JPH04203359A - Distributor for internal combustion engine ignition - Google Patents

Abstract

PURPOSE:To prevent the discharge voltage rise even in a long-time use and maintain good reduction effect of noise waves by forming at least one tip discharging part of either of a rotary terminal and a fixed terminal by a metal piece provided with a plurality of cuts where the melting point of the metal is the specified temperature, and bringing a dielectric part into close contact with the lower surface of the metal piece. CONSTITUTION:At least one tip discharging part 8 of either of a rotary terminal and the fixed terminal is formed with a metal piece 1 provided with a plurality of cuts 4 where the melting point of the metal is below 1083 deg.C, and at the same time, there is formed a laminated structure where a dielectric part 3 is brought into close contact with the lower surface of the metal piece 1. The tip discharging part of the metal terminal 1 is fused by the discharge heat to form a tip molten part 7, resulting in connection with the dielectric part 3. As this action is achieved for the respective discharging, the molten metal in the tip molten part 7 flows into the gaps even if the gaps are produced in some parts of the metal terminal 1 and the dielectric part 3 due to thermal deformation, fusing losses or the like, suppressing production of gaps. The discharging is generated at convex parts 5 of the tip discharging part 8 where the electrical field is highly concentrated and the tip molten part is limited to the convex parts 5, and the molten metal flows into cut spaces 6 beside the convex parts 5, suppressing generation of convex parts.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a power distribution device for internal combustion engine ignition, and particularly to a power distribution device for internal combustion engine ignition that aims to reduce noise radio waves generated between a rotating electrode and a fixed electrode during power distribution. Regarding power distributors.

[Conventional technology]

BACKGROUND ART Among ignition devices installed in internal combustion engines such as automobiles, noise radio waves generated when a spark plug and a power distributor discharge have a wide frequency band, and therefore may cause radio wave interference to various wireless communications. Therefore, these ignition devices are equipped with various measures to suppress the generation of noise radio waves.

As a means for suppressing noise radio waves from a spark plug, a method of using a resistor-containing spark plug together with a resistor-containing high-voltage wire has been put into practical use, and its effectiveness has been recognized.

Furthermore, as a means for suppressing noise radio waves from a power distribution device, it has been proposed to add a dielectric material to the discharging portion at the tip of a metal electrode in the power distribution device, and to reduce the discharge pressure by the action of this dielectric material. That is, JP-A No. 59-226278 discloses applying silicone varnish to metal electrodes, and JP-A No. 61-76764 discloses applying a dielectric material to metal electrodes using a wire mesh. Japanese Patent Application No. 13672/1983 discloses bonding a dielectric material to a metal electrode using an adhesive.

[Problem to be solved by the invention]

However, among conventional technologies, those coated with silicone varnish have the disadvantage that when used for a long period of time, the silicone varnish deteriorates due to the heat generated by discharge, which increases the discharge pressure and reduces the effectiveness of reducing noise radio waves. There is.

In addition, when using wire mesh or adhesives for a long period of time, the dielectric material will peel off due to the heat generated by the discharge, and as with silicone varnish, the discharge pressure will increase and the effectiveness of reducing radio noise will decrease. .

An object of the present invention is to provide an internal combustion engine ignition power distribution device that can maintain a good noise radio wave reduction effect without increasing the discharge pressure even after long-term use.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a rotating electrode that rotates in conjunction with the rotation of an internal combustion engine, and a fixed electrode that is disposed opposite to the tip of the rotating electrode, generating an electric discharge between the rotating electrode and the fixed electrode when the rotating electrode rotates;
In an internal combustion engine ignition power distribution device that distributes high voltage to a spark plug, at least one of the rotating electrode and the fixed electrode has at least the tip discharge portion formed of a metal having a melting point of 1083° C. or lower and having a plurality of notches. It has a laminated structure in which a dielectric is closely attached to the lower surface of the metal. Further, the present invention includes a rotating electrode that rotates in conjunction with the rotation of an internal combustion engine, and a fixed electrode that is disposed opposite to the tip of the rotating electrode, and when the rotating electrode rotates, the tip of the rotating electrode and the fixed electrode are connected to each other. causing a discharge between
In an internal combustion engine ignition power distributor that distributes high voltage to a spark plug, at least a tip discharge portion of an electrode whose potential becomes negative during power distribution among the rotating electrode and the fixed electrode,
It is made of a metal with a melting point of 1083° C. or lower and has a plurality of notches, and has a laminated structure in which a dielectric material is adhered to the lower surface of the metal.

