JPH02831B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a connection mechanism for a twisted wire terminal formed by twisting a bundle of a large number of metal wires.

Prior art and its problems The twisted wire terminal described above consists of a bundle of many metal wires, and since each wire is twisted, many contact points are formed on its circumferential surface, and it is difficult to detect weak signals from sensors etc. The advantage is that a highly reliable connection can be expected.

The above-mentioned twisted wire terminal is intended to make contact by capturing its peripheral surface on the female connector side, and in order to ensure multi-point contact, it is preferable that the metal wire has shrinkage elasticity. For example,
No. 23592 is a hollow twisted wire with shrinkage elasticity.

In other words, this twisted wire terminal has a hollow structure in which a coarse bulge of metal wire density is previously formed on the outer periphery of the terminal and is made to be contractible. Objects are susceptible to harmful distortion and deformation, and are exposed to various deformation opportunities before use, making it impossible to use them while maintaining the proper form at the time of manufacture, and damaging the intended multi-point contact function. There is a fear.

For example, when a stranded wire terminal that has been given shrinkage elasticity is inserted into a socket whose diameter is smaller than the outer diameter of the terminal, it contracts at the inner wall of the socket, and a certain amount of contact pressure can be obtained due to the repulsive force. Due to the compressive deformation, the stranded wire terminal freely extends and escapes in the axial direction (towards the back of the socket), resulting in the problem of reducing the contact pressure by that amount.

In addition, since the twisted wire terminal according to the above conventional invention is hollow, it lacks rigidity, and in order to reinforce this, a slightly thicker core wire must be inserted into the hollow and a twisted wire must be formed around it, making it difficult to combine. This method requires the preparation of special materials, requires a large number of processing steps, and has the drawback of high costs.

Purpose of the Invention The present invention solves the above-mentioned drawbacks, and unlike the conventional connection mechanism that relies only on shrinkage elasticity given in advance to the twisted wire terminal, when the terminal is used (when connected)
The present invention provides a connection mechanism for a stranded wire terminal in which a healthy elastic pressure contact state can be formed by obtaining an elastic displacement force in the direction of compression in the female contact and expansion of the stranded wire terminal.

Further, the present invention makes it possible to obtain the desired contact state by using a twisted wire terminal having no bulges or hollows for connection, and makes it possible to perform the twisting by applying a twisted wire terminal formed by twisting a bundle of metal wires. Provides a connection mechanism for line terminals.

Structure of the Invention The present invention provides a female contact by inserting a stranded wire terminal between the contact spring pieces of a female contact serving as a receptacle, and abutting the tip of the stranded wire terminal against the bottom that defines the insertion depth. A compression state is generated within the metal wire, and the compression causes the metal wire to be displaced in the direction of expansion, that is, to generate an elastic biasing force, thereby obtaining a good elastic contact pressure with the contact spring piece.

Embodiments of the Invention FIGS. 1, 2, and 3 are drawings for understanding the basic idea of the present invention, and embodiments will be described with reference to the figures.

As mentioned above, the present invention is a connection mechanism for a twisted wire terminal formed by twisting a bundle of a large number of metal wires, and in the figure, 1 is a twisted wire terminal, and 2 is connected to the twisted wire terminal. Female contact shown.

The female contact 2 comprises opposed contact spring pieces 3 which extend along and capture the sides of the stranded wire terminal 1. The contact spring pieces 3 form a cylindrical terminal accommodating hole 4 on opposite sides thereof, and can be elastically displaced in directions that narrow or widen the hole 4 with respect to each other. Such a contact spring piece 3 is formed, for example, by inserting an appropriate number of grooves 5 into a cylindrical body. It is also formed by subjecting a plate material to equivalent punching and bending processes.

The terminal receiving hole 4 opens at the free end of the contact spring piece 3, allows insertion of the stranded wire terminal 1, and has a bottom portion at the base end opposite to the opening that defines the insertion depth of the stranded wire terminal 1. It has 6.

On the other hand, a stranded wire terminal 1 made of a bundle of metal wires 1a is integrally provided with a supporting member 7 made of a conductive metal at its base end, and has a pressing protrusion 8 made of a conductive metal at its distal end.
are all gathered together. The pressing projection 8 is preferably in the shape of an expanded arc, and its apex P is located on the axis of the twisted wire terminal. The pressing protrusion 8 is formed, for example, by melting the metal wire forming the stranded wire terminal 1 or from other fusible metal.

