JPH07282944A - Method for making pressure-contact terminal pressure-contact with wire and structure of that terminal - Google Patents

Abstract

PURPOSE:To obtain a method for making a pressure-contact terminal pressure-contact with a wire and the structure of the pressure-contact terminal, which has the high electrical contact reliability and which can be automatically assembled at low cost. CONSTITUTION:A pressure-contact blade 4 of a pressure-contact terminal 1 is provided with a U-slot 5, in which a coated wire 15 is to be pressed, at a central part thereof, and projecting pieces 6, 7 are respectively formed in the upper part of both sides of the U-slot 5. One projecting piece 7 of these projecting pieces is provided with a fitting groove 8, which is nearly horizontally notched in the U-slot 5 direction. A press-in fitting part 2 is integrally extended from a side surface of a connection part 1B corresponding to the pressure-contact blade 4 of the side, which is not formed with the fitting groove 8. This press-in fitting part 2 is folded from the base end thereof in the pressure-contact blade 4 direction, and a slit-like opening part 3 is provided in the central part of the press-in fitting part 2. In this opening part 3, both projecting pieces 6, 7 of the pressure-contact blade 4 are projected when the press-in fitting part 2 is folded, and the press-in fitting part 2 is locked with the fitting groove 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for pressure-welding a covered electric wire to a pressure-contact blade of a pressure-contact terminal and a pressure-contact terminal structure. More specifically, the wire of the pressure-contact terminal is suitable for preventing deterioration of the pressure-contact portion over time and is suitable for automation. The present invention relates to a pressure welding method and a pressure welding terminal structure.

[0002]

2. Description of the Related Art For example, in a connection wire for a high current to a multi-pole switch used in an electric vehicle or the like, a pressure contact terminal equipped with a pressure contact blade is widely used in order to speed up the connection work. Has been done. This pressure contact terminal is for electrically connecting by connecting a connecting electric wire to a pressure contact portion called U slot, for example, and the one disclosed in Japanese Utility Model Laid-Open No. 53-117988 is known.

The pressure contact terminal shown in FIGS. 7 and 8 comprises a housing 51 and a piercing terminal 54. A covered electric wire 59 is inserted into an electric wire insertion hole 52 provided in the housing 51, and the housing 51 is inserted in the direction of an arrow 60. Press down strongly. As a result, the press contact blade of the piercing terminal 54 is covered with the covered electric wire 5.
The covering portion of 9 is peeled off, and the core wire of the covered electric wire 59 is electrically connected to the U slot 55 of the piercing terminal 54.

Also, as a type different from the above, one disclosed in Japanese Utility Model Laid-Open No. 56-1368 is known. The pressure contact terminals shown in FIG. 9 and FIG.
1 and the electric wire connection plate portion 62, the covered electric wire 63 is placed on both projecting pieces 62A and 62B of the electric wire connection plate portion 62, and the electric wire press-fitting notch portion 61 of the compression fitting 61 is arranged from above.
B is overlaid. Next, the compression metal fitting 61 is strongly pushed downward, so that the compression metal fitting 61 pushes the covered electric wire 63 into the U slot 62C in the central portion of the electric wire connection plate portion 62. The U-slot 62C peels off the covering portion of the covered electric wire 63 that is pressure-welded to form a core wire 63A of the covered electric wire 63.
By making contact with, the covered electric wire 63 and the electric wire connecting plate portion 62 are electrically connected.

By the way, in a press-contact terminal having a press-contact portion such as a U-slot, the U-slot for press-contacting the covered electric wire deteriorates with time after the electric wire press-contact, that is, stress is relieved, so that the reliability of the contact surface is deteriorated. There is. In the press-contact terminal having the above-described structure, the specific component works to compensate for the deterioration of the contact state due to stress relaxation. For example, in the configuration of FIG. 8, the housing 51 holds the upper portion of the piercing-type terminal 54, which press-contacts the covered electric wire 59, in the inner cavity 53, whereby the upper portion of the piercing-type terminal 54 can be regulated.

Further, in the configuration of FIG. 10, the compression fitting 6
1 in the U-slot compression opening 61A, and the covered electric wire 6
Since the upper part of the electric wire connection plate portion 62 to which 3 is pressed is sandwiched,
The movement of the upper portion of the wire connection plate portion 62 is restricted. That is, in any of the conventional examples, the accessory parts prevent deterioration of the contact state due to deterioration of the U slot with time.

[0007]

However, in the pressure contact terminal having the above-mentioned structure, the cost increases with the increase in the number of parts such as the pressure contact metal fittings and the housing, and since the number of parts is large, it is difficult to manage the parts and make connection work. There is a problem that it becomes complicated. In addition, in order to automate the assembly of the wire harness, it is difficult to automatically supply components such as the crimp fitting and the housing. Further, the pressure contact terminal shown in FIG. 7 has a problem that it is difficult to automate the wire insertion into the wire insertion hole.

