JPH0923599A - Rotor of magnet power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably fix a magnet and a second magnetic pole to an insert core at a low cost without any mechanical process to the insert core. SOLUTION: A pole piece section 2 is constituted comprising a pair of first magnetic poles 5a, 5b integrally provided at the positions sandwiching a magnet 6 of an insert core 1 and a second magnetic pole 7 fixed, together with the magnet 6, on the insert core 1 between the first magnetic poles 5a, 5b with a screw 9 and a nut 10 made of a non-magnetic material. The screw 9 and nut 10 are inserted into the recessed holes 11, 12 opening in the side surface of the insert core from the side surface and these are engaged with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a magnet generator used in an ignition device of an internal combustion engine, and more particularly, to insert a magnet holding insert core into a non-magnetic material such as synthetic resin by insert molding. The present invention relates to those formed by embedding.

[0002]

2. Description of the Related Art Conventionally, a rotor of a magneto-generator used for an ignition device of an internal combustion engine has, for example, a pole piece portion holding a magnet and a balance weight portion separately formed, and these are set in a die-gust type. Aluminum is poured in this state to form an aluminum die-gust product.

However, the rotor of such an aluminum die-gust product generally requires machining after die casting, so that the machining efficiency of the insert core is poor, the cost is high, and the weight reduction is limited. there were.

On the other hand, as shown in FIGS. 13 and 14, on the other hand, one of the magnets 22 facing each other with the shaft hole 21 in between is opposed to the magnet 22.
For example, Japanese Utility Model Publication No. 5-10526 discloses a rotor in which an insert core 18 having a pole piece portion 19 having a groove and a balance weight portion 20 is embedded in a synthetic resin by insert molding.

In this conventional rotor, the insert core 1
Reference numeral 8 is a product obtained by laminating a plurality of magnetic plates and fixing them with rivets 26 at a plurality of locations.

The magnet 22 has a pole piece portion 19
Of the three magnetic poles 23, 24 forming the
It is inserted into the opening hole 25 formed in, and both ends thereof project to the outside in the axial direction of the magnetic poles 23 and 24.

In the insert core 18, the pole piece portion 19 and the balance weight portion 20 are integrally molded, and there is no need for assembling them and machining after die casting, so that the cost is relatively low. The advantage is that

However, in the rotor of such a conventional magneto-generator, since both ends of the magnet 22 are projected outside (outside the thickness) of the magnetic pole 24 in the axial direction Z, the magnet 22 is formed. Of the magnetic flux of the magnetic poles 23, 24 cannot be sufficiently concentrated, that is, a part of the magnetic flux of the magnetic pole 2
3,24 out of reach of the power generation coil and ignition coil,
There has been a problem that the power generation performance for ignition etc. cannot be sufficiently induced.

On the other hand, in order to solve such a problem, FIG.
A rotor as shown in Fig. 5 has been proposed. This is because the length of the magnet 6 in the axial direction is made substantially equal to the thickness of the pole piece portion 2 and the second magnetic pole is formed between the pair of first magnetic poles 5a and 5b of the insert core 27 made of a sintered alloy. The magnet 6 is screwed together with the non-magnetic material screw 9 together with 7.

Reference numeral 3 denotes a balance weight portion, which is provided on the opposite side of the pole piece portion 2 with the shaft hole 4 interposed therebetween.
Reference numeral 8 is a pilot hole and a female screw into which the screw 9 is inserted and screwed.

[0011]

However, since the rotor of such a conventional magneto-generator is configured as described above, the magnet 6 and the second central magnetic pole 7 are connected to the pole piece of the insert core 27. To fix to part 2,
The first magnetic pole 5 of the pole piece portion 2 of the insert core 27
A pilot hole and a female screw 28 are machined in a substantially central portion between a and 5b, and the magnet 6 and the second central screw are formed by a screw 9 made of a non-magnetic material.
Since the magnetic pole 7 must be fixed, and the prepared hole and the female screw 28 must be machined in the insert core 27, the machining process cannot be reduced and the cost cannot be reduced. .

