JPH06338356A - Rubber cap for high voltage wire - Google Patents

Abstract

(57) [Abstract] [Purpose] In the rubber cap of the high-voltage electric wire arranged at the end of the high-voltage electric wire of an automobile or the like, the rubber cap may be fitted to the electric wire connection portion provided on the coil and the distributor. Provided is a rubber cap for a high-voltage electric wire, which can easily judge the quality of a fitted state and has high reliability with respect to waterproofness. [Structure] A tongue portion 2 is provided inside the cap body 1, and when the one end side of the cap body 1 is fitted to the electric wire connecting portion 1, the tongue portion 2 is fitted to the end portion of the electric wire connecting portion 1. To do. When pressed by the tongue portion 2, the other end side of the cap body 1 bulges outward, and the lever is used to generate an inward stress on one end side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is attached to the tip of a high-voltage electric wire used for wiring between a coil, a distributor, an ignition plug, etc. of an automobile, and is provided on the high-voltage electric wire, the coil, the distributor, etc. The present invention relates to a rubber cap for a high-voltage electric wire that ensures waterproofness between the electric wire connection portion.

[0002]

2. Description of the Related Art FIG. 4 is a schematic view showing a high voltage electric wire for connecting between a coil and a distributor and between a distributor and an ignition plug in an automobile. High-voltage electric wires 21 and 22 for automobiles are coils (high-voltage generator) 2
5 and the distributor 26 and between the distributor 26 and a spark plug (not shown). Rubber caps 23 and 24 are attached to the ends of the high-voltage electric wires 21 and 22, and the rubber caps 23 and 24 are attached to the coil 25 and the distributor 26.
The high voltage electric wire 2 is fitted to the electric wire connecting portions 25a and 26a of
The waterproofness between the wires 1 and 22 and the wire connecting portions 25a and 26a is ensured.

The pulsed high voltage generated in the coil 25 due to the rotation of the engine is input to the distributor 26 via the high voltage electric wire 21, and is supplied to each spark plug by the distributor 26 at a predetermined timing.

FIG. 5 is a sectional view showing a rubber cap and an electric wire connecting portion of a conventional high voltage electric wire. The wire connecting portion 25a is
Cylindrical insulator part 27 made of an insulator (plastic)
And a cylindrical receiving terminal 28 arranged along the central axis of the insulator portion 27. This terminal 2
8 has a recess 2 at a position separated from the tip by a predetermined distance.
8a is provided.

On the other hand, the high-voltage electric wire 21 is provided with a conductive plug-in terminal 29 at its end, and the plug-in terminal 29 is fitted into the receiving terminal 28 of the coil or the distributor so that electrical connection can be obtained. It has become. The insertion terminal 29 is provided with a convex portion 29a at a predetermined position from the tip.

The rubber cap 23 is arranged so as to fit into the end of the high voltage electric wire 21. The rubber cap 23 is formed into a substantially conical shape in accordance with the shape of the electric wire connecting portion 25a, and the inner surface thereof is provided with, for example, two seal portions 23a that project inward of the cap and extend in the circumferential direction. The rubber cap 23 is fitted into the electric wire connecting portion 25a when the insertion terminal 29 is fitted into the receiving terminal 28, and the sealing portion 23a.
Adheres to the wall surface of the insulator portion 27. As a result, it is possible to prevent water, oil, dust, and the like from entering the connection portion between the insertion terminal 29 and the receiving terminal 28.

[0007]

However, in the rubber cap of the above-mentioned conventional high voltage electric wire, it is difficult to judge whether the adhesion between the rubber cap and the electric wire connecting portion is good or bad, and the reliability of waterproofness is low. There is a problem that it is not enough. That is, the inner diameter of the rubber cap is set to be smaller than the outer diameter of the electric wire connecting portion in order to ensure the close contact between the rubber cap and the electric wire connecting portion. Therefore, a relatively large force is required when fitting the rubber cap to the wire connecting portion. In this case, whether or not the rubber cap is sufficiently fitted is confirmed by the feeling when the convex portion 29a of the insertion terminal 29 is engaged with the concave portion 28a of the receiving terminal 28. That is, if the rubber cap is pushed into the wire connecting portion until the convex portion 29a of the plug-in terminal 29 engages with the concave portion 28a of the receiving terminal 28, good waterproofness can be obtained. However, the feel of the convex portion 29a when it engages with the concave portion 28a is barely noticeable when the insertion terminal 29 and the receiving terminal 28 are fitted together, so that the convex portion 29a is normally depressed in the concave portion 28a. It is extremely difficult to get a feel when engaging in. If the inner diameter of the rubber cap is increased, it is possible to more surely obtain the feel when the convex portion 29a and the concave portion 28a are fitted, but if this is done, the adhesion between the rubber cap and the wire connecting portion will be reduced, and the waterproof property will be improved. May not be sufficient.

The present invention has been made in view of the above problems, and it is possible to easily judge whether the fitted state of the rubber cap and the electric wire connecting portion is good or not based on the feeling when the rubber cap is fitted to the electric wire connecting portion. It is an object of the present invention to provide a rubber cap for a high-voltage electric wire, which can ensure the waterproof property between the rubber cap and the electric wire connecting portion.

[0009]

A rubber cap for a high-voltage electric wire according to the present invention is arranged so as to be fitted to an end portion of an electric wire and one end side of which can be fitted to an electric wire connecting portion of a member to which the electric wire is to be connected. It is characterized in that it has a cap body and a tongue portion that is disposed inside the cap body and that fits into an end portion of the electric wire connecting portion.

