JP6168923B2 - Wire harness connection structure and connection method - Google Patents

Description

  The present invention relates to a connection structure and a connection method for a wire harness in which two or more electric wires are connected by a joint terminal.

  Copper wires with good conductivity are used for wire harnesses for connecting various devices in automobiles and the like. On the other hand, in light of environmental problems in recent years, the automobile industry has been developing technology for reducing weight for the purpose of improving fuel efficiency, and is considering the use of aluminum wires that are lighter in weight than copper wires. Although this aluminum electric wire is inferior in conductivity as compared with a copper electric wire, even if the cross-sectional area is made larger than that of the copper electric wire, the weight of the entire wire harness can be reduced.

  2. Description of the Related Art Conventionally, a technique is known in which a connector terminal for mounting in a connector housing is compressed (crimped) and attached to a core portion of one aluminum electric wire. Since aluminum is easily oxidized, an oxide film is easily formed on each surface of a plurality of aluminum strands constituting the aluminum core wire. Since this oxide film is dense and highly insulating, the conductivity of the aluminum core wire is lowered. Therefore, in the compression work of this aluminum electric wire, it is necessary to compress it with a larger compression ratio than that of the copper electric wire in order to destroy and adhere this oxide film. On the other hand, since the mechanical tensile strength of aluminum wires is lower than that of copper wires, if the wire is compressed at a large compression rate, the aluminum wires may break (crush), and the holding strength of the terminals against the aluminum wires will decrease. There is a fear. Therefore, a holding barrel and a conduction barrel are provided on the above-described terminals, respectively, and the holding barrel is compressed at a compression rate that is not unreasonable in mechanical strength to hold the wire harness, and the conduction barrel is compressed at a large compression rate. Thus, the oxide film is destroyed and brought into close contact (see, for example, Patent Document 1).

JP-A-2005-50736

  In the connection of the wire harness, the ends of the plurality of electric wires are connected together by joint terminals. Therefore, when an aluminum electric wire is adopted as the wire harness, the aluminum electric wire and the copper electric wire are connected in a mixed manner. The compression rate of the joint terminal at this time is that it is compressed with a large compression rate according to the aluminum electric wire because the oxide film of the aluminum electric wire cannot be broken and adhered when compressed with the optimal compression rate for the copper electric wire. . However, when the compression ratio is large, the wire of the electric wire (particularly, the wire of the electric wire having a low tensile strength) may be broken, and it may not be possible to ensure good electrical continuity with all the electric wires.

  Moreover, even if it is a mode (for example, a mode in which only a plurality of copper wires are connected together by a joint terminal) in which aluminum wires and copper wires are not mixed, copper wires having different cross-sectional areas are connected by joint terminals. In some cases, it is necessary to compress at a large compression ratio that matches the larger cross-sectional area. Even in this case, since the tensile strength of the copper wire having a small cross-sectional area is small, the strands may be broken, and good electrical continuity may not be ensured with all of the plurality of wires.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a wire harness connection structure and a wire harness connection method capable of ensuring good conduction when connecting a plurality of electric wires. Is to provide.

In order to solve the above-mentioned problem, the connection structure of the wire harness of the present invention is for connecting two or more electric wires having different tensile strengths of the core wires with joint terminals, and the core wires of the two or more electric wires are connected to each other. the cover together with the joint terminal, the joint terminal, the is compressed by increasing the compression ratio toward the tip end from the base end side of the joint terminal extending along the core wire, two or more The length of the core wire of the electric wire is made different, and only the long core wire is compressed on the tip side.

  Further, the joint terminal may be formed with two or more compressed portions compressed in multiple stages.

  More specifically, the core wire of one of the electric wires is an aluminum electric wire, the core wire of the other one electric wire is a copper electric wire, and the length of either the copper electric wire or the aluminum electric wire is You may make it form longer than either the said aluminum electric wire or the said copper electric wire, and compress only the said copper electric wire or the said aluminum electric wire by the said front-end | tip part side.

  Moreover, you may form the sealing part compressed in the aspect which seals the edge part by the side of the said front-end | tip part of the said joint terminal.

  Further, a taper shape may be formed from the base end side to the tip end side of the joint terminal, and the compression rate may be varied in proportion to the length from the base end side to the tip end side. Further, a taper is formed between the compressed portion on the base end side of the joint terminal and the adjacent compressed portion on the distal end side, and the compression rate is different in proportion to the distance between the adjacent compressed portions. It may be allowed. Furthermore, the compression rate may be made different by forming the compression portion on the proximal end side of the joint terminal and the adjacent compression portion on the distal end side in a step shape.