The present invention has been made in view of the above problems, and the magnet and the second magnetic pole can be fixed to the insert core reliably and inexpensively without any machining of the insert core. The purpose is to obtain the rotor of a magnet generator.

Another object of the present invention is to obtain a rotor of a magnet generator capable of reliably preventing the magnet from being displaced on its mounting surface when assembled to an insert core.

Another object of the present invention is to obtain a rotor for a magnet generator capable of easily carrying out a tightening operation of a magnet and a second magnetic pole on an insert core with a screw and a nut.

[0015]

A rotor of a magneto-generator according to the invention of claim 1 constitutes a pole piece portion and is integrally provided at a position sandwiching a magnet of an insert core. A concave hole portion having a magnetic pole and a second magnetic pole fixed to the insert core between the first magnetic pole by a screw and a nut made of a non-magnetic material together with the magnet, and formed in a side surface of the insert core. On the other hand, the screw and the nut are inserted from the side surface side to be fitted.

According to a second aspect of the present invention, there is provided a rotor for a magneto-generator, wherein a magnet mounting surface of an insert core has:
Ribs for preventing displacement are provided so as to restrict displacement of the magnet in the direction along the mounting surface.

In the rotor of the magneto-generator according to the third aspect of the present invention, the concave hole portion into which the nut is fitted is formed in a size that restricts rotation of the nut.

[0018]

According to the rotor of the magneto-generator of the first aspect of the present invention, a screw and a nut for fixing the magnet and the second magnetic pole are respectively fitted in the concave holes provided in the insert core and opened on the side surface thereof. And by tightening the screw from the outside of the second magnetic pole, the magnet and the second magnetic pole can be easily and inexpensively attached to the insert core without providing the insert core with a prepared hole or a female screw as in the conventional case. Make it fixable.

In the rotor of the magnet generator of the second aspect of the present invention, the displacement preventing ribs are projected on the magnet mounting surface of the insert core so as to cover at least three lower ends of the magnet. , Prevents the magnet from being displaced axially and circumferentially of the rotor and allows the magnet to be correctly locked in position between the two first poles.

In the rotor of the magneto-generator according to the third aspect of the invention, the concave hole portion into which the nut is fitted is shaped and dimensioned so as to prevent the nut from turning, and the screw is attached from the outside of the second magnetic pole to the nut. By screwing these nuts into the nut, the work of screwing these nuts into the nut can be facilitated and ensured.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 6, reference numeral 1 denotes an insert core, one of which is opposed to the shaft hole 4 with the pole piece 2 holding the magnet 6 and the other of which is a balance weight 3.

Reference numerals 5a and 5b are a pair of first magnetic poles formed integrally with the insert core 1, and 7 is a non-magnetic material via the magnet 6 between the pair of first magnetic poles 5a and 5b. This is a second magnetic pole of a magnetic material fixed by a screw (bolt) 9 and a nut 10 and manufactured by, for example, press working.

Further, 8 is a rib for preventing displacement, which is provided on the mounting surface of the magnet 6 so as to sandwich the magnet 6 from the left and right, 11 is a concave hole portion into which the screw 9 is fitted, and 12 is the nut. The recessed hole portions 10 are wider than the recessed hole portions 11 into which they are fitted, and these also open on one side surface of the insert core 1.

Reference numeral 13 is a non-magnetic material layer, for example, a synthetic resin layer, which is formed by subjecting the assembly of the insert core 1 to injection molding in a disc shape.

Next, the procedure for assembling the insert core 1 will be described. First, a diagram for mounting the pair of first magnetic poles 5a, 5b, the screw 9 and the nut 10 on the insert core 1 using a magnetic material such as iron oxide powder as shown in the figure. Concave hole 1 as shown in FIG.
1, 12, a pole piece portion 2 having a magnet position deviation preventing rib 8 provided between the pair of first magnetic poles 5a, 5b, a tapered shaft hole portion 4, and the shaft hole portion 4, respectively. The balance weight 3 provided so as to be sandwiched is integrally molded.

Further, through holes 6a and 7a are provided at substantially central portions of the magnet 6 and the second magnetic pole 7, and the screw 9 is inserted into the through holes 6a and 7a, and the screw 9 is properly positioned. The nut 10 is attached to the.

