JPH0612946B2 - How to put out the mold motor - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a lead-out method for a molded motor, in which a lead-out wire led out from a stator is inserted into a bushing to be exposed to the outside and then molded with a resin.

[Technical Background of the Invention and its Problems] Conventionally, as shown in FIG. 9, a stator 3 formed by mounting a coil 2 on a core 1 is placed in a mating die 6 composed of an upper die 4 and a lower die 5. In the case of the molded motor that is molded by the resin 8 injected from the injection machine 7, the stator 3 in detail, the lead wire 9 led out from the coil 2 is
As shown in FIG. 0, the bushing 10 is sandwiched between the bushings 10 which are formed in a completely divided shape, and the bushing 10 is pressed by the upper die 4 and the lower die 5 of the mating die 6 to press the bushing 10, and then the mating die 6 The resin 8 is injected into the mold to form a lead-out structure for the molded motor. However, in the case where the lead wire 9 is sandwiched between the bushings 10 which are formed in a completely divided shape, the bushing 10 is easily separated, so that it is difficult to set the lead wire 9.

Therefore, as shown in FIG. 11, it is also practiced to use a bushing 11 which is not divided into two. However, in this case, the inner diameter of item 12 of the bushing 11 is the lead wire 9
If the outer diameter of the lead wire 9 is equal to or smaller than the outer diameter of the lead wire 9, it becomes difficult to insert the lead wire 9, so that the inner diameter of the item 12 must be larger than the outer diameter of the lead wire 9. However, in the case of doing so, a gap is formed between the above item 12 and the lead wire 9 in a state where the lead wire 9 is inserted, and the resin 8 leaks from the gap during molding, so that the injection pressure is increased. However, there is a problem in that voids and the like are increased and the appearance after finishing is deteriorated. or,
There is also a problem in that water and moisture enter after being formed through the above-mentioned gaps, which lowers the insulating property of the molded motor.

[Object of the Invention] The present invention has been made in view of the above circumstances. Therefore, an object of the present invention is to easily set and insert a lead wire to a bushing, and to improve the appearance after completion. It is an object of the present invention to provide an excellent method of finding a molded motor that can ensure good insulation of the molded motor.

[Outline of the Invention] The present invention comprises a bushing that is divided into two parts, leaving a part of a thin connecting portion, and a lead wire is inserted into this bushing, and from the bottom portion of the bushing to a portion above the connecting portion. It is housed in the lower mold, and in this state, the upper mold is fitted to the lower mold and the bushing is clamped to squeeze the connecting portion of the bushing to press the lead wire, and in that state resin is injected into the matching mold. The feature is that the bushing is also integrally molded.

[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 those in FIG. 9 are designated by the same reference numerals, and accordingly, in FIG.
Is a core, 2 is a coil, 3 is a stator composed of the core 1 and the coil 2, 4 is an upper mold, 5 is a lower mold, and 6 is a combined mold composed of the upper mold 4 and the lower mold 5. Reference numeral 9 is a lead wire, which is led out from the coil 2 in detail of the stator 3. Reference numeral 13 is a bushing, which is made of an elastic material and has a thin connecting portion (for example, 0.1 mm or less) at a part (intermediate portion in the drawings) as shown in FIGS. 2 to 4. It is divided into two parts with the portion 14 left, and a groove 15 for inserting the lead wire 9 is inserted inside the lead wire 9.
For example, three strips are formed according to the number of. 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 the diameter is gradually increased outward by the small groove portion 15a and the large groove portion 15b. A flap-shaped opening 16 is formed at the outer end.
In addition, a concave portion 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 the above. For such a bushing 13, a lead wire 9
As shown in FIG. 5, each of them is inserted into the groove 15 and, as shown in FIG. 6, from the bottom surface of the bushing 13 to the portion above the connecting portion 14, the mating die 6 is inserted.
The bushing 13 is housed in the bushing housing recess 18 of the lower die 5, and then the upper die 4 is aligned with the lower die 5, so that the bushing 13 is sandwiched between the lower die 5 and the upper die 4. Then, the bushing 13 is tightened as shown in FIGS. 7 and 8 and the thin connecting portion 14 is crushed, so that the lead wire 9 is pressed particularly in the peripheral portion of the small groove portion 15a of the groove 15. In this state, next, resin 8 is injected into the mating die 6 to mold the stator 3, and the bushing 13 is integrally molded. At this time, the portion where the recess 17 of the bushing 13 exists is
The end of the small groove portion 15a of the groove 15 is aligned with the inner surface of the mold and is positioned in the matching mold 6, and in that state, the recess 17 is formed.
The resin 8 is also filled in the inside.

