JPS6025628B2 - Distributor for multi-cylinder internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an ignition device equipped with an electronically controlled switch, which includes a power distribution section for distributing a secondary voltage generated in an ignition coil to predetermined spark plugs. The present invention relates to a distributor for a cylinder internal combustion engine, and particularly to a distributor suitable for use in an internal combustion engine having an even number of cylinders of six or more cylinders.

[Background of the invention]

Fig. 1 shows a circuit diagram of a conventional distributor for a six-cylinder internal combustion engine, where P and P6 are spark plugs for each cylinder,
1 is the ignition coil that generates the secondary voltage, 2 is the ignition coil 1
3 is a continuation switch that continuously generates a secondary voltage to the ignition coil 1, and 4 is a power distribution unit that distributes the secondary voltage generated in the ignition coil to the spark plug, which is a spark discharge type rotary switch.

This rotary switch has a fixed electrode 5 connected to the ignition coil 1 via a high-voltage electric wire 8, a rotor head electrode 6 that rotates in contact with the electrode 5, and connected to each spark plug. It has discharge electrodes 7a, 7b, 7c, 7d, 7e, and 7f arranged at equal intervals on a circular arc. Reference numeral 9 denotes a high-voltage electric wire that connects each discharge electrode to a corresponding spark plug.

As shown in the figure, when the intermittent switch 3 is closed with the rotor head electrode 6 of the power distribution section 4 facing the discharge electrode 7a, the secondary voltage generated in the ignition coil 1 is transferred to the high-voltage electric wire 8 and the central crab pole. 5 to the rotor head electrode 6, and is distributed to a discharge electrode 7a connected to a predetermined spark plug P.

When the ignition of the cylinder in the spark plug P is completed, the rotor head electrode 6 rotates in the direction of the arrow and faces the adjacent discharge electrode 7b, distributing the secondary voltage in the same manner as described above.
By the way, in this type of internal combustion engine, the ignition timing is automatically changed (automatic advance) by a vacuum controller or an electronic control device using a microcomputer for the purpose of improving output, saving fuel, purifying exhaust gas, etc. It is.

The above-mentioned FIG. 1 schematically shows a secondary distributor, and 3 in FIG. 1 abstractly represents a switch that cuts on and off the primary current of the ignition coil.

To specifically schematically show the disconnection switch 3, it can be roughly divided into an old-style device (Fig. 2) equipped with a disconnection switch 3' that has mechanical contacts, and an electronic control device that does not have mechanical contacts. There is a new type device (Fig. 3) equipped with a type non-contact switch 3c. The mechanical ignition device (Fig. 3) has a structure in which a contact play force 3a is pushed by a cam 3b to open and close it. It's in sync.

The mechanical intermittent switch 3a shown in FIG.
a is turned concentrically with the cam 3b to advance or retard the phase of its opening/closing operation. Electronically controlled ignition device (3rd
Although the device shown in Fig. 2 is a new type of device compared to the mechanical type described above (Fig. 2), it is already publicly known.

The device of the present invention is applied to an electronically controlled ignition device (FIG. 3) as will be described in detail later, but FIG. 3 shows a conventional electronically controlled ignition device to which the present invention is not applied. Second
The rotor head electrode 6 shown in the figure (mechanical type) is provided coaxially with the cam 3b and rotates together.

Further, the discharge electrodes 7a to 7f are provided in the same case as the contact play force 3a, and the phase can be advanced or delayed together. Therefore, the opening/closing operation of the contact play force 3a is advanced and delayed together with the discharge electrodes 7a to 7f,
There is no possibility of a timing discrepancy between the two. On the other hand, the conventional electronically controlled distributor (Fig. 3) generates a spark by opening and closing the primary circuit of the ignition coil 1 using an electronically controlled intermittent switch 3'', and is equipped with an electronically controlled intermittent switch 3''. The microphone 0 computer 3d electromagnetically detects the rotation of the engine ENG and connects the non-contact switch 3.
c, and advances (advances) or retards the phase of the opening/closing operation according to the load condition (including rotational speed) of the engine ENG.

