JP2000032722A - Internal combustion engine flywheel magnet generator and assembly method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust easily a gap length between a magnet rotor and a stator so as to be a specified value. SOLUTION: A flywheel magnet rotor 2 is composed of a flywheel 201 and a permanent magnet 202 which is attached to the outer circumference side of the circumferential wall 201a of the flywheel 201 to form a rotary magnetic field. A gap adjusting tape 8 is stuck to the outer circumference of the circumferential wall of the flywheel. After the magnet rotor 2 is attached to the crank shaft 1a of an engine, the magnet rotor 2 is turned manually to position the gap adjusting tape 8 at a position where the pole 301a of a stator 3 is provided. The stator 3 is attached to the engine 1 while the pole 3a of the stator 3 is brought into contact with the tape 8. Then, the tape 8 is separated from the pole 301a of the stator by turning the magnet rotor and removed from the outer circumference of the flywheel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel magnet generator mounted on an internal combustion engine and a method for assembling the same.

[0002]

2. Description of the Related Art A flywheel magnet generator mounted on an internal combustion engine to drive an ignition device for the internal combustion engine or the like is, as shown in FIG. 3, a flywheel magnet rotor 2 mounted on a crankshaft 1a of the engine 1. And a stator 3 fixed to the engine 1.

[0003] The flywheel magnet rotor 2 comprises a flywheel 201, a permanent magnet 202 and a pole piece 203 attached to the flywheel 201. The flywheel 201 includes a peripheral wall 201a and a bottom wall 201 provided to close one end of the peripheral wall in the axial direction.
The flywheel has a substantially cup-like shape, and a boss 201c for attaching a rotating shaft is formed at the center of the bottom wall 201b of the flywheel. A blower blade 201d for generating wind for cooling the engine is formed on the outer surface of the bottom wall 201b of the flywheel.

A magnet mounting recess 201e is formed on the outer periphery of the peripheral wall 201a of the flywheel 201, and an overhang 201g whose outer surface is flush with the inner bottom surface of the magnet mounting recess 201e extends from the peripheral wall 201a along the axis. It is formed so as to protrude in the direction. Magnet mounting recess 20
1e and the outer surface of the overhang portion 201g constitute a magnet mounting surface, and the permanent magnet 2 is provided on the magnet mounting surface.
02 is arranged.

[0005] A pole piece 203 is disposed on the outer end face of the permanent magnet 202 facing outward in the radial direction of the flywheel 201. The permanent magnet 202 and the pole piece 203 are provided with an adhesive,
It is fixed to the flywheel 201 by a screw 204 screwed into the bottom of the magnet mounting recess through the pole piece 203 and the magnet 202. The permanent magnet 202 is magnetized in the radial direction of the flywheel, and the magnetic poles appearing on the pole pieces 203 and the magnetic poles appearing on the outer periphery of the flywheel on both sides of the magnet mounting recess 201e constitute a three-pole rotating field. I have.

In FIG. 3, reference numeral 210 denotes a permanent magnet 2
This is a protective case provided to cover the side surface of the magnet to protect 02.

A boss portion 201c of the flywheel is formed with a tapered hole.
a, the flywheel magnet rotor 2 is attached to the engine. In the illustrated example, the nut 4 is screwed into a screw formed at the tip of the crankshaft 1a protruding from the boss 201c, and the flywheel magnet rotor 2 is fastened to the crankshaft.

The stator 3 which constitutes the magnet generator together with the flywheel magnet rotor 2 has a pair of magnetic poles (referred to as stator-side magnetic poles) 301a, 301a provided at intervals in the circumferential direction of the magnet rotor. (One magnetic pole 301a is shown in the figure.
Only appears. ) At the end of the armature core 301 and a power generating coil wound around the armature core, and the stator-side magnetic poles 301a provided on the armature core 301 are provided with rotating field magnets. And the outer peripheral surface of the peripheral wall portion 201a of the flywheel via a prescribed gap g.

In assembling the magnet generator, first, the flywheel magnet rotor 2 is attached to the crankshaft 1a of the engine, and the stator 3 is temporarily fixed to the engine. 3 stator-side magnetic poles 301a, 301
After adjusting the gap g between a and the magnetic pole surface of the rotating field to a specified value, the stator 3 is formally fixed. Thereafter, the gap gauge 6 is removed from between the magnet rotor and the stator, and the assembly of the magnet generator is completed.

In some magnet generators, as shown in FIG. 4, an outer flange 2 protruding radially outward from the magnetic pole surface of the rotating field is formed at an end of the flywheel 201 on the bottom wall side.
By forming the airfoil 01f and providing the blower wings 201d over the outer flange, the position of the blower wings may be shifted to the outer diameter side of the flywheel to increase the airflow.

