JPH0753394Y2 - Ignition magnet generator rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a rotor of an ignition magnet generator used to drive an ignition device for an internal combustion engine.

[Prior Art] In an ignition magnet generator installed in an internal combustion engine or the like for a two-wheeled vehicle, a signal used as a rotor magnetic pole of a signal generator on an outer peripheral portion of a cup-shaped flywheel that constitutes a yoke of the rotor. By forming a magnetic pole portion for a vehicle and making a signal generating electron arranged on the outer peripheral side of the flywheel face the magnetic pole portion for a signal, a signal generator for obtaining a control signal for the ignition device for an internal combustion engine is configured. .

In addition, when a ring gear that forms a part of the engine starter is attached to the outer periphery of the flywheel as in the rotor of an ignition magnet generator installed in an internal combustion engine used for outboard motors, the flywheel is used. The signal magnetic pole portion is provided on the outer periphery of the boss portion, and the signal generator disposed inside the flywheel is opposed to the signal magnetic pole portion to form a signal generator.

Furthermore, in a rotor that uses a flywheel as a yoke, two tool insertion holes are provided in the bottom wall of the flywheel, and when the flywheel is attached to the rotary shaft of the engine,
Also, when detaching from the rotary shaft, a detachable tool is inserted into these tool insertion holes to prevent the flywheel from rotating.

[Problems to be Solved by the Invention] Recently, in order to increase the output of the internal combustion engine and save fuel consumption, the ignition timing of the engine is strictly controlled, and the ignition timing is advanced accordingly. Increasing the width of the corner is often required.

Further, in a recent ignition device for an internal combustion engine, two signals generated respectively when both ends of a rotor magnetic pole of a signal generator face a magnetic pole of a signal generator and when the facing is removed,
The lead angle width is often set according to the interval between these signals, but in this case, the lead angle width is determined by the polar arc angle of the signal magnetic pole portion, so when a wide lead angle width is required,
It is unavoidable that the signal magnetic pole portion becomes considerably large. Therefore, the imbalance of the weight of the rotor due to the provision of the signal magnetic pole portion becomes a non-negligible size, and when the rotor is rotated at a high speed, a swing occurs in the rotation.

In the past, in order to correct this imbalance in weight, a hole for balancing was made at a predetermined location on the bottom wall of the flywheel to perform balancing, but in this case, the flywheel was adjusted to balance. Since it is necessary to make many holes, there is a problem that the work is troublesome, the number of steps is large, and the cost of the rotor is high.

An object of the present invention is to provide a rotor of an ignition magnet generator capable of balancing weight without complicating the structure of the flywheel and without increasing the number of processing steps. It is in.

[Means for Solving the Problems] In the present invention, a tool insertion hole provided in a flywheel for inserting a tool for attaching / detaching a flywheel is used to correct an imbalance in weight generated on the flywheel by a signal magnetic pole portion. The flywheel weight is balanced by the tool insertion hole.

When two tool insertion holes are provided, the two tool insertion holes are symmetrical with respect to the first reference line passing through the axial center portion of the flywheel and the central portion of the signal magnetic pole portion, In addition, it is provided on the bottom surface of the flywheel in a state in which the position is displaced with respect to a second reference line that is orthogonal to the first reference line and that passes through the axial center portion. Further, the amount of displacement and the direction of displacement of the positions of the two tool insertion holes with respect to the second reference line are set to be appropriate for balancing the overall weight.

The signal magnetic pole portion may be provided on the outer periphery of the peripheral wall portion of the flywheel, or may be provided on the outer periphery of the boss portion of the flywheel.

[Operation] As described above, when the tool insertion hole is provided at a position suitable for correcting the imbalance of the weight of the flywheel and the weight of the flywheel is balanced by the tool insertion hole, the structure of the flywheel is improved. It is possible to balance the entire weight without complicating the rotor, and to obtain a rotor that does not shake even when rotated at high speed.
Further, even if the rotor is balanced, the number of holes provided for that purpose can be reduced, so that the number of steps can be reduced.

Embodiments Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 show a first embodiment of the present invention, in which 1 is a flywheel 101 and a magnet 1
A rotor 2 composed of 02 and a stator 2 in which an armature coil 202 is wound around an armature core 201, and these constitute a magnet generator for ignition.

The flywheel 101 includes a flywheel main body 103 formed in a cup shape and a hole provided at the center of a bottom wall portion 103a of the main body 103, and a flange portion 104a is fastened to the flywheel main body by a rivet 105. A plurality of bosses 104, and a plurality of magnets 102 of equal size are fixed to the inner circumference of the peripheral wall portion 103b of the flywheel body 103 at equal angular intervals.

