JPH0793806B2 - Signal generator for internal combustion engine ignition system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a signal generator for an ignition device of an internal combustion engine, wherein a phase difference is set between a positive waveform and a negative waveform of a positive / negative signal voltage waveform. It takes a signal generator to obtain the advance width.

[Prior Art] Conventionally, a signal generator that generates a signal for determining an ignition advance angle of an ignition device that ignites an internal combustion engine has an outer peripheral side or an inner peripheral side of a peripheral wall of an iron bowl-shaped rotor connected to the internal combustion engine. An inductor magnetic pole portion is formed on the circumferential side and is punched out at a required angle.
Further, an electron emitting magnetic pole portion of the core is provided so as to face the inductor magnetic pole portion. Magnetic flux flows through the core while the inductor magnetic pole portion and the electron emitting magnetic pole portion are opposed to each other. At this time, the signal generator generates a positive signal voltage waveform, then a negative signal voltage waveform, and advances by setting the phase difference between the positive and negative waveforms of the positive and negative signal voltage waveforms. You're getting a square width.

[Problems to be Solved by the Invention] However, in the signal generator with the above configuration, it is necessary to change the launch angle of the inductor magnetic pole portion of the peripheral wall of the rotor every time the advance width of the internal combustion engine is changed. Since different types of rotors are required, there is a problem that the manufacturing cost increases. Further, in the signal generator having the above-described configuration, when the advance angle width is increased and the launch angle is increased, the distortion of the rotor is increased, the inductor magnetic pole portion of the rotor is in contact with the electron generating magnetic pole portion, and the rotor core is There was a problem that there was a gap.

INDUSTRIAL APPLICABILITY The present invention makes it possible to easily change the advance angle width, and even in an internal combustion engine having a large advance angle width, it is possible to prevent the distortion of the rotor from increasing, the contact between the inductor magnetic pole portion and the electron generating magnetic pole portion, and the misalignment of the rotor to be prevented. An object is to provide a signal generator for an engine ignition device.

[Means for Solving the Problems] In order to achieve the above object, the signal generator for an internal combustion engine ignition device of the present invention is formed on a peripheral wall of an iron bowl-shaped rotor connected to a rotating shaft of an internal combustion engine. A core having an inductor magnetic pole portion and an electron emission magnetic pole portion provided so as to face the inductor magnetic pole portion;
A magnet that causes a magnetic flux to flow through the core; and a signal generator that is attached to the core and that has a generator coil that generates a positive / negative signal voltage waveform while the inductor magnetic pole portion and the emission magnetic pole portion face each other. In the signal generator for an internal combustion engine ignition device, the positive and negative signal voltage waveforms are formed by forming the width of the generator magnetic pole portion wider than the width of the coil winding portion of the core in the displacement direction of the inductor magnetic pole portion. A configuration in which a phase difference is set between the positive waveform and the negative waveform of is adopted.

[Operation and Effect of the Invention] With the above configuration, the signal generator for the internal combustion engine ignition device of the present invention has the following operation and effect.

When the rotary motion is transmitted to the iron bowl-shaped rotor connected to the internal combustion engine, the width of the inductor magnetic pole portion formed on the peripheral wall of the rotor and the width of the coil winding portion of the core becomes wider in the displacement direction of the inductor magnetic pole portion. The formed electron-emitting magnetic pole portion periodically opposes. While these are facing each other, a magnetic flux flows in the core, and at this time, a positive waveform of a positive and negative signal voltage waveform is generated in the magneto coil, and then a negative waveform is generated at an ignition advance interval, By setting the phase difference between the positive and negative waveforms of the positive and negative signal voltage waveforms in this way, the advance width can be obtained. Therefore, when changing the advance angle width, it is possible to deal with internal combustion engines of various advance angle widths simply by changing the cores.

Further, in recent years, the advance width tends to increase in order to obtain the optimum value of the ignition timing of the internal combustion engine. However, even if the advance width increases, it is not necessary to increase the launch angle of the rotor. Distortion becomes large, and it is possible to prevent contact between the inductor magnetic pole portion and the electron-emitting magnetic pole portion and misalignment of the rotor.

[Embodiment] An embodiment of a signal generator for an internal combustion engine ignition device of the present invention will be described with reference to the drawings.

1 and 2 show a signal generator for an internal combustion engine ignition device of a two-wheeled vehicle, which uses an embodiment of the signal generator for an internal combustion engine ignition device according to the present invention.

Reference numeral 1 denotes a magnet generator for an ignition device of an internal combustion engine of a two-wheeled vehicle.