Then, the assembly of the magnet 6 and the second magnetic pole 7 to which the screw 9 and the nut 10 described above are attached is provided between the pair of first magnetic poles 5a and 5b in the pole piece portion 2 of the insert core 1. A fixing jig or the like is provided so that the magnet 6 is interposed between the position deviation preventing ribs 8 provided on the above, the screw 9 is inserted into the concave hole portion 11, and the nut 10 is inserted into the concave hole portion 12, respectively. It is used and attached to the insert core 1 from the side thereof.

Next, the magnet and the second magnetic pole 7 mounted by the fixing jig or the like are fixed. In the case of the present invention, the screw 9 is fixed to the nut whose rotation is restricted by the concave hole 12. These can be tightened and fixed simply by turning in the tightening direction.

That is, as shown in FIGS. 2 and 3, the concave hole portion 12 provided in the insert core 1 and into which the nut 10 is fitted has a size slightly larger than the opposite side of the nut 10. Since it is a hole, the opposite side portion of the nut 10 comes into contact with the wall of the recessed hole portion 12, and even when the screw 9 is tightened, the nut 10 itself does not rotate.

On the other hand, a concave hole portion 11 into which the screw 9 is fitted.
As shown in FIG. 4, since the screw 9 has a clearance for smoothly rotating, it does not hinder the fastening and fixing of the magnet 6 and the like.

The nut 10 has the concave hole portion 12
A magnetic material may be used as long as the position is away from the magnetic path of the magnet 6, and the shaft hole portion 4 is a tapered hole for facilitating the die cutting at the time of molding. Alternatively, a straight hole may be used.

Next, the assembly of the insert core 1 including the magnet 6, the magnetic pole 7 and the like described above is applied to the first magnetic pole of the insert core 1 with respect to a mold for injection molding of a non-magnetic material such as synthetic resin. 5a, 5b and the outermost diameter portion of the second magnetic pole 7 are set to be exposed, and the outer shape is formed into a disk shape by injection molding of synthetic resin as shown in FIG. This completes the rotor.

It should be noted that it is optional to provide a cooling fan for cooling the engine integrally with the disk-shaped rotor if necessary.

Generally, the magnet 6 is a magnet which is magnetized in advance, but a magnet which is not magnetized may be used in some cases. In this case, the magnet is magnetized after the injection molding described above. You can also go and use it as a magnet.

Further, in the above-mentioned embodiment, the case where the injection molding is performed by the synthetic resin which is the non-magnetic material is shown, but the invention is not limited to this, and the injection molding such as the conventional aluminum die casting is performed. The same effect as that of the above-described embodiment can be obtained.

7 to 12 show another embodiment of the present invention. In this embodiment, on the mounting surface of the magnet 6 between the first magnetic poles 5a and 5b of the insert core 1 as shown in FIG.
As shown in FIGS. 7 and 8, the lower portion of the magnet 6 is protruded with a displacement prevention rib 15 for preventing displacement in the thrust direction (in this embodiment, one thrust direction) and the direction intersecting with the thrust direction. It is set up.

Further, in this embodiment, as shown in FIGS. 9 and 11, the magnet 6 is provided on one side surface of the rib for preventing displacement and the insert core 1 facing the thrust direction.
A recessed hole portion 16a is provided for allowing the screw 9 to which is attached to be inserted.

On the other hand, on the other side surface of the insert core 1, as shown in FIGS. 10 and 12, a concave hole portion 17 for allowing the nut 10 to be inserted from the other side surface and a concave shape for accommodating the lower end of the screw 9 are formed. Each hole 16b is provided.

In this embodiment, first, the insert core 1
The nut 10 is inserted into the concave hole portion 17 from the other side surface side, and then the screw 9 passed through the magnet 6 and the second magnetic pole 7 is inserted from the one side surface side of the insert core 1 at this time. Align the end of the screw 9 with the nut 10 and screw in.

