JPH08308155A - Rotor for permanent-magnet generator - Google Patents

Abstract

PURPOSE: To improve the power generating ability of a power generating coil, etc., by making the magnetic reluctance of a magnetic circuit connecting a second magnetic pole to an insert core larger so that the magnetic flux from a magnet can be sufficiently concentrated to magnetic poles. CONSTITUTION: A pair of first magnetic poles 41 integrally formed with an insert core 1 and a second magnetic pole 5 which is provided between the magnetic poles 4a and holds a magnet 6 put between the pole 5 and the core 1 are provided in a pole piece section 4.

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 during an internal combustion period, and in particular, an insert core holding a magnet is inserted 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 In a rotor of a conventional magnet generator used in an ignition device during an internal combustion period, for example, a pole piece portion holding a magnet and a balance weight portion are separately formed and these are set in a die mold. After that, aluminum is poured to form an aluminum die cast product.

However, such an aluminum die cast rotor generally requires machining after die casting, resulting in poor machining efficiency of the insert core, high cost, and limited weight reduction.

On the other hand, in contrast, FIG. 11 and FIG.
As shown in FIG. 4, the insert core 41 having the pole piece portion 44 having the magnet 42 on one side and the balance weight portion 45 on the other side with the shaft hole portion 43 interposed therebetween is embedded in the synthetic resin by insert molding to rotate. A child is presented in, for example, Japanese Utility Model Publication No. 5-10526.

In this conventional rotor, the insert core 4
1 is a product in which a plurality of magnetic plates are laminated and fixed by rivets 47 at a plurality of locations, and integrated.
Is a straight hole having the same diameter in the axial direction.

The magnet 42 has a pole piece portion 44.
Of the three magnetic poles 46, 46a, and 46b forming the magnetic pole 46, which are inserted into the opening hole 49 formed in the central magnetic pole 46,
Both ends thereof project to the outside in the axial direction of the magnetic poles 46, 46a, 46b.

In the insert core 41, the pole piece portion 44 and the balance weight portion 45 are integrally formed, and there is no need to assemble them and to perform machining after die casting, so that the cost is relatively low. The advantage was obtained.

[0008]

However, in the rotor of such a conventional magnet generator, since the shaft hole portion 43 is a straight hole, the shaft hole portion 43 is assembled to the crankshaft of the internal combustion engine. In this case, it is difficult to make the mutual binding force sufficient, and there is a problem that it is necessary to use a separately prepared binding aid in order to make the mutual binding force sufficient.

Further, in order to secure a sufficient binding force between the shaft hole portion 43 and the rotor, the shaft hole portion 43 can be used as a taper hole so that they can be tightly fitted together at the time of binding. In the core 41, the tapered holes are formed stepwise for each laminated plate, and the contact with the crankshaft is rattled, resulting in incomplete tight fitting of each other.

Further, since both ends of the magnet 42 are projected to the outside (outside the thickness) of the magnetic poles 46 in the axial direction Z, the magnetic flux of the magnets 42 cannot be sufficiently concentrated on the magnetic poles 46. That is, a part of the magnetic flux leaks out of the magnetic pole 46 and does not reach the power generation coil or the ignition coil, so that there is a problem that the power generation performance for ignition or the like cannot be sufficiently obtained.

Further, in order to fully utilize the performance of the magnet 42 by using the laminated insert core 41, it is necessary to increase the laminated thickness, which increases the weight of the rotor as a whole. In addition, when the laminated thickness is partially changed, there is a problem that the increase of the initial cost, the increase of the processing man-hour and the increase of the cost due to the increase of the press die cannot be avoided.

Further, it is proposed that the insert core is formed of a sintered alloy of a magnetic material, and the magnet is interposed between the insert core and a magnetic pole on a pillar integrally erected on the insert core. However, in this case, it is necessary to make the column considerably thick for the convenience of molding.

Therefore, there has been a problem that the support pole causes a short circuit in the magnetic circuit, the magnetic flux generation rate in the magnetic pole is deteriorated, and the power generation performance in the power generation coil and the like is also insufficient.