In the electronically controlled automatic advance angle device (Fig. 3) described above, since the microcomputer 3d performs the advance action, it is necessary to provide a cam 3d as in the mechanical advance angle device (Fig. 2). Therefore, there is no means for automatically adjusting the phase of the cam (for example, a far-D balance weight or a vacuum controller).

The conventional electronically controlled distributor device described above (Fig. 3) has various advantages such as good control characteristics, and has come to occupy the mainstream position in spark ignition engines. As described in 2.2, there remains a technical problem in that there is a risk of incorrect power distribution.

That is, in FIG. 3, the rotor head electrode 6 rotates in synchronization with the crankshaft, and the discharge electrodes 7a to 7f are not rotated to change the phase.

Furthermore, the microcomputer 3d advances or delays the phase of the non-contact switch 3c, and as a result, as described below, the rotor head electrode 6 and the discharge electrode (any one of 7a to 7f) are opposed to each other. Timing and opening/closing operation of the non-contact switch 3c (opening operation means generation of a spark electrode)
This causes a phase shift between the two. Therefore, when the ignition timing is advanced by a phase angle of 8 by the microcomputer 3d, the rotor head electrode 6 and the discharge electrode (discharge electrode 7a is shown in the figure) are opposed to each other by the ignition advance angle of 8 as shown in FIG. Misalignment occurs.

By the way, the size of the arc in which each discharge electrode is arranged is limited by the installation space of the distributor, and the distance between each discharge electrode is also small, so as mentioned above, the rotor head electrode 6 and the discharge electrode 7a are If there is a deviation in the opposing positions, the distance L between the rotor head electrode 6 and the adjacent discharge electrode 7b becomes shorter.

However, in the conventional distributor, when the ignition advance angle is increased by the electronic control device (6
In a cylinder internal combustion engine, when the ignition advance angle is about 30 degrees), a predetermined spark plug P does not discharge, but the spark plug P4, which precedes the spark plug P by one in terms of the discharge order (so-called ignition order), discharges. This could lead to incorrect power distribution.

[Object of the Invention] An object of the present invention is to provide a distributor for a multi-cylinder internal combustion engine that can prevent erroneous power distribution caused by the advance action of an electronically controlled ignition device in the prior art.

[Summary of the Invention] The basic principle of the present invention, which was created to achieve the above object, will be explained next while taking into account the causes of erroneous power distribution.

In an ignition system equipped with a mechanical advance device, the cam that opens and closes the contact play force and the rotating electrode for power distribution (rotator head electrode) advance the angle together.
Ignition system equipped with an electronically controlled advance device (conventional type, Fig. 3)
In this case, the cause of the deviation is that the opening and closing of the non-contact switch 3C advances the angle, but the rotor head electrode 6 does not advance the angle.

As explained with reference to FIG. 4, this misalignment causes sparks to fly between the rotor head electrode 6 and the discharge electrode 7b adjacent to the discharge electrode 7a to which power is to be distributed, resulting in incorrect power distribution.
Focusing on these causes, the present invention divides the spark-type rotary switch portion, which is composed of a rotor head electrode and a discharge electrode, into two parts. Each of these two spark discharge type rotary switches is provided with discharge electrodes (for example, discharge electrodes 7a, 7c, and 7e in FIG. Tsuoki's group of discharge electrode comrades, and 7b, 7d
, 7f (groups of alternate discharge electrodes) are arranged. Then, another spark discharge type rotary switch is provided to alternately distribute spark voltage to the two spark discharge type rotary switches grouped as described above, and these rotary switches are connected to the crankshaft by the crankshaft. The rotational drive is performed in synchronization with the rotation angle without providing an advance means. Based on the above-mentioned principle, in order to prevent incorrect power distribution in an electronically controlled distributor, the distributor of the present invention distributes the secondary voltage generated in the ignition coil of an ignition device equipped with an electronically controlled switch to a plurality of ignitions. In a distributor for a multi-cylinder internal combustion engine, which includes a power distribution section for sequentially distributing power to plugs, the power distribution section is configured to (i) It is divided into a power distribution section (odd) and (ii) a power distribution section (even) for distributing secondary voltage to spark plugs installed in even-numbered cylinders with respect to the ignition order. A switching means is provided for alternately distributing the voltage to the two power distribution sections (odd) and the same (corner), and this switching means is driven by the crankshaft and rotates in synchronization with the crankshaft by a spark discharge type rotary switch. Configure.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described based on the drawings.

