JP3651339B2 - Manufacturing method of stator for flywheel magneto - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a flywheel magneto stator that generates electricity by attaching a rotor to a rotating shaft of an internal combustion engine or the like.
[0002]
[Prior art]
As shown in FIGS. 9 to 11, the conventional flywheel magneto stator includes a stator core 1 having a plurality of convex poles 1b radially on the outer periphery of the annular portion 1a, an outer peripheral surface of the annular portion 1a, and each convex pole 1b. The resin mold bobbin 2 provided by injection molding on the peripheral surface of the metal plate, the power generation coil 3 wound around the outer periphery of each convex pole 1b via the resin mold bobbin 2, and the resin mold bobbin on the outer peripheral surface of the annular portion 1a 2 is inserted into a hole 4 provided in the annular portion 1a at a part where the part 2 is provided, and is electrically insulated and mechanically supported by filling the resin constituting the resin mold bobbin 2. And a pair of cord holding pins 6 erected by the resin constituting the resin mold bobbin 2 at a portion where the resin mold bobbin 2 is partially provided on the outer peripheral surface of the annular portion 1a. It has been made. The power generating coil 3 includes an exciter coil 3A that obtains energy for ignition of the internal combustion engine, a lamp coil 3B that obtains output for battery charging, and the like. The ends of the power generation coils 3 are electrically connected to the terminal pins 5 by soldering, and the terminal pins 5 are electrically connected to the cords 7 for extracting the power generation output by soldering. These cords 7 are gathered as a wire harness 8 and pulled out to the outside. The wire harness 8 is fixed to the empty convex pole 1b by a cord clamp 9. The terminal pin 5 is provided with a retaining protrusion 5a.
[0003]
In such a flywheel magneto stator, before the power generating coil 3 is wound around each convex pole 1b, the outer peripheral surface of the annular portion 1a of the stator core 1 and the peripheral surface of each convex pole 1b as shown in FIG. It is necessary to provide the resin mold bobbin 2 by injection molding. When molding the resin mold bobbin 2, it is necessary to form terminal pin insertion holes 10 for inserting the terminal pins 5 into the resin mold bobbin 2. When the resin mold bobbin 2 is molded, the terminal pin insertion hole 10 is arranged at a position where the terminal pin insertion hole 10 is formed in the bobbin molding die, and the formed resin is placed in the bobbin molding die. When the resin mold bobbin 2 is molded by injection, it is formed together.
[0004]
[Problems to be solved by the invention]
However, in the conventional flywheel magneto stator and the manufacturing method thereof, when the thickness of the stator core 1 increases as the power generation output is increased, the terminal pin insertion hole 10 is pushed by the resin pressure at the time of molding. There is a problem that it cannot be formed straight because it is inclined to the weaker side. That is, if the terminal pin insertion hole 10 is inclined, when the terminal pin 5 is inserted into the terminal pin insertion hole 10, the terminal pin 5 comes into electrical contact with the stator core 1, and the resin mold The bobbin 2 cannot be supported in an electrically insulated state, resulting in poor insulation.
[0005]
The objective of this invention is providing the manufacturing method of the stator for flywheel magneto which can prevent the insulation defect of a terminal pin.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, a power generation coil is wound around the stator iron core via a resin mold bobbin, and a terminal pin insertion hole is provided at a location where the resin of the resin mold bobbin exists. In the manufacturing method of the flywheel magneto stator in which the terminal pin is inserted and supported in an electrically insulated state,
When molding the resin mold bobbin by setting the stator iron core on the bobbin mold, the terminal pin insertion hole mold is disposed at the location where the terminal pin insertion hole is to be formed. The bobbin mold is provided with a positioning portion for positioning the terminal pin insertion hole mold on the side opposite to the surface receiving pressure, and a mold resin is injected into the bobbin mold .
[0007]
In such a flywheel magneto stator manufacturing method, when the terminal pin insertion hole forming die is formed, the terminal pin insertion hole forming is performed on the side opposite to the surface where the terminal pin insertion hole forming die receives pressure during resin injection. Since the mold is positioned by the positioning portion, the terminal pin insertion hole forming die is positioned by being pressed against the positioning portion by the pressure at the time of resin injection, and therefore it is possible to prevent the terminal pin insertion hole forming die from being inclined during molding.
