JPH10270101A - Cable connection portion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach and detach a male terminal and a female terminal easily and surely in a connection portion of a power cable or the like. SOLUTION: In a cable connection portion formed by inserting a male terminal 1 equipped with an outer periphery protrusion 3 into a female terminal 2 equipped with inner periphery protrusion 5 so as to engage both protrusions 3, 5 with each other, a diameter enlarging jig 11 is externally fitted to the male terminal 1. By setting the angles of the engaging faces of the respective protrusions 3, 5 to the axis to be 90 deg. or more, when both protrusions 3, 5 are engaged, both are surely connected. When the male terminal 1 is extracted from the female terminal 2, it is just required to thrust the diameter enlarging jig 11 into the opening portion of the female terminal 2 so as to spread the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable connecting portion used for connecting a conductor such as a power cable.

[0002]

[Prior art]

(1) Conventional connection parts are shown in FIGS. 2A is a cross-sectional view of a connection portion in a connected state, FIG. 2B is a cross-sectional view of an outer circumference protrusion and an inner circumference protrusion of each of the male and female terminals, and FIG. 3 is a view of the connection portion before the spacer is inserted into a predetermined position. It is sectional drawing.

[0003] This connection portion is formed by inserting the male terminal 21 into a tulip contact that becomes the female terminal 22 (see FIG. 2A). An outer peripheral projection 23 is formed on the male terminal 21 and an inner peripheral projection 24 is formed on the tulip contact.
4 prevents the two terminals 21 and 22 from coming off.

Normally, the engagement surfaces 25, 26 of the projections 23, 24 are formed at an angle of 90 ° or less with respect to the axis (see FIG. 2B).
At the time of connection, the male terminal 21 is press-fitted into the opening of the tulip contact, and inserted while pushing open this opening. The outer periphery of the opening of the female terminal 22 is held by the spacer 27 so that the opening does not open even if a pulling force acts after the connection. The spacer 27 is cylindrical and is arranged at a position covering the insulating layer peeling portion of the cable terminal on the inner periphery of the embedded conductor 28 of the connection box, one end is circumscribed to the female terminal 22, and the other end is the cable insulating layer 29. Is circumscribed to When removing the connecting portion, the male terminal 21 may be pulled out firmly after the spacer 27 is removed.

(2) As a connecting portion structure without using a spacer, Japanese Unexamined Utility Model Publication No. 1-134360 discloses a tulip contact in which the angle of the engaging surface is 90 ° or more with respect to an axis. .

[0006]

However, the connection box structure shown in FIGS. 2 and 3 increases the total length of the connection box (see FIG. 3). To insert the male terminal 21 into the female terminal 22 and attach the spacer 27, the rubber insulator 30 is fitted to the outer periphery of the cable insulating layer 29, and then shifted to a position where it does not hinder the insertion of the spacer 27. There is a need. Therefore, a distance longer than the total length of the spacer 27 and the rubber insulator 30 is required from the insulating portion end 31 of the connection box to the peeled end of the cable sheath 32.

On the other hand, Japanese Utility Model Laid-Open Publication No. 1-134360 does not disclose a technique for easily disconnecting the once connected male terminal and tulip contact.

Accordingly, it is a primary object of the present invention to provide a cable connection portion which can be securely connected and which can be easily removed.

[0009]

According to the present invention, in order to achieve the above object, a male terminal having an outer peripheral projection is inserted into a female terminal having an inner peripheral projection, and both projections are engaged with each other. In the cable connection portion, the male terminal is externally fitted with a diameter-enlargement jig which is press-fitted into the opening of the female terminal and pushes the opening (the inner diameter of the inner peripheral projection) beyond the outer diameter of the outer peripheral projection. It is characterized by having. The use of this diameter expanding jig requires that the angle of the engagement surface of each projection of the male terminal and the female terminal with respect to the axial direction be 90 degrees.
It is particularly effective when the angle is equal to or more than °. In this case, the two terminals cannot be separated by simply pulling the terminals, but the two terminals can be easily separated by opening the female terminals using a diameter-expanding jig. Of course, the present invention is effective when a strong force is required to pull out both terminals even if the angle is 90 ° or less.