The present invention has been made by paying attention to the conventional problems as described above, and by externally attaching a second magnetic pole for sandwiching a magnet between the insert core and the insert core. , By increasing the magnetic resistance of the magnetic circuit connecting the second magnetic pole and the insert core,
An object of the present invention is to obtain a rotor of a magnet generator capable of sufficiently concentrating the magnetic flux of the magnet with respect to the magnetic pole and improving the power generation performance of a power generation coil or the like.

Further, according to the present invention, by interposing a non-magnetic material between the second magnetic pole and the first magnetic pole, the magnetic resistance of the magnetic circuit between them is increased to further increase the magnetic flux of the magnet with respect to the magnetic pole. The aim is to obtain a rotor of a magneto generator that can be fully concentrated.

Further, the object of the present invention is to obtain a rotor for a magnet generator capable of sufficiently concentrating the magnetic flux of the magnet with respect to the magnetic pole with a simple structure of screwing the second magnetic pole and the magnet. And

[0017]

A rotor of a magneto-generator according to a first aspect of the present invention includes a pair of first magnetic poles integrally formed with an insert core in a pole piece portion, and a pair of first magnetic poles. A second magnetic pole, which is a magnetic plate that is mounted between the magnetic poles and holds the magnet between the magnetic core and the insert core, is provided.

According to a second aspect of the present invention, there is provided a rotor for a magneto-generator, wherein a pole piece portion has a pair of first magnetic poles integrally formed with the insert core and a non-magnetic portion between the first magnetic poles. A second magnetic pole, which is a magnetic plate that is mounted via a member and holds a magnet between the magnet and the insert core, is provided.

In the rotor of the magneto-generator according to the invention of claim 3, the second magnetic pole is fixed to the insert core between the first magnetic poles with a non-magnetic material screw via a magnet. Is.

[0020]

In the rotor of the magneto-generator according to the first aspect of the present invention, the second magnetic pole, which is separated from the first magnetic pole provided on the insert core, is mounted between the first magnetic poles. Therefore, the magnetic resistance of the magnetic circuit in these mounting portions can be increased, so that the magnetic flux of the magnet can be sufficiently concentrated in the second magnetic pole, and therefore, the magnetic pole obtained by the second magnetic pole can be obtained. It is possible to effectively apply a magnetic flux of sufficient density to a power generation coil or the like.

Further, in the rotor of the magneto-generator according to the invention of claim 2, the non-magnetic member sufficiently increases the magnetic resistance of the magnetic circuit connecting the second magnetic pole and the first magnetic pole integrated with the insert core. Therefore, it is possible to concentrate the magnetic flux of the magnet further sufficiently on the second magnetic pole, and therefore effectively apply the magnetic flux of sufficient density obtained by the second magnetic pole to the magneto coils and the like. To do.

In the rotor of the magneto-generator according to the third aspect of the invention, the second magnetic pole is directly fixed to the insert core together with the magnet by the non-magnetic material screw, so that the magnetic pole is magnetically insulated from the first magnetic pole. The magnetic flux of the magnet can be sufficiently concentrated on the second magnetic pole in the state, and the magnetic flux concentration effect can be realized with an extremely simple and inexpensive structure.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a rotor of a magneto-generator of the present invention. In FIG. 1, 1 is an insert core made of a sintered alloy of a magnetic material having a substantially I-shape as a whole, and 2 is this insert core 1. It is a non-magnetic material layer such as a synthetic resin layer or an aluminum die-cast layer which is injection-molded so as to cover. Further, the insert core 1 has a pole piece portion 4 having a magnet 6 and a balance weight portion 8 which is opposed to the insert core 1 with the tapered shaft hole portion 3 interposed therebetween.

The pole piece portion 4 is shown in FIGS.
, A pair of substantially L-shaped magnetic poles 4a protruding from one end of the insert core 1, mounting recesses 4b recessed between the magnetic poles 4a, and a pair of opposing wall surfaces in the mounting recess 4b. And a magnet receiving portion 4d protruding from the bottom of the mounting recess 4b.

Numeral 5 is approximately Ω due to the magnetic material as a whole.
As shown in FIG. 4, the magnetic poles are formed in a V shape, and both ends of the magnetic poles are engageable with the engaging projections 5c.
Are lined up.