[0008]
In the obtained flywheel magneto stator, a portion where the positioning portion was present in a part of the resin mold bobbin remains as a positioning portion insertion recess. Further, in the flywheel magneto stator, without also inserting the terminal pin to the terminal pin insertion holes are in electrical contact with the stator core, as possible out to prevent the poor insulation of the terminals pins.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 to FIG. 3 show a first example of an embodiment of a flywheel magneto stator and a method for manufacturing the same according to the present invention. FIG. 1 shows a main configuration of the flywheel magneto stator of this example. FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a vertical cross-sectional view showing the main configuration of a bobbin mold used in the method for manufacturing a flywheel magneto stator of this example. In addition, the same code | symbol is attached | subjected and shown to the part corresponding to FIGS. 9-12 mentioned above.
[0010]
In the flywheel magneto stator of this example as well, the generator coil 3 is wound around the stator core 1 having a plurality of convex poles 1b radially on the outer periphery of the annular portion 1a via the resin mold bobbin 2, and the resin mold bobbin 2 The terminal pin insertion hole 10 is provided at the location where the resin is present, and the terminal pin 5 is inserted into the terminal pin insertion hole 10 and is supported in an electrically insulated state as in FIGS. 9 to 12 described above. It is.
[0011]
As shown in FIGS. 1 and 2, the flywheel magneto stator of this example is characterized in that a positioning portion insertion recess 11 is commonly provided as a long groove at the end of each terminal pin insertion hole 10. . This positioning portion insertion recess 11 is located at a position where the terminal pin insertion hole forming die 12 can be positioned on the side opposite to the surface receiving the pressure during resin injection from the direction shown by the arrow in FIG. 2 when forming the resin mold bobbin 2. Is provided.
[0012]
Next, a method for manufacturing such a flywheel magneto stator will be described with reference to FIG. 3 in addition to FIGS.
[0013]
In the flywheel magneto stator manufacturing method of this example, when the resin core bobbin 2 is molded by setting the stator core 1 on the bobbin mold 13 shown in FIG. A terminal pin insertion hole forming die 12 is disposed. At this time, the bobbin molding die 13 is previously provided with a positioning portion 14 at a position where the terminal pin insertion hole molding die 12 is positioned on the side opposite to the surface on which the terminal pin insertion hole molding die 12 receives pressure during resin injection. Keep it.
[0014]
In this state, mold resin is injected into the bobbin mold 13 to form the resin mold bobbin 2 on the stator core 1. The terminal pin insertion hole forming die 12 is removed when the bobbin forming die 13 is released. After the terminal pin insertion hole forming die 12 is removed, the terminal pin insertion hole 10 is formed.
[0015]
When the mold resin is injected, the terminal pin insertion hole forming die 12 is positioned by the positioning portion 14 on the side opposite to the surface receiving the pressure at the time of resin injection, so that the terminal pin insertion hole forming die 12 is inclined during the molding. Can be prevented.
[0016]
In the obtained flywheel magneto stator, the portion where the positioning portion 14 exists in a part of the resin mold bobbin 2 remains as the positioning portion insertion recess 11. Further, in this flywheel magneto stator, even if the terminal pin 5 is inserted into the terminal pin insertion hole 10, it does not come into electrical contact with the stator core 1, and the insulation failure of the terminal pin 5 can be prevented.
[0017]
FIGS. 4 and 5 show a second example of the embodiment of the flywheel magneto stator and the manufacturing method thereof according to the present invention, and FIG. 4 shows the configuration of the main part of the flywheel magneto stator of this example. FIG. 5 is a plan view taken along the line BB of FIG. In addition, the same code | symbol is attached | subjected and shown to the part corresponding to FIGS. 1-2 mentioned above.
[0018]
In the flywheel magneto stator and its manufacturing method of this example, in order to position the terminal pin insertion hole forming die 12, the positioning portion 14 provided on the bobbin forming die 13 as shown in FIG. The positioning portion insertion recess 11 formed in the resin mold bobbin 2 by the positioning portion 14 is also characterized by being round. That is, in this example, the positioning part 14 is provided for each location where each terminal pin insertion hole 10 is formed. Other structures and methods are the same as those of the first example described above.
[0019]
Even with such a flywheel magneto stator and its manufacturing method, the same actions and effects as in the first example can be obtained.
[0020]
6 to 8 show a third example of an embodiment of a flywheel magneto stator and a method of manufacturing the same according to the present invention, and FIG. 6 shows a main configuration of the flywheel magneto stator of this example. FIG. 7 is a cross-sectional view taken along the line CC of FIG. 6, and FIG. In addition, the same code | symbol is attached | subjected and shown to the part corresponding to FIGS. 1-2 mentioned above.