Further, the rotating electrode or the fixed electrode of the present invention has a cutting interval of 0.5 to 2IIIm and a cutting depth of 0.5 to 2IIIm in the tip discharge part.
A dielectric material made of a resin made by impregnating glass fiber with silicone resin is adhered to a metal made of copper, copper alloy, silver, or silver alloy, which has continuous notches within the range of two combs. be.

Further, the present invention uses a pressing method to cut the tip discharge part of any metal among copper, copper alloy, silver, and silver alloy.

The reason is that it is formed by a roll forming method, an electric discharge machining method, and an etching method.

[Operation] FIG. 6 is a sectional view of the main part showing the power distribution part of the internal combustion engine ignition power distributor. In the figure, the power distributor is attached to the internal combustion engine by a housing 13 and a camshaft 19. camshaft 19
is designed to rotate in conjunction with the rotation of the internal combustion engine, and a distribution element 21 having a rotating electrode 20 attached on an insulator surface is fixed to the upper part thereof. Further, a fixed electrode 15 is provided opposite to the distal end discharge section 23 of the rotating electrode 20, and a plurality of fixed electrodes 15 are arranged along the outside of the rotation locus of the distal end discharge section 23. Center of rotation of rotating electrode 2o
A central terminal 16 is provided on one side, and this central terminal 16 is connected to a rotating electrode 20 via a spring 18 and a carbon contact 17. The fixed electrode 15 and the central terminal 16 are housed within the power distribution gap 14, and the power distribution cap 14 is attached to the housing 13.

In the power distributor having such a configuration, when the rotating electrode 2° comes to a position facing the fixed electrode 15, the high voltage generated by the operation of the primary current interrupter of the ignition coil is transferred to the central terminal 16.
Rotating electrode 2 via spring 18 and carbon contact 17
The electric current is transmitted to the fixed electrode 15 by dielectric breakdown of the air in the minute gap 22 between the tip discharge part 23 of the rotating electrode 20 and the fixed electrode 15, and then is supplied to the ignition plug.

At this time, the discharge generated between the rotating electrode 20 and the fixed electrode 15 causes the generation of noise radio waves.

It is known that the cause of the generation of noise waves is a state in which a large current flows in an impulse manner between the floating capacitance existing between the rotating pole 20 and the fixed electrode 15 at the beginning of discharge, that is, a capacitive discharge flow. It is being In order to reduce noise radio waves, it is possible to reduce the capacitance discharge current, but since the capacitance has a limit value determined by the shape of the power distributor, it is impossible to reduce it significantly, and instead it is necessary to lower the discharge current. That is appropriate.

It is known that the discharge starting voltage can be significantly lowered by adding a dielectric to the rotating electrode or fixed electrode. In fact, as shown in FIG. 2, a rotating electrode with low discharge voltage characteristics is used, in which a silicone dielectric 10 is closely adhered to a stainless steel plate 9.

However, when such a rotating electrode is used for a long period of time, the discharge pressure increases as the starting distance increases, as shown in FIG. The reason for this is that the tip discharge part 8 of the electrode is heated by the discharge arc heat over a long period of time, causing thermal deformation and melting damage to the stainless steel plate 9 and silicone resin plate 10, as shown in FIG.
And as shown in FIG.
1 occurs, or there is a protrusion 1 on the tip of the stainless steel plate.
2 occurs, and the discharge pressure reduction effect due to the dielectric addition effect is reduced. Therefore, in order to prevent the discharge pressure from increasing by 1, it is sufficient to prevent the gap 11 and the protrusion 12 from occurring.

As shown in FIG. 1, the features of the present invention are that a metal is used for the electrode such that the tip discharge portion 8 of the electrode slightly melts due to electric discharge, a dielectric material 3 is disposed on the lower surface of the metal electrode, and furthermore, the tip discharge portion 8 of the metal This is because a plurality of notches 4 are provided in the portion 8.

In this way, the distal end portion 8 of the metal electrode 1 is melted by the discharge heat to form a distal end melted portion 7, which comes into contact with the dielectric 3 placed on the lower surface of the metal electrode 1. This action is performed every time a discharge occurs, so even if gaps are formed in the metal electrode 1 and part of the dielectric 3 due to thermal deformation, melting damage, etc., the molten metal in the tip molten part 7 will flow into these gaps. The generation of gaps can be suppressed. Note that the above-mentioned action utilizes the melting point of the metal electrode 1, and occurs regardless of the presence or absence of the notch 4 provided in the distal end discharge portion 8 of the electrode.