The magneto-generator 1 is an iron bowl-shaped rotor 11 formed by pressing an iron plate, a stator (installed in the rotor 11), and a generator coil (not shown) wound around a core (not shown) ( (Not shown).

The rotor 11 is provided with a boss portion 13 at the center of the bottom wall portion 12, and the rotor 11 is connected to the internal combustion engine by fastening and fixing the boss portion 13 to, for example, a crankshaft of the internal combustion engine. Also the rotor
A plurality of permanent magnets 16 are attached to the inner peripheral side 15 of the peripheral wall 14 of 11.

Reference numeral 2 shows a signal generator for an ignition device of an internal combustion engine of a two-wheeled vehicle according to the present invention.

The signal generator 2 includes an inductor 3 and a signal generator 4. The inductor 3 is provided with a convex inductor magnetic pole portion 31 in which the peripheral wall 14 of the rotor 11 is stamped on the outer peripheral side 17 by pressing.

The signal generating electron 4 is composed of a core 5, a permanent magnet 6 for flowing a magnetic flux φ through the core 5, and a power-generating coil 7 attached to the core 5.

The core 5 has a substantially T-shaped and substantially rectangular electron-generating magnetic pole portion 5
1. A coil-wound portion 53 in the shape of a round rod extending from the central portion 52 of the magnetic pole portion 51 to the direction away from the peripheral wall of the rotor 11. The electron-generating magnetic pole portion 51 is provided so as to face the inductor magnetic pole portion 31, has a slight axial width (thickness), and has a width (diameter) of the coil winding portion 53 that is smaller than that of the inductor magnetic pole portion 31. It is formed wide in the displacement direction (the rotating direction of the inductor magnetic pole portion 31). In this electron-generating magnetic pole portion 51, the width in the displacement direction of the inductor magnetic pole portion 31 between the magnetic pole front end 54 and the magnetic pole rear end 55 corresponds to the advance angle width θ, and the angle with the axial center of the rotor 11 as the center. It has an arc shape with a flow of α. That is, the inductor magnetic pole portion 31 and the electron-emitting magnetic pole portion
Everything from 51 is equidistant.

The permanent magnet 6 is made of ferrite and is provided in a housing 8 made of a thermoplastic resin such as polyamide resin so that the N pole is arranged on the core 5 side. The permanent magnet 6 is sandwiched by magnetic pole pieces 82 and 83 that focus the magnetic flux of the permanent magnet 6. The magnetic pole piece 83 is L-shaped, one end 84 is fixed inside the housing 8, and the other end 85 is projected to the outside of the housing 8 and extends toward the peripheral wall 14 of the rotor 11.

In this embodiment, the magnetic pole piece 83, the permanent magnet 6, the magnetic pole piece 82, and the generator coil 7 wound around the pre-winding frame 86 are mounted in this order in the housing 8 and filled with a thermosetting resin such as epoxy resin. After that, the core 5 is driven into the power generation coil 7 and the fitting claw 56
Is fitted into the fitting portion 81 of the housing 8 made of resin and having a rectangular cross section. The housing 8 is attached to a fixed member (not shown) such as a case of an internal combustion engine via an attachment member.

As a result, the permanent magnet 6 → the magnetic pole piece 82 → the coil winding portion 53 of the core 5 → the electron generating magnetic pole portion 51 of the core 5 → the inductor magnetic pole portion 31 of the rotor 11 → the peripheral wall 14 of the rotor 11 → the magnetic pole piece 83 → the permanent magnet The magnetic flux φ flows along the path of 6.

The operation of the signal generator of this embodiment will be described with reference to FIGS.

In the signal generator 2 of this embodiment, the rotation of the crankshaft is transmitted to the rotor 11, and the inductor magnetic pole portion 31 formed on the peripheral wall 14 of the rotor 11 and the width of the coil winding portion 53 of the core 5 make the inductor The electron-generating magnetic pole portion 51 formed wide in the displacement direction of the magnetic pole portion 31,
While facing periodically, the permanent magnet 6 → the magnetic pole piece 82 → the coil winding portion 53 of the core 5 → the electron generating magnetic pole portion 51 of the core 5 → the inductor magnetic pole portion 31 of the rotor 11 → the peripheral wall 14 of the rotor 11 → the magnetic pole piece As shown in FIG. 3, a magnetic flux φ flows through the path of 83 → permanent magnet 6. At this time, when the inductor magnetic pole portion 31 faces the magnetic pole front end 54 of the electron generating magnetic pole portion 51, a positive waveform V ₁ of the positive / negative signal voltage waveform is generated in the magneto coil 7 as shown in FIG. After that, when the inductor magnetic pole portion 31 faces the magnetic pole rear end 55 of the electron generating magnetic pole portion 51, as shown in FIG. 3, a negative waveform V ₂ is generated at an ignition advance interval, and this positive / negative signal is generated. By setting the phase difference between the positive waveform V ₁ and the negative waveform V ₂ of the voltage waveform, the advance width θ can be obtained.