The diameter increasing jig includes a cylindrical portion fitted to the male terminal and a flange integrated with one end of the cylindrical portion. The other end of the cylindrical portion is tapered. Those are preferred.

In particular, the diameter-expanding jig is configured so as to be able to be divided in the circumferential direction, and the divided pieces are connected by an elastic body. It is desirable to make the sliding resistance between the surface and the outer peripheral surface of the male terminal larger than the sliding resistance between the male conductor and the female conductor.

[0012]

Embodiments of the present invention will be described below. FIG. 1A is a cross-sectional view of the connecting portion of the present invention, and FIG. 1B is a cross-sectional view showing an outer peripheral projection and an inner peripheral projection of both male and female terminals.

The connecting portion of the present invention is assembled by inserting the male terminal 1 into a tulip contact which becomes the female terminal 2. The male terminal 1 is cylindrical and has an outer peripheral projection 3 on one end side.
The other end is crimped to the outer periphery of the conductor 4 exposed from the cable end. The tip of the male terminal 1 is formed in a tapered shape, and has a shape that can be easily inserted into the female terminal 2.

On the other hand, the female terminal 2 has an inner peripheral projection 5 which engages with the outer peripheral projection 3 of the male terminal 1 at the opening. The surface extending from the outer peripheral edge of the opening to the inner peripheral projection 5 is constituted by a curved surface,
The tip of is easily press-fitted. The opening is formed with an axial split groove (not shown) and is opened in the radial direction, and a ring-shaped spring 6 is fitted on the outer periphery thereof, so that the opening can be tightened to the inner peripheral side. . The female terminal 2 has a projection 7 at the center thereof engaged with an outer peripheral groove 9 formed on the other conductor terminal 8, and the inner portion has substantially the same configuration as the opening.

Here, the engagement surfaces 3A, 5A of the outer peripheral projection 3 and the inner peripheral projection 5 are set at 90 ° or more with respect to the axis (see FIG. 1B). Therefore, when the male terminal 1 is inserted into the female terminal 2 and the outer peripheral projection 3 and the inner peripheral projection 5 are engaged, the female terminal 2 does not open and the male terminal 1 does not come off even if a pulling force is applied.

The male terminal 1 is provided with a diameter-enlargement jig 11 that pushes the opening of the female terminal 2 when the connecting portion is disassembled. The diameter increasing jig 11 is a cylindrical portion fitted to the male terminal 1
11A and a flange portion 11B connected to one end of the cylindrical portion 11A. The other end of the cylindrical portion 11A is formed in a tapered shape,
The female terminal 2 is configured to be easily pressed into the opening. The diameter increasing jig 11 is located between the outer peripheral projection 3 and the crimping portion of the cable conductor, and is arranged with the flange portion 11B facing the crimping portion side.

When disassembling the connecting portion, first, a rubber insulator (not shown) is pulled out and cut, and then removed from the outer periphery of the cable insulating layer 12. Next, the male terminal 1 is pushed toward the female terminal 2 to release the engagement between the two projections 3 and 5. Further, the flange portion 11B is pressed with a suitable tool, and the diameter expanding jig 11 is press-fitted between the opening of the female terminal 2 and the male terminal 1. By this press-fitting, the opening (the inner peripheral projection 5) of the female terminal 2 rides on the cylindrical portion 11A of the diameter increasing jig, and is expanded in the radial direction. Then, when the inner diameter of the inner peripheral projection 5 of the female terminal 2 is expanded to be larger than the outer diameter of the outer peripheral projection 3 of the male terminal 1, when the male terminal 1 is pulled out, the connection portion can be easily disassembled.

