. 6 is a cross-sectional view of a conventional molding apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 12 ... Core, 12c ... Slot, 13 ... Winding, 14 ... Commutator, 15a ... Core end surface insulation part, 15c ... Insulation part in slot, 15d ... Insulation base, 15f ... Outer peripheral surface, 21 ... Below as 1st metal mold | die Die, 22 ... Upper mold as a second mold, 23a ... Core end surface molding part, 23c ... Slot inner peripheral surface molding part, 23d ... Base molding part, P ... Parting surface.

Claims (2)

A core having a slot for accommodating a winding is held in first and second molds that are relatively detachably disposed so as to substantially cover the axial end surface of the core and the inner circumferential surface of the slot. A motor core insulating portion molding apparatus comprising a core end surface molding portion and a slot inner circumferential surface molding portion that integrally form an insulating resin to form a core end surface insulating portion and a slot inner insulating portion,
The parting surfaces of the first and second mold a substantially planar intersecting the axis of the set the core, met other than the region for forming the outer peripheral surface of the core end face insulating portion in the core end face molding unit And a motor core insulating part forming apparatus, wherein the apparatus is set at a predetermined position in the axial direction of the core. In the motor core insulating part molding apparatus according to claim 1,
Insulating part molding of a motor core, wherein the mold is integrally provided with a molding part for the base in the molding part for the core end face so as to mold the core end face insulating part integrally provided with the insulating base part of the commutator. apparatus.

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