JPS58165577A - Noise preventive instrument for ignition plug - Google Patents

Abstract

PURPOSE:To reduce the number of parts and assembly work steps by making the captioned instrument as a united rigid body of electric composition consisting of a connector metal fitting, resistor, terminal parts provided with a connected high pressure cord and the like and putting a cover made of an elastic insulator on said rigid body. CONSTITUTION:A connector metal fitting 1' is formed with blanking material consisting of a resistor connecting piece 7 and a fitting part 8 to a plug terminal. Two open holes are drilled in the fitting part 8 and projections 10 of a C- shaped clamp 9 are fitted in said holes when the connection metal fitting 1' is fitted to the plug terminal. Further, a terminal metal fitting 14 is formed with a blanking material consisting of a resistor connector piece 7'' and a connection terminal 13 of a high pressure cord provided with sawtooth-like edge parts 12 on its both wings. After clamping both end parts of a resistor 2 by means of connection pieces 7, 7'' of the terminal metal fitting 14 and further additionally tightening an exterior covering of the high pressure cord 15 by means of the connection terminal 13. The space between the fitting part 8 and the connection terminal 13 is filled with thermosetting resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resistance-containing tag cap type noise suppressor used in internal combustion engines, particularly general-purpose φ-type ennons.

An example of a conventional well-known Class O noise suppressor has a structure as shown in the longitudinal cross-sectional view of FIG. It consists of a structure consisting of a continuous non-screw terminal 3 and connection fittings for connecting these to each other, and a hard resin cover 4 that houses and encloses this structure. A waterproof character made of elastic and insulating material inserted into each open end of the oil cover! It is.

・The conventional noise suppressors used in small engines such as motorcycles, outboard motors, and snowmobiles are not equipped with high pressure because there are many chances for moisture to adhere to them when driving in rain or when washing the car. Water intrusion from the cord connection part and the fitting part with the spark plug may impede ignition performance, so a waterproof cap is attached to the mouth end of the resin cover 4C) 94 in addition to the main body to prevent water ingress. 5 and 6, and also requires connecting fittings to connect the connector fitting 1, resistor 2, screw terminal 3 for connecting the high voltage cord conductor, etc., which reduces the number of parts and assembly man-hours. However, due to its structure, it is difficult to obtain gripping strength at the connection part with the high-voltage cord, and vibrations and shocks caused by the vehicle may cause the high-voltage cord to break away from the terminal. The drawback was that they could sometimes leave.

The present invention has a rigid structure in which an electrical component consisting of a connector fitting, a resistor, a terminal portion connected to a high voltage cord, etc. is integrated; , -shi, envelope 1, part.

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By simplifying the number and assembly man-hours and creating a strong structure,
1.1 The object of the present invention is to provide a noise suppressor for a spark plug that improves the drawbacks of the conventional example.

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. Fig. 2 shows an example of a connector metal used in the noise suppressor of the present invention, and Fig. Developed plan views of the blanking material, b and - show the O-shape after forming.

The blanking material has an inverted T-shaped planar shape (for example, a conductive metal plate material such as stainless steel), and serves as the narrow part that becomes the connection piece 7 with the resistor and the fitting part 8 with the plug terminal. The connector fitting 1' is formed by a wide part (by press working or the like). Moreover, two openings 11 are provided in the fitting part 8 with the plug terminal, so that the connector metal fitting l can be inserted! C made of the same material as the connector fitting which has protrusions 10 inward at positions near both ends when fitted to the jig terminal.
Shaped lamp SK] The protrusion 10 is inserted into the opening 11 to hold the plug 1♀, and the hole 3
i1 side - □□, 8゜work. □□□”1 It has both effects.

9. The same drawing shows another embodiment in which the planar shape of the blanking material is shaped (the developed plan view is not shown) for the connecting piece with the resistor, and the connecting piece with the resistor 7 ' is formed so that the connection fitting at the end of the resistor can be crimped from both sides.

Figure 3 shows the connection terminal fitting for the high-voltage cord in the noise suppressor of the present invention, Figure 1 is a developed plan view of the blanking material before forming, and b shows the blank after forming. 4. The blanking material has a planar shape and is made of the same material as the circular connector metal fittings described above.The connecting piece 7'1 with the resistor, the outer sheath of the high voltage cord on both wings, and the sheath are crimped and gripped. A multi-terminal metal fitting 14 is formed by press working or the like from a portion of a high-voltage cord that is provided with a serrated end 12 for holding the cord and is to become a continuous terminal 13.

FIG. 4 is a perspective view showing the connection state of the connector fitting, resistor, and high voltage cord shown in FIGS. 2 and 3;
A connecting piece 7 provided at one end of each extension end of the terminal fitting 14
and 7', tighten and hold the connecting fittings at both ends of the resistor 2, and connect the outer sheath of the high voltage cord 15 to the terminal 1.
3. The connection is made by crimping and crimping.

The conductor 16 of the high-voltage cord is folded on the outside of the high-voltage cord or inserted between the terminal fitting 14 with a U-shaped metal pin (not shown) inserted and swaged. 90 to 18 ON, depending on the intersection angle between the axes of the high voltage cord O terminal fitting and connector fitting, and the placement of the spark plug or power distributor in the engine groove. Klp is selected as appropriate.

Furthermore, the resistor portion including the connection portion of the electrical component includes:
The fitting part 8 of the connector fitting and the connection terminal 13 of the high voltage cord.
At the end of each metal fitting Km! A thermosetting resin such as phenol resin or phenolic resin is filled, and the bottom cover is solidified so that the outer diameter of the high-voltage cord connection end is approximately equal to the outer diameter of the high-voltage cord.

Fig. f1115 is a perspective view showing the shape of the electrically conductive structure 18 to which a high-voltage cord formed by filling resin and assimilating it by stratification is connected. .