FIG. 5 shows a circuit diagram of a distributor for a six-cylinder internal combustion engine, where P, to P6 are spark plugs for each cylinder, 1 is an ignition coil, 2 is a battery, and 3 is an on/off switch.

The ignition order of this six-cylinder engine is the order of spark plugs P, P5, P3, P6, P2, and P4.

Therefore, regarding the ignition order, P,, P3, and P2 are odd numbered, and P5, P6, and P4 are even numbered. A power distribution section (odd) 10 that distributes secondary voltage to the above-mentioned odd-numbered spark plugs P, , P3, P2, and an even-numbered spark plug P5.
, P6, and P4 are provided with a power distribution section (even) 11 that distributes the secondary voltage. The power distribution unit (odd) 10 is connected to a fixed electrode 12, a rotor head electrode 13 that rotates in contact with the fixed electrode 12, and three spark plugs P, P3, and P2 via high-voltage electric wires 21. , and three discharge electrodes 14a, 14c, and 14b arranged at equal intervals (12) on an arc centered on the rotation center of the rotor head electrode 13.

The other power distribution section (corner) 11 includes a fixed electrode 15, a rotor head electrode 16 that rotates in contact with the fixed electrode 15, and a high-voltage electric wire 2 connected to the remaining three spark plugs P5, P6, and P4.
2, and the rotor head electrode 16
It has three discharge electrodes 14f, 14e, and 14d arranged at equal intervals (120o) on an arc centered on the rotation center of. Reference numeral 17 denotes a switching means for switching and distributing the secondary voltage applied from the ignition coil to the two power distribution sections (odd) 10 and the same (corner) 11, and is connected to the ignition coil 1 via a high-voltage electric wire 23. an electrode 18; a movable electrode 19 having three electrode heads 19a, 19b, and 19c that rotate in contact with the fixed electrode 18 and maintain an interval of 120 degrees from each other;
They are connected to the fixed electrodes 12 and 15 of both the power distribution parts 10 and 11 via high-voltage electric wires 24 and 25, respectively, and are arranged at equal intervals (18 times) on an arc centered on the rotation center of the movable electrode 19.
The above-mentioned movable electrode 19 having two discharge electrodes 20a and 20b arranged in the movable electrode 19 has a structure in which it is driven by a crankshaft via a gear means.

In both the power distribution units 10, 11 and the switching means 17, each rotor head electrode 13, 16 and the movable electrode 19 rotate synchronously in the arrow direction while maintaining the illustrated positional relationship.
That is, when the rotor head electrode 13 faces the discharge electrode 14a, the rotor head electrode 16 is located between the discharge electrodes 12d and 12f (600 degrees offset from the rotor head electrode 13), and the movable electrode 19 has its electrode head 19a facing the discharge electrode. It is located opposite the electrode 20a and rotates in synchronization with the direction of the arrow. As described above, the switching means 17 constructed according to the present invention is a spark discharge type rotary switch driven by the crankshaft and rotated in synchronization with the crankshaft. Since the distributor of this embodiment has the above-mentioned foundation, it is in the state shown in FIG. 19 electrode heads 19
a is facing the discharge electrode 20a, when a secondary voltage is generated in the ignition coil 1 due to the intermittent switch 3'', the secondary voltage is transmitted from the high-voltage electric wire 23 to the fixed electrode of the switching means 17. 18 - electrode head 19a of movable electrode 19 - discharge electrode 2
It is applied to the spark plug P via the high voltage electric wire 24, the fixed electrode 12 of the power distribution section 10, the rotor head electrode 13, the discharge electrode 14a, and the high voltage electric wire 21, thereby igniting the air-fuel mixture in that cylinder. When the ignition in the spark plug P is completed, the rotor head electrodes 13 and 16 of both power distribution parts (odd) 10 and the same (even) 11 and the movable electrode 1 of the sliding door means 17
9 is rotated 60 degrees in the direction of the arrow in synchronization with the state shown in FIG. That is, the rotor head electrode 16 of the power distribution section (corner) 11 faces the discharge electrode 14f, and the switching means 17
The electrode head 19c of the rotating electrode 19 faces the discharge electrode 20b. As a result, when a secondary voltage is generated in the ignition coil 1, the secondary voltage is transmitted from the high voltage electric wire 23 to the fixed electrode 18 of the sliding means 17 to the electrode head 19c of the movable electrode 19 to the discharge electrode 20.
It is applied to the spark plug P5 via the high voltage wire 25, the fixed electrode 15 of the power distribution section 11, the rotor head electrode 16, the discharge electrode 14f, and the high voltage wire 22 to ignite the cylinder.
In this way, every 600 rotations of the rotor head electrodes 13, 16 and the movable electrode 19, the power distribution part (odd) 10 and the same (monk) 1
1 and 1 operate alternately to distribute power to a predetermined spark plug as in the conventional case.

