JPH072001B2 - Magnet generator for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used in a non-contact ignition device for an internal combustion engine, and more particularly to a multi-pole internal sensor type magnet generator that can be used also in a two-cycle engine. It is a thing.

[Conventional technology]

In the conventionally known multi-pole generator for non-contact ignition, the conductor rotation type ignition signal generator is provided outside the rotor to obtain an ignition signal. However, the ignition signal generator is high in cost and requires a small installation space. Not only is it necessary, but also its mounting requires precise positioning, which requires man-hours. Therefore,
As shown in Japanese Patent Publication No. 49-46163, the signal coil is divided and wound on two salient poles of a core having a large number of salient poles, and the number of turns of these divided windings is the same. Using a magnet rotor that is connected in series by changing the winding direction and has a magnetic pole change that appears in most of the circumferential direction but no magnetic pole change in a part of the circumferential direction,
It is considered to obtain a signal voltage of one cycle per revolution to obtain an ignition spark once per revolution.

[Problems to be solved by the invention]

However, in the above-mentioned conventional device, the output voltages in the unnecessary portions are set to zero by canceling each other with the voltages having the opposite polarities generated in the divided and wound signal coils, and thus the output voltage in the unnecessary portion is skipped. Since the signal coil must be divided and wound around two salient poles, it has the disadvantages of complicated structure, poor workability, and high cost. Moreover, the ignition timing during normal rotation of the internal combustion engine is set to before top dead center (BTDC). If set to around 20 °, when the internal combustion engine reverses, ignition will occur at around BTDC 60 °,
The two-cycle engine had a drawback that it could not be used for the two-cycle engine because the reverse rotation continued. Also, at least 3 poles are required for ignition, which is disadvantageous for obtaining a large output.

Therefore, it is an object of the present invention not only to enable one rotation and one ignition with a simple and inexpensive structure, but also to be able to be used not only for a four-cycle engine but also for a two-cycle engine without continuing reverse rotation in a two-cycle engine.

[Means for solving problems]

Therefore, the present invention has a plurality of salient poles (3a to 3k) provided at predetermined intervals on the circumference.
And two adjacent salient poles (3a, 3b) of the salient poles
One ignition power supply coil (4) is wound over the above, and one signal coil (5) is provided in only one of these two salient poles or in the bridging magnetic path portion bridging between these salient poles. A stator wound with the output coil (7) wound on the remaining salient poles (3c to 3k) and a plurality of magnetic poles that rotate and move in opposition to the salient poles;
The plurality of magnetic poles have different polarities (2d to
2l) is arranged over a predetermined range, and the remaining range is arranged so that the same polarity (2a to 2c) continuously appears corresponding to several of the alternating magnetic poles. The technical means of a magneto-generator for an internal combustion engine equipped with is adopted.

The reference numerals in parentheses are the reference numerals of corresponding parts in the embodiments described later.

[Action]

As a result, it is not necessary to divide the signal coil for winding, and the ignition timing at the time of reverse rotation can be greatly shifted after top dead center.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. In FIG. 1, 1 is an iron bowl (rotor) made of a magnetic material,
It is directly connected to a crankshaft of an internal combustion engine and driven to rotate. 2 is a ring-shaped magnet which is arranged and fixed on the inner circumference of the iron bowl 1, and is magnetized in the radial direction. It is magnetized so that the N pole appears continuously from 2a to 2c, and 2d to 2l. Up to the above, the S pole and the N pole are alternately magnetized so that the continuous 3 poles of the 12 poles are magnetized to the same pole. In this embodiment, a rotor is constituted by the iron bowl 1 and the magnet 2 described above. 3 is a star-shaped core formed by laminating magnetic plates, and has 12 salient poles 3a to 3l formed at substantially equal intervals protruding outward in the radial direction. 3a and 3l are salient poles for ignition, On the other hand, a signal coil 5 is wound on one side 3l, and a capacitor charging coil 4 which is a coil for an ignition power source is wound on the outer diameter side or the inner diameter side thereof so as to extend over two poles. The other salient poles 3b to 3k are salient poles for output windings for lighting or battery charging. And each salient pole 3a
The outer peripheral surface of ~ 3l is opposed to the inner peripheral surface of the magnet 2 with a slight gap. Reference numeral 6 is a screw for fastening and fixing the core 3 to the engine. Reference numeral 7 is an output coil for lighting or battery charging, which is wound around salient poles 3b to 3k for output winding and connected in series with each other. In this embodiment, the core 3, the coils 4, 5,
The stator is composed of 7. The arrow in the figure indicates the rotation direction of the rotor 1.

Figure 2 is an electric circuit diagram, 10,13,15 are rectifying diodes,
Reference numeral 11 is an ignition capacitor, 12 is an ignition coil, 12a is its primary coil, 12b is its secondary coil, 14 is a resistor, 16 is an ignition thyristor, and 17 is an ignition plug.

FIG. 3 shows the waveform of each part in the above embodiment, (A) is the waveform of the magnetic flux (flux) interlinking with the signal coil 5,
(B) is the voltage generated by this coil 5, (C) is the effective magnetic flux waveform that links the capacitor charging coil 4, (D) is the voltage generated by this coil 4, and (E) is the charging voltage for the ignition capacitor 11. Each is shown.