Further, when the engine is started by an electric motor, as shown in FIG. 4, a ring for meshing a pinion gear driven by the motor for starting the engine with the outer periphery of the open end of the flywheel 201. The gear 205 is often attached.

As shown in FIG. 4, when the outer flange 201f is formed on the flywheel, the magnetic pole surface of the rotating field and the stator side are fixed with the flywheel magnet rotor attached to the crankshaft. The clearance gauge cannot be inserted between the magnetic pole. Therefore, when such a flywheel magnet rotor is used, before attaching the flywheel magnet rotor, as shown in FIG. 5, the outer diameter of the magnetic pole surface of the rotating field of the flywheel magnet rotor is reduced. Also, a rotating body gauge 7 having a large outer diameter by a specified gap is attached to the crankshaft 1a of the engine.
After the stator 3 is attached so that the stator-side magnetic pole 301a is brought into contact with the rotor, a specified gap g is formed between the magnet rotor and the stator, and then the rotating body gauge 7 is removed. The flywheel magnet rotor 2 is attached to the crankshaft 1a.

[0013]

In the conventional magnet generator shown in FIG. 3, the gap between the magnetic pole surface of the rotating field of the flywheel magnet rotor and the outer peripheral surface of the flywheel and the stator-side magnetic pole is set. In order to adjust g, it is necessary to insert a gap gauge and to remove the gap gauge, which makes the gap adjustment work troublesome and requires the management of the gap gauge. There was a problem that the manufacturing cost of the machine was high.

As shown in FIG. 4, when an outer flange 201f is formed at the end of the flywheel 201, the rotating body gauge 7 is required. And increased costs were inevitable. When the ring gear 205 is attached as shown in FIG.
After removing the rotating body gauge 7, it is necessary to attach the flywheel magnet rotor to the crankshaft 1a while tilting the ring gear 205 so as not to touch the stator 3 as shown by a chain line in FIG. For this reason, there has been a problem that it takes time to mount the magnet rotor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flywheel for an internal combustion engine which can easily adjust the gap between the magnet rotor and the stator regardless of the structure of the hulawheel magnet rotor. An object of the present invention is to provide a wheel magnet generator and a method of assembling the magnet generator.

[0016]

SUMMARY OF THE INVENTION The present invention relates to a flywheel magnet generator for an internal combustion engine comprising a flywheel magnet rotor and a stator.

A flywheel magnet rotor used in the magnet generator to which the present invention is applied is provided so as to close a peripheral wall portion and one end side of the peripheral wall portion in the axial direction, and has a boss portion for attaching a rotating shaft at a central portion. A flywheel having a bottom wall portion formed with a flywheel, and a permanent magnet attached to an outer peripheral side of a peripheral wall portion of the flywheel and magnetized in a radial direction of the flywheel. It is fitted to the tip of the crankshaft of the internal combustion engine. In this magnet rotor, a rotating field is formed on the outer peripheral side of the peripheral wall of the flywheel by the permanent magnet.

[0018] The stator constituting the magnet generator together with the magnet rotor has an armature core fixed to the internal combustion engine and a power generating coil wound around the armature core. The stator-side magnetic pole provided on the child core is opposed to the magnetic pole surface of the rotating field via a predetermined gap.

In assembling the magnet generator, the flywheel magnet rotor is attached to the internal combustion engine, and the gap adjusting tape is positioned at a position where the stator-side magnetic poles are arranged. The stator is attached to the internal combustion engine in a state in which the stator is in contact with the gap adjusting tape.

Thereafter, the flywheel magnet rotator is rotated to a position where the work for detaching the gap adjusting tape from the flywheel magnet rotator is possible, and the gap adjusting tape is removed from the flywheel magnet rotator.

[Position where the work for detaching the gap adjusting tape from the flywheel magnet rotor is possible]
For example, a position where the gap adjusting tape does not contact the stator side magnetic pole, or a position where most of the gap adjusting tape does not contact the stator side magnetic pole, and the tape is separated from the magnet rotor. This is the position where the magnet rotor can be removed by peeling.

As described above, according to the present invention, the stator is mounted on the engine with the stator-side magnetic poles in contact with the gap adjustment tape attached to the flywheel magnet rotor attached to the crankshaft. After installation, the specified gap can be formed between the rotor and stator simply by removing the gap adjusting tape, making it extremely easy to adjust the gap regardless of the structure of the magnet rotor. As a result, assembly of the magnet generator can be facilitated.

The material of the gap adjusting tape is arbitrary, but if the tape is formed of paper, the tape is broken and removed by forcibly rotating the rotor after the stator is attached. Therefore, the operation of removing the gap adjusting tape can be omitted.