The twisted wire terminal 1 has a predetermined insertion clearance a2 with respect to the terminal receiving hole 4, and the female contact 2
An insertion depth a1 defined by the bottom of the insertion depth a2 is set to be shorter than the insertion depth a2. Under these setting conditions, the entire insertion allowance a2 of the stranded wire terminal 1 is pushed into the terminal accommodation hole 4, and as the stranded wire terminal is pushed in, the tip end surface of the stranded wire terminal abuts against the pressurized bottom 6 of the female contact 2, and then pushed further. Then, a relative pressurizing force (compressive force) B is applied from the pressurizing bottom part 6 to form a compressed state in the axial direction due to the dimensional difference between the insertion allowance and the insertion depth.

Through the compression, an elastic displacement force A is generated in each metal wire 1a of the twisted wire terminal 1 in a direction perpendicular to the axis according to the dimensional difference (a direction perpendicular to the compression direction), that is, in the direction of expansion. As shown in FIG. 3, an elastic contact state is formed with the inner wall surface of the contact spring piece 3.

FIGS. 7 to 9 show specific examples of the terminal compression mechanism. 7 and 8, a single-pole connector is constructed with a male connector 9 having a stranded wire terminal 1 and a female connector 10 having a female contact 2, and the stranded wire terminal 1 is centered on the male connector 9 side. female screw tube 11
A male screw tube 12 centered on the female contact 2 is provided on the female connector 10 side, and the female and male screw tubes 1
The twisted wire terminal 1 is inserted into the female contact 2 by advancing the screwing while rotating the terminals 1 and 12, so that even after the tip of the terminal 1 abuts against the pressurized bottom 6, the screwing can proceed further. In this case, the above compression is obtained. Further, FIG. 9 shows a multi-pole connector formed by a male connector 13 having a plurality of twisted wire terminals 1 and a female connector 14 having a plurality of female contacts 2, and a male screw 16 provided on the connector body and a female connector. By screwing with the screw 15, both 13 and 14 are shifted parallel to each other and are butt-fastened, and the amount of screwing is made larger than the insertion depth to compress the entire amount of insertion allowance for the twisted wire terminal into the female contact 2. An example in which the image is inserted is shown below.

As described above, the stranded wire terminal 1 is compressed in the axial direction, and due to the compression, the stranded wire terminal 1 tends to be elastically displaced in the bulging direction as shown in FIG. The spring piece 3 regulates or limits the elastic displacement and forms a contact pressure state with the contact spring piece 3 as shown in FIG. 2 or 5. For example, by using the contact spring piece 3 to make the terminal insertion hole 4 smaller in diameter than the diameter before insertion of the stranded wire terminal 1, the stranded wire terminal 1 is captured with elastic clamping pressure, and in the same state, the above-mentioned compression and It is possible to increase the contact pressure by generating an elastic displacement force in the direction of expansion. FIG. 2 shows such a contact situation.

Further, according to the present invention, the stranded wire terminal 1 is loosely inserted into the terminal insertion hole 4 formed between the contact spring pieces 3, and elastic displacement is caused in the insertion hole 4 in the compression and expansion directions to cause contact. It is possible to use a connection mechanism that obtains contact pressure with the spring piece 3.

As shown in FIG. 1, the twisted wire terminal 1 is formed by bundling metal wires and twisting them without forming a bulge or hollow part in the metal wire 1a, and inserting it into the female contact 2. Serve for connection.

Further, as shown in FIG. 4, a twisted wire terminal 1 made of a metal wire bundle with a bulge 1b and given shrinkage elasticity is used, and this is compressed in the female contact as explained in FIGS. 1 to 3. The bulge 1a is given a further elastic displacement force in the direction of the bulge, so that the bulge 1b superimposes on the contact pressure originally generated, and a higher contact pressure with the contact spring piece 3 is obtained.

FIGS. 6A, B, and C show a method of manufacturing a twisted wire terminal 1 having the above-mentioned bulge 1b from a metal wire bundle. That is, a metal wire bundle is used as the material for the stranded wire terminal 1, and a twisting force in the opposite direction as shown in FIG. 6A is applied to the metal wire bundle to form a stranded wire bundle 1'.
As shown in the figure, the ends of the twisted wire bundle 1' are clamped with chucks 17 and 18, and the chucks 17 are rotated to untwist the wire by a amount smaller than the above-mentioned amount and to make the wire bulge 1.
form b.

In the state of the twisted wire bundle 1' shown in Fig. 6A, there is a difference in the amount of twist between the outer peripheral metal wire and the core metal wire (Fig. 6A).
In the state of the twisted wire bundle 1' shown in the figure, the amount of twist of the outer peripheral metal wire is greater than that of the core metal wire, and this difference contributes to the generation of the bulge 1b due to the untwisting. The twisted wire bundle 1' has its end face fused 1
In the state of 9, it is subjected to the above-mentioned untwisting.