After that, the screw 9 is screwed into the nut 10 by using a jig while the second magnetic pole 7 is positioned in the displacement prevention rib 15, and the magnet 6 is
Can be firmly fixed to the insert core 1 without displacement. That is, in this embodiment, the displacement prevention rib 15 provided at the installation site of the magnet 6 on the insert core 1 is displaced in any of front, rear, left and right directions when the magnet 6 is assembled with the screw 9 and the nut 10. Can be reliably and easily prevented without using a holding jig, so that the magnet 6 and the second magnetic pole 7 can be stably held at a predetermined position even after the assembling.

[0041]

As described above, according to the first aspect of the present invention, the pair of first magnetic poles, which constitute the pole piece portion and are integrally provided at the positions sandwiching the magnet of the insert core,
A second magnetic pole fixed on the insert core between the first magnetic poles by a screw and a nut of a non-magnetic material together with the magnet, and with respect to the concave hole formed in the side surface of the insert core, Since the screw and the nut are inserted and fitted from the side surface side, the magnet and the second magnetic pole can be securely and inexpensively fixed to the insert core without machining the insert core. There is an effect that can be obtained.

Further, the rotor of the magneto-generator according to the invention of claim 2 is, on the insert surface of the magnet in the insert core, for preventing displacement of the magnet for restricting displacement of the magnet in a direction along the attachment surface. Since the rib for use is formed to project, there is an effect that it is possible to reliably prevent the magnet from being displaced on the mounting surface when assembled to the insert core.

Further, since the rotor of the magneto-generator according to the invention of claim 3 is configured such that the concave hole portion into which the nut is fitted is formed in a size that restricts rotation of the nut,
There is an effect that it is possible to easily obtain the operation of tightening the magnet and the second magnetic pole to the insert core with the screw and the nut.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a rotor of a magnet generator according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing a rotor of the magneto generator in FIG. 1 with a part thereof cut away.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a perspective view showing a rotor of the magnet generator in FIG. 1 with a part thereof cut away.

FIG. 6 is a side sectional view showing the rotor of the magneto generator after injection molding in the present invention with a part thereof broken away.

FIG. 7 is a front view of essential parts showing a rotor of a magneto generator according to another embodiment of the present invention.

8 is a plan view of the rotor of the magneto generator in FIG. 7. FIG.

9 is a side cross-sectional view of the rotor of the magneto generator in FIG. 7.

10 is a rear view of the rotor of the magneto generator in FIG. 7. FIG.

11 is a cross-sectional view taken along the line CC of FIG.

FIG. 12 is a sectional view taken along line DD of FIG. 10;

FIG. 13 is a perspective view showing a rotor of a conventional magnet generator.

14 is a cross-sectional view of the rotor of the magneto generator in FIG.

FIG. 15 is a front cross-sectional view showing a rotor of another conventional magnet generator.

[Explanation of symbols]

 1 Insert Core 2 Pole Piece Part 3 Balance Weight Part 4 Shaft Holes 5a, 5b First Magnetic Pole 6 Magnet 7 Second Magnetic Pole 8,15 Misalignment Prevention Rib 9 Screw (Bolt) 10 Nuts 11, 12, 16a, 16b , 17 Recessed hole 13 Non-magnetic material layer

Claims (3)

[Claims] 1. An insert core, one of which faces a shaft hole and which is a pole piece part for holding a magnet, and the other of which is a balance weight part, and a disk-shaped member which covers the insert core. In a rotor of a magnet generator having a non-magnetic material layer, the pole piece portion is configured,
Further, the pair of first magnetic poles are integrally provided at a position sandwiching the magnet of the insert core, and the magnet and the magnet are fixed on the insert core between the first magnetic poles by a screw and a nut of a non-magnetic material. A rotor for a magneto-generator, comprising: a second magnetic pole; and a recessed hole formed in a side surface of the insert core and into which the screw and nut inserted from the side surface are fitted. 2. A magnet generator, wherein a rib for preventing displacement is provided on a mounting surface of the magnet in the insert core so as to restrict displacement of the magnet in a direction along the mounting surface. Rotor. 3. The concave hole portion for fitting the nut,
A rotor for a magneto-generator, which is formed in a size that restricts rotation of the nut.