In the distributor of the present invention which distributes power as described above, when the ignition timing is changed by the electronic control device, the opposed positions of the rotor head electrode and the discharge electrode in the power distribution section are shifted as in the prior art.

Therefore, in the distributor of the present invention, the power distribution section is divided into two parts, and three discharge electrodes connected to the spark plugs are arranged in each of the power distribution parts 10 and 11 at equal intervals. The discharge distance (A, B in FIG. 3) between the discharge electrode and a single rotor head can be made significantly longer than in the prior art, thereby eliminating the possibility of erroneous power distribution. Furthermore, the rotor head electrodes 13 and 16 of both power distribution sections 10 and 11 and the movable electrode 19 of the switching means 17 can be provided on a common rotation axis, thereby allowing the power distribution section to be sufficiently arranged within the existing installation space. Furthermore, even if the power distribution section is made smaller than that of the secondary technology, there is also the effect of preventing the occurrence of erroneous distribution fins. Next, a specific structure in which the distributor of the present invention is installed in an existing engine will be explained based on FIG. 7.

S is a rotating shaft taken out from the engine side, C is a cap attached to the housing, and each discharge electrode (discharge electrode 14a is shown in the figure) of the power distribution section (odd) 10 in FIG. 5 is attached to the cap C. ), fixed electrode 12, and power distribution section (monk) 1
1 (discharge electrode 14f is shown in the figure) and fixed electrode 15, and each discharge electrode 20a, 20b of switching means 17.
and a fixed electrode 18 are respectively attached. Each discharge electrode of the power distribution section (odd) 10, each discharge electrode of the power distribution section 11, and each discharge electrode of the switching means 17 are arranged on the same D circle with different ridges centered on the rotation axis S, and on different same planes. are placed on top of each other. Further, the fixed electrode 15 of the power distribution section (flies) 11 is arranged on the center of rotation axis S, and the fixed electrode 12 of the power distribution section (odd) 10 is arranged at a position off the axis, and the switching means 17 fixed electrodes 18 are the fixed electrodes 12
It is located further away. A rotor head electrode mounting assembly 30 in both power distribution sections and a movable electrode mounting assembly 31 in the switching means are interposed on the rotating shaft S. On the upper surface of the cylindrical upper part of the assembly 30, there is a rotor head electrode 13 having an annular part that is always in contact with the fixed electrode 12, and in the lower part,
A rotor head electrode 15 that is in constant contact with the fixed electrode 15 is attached to each of the rotor head electrodes 15 . Further, a movable electrode 19 having an annular portion that is always in contact with the fixed electrode 18 is attached to the lower surface of the assembly 31. In addition, 23 in the figure is the fixed electrode 1
8 is a high-voltage electric wire connecting the ignition coil, 24 and 25 are high-voltage electric wires connecting the discharge electrodes 20a and 20b to the fixed electrodes 12 and 15, respectively, and 21 and 22 are the discharge electrodes 14a and 14f.
The figure shows the high-voltage wires that connect to the spark plugs. In the above-described distributor, the secondary voltage generated in the ignition coil is transmitted to the movable electrode 19 via the high-voltage electric wire 23 and the fixed electrode 18. When the movable electrode 19 faces one discharge electrode 20a and the rotor head electrode 13 faces the discharge electrode 14a, power is distributed to the discharge electrode 14a. Next, the rotation axis S rotates 60 degrees so that the movable electrode 18 faces the other discharge electrode 20b, and the rotor head electrode 15
When facing the discharge electrode 14f, power can be distributed to the discharge electrode 14f to achieve the intended purpose. FIG. 8 shows a distributor for an eight-cylinder internal combustion engine as another embodiment of the present invention, in which one power distribution section (odd) 100 rotates in contact with a fixed electrode 120 and the fixed electrode 1201. rotor head electrode 130 and four spark plugs P,,
Four discharge electrodes 140a, 140b are connected to P4, P6, and P7 via high-voltage electric wires 210, respectively, and are arranged at equal intervals (900) on an arc centered on the rotation center of the rotor head electrode 130. , 140c, and 140d.