Further, 6 is a magnet, which is the locking projection 4
When the engaging piece 5a is engaged with c, it is sandwiched between the U-shaped portion of the magnetic pole 5 and the receiving surface of the magnet receiving portion 4d.

That is, the magnetic poles 5 are formed independently of the insert core 1, and when the rotor is assembled,
It is mounted on the insert core 1, and the magnetic resistance of the magnetic circuit is increased at the mounting portion (separation portion).

The magnetic pole 5 and the magnet 6 also constitute a part of the pole piece portion 4, and the magnetic pole 5 functions so as to generate a voltage in the vicinity of a power generation coil or an ignition coil (not shown).

The insert core 1 having the pole piece portion 4 and the drawing balance weight portion 8 as shown in FIGS. 2 and 3 is arranged in a mold (not shown), and each portion except the shaft hole portion 3 is made of synthetic resin. By injection molding or aluminum die casting to form a disk-shaped rotor covered with the non-magnetic material layer 2 as shown in FIG.

Further, 7 is a cooling fin which is formed at the same time when the synthetic resin is injection-molded or when aluminum die-casting is formed, and is projected in a shape suitable for cooling the internal combustion engine.

Further, the magnet 6 has the same Z length in the axial direction with respect to the magnetic poles 4a and 5, so that the magnetic flux of the magnet 6 is concentrated on the magnetic pole 5 to achieve high efficiency with respect to an ignition coil and a generator coil (not shown). I am able to influence.

The balance weight portion 8 has a necessary and sufficient weight commensurate with the weight of the pole piece portion 4, is designed to improve the moment of inertia with respect to the insert core 1, and has a substantially arc shape as a whole. Make up.

The insert core 1 having the shaft hole portion 3, the pole piece portion 4 and the balance weight portion 5 is integrally formed of a magnetic material made of a sintered alloy by using one die as described above. It Therefore, the shape and size of the insert core 1 can be arbitrarily selected, and the weight and the manufacturing cost can be reduced as compared with the conventional laminated insert core.

Further, the shaft hole portion 3 is a tapered hole whose inner diameter changes in the axial direction as described above, and since this tapered hole is formed by the mold at the same time when the insert core 1 is molded, It is possible to smoothly finish the inner peripheral surface.

Therefore, when the rotor having such a tapered hole as the shaft hole portion 3 is press-fitted and mounted on the crankshaft of the internal combustion engine, a part of the tapered hole is tightly fitted so as to be caught in the outer periphery of the crankshaft. To be done. Therefore, the rotor can be surely bound to the set position of the crankshaft.

Further, the outer peripheral surfaces of the magnetic poles 4a and 5 are slightly exposed to the outside of the non-magnetic material layer 2, so that the magnetic flux of the magnet 6 can be efficiently supplied to the power generating coil and the ignition coil. The power generation efficiency in each coil can be improved.

In the rotor of the magneto-generator having such a structure, the rotor is attached to the crankshaft of the internal combustion engine as described above to rotate, and the magnetic pole 5 is connected to the power-generating coil or the ignition coil arranged near the rotor. To sufficiently generate a pulsed induced electromotive force in each of these coils.

In this case, the magnetic pole 5 is integrally mounted on the magnet 6, and is mounted in the magnet receiving portion 4d of the insert core 1 by the engaging piece 5a.

Therefore, the magnetic resistance of the magnetic circuit at the engaging portion between the engaging piece 5a and the engaging projection 4c for engaging the engaging piece 5a is increased, that is, the short circuit portion of the magnetic circuit can be reduced and the magnet 6 is generated. Magnetic flux that does not pass through this engaging part,
Most of the magnetic flux can be concentrated on the magnetic pole 5, and the magnetic flux passing through the magnetic pole 5 can be sufficiently applied to the coil. Thus, the power generation performance of each coil can be significantly improved.

In order to further reduce the short circuit portion of the magnetic circuit, for example, as shown in FIG. 5, the rising piece 5b covering the side surface of the magnet 6 of the magnetic pole 5 may be suppressed to a small width. it can.