A further feature of the present invention is the notch 4 provided in the tip discharge part 8 of the electrode. By providing the notch, discharge occurs mainly at the convex part 5 of the tip discharge part 8 where electric field concentration is large, and the tip melting part 8 The molten metal is limited to the convex portion 5 and flows into the cut space 6 beside the convex portion 5 in this state. Since this action is also performed every time a discharge occurs, even if protrusions occur due to melting damage, etc., they are remelted and flow into the cut space 6, so that the occurrence of protrusions can be suppressed.

From the above, when the electrode of the present invention is used, the occurrence of gaps and protrusions that cause an increase in the discharge pressure over a long period of time becomes extremely small, and the discharge pressure can be maintained at a low state.

Further, it is more effective to provide the electrode on the negative electrode side of the power distributor.

[Examples] Examples of the present invention will be described below, but the present invention is not limited to these Examples.

<Example 1> Figure 7 shows an example of a rotating electrode of a power distributor according to the present invention, in which a triangular cut 2 with a depth of 1 m at an angle of 45 degrees is made on the surface of the tip discharge part.
A silicone resin-impregnated glass fiber cloth 24 with a thickness of 0.5 mm is placed on the entire lower surface of the copper plate 23 with a thickness of 0 and 6 mm.
This is a laminated electrode. Figure 8 shows the discharge pressure when a 200 mm running test was conducted using the electrode of the present invention;
These are the results of measuring the size of gaps and protrusions generated in the electrode tip discharge portion 8. According to this, the discharge voltage of the product of the present invention is 4.0 to 4.5 kV, the gap is O to 0, 04 mm,
The convexity has no benefit and even if the running distance increases, the discharge pressure is 9 gaps, the increase in the convexity is extremely small, and it has a good noise radio wave reduction effect even during long-term use. In addition to this embodiment, the triangular cut 25 may have a depth of 0.5 to 2 mm and an angle of 15 to 90 degrees, and the same effect as in this embodiment can be obtained. Copper alloys such as copper, bronze, phosphor bronze, and aluminum bronze, or pure silver, silver-copper alloys, silver-copper-zinc alloys, etc., have a triangular shape with a depth of 0.5 to 2 spindles and an angle of 15 to 90 degrees. Even when a cut is made, the same effect as in this embodiment can be obtained.

<Example 2> Fig. 9 shows another example of the invention of the rotating electrode of the power distributor according to the present invention, in which a semicircular cut 26 with a radius of 0.5 mm is provided on the entire surface of the tip discharge part 8 and the thickness is 0.6 mpa. The electrode is made by laminating a silicone resin-impregnated glass fiber cloth 24 with a thickness of 0.5 stroke on the lower surface of a copper plate 23. FIG. 10 shows the results of measuring the discharge pressure and the size of the gap and protrusion generated at the electrode tip 8 when a 200 mm running test was conducted using the electrode of the present invention.

According to this, the discharge pressure of the product of the present invention is 4.0 to 4.4k.
V, the gap is o~0.0511Im, the convexity is On++n, and even if the running distance increases, the increase in the discharge pressure 2 gap and the convexity is extremely small, and it has a good noise radio wave reduction effect even in long-term use. In addition, apart from this embodiment, there is a notch 26 in the antemortem shape.
The same effect as in this example is obtained even in the radius range of 0.25 to 1+ nm, and copper alloys such as brass, red bronze, bronze, phosphor bronze, aluminum bronze, pure silver, silver-copper alloy, etc. can be used instead of copper. , radius 0.25 mm to I for silver-copper-zinc alloy, etc.
Even if a semicircular cut 26 is made in the range n++n,
There are effects similar to those of this embodiment.

<Embodiment 3> FIG. 11 shows another example of the invention of the rotating electrode for a power distributor according to the present invention, in which a triangular cut with a depth of 1 mm is provided on the entire surface of the tip discharge surface 8 at an angle of 45 degrees. This electrode is made by laminating an alumina molded body 27 with a thickness of 0.5 strands on the entire lower surface of a copper plate 23 with a thickness of .6m+n. Figure 12 shows a 200M electrode using the electrode of the present invention.
These are the results of measuring the discharge pressure and the size of the gap and protrusion generated in the electrode tip discharge portion 8 when performing the m running test.

