JPS6152622B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a molded motor that is easy and inexpensive to assemble and has a good finish.

Molded motors, which have a stator core with windings and a molded frame made of resin, use bushings to prevent the resin from flowing out and to prevent the lead wires from being damaged by the mold when pulling out the lead wires from the molded part. It is intended to provide

The bushing is configured to be strongly pressed so that the molding resin injected under high pressure during molding does not eject from the lead wire lead-out portion of the mold.

That is, conventionally, as shown in FIG. 1, the bushing 3 is firmly pressed and gripped by the upper mold 1 and the lower mold 2 to prevent injection of the mold resin injected into the inner side 4 under high pressure.

At this time, resin injection pressure is applied to the bushing 3 from the inside 4 to the outside 5, and the bushing 3 tends to be pushed out to the outside 5.

Therefore, the bushing 3 is firmly pressed by the upper mold 1 and the lower mold 2, and is also formed into a large size so that it can sufficiently withstand the pressing force. It also had to have sufficient frictional force against it.

In addition, if the bushing 3 is pressed and gripped too firmly, after the upper mold 1 and the lower mold 2 are separated and the molded product is extracted, the bushing 3 will expand due to the loss of pressing force, resulting in disadvantages such as poor appearance. It was hot.

Furthermore, there is a problem in that the corners of the upper die 1 and the lower die 2 cause scratches on the bushing 3 and cause formation of glaze lines.

In view of these circumstances, an object of the present invention is to provide a method for manufacturing a molded motor that is easy to assemble, can be manufactured at low cost, and has a good finish by improving the molding die and the configuration of the bushing.

The present invention will be described below based on one embodiment shown in the drawings. FIG. 2 is a diagram showing a molded state of a molded motor according to the present invention and a vertical cross-section of its essential parts.

FIG. 3 is a front view of the main parts seen from the exit line side.

In FIG. 2, the mold consists of an upper mold 6 and a lower mold 7, and a stator core 9 having windings is housed inside 8.

Then, bushing 1 is attached to the lead-out part of the lead wire 10.
1 is provided and held in a recess 12 formed in the divided portion between the upper mold 6 and the lower mold 7.

Furthermore, the end portion 13 of the bushing 11 is covered by protrusions 14 and 15 formed on the upper mold 6 and the lower mold 7.

In FIG. 3, most of the end portion 13 of the bushing 11 is covered by the protrusions 14 and 15 formed on the upper mold 6 and the lower mold 7, and only the lead line 10 is drawn out from the gap.

In such a configuration, a method for manufacturing a molded motor is such that the upper die 6 is heated in a state in which the winding is applied, the lead wire 10 is provided, and the bushing 11 is provided.
and the lower die 7, and the bushing 11 is gripped by the recess 12.

Then, the end portion 13 of the bushing 11 is attached to the protruding portion 1
4 and 15, the cover lead wire 10 is drawn out, and molding resin is injected into the inner side 8 under high pressure.

At this time, the molding resin injected under high pressure is added to the bushing 11, and the bushing 11 is
It tends to be pushed out more toward the end portion 13 side.

However, the end portion 13 of the bushing 11 has protrusions 14 and 15 formed on the upper mold 6 and the lower mold 7.
It can withstand high pressure without moving.

The movement of the bushing 11 is prevented by a recess 12.
This is achieved by the frictional force between the upper mold 6 and the lower mold 7, and because the bushing 11 is covered by the protrusion 13, there is no need to forcibly press the recess 12 to prevent movement, and even after the upper mold 6 and lower mold 7 are separated, the bushing 11 can be held. Problems such as large expansion due to pressure release can be avoided.

Further, it is also possible to alleviate the problem that the bushing 11 has a tortoise pattern at the corner of the molded resin that has hardened due to the expansion of the bushing 11.

Due to these effects, the bushing 11 can be formed into a small size, which is convenient for downsizing, and is also effective in manufacturing at low cost.

In particular, unlike the case where the bushing 11 is held only by the frictional force of the recess 12, the end part 13 is covered and held, so it is easy to select materials without being limited to materials with frictional force or materials that do not shrink or expand. It also has good effects and is convenient to manufacture at low cost.

As explained above, according to the present invention, the bushing used for drawing out the lead line can be made smaller and the finish is also improved, which has great effects.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a main part showing a configuration according to a conventional method, and FIGS. 2 and 3 are a longitudinal cross-sectional view and a front view of a molded motor according to the present invention, and the main part thereof. 1, 6...Upper die, 2,7...Lower die, 10...Leading line, 11...Butching.

Claims (1)

[Claims] 1. In a method for manufacturing a molded motor in which a stator core with windings is molded in resin, a bushing is provided on the lead wire, a part of the bushing is positioned inside the mold so that a part of the bushing is molded, and A method for producing a molded motor, comprising: forming a concave part in a divided part of a mold to grip the remaining part, and further forming a protrusion in the concave part so as to cover the outer end of the bushing, and then molding the bushing. .