In the above configuration, when the rotor 1 rotates, the capacitor charging coil 4 is formed by winding one coil across two poles of two adjacent salient poles 3a and 3l. , 3l are opposed to the portions (2d to 2l) where the magnetic change of the magnet 2 appears alternately, the flux passing through one salient pole 3a and the flux passing through the other salient pole 3l are opposite to each other and cancel each other. As a result, the flux is not linked to the capacitor charging coil 4, which is the same. Further, in the portion (2a to 2c) where the N pole appears continuously on the magnet 2, the flux passing through one salient pole 3a and the flux passing through the other salient pole 3l are in the same direction, and the capacitor charging coil 4 has these fluxes. Both fluxes are added, and a large amount of flux is interlinked as shown in FIG. 3 (C), and the forward voltage as shown in FIG. 3 (D).
D ₁ and negative voltage D ₂ are generated, of which positive voltage D ₁
Then, the ignition capacitor 11 is charged as shown in FIG. 3 (E) through the diode 10, the capacitor 11, the coil 12a, and the ground.

Further, when the signal coil 5 faces the portions (2c to 2l, 2a) where the magnetic changes of the magnet appear alternately, a voltage is generated,
No voltage is generated at the portion (2b) where the N pole appears continuously on the magnet 2, the magnetic flux waveform becomes as shown in FIG. 3A, the voltage waveform becomes as shown in FIG. 3B, and the forward voltage is the ignition signal. Is applied to the gate of the thyristor 16. Then, when the forward voltage B ₁ is generated immediately after the ignition capacitor 11 is charged,
A current flows through the circuit of the signal coil 5 → the resistor 14 → the earth, and when the voltage between the terminals of the resistor 14, that is, the gate-cathode voltage of the ignition thyristor 16 reaches a predetermined value, the thyristor 16 becomes conductive. When the thyristor 16 conducts in this way, the electric charge charged in the capacitor 11 is rapidly discharged in the circuit of the thyristor 16 → the primary coil 12a of the ignition coil 12 → the capacitor 11 to the secondary coil 12b of the ignition coil 12. A high voltage is generated and the spark plug 17 is ignited.

After that, even if the rotor 1 is rotated and a positive voltage is generated in the signal coil 5 to make the thyristor 16 conductive, the capacitor 1
Since 11 is not charged, the ignition operation is not performed and it becomes a reactive voltage. By repeating the above operation, it is possible to obtain a non-contact ignition device that ignites once per revolution of the internal combustion engine (rotor 1).

When the rotor 1 rotates in the reverse direction, the polarities of the coils in FIG. 3 are reversed, and the passage of time t is in the direction opposite to the arrow. As a result, the ignition capacitor 11 is shown in FIG.
It is charged with a voltage equivalent to D ₂ of Fig. 3 and is ignited in Fig. 3 (B).
At a voltage corresponding to B ₂ . In other words, if the ignition timing during forward rotation is set to a very general BTDC of 20 °, it is possible to ignite around 90 ° after top dead center (ATDC) during reverse rotation, which allows the reverse rotation of a two-cycle engine to continue. No, it can be used not only for a 4-cycle engine but also for a 2-cycle engine.

FIG. 4 shows another embodiment of the present invention, in which the salient poles 3a, 3l for ignition are bridged to the outer diameter side of the salient poles 3a, 3l.
One bridge magnetic path part 3a1 is fitted and fixed, and this bridge magnetic path part 3a1
The signal coil 5 is wound around the outer circumference of the signal coil, and an output similar to that shown in FIG.

Further, instead of each of the above-described embodiments, the following configuration can be adopted.

(1) A multi-pole generator other than 12 poles may be used.

(2) An example in which the continuous same number of poles is N poles and 3 poles is shown, but other pole numbers may be used and the polarity may be S poles.

(3) The present invention can be applied to a transistor type ignition device in which the primary current of the ignition coil 12 supplied from the generator coil is directly continued by a transistor.

〔The invention's effect〕

As described above, in the present invention, it is not necessary to divide and wind the signal coil, and not only is it possible to ignite one rotation per rotation with a simple and inexpensive structure, but also the ignition timing at the time of reverse rotation is set to the top dead center. Since it can be significantly shifted later, the reverse rotation does not continue even in a 2-cycle engine, it can be used not only in a 4-cycle engine but also in a 2-cycle engine, and the magnetic flux is reduced to zero the output voltage in unnecessary parts. Since the principle is canceled out, no voltage is generated in the ignition power supply coil. Therefore, there is an excellent effect that there is no risk of dielectric breakdown due to no-load high voltage generated in the ignition power supply coil and the signal coil.

[Brief description of drawings]

1 is a partial sectional plan view showing an embodiment of the generator of the present invention, FIG. 2 is an electric circuit diagram showing an ignition device to which the generator shown in FIG. 1 is applied, and FIG. 3 is a device shown in FIG. 4 is a partial sectional plan view showing another embodiment of the generator of the present invention. 1 …… iron bowl (rotor), 2 …… magnet, 3 …… core, 3a ～ 3l…
… Salient pole, 4 …… Capacitor charging coil that forms the ignition power supply coil, 5 …… Signal coil, 3a1 …… Bridging magnetic path section.

Claims (1)

[Claims] 1. A plurality of salient poles (3a to 3k) provided at predetermined intervals on the circumference, and one salient pole extending over two adjacent salient poles (3a, 3b) among the salient poles. The ignition power supply coil (4) is wound, and one signal coil (5) is wound on only one of these two salient poles or on the bridging magnetic path portion bridging between these salient poles. Remaining salient poles (3c-3k)
A stator around which an output coil (7) is wound, and a plurality of magnetic poles that rotate to face the salient poles,
The plurality of magnetic poles have different polarities (2d to
2l) is arranged over a predetermined range, and the remaining range is arranged so that the same polarity (2a to 2c) continuously appears corresponding to several of the alternating magnetic poles. An internal combustion engine magnet generator.