In addition, the other power distribution (even) 1 10 has a fixed electrode 150,
The rotor head electrode 160 rotates in contact with the fixed electrode 1501, and the remaining four spark plugs P6, P3, P5,
Four discharge electrodes 140e are connected to P2 via high-voltage electric wires 220 and arranged at equal intervals (90o) on an arc centered on the rotation center of the row head electrode 160.
, 140f, 140g, and 140h. Switching means 17 for switching and distributing the secondary voltage applied from the ignition coil to both power distribution parts, high-voltage electric wire 2 to the ignition coil
A fixed electrode 180 connected via 30, and the fixed electrode 1
8. Rotating in contact with each other and keeping a distance of 90o from each other 4
Book electrode heads 190a, 190b, 190c, 190
a movable electrode 190 with
0 fixed electrodes 120, 1501 and high voltage electric wires 240, 2
two discharge electrodes 2 connected to each other via 50 and disposed on an arc centered on the rotation center of the movable electrode 190;
00a and 200b. Both opening poles 20
Among 0a and 200b, the discharge electrode 200b is the discharge electrode 200
It is provided at a position of 450 with respect to the line connecting a and the fixed electrode 180. In both the power distribution sections 100, 110 and the sliding means 170, each rotor head electrode 130
, 160 and the movable electrode 1601 rotate in synchronization in the direction of the arrow while maintaining the illustrated positional relationship. That is, when the rotor head electrode 130 faces the discharge electrode 140a, the rotor head electrode 160 is located between the discharge electrodes 140e and 140b, and the movable electrode 190 is located between the discharge electrodes 140a and 140a.
is located opposite the discharge electrode 200a and rotates in synchronization in the direction of the arrow. In the figure, 2 indicates a battery, and 3 indicates an on/off switch. Outside the above-mentioned distribution, when in the state shown in FIG. Electrode 200a~
High-voltage electric wire 240 - fixed electrode 120 of power distribution section (odd) 100
~ The rotor head electrode 130 ~ The discharge electrode 140a is discharged to the spark plug P via the high voltage electric wire 210.

When the ignition of the cylinder at the spark plug P is completed, each rotor head electrode 130, 160 and the movable electrode 1
90 are rotated synchronously to reach the state shown in FIG. That is, the rotor head electrode 160 of the power distribution section (corner) 110 faces the discharge electrode 140e, and the electrode head 190b of the movable electrode 190 of the switching means 170 faces the discharge electrode 200b, so that the secondary voltage of the ignition coil 1 is applied to the ignition coil 1. Applied to plug P3. In this way, each time the rotor head electrodes 130, 160 and the movable electrode 190 rotate, the power distribution section (odd) 100 and the power distribution section (pus) 110 are operated alternately, and each spark plug is connected to P,
The lights are ignited in the order of 1P81P41P31P6-P51P71P2.

Next, an application example of the present invention will be described.