[0021]
In the flywheel magneto stator of this example, the stator core 1 has a structure in which pole portions 1d are provided at both ends of a rod-like portion 1c. A resin mold bobbin 2 is formed on the outer periphery of the rod-like portion 1c and the base portion of each pole portion 1d. A terminal pin insertion hole 10 is provided in the resin mold bobbin 2 at the base of the pole part 1d. A positioning portion 14 made of an insulating material such as resin is provided at the end (bottom) of the terminal pin insertion hole 10 at the portion of the resin mold bobbin 2. The positioning portions 14 are configured in a pair so as to be able to grip the end portion of the terminal pin insertion hole forming die 12 described above, and a terminal pin insertion hole forming die insertion space 15 is formed therebetween.
[0022]
In the flywheel magneto stator manufacturing method of this example, when the stator core 1 is set on a bobbin forming die 13 (not shown) and the resin mold bobbin 2 is formed, the terminal pin insertion hole 10 is not shown. The terminal pin insertion hole forming die 12 is disposed, and the end portions of the terminal pin insertion hole forming die 12 are gripped and positioned by a pair of positioning portions 14. These positioning portions 14 are supported by a bobbin mold 13 (not shown). In this state, mold resin is injected into the bobbin mold 13 to mold the resin mold bobbin 2. The terminal pin insertion hole forming die 12 is removed when the bobbin forming die 13 is released. After the terminal pin insertion hole forming die 12 is removed, the terminal pin insertion hole 10 is formed.
[0023]
Even if the resin mold bobbin 2 is molded in this manner, the terminal pin insertion hole molding die 12 can be prevented from being tilted by the positioning portion 14 during molding.
[0024]
In this example, in the obtained flywheel magneto stator, the positioning part 14 remains in a part of the resin mold bobbin 2. Also in this flywheel magneto stator, even if the terminal pin 5 is inserted into the terminal pin insertion hole 10, it does not come into electrical contact with the stator core 1, and insulation failure of the terminal pin 5 can be prevented. .
[0025]
【The invention's effect】
In the flywheel magneto stator manufacturing method according to claim 1, when the resin core bobbin is formed by setting the stator iron core on the bobbin forming die, the terminal pin insertion hole forming die is formed at a location where the terminal pin insertion hole is formed. A positioning portion for positioning the terminal pin insertion hole molding die on the side opposite to the surface on which the terminal pin insertion hole molding die receives pressure during resin injection, and a molding resin is provided on the bobbin molding die. Therefore, the terminal pin insertion hole forming die is pressed against the positioning portion by the pressure at the time of resin injection, so that the terminal pin insertion hole forming die can be prevented from inclining at the time of molding.
[Brief description of the drawings]
FIG. 1 is a plan view showing a configuration of a main part showing a first example of an embodiment of a stator for a flywheel magneto according to the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a longitudinal cross-sectional view showing a main part configuration of a bobbin forming die used in a first example of an embodiment of a manufacturing method of a flywheel magneto stator of the present example.
FIG. 4 is a plan view showing a main part configuration showing a second example of an embodiment of a flywheel magneto stator according to the present invention.
5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is a plan view showing a third example of the embodiment of the stator for flywheel magneto according to the present invention.
7 is a cross-sectional view taken along line CC in FIG.
FIG. 8 is a bottom view of the main part of FIG. 6;
FIG. 9 is a plan view of a conventional stator for a flywheel magneto.
10 is a longitudinal sectional view of FIG. 9;
FIG. 11 is a front view of a terminal pin used in a conventional stator for a flywheel magneto.
FIG. 12 is a plan view of a stator core with a resin mold bobbin used in a conventional flywheel magneto stator.
[Explanation of symbols]
1 Stator core 1a Annular part 1b Convex pole 1c
DESCRIPTION OF SYMBOLS 2 Resin mold bobbin 3 Power generation coil 4 Hole 5 Terminal pin 5a Retaining protrusion 6 Cord holding pin 7 Cord 8 Wire harness 9 Cord clamp 10 Terminal pin insertion hole 11 Positioning part insertion recessed part 12 Terminal pin insertion hole molding die 13 Bobbin shaping die 14 Positioning part 15 Terminal pin insertion hole molding die insertion space

Claims (1)

A power generation coil is wound around the stator iron core via a resin mold bobbin, and a terminal pin insertion hole is provided in the resin mold bobbin where the resin exists, and the terminal pin is inserted into the terminal pin insertion hole for electrical insulation. In the manufacturing method of the flywheel magneto stator supported in the state,
When the stator iron core is set on a bobbin mold and the resin mold bobbin is molded, a terminal pin insertion hole mold is disposed at a location where the terminal pin insertion hole is formed, and the terminal pin insertion hole mold is a resin. A flywheel magneto stator comprising a bobbin mold provided with a positioning portion for positioning the terminal pin insertion hole mold on a side opposite to a surface receiving pressure during injection, and injecting mold resin into the bobbin mold Manufacturing method .

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