JP4577194B2 - Electrical connection terminal - Google Patents

Description

  The present invention relates to an electrical connection terminal, and more particularly to an electrical connection terminal having excellent conductivity suitable for a device that requires a large current.

  Conventionally, as this kind of electrical connection terminals, for example, those described in Patent Document 1 are known. FIG. 9 is a perspective view showing an example of a conventional electrical connection terminal. As shown in FIG. 9, this electrical connection terminal 21 is a female connection terminal having a plate-shaped male connection terminal 22 and a flat rectangular insertion opening (connection portion) 23a into which the male connection terminal 22 is inserted. 23. A spring piece 24 that presses the male connection terminal 22 against an electrical contact portion (not shown) on the other surface is provided on one side of the insertion opening 23a.

  Generally, when using the above-mentioned shape as an electrical connection terminal of a device that requires a large current, attention must be paid to the prevention of heat generation and arcing. In this case, it is necessary to reduce the electrical resistance of the contact portion between the male connection terminal and the female connection terminal. To that end, it is necessary to increase the contact points between the male connection terminal and the female connection terminal as much as possible. There is.

Japanese Patent No. 2878429

  However, in the electrical connection terminal 21, only one contact surface (the surface opposite to the surface pressed by the spring piece 24) contributes to electrical contact, and the number of contact points is increased. Is difficult.

  Further, in order to reduce the electrical resistance of the male connection terminal 22 and the female connection terminal 23, it is necessary to press the male connection terminal 22 and the female connection terminal 23 with an appropriate force by the spring piece 24 of the female connection terminal 23. However, in order to manufacture the spring piece 24, difficult techniques such as a process of the spring piece 24 and management of the spring size are necessary.

  Furthermore, the terminal material needs to have both conductivity and spring property, but since there is no suitable material that has high conductivity and spring property, the conductivity is low and spring property can be obtained. Currently, materials are used, and the only way to deal with large currents is to increase the terminal volume.

  As described above, the electrical connection terminal 21 has a complicated structure and is forced to be large in order to cope with a large current, inferior in manufacturability and productivity, and high in cost.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electrical connection terminal that solves the above-described problems of the prior art, has a simple structure, can cope with a large current, and can be reduced in size and improved in productivity.

Of the present invention, the invention according to claim 1 is an electrical connection terminal comprising a male connection terminal having a connection portion having a circular cross section and a female connection terminal into which the male connection terminal is fitted. connection terminal is a cross-sectional triangle of the tubular so as to have three surfaces that Sessu the outer peripheral surface of the male connecting terminal has a connecting portion having a slit on one corner, the connecting portion A spring auxiliary member having a cross section having a cut at one corner and similar to the connection portion is fitted to the outer periphery of the spring, and the cut of the connection portion is different from the cut of the spring auxiliary member. The male connection terminal is set so that the inscribed circle of the connection portion of the triangular connection section of the female connection terminal is smaller in diameter than the outer diameter of the connection section of the circular connection section of the male connection terminal. Is inserted into the connection portion of the female connection terminal. Wherein the connecting portion of the triangular cross section of the connection terminals are spread.

According to the first aspect of the present invention, in the electrical connection terminal comprising the male connection terminal having a connection section having a circular cross section and the female connection terminal into which the male connection terminal is fitted, the female connection terminal is , because it has a tubular connecting portion of the cross-sectional triangle to have three faces that Sessu the outer peripheral surface of the male connecting terminal may correspond to the large current structure is simple, compact , Improve productivity and reduce costs.

Also, the connection part is, since it has a cut in one corner, possible to easily manufacture a female connector terminal having a tubular connecting portion of the cross-sectional triangle by bending a piece of metal plate And a spring force or pressing force can be secured.

Further, the outer periphery of the connection portion may have a break spring assisting member triangular section which is similar in shape with the connecting portion is fitted in one corner, and a break cuts the spring support member connecting portion Since they are arranged at different positions, it is possible to reinforce the spring force or pressing force of the connecting portion, and it is possible to ensure an equal pressing force on the three surfaces.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings. 1 is a perspective view schematically showing an electrical connection terminal according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a connection portion having a cut in the female connection terminal, and FIG. 3 is a cut in the female connection terminal. FIG. 4 is a cross-sectional view showing the shape of a contact point with the male connection terminal in the connection part of the female connection terminal.

  In FIG. 1, reference numeral 1 denotes an electrical connection terminal excellent in conductivity suitable for a device requiring a large current. The electrical connection terminal 1 includes a male connection terminal 2 having a circular cross section and a male connection terminal 2. It consists of a female connection terminal 3 to be fitted. The male connection terminal 2 has a pin shape with a circular cross section. The male connection terminal 2 has a connection portion 2 a that is inserted and fitted into the connection portion 3 a of the female connection terminal 3.