A rotary shaft fitting hole 106 having a taper is formed in the boss 105, and a rotary shaft of an engine (not shown) is formed in the rotary shaft fitting hole.
The taper portion provided at the tip end of is fitted. Generally, a screw is provided at the tip of the rotary shaft of the engine, and the boss 10
A nut is screwed into the screw portion projecting outward from 4 and the nut is tightened so that the tapered portion of the rotary shaft is tightened with respect to the tapered surface of the rotary shaft fitting hole 106.

The armature iron core 201 shown in the drawing has an annular yoke portion 201a, which is fitted into a spigot portion 301 of a fixed mounting portion 3 provided in a case of the engine, and the iron core 2 is fixed by a bolt 4
01 is fixed to the mounting portion 3.

On the outer periphery of the peripheral wall portion 103b of the flywheel 101, for example, by punching a part of the peripheral wall portion to the outside in the radial direction, a signal magnetic pole portion 107 formed of an arcuate protrusion is formed, and on the outer peripheral side of the flywheel. The signal generator 5 is arranged to face the signal magnetic pole portion 107. The signal emitting device is fixed to a mounting portion provided on the engine cover or the like.

As the signal emitting electron 5, for example, a known one in which an iron core having a magnetic pole portion facing the signal magnetic pole portion 107, a signal coil wound around the iron core, and a magnet for flowing a magnetic flux to the iron core are used in one body You can In this case, when the magnetic pole portion of the iron core of the signal generating electron faces one end in the circumferential direction of the signal magnetic pole portion 107 and when the magnetic pole portion of the iron core separates from the other end of the signal magnetic pole portion 107, the magnetic flux changes in the iron core. Occurs and a pulsed signal is induced in the signal coil.

As mentioned above, the magnetic pole part for signal is provided on the outer circumference of the flywheel.
When 107 is provided, the weight balance of the flywheel is lost, and therefore, when this rotor is rotated at high speed, the rotation will shake. Therefore, in the present invention, two tool insertion holes 10 are provided on the bottom wall side of the flywheel for connecting the flywheel attaching / detaching tool to the flywheel.
8, 108 is the axial center of the flywheel 101 and the signal magnetic pole 10
Positioned symmetrically with respect to the first reference line L1 passing through the center of 7 and with respect to the second reference line L2 orthogonal to the first reference line L1 and passing through the axial center on the bottom surface of the flywheel. Is provided in a displaced state. The amount of displacement and the direction of displacement of the positions of the two tool insertion holes 108, 108 with respect to the second reference line L2 are set appropriately in order to balance the weight of the entire rotor, and the tool insertion holes 108, 108 allow the flywheel 101 to move. The weight is balanced. In the present embodiment, since the signal magnetic pole portion 107 is provided so as to project outward from the outer circumference of the flywheel, the tool insertion holes 108 and 108 have the reference line L.
It is provided by displacing the position closer to the signal magnetic pole portion 107 than the position 2, and the displacement amount d of the both tool insertion holes from the reference line L2 is appropriately set according to the size of the signal magnetic pole portion 107.

The signal magnetic pole portion 107 may be any one as long as it gives a magnetic flux change to the signal emitting electrons 5, and therefore the signal magnetic pole portion 107 can also be formed by a recess provided on the outer periphery of the flywheel. In this case, the tool insertion holes 108, 108 are provided by displacing to the opposite side to the above-mentioned embodiment.

When inserting the rotor into the engine, the tool insertion holes 108, 108
A detachable tool is inserted in the nut, and the nut screwed to the threaded portion at the tip of the rotary shaft of the engine is tightened while the flywheel is stopped by the tool.

In this way, if the tool insertion holes 108, 108 originally provided in the flywheel are provided so as to be displaced from the center of the flywheel, and the weight of the flywheel is balanced by the tool insertion holes, the number of machining steps is particularly increased. You can balance the weight of the rotor without
The manufacturing cost of the rotor can be reduced.

If the rotor weight imbalance cannot be completely corrected with the tool insertion holes 108, 108, a hole for balancing can be provided on the bottom wall of the flywheel, etc. Even if holes are provided, the number can be significantly reduced as compared with the conventional case, and the number of steps can be reduced.

In the above-described embodiment, the tool insertion holes 108, 108 are formed in the boss 104.
It can also be provided on the flange portion 104a.

FIGS. 3 and 4 show other embodiments of the present invention. In these drawings, the same reference numerals are respectively attached to the same parts as those of the embodiments shown in FIGS. 1 and 2. Is attached. Also in this embodiment, the flywheel 101 is composed of a cup-shaped flywheel body 103 and a boss 104.
Reference numeral 4 denotes a flange portion 104a fitted into a hole provided in a bottom wall portion of the flywheel, and is joined to the flywheel main body by an appropriate means such as welding or pressure welding.