FIG. 6 shows a rotor according to another embodiment of the present invention. The insert core 11 constituting this rotor is formed by laminating a plurality of magnetic plates with rivets 19 fixed.

Also in this embodiment, the insert core 11 is formed into a disk shape by being covered with the non-magnetic layer 12 except for the shaft hole portion 13, and one side facing the shaft hole portion 13 sandwiches the magnet 16. It has a pole piece portion 14 and the other has a balance weight 18.

As shown in FIGS. 7 and 8, the pole piece portion 14 has a pair of substantially L-shaped magnetic poles 14a protruding from one end of the insert core 11 and the magnetic poles 14a.
It has a mounting recess 14b recessed between them, a locking projection 14c projecting on a pair of opposing wall surfaces in the mounting recess 14b, and a magnet receiving portion 14d projecting on the bottom of the mounting recess 14b. .

Reference numeral 15 is a magnetic pole formed in a substantially Ω shape by a magnetic plate, and at both ends of the magnetic pole, as shown in FIG. 7, an engaging piece 15a engageable with the engaging projection 14c. Are lined up.

Reference numeral 16 denotes a magnet, which is sandwiched and held between the U-shaped portion of the magnetic pole 15 and the receiving surface of the magnet receiving portion 4d when the engaging piece 15a is engaged with the locking projection 14c. It has become so.

The magnetic pole 15 and the magnet 16 also constitute a part of the pole piece portion 14, and the magnetic pole 15 forms a magnetic circuit for generating a voltage in the vicinity of a generator coil or an ignition coil (not shown). ing.

In this embodiment, the magnetic pole 15 and the magnet 16 have the same Z length in the axial direction, and the insert core 1
Since the thickness is greater than 1, the magnetic flux having a high density generated in the magnet 16 has a small magnetic resistance (the mutual bonding areas are equal).
Through the magnetic pole 15, it is possible to sufficiently reach the power generation coil and the like.

FIG. 9 shows another embodiment of the present invention. In the figure, 21 is an insert core made of a sintered alloy of magnetic materials or laminated magnetic plates. In this insert core 21, 22 is a shaft hole portion such as a tapered hole or a straight hole,
3a is a pair of L-shaped magnetic poles provided at one end of the insert core 22, and 23b is a mounting recess formed between these magnetic poles 23a.

Further, 23c is a notch formed in the facing wall surface of the mounting recess 23b, and 24 is the opposite so that the engaging pieces 24a at both ends bite into the non-magnetic member 23d mounted in the notch 23c. An Ω-shaped magnetic pole supported by the wall 23b, which is a magnetic plate.

Reference numeral 25 is a magnet, which is the magnetic pole 24.
And the bottom of the mounting recess 23b.
The magnetic poles 23a and 24 and the magnet 25 form a pole piece portion.

The insert core 21 having such a structure is provided with a non-magnetic layer formed by injection molding of synthetic resin or aluminum die casting on the insert core 21 in the same manner as in the above-mentioned respective embodiments.
It is a disc-shaped rotor.

In this embodiment, the magnetic pole 24 and the magnetic pole 2 are
By providing the non-magnetic member 23d as described above with 3a, the magnetic resistance in these locking portions (coupling portions) becomes extremely high.

Therefore, the leakage of the magnetic flux from the magnetic pole 24 to the magnetic pole 23a is reduced, that is, the short circuit portion of the magnetic circuit is reduced, and most of the magnetic flux of the magnet 25 passes through the magnetic pole 24 and is sufficiently concentrated on the generator coil or the like. Therefore, the power generation efficiency of these power generation coils can be made extremely high.

FIG. 10 shows still another embodiment of the present invention. In this embodiment, a magnet 34 and a magnetic pole 35 of substantially the same size are sequentially placed on the bottom of a mounting recess 33b formed between a pair of L-shaped magnetic poles 33a, and a non-magnetic material screw such as stainless steel is inserted through them. The magnet 34 and the magnetic pole 35 are fixed to the insert core 31 by screwing 36 onto the bottom.

