JPH0352543A - Manufacture of mold motor stator - Google Patents

Abstract

PURPOSE:To simplify the work of manufacturing by inserting the tip end of the tight fitting part of an insert tap into one of the entrances of the guide hole of a stator core. CONSTITUTION:A loose fitting part 11B at the tip end of the tight fitting part 11A of an insert tap 11 is inserted into two upper entrances among respective guide holes 10 of a stator core 2. After finishing this inserting work, a second mold 4 is put on a first mold 3 and mold clamping is effected. The tight fitting parts 11A of respective insert taps 11 are pressed into the guide holes 10 by a pressure upon the mold clamping. The insert tap 11 is contacted with the second mold 2 closely by the reaction force of the pressing force upon this time while the stator core 2 is pinched and positioned by the insert tap 11 and the positioning pin 8 of the first mold 3. Resin is poured into the molding chamber 5 under this condition to mold the stator core 2. According to this method, the work of preparation may be simplified and the same work may be effected efficiently in a short period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of manufacturing a molded motor stator, in which a stator core having windings is molded with resin.

[Prior Art] In the production of a conventional molded motor stator, as shown in FIG.
This was done by setting the outer periphery of the core metal 6 in the molding chamber 5 between the molding chamber 5 and the second mold 4, and then injecting the resin 7 into the molding chamber 5 and molding.

Conventionally, when the stator core 2 is integrally molded, pressure between the stacked layers of the stator core 2 and vertical positioning are performed using positioning pins 8 protruding from the inner surfaces of each of the first mold 3 and the second mold 4. and the positioning pin 9 into the guide hole 1 of the stator core 2.
This was done by holding it in place so as to cover the 0 part.

In some cases, insert taps or insert studs are fixed to the inner surfaces of both molds 3 and 4 for positioning.

[Problem to be Solved by the Invention] In the former case, the positioning accuracy of each positioning pin 8.9 is finished with high accuracy, but these positioning pins 8.9
Since the stator core 2 positioned between them is a pressed laminated product, there are large variations in the laminated dimensions, and if it is too thick, it may damage the molds 3 and 4 or deform the stator core 2, or if it is too thin, the stator core 2 There were problems such as the position being inconsistent. In order to avoid this, it is necessary to select the laminates within the usable size range by a method such as sorting the laminates, which is a problem that requires a lot of effort and time.

Further, in the latter case, it is necessary to fix the insert tap or the insert stud to each of the molds 3 and 4, which takes time for preparation and has the problem of poor workability.

An object of the present invention is to provide a method for manufacturing a molded motor stator, which allows positioning regardless of variations in the thickness of the stator core and allows efficient preparatory work.

[Means for Solving the Problems] To explain the means of the present invention for achieving the above object, the present invention provides a structure in which a stator core having windings is placed between a first mold and a second mold. In the method for manufacturing a molded motor stator in which a molded motor stator is obtained by setting the core metal on the outer periphery in a molding chamber, and then injecting resin into the molding chamber and molding, the first and second molds include One of the molds has a positioning pin protruding from its inner surface, and the other mold does not have a positioning pin protruding from it, and the stator core is set in the molding chamber before or after the stator core is set in the molding chamber. Insert the tip of the interference fit part of the insert tap or insert stud into one entrance of the guide hole of the stator core, and make sure that the insert tap or insert stud is located in the mold that does not have the positioning pin. Press-fitting the tight fitting portion of the insert tap or insert stud into the guide hole using mold clamping pressure of the first and second molds, and clamping the stator core between the insert tap or insert stud and the positioning pin. The resin is injected into the molding chamber in this state.

[Function] When the tip of the tight fitting part of the insert tap or insert stud is inserted into the entrance of one of the guide holes of the stator core in this way, the preparation is simply a work of fitting the insert tap or insert stud into the guide hole, Preparation work can be done efficiently and in a short time. In addition, the insert tap or insert stud inserted into the guide hole of the stator core is press-fitted into the guide hole by mold clamping pressure, and the reaction force of this press force causes the insert tap or insert stud to be inserted into the metal plate that does not have a positioning pin. The stator core can be positioned by the positioning pin of the mold which is in close contact with the inner surface of the mold and has the insert tap or insert stud and the positioning pin.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention. As shown in the figure, in this embodiment, positioning pins 8 are provided on the inner surface of the first mold 3, but the positioning pins 8 are provided on the inner surface of the first mold 3.
There are no positioning pins on the inner surface. Instead,
At least two of each guide hole 10 of stator core 2
The clearance fit part 11B at the tip of the interference fit part 11A of the insert tap 11 is inserted into each of the two upper holes.

