JPS6020586B2 - Engine ignition power distributor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine ignition power distribution device, and more particularly to an improvement of an ignition signal generating device inside the power distribution device.

2. Description of the Related Art Conventionally, there is one shown in FIG. 1 as an engine point power distributor of this type.

In the figure, reference numeral 1 denotes a housing of a power distributor, which is integrally formed of a material such as aluminum. Reference numeral 2 denotes a rotating shaft rotatably supported by the housing 1, and a cylinder 3 made of a magnetic material is attached thereto, and the cylinder 3 has a plurality of protrusions (not shown) corresponding to the number of engine cylinders. A signal row 4 on the outer periphery is iron-bonded.

A fixed plate 5 is fixed to the housing 1, and a movable plate 6 is rotatably supported on the fixed plate 5.

This movable plate 6 is rotated via a link 8 by a vacuum advance device 7 that responds to engine intake negative pressure. Also, on the movable plate 6 are a permanent magnet 9 and a protrusion (not shown) corresponding to the protrusion of the signal rotor 4 extending in the enemy direction.
Stators 10 having an inner periphery are stacked and fixed. 11 is a signal coil installed in a magnetic circuit including a signal rotor 4, a stator 10, and a permanent magnet 9; winding 1;
2 is wound.

13 is an ignition unit installed and fixed on the seat of the UJINGU, which is composed of a semiconductor amplifier circuit that operates in response to the ignition signal voltage induced in the signal coil 11, and is compactly constructed using an IC or the like.

Reference numeral 14 denotes a governor advance device installed between the rotating shaft 2 and the cylindrical body 3. Reference numeral 15 denotes a power distribution rotor fixed to the base of the governor advance device 14, to which a rotor electrode 16 is fixed.

Reference numeral 17 denotes a power distribution cap fixed to the housing to close the inside thereof, and includes a center electrode 18 to which the secondary side of an ignition coil (not shown) is connected, and a peripheral electrode 19 to which the rotor electrode 16 can face each other through a small gap. are buried together.

20' is a contact carbon whose one end is in contact with the center electrode 18 and the other end is in sliding contact with the rotor electrode 16.

Next, the operation will be explained. When the rotating shaft 2 is rotated by the engine and the signal rotor 4 rotates, the magnetic flux of the permanent magnet 9 changes due to the cooperative action of the protrusions on the outer circumference of the signal rotor 4 and the protrusions on the inner circumference of the stator 10, and this change in magnetic flux causes the signal rotor to rotate. An ignition signal voltage synchronized with the rotation of the engine is induced in the coil 11.

This ignition signal voltage is input to the input section of the ignition unit 13, controls the current applied to the ignition coil at the ignition timing based on the ignition signal voltage, and induces a matchlock pressure on the secondary side of the ignition coil. This ignition voltage is led to the center electrode 18 and distributed via the rotor electrode 16 to each peripheral electrode 19 in turn. Here, the magnetic circuit parts for generating the ignition signal voltage are each constructed independently, and a minute gap is formed between them, but each part has its own vibration due to engine vibrations and the like. Therefore, in addition to changes in the magnetic flux due to engine rotation, the magnetic flux interlinking the signal coil 11 changes due to these relative changes. Therefore, a noise waveform may be superimposed on the normal ignition signal voltage.
This is mainly due to leakage magnetic flux. That is, apart from the magnetic circuit of permanent magnet 9 → stator 10 → stator protrusion → signal rotor 4 → cylinder body → movable plate 6 → permanent magnet 9, the permanent magnet 9 directly moves to the movable plate 6 and also moves via the stator 10. to the plate 6 and via the stator 10 to the movable plate 6 and to the stator 1
It is assumed that the magnetic flux flows through the movable plate 6, the governor advance device 14, and directly to the cylindrical body 3 via 0. When the protrusions of the signal rotor 4 and the protrusions of the stator 10 face each other, the magnetic flux is relatively concentrated in the regular loop, but as the engine rotates, the signal rotor 4 rotates and the protrusions are brought to a position where they no longer face each other. When this occurs, the influence of these leakage magnetic flux becomes significant. At this time, the ignition signal voltage waveform is near OV, and is at a position that influences whether the ignition unit 13 is turned on or off. Therefore, due to the superposition of signal noise, the ignition unit 13 will ignite at a time other than the normal time.This means that sparks will fly at a time other than the normal ignition time for the engine, resulting in engine trouble. This invention was made to eliminate the above-mentioned drawbacks of the conventional ones, and uses an intermediate plate attached to either pole of a permanent magnet to achieve the above-mentioned signal loss. A gap larger than the minimum gap between the stators and smaller than the maximum gap is formed across both poles of the permanent magnet, and the light is arranged in the gap at the midpoint of the winding length of the signal coil. By preventing the influence of leakage magnetic flux on the coil, the purpose is to eliminate noise superimposition on the signal waveform due to engine vibration, etc., and to obtain an engine ignition power distributor with stable performance.

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

In FIG. 2, the same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted. Reference numeral 21 denotes an intermediate plate made of a magnetic material that is closely attached to the permanent magnet 9 and is disposed at a position opposite to the stator 10, and one end thereof has a gap shown by 21a between it and the stator 10. It faces the stator 10.