A ring gear 6 forming a part of a starting device for an internal combustion engine is attached to the outer periphery of the flywheel 101 by shrink fitting, and a magnet 102 is attached to the inner periphery of the flywheel.

The stator 2 is composed of an armature core 201 and an armature coil 202 wound around the armature core, and is fixed by bolts 4 to a mounting portion 3 provided on the case of the engine.

In this embodiment, a signal magnetic pole portion 107 is provided on the outer periphery of the boss 104 so as to project the signal generator 5 which is arranged inside the stator 2 and fixed to a mounting portion 7 provided in the case of the engine. It faces the magnetic pole portion 107.

Further, in this embodiment, the tool insertion holes 108, 108 form the flange portion of the boss 104 (which forms a part of the bottom wall portion of the flywheel) 104a.
These tool insertion holes are located at positions symmetrical with respect to the first reference line L1 so as to correct the weight imbalance caused by providing the signal magnetic pole portion 107. And the position is displaced with respect to the second reference line L2.

Further, in this embodiment, the screw hole 10 is formed in the flange portion 104a of the boss.
9,109, ... are provided. These screw holes are used to attach other components such as pulleys to the flywheel.

Although two tool insertion holes are provided in the above embodiment, the number of tool insertion holes is arbitrary.

[Advantages of the Invention] As described above, according to the present invention, the tool insertion hole provided in the flywheel for inserting the tool for attaching and detaching the flywheel is used to correct the imbalance in the weight of the flywheel caused by the signal magnetic pole. Since the weight of the flywheel is balanced by using these tool insertion holes, it is possible to balance the weight of the rotor without complicating the structure of the flywheel. It is possible to obtain a rotor that does not shake even when rotated at high speed. In addition, even if balancing is performed,
Therefore, since the number of holes provided can be reduced, the number of steps can be reduced and the manufacturing cost of the rotor can be reduced.

[Brief description of drawings]

1 and 2 are a longitudinal sectional view and a front view showing a first embodiment of the present invention, and FIGS. 3 and 4 are a longitudinal sectional view and a front view showing a second embodiment of the present invention, respectively. It is a figure. 1 ... Rotor of ignition magnet generator, 101 ... Flywheel, 102 ... Magnet, 103 ... Flywheel body, 104
...... Boss, 107 …… Signal pole for signal, 108 …… Tool insertion hole,
2 ... Stator, 5 ... Signal emitting electron.

Claims (4)

[Scope of utility model registration request] 1. A signal generator for an internal combustion engine ignition device, comprising a flywheel formed into a cup shape and a permanent magnet attached to an inner circumference of a peripheral wall portion of the flywheel, and an outer periphery of the peripheral wall portion of the flywheel. The magnetic pole portion for signal constituting the rotor magnetic pole is formed, and a tool insertion hole for inserting a tool for attaching and detaching the flywheel is provided on the bottom wall side of the flywheel. In the child, the tool insertion hole is provided at a position suitable for correcting an imbalance in weight generated in the flywheel by the signal magnetic pole portion, and the weight of the flywheel is balanced by the tool insertion hole. The rotor of the ignition magnet generator, which is characterized in that 2. The two tool insertion holes are provided, and the two tool insertion holes are with respect to a first reference line passing through an axial center portion of the flywheel and a central portion of the signal magnetic pole portion. Symmetrically and on the bottom surface of the flywheel, the first
And a displacement amount with respect to the second reference line at positions of the two tool insertion holes, The rotor of an ignition magnet generator according to claim 1, wherein the direction of displacement is set appropriately to balance the entire weight. 3. A signal generator for an internal combustion engine ignition device, comprising a flywheel formed into a cup shape and a permanent magnet attached to the inner circumference of the flywheel, and the outer circumference of a boss portion provided on the flywheel. The magnetic pole portion for signal constituting the rotor magnetic pole is formed, and a tool insertion hole for inserting a tool for attaching and detaching the flywheel is provided on the bottom wall side of the flywheel. In the child, the tool insertion hole is provided at a position suitable for correcting an imbalance in weight generated in the flywheel by the signal magnetic pole portion, and the weight of the flywheel is balanced by the tool insertion hole. The rotor of the ignition magnet generator, which is characterized in that 4. The two tool insertion holes are provided, and the two tool insertion holes are with respect to a first reference line passing through an axial center portion of the flywheel and a central portion of the signal magnetic pole portion. Symmetrically and on the bottom surface of the flywheel, the first
And a displacement amount with respect to the second reference line at positions of the two tool insertion holes, the position being displaced with respect to a second reference line that is orthogonal to the reference line passing through the axial center portion. The rotor of an ignition magnet generator according to claim 3, wherein the direction of displacement is set appropriately to balance the entire weight.