JP3552266B2 - Mold motor mold - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a mold motor mold for molding a resin.
[0002]
[Prior art]
Conventionally, in this type of mold motor, the gas generated from the resin during molding remains in the mold without escaping and the resin frame surface is not filled, or the accuracy of roundness is reduced because the bearing part is not filled There was a problem of doing. In order to solve such a problem, conventionally, a mold motor mold having a configuration as shown in FIG. 7 has been known. Hereinafter, the description will be given.
[0003]
FIG. 7 is a side sectional view of a conventional mold motor mold, and FIG. 8 is an enlarged side sectional view of the main part. The stator core 4 is wound inside a space 3 formed by an upper mold 1 and a lower mold 2. The resin 6 is injected from the gate port 7 in a state in which the mounted coil 5 is accommodated, and a resin pool portion 8 is provided at a position opposite to the gate port 7. In the case of this configuration, since the flow of the resin 6 is in one direction, the accuracy of the roundness of the bearing portion of the frame 9 cannot be ensured, and the metal housing 10 is required. Further, as shown in FIG. 8, the injection pressure of the resin 6 causes the coil 5 to be deformed, so that the insulation distance 11 from the metal housing 10 cannot be ensured. There was a problem of getting up.
[0004]
In order to solve the above-mentioned problem, a configuration as shown in FIGS. 9 to 13 is known. FIG. 9 is a side sectional view of another conventional molded motor mold, FIG. 10 is an enlarged side sectional view of the same main part, FIG. 11 is a side sectional view of a main part of a molded product of another conventional molded motor mold. FIG. 12 is a perspective view of another conventional molded product. In FIG. 9, a resin 6 is injected from a gate port 7 in a state where a coil 5 wound around a stator core 4 is accommodated in a space 3 formed by an upper mold 1 and a lower mold 2. The upper mold 1 is provided with a through hole 12 for venting gas.
[0005]
In the case of this configuration, there is an advantage that the housing 13 can be formed by the frame 9. However, as shown in FIGS. 10 and 11, the resin 6 injected from the gate port 7 joins the upper mold 1 and the intermediate shaft 14. The gas which flows into the narrow groove 15 and is hardened, and the gas generated during molding does not escape, and the unfilled portion 16 of the housing 13 of the frame 9 frequently occurs as shown in FIG. There is a problem that the accuracy of the roundness cannot be ensured due to the unfilled state. Further, as shown in FIG. 11, the resin film 18 which has hardened and adhered to the narrow groove 15 of the upper mold 1 can be easily removed. However, no consideration has been given to means for preventing the above problems from occurring intermittently.
[0006]
[Problems to be solved by the invention]
That is, FIG. 13 is a schematic side sectional view showing another conventional molding method for a mold motor mold. In the molding, the upper mold 1 is continuous on one surface and the lower mold 2 is continuous molding on two surfaces. Therefore, when the molding is interrupted to remove the resin film 18 attached to the narrow groove 15 of the upper mold 1, there is a problem that the number of products to be produced decreases.
[0007]
Therefore, the present invention solves the above-mentioned problem, and can be formed by improving the accuracy of the roundness of a bearing portion of a molded motor by using a molding resin, and easily removing gas in a mold to unfill the surface of the molded motor. It is an object of the present invention to provide a mold motor mold capable of preventing the occurrence of the problem.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a double structure of an intermediate shaft for holding a stator core wound with a coil, and a hollow fixing screw for fixing one intermediate shaft to the other intermediate shaft. A resin puddle for removing gas generated during molding is provided above the fixing screw , and the resin cured in the resin puddle is protruded and removed from the fixing screw by protruding a pin . In addition, a gas vent portion is provided at the center of the intermediate shaft for improving the accuracy of the roundness of the bearing portion of the resin frame, and the resin pressure-injected from a plurality of gate ports is vented by the gas vent portion. And
[0009]
[Action]
In the above configuration, by providing a resin pool portion above the fixing screw and making it hollow, excess mold resin that has flowed in from a plurality of gate ports and that has been finally filled in the central portion can accumulate in the resin pool portion. The accumulated resin can be easily taken out with a protruding pin by making the fixing screw hollow. Further, the generated gas in the mold resin is also concentrated at the central portion. However, by making the fixing screw hollow together with the resin pool portion above the fixing screw, the generated gas can be easily discharged to the outside of the mold.