  A cable conductor connecting portion 4 for connecting a cable conductor (not shown) is provided at the rear end of the connecting portion 2a. A taper portion 2c is provided between the cable conductor connection portion 4 and the connection portion 2a. The male connection terminal 2 can be easily formed or manufactured by rounding a metal plate (metal plate) or using a metal round bar.

  On the other hand, the female connection terminal 3 has a connection portion 3a having a triangular cross section at the tip, and a cable conductor connection portion 5 for connecting a cable conductor (not shown) is provided at the rear end of the connection portion. The female connection terminal 3 can be easily formed or manufactured by cutting and bending a metal plate (metal plate). That is, as shown in FIG. 2, the connection portion 3a of the female connection terminal 3 is formed in a cylindrical shape having a triangular cross section by bending a metal plate into a triangular shape, and is formed by bringing both end portions close to each other. It is set as the structure which has the cut | interruption 6 whose one corner | angular part made is an open end.

  In the electrical connection terminal 1, the inscribed circle of the connection part 3 a having a triangular cross section of the female connection terminal 3 is set to have a smaller diameter than the outer diameter of the connection part 2 a of the male connection terminal 2 having a circular cross section. Yes. The cable conductor connection portion 5 of the female connection terminal 3 is bent into a U-shaped cross section or a U-shaped cross section, and a cable conductor (not shown) is connected and fixed to the cable conductor connection portion 5 by caulking it. .

  The material of the female connection terminal 3 and the male connection terminal 2 is copper or a copper alloy, and the surface of the connection part 3a of the female connection terminal 3 and the connection part 2a of the male connection terminal 2 (surface on the contact side). In order to reduce contact resistance, it is preferable that a plating treatment of tin, gold, silver or the like is performed.

  The connection part 3a of the female connection terminal 3 may have a cut 6 at one corner of a cross-sectional triangle, but may not have a cut as shown in FIG. In this case, the cut 6 that is the open end of the connecting portion 3a is closed by welding and brazing, and a structure (closed loop structure) in which all three ends (three corners) of the cross-sectional triangle are closed.

  The inscribed circle of the connection portion 3a of the female connection terminal 3 is set to be smaller than the outer diameter of the connection portion 2a of the male connection terminal 2, and the female portion is inserted by inserting the connection portion 2a of the male connection terminal 2. The triangular cross section of the connection portion 3a of the connection terminal 3 is expanded, and the repulsive force (spring force) causes the contact portion 7 between the connection portion 2a of the male connection terminal 2 and the connection portion 3a of the female connection terminal 3 to contact each other. Appropriate force is applied.

  In the female connection terminal 3 of FIG. 4, the contact portion 7 is formed on each of the three flat surfaces inside the connection portion 3 a. In the contact portion 7, in order to improve contactability or pressing force, as shown in FIG. 5 or FIG. 6, the male connection terminal is provided on each inner surface of the connection portion 3a of the female connection terminal 3. It is preferable to have one or a plurality (two in the illustrated example of FIG. 6) of convex portions 8 or 8a, 8b in contact with the outer peripheral surface of the two.

  In FIG. 5, one convex portion 8 that contacts the outer peripheral surface of the male connection terminal 2 is provided on each inner surface of the connection portion 3 a of the female connection terminal 3. In FIG. 6, the connection of the female connection terminal 3 is performed. Two convex portions 8a and 8b that are in contact with the outer peripheral surface of the male connection terminal 2 are provided on each inner surface of the portion 3a. In addition, it is preferable that these convex parts 8 or 8a, 8b are continuously formed long in the axial direction (perpendicular to the paper surface) in order to secure a contact area. The convex portion 8 or 8a, 8b is preferably convex or curved.

  According to the electrical connection terminal 1 configured as described above, the inscribed circle of the connection portion 3a having a triangular cross section of the female connection terminal 3 is smaller in diameter than the outer diameter of the connection portion 2a of the male connection terminal 2 having a circular cross section. As a result, when the connection part 2a of the male connection terminal 2 is inserted into the connection part 3a of the female connection terminal 3, the connection part 3a having a triangular cross section is pushed and spreads to generate a spring force (repulsive force). The connecting portion 3a having a triangular cross section is mechanically pressed against the outer surface (outer peripheral surface) of the connecting portion 2a of the male connection terminal 2 by the spring force, thereby ensuring an electrically stable contact.

  In addition, since the connection portion 3a having a triangular cross section is used, a plurality of (three) connection points (contact points) are formed where the outer peripheral surface of the connection portion 2a of the male connection terminal 2 having a circular cross section and the connection portion 3a having a cross sectional shape contact. As a result, the contact resistance is kept low and a large number of current paths are secured to keep the current density low. As a result, a large current can flow. Moreover, since the connection portion 3a of the female connection terminal 3 has one or a plurality of convex portions 8 or 8a, 8b in contact with the outer peripheral surface of the male connection terminal 2 on each inner surface, The contact property of the portion 7 can be improved, and the current density of each contact portion 7 can be further reduced to reduce the amount of heat generated due to contact resistance and current concentration. Therefore, it is possible to provide a small electrical connection terminal that has a simple structure and can handle a large current.

