JPS61240839A - Wire leading method for molded motor - Google Patents

Abstract

PURPOSE:To mold a bushing integrally, by a method wherein after a lead wire is inserted through the bushing, the jointing sections of the bushing are crushed and the lead wire is pressed down, and wherein in the state, resin is injected into the united mold. CONSTITUTION:A section from the bottom section in particular to the upper section through jointing sections 14 of a bushing 13 is contained in a bushing containing concave mold 18 provided for the lower mold 6, and after that, by uniting the lower mold 5 with an upper mold 4, the bushing 13 is pressed between the lower mold 5 and the upper mold 4. Then, the bushing 13 is tightened and the thin jointing sections 14 are crushed, and as a result, a lead wire 9 is pressed down on the peripheral section of the small groove section 15a of a groove 15 in particular, and in this state, after that, resin 8 is injected into the united mold 6 to mold a stator 3, and the bushing 13 is molded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a lead-out method for a molded motor in which lead wires led out from a stator are passed through a bushing and brought out to the outside, and then molded with resin at F.

[Technical background of the invention and its problems] Conventionally, as shown in FIG. In a molded motor that is molded with resin 8 injected from an injection machine 7, the stator 3, specifically the lead wire 9 led out from the coil 2, is
As shown in FIG. The resin 8 is injected into the mating mold 6 to form a mold motor opening structure. However, in the case where the lead wire 9 is sandwiched between the bushings 10 formed in a completely split shape, there is a problem that it is difficult to set the lead wire 9 because the bushing 10 is easily separated.

Therefore, as shown in FIG. 11, a bushing 11 that is not divided into two is used.

However, in this case, if the inner diameter of the hole 12 of the bushing 11 is the same as or smaller than the outer diameter of the lead wire 9, it will be difficult to insert the lead wire 9, and therefore the inner diameter of the hole 12 will be smaller than the lead wire 9. It has to be larger than the outer diameter of wire 9. However, in the case of such a device, a gap is created between the hole 12 and the lead wire 9 when the lead wire 9 is inserted, and the molded special resin 8 leaks from the gap, resulting in an increase in the injection pressure. First, there was a problem in that the appearance of the finished product was poor due to the increased occurrence of voids and the like. Further, condensate water and moisture infiltrate through the above-mentioned gaps, resulting in a problem in that the insulation properties of the molded motor deteriorate.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and therefore, its purpose is to easily set and insert the lead wire into the bushing, and to have a good appearance after completion. To provide an excellent method for opening a molded motor, which can also ensure good insulation of the molded motor.

[Summary of the Invention] The present invention includes a bushing that is divided into two parts, leaving a part of a thin connecting part, and inserting a lead wire into this bushing, and compressing the bushing with a mating mold to open the connecting part. The feature is that the bushing is molded integrally with the bushing by crushing and pressing the lead line, and injecting resin into the mating mold in this state.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 to 8. First, in Fig. 1, the same parts as in Fig. 9 are shown with the same reference numerals.
2 is a core, 2 is a coil, 3 is a stator consisting of the core 1 and the coil 2, 4 is an upper mold, 5 is a lower mold, and 6 is a combined mold consisting of the upper mold 4 and the lower mold 5. Further, 9 is a lead wire, which is led out from the stator 3, more specifically, the coil 2. Reference numeral 13 denotes a bushing, which is made of an elastic material, and as shown in Figs. It was divided into two parts, leaving part 14.
Inside, for example, three strips are formed to match the number of the lead wires 9 for insertion of the lead wires 9. here,
The groove 15 is vertically larger than the outer diameter of the lead wire 9 in the normal state of the bushing 13, and gradually increases in diameter toward the outside by the small full part 15a and the large groove part 15b,
A wedge-shaped opening 16 is formed at its outermost end. Further, a recess 17 having an inner diameter sufficiently larger than the outer diameter of the lead wire 9 is formed in the inner portion of the groove 15 opposite to that described above. For such a bushing 13, each lead wire 9 is inserted into the groove 15 as shown in FIG.
Then, as shown in FIG. 6, the bushing 13, especially the bottom part to the part above the connecting part 14, is accommodated in the bushing housing recess 18 of the lower mold 5 of the mating mold 6, and then the upper mold 4 is inserted. By fitting the bushing 13 with the lower mold 5, the bushing 13 is compressed by the lower mold 5 and the upper mold 4.

Then, the bushing 13 is tightened as shown in FIGS. 7 and 8, and the thin connecting portion 14 is crushed, thereby pressing down the lead wire 9, especially around the small groove portion 15a of @15. In this state, resin 8 is then injected into the mating mold 6, and the stator 3 is molded, and the bushing 13 is also integrally molded. At this time, the portion of the bushing 13 where the concave portion 17 exists is located in the mating mold 6 with the end of the small full portion 15a of the groove 15 matching the inner surface of the mold, and in this state, the resin is also filled in the concave portion 17. 8 is injected and filled.