The object of the present invention is to solve the above problems, and high electrical contact reliability,
Another object of the present invention is to provide an electric wire pressure welding method and a pressure welding terminal structure for a pressure welding terminal, which can achieve automated assembly at low cost.

[0009]

The above object of the present invention is to provide an electric connecting portion into which a mating connecting terminal is fitted and inserted at a front end portion, and a wire holding portion at a rear end portion to which a covered electric wire is crimped, and an intermediate portion. In the wire pressure welding method of the pressure contact terminal in which the pressure contact blade having the U slot into which the coated electric wire is press-fitted and connected to the connecting portion of the portion is arranged, after the covered electric wire is placed on the pressure contact blade,
By bending the press-fitting engagement plate integrally provided with the press-contact terminal for preventing the spread of the press-contact blade, press-fitting of the covered electric wire to the press-connecting blade is performed, and the press-connecting blade is corrected and locked. It can be achieved by a method of crimping an electric wire of a crimping terminal.

Another object of the present invention is to provide an electric connecting portion into which a mating connecting terminal is fitted and inserted in a front end portion thereof, an electric wire holding portion at a rear end portion thereof to which a covered electric wire is crimped, and a connecting portion of an intermediate portion. In a wire pressure welding method of a pressure contact terminal in which a pressure contact blade having a U slot into which a coated electric wire is press-fitted and connected is provided, a wire is press-fitted into the pressure contact blade and is integrally provided with the pressure contact terminal to prevent expansion of the pressure contact blade. The press-fitting engagement plate is bent on the press-connecting blade, whereby at least the press-connecting blade is corrected or locked, which can be achieved by a wire press-connecting method for a press-connecting terminal.

Further, the above object of the present invention is to provide an electric connecting portion into which a mating connecting terminal is fitted and inserted in a front end portion thereof, an electric wire holding portion at a rear end portion thereof to which a covered electric wire is crimped, and a connecting portion of an intermediate portion. In a press-contact terminal structure in which a press-contact blade having a U slot into which a coated electric wire is press-fitted and connected is provided, an press-fit engagement plate for preventing expansion of the press-contact blade is provided with an opening for locking the press-contact blade. This can be achieved by a pressure contact terminal structure characterized by being integrally provided in a bendable state on at least one side wall portion of the pressure contact terminal.

For the above-mentioned purpose, an engaging groove for engaging the press-fitting engaging plate is provided on at least one side of the press-contacting blade, and is engaged with the opening edge of the opening when the press-fitting engaging plate is bent. It is achieved by

The above object is also achieved by providing a projecting piece, which projects from the opening and locks the press-fitting engagement plate when the press-fitting engagement plate is bent, on the upper end of the press-contact blade.

[0014]

In the wire pressure welding method of the pressure contact terminal according to the present invention, after the covered electric wire is placed on the pressure contact blade, the press fit engagement plate integrally provided with the pressure contact terminal for preventing expansion of the pressure contact blade is provided. By being bent, the covered electric wire is pressed into the press contact blade, and the press contact blade is corrected and locked. As a result, the press-fit engagement plate pushes down the covered electric wire to press-fit it into the U slot of the press-contact blade, and the press-fit engagement plate is locked by the press-contact blade, so that the press-contact blade is corrected to a normal state and is not displaced. Locked in.

Further, in the wire pressure welding method for the pressure contact terminal according to the present invention, after the wire is pressed into the pressure contact blade, the press fit engagement plate integrally provided with the pressure contact terminal for preventing the expansion of the pressure contact blade is provided on the pressure contact blade. By being bent, at least the press contact blade is corrected or locked. Accordingly, the press-fitting engagement plate is locked to the press-contact blade, so that at least the press-contact blade is corrected to a normal state or locked so as not to be displaced.

Further, in the press contact terminal structure according to the present invention, an opening portion for locking the press contact blade is provided, and a press fit engagement plate for preventing expansion of the press contact blade is provided on at least one side wall portion of the press contact terminal. It is integrally provided in a bendable state. Thereby, when the press-fitting engagement portion is bent, the covered electric wire placed on the press-contact blade is pushed down and press-fitted into the U slot of the press-contact blade. At the same time, the upper end of the press contact blade protrudes from the opening of the press fit engagement part and is locked, thereby correcting the press contact blade to a normal state and preventing displacement of the press contact blade in the longitudinal direction of the press contact terminal. Locked to do.
Therefore, it is possible to reliably prevent the deterioration of the contact force with time due to stress relaxation or the like.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the wire pressure welding method for a pressure contact terminal and the pressure contact terminal structure of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a perspective view showing an embodiment of a pressure contact terminal structure according to the present invention. 2 is a view as seen from the arrow a in FIG.
3 is a perspective view of FIG. 1 viewed from the arrow b, FIG. 4 is a perspective view showing a state in which the covered electric wire of FIG. 1 is placed on a press contact blade, FIG. 5 is a view of the arrow c of FIG. 4, and FIG. It is a perspective view showing the completion state of press contact of a covered electric wire.