[0010]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of a molded motor according to one embodiment of the present invention, FIG. 2 is a side sectional view of a molded motor mold according to one embodiment of the present invention, FIG. FIG. 5 is a cross-sectional view of a protruding side of a molded product of a molded motor mold according to an embodiment of the present invention. FIG. 5 is a cross-sectional view of a main part of the molded motor mold according to an embodiment of the present invention. It is a side sectional view of an important section of an intermediate shaft of an example. In the following description, the same components as those of the above-described conventional example are denoted by the same reference numerals.
[0011]
In FIG. 1, a stator core 4 and a coil 5 wound around the stator core 4 are integrally molded with a frame 9 made of synthetic resin. A ball bearing 21 is mounted on the open end of the frame 9 and the housing 20, and a rotating shaft 23 of a rotor 22 is pivotally supported.
[0012]
2 and 3, the lower mold 2 is screwed by an inner shaft 25 fixed by a first lower mold 2a and a second lower mold 2b, and an inner shaft fixing screw 27 to the inner shaft 25. An outer intermediate shaft 26 to be fixed, a protruding pin 28 for taking out a molded product, and protruding pin holding plates 29 and 30 are formed. The lower mold 2 contains the stator core 4 and the coil 5. In this state, the upper mold 1 is joined to the lower mold 2, and the resin 6 is injected under pressure from the gate port 7 and heated for a certain time. When cured, the molded product is completed.
[0013]
The intermediate shaft fixing screw 27 is hollow, has a through hole 12 for degassing at the center, and a resin reservoir 31 (FIG. 4) at the upper part. The resin reaches the resin pool portion 31 through the narrow groove 15 (FIG. 3) at the upper part 27. Further, the generated gas is released from the through-hole 12 to the outside of the mold.
[0014]
In the above configuration, as shown in FIGS. 4 and 5, the resin 6 that has flowed into the resin pool portion 31 is cured during the heating and curing time of molding, and can be easily removed with the protruding pins 28 when removing the molded product. As a result, continuous stable molding without unfilling can be maintained without remaining in the resin pool portion 31 of the intermediate shaft fixing screw 27.
[0015]
Further, as shown in FIG. 6, the resin film 18 in the narrow groove 15 above the outer intermediate shaft 26 can be easily removed by the air blow 32, so that the continuous and stable molding can be maintained as described above. By providing the through hole 12 for gas release and the resin reservoir 31 in the center of the intermediate shaft fixing screw 27, the resin 6 pressure-injected from the plurality of gate ports 7 can be degassed at the center. A bearing having high roundness can be obtained.
[0016]
【The invention's effect】
As described above, according to the present invention, unfilling in the vicinity of the central portion of the molded product is prevented, whereby the accuracy of the roundness of the bearing portion of the molded product can be improved, and the molding quality of the molded product is reduced. As a result, it is possible to obtain a molded motor with improved productivity.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a molded motor according to one embodiment of the present invention; FIG. 2 is a sectional side view of a molded motor mold according to one embodiment of the present invention; FIG. FIG. 4 is an enlarged side cross-sectional view of a main part of a mold. FIG. 4 is a cross-sectional view of a protruding side of a molded product of a molded motor mold according to one embodiment of the present invention. FIG. 6 is a side sectional view of a main part of an intermediate shaft according to one embodiment of the present invention. FIG. 7 is a side cross sectional view of a conventional mold motor mold. FIG. 8 is an enlarged main part of a conventional mold motor mold. FIG. 9 is a side sectional view of another conventional molded motor mold. FIG. 10 is an enlarged side sectional view of a main part of another conventional molded motor mold. FIG. 11 is another conventional molded motor mold. FIG. 12 is a side sectional view of a main part of a molded product of FIG. 12 which is a perspective view of another conventional molded product. Schematic side cross-sectional view showing a molding method of the molded motor die come EXPLANATION OF REFERENCE NUMERALS
REFERENCE SIGNS LIST 1 upper mold 2 lower mold 3 space 4 stator core 5 coil 6 resin 7 gate port 12 through hole 25 inner intermediate shaft 26 outer intermediate shaft 27 intermediate shaft fixing screw 31 resin pool

Claims (2)

A mold motor mold for molding a resin frame by injecting a resin into the space in a state where a coil wound around a stator core is accommodated in a space formed by a pair of molds, wherein the coil is wound. The intermediate shaft for holding the mounted stator core has a double structure, and a fixing screw for fixing one intermediate shaft to the other intermediate shaft is hollow, and gas generated during molding is removed above the fixing screw. Wherein the resin cured in the resin pool portion is protruded and removed from the fixing screw by projecting a pin . In order to improve the accuracy of the roundness of the bearing portion of the resin frame formed by the intermediate shaft, a gas vent portion is provided at the center of the intermediate shaft, and the resin that has been pressure-injected from a plurality of gate ports is supplied to the gas vent portion. 2. The mold motor mold according to claim 1, wherein the gas is vented by the following .

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