JPH0640505B2 - High-voltage cable device manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a novel method for producing a high-voltage cable device used in an ignition device for an automobile engine or the like.

[Conventional technology]

Ignition systems for automobile engines, etc. are designed to generate a spark by applying a high voltage to the spark plug, but in order to prevent smoldering during ignition and control the ignition timing accurately, it is connected in series with the spark plug. A so-called series-gap ignition device having a discharge gap is proposed.

An example of such a series gap ignition device is disclosed in Japanese Utility Model Laid-Open No. 63-101486. This is constructed as shown in FIG. 2, where A is, for example, a spark plug screwed to a cylinder head B, on the other hand, a connection terminal 2 engageable with a terminal 1 of the spark plug A and a high voltage cable. A high-voltage cable device C including a plug cap 6 in which a cable terminal 4 coupled to an end of the cable 3 and a cylindrical casing 5 are arranged to face each other with a gap,
The spark plug A can be detachably fitted. A discharge tube 1 having a series gap S formed by sealing a pair of discharge electrodes 7 and 8 with a glass tube 9 between the connection terminal 2 in the plug cap 6 and the cable terminal 4.
0 is installed.

[Problems to be Solved by the Invention]

In the discharge tube used in such an ignition device with a series gap, the discharge starting voltage needs to be higher than the spark plug to some extent in order to accurately control the ignition timing. However, when a discharge tube having a high discharge start voltage is used, so-called creeping discharge is likely to occur along the outer surface of the discharge tube prior to the start of discharge in the series gap. Therefore, it is extremely difficult to miniaturize the discharge tube itself and increase the discharge starting voltage, and it is also difficult to miniaturize the plug cap of the high-voltage cable device.

Therefore, the present invention is intended to provide a highly reliable high-voltage cable device with a series gap that does not cause abnormal discharge of the discharge tube.

[Means for Solving the Problems]

An object of the present invention as described above is to provide a connection terminal that is engageable with a terminal of an ignition plug and has a through hole provided with a check valve mechanism that allows only passage of fluid from the front side to the rear side. An additional functional component such as a series gap forming discharge tube is incorporated in an electrically insulating tubular casing fitted and fixed inside the tip, and connected to the rear end of the connection terminal, and the power supply side of the additional functional component is further connected. Hold the assembly in a vertical position so that the head cap is at the upper side of an assembly that is formed by connecting a high-voltage cable to the terminal part and installing a head cap having an exhaust hole at the rear end of the tubular casing. As it is, the liquid electrically insulating thermosetting resin material is injected from the through hole until at least the space formed between the additional functional component and the tubular casing is filled, and then the resin material is solidified. Featuring It can be achieved by preparation of high-voltage cable system that.

The connection terminal engageable with the terminal of the spark plug used in the present invention is provided with a through hole provided with a check valve mechanism. In this check valve mechanism, fluid is close to the front of the terminal, that is, the spark plug. It is configured so that it can be distributed only from one side, and may be one using, for example, a rubber flap.

Further, as the additional functional component such as the discharge tube in the present invention, it is possible to use one in which an electrically insulating resin spacer for maintaining a distance between the outer surface and the inner surface of the tubular casing is provided on at least the outer surface thereof. However, the electrically insulating resin spacer at this time can also be formed by a method such as insert molding an additional functional component such as a discharge tube using a resin mold.

The head cap used in the present invention is provided with an exhaust hole at a position where the air remaining in the cylindrical casing can be discharged.

As the liquid electrically insulating thermosetting resin material that fills the space formed between the connection terminal and the additional function component and the tubular casing, for example, epoxy resin, silicone resin, polyester resin, etc. may be used. Yes, but not limited to.

[Work]

The high-voltage cable device manufactured by the method of the present invention,
All the high-voltage current supplied from the end of the high-voltage cable flows through the inside of the additional functional component such as the discharge tube to the connection terminal to the spark plug, and creeping discharge does not occur.

〔Example〕

Hereinafter, a method for manufacturing the high voltage cable device of the present invention will be described with reference to the drawings. It should be noted that the members having the same functions as those in the prior art are denoted by the same reference numerals.