[0010]

According to the present invention, the one end side has the cap main body which can be fitted to the electric wire connecting portion provided on the coil or the distributor, and the tongue provided inside the cap main body. Is adapted to be fitted to the end of the electric wire connecting portion. When the cap body is fitted into the electric wire connecting portion, if the tongue portion fits into the electric wire connecting portion, the tongue portion is pushed outward and expanded, and the other end side of the cap body bulges outward. To do. Then, according to the lever principle, a stress toward the center is generated at one end side of the cap main body with a specific position as a fulcrum, and one end side of the cap main body is pressed toward the electric wire connecting portion. As a result, the adhesion between the cap body and the wire connecting portion is improved, and the waterproof property can be reliably ensured. Further, when the cap body is fitted into the wire connecting portion, the tongue portion comes into contact with the wire connecting portion to change the feel. It is possible to obtain a moderation sensation by this change in the feel, and it is possible to judge the quality of the fitted state of the rubber cap.

[0011]

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

FIG. 1 is a sectional view showing a rubber cap of a high voltage electric wire according to an embodiment of the present invention. The rubber cap of the high-voltage electric wire according to the present embodiment is composed of a cap main body 1 fitted and arranged at the end of the high-voltage electric wire 5, and a thin plate-shaped tongue 2 provided inside the cap main body 1. Has been done. The tongue 2 and the cap body 1 are integrally formed of EPDM (ethylene / propylene / diene / rubber) or silicon rubber, and the tip of the tongue 2 is tapered. Further, the cap body 1 is provided with two seal portions 3 which project inward of the cap and extend in the circumferential direction. On the other hand, the insertion terminal 4 is attached to the tip of the high-voltage electric wire 5 as in the conventional case.
The recess 4a is provided in the. Also, the electric wire connecting portion 9
In the same manner as in the prior art, it is also composed of a tubular insulator portion 7 and a receiving terminal 8 arranged along the central axis of the insulator portion 7, and the terminal 8 is provided with a recess 8a. ing.

When the rubber cap according to the present embodiment is pushed into the electric wire connecting portion 9, the tongue 2 comes into contact with the tip of the electric wire connecting portion 9, as shown in FIG. Since the tip of the tongue 2 is provided with a taper, the tongue 2 can be easily spread along the outer surface of the end of the wire connecting portion 9. The length and thickness of the tongue 2 are preferably set so that the pressure when the tongue 2 is expanded does not significantly affect the fitting force of the cap.

When the tongue portion 2 is spread out, the tongue portion 2 presses the cap body 1 from the inside as shown in FIGS. 2 and 3, and this portion bulges outward. Then,
Due to the principle of leverage, an inward stress is generated at the tip of the cap body 1 with a specific position as a fulcrum, and the sealing portion 3
The adhesion between the wire connection portion 9 and the wire connection portion 9 is improved.

In this embodiment, when the rubber cap is fitted into the electric wire connecting portion 9, the tongue portion 2 is expanded to generate an inward stress at the tip portion of the cap body 1 and the sealing portion 3 Since the adhesion between the wire connection part 9 and the wire connection part 9 is improved, sufficient waterproofness can be ensured, and the rubber cap is less likely to come off from the wire connection part, and the reliability of the waterproof property is improved. Further, since the tongue portion abuts on the electric wire connecting portion immediately before the cap main body is completely fitted to the electric wire connecting portion, the feeling changes, and a feeling of moderation can be obtained by the change in the feeling. Therefore, the rubber cap according to the present embodiment has a good fitting feeling and also has an effect of preventing fitting failure such as half fitting or non-fitting.

[0016]

As described above, according to the present invention, when the cap body is fitted to the wire connecting portion, the tongue portion provided inside the cap body is fitted to the end portion of the wire connecting portion. Therefore, the fitting feeling is good, and the quality of the fitted state can be easily judged by the feeling at the time of fitting. Also,
In the rubber cap according to the present invention, the inward stress is generated at one end of the cap main body by fitting the tongue portion to the electric wire connection portion, and the adhesion between the cap main body and the electric wire connection portion is improved. . Therefore, the cap body is less likely to come off from the wire connection portion, and the effect of improving the reliability with respect to waterproofness is also obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a rubber cap of a high voltage electric wire according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the tongue portion of the rubber cap of the high voltage electric wire according to the embodiment of the present invention is in contact with the electric wire connecting portion.

FIG. 3 is a cross-sectional view showing a state in which the rubber cap of the high voltage electric wire according to the embodiment of the present invention is fitted in the electric wire connecting portion.

FIG. 4 is a schematic diagram showing a high voltage electric wire that connects between a coil and a distributor and between a distributor and an ignition plug.

FIG. 5 is a cross-sectional view showing a rubber cap and an electric wire connecting portion of a conventional high voltage electric wire.

[Explanation of symbols]

 1; Cap body 2; Tongue part 3, 23a; Seal part 4, 29; Insertion terminal 5, 21, 22; High voltage electric wire 7, 27; Insulator part 8, 28; Receiving terminal 9, 25a, 26a; Electric wire connection part 23, 24; rubber cap 26; distributor

Claims (1)

[Claims] 1. A cap body, which is arranged to be fitted to an end portion of an electric wire, one end side of which can be fitted to an electric wire connecting portion of a member to which the electric wire is to be connected, and the electric wire which is arranged inside the cap body. A rubber cap for a high-voltage electric wire, comprising: a tongue portion fitted to an end portion of a connection portion.