As shown in FIG. 1, the pressure contact terminal 1 of the present embodiment.
Is a press-connecting terminal which is provided with an electric connection portion 11 into which a mating connection terminal is inserted and which is provided at a front end, and an electric wire holding portion 12 to which a covered electric wire is crimped, at a rear end, and which is continuously provided with a connecting portion 1B opened upward. It is composed of a main body 1A and a press contact blade 4 which is disposed substantially in the center of the connecting portion 1B and to which a covered electric wire is press connected. The press contact blade 4 is provided with a U slot 5 into which a covered electric wire 15 is press-fitted in the central portion thereof, and projecting pieces 6 and 7 are formed at upper portions of both sides of the U slot 5. An engaging groove 8 cut substantially horizontally in the U slot 5 direction is provided in one of the projecting pieces 7 of the projecting piece.

Further, as shown in FIG. 2, inclined portions 6A and 7A are formed on the U-slot 5 side of both projecting pieces 6 and 7 in consideration of the press fit of the covered electric wire. The press-fitting engagement portion 2 is a connecting portion 1 corresponding to the press-contact blade 4 on the side where the engagement groove 8 is not provided.
It is integrally extended from the B side surface upward and is bent in the direction of the press contact blade 4 from the base end thereof. A slit-shaped opening 3 is provided at the center of the press-fit engagement portion 2.

As shown in FIGS. 2 and 3, the length dimension L of the opening 3 in the direction perpendicular to the longitudinal direction of the pressure contact terminal is determined by the pressure contact blade 4
The width is set to be substantially equal to the lateral width K at the position of the engaging groove 8. That is, the size of the opening 3 is set so that both projecting pieces 6 and 7 of the press contact blade 4 can be sandwiched and the opening edge of the opening 3 can be locked by the engagement groove 8.
In addition, the width M of the opening 3 in the terminal longitudinal direction is determined by the pressure contact blade 4
Is set to be slightly larger than the plate thickness N.

Next, as shown in FIGS. 4 and 5, after the covered electric wire 15 is placed on the inclined portions 6A and 7A of the projecting pieces 6 and 7 of the press-contact blade 4, the press-fit engagement portion 2 is placed on the covered electric wire 15. The base end portion 2A is bent in the direction of the press contact blade 4. The lower surface of the press-fitting engagement portion 2 that rotates with this bending pushes down the covered electric wire 15 and press-fits it into the U slot 5 of the press-contact blade 4. This U slot 5
When the covered electric wire 15 is press-fitted into the covered electric wire 15,
A is peeled off by the side edge of the U slot 5, and the conductor 15B and the press contact blade 4 are electrically connected.

Then, as shown in FIG. 6, the press-fitting engagement portion 2 pushes down the covered electric wire 15 and press-fits it into the U slot 5, and at the same time, both projecting pieces 6 and 7 of the press-contact blade 4 are opened in the press-fitting engagement portion 2. 3 and the opening edge of the opening 3 grips both protruding pieces 6 and 7 of the press contact blade 4. As a result, the expansion of the U-slot 5 caused by the press-fitting of the covered electric wire 15 is corrected, and the displacement thereof is regulated to prevent the contact force from deteriorating due to stress relaxation or the like. Further, it also prevents the press contact terminal of the press contact blade 4 from falling in the longitudinal direction.

Further, since the engagement groove 8 of the press contact blade 4 locks the opening 3 of the press-fit engagement portion 2 when the electric wire pressure contact is completed, the covered wire 15 is surely prevented from being lifted up by an external force such as vibration. It Furthermore, since the covered electric wire 15 can be set from above the connecting portion 1B which is open upward, automation of the electric wire pressure welding step can be realized.

As described above, according to the present embodiment, the covered electric wire 15 is press-fitted into the press-contact terminal 1 during the bending process of the press-fit engagement portion 2 and is locked by the press-fit engagement portion 2 so that the press-contact blade 15 is pressed. Displacement of No. 4 is regulated, and contact failure due to stress relaxation of the pressure contact portion and detachment of the covered electric wire 15 are reliably prevented. Further, since the bent press-fitting engagement portion protects the electric wire press-fitting portion, adhesion of dust and the like can be reduced, and damage due to collision of foreign matter can be avoided.