In this specification, the term “tape” refers to
It refers to a thin sheet-shaped material made of a flexible material such as paper, resin, or metal foil. The tape usually has a belt-like shape in general, but the gap adjusting tape used in the present invention may be any tape as long as it can be interposed between the stator and the rotor to define the gap. It does not necessarily have to be a belt. For example, in order to reduce the adhesive area of the tape and facilitate its peeling, the contour of the gap adjusting tape may be a comb shape or the like.

[0025]

FIG. 1 shows a flywheel magnet rotor 2 used in the present invention. In this example, the basic configuration of the magnet rotor 2 is the same as that of the conventional example shown in FIG. 3, and a sectional view in a state where the magnet rotor 2 is attached to the engine is the same as FIG. In FIG. 1, the same parts as those of the flywheel magnet rotor shown in FIG. 3 are denoted by the same reference numerals as those in FIG.

In FIG. 1, reference numeral 201 denotes a flywheel configured to have a substantially cup shape by a peripheral wall portion 201a and a bottom wall portion 201b provided so as to close one axial end of the peripheral wall portion. A boss 201c for attaching a rotating shaft is provided at the center of the bottom wall of the flywheel.
Are formed.

On the outer surface of the bottom wall portion 201b of the flywheel, there are blower blades 201 for generating wind for cooling the engine.
d is formed.

On the outer peripheral portion of the peripheral wall portion 201a of the flywheel 201, a permanent magnet 2 having the same structure as that shown in FIG.
The pole piece 203 is attached to the pole piece 203, and the magnetic poles appearing on the pole piece 203 and the magnetic poles appearing on the outer periphery of the flywheel on both sides of the magnet mounting recess 201e constitute a three-pole rotating field.

A tapered hole is formed in the boss portion 201c of the flywheel, and the boss portion 201c is fitted to the crankshaft 1a of the engine by a structure similar to that of the magnet generator shown in FIG. The rotor 2 is attached to the engine.

A stator 3 which constitutes a magnet generator together with the flywheel magnet rotor 2 has an armature core 3 similar to that used in the conventional magnet generator shown in FIG.
01 and a generator coil wound around the armature core, and the stator-side magnetic pole 3 provided on the armature core 301.
01a is opposed to the magnetic pole surface of the rotating field and the outer peripheral surface of the peripheral wall 201a of the flywheel via a prescribed gap g.

In the present invention, a gap adjusting tape having a thickness corresponding to the specified value of the gap is removed from the magnetic pole surface of the rotating field or the portion of the outer peripheral surface of the flywheel facing the stator side magnetic pole. Pasted when possible. In the example shown in FIG.
Magnet mounting concave portion 201e on the outer peripheral surface of the peripheral wall portion 201a.
A gap adjusting tape 8 made of an adhesive tape having a thickness equal to the specified value of the gap is affixed to a position where the gap is avoided and at a position facing the stator-side magnetic pole portion. As the adhesive to be adhered to the gap adjusting tape 8, it is preferable to use an adhesive which is relatively easy to peel off, for example, an adhesive used for temporary fixing.

When assembling the magnet generator, the flywheel magnet rotor 2 is mounted on the internal combustion engine, and the gap adjusting tape 8 is positioned at a position where the stator-side magnetic poles are arranged. The stator 3 is mounted on a mounting portion provided on a case of the internal combustion engine with the side magnetic poles lightly abutting on the gap adjusting tape 8. Thereafter, the flywheel magnet rotator is manually rotated to a position where the gap adjusting tape can be detached from the flywheel magnet rotator 2, and the gap adjusting tape 8 is peeled off from the flywheel magnet rotator 2. .

Although not shown in FIGS. 2 and 3, actually, the flywheel magnet rotor 2 and the stator 3 are attached to the engine, and then the magnet rotor 2 and the stator 3 are covered. And a cooling air passage for guiding the cooling air generated by the blower blades 201d to the engine side is formed in the cover.

As described above, according to the present invention, the stator 3 is brought into contact with the gap adjusting tape attached to the flywheel magnet rotor 2 attached to the crankshaft while the stator-side magnetic pole is in contact with the gap adjusting tape. After mounting on the engine, a specified gap can be formed between the rotor and the stator simply by removing the gap adjusting tape 8, so that the gap can be adjusted regardless of the structure of the magnet rotor. It can be done very easily. In addition, since a gap gauge is not used, gauge management is not required.

FIG. 2 shows an outer flange 2 near the bottom wall of the flywheel, similarly to the magnet generator shown in FIG.
01f is formed and the present invention is applied to a case where the ring gear 205 is attached to the outer periphery of the peripheral wall on the opening side of the flywheel. In this example,
Flywheel outer flange 201f and ring gear 20
5, a gap adjusting tape 8 having a thickness corresponding to a specified value of the gap g is attached to the outer peripheral surface of the peripheral wall portion 201a located between the tapes.