In this embodiment, since the magnetic pole 35 is mounted on the insert 31 via the non-magnetic material screw 36, a magnetic short circuit between the magnetic pole 35 and the insert core 31 can be almost completely avoided. As a result, the magnetic flux from the magnetic pole 35 can be sufficiently concentrated in the power generation coil or the like, and desired desired power generation performance can be obtained.

[0056]

As described above, according to the first aspect of the present invention, the pole piece portion is mounted on the pair of first magnetic poles integrally formed with the insert core and between the first magnetic poles. And the second magnetic pole made of a magnetic plate for sandwiching the magnet with the insert core is provided, the second magnetic pole for sandwiching the magnet with the insert core is By externally attaching the second magnetic pole and the insert core, the magnetic resistance of the magnetic circuit connecting the second magnetic pole and the insert core can be increased, the magnetic flux of the magnet can be sufficiently concentrated on the magnetic pole, and power generation in the power generation coil or the like can be performed. There is an effect that the thing which can improve performance is obtained.

According to the second aspect of the invention, the pair of first magnetic poles formed integrally with the insert core in the pole piece portion and the non-magnetic member interposed between the first magnetic poles. Since the second magnetic pole, which is mounted and holds the magnet between the insert core and the second magnetic pole, is provided, the magnetic resistance of the magnetic circuit connecting the second magnetic pole and the first magnetic pole is reduced. There is an effect that the magnetic flux can be increased and the magnetic flux of the magnet can be more sufficiently concentrated on the magnetic pole.

Further, according to the invention of claim 3, the second magnetic pole is screwed to the insert core between the first magnetic poles by a non-magnetic material screw via a magnet. There is an effect that a magnetic flux of the magnet can be sufficiently concentrated on the magnetic pole with a simple configuration in which the magnetic pole of 2 and the magnet are screwed.

[Brief description of drawings]

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

FIG. 2 is a front view showing an insert core in FIG.

FIG. 3 is a vertical sectional view of the insert core shown in FIG.

FIG. 4 is an exploded perspective view showing enlarged magnetic poles and magnets in FIG.

5 is an exploded perspective view showing another embodiment of the magnetic poles and magnets in FIG. 2 in an enlarged manner.

FIG. 6 is a front view showing a rotor of a magneto generator according to another embodiment of the present invention.

FIG. 7 is a front view showing the insert core in FIG.

8 is a vertical cross-sectional view of the insert core shown in FIG.

FIG. 9 is a partially cutaway front view showing an insert core of a rotor of a magneto generator according to another embodiment of the present invention.

FIG. 10 is a sectional view showing a partially broken insert core of a rotor of a magneto generator according to another embodiment of the present invention.

FIG. 11 is a perspective view showing an insert core in a rotor of a conventional magneto generator.

12 is a vertical cross-sectional view of the insert core shown in FIG.

[Explanation of symbols]

1, 11, 21, 31 Insert core 2,12 Non-magnetic material layer 3,13,22 Shaft hole part 4,14 Pole piece part 4a, 5, 14a, 15, 23a, 24, 33a, 35
Magnetic pole 6,16,25,34 Magnet 8,18 Balance weight part 23d Non-magnetic member 36 Non-magnetic material screw

Claims (3)

[Claims] 1. An insert core having a pole piece portion holding a magnet, one of which faces the shaft hole portion and a balance weight portion, and the other is formed into a disc shape so as to cover the insert core. In a rotor of a magneto-generator having a nonmagnetic material layer, the pole piece portion has a pair of first magnetic poles formed integrally with the insert core,
A rotor of a magneto-generator, comprising: a second magnetic pole, which is mounted between these first magnetic poles and which comprises a magnetic plate that sandwiches the magnet between the first magnetic pole and the insert core. 2. An insert core, one of which is opposed to the other with the shaft hole interposed therebetween, 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 magneto-generator having a nonmagnetic material layer, the pole piece portion has a pair of first magnetic poles formed integrally with the insert core,
A second magnetic pole, which is mounted between these first magnetic poles via a non-magnetic member and has a magnetic plate that sandwiches the magnet between the first magnetic pole and the insert core, Rotor. 3. The magnet according to claim 1, wherein the second magnetic pole is screw-fixed on the insert core between the first magnetic poles by a non-magnetic material screw via a magnet. Generator rotor.