JP5137977B2 - Terminal and conductor-terminal connection - Google Patents

Description

  The present invention relates to a terminal and a conductor-terminal connection body made of a different metal.

In the fields of automobiles, office automation equipment, and home appliances, copper wires having a core wire made of a copper-based material having excellent electrical conductivity have been used as signal lines and power lines. In particular, in the automotive field, the performance of high-performance and high-performance vehicles has been rapidly promoted, so the number of electric wires and control equipment mounted on the vehicle tends to increase. There is the present situation. Under these circumstances, when trying to improve fuel efficiency by reducing the weight of a vehicle, aluminum wires that are lighter and cheaper than copper wires are attracting particular attention in the automotive field.

However, when an aluminum electric wire formed of a core wire made of an aluminum-based material and a terminal made of a copper-based material is used for an automobile, electrolytic corrosion such as dissimilar metal contact corrosion occurs. That is, aluminum is subject to severe corrosion that exceeds conventional electrolytic corrosion in the presence of water and copper ions. In addition to aluminum wires, when wiring work is performed, it is necessary to attach connection terminals to the wires in order to connect wires, connect wires to terminals of external electrical devices, or connect to external electrical devices. There is. Many of these terminals and wires are made of copper having excellent electrical characteristics as described above. For this reason, there are cases where aluminum and copper must be contacted and joined.

Patent Document 1 discloses an aluminum electric wire terminal in which dissimilar metals of aluminum and copper are bonded, and describes that an inflow blocking wall is provided that seals the bonded portion with resin and prevents the resin from flowing. Yes.

JP 2004-111058 A

However, when the resin is placed on the joint and the wire protruding from the joint to bond dissimilar metals, and the resin is cured by irradiating the resin with UV light, the inflow blocking wall and the protruding wire As a result, all of the resin was not irradiated with UV light, and there were places where curing was insufficient. For this reason, incomplete resin molecular bonding occurs, and the resin part is easily cracked, and the resin and the resin contacting the terminal and the electric wire part are easily cracked and peeled off. It was a factor to decrease.

It is possible to select an anaerobic curable UV resin or a thermosetting UV resin that is cured by UV irradiation as the above countermeasure, but when an anaerobic curable resin is used, the resin that has penetrated into a narrow gap between metals. Can cause a curing reaction, but there is a problem that the curing reaction does not occur when the clearance between metals is 0.2 mm or more and the resin is exposed. In addition, when a thermosetting resin that is cured by UV irradiation is used, the thermosetting temperature is set high in consideration of the long-term storage property of the resin, and the curing conditions are generally 100 ° C. or higher and the time for 60 minutes. However, depending on the type of coating material, some materials may be softened at temperatures exceeding 100 ° C., which may degrade the quality of the electric wire. In addition, there is a problem in that the neglect treatment for 60 minutes is not suitable for mass production because of its long tact time.

Accordingly, an object of the present invention is to provide a terminal and a conductor-terminal connection body capable of connecting an electric wire and a terminal made of different metals such as an aluminum electric wire and a copper terminal with high reliability while maintaining electrical characteristics. There is to do.

The terminal aspect of the present invention includes a terminal body formed at one end, a first crimping part formed at the other end, a second crimping part formed between the terminal body and the first crimping part, And a protrusion formed between the terminal main body and the second pressure-bonding portion across the width direction of the terminal and inclined toward the terminal main body. It is characterized by.

Another aspect of the terminal of the present invention is characterized in that the protrusion is formed in an arch shape so as to protrude toward the terminal body side in the width direction of the terminal.

Another aspect of the terminal of the present invention is characterized in that the projection is formed in a wave shape over the width direction of the terminal.

In another aspect of the terminal of the present invention, the inclined surface formed on the second crimping portion side of the protruding portion is subjected to surface processing so that the light reflectance is higher than that of the protruding portion other than the inclined surface. It is characterized by.

The conductor and terminal connection body of the present invention is formed between the terminal body formed at one end, the first crimping part formed at the other end, and the terminal body and the first crimping part. In a terminal having a second crimping portion, a protrusion formed across the width direction of the terminal between the terminal main body and the second crimping portion and inclined toward the terminal main body. A conductor and a terminal connected to each of the first pressure-bonding portion and the second pressure-bonding portion, respectively, and a resin portion disposed so as to cover the conductor portion exposed from the terminal, The adhesive strength between the resin part and the terminal is 3 MPa or more, the elastic modulus of the resin part is 400 MPa or more, and the water absorption is 5% or less.

