JPH0759309A - Manufacture of molded motor - Google Patents

Abstract

PURPOSE:To prevent easily water from penetrating from the inner peripheral surface of the through bolt hole of a stator core into the stator core, by forming in the through bolt hole a notched groove having its opening in the outer peripheral part of the stator core, and by passing a resin through the notched groove, and further, by molding simultaneously with the resin the inner peripheral surface of the through bolt hole together with the housing of the stator core. CONSTITUTION:In a through bolt hole 3 of a stator core 1, a notched groove 10 having its opening in the outer peripheral part of the stator core 1 is formed. Thereby, when the housing of the stator core 1 is molded with a resin 5 in the state wherein a through pin is passed through the through bolt hole 3, the resin 5 is made to flow in the through bolt hole 3 smoothly from the notched groove 10 formed in the outer peripheral part of the stator core 1. Thereby, when the housing of the stator core 1 is molded the inner peripheral surface of the through bolt hole 3 can be molded simply and surely too, and water can be prevented easily from penetrating from the inner surface of the through bolt hole 3 into the stator core 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a molded motor.

[0002]

2. Description of the Related Art A conventional technique is shown in FIGS. In both figures, reference numeral 1 denotes a stator core, which is formed by laminating a plurality of thin steel plates 2 and has a through bolt hole 3 in the axial direction. Four
Are formed on the inner peripheral portion of the stator core 1 by teeth. Reference numeral 5 denotes a resin, which is molded on the outer cover of the stator core 1 excluding the tips of the teeth 4. 6 is a spigot portion made of the resin, and 7 is a bracket, which is fitted and fixed to the spigot portion 6. A through bolt 8 passes through the through bolt hole 3 of the stator core 1 and clamps and fixes the stator core 1 by the bracket 7 and a bracket on the opposite side (not shown). The resin 7 is injected into the stator core 1 by injection molding.
Was molded into the outer cover of the stator core 1 to protect the stator core 1 from the outside atmosphere and water.

[0003]

[Problem to be Solved by the Invention] Resin 5 is stator core 1
It is necessary to mold not only the outer peripheral portion of the through bolt hole 3 but also the inner peripheral portion of the through bolt hole 3. However, since the through bolt hole 3 has a small inner diameter, it is necessary to reduce the thickness of the resin molded on the inner peripheral surface. However, conventionally, the inner peripheral surface of the through bolt hole 3 is molded by a narrow gap between the inner peripheral surface of the resin through bolt hole 3 and the through pin (not shown) from the axial end surface side of the stator core 1. Since the resin was not poured into the through bolt hole 3, the resin could not sufficiently flow into the through bolt hole 3, and the inner peripheral surface of the through bolt hole was not sufficiently molded. Therefore, there is a problem in that water enters the through bolt holes 3 by the end face of the spigot portion 6 and water enters inside from between the groove plate steel plates 2 of the stator core 1. Therefore, conventionally, after the outer cover of the stator core 1 is molded, the inner peripheral surface of the through bolt hole 3 is further impregnated with the sealing material 9 so that water does not enter between the thin steel plates 2. There was a problem that the number of processes increased. The present invention has been made to solve such a problem, and provides a method of manufacturing a molded motor that can easily and reliably prevent water from entering from the inner peripheral surface of the through bolt hole 3. It is intended to be provided.

[0004]

In order to achieve this object, according to the present invention, a plurality of thin steel plates are laminated, and a jacket of a stator core having through bolt holes in the axial direction is molded with resin. In the method for manufacturing a molded motor, the stator core is formed by forming a notch groove that opens in the outer peripheral portion of the stator core in the through bolt hole and injecting resin into the through bolt hole from the notch groove. The inner peripheral surface of the through bolt hole is simultaneously molded with resin together with the outer cover.

[0005]

With the above-mentioned means, when the outer cover of the stator core is molded, the inner peripheral surface of the through bolt hole can be easily and surely molded, so that water does not enter from the inner peripheral surface of the through bolt hole. Easily prevented.

[0006]

Embodiments of the present invention will be described below with reference to FIGS. The through bolt hole 3 of the stator iron core 1 is formed with a notch groove 10 that opens to the outer peripheral portion of the stator iron core 1. Therefore, the through pin 11 is inserted into the through bolt hole 3.
When the outer cover of the stator core 1 is molded with the resin 5 in a state of passing through, the resin smoothly flows into the through bolt holes 3 from the notch groove 10 in the outer peripheral portion of the stator core 1. Therefore, the stator core 1 can surely mold the resin 5 on the inner peripheral surface of the through bolt hole 3 when the resin 5 is molded on the outer cover. Further, since the resin 5 smoothly flows into the through bolt hole 3, it is not necessary to increase the injection pressure at the time of injection molding. The dimension A of the opening of the cutout groove 10 is set to the thickness dimension B of the resin formed on the inner peripheral surface of the through bolt hole 3, that is, the inner peripheral surface of the through bolt hole 3 and the through pin 1.
If it is set to be larger than the narrow space between the resin 1 and 1, the resin 5 can flow into the through bolt hole 3 more smoothly, and the inflow speed of the resin from the gate to the counter gate can be increased during injection molding. .

[0007]

As described above, according to the present invention, the inner peripheral surface of the through bolt hole can be easily and surely molded when the outer cover of the stator core is molded. Water can easily be prevented from entering from the inner peripheral surface of the hole.

[Brief description of drawings]

FIG. 1 is a partial front sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a partial plan view showing a main part of a stator core according to the present invention.

FIG. 3 is a partial front sectional view showing a conventional example.

FIG. 4 is a partial side sectional view taken along the line CC of FIG.

[Explanation of symbols]

 1 Stator Core 2 Thin Steel Plate 3 Through Bolt Hole 4 Teeth 5 Resin 6 Inlay Part 7 Bracket 8 Through Bolt 9 Sealing Material 10 Notch Groove 11 Through Pin

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[Procedure amendment]

[Submission date] August 3, 1994

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Title: Molded motor manufacturing method

Claims (1)

[Claims] 1. A method of manufacturing a molded motor, comprising laminating a plurality of thin steel plates and molding an outer cover of a stator core having through bolt holes in the axial direction with resin, wherein the stator is provided in the through bolt holes. By forming a notch groove that opens in the outer peripheral portion of the iron core and injecting resin into the through bolt hole from this notch groove, the outer peripheral surface of the stator core and the inner peripheral surface of the through bolt hole are made of resin at the same time. A method of manufacturing a molded motor, which comprises molding.