Also in this case, the magnet rotor 2 is connected to the crankshaft 1
a, the gap adjusting tape 8 is positioned at a position where the stator-side magnetic pole 301a is arranged, and the stator 3 is mounted in a state where the stator-side magnetic pole 301a is in contact with the gap adjusting tape 8. By simply rotating the flywheel magnet rotator 2 manually so that the gap adjusting tape 8 is located at a position deviated from the stator-side magnetic pole 301a, the gap adjusting tape 8 is simply detached from the flywheel 201, A prescribed gap can be formed between the magnet rotor 2 and the stator 3.

In the above example, the gap adjusting tape is stuck on the portion of the outer peripheral surface of the flywheel opposite to the stator-side magnetic pole. A gap adjusting tape may be attached.

[0038]

As described above, according to the present invention, the stator is brought into contact with the gap adjusting tape attached to the flywheel magnet rotor attached to the crankshaft while the stator side magnetic poles are in contact with the gap adjusting tape. After mounting on the engine, the specified gap can be formed between the rotor and stator simply by removing the gap adjusting tape, so that the gap can be adjusted extremely regardless of the structure of the magnet rotor. There is an advantage that it can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a flywheel magnet rotor used in a flywheel magnet generator according to the present invention.

FIG. 2 is a sectional view showing an example in which a flywheel magnet generator according to the present invention is configured using a magnet rotor different from the magnet rotor shown in FIG.

FIG. 3 is a cross-sectional view illustrating a configuration of a conventional flywheel magnet generator.

FIG. 4 is a cross-sectional view showing the configuration of another conventional flywheel magnet generator.

5 is a cross-sectional view showing a state in which a rotating body gauge is attached to a crankshaft to form a prescribed gap between a flywheel magnet rotor and a stator in the magnet generator of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 1a ... Crankshaft, 2 ... Flywheel magnet rotor, 201 ... Flywheel, 201a ... Peripheral wall part, 201b ... Bottom wall part, 201c ... Boss part, 201d ...
Blower blade, 201e: recess for mounting magnet, 202: permanent magnet, 203: pole piece, 204: screw, 3: stator, 30
DESCRIPTION OF SYMBOLS 1 ... Armature iron core, 302 ... Generating coil, 8 ... Gap adjusting tape

Claims (2)

[Claims] A flywheel having a peripheral wall portion and a bottom wall portion provided so as to close one axial end of the peripheral wall portion and having a boss portion for attaching a rotating shaft at a central portion; A permanent magnet attached to the outer peripheral side of the peripheral wall portion of the wheel and magnetized in the radial direction of the flywheel, wherein the permanent magnet forms a rotation field on the outer peripheral side of the peripheral wall portion of the flywheel, A flywheel magnet rotor having a boss portion of the flywheel fitted to a tip of a crankshaft of an internal combustion engine; an armature core fixed to the internal combustion engine; and a power generating coil wound around the armature core. And a stator having a stator-side magnetic pole provided on the armature core opposed to a magnetic pole surface of the rotating field via a prescribed gap. smell A state in which a gap adjusting tape having a thickness corresponding to a specified value of the gap can be removed from a magnetic pole surface of the rotating field or a portion of the outer peripheral surface of the flywheel facing the stator-side magnetic pole. A flywheel magnet generator for an internal combustion engine, wherein the generator is affixed with: 2. A flywheel having a peripheral wall portion and a bottom wall portion provided so as to close one axial end of the peripheral wall portion and having a boss portion for attaching a rotating shaft at a central portion, and the flywheel. A permanent magnet attached to an outer peripheral side of a peripheral wall portion of the wheel and magnetized in a radial direction of the flywheel, and a rotating field is formed on an outer peripheral side of the peripheral wall portion of the flywheel by the permanent magnet. A flywheel magnet rotor, having an armature core fixed to the internal combustion engine and a power generating coil wound around the armature core, wherein the stator-side magnetic pole provided on the armature core is A method of assembling a flywheel magnet generator for an internal combustion engine including a stator which is opposed to a magnetic pole surface of a rotating field of a flywheel magnet rotor via a prescribed gap, wherein the magnetic pole surface of the rotating field or A gap adjusting tape having a thickness corresponding to a specified value of the gap is detachably attached to a portion of the outer peripheral surface of the flywheel facing the stator-side magnetic pole, and the flywheel magnet is After the rotor is attached to the internal combustion engine, and the gap adjusting tape is positioned at a position where the stator-side magnetic poles are arranged, the stator-side magnetic poles are brought into contact with the gap adjusting tape. Attach the stator to the internal combustion engine, and then rotate the flywheel magnet rotor to a position where the work for separating the gap adjusting tape from the flywheel magnet rotor becomes possible, thereby removing the gap adjusting tape. A method for assembling a flywheel magnet generator for an internal combustion engine, wherein the flywheel magnet generator is removed from the flywheel magnet rotor.