Fig. 6 is a vertical sectional view showing a cover 17 used in the noise suppressor of the present invention, which is formed so as to tightly cover the electrical component 18, and is made of elastic material such as ethylene p-Birenco. (insulating material), openings 19 on the high voltage cord connection terminal side and the ignition plate fitting side, respectively.
20 is provided, and the angle O between the respective axes of both openings is
' is formed to coincide with the angle 0 formed by the respective axes of the terminal fitting and connector fitting of the high voltage cord of the electrical component shown in No. 411.

FIG. 7 shows the electrical structure 1 shown in FIGS. 4 and 5.
8 is a vertical cross-sectional view showing the shape shown in FIG. 6 in which the elastic insulating cover 17 is inserted and permanently covered. In addition, Fig. 4, Fig. 5,
Identical parts in FIGS. 6 and 7 are designated by the same reference numerals.

The resistor used in the noise suppressor according to the present invention includes:
Usually, a ceramic resistance element is used, but if a high impedance 41) wire with a substitute ferrite core is used in addition to this, it becomes even more i...? Further, a high voltage cord and a well-known wire-wound resistance wire for noise prevention may be used in combination.

Figure 8 is a graph showing the results of nine measurement tests conducted to compare the noise prevention effects of the noise preventer of the present invention and the conventional resistor-containing cap. 1 shows the frequency characteristic of the noise current for the conventional resistor-containing cap, and the solid line I shows the frequency characteristic of the noise current for the noise preventer of the present invention.

Each sample is a metal integral piece assuming an engine fin with the same height h and interval W as shown in FIG.
and nine ignited Buddhas placed in the center between B-0 21, 2
1', and the noise current often generated by spark discharge was reduced to 11J. In the figure, 1 is a noise preventer of the present invention, and b is a sample in which a high voltage cord is connected to a conventional resistor.

From the graph in FIG. 8 and the vertical cross-sectional view of the sample shown in FIG. When the resistor is located close to the spark gear on the ignition graph, the noise current reduction rate is excellent, and the preventer (resistor) itself is located at a low position relative to the height of the fin. It will be understood that the shielding effect of the fins against the radiated noise radio waves acts synergistically and has the advantage of increasing the noise prevention effect.

As is clear from the above description, the present invention does not particularly require a connecting fitting for connecting the connecting terminal of a high-voltage cord, a connector fitting, and a resistor;
Since the elastic insulating cover is inserted into the electrical structure including the connecting portion and the high voltage cord connecting terminal, etc., and is formed as an integrated rigid structure, the cover of the elastic insulator is inserted and enclosed, which is different from the conventional example. It is possible to provide a noise suppressor for ignition gloves that eliminates the need to provide a waterproof cover at the open end of the cover, has a small number of parts, is easy to assemble, has a strong connection to the high voltage cord, and has excellent noise prevention effects. It is something.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional resistor-containing cap.
No. 29 is a developed plan view of an example of the connector metal fitting used in the noise suppressor of the present invention, Fig. 29 and C are perspective views after molding, and No. 31i! 1a is a developed plan view of the high-voltage cord connection terminal fitting used in the noise suppressor of the present invention, the same figure is a perspective view after molding, and Figure 4 shows the connector fitting, resistor, and high-voltage cord terminal fitting. Fig. 5 is a perspective view of the electrical structure formed by connecting the electrical structure, Fig. 5 is a perspective view showing the electrical structure formed by filling the resistor part including the Fi connection part with resin, molding and solidifying it, and integrating it; Fig. 6 shows the elastic Figure 7 is a longitudinal cross-sectional view of the insulator force/threat.
No. 811 is a vertical cross-sectional view showing the noise suppressor of the present invention in which an elastic insulating cover is fitted and wrapped around the electrical component shown in FIG.
1 is a frequency characteristic graph of noise currents for noise preventers according to the present invention and a conventional example, and FIG. 99 is a vertical cross-sectional view of a sample subjected to a perturbation experiment and an explanatory diagram of its arrangement. l, r... Connector fitting, 2... Resistor, 4...
Resin paddle - 15, 6... Waterproof cap, 7, 7'
, 7'... Connection piece, 8... Fitting portion, 9--C-shaped runzo, 10... Protrusion, 11... Opening, 13...
・Screw terminal, 14...Terminal fitting, 15...High voltage cord, 16...Conductor, 17...Elastic insulator cover, 1
8... Electrical component after resin molding, 19.20...
Aperture. Patent applicant: Nippon Spark Plug Co., Ltd. 1 Poka I, i
B Dynasty Yangjin Patent Attorney Mamoru Takeuchi Figure 1: ・ □ Figure 2 Figure 3

Claims (1)

[Claims] 1. Ignition! The ignition is created by inserting a noise prevention resistor between the lug and the high voltage cord! In the lug noise suppressor, one end of each of the connector fitting member made of a conductive metal plate that fits with the grab terminal and the terminal fitting member that connects the outer covering of the high voltage cord by crimping is formed by extending one end of the connector fitting member. The resistor is inserted and connected between the high-voltage cord and the connector fittings by crimping and gripping the connecting fittings at both ends of the resistor with the connecting pieces.Insulating resin is applied to the resistor part that provides the connecting part. It is filled, molded and solidified, and formed into a rigid structure including terminal fittings and connector fittings connected to high-voltage cords, and an elastic insulating force/blue which is formed so as to be able to touch them internally and fit them together. Ignition that comes with packaging! Noise suppressor for rugs. 2. The ignition according to claim 1, in which the resistor is made of a ceramic resistance element! Noise suppressor for rugs. 3. A noise suppressor for a spark plug according to claim 1, wherein the resistor is a high impedance wire-wound resistance element.