In the above embodiment, the covered electric wire 15 was press-fitted into the press-contact terminal 1 during the bending process of the press-fitting engagement portion 2, but the bending process of the press-fitting engagement portion 2 is performed after the press-fitting process of the covered electric wire 15 is completed. It is also possible to do so. Further, in the above embodiment, the displacement of the press contact blade 4 is restricted by one press fit engagement portion 2, but it is also possible to provide a pair of press fit engagement portions 2 on both side surfaces of the connecting portion 1B. It is possible to realize more firm displacement regulation of the press contact blade 4.

[0026]

As described above, in the wire pressure welding method and the pressure welding terminal structure of the pressure welding terminal according to the present invention, the pressure welding blade is provided with the opening portion for preventing the expansion of the pressure welding blade. The press-fitting engagement plate is integrally provided on at least one side wall portion of the press-connecting terminal in a bendable state. As a result, the press-fitting engagement plate pushes down the covered electric wire and the U of the press-contact blade is pressed.
When the press-fitting engagement plate is pressed into the slot and the press-fitting engagement plate is locked to the press-contact blade, the press-contact blade is corrected to a normal state and locked so as not to be displaced. Therefore, it is possible to reliably prevent deterioration of the contact force due to stress relaxation or the like over time, and to obtain high reliability for the pressure contact terminal.
Since the assembling can be automated and the number of processes and the number of parts can be reduced, workability can be improved and manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a pressure contact terminal structure according to the present invention.

FIG. 2 is a view on arrow a in FIG.

FIG. 3 is a view on arrow b in FIG.

FIG. 4 is a perspective view showing a state in which a covered electric wire is placed on the press contact terminal of FIG.

5 is a view on arrow c in FIG. 4. FIG.

FIG. 6 is a perspective view showing a state in which the pressure-welding of the covered electric wire in FIG. 4 is completed.

FIG. 7 is a plan view of a conventional pressure contact terminal.

8 is a perspective view showing a state in which the pressure-welding of the covered electric wire in FIG. 7 is completed.

FIG. 9 is a perspective view of another conventional pressure contact terminal.

10 is a perspective view showing a state in which the pressure-welding of the covered electric wire in FIG. 9 is completed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressure contact terminal 1A Pressure contact terminal body 1B Connection part 2 Press fit engagement part 3 Opening part 4 Press contact blade 5 U slot 6,7 Projecting piece 8 Engagement groove 15 Coated wire

Claims (5)

[Claims] 1. An electric connection portion into which a mating connection terminal is fitted and inserted is provided at a front end portion, an electric wire holding portion is provided at a rear end portion for crimping a covered electric wire, and a covered electric wire is press-fitted and connected to a connecting portion at an intermediate portion. In a method of crimping a wire of a crimping terminal having a crimping blade having a U-slot, a covered electric wire is placed on the crimping blade, and is integrally provided with the crimping terminal for preventing expansion of the crimping blade. By bending the press-fitting engagement plate, the covered electric wire is press-fitted into the press-connecting blade, and the press-connecting blade is straightened and locked. 2. An electric connecting portion into which a mating connecting terminal is fitted and inserted is provided at a front end portion, an electric wire holding portion is provided at a rear end portion for crimping a covered electric wire, and a covered electric wire is press-fitted and connected to a connecting portion in an intermediate portion. In a method of wire-pressing an electric wire for a press-connecting terminal having a press-connecting blade having a U-slot, a press-fitting engagement plate integrally provided with the press-connecting terminal is provided for preventing expansion of the press-connecting blade after press-fitting the wire into the press-connecting blade. A method for crimping an electric wire of a crimping terminal, wherein at least the crimping blade is straightened or locked by being bent on the crimping blade. 3. An electric connecting portion into which a mating connecting terminal is fitted and inserted is provided at a front end portion, an electric wire holding portion to which a covered electric wire is caulked is provided at a rear end portion, and a covered electric wire is press-fitted and connected to a connecting portion at an intermediate portion. In a pressure contact terminal structure in which a pressure contact blade having a U-slot is provided, an opening portion for locking the pressure contact blade is provided, and a press-fit engagement plate for preventing expansion of the pressure contact blade is at least one of the pressure contact terminals. A pressure contact terminal structure, which is integrally provided in a side wall portion of the foldable state. 4. An engagement groove for locking the press-fit engagement plate is provided on at least one side of the press-contact blade, and when the press-fit engagement plate is bent, the engagement groove is provided at an opening edge of the opening. The press contact terminal structure according to claim 3, which is locked. 5. The press-connecting terminal structure according to claim 3, wherein a projecting piece that protrudes from the opening and locks the press-fitting engagement plate when the bending of the press-fitting engagement plate is completed is provided at an upper end portion of the press-connecting blade.