  In particular, the male connection terminal 2 can be easily formed by rounding a metal plate (metal plate) or using a metal round bar, and the female connection terminal 3 is made of a metal plate. By bending the (metal plate), it can be easily formed, the productivity is good, the productivity is improved, and the cost is reduced. Further, as shown in FIG. 3, if all three ends (three corners) of the connection section 3a are closed (closed loop structure), when the male connection terminal 2 having a circular section is inserted, the male connection terminal 2 is inserted. It becomes possible to apply a pressing force evenly to the connection portion 2a of the mold connection terminal 2 by means of three surfaces having a triangular cross section.

  FIG. 7 is a cross-sectional view showing an example in which a spring auxiliary member is provided on the outer periphery of the connection portion of the female connection terminal. In the embodiment of FIG. 7, a spring assist with a triangular cross section having a cut (open end) 10 at one corner also on the outer periphery of the connection section 3 a having a cross section (open end) 6 at one corner. The member 9 is fitted. The spring auxiliary member 9 is formed in a similar shape that is slightly larger than the connection portion 3a, and is fitted and attached to the outer periphery of the connection portion 3a. The material of the spring auxiliary member 9 is preferably stainless steel, iron, copper alloy or the like having excellent spring properties.

  In particular, the cut 6 of the connecting portion 3 a and the cut 10 of the spring auxiliary member 9 are arranged at different positions, and the cut 6 of the connecting portion 3 a is closed by the corner portion 11 of the spring auxiliary member 9. Thereby, the spring force of the female terminal member 3 can be reinforced, the pressing force can be generated evenly on the three surfaces of the female terminal member 3, and the connecting portion can be compared with the female terminal member 3 of FIG. There is an effect that it is not necessary to perform the step of closing the cut (open end) 6 of 3a by welding and brazing.

  FIG. 8 is a cross-sectional view showing an example in which the cross-sectional shape of the connection portion of the female connection terminal is a polygon. The cross-sectional shape of the connection portion 3a of the female connection terminal 3 is preferably a triangular cross-section, but may be a polygonal cross-section. FIG. 8 shows an example in which the connection portion 3a is formed in a hexagonal cross-section. . Thus, even if the connection part 3a of the female connection terminal 3 is formed in a polygonal cross section, the same effect as that of the fourth embodiment can be obtained. Moreover, you may provide the spring auxiliary | assistant member of a cross-sectional polygon on the outer periphery of a connection part similarly to embodiment of FIG.

  As mentioned above, although embodiment thru | or example of this invention has been explained in full detail with drawing, this invention is not limited to the said embodiment thru | or example, Various in the range which does not deviate from the summary of this invention. Design changes are possible.

It is a perspective view which shows roughly the electrical connection terminal which is embodiment of this invention. It is sectional drawing which shows the connection part which has the cut | interruption of a female connection terminal. It is sectional drawing which shows the connection part which does not have the cut | interruption of a female type | mold connection terminal. It is sectional drawing which shows the contact point shape with the male connection terminal in the connection part of a female connection terminal. It is sectional drawing which shows the contact point shape with the male connection terminal in the connection part of a female connection terminal. It is sectional drawing which shows the contact point shape with the male connection terminal in the connection part of a female connection terminal. It is sectional drawing which shows the example which provided the spring auxiliary member in the outer periphery of the connection part of a female connection terminal. It is sectional drawing which shows the example which made the cross-sectional shape of the connection part of a female connection terminal into a polygon. It is a perspective view which shows an example of the conventional electrical connection terminal.

DESCRIPTION OF SYMBOLS 1 Electrical connection terminal 2 Male connection terminal 2a Connection part 2b Taper part 3 Female connection terminal 3a Connection part 4 Cable conductor connection part 5 Cable conductor connection part 6 Cut 7 Contact part 8 Convex part 8a, 8b Convex part 9 Spring auxiliary member 10 cuts 11 corners

Claims (1)

In an electrical connection terminal comprising a male connection terminal having a circular connection section and a female connection terminal into which the male connection terminal is fitted,
Upper Kimesu connecting terminal is a cross-sectional triangle of the tubular so as to have three surfaces that Sessu the outer peripheral surface of the male connecting terminal has a connecting portion having a slit on one corner ,
On the outer periphery of the connecting portion, a spring auxiliary member having a triangular cross section having a cut at one corner and similar to the connecting portion is fitted, and the cut of the connecting portion and the cut of the spring auxiliary member are formed. Arranged in different positions, and
It is set so that the inscribed circle of the connection part of the triangular connection section of the female connection terminal has a smaller diameter than the outer diameter of the connection part of the circular connection section of the male connection terminal,
The electrical connection terminal, wherein the connection portion of the male connection terminal is inserted into the connection portion of the female connection terminal, whereby the connection portion having a triangular cross section of the female connection terminal is expanded .

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