According to this, the discharge pressure of the product of the present invention is 4.0 to 4.4k.
V, the gap is 0 to 0.04+nm, the protrusion is O+nm, and even if the running distance increases, the increase in the discharge pressure 2 gap and the protrusion is extremely small, and it has a good noise radio wave reduction effect even in long-term use. Note that, apart from this example, the same effect as this example can be obtained even when a molded body of magnesia, silica, titania, etc. is used as the dielectric material.

[Effects of the Invention] According to the present invention, gaps and protrusions that reduce the dielectric addition effect can be kept extremely small, so it is possible to effectively reduce noise radio waves generated from a power distributor over a long period of time. Furthermore, since the electrodes are made of inexpensive materials, the power distributor can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an electrode according to an embodiment of the present invention, Fig. 2 is a perspective view of a conventional electrode, and Fig. 3 shows the distance traveled and the discharge pressure when using the electrode shown in Fig. 2. Graph showing relationships, 4th
The figure is a cross-sectional view of the electrode in Figure 2 after use, and Figure 5 is a cross-sectional view of the electrode in Figure 2.
A graph showing the relationship between travel distance, discharge pressure, gaps and protrusions generated in the electrode when using the electrode shown in the figure, Figure 6 is a sectional view of the main part showing the power distribution part of the power distributor, and Figure 7 is the main part of the main part. FIG. 8 is a perspective view of an electrode according to an embodiment of the invention; FIG. 8 is a graph showing the relationship between travel distance, discharge pressure, gaps generated in the electrode, and protrusions when the electrode shown in FIG. 7 is used; FIG. 9 10 is a perspective view of an electrode according to another embodiment of the present invention, and FIG. 10 is a graph showing the relationship between travel distance, discharge pressure, gaps generated in the electrode, and protrusions when the electrode of FIG. 9 is used. Fig. 11 is a perspective view of an electrode according to another embodiment of the present invention, and Fig. 12 shows the relationship between travel distance, discharge pressure, gaps generated in the electrode, and protrusions when the electrode shown in Fig. 11 is used. This is a graph showing.

Claims (1)

[Claims] 1. A rotating electrode that rotates in conjunction with the rotation of an internal combustion engine, and a fixed electrode that is disposed opposite to each other with a gap at the tip of the rotating electrode, and when the rotating electrode rotates, the rotating electrode In an internal combustion engine ignition power distributor that distributes high voltage to a spark plug by causing discharge between a tip of the rotating electrode and the fixed electrode, at least a tip discharge of at least one of the rotating electrode and the fixed electrode is provided. A power distribution device for an internal combustion engine, characterized in that the part is formed of a metal having a melting point of 1083° C. or lower and has a plurality of notches, and has a laminated structure in which a dielectric material is closely adhered to the lower surface of the metal. 2. In claim 1, among the rotating electrode and the fixed electrode, at least the distal end discharge portion of the electrode whose potential is on the negative side during power distribution is provided with a plurality of cut portions, with a melting point of 1083 ° C.
A power distribution device for ignition of an internal combustion engine, which is made of the following metal and has a laminated structure in which a dielectric material is adhered to the lower surface of the metal. 3. The power distributor for internal combustion engine ignition according to claim 1, wherein the metal constituting the distal end discharge portion of the electrode is copper, a copper alloy, silver, or a silver alloy. 4. In claim 1, the interval between the plurality of notches provided in the metal constituting the tip discharge portion of the electrode is 0.5 to 0.5.
The depth of the cut portion is 0.5 to 2 mm within the range of 2 mm.
Distributor for internal combustion engine ignition within the range of 5. The power distribution device for internal combustion engine ignition according to claim 1, wherein the dielectric is formed of a resin obtained by impregnating glass fiber with silicone resin, or a molded body of alumina, silica, magnesia, titania, or the like. 6. A rotating electrode or a fixed electrode, in which the plurality of cuts provided in the distal end discharge portion of the electrode according to claim 1 are formed by a pressing method, a roll forming method, an electrical discharge machining method, an etching method, or the like. 7. A power distribution device for ignition of an internal combustion engine, using the power distribution device according to claim 1 as a power distribution device for reducing noise radio waves generated during power distribution operation of the power distribution device.