FIG. 3 shows the rotational relationship between the signal rotor 4 and the stator 10. When the rotating shaft 2 is rotated by the engine,
The cylindrical body 3 rotates, and the signal rotor 4 attached to the cylindrical body 3 rotates. At this time, the gap between the signal rotor 4 and the stator 10 changes from the minimum gap 4a to the maximum gap 4b. This operation is repeated according to the number of cylinders, causing a change in the magnetic flux for causing the signal coil 11 to generate an ignition signal voltage. In other words, when the gap is small like 4a, the amount of magnetic flux is large, and conversely when the gap is small like 4b
As the gap becomes larger, the magnetic flux between them decreases. Here, if the gap 21a between the intermediate plate 21 and the stator 10 is configured to be sufficiently larger than the minimum gap 4a and smaller than the maximum gap 4b,
When the signal rotor 4 is at the position where the maximum gap 4b is formed between the signal rotor 4 and the stator 10, most of the magnetic flux flows through the gap 21a between the stator 10 and the intermediate plate 21, so a regular magnetic circuit is not formed. Leakage magnetic flux is also reduced.

Furthermore, when the signal rotor 4 is brought to a position where the minimum gap 4a is formed, magnetic flux is concentrated in the regular magnetic circuit, and leakage magnetic flux and the flow of magnetic flux to the intermediate plate 21 are also reduced. Therefore, when the ignition signal voltage waveform force ION is near, that is, near where the signal rotor 4 and the stator 10 form the maximum gap 4b, even if the gap of each part changes due to the natural vibration of each part due to engine vibration, etc. Since most of the magnetic flux flows through the gap 21a between the stator 10 and the intermediate plate 21, the magnetic flux fluctuation factors that affect the signal coil 11 are removed, and regular magnetic flux fluctuations are guaranteed. By the way, apart from this, the coil 11 may self-vibrate and perform a relative movement within a fixed magnetic flux as if the magnetic flux were fluctuating.

That is, if there is an eccentricity in the flow of magnetic flux as shown in FIG. 4, the induced voltage will be biased, and a noise voltage corresponding to the overall vibration may be induced. In order to prevent this, in this embodiment, as shown in FIG.
A is arranged at the midpoint position of the winding length of the coil winding 12 of the signal coil 11. In this way, even if the coil winding 12 moves in the magnetic field due to the self-vibration of the coil 11,
There is little increase or decrease in the interlinking magnetic flux, and the factors that cause the voltage waveform to fluctuate are reduced overall. In this way, a magnetic circuit is constructed that prevents the influence of various magnetic flux fluctuations. moreover,
By extending the end of the intermediate plate 21 and fixing it to the spinning spindle 8a of the link 8 connected from the vacuum advance device 7, it is possible to prevent the link 8 from coming off. Retaining ring used 8
b etc. can be omitted. As described above, according to the present invention, by reducing the influence of leakage magnetic flux other than the normal magnetic flux distribution, it is possible to prevent changes in magnetic flux due to vibration etc. from appearing as noise in the signal voltage waveform, thereby improving performance. An excellent engine ignition power distribution device can be provided.

In addition, since the gap is located at the midpoint of the signal coil's winding length, even if the coil winding moves in the magnetic field due to self-vibration of the signal coil, there is little increase or decrease in the interlinking magnetic flux, and the overall Another feature is that the factors that cause the voltage waveform to fluctuate are reduced. Furthermore, when the ignition signal voltage waveform is near ON, that is, near where the signal rotor and stator form the maximum gap, the magnetic flux remains stable even if the gap of each part fluctuates due to the natural vibration of each part due to engine vibration. −
Most of it flows into the gap between the evening and intermediate plates, so
Magnetic flux fluctuation factors that affect the signal coil are removed, and regular magnetic flux fluctuations are guaranteed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a conventional engine ignition power distributor, FIG. 2 is a cross-sectional view showing an embodiment of the engine ignition power distributor of the present invention, and FIG. 4 is a sectional view showing the main part of FIG. 2. 2... Rotating shaft, 4... Signal rotor, 4
a...Minimum gap, 4b...Maximum gap, 9...Permanent magnet, IQ...Stator, 11...Signal coil, 21a・・・・・・
··gap. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Figure 3 Figure 1 Figure 2

Claims (1)

[Claims] 1. A signal rotor that rotates in conjunction with a rotating shaft, a stator disposed on the outer periphery of this rotor, a permanent magnet that forms a magnetic circuit together with the signal rotor and stator, and the magnetic flux of the magnetic circuit interlinks with each other. and a signal coil, the gap between the signal rotor and the stator is changed according to the rotation of the signal rotor, and the ignition signal voltage is induced in the signal coil by a change in magnetic flux based on the change in the gap. In a power distribution device, a gap larger than the minimum gap and smaller than the maximum gap between the signal rotor and the stator is connected to both poles of the permanent magnet using an intermediate plate that is brought into contact with either pole of the permanent magnet. formed across the
An engine ignition power distributor characterized in that the gap is located at the midpoint of the winding length of the signal coil.