Here, the diameter expanding jig 11 is configured to be easily slidable in the axial direction on the male terminal. However, the sliding resistance between the inner periphery of the cylindrical portion 11A and the outer periphery of the male terminal is reduced by the male terminal 1 and the female terminal. 2 may be larger than the sliding resistance. With this configuration,
The engagement between the outer and inner peripheral projections 3 and 5 can be released only by pressing the diameter increasing jig 11.

Specific examples thereof include the following two configurations. The diameter-expanding jig is configured to be divided in the circumferential direction, and the divided pieces are connected by a spring so that the outer periphery of the male terminal 1 can be tightened and attached. A material having a large sliding resistance, such as rubber, is interposed on the inner surface of the cylindrical portion so that the diameter increasing jig does not easily move in the axial direction. In any case, when the diameter-expanding jig is pressed in the axial direction by a suitable tool, the male terminal 1 is first moved integrally with the diameter-expanding jig to the inner part of the female terminal 2 and the outer peripheral projection 3 and the inner terminal 3 are pressed. The engagement of the circumferential projection 5 is released, and then the diameter increasing jig is slid on the male terminal. Therefore, the engagement of the two projections by the pushing of the male terminal 1 and the press-fitting of the diameter increasing jig can be performed at the same time, and the disassembly work of the connecting portion can be performed more easily.

In the above description, the case where the angle of the engagement surface of both projections with respect to the axial direction is 90 ° or more is exemplified. However, the present invention is not limited to this configuration, and the angle is 90 ° or less. (See FIG. 2B).

[0021]

As described above, the connecting portion of the present invention has the following effects. The female terminal can be easily opened by providing the diameter-expanding jig externally fitted to the male terminal. Therefore, the disassembly work of the connection portion can be easily performed. In particular, disassembly work can be easily performed even at a connection portion where the engagement surface between the outer peripheral projection and the inner peripheral projection is 90 ° or more with respect to the axis. The connection of the present invention does not require the spacer used in the connection of FIG. Therefore, the axial space required for mounting the spacer is not required, and the total length of the connection box can be reduced.

[Brief description of the drawings]

1A is a cross-sectional view of a connecting portion of the present invention, and FIG. 1B is a cross-sectional view showing an outer peripheral projection of a male terminal and an inner peripheral projection of a female terminal.

FIG. 2A is a cross-sectional view of a conventional connecting portion, and FIG. 2B is a cross-sectional view showing an outer peripheral projection of a male terminal and an inner peripheral projection of a female terminal.

FIG. 3 is a cross-sectional view showing a state in which the connecting portion of FIG. 2 is being assembled.

[Explanation of symbols]

1 Male terminal 2 Female terminal 3 Outer periphery projection 3A Engagement surface
4 Conductor 5 Inner circumference protrusion 5A Engagement surface 6 Spring 7 Protrusion 8 Conductor terminal 9 Outer groove 11 Large diameter jig 11A Cylindrical part 11B Flange part 12 Cable insulation layer

Claims (4)

[Claims] 1. A cable connection portion formed by inserting a male terminal having an outer peripheral projection into a female terminal having an inner peripheral projection and engaging both projections, wherein the male terminal has an opening of the female terminal. A cable connecting portion, wherein a diameter-enlargement jig which is press-fitted into the portion and pushes the opening beyond the outer diameter of the outer peripheral projection is fitted. 2. The diameter-enlargement jig includes a cylindrical portion fitted to the male terminal and a flange integrated with one end of the cylindrical portion, and the other end of the cylindrical portion is formed in a tapered shape. The cable connecting part according to claim 1, wherein 3. The enlarged diameter jig is configured to be able to be divided in the circumferential direction, and each divided piece is connected by an elastic body, and the enlarged diameter jig is attached so as to tighten the outer periphery of the male terminal. The cable connecting part according to claim 2, wherein 4. The cable connecting portion according to claim 2, wherein the sliding resistance between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the male terminal is larger than the sliding resistance between the male terminal and the female terminal.