As described above, according to the first embodiment, the bushing 1 in which the connecting portion 14 is partially formed although it is divided into two parts.
3 is used, it is unlikely to be easily separated from the conventional fully-divided bushing 10. Therefore, it is easy to set the lead wire 9, and the conventional bushing 11 which is not bisected at all is used. In comparison with the above, there is a dimensional allowance between the groove 15 and the lead wire 9 in the normal state so that the lead wire 9 can be easily inserted, and in a state where the lead wire 9 is pressed and further molded. Since the bisected portion can be tightened to hold the lead wire 9 and keep it in a state without a gap, the injection pressure can be sufficiently increased without the resin 8 leaking during molding, and thus voids and the like can be generated. It can be eliminated and the appearance after finishing can be improved. Further, since the gap can be eliminated as described above, it is possible to prevent the intrusion of water and moisture into the molded motor, and it is possible to secure good insulation of the molded motor.

Further, since the lower die 5 of the mating die 6 accommodates from the bottom surface of the bushing 13 to a portion above the joint portion 14, it is possible to prevent the bushing 13 from being displaced from the joint portion at the time of die matching. This makes it possible to eliminate the occurrence of gaps more reliably. In addition, since the recess 17 having the inner diameter larger than the outer diameter of the lead wire 9 is formed in the inner portion of the bushing 13 located inside the mating die 6, the resin 8 can be injected and filled therein. In addition, it is possible to more reliably prevent the intrusion of water and moisture. Further, in this case, by aligning the boundary portion between the concave portion 17 and the groove 15 with the position of the inner side surface of the matching mold 6,
It is possible to eliminate the inclination of the bushing 13 and the like, and it is more effective to prevent the occurrence of the gap. Since the groove 15 is formed in the two-step shape of the small groove portion 15a and the large groove portion 15b, the lead wire 9 can be surely held and held by the small groove portion 15a in a state in which the connecting portion 14 is crushed. Therefore, the large groove portion 15b can also be supported and held in an auxiliary manner, so that the deviation of the lead wire 9 can be prevented more reliably. In addition, the thickness of the connecting portion 14 is 0.1 [m
By setting it to be equal to or less than m], it is possible to eliminate the occurrence of a gap 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 peculiar to the above embodiments may be provided only for those requiring them. Other than that, the invention may be appropriately modified and implemented without departing from the scope of the invention.

[Effects of the Invention] As is clear from the above description, the present invention comprises a bushing divided into two parts, leaving a part of a thin connecting portion,
The lead wire is inserted through this bushing, the bottom part of the bushing and the part above the connecting part are accommodated in the lower mold, and in this state, the upper mold is fitted to the lower mold to clamp the bushing, It is characterized in that the joint part is crushed and the lead wire is pressed, and in that state resin is injected into the mating mold to integrally mold the bushing. It has excellent effects such as easy insertion, good appearance after finishing, and good insulation of the molded motor.

[Brief description of drawings]

1 to 8 show a first embodiment of the present invention. FIG. 1 is a vertical sectional side view of a main portion before die matching, FIG. 2 is a vertical sectional side view of a bushing alone, and FIG. FIG. 4 is a front view of the bushing alone as seen from the direction of arrow III in FIG. 4, FIG. 4 is a rear view of the bushing as seen from the direction of arrow IV, and FIG. 5 is a perspective view of the bushing with the lead wire inserted. The figure shows a partial vertical sectional front view of the lower mold housing the bushing in the same state, Fig. 7 is a vertical sectional side view of the main part after the mold matching, and Fig. 8 is an equivalent view of Fig. 6 in the mold matched state. Is. 9 to 11 each show a conventional method, FIG. 9 is a vertical sectional side view of the whole after mold matching, FIG. 10 is an exploded perspective view of a bushing unit, and FIG. 11 is a perspective view of a different bushing unit. Is. In the figure, 3 is a stator, 4 is an upper mold, 5 is a lower mold, 6 is a mating mold, 8 is a resin, 9 is a lead wire, 13 is a bushing, 14
A connecting portion, 15 is a groove, 15a is a small groove portion, 15b is a large groove portion, 17 is a concave portion, and 18 is a bushing accommodating concave portion.

Claims (2)

[Claims] 1. A mold motor in which a stator is molded by a resin injected into a mating mold composed of an upper mold and a lower mold, and a bushing which is divided into two parts except for a thin connecting part is provided. The lead wire led out from the stator is inserted into the bushing, and the portion from the bottom surface of the bushing to the portion above the connecting portion is housed in the lower die.In this state, the upper die is fitted to the lower die to sandwich the bushing. By pressing, the connecting portion of the bushing is crushed to press the lead wire, and in that state, the resin is injected into the mating die so that the bushing is also integrally molded. How to get out. 2. The bushing is provided with a concave portion having a diameter larger than the outer diameter of the lead wire in a portion located in the mating die, and resin is injected and filled in the concave portion. Item 7. A method for finding a molded motor according to item.