As described above, according to the bookcase-embodiment, the bushing 1 has a part that is the connecting part 14 even though it is divided into two parts.
3, unlike the conventional bushing 10 which is completely divided into two parts, it does not easily come apart, and therefore the lead wire 9 can be easily set. Compared to this, there is normally a dimensional margin between the groove 15 and the lead wire 9, making it easy to insert the lead wire 9, and when it is pressed by the mating mold 6 and further molded. Since the divided parts are tightened and the lead wire 9 can be held in a state without any gaps, the resin 8 will not leak during molding, and the injection pressure can be sufficiently increased, thereby preventing the occurrence of voids, etc. It can be eliminated and the appearance after completion can be improved. Furthermore, since the gap can be eliminated as described above, it is also possible to eliminate the intrusion of water and moisture into the molded motor, and it is possible to ensure good insulation of the molded motor.

In addition to the above, especially in the first embodiment, since the lower mold 5 of the mating mold 6 accommodates the bottom part of the bushing 13 to the part above the connecting part 14, It is possible to prevent the bushing 13 from slipping off from the connecting portion during mold matching, and the generation of gaps can be more reliably eliminated. In addition, bushing 1
There is a lead line 9 on the inner part located within the mating mold 6 of 3.
Since the recess 17 has an inner diameter larger than the outer diameter of the recess 17, the resin 8 can be injected and filled into the recess 17, thereby more reliably preventing water, moisture, etc. from entering. Furthermore, in this case, by aligning the boundary between the recess 17 and the groove 15 with the inner surface of the mating mold 6, it is possible to eliminate the inclination of the bushing 13, which further helps prevent the above-mentioned gap from occurring. be effective. And groove 1
By configuring 5 in a two-stage shape with a small groove part 15a and a large groove part 15b, it is possible to reliably hold and hold the lead wire 9 with the small full part 15a in a state where the connecting part 14 is crushed. The large groove portion 15b can also be used as an auxiliary press and hold, thereby making it possible to more reliably prevent the lead line 9 from shifting. Also, the thickness of the connecting portion 14 is set to 0.1 [m
l] or less, it is also possible to eliminate the generation of gaps when it is crushed.

However, the present invention is not limited to the embodiments described above and shown in the drawings, and therefore various considerations specific to the embodiments described above may be included only if necessary. Other changes may be made as appropriate without departing from the spirit of the invention.

[Effects of the Invention] As is clear from the above description, the present invention includes a bushing that is divided into two parts, leaving a part of a thin connecting part,
The lead wire is inserted through this bushing, and the bushing is compressed by a mating mold to crush the connecting part and press the lead wire.In this state, resin is injected into the mating mold and the bushing is integrally molded. This makes it easy to set and insert the lead wire into the bushing, and it also has a good appearance after completion, and also ensures good insulation of the molded motor. It has excellent effects.

[Brief explanation of the drawing]

1 to 8 show a first embodiment of the present invention, FIG. 1 is a vertical cross-sectional side view of the main part before mold matching, FIG. 2 is a vertical cross-sectional side view of the bushing alone, and FIG. Fig. 4 is a rear view of the bushing as seen from the arrow ■ direction in the figure, Fig. 5 is a perspective view of the bushing with the lead wire inserted through it, Fig. 6 The figure is a partial longitudinal sectional front view of the lower mold housing the bushing in the same state.
FIG. 7 is a longitudinal sectional side view of the main part after the molds have been matched, and FIG. 8 is a view equivalent to FIG. 6 in a state where the molds have been matched. and the ninth
9 to 11 show the conventional method, FIG. 9 is a longitudinal sectional side view of the whole after mold matching, FIG. 10 is an exploded perspective view of a single bushing, and FIG. 11 is a perspective view of a different single bushing. In the figure, 3 is a stator, 4 is an upper mold, 5 is a lower mold, 6 is a mating mold, 8 is resin, 9 is a lead wire, 13 is a bushing, 14
15 is a connecting portion, 15 is a groove, 15a is a small groove, 15b is a large groove, 17 is a recess, and 18 is a bushing accommodation recess. Applicant Toshiba Corporation Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 1 Co-cutting No. 90 Fig. 10 Fig. 11

Claims (1)

[Scope of Claims] 1. A molded motor in which the stator is molded with resin injected into a mating mold, comprising a bushing that is divided into two parts with a thin joint part remaining, and this bushing has the above-mentioned parts. The lead wire led out from the stator is inserted, and the bushing is compressed by the mating mold to crush the connecting part and press the lead wire. In this state, the resin is injected into the mating mold and the bushing is closed. A method for opening a molded motor, characterized in that the motor is integrally molded. 2. Claim 1, characterized in that the mating mold consists of an upper mold and a lower mold, and the lower mold accommodates the bushing from the bottom part to the part above the connecting part. How to open the molded motor as described in section. 3. The bushing is provided with a recess larger than the outer diameter of the lead wire in the portion located in the mating mold, and the resin is injected and filled into the recess, as set forth in claim 1. How to open a molded motor.