After the untwisting, the portion where the bulge 1b has been generated is cut using a laser 21 or the like to form the unit twisted wire terminal 1. The cut surfaces are fused 20 by laser heat or the like.

In the stranded wire terminal 1 obtained as described above, each metal wire gradually increases the amount of bulge from the core to the outer periphery, and has a bulge 1b having appropriate rigidity and good elasticity, and has a bulge 1b inside the female contact. Elastic displacement and contact pressure in a more preferable direction of expansion due to compression are achieved.

Effects of the Invention As explained above, the present invention differs from the conventional connection mechanism in which a bulge is formed in the stranded wire terminal in advance and depends only on the elasticity of the stranded wire, and the stranded wire terminal is connected to the stranded wire terminal using an elastic contact spring piece of a female contact. While being captured, compression is caused in the axial direction within the female contact to obtain an elastic displacement force in the direction of expansion, thereby forming a healthy elastic pressure contact state with the elastic contact spring piece,
Problems such as poor contact due to distortion or deformation of the bulge, such as in a connection mechanism that relies only on the elasticity of a bulge generated in advance in a twisted wire terminal, can be accurately resolved. At the same time, the problem of reducing the contact piece due to extension (relief) in the terminal axis direction that occurs when the bulge is compressed can be solved, and the relief can conversely contribute to improving the contact pressure.

Furthermore, according to the present invention, compression is generated within the female contact and elastic displacement force is obtained in the direction of expansion to obtain contact pressure, so the twisted wire terminal can be inserted into the female contact with relatively low resistance. The contact mechanism can be designed to increase appropriate contact pressure within the contact.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a cross-sectional view of the stranded wire terminal and the female contact before connection, FIG. 2 is a sectional view of the connected state, and FIG. 3 is the female stranded wire terminal. FIG. 4 is a side view illustrating the compressed state within the contact; FIG. 4 is a cross-sectional view showing another example of the stranded wire terminal and the state before connection of the stranded wire terminal and the female contact;
Figure 5 is a sectional view showing the connection state, Figure 6A,
Figures B and C are side views showing the process of manufacturing a bulged stranded wire terminal from a metal wire bundle, Figure 7 is a sectional view of the compression mechanism before connection, illustrating the compression mechanism in a single-pole connector, and Figure 8 is a view after the same connection. The sectional view, FIG. 9, is a side view after connection, illustrating the compression mechanism in a multipolar connector. DESCRIPTION OF SYMBOLS 1... Twisted wire terminal, 1a... Metal wire, 2... Female contact, 3... Contact spring piece, 4... Terminal accommodation hole, 6... Pressure bottom, 8... Pressure projection, 9, 13... Male connector,
DESCRIPTION OF SYMBOLS 10, 14...Female connector, 11...Female screw tube illustrating a compression mechanism, 12...Male screw tube.

Claims (1)

[Scope of Claims] 1. A connection mechanism for a twisted wire terminal formed by twisting a bundle of a large number of metal wires, wherein a female contact that receives the twisted wire terminal captures the same side surface along the side surface of the twisted wire terminal. The proximal end of the contact spring piece into which the stranded wire terminal is inserted is provided with a contact spring piece that is extended as far as possible, and the stranded wire terminal is inserted into the base end of the contact spring piece such that the stranded wire terminal abuts the tip end surface of the stranded wire terminal to be inserted and the depth of insertion of the stranded wire terminal. The insertion depth defined by the bottom is set to be shorter than the insertion allowance of the stranded wire terminal, and the entire insertion allowance of the stranded wire terminal is set to be shorter than the insertion depth of the stranded wire terminal. A terminal compression mechanism is provided which presses the stranded wire terminal between the strands and abuts the tip end surface of the stranded wire terminal with the bottom part to form a compressed state in the female contact in the axial direction of the stranded wire terminal, and the stranded wire terminal is compressed in the female contact by the compression in the female contact. A connection mechanism for a stranded wire terminal, characterized in that the metal wire of the wire terminal is configured to apply an elastic displacing force in the direction of expansion of the dimensional difference between the insertion margin and the insertion depth to form an elastic contact pressure state with a contact spring piece. . 2. The stranded wire terminal has a pressure projection protruding in the axial direction at its tip, and the apex of the pressure projection is located on the axis of the stranded wire terminal, and when the apex and the bottom portion collide, the The invention according to claim 1, characterized in that the female contact is configured to obtain compression within the female contact.