Another aspect of the conductor-terminal connection body of the present invention is characterized in that the resin portion is a silicon-based, acrylic-based, urethane-based, polyamide-based, or epoxy-based resin.

In another aspect of the conductor-terminal connection body of the present invention, the conductor is made of aluminum or an aluminum alloy, and the terminal is made of copper or a copper alloy.

According to the present invention, when crimping and connecting a dissimilar metal such as an aluminum conductor and a copper terminal, the resin having fluidity does not flow out to the terminal body side by providing a protrusion, and the conductor or terminal has a film thickness. Application can be maintained. In addition, by forming the protrusions with a predetermined inclination, shadows are formed in the vicinity of the protrusions, and the resin cracks and peels due to the uncured effect that occurs when UV light is not irradiated to the entire resin. Can be suppressed. And even if the conductor part of the aluminum conductor is cut off from the outside, for example, when water exposure due to condensation occurs, the water does not come into contact with the aluminum conductor, so that the conductor and the terminal are maintained with stable electrical characteristics. And can be connected.

It is a perspective view which shows embodiment of the connection body of the conductor and terminal which concerns on this invention. It is sectional drawing which shows embodiment of the connection body of the conductor and terminal which concerns on this invention. It is a perspective view which shows 1st embodiment of the terminal which concerns on this invention. It is a perspective view which shows 2nd embodiment of the terminal which concerns on this invention. It is a perspective view which shows 3rd embodiment of the terminal which concerns on this invention. It is a perspective view which shows 4th embodiment of the terminal which concerns on this invention.

A conductor / terminal connection body according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of a conductor-terminal connection body 1, and FIG. 2 is a cross-sectional view taken along line AA of FIG. In addition, about each component which has the same function, the same code | symbol is attached | subjected and shown for simplification of illustration and description.

The conductor-terminal connection body 1 is obtained by crimping and connecting the terminal 10 and the conductor 20, applying the resin 30 to the crimp-connected portion, and then curing the resin 30 using UV light. Here, the material of the terminal 10 may be copper or brass plated with nickel and tin, and the conductor 20 of the conductor 20 may be made of aluminum or aluminum alloy. In addition, various combinations of different metals are possible. The resin 30 may be a silicon-based, acrylic-based, urethane-based, polyamide-based, or epoxy-based resin, or a combination thereof.

The terminal 10 has a terminal main body 2 electrically connected to another connector (not shown) at one end, and a first crimping portion 3 to be crimped and connected to the insulating coating portion 22 of the conductor 20 at the other end. . Further, between the terminal body 2 and the first crimping portion 3, a second crimping portion 4 that is crimped and connected to the conductor portion 21 of the conductor 20 is formed. And between the terminal main body 2 and the 2nd crimping | compression-bonding part 4, while the protrusion part 5 is formed over the width direction of the terminal 10, the protrusion part 5 is formed so that it may incline toward the terminal main body 2 side. Has been.

Further, an inclined surface 5 a whose surface is smoothly processed so as to increase the reflectance of light coming into contact with the resin 30 is formed on the second crimping portion 4 side of the protruding portion 5. By making the surface smooth so that the inclined surface 5a has a higher light reflectivity than the surface of the protrusion 5 other than the inclined surface 5a, the UV light can be efficiently reflected. Buffing or the like can be applied as a method of smoothly processing the surface so that the reflectance of light becomes high, but is not limited to this. Furthermore, the arithmetic average roughness (RA) of the inclined surface 5a is particularly preferably 0.1 μm or less, and by making this value or less, UV light can be efficiently reflected, and the resin 30 having high reliability. Can be cured. The height of the protrusion 5 is preferably set to a height that is at least higher than the conductor portion 21 that is crimp-connected.