After the insertion work of the insert tap 11 is completed, the second mold 4 is placed over the first mold 3 and the mold is clamped. The tight fitting portion 11A of each insert tap l1 is press-fitted into the guide hole 10 by the mold clamping pressure at this time. Due to the reaction force of the pressing force at this time, the insert tap 11 comes into close contact with the second mold 2, and the insert tap ■1 and the first mold 3
The stator core 2 is held and positioned by the positioning pins 8 . In this state, resin 7 is injected into the molding chamber 5, and the stator core 2 is molded.

FIG. 3 shows a second embodiment of the invention. This embodiment shows an example in which an insert stud 12 is used in place of the insert tap 1. In addition,
12A is an interference fit portion of the insert stud 12;
2B is a clearance fit portion of the insert stud 12. In this case, the insert stud 12 is attached to the mold resin 7.
Since it is necessary to protrude from the surface of the second mold 4, it is necessary to provide a fitting hole 3 in advance on the inner surface of the second mold 4, into which the head of the insert stud 12 is fitted. If this is done, there is a risk that the resin 7 will enter the gap between the fitting hole l3 and the insert stud 12 therein, so a large diameter portion 12G is provided in the middle of the insert stud 12, It is preferable that the diameter portion 12C closes the gap at the entrance of the fitting hole 13.

In the above embodiment, the first mold is provided with a positioning pin and the second mold is not provided with a positioning pin, but the present invention is not limited to this, and the first mold Of course, the positioning pin may not be provided in the second mold, but the positioning pin may be provided in the second mold, and the insert tap or insert stud may be inserted into the entrance of the guide hole on the second mold side. .

[Effects of the Invention] As explained above, the method for manufacturing a molded motor stator according to the present invention includes a method of inserting the tip of the tight fitting portion of the insert tap or insert stud into one entrance of the guide hole of the stator core as a preliminary preparation. This has the advantage that preparatory work can be done easily, efficiently, and in a short time. In addition, the insert tap or insert stud inserted into the guide hole of the stator core is pressed into the guide hole by mold clamping pressure, and the reaction force causes the insert tap to come into close contact with the inner surface of the mold that does not have the positioning pin. However, the stator core can be positioned using the insert tap or insert stud and the positioning pin of the mold having the positioning pin. Furthermore, positioning using such an insert tap or insert stud has the advantage that positioning can be performed without being affected by variations in the thickness of the stator core.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a first embodiment of a mold used to manufacture a molded motor stator according to the present invention, and FIG. 2 shows a state in which an insert tap is inserted into a guide hole of a stator core in this embodiment. FIG. 3 is a longitudinal sectional view of the main part inside the mold in the second embodiment of the present invention, and FIG.
The figure is a vertical cross-sectional view of a mold during manufacturing of a conventional molded motor stator. DESCRIPTION OF SYMBOLS 1... Winding wire, 2... Stator core, 3... First mold, 4... Second mold, 5... Molding chamber, 6...
Core metal, 7... Resin, 8... Positioning pin, 9...
Positioning pin, 10...Guide hole, 11...Insert tap, 11A...Tight fit part, 1lB...
Clearance fitting part, 12... Insert stud, 12A
... Tight fit part, 12B... Clearance fit part, 12
C...Large diameter part. Figure 1 Figure 4

Claims (1)

[Claims] A stator core with windings is set on the outer periphery of a core metal in a molding chamber between a first mold and a second mold, and then resin is injected into the molding chamber and molded to form a molded motor stator. In the method for manufacturing a molded motor stator, a positioning pin is protruded from the inner surface of one of the first and second molds, and a positioning pin is protruded from the other mold. Before or after setting the stator core in the molding chamber, insert the tip of the interference fit part of the insert tap or insert stud into one entrance of the guide hole of the stator core, and insert the insert tap or The insert stud is located in the mold that does not have the positioning pin, and the tight fitting portion of the insert tap or insert stud is inserted into the mold using the mold clamping pressure of the first and second molds. A method for manufacturing a molded motor stator, comprising press-fitting a resin into a guide hole and injecting a resin into the molding chamber while the stator core is held between the insert tap or the insert stud and the positioning pin.