FIG. 1 shows a high-voltage cable device C in which a connection terminal 2 for a spark plug is provided in the tip portion of a tubular casing 5 and a high-voltage cable 3 is connected. A female terminal 2'for fitting the discharge electrode terminal 7'of the discharge tube 10 is formed, and a check valve 2 "is provided so as to partition the space penetrating the inside of the connection terminal 2 back and forth at the middle. It is attached.

Further, a resistor 12 is connected to the other discharge electrode terminal 8'of the discharge tube 10 through intermediate female terminals 11 on both ends, and the rear end of the resistor 12 is connected to the end of the high voltage cable 3. The cable terminal 4 is fitted and connected. Then, the space formed between the connection terminal 2, the discharge tube 10, the intermediate connection terminal 11, the resistor 12, and the like and the inner surface of the casing 5 is filled with the electrically insulating epoxy resin 14 by casting to crosslink and cure. By doing so, these additional functional parts are embedded and fixed.

To manufacture such a high-voltage cable device C, first,
The discharge tube 10 is inserted into a casing 5 having a connection terminal 2 for a spark plug in the tip portion thereof, and the discharge electrode terminal 7'is fitted to the female terminal 2'at the rear end of the connection terminal 2, and the discharge tube 10 is further connected. The discharge electrode terminal 8 ′ at the rear of the is fitted with a female-type intermediate connecting terminal 11 and a resistor 12 at both ends,
After making the discharge tube 10 and the resistor 12 coaxial with the casing 5, the cable terminal 4 of the high-voltage cable 3 is coupled to the terminal portion at the rear of the resistor 12 and the head cap 13 is attached to the high-voltage cable device. Assemble C.

After that, the assembly of the above-mentioned high-voltage cable device C is held in the vertical position so that the connection terminal 2 is at the bottom and the head cap 13 is at the top, and the check valve 2 ″ of the connection terminal 2 is used for liquid thermosetting synthesis. A resin, for example, an epoxy resin is poured in. The liquid resin fills the inside of the casing 5 from the lower part and gradually fills the space inside the casing 5, but the filling level is such that at least the additional functional parts such as the discharge tube 10 are embedded. However, the space may be filled up to the space inside the head cap 13. The liquid resin thus filled up is solidified under the respective appropriate curing reaction temperature conditions, whereby the high-voltage cable device C is obtained. Is completed.

〔The invention's effect〕

According to the manufacturing method of the high-voltage cable device of the present invention, the additional functional parts assembled inside, especially the creeping discharge around the discharge tube does not occur, not only the accurate ignition timing can be maintained but also the vibration is strong and reliable. Thus, a high-voltage cable device having high property can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an example of a high-voltage cable device obtained by using the method for manufacturing a high-voltage cable device of the present invention, and FIG. 2 is a cross-sectional view of a conventional high-voltage cable device. . A ... Spark plug, B ... Cylinder head, C ... High-voltage cable device, S ... Series gap, 1 ... Plug terminal, 2 ... Connection terminal, 2 '... Female terminal, 2 "... Non-return Valve, 3 ... High-voltage cable, 4 ... Cable terminal, 5 ...
Casing, 6 ... Plug cap, 7,8 ... Discharge electrode, 7 ', 8' ... Discharge electrode terminal, 9 ... Glass tube, 1
0 ... Discharge tube, 11 ... Intermediate connection terminal, 12 ... Resistor, 13 ... Head cap, 13 '... Exhaust hole, 14
...... Electrically insulating resin.

Claims (1)

[Claims] 1. A connection terminal engageable with a terminal of an ignition plug, the connection terminal having a through hole provided with a check valve mechanism for allowing only passage of a fluid from a front side to a rear side thereof is fitted inside a tip. An additional functional component such as a discharge tube for forming a series gap is installed in an electrically insulating tubular casing that is fixedly attached, and connected to the rear end of the connection terminal, and a high-voltage cable is connected to the power supply side terminal of the additional functional component. To the assembly in which a head cap having an exhaust hole is connected to the rear end of the tubular casing and the through hole is held while the assembly is held in the vertical position so that the head cap is located above. Higher pressure characterized by injecting a more liquid electrically insulating thermosetting resin material until at least filling the space formed between the additional functional component and the tubular casing, and then solidifying the resin material. cable Preparation of location.