In this way, by forming the protruding portion 5 across the width direction of the terminal 10 between the terminal main body 2 and the second crimping portion 4, the resin 30 is the terminal until the resin 30 is applied and cured. Since the protrusions 5 are formed so as to be inclined toward the terminal main body 2 side without flowing out to the main body 2 side, the bottom surfaces of the protrusions 5 and the terminals 10 when the resin 30 is cured with UV light. It is difficult to make shadows in the vicinity, and it becomes possible to suppress cracking and peeling of the cured resin 30 due to the uncured effect caused by the fact that UV light is not irradiated to the entire resin 30, and a highly reliable conductor The terminal connection 1 can be realized. In addition, since the surface is smoothly processed so that the inclined surface 5a has a higher light reflectance than the surface of the protrusion 5 other than the inclined surface 5a, the UV light can be efficiently reflected. Generation | occurrence | production of uncured can be suppressed and it becomes possible to further suppress the crack of the resin 30 after hardening, and peeling.

Next, the terminal 10 will be described with reference to FIGS. FIG. 3 shows a first embodiment of the terminal, before the conductor 20 of FIGS. 1 and 2 is crimped and before the resin 30 is applied.

A terminal body 2 that is electrically connected to another connector (not shown) is formed at one end, and a first crimping portion 3 that is crimped and connected to an insulating coating portion of a conductor (not shown) is formed at the other end. Further, a second crimping portion 4 is formed between the terminal main body 2 and the first crimping portion 3 so as to be crimped and connected to a conductor portion (not shown). And between the terminal main body 2 and the 2nd crimping | compression-bonding part 4, while the protrusion part 5 formed over the width direction of the terminal 10 is formed, the protrusion part 5 inclines toward the terminal main body 2 side. It is formed to do. Further, the protrusion 5 is formed with an inclined surface 5 a whose surface is smoothed so that the reflectance of light is higher than the surface of the protrusion 5 other than the inclined surface 5 a that contacts the resin 30. Since the surface is smoothly processed so that the inclined surface 5a has a higher light reflectance than the surface of the protrusion 5 other than the inclined surface 5a, the UV light can be efficiently reflected.

Thus, by forming the protrusion 5, the resin does not flow out to the terminal body 2 side until the resin is applied and cured, and the protrusion 5 is inclined toward the terminal body 2 side. When the resin is cured with UV light, shadows are hardly formed near the bottom surfaces of the protrusions 5 and the terminals 10, and the uncured effect caused by the UV light not being irradiated on the entire resin. It is possible to suppress the cracking and peeling of the resulting cured resin, and a highly reliable conductor-terminal connection body 1 can be realized. In addition, since the surface is smoothed so that the inclined surface 5a of the protrusion 5 has a higher light reflectivity than the surface of the protrusion 5 other than the inclined surface 5a, the UV light can be efficiently reflected. Therefore, it becomes possible to further suppress the cracking and peeling of the resin after curing.

In addition, the terminal 10 can also form the protrusion part 5 in the assembled terminal by soldering or the like, and after assembling the terminal, while holding and fixing the both side surfaces of the terminal, from the bottom surface side of the terminal It is also possible to form the protrusion 5 by extruding with a processing machine.

A second embodiment of the terminal will be described with reference to FIG. A significant difference from FIG. 3 is that the protruding portion 6 has an arch shape so as to protrude toward the terminal body 2 and is formed to be inclined toward the terminal body 2 side. In this way, when the resin is cured with UV light, shadows are hardly formed on both side surfaces and the bottom surface of the protrusion 6 and the terminal 40, and the UV light is not irradiated on the entire resin. It becomes possible to suppress the cracking and peeling of the cured resin due to the uncured effect, and to realize a highly reliable connection between the conductor and the terminal. Furthermore, the inclined surface 6a that comes into contact with the resin of the protruding portion 6 has a smooth surface so that the reflectance of light is higher than the surface of the protruding portion 6 other than the inclined surface 6a, thereby forming the inclined surface 6a. As a result, UV light can be efficiently reflected, and a more reliable connection between the conductor and the terminal can be realized.

A third embodiment of the terminal will be described with reference to FIG. The point greatly different from FIG. 3 is that the protrusion 7 has a wave shape over the width direction of the terminal 50 and is formed to be inclined toward the terminal body 2 side. By making the wave shape in this way, it is difficult to make shadows on both side surfaces and the bottom surface of the protrusion 7 and the terminal 50, and further, reflection of UV light by the wave shape can be used. It is possible to suppress the cracking and peeling of the cured resin due to the uncured effect that occurs due to the fact that it is not irradiated, and a highly reliable conductor-terminal connection can be realized. Furthermore, the inclined surface 7a in contact with the resin of the protrusion 7 has a smooth surface so that the reflectance of light is higher than the surface of the protrusion 7 other than the inclined surface 7a, so that the inclined surface 7a is formed. As a result, UV light can be efficiently reflected, and a more reliable connection between the conductor and the terminal can be realized.