The above two embodiments have been described for an engine with an even number of cylinders. That is, the case where the number of cylinders is a multiple of two has been described. In this case, the power distribution section was divided into two, with a power distribution section (odd) that distributes power to the odd-numbered spark plugs in the ignition order, and a power distribution section (corner) that distributes power to the even-numbered spark plugs. Applying technical ideas, it is also possible to divide the power distribution section into three parts in an engine having a multiple of three cylinders (6 cylinders, 9 cylinders, 12 cylinders). For example, in the case of 12 cylinders, there is a power distribution section that distributes power to the 1st, 4th, 7th, and 1st spark plugs, and a power distribution section that distributes power to the 2nd, 5th, 8th, and 11th spark plugs.
The power distribution section that distributes power to the 3rd, 6th, 9th, 1st
A power distribution section for distributing power may be provided as a second cost. Dividing the power distribution section into three in this way allows for a larger distance between the discharge electrodes than in the case of two divisions shown in the previous example, which is effective when the number of cylinders is large. [Effects of the Invention] As described above, the distributor of the present invention improves the secondary type electronically controlled distributor that has dust that causes incorrect power distribution, and divides the spark discharge type rotary switch portion into two to prevent errors. Discharge electrodes at related positions that generate power distribution (discharge electrodes that are adjacent to each other) are separated, and odd-numbered discharge electrode groups and even-numbered discharge electrode groups are each constructed by one spark discharge type rotary switch. (odd), (corner)
Another spark discharge type rotary switch driven by the crankshaft is housed and arranged in the power distribution section of , and thereby distributes the secondary voltage (high spark voltage) to the power distribution sections of (odd) and (mono). With this configuration, even if the electronic control circuit performs automatic advance operation, there is no chance of spark discharge to the adjacent (i.e., preceding in terms of firing order) discharge electrode in the spark discharge type rotary switch section. In the case of a follower-type electronically controlled distribution system which does not have a mechanical advance device, it is possible to reliably prevent power distribution errors caused by electronically controlled advance angles.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of a conventional distributor for a six-cylinder internal combustion engine, Figures 2 and 3 are circuit diagrams specifically showing the on/off switch shown in Figure 1, and Figure 2 is a circuit diagram of a conventional distributor for a six-cylinder internal combustion engine. , FIG. 3 is a circuit diagram using a non-contact switch. FIG. 4 is a diagram showing the misalignment of the opposing positions of the rotor head electrode and the discharge electrode when the ignition timing is changed by the electronic control device, and FIGS. 6 and 7 show an embodiment of the distributor of the present invention. , Fig. 5 is a circuit diagram of a distributor for a six-cylinder internal combustion engine, Fig. 6 is a circuit diagram showing its operating state, Fig. 7 is a sectional view showing a specific structure installed in the engine section, Figs. FIG. 9 shows another embodiment of the distributor of the present invention, FIG. 8 is a circuit diagram of a distributor for an eight-cylinder internal combustion engine, and FIG. 9 is a circuit diagram showing its operating state. P, ~P6...Spark plug, 1
...Ignition coil, 10...Power distribution section (odd), 11...Power distribution section (monk), 17...
Switching means, 12, 15, 18...Fixed electrode, 13,
16...Rotor head electrodes, 14a to 14f,
20a, 20b...discharge electrode, 19...movable electrode, 19a-19c...electrode head, 21-
25...High voltage wire, C...Cap, S...
... Rotating shaft, 30-31 ... Electrode mounting assembly, P, ~ P8 ... Spark plug, 1
00...Power distribution section (odd), 110...Power distribution section (monk), 170...Switching means, 120,1
50,180...Fixed electrode, 130,160.
．． ．． ．． ．．・Rotor head electrode, 140a to 140h, 2
00a, 200b...discharge electrode, 190...
...Movable electrode, 190a to 190d... Electrode head. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 7

Claims (1)

[Claims] 1. In a distributor for a multi-cylinder internal combustion engine, which is equipped with a power distribution section for sequentially distributing the secondary voltage generated in the ignition coil of an ignition device equipped with an electronic control switch to a plurality of spark plugs, the power distribution section is (i) A power distribution unit (distributor) for distributing secondary voltage to spark plugs installed in odd-numbered cylinders with respect to the ignition order, and (ii) a power distribution unit (distribution unit) for distributing secondary voltage to spark plugs installed in even-numbered cylinders with respect to the ignition order. The secondary voltage generated in the ignition coil is divided into two distribution sections (odd) and (even) for distributing the secondary voltage.
A switching means for distributing the secondary voltage alternately is provided, and the switching means for distributing the secondary voltage is a spark discharge type rotary switch driven by the crankshaft and rotated in synchronization with the crankshaft. Distributor for multi-cylinder internal combustion engines.