Therefore, for example, a positive waveform V ₁ is generated at the low speed side ignition position (minimum advance position) of the internal combustion engine, and a negative waveform V ₂ is generated at the high speed side ignition position (maximum advance position) of the internal combustion engine. Therefore, it is possible to control the ignition device that obtains the advance angle characteristic by using the two signals of the signal voltage that determines the ignition position on the low speed side and the signal voltage that determines the ignition position on the high speed side.

Further, the pole piece 83, the permanent magnet 6 and the pole piece 8 are provided in the housing 8.
2. The generator coil 7 wound around the preliminarily wound frame 86 is mounted in this order, filled with a thermosetting resin such as epoxy resin, and then the core 5 is driven into the generator coil 7 and the fitting claw 56 is made of resin. Since the core 5 can be mounted by fitting it into the fitting portion 81 of the housing 8 having a rectangular cross section, the width of the electronic magnetic pole portion 51 varies depending on the advance width θ of the internal combustion engine. Can be replaced.

Therefore, since the performance of the internal combustion engine is improved in recent years, in order to obtain the optimum value of the ignition timing of the internal combustion engine, for example, the advance angle θ
However, in the signal generator 2 of this embodiment, it is necessary to change the launch angle of the inductor magnetic pole portion 31 of the peripheral wall 14 of the rotor 11 every time the advance angle width θ of the internal combustion engine is changed. 1 which has the inductor magnetic pole portion 31 of the minimum necessary launch angle
The rotor 11 may have various shapes, and the manufacturing cost can be reduced. Therefore, the rotor 11 does not distort, and the contact between the inductor magnetic pole portion 31 of the rotor 11 and the electron-generating magnetic pole portion 51 and the misalignment of the rotor 11 can be prevented.

(A) In this embodiment, the peripheral wall 14 of the rotor 11 is stamped to the outer peripheral side 17 to provide the convex inductor magnetic pole portion 31.
The recessed inductor magnetic pole portion 31 may be provided by punching 14 toward the inner peripheral side 15. Further, the width of the inductor magnetic pole portion 31 is not limited to this embodiment, and may be wider or narrower than the width of the coil winding portion 53 of the core 5 in the displacement direction of the inductor magnetic pole portion.

(B) In the present embodiment, the electron-generating magnetic pole portion 51 is provided at a symmetrical position in which the magnetic pole front end 54 and the magnetic pole rear end 55 are extended to the same length as the coil winding portion 53. Not limited. Further, although the magnetic emission magnetic pole portion 51 of the core 5 is formed in a substantially rectangular shape, various elliptical shapes can be changed.

C) In this embodiment, the electron-generating magnetic pole portion 51 and the coil winding portion 53 are integrally provided, but they may be provided separately.

[Brief description of drawings]

FIG. 1 is a front sectional view of an embodiment of a signal generator for an internal combustion engine ignition device according to the present invention, and FIG. 2 is a side sectional view of an embodiment of a signal generator for an internal combustion engine ignition device according to the present invention. FIG. 3 is a graph showing the relationship between magnetic flux and signal voltage waveform and time of an embodiment of the signal generator for an internal combustion engine ignition device of the present invention. In the figure, 1 ... Magnet generator, 2 ... Signal generator, 3 ... Inductor, 4 ... Signal generator, 5 ... Core, 6 ... Permanent magnet, 7 ... Generator coil, 11 ... Rotor , 14 …… Surrounding wall, 17
...... Outer peripheral side, 31 …… Inductor magnetic pole part, 51 …… Electron generating magnetic pole part

Claims (1)

[Claims] 1. A core having an inductor magnetic pole portion formed on a peripheral wall of an iron bowl-shaped rotor connected to a rotary shaft of an internal combustion engine, and a core having an electron generating magnetic pole portion provided so as to face the inductor magnetic pole portion. A magnet that causes a magnetic flux to flow through the core; and a signal generator that is attached to the core and that has a generator coil that generates a positive / negative signal voltage waveform while the inductor magnetic pole portion and the emission magnetic pole portion face each other. In the signal generator for an internal combustion engine ignition device, the positive and negative signal voltage waveforms are formed by forming the width of the generator magnetic pole portion wider than the width of the coil winding portion of the core in the displacement direction of the inductor magnetic pole portion. A signal generator for an internal combustion engine ignition device, wherein a phase difference is set between a positive waveform and a negative waveform of the.