A fourth embodiment of the terminal will be described with reference to FIG. The major difference from FIG. 3 is that the protrusion 8 is formed integrally with the terminal body 2 and is bent while having a certain inclined angle, and is brought into contact with the bottom surface of the terminal 60. In other words, the protrusion 8 is formed. Further, the protrusion 8 is formed into an arch shape or a wave shape, and the inclined surface 8a of the protrusion 8 is smooth so that the reflectance of light is higher than the surface of the protrusion 8 other than the inclined surface 8a. It can also be processed.

Next, the conductor-terminal connection body 1 when the terminal 10 according to the first embodiment of the present invention is used will be further described in Examples. First, the terminal 10 and the conductor 20 are crimped and connected. Then, after preparing the viscosity of the resin before curing within the range of 5000 mPa · s to 20000 mPa · s, after applying to the conductor portion 21 of the conductor 20, the resin is cured using UV light, and the resin metal after curing The reliability test was performed by changing the adhesive strength to the resin and the elastic modulus and water absorption rate of the cured resin.

The reliability test is allowed to stand for 30 minutes in an environment at an ambient temperature of −40 ° C., and then left for 30 minutes in an environment at an ambient temperature of 120 ° C., and this is repeated 240 times. The transition time from -40 ° C to 120 ° C and the transition time from 120 ° C to -40 ° C are each within 5 minutes. Then, appearances such as peeling and peeling of the resin part before and after the reliability test were observed. A resin part having no peeling and peeling was regarded as acceptable (◯), and a resin part having peeling and peeling was regarded as unacceptable (x).

Table 1 shows that the adhesive strength of the resin after curing, which is a resin condition, and the elastic modulus and water absorption rate of the resin after curing are changed as in the A to H conditions, respectively. The result of observing the appearance of peeling, etc. is shown.

From Table 1, the resin has an adhesive strength to the metal after curing of 3 MPa or more in the range of −40 ° C. to 125 ° C., and the cured resin has an elastic modulus of 400 MPa or more and a water absorption of 5% or less. By doing so, it can be confirmed that the resin part is peeled off and peeled off after the reliability test, and the connection can be made with high reliability. Even if the elastic modulus and water absorption rate are too high or too low, the resin may be peeled off or peeled off when a reliability test is performed due to a difference in coefficient of linear expansion or the like of the terminal 10 or the insulation coating portion 22. .

DESCRIPTION OF SYMBOLS 1 Connection body of electric wire and terminal 10 40 50 60 Terminal 2 Terminal main body 3 1st crimping part 4 2nd crimping part 5 6 7 8 Projection part 20 Conductor 21 Conductor part 22 Insulation coating part 30 Resin

Claims (7)

In a terminal having a terminal body formed at one end, a first crimping part formed at the other end, and a second crimping part formed between the terminal body and the first crimping part,
A protrusion formed between the terminal main body and the second crimping portion in the width direction of the terminal and inclined toward the terminal main body. Terminal.   2. The terminal according to claim 1, wherein the protrusion is formed in an arch shape so as to protrude toward the terminal main body in the width direction of the terminal.   The terminal according to claim 1, wherein the protruding portion is formed in a wave shape across the width direction of the terminal. The inclined surface formed on the second pressure-bonding portion side of the protrusion is surface-treated so that the reflectance of light is higher than that of the protrusion other than the inclined surface. The terminal of any one of -3. In the conductor and terminal connection body in which the insulation covering portion and the conductor portion of the conductor are respectively crimped by the first crimping portion and the second crimping portion of the terminal according to claims 1 to 4,
A resin portion arranged to cover the conductor portion exposed from the terminal;
A conductor-terminal connection body, wherein an adhesive strength between the resin part and the terminal is 3 MPa or more, an elastic modulus of the resin part is 400 MPa or more, and a water absorption is 5% or less.   The conductor-terminal connection body according to claim 5, wherein the resin portion is a silicon-based, acrylic-based, urethane-based, polyamide-based, or epoxy-based resin. The conductor-terminal connection body according to claim 5 or 6, wherein the conductor portion is made of aluminum or an aluminum alloy, and the terminal is made of copper or a copper alloy.

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