  The base end side of the joint terminal may be formed in a bell mouth shape. Further, in the compression step, ribs protruding in the compression direction can be formed on the joint terminal. Moreover, you may form by compressing the said compression part by the side of the front-end | tip part of the said joint terminal with a compression rate smaller than the said compression part by the side of a base end part. Furthermore, the joint terminal can be compressed so that the cross-sectional shape after compression becomes a circular shape, an elliptical shape, or a polygonal shape.

On the other hand, the wire harness connection method of the present invention is a wire harness connection structure for connecting two or more electric wires having different tensile strengths of the core wires with joint terminals, and the core wires of the two or more electric wires are connected. Covering together with the joint terminal, the joint terminal, the compression portion on the distal end side of the joint terminal is compressed at a compression rate smaller than the compression portion on the proximal end side , the joint terminal Two or more compressed portions compressed in multiple stages are formed, the lengths of the core wires of the two or more electric wires are made different, and only the long core wires are compressed on the tip side. And

The joint terminal may be compressed in multiple stages.
Furthermore, compression with different compression rates or compression with the same compression rate can be performed in a single compression step.

  In the wire harness connection structure and the wire harness connection method according to the present invention, the core wires of two or more electric wires are covered together with the joint terminals, and the joint terminals extend along the core wires. Since the compression rate is increased and compressed from the base end side of the terminal toward the distal end side, it is not necessary to compress only with a large compression rate according to the compression rate of one of the two or more. Problems such as wire breakage caused by a large compression ratio can be prevented. Moreover, since each core wire can be compressed at a different optimum compression rate, any core wire can be uniformly compressed at the optimum compression rate at any position in the longitudinal direction. Therefore, good electrical conduction can be ensured.

  In addition, since the compression is performed by increasing the compression rate in multiple steps from the proximal end side to the distal end side of the joint terminal, the compression rate stage is compared with the case of compressing at one large compression rate. Change can be made small and it is possible to make it difficult to break the strands. Therefore, good electrical continuity can be ensured.

It is a connection structure of the wire harness which concerns on embodiment of this invention, Comprising: It is a schematic diagram which shows the state which changed the compression rate stepwise from the base end part side toward the front end part side. It is AA sectional drawing of FIG. (A) shows the determination method of the optimal compression rate when compressing in one step, and (B) is a graph showing the determination method of the optimal compression rate when compressing in three steps. It is a schematic diagram which shows the state which provided the taper part and the level | step-difference part between the adjacent compression parts. It is a schematic diagram which shows the state which changed the compression rate from taper shape toward the front-end | tip part side from the base end part side. It is a schematic diagram which shows the state which formed the copper electric wire longer than the aluminum electric wire and compressed only the copper electric wire by the front-end | tip part side. It is a schematic diagram which shows the state which compressed the edge part by the side of the front-end | tip part of a joint terminal in the bag shape. It is a schematic diagram which shows the state which provided the bell mouth in the joint terminal. It is a schematic diagram which shows the state which formed the rib in the joint terminal after compression. It is the figure seen from the B direction of FIG. It is a schematic diagram which shows what provided the 4th compression part with a small compression rate in the front-end | tip part of a joint terminal.

Hereinafter, a wire harness connection structure 1, 40, 50, 60, 70, 80, 90 and a wire harness connection method according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing a state in which the compression rate is changed stepwise from the base end side toward the tip end side, and FIG. 2 is a cross-sectional view taken along line AA in FIG.
In addition, the longitudinal direction (extending direction) of the electric wires 10 and 20 and the joint terminal 30 used in the following description refers to the right and left direction in FIG. 1, and the proximal end portion 31A of the joint terminal is the same as FIG. The left direction of the paper surface and the tip end side 31B refer to the right direction of the paper surface of FIG.
In addition, “compression” used in the present specification means that the strands constituting the core wires 11 and 21 are brought into close contact with each other so that an equal pressure is applied thereto.

As shown in FIG. 1, the copper electric wire 10 is one in which a copper core wire 11 is covered with an insulating coating, and the aluminum electric wire 20 is configured by covering an aluminum core wire 21 with an insulating coating. These electric wires 10 and 20 are connected such that the copper core wire 11 and the aluminum core wire 21 are bundled at the ends and the outer periphery thereof is covered together with the joint terminal 30. The joint terminal 30 is formed in a cylindrical shape, and is assembled in such a manner that the copper core wire 11 and the aluminum core wire 21 are inserted into the hollow interior.
In addition, the shape of the joint terminal 30 is not limited to a cylindrical shape, and may be a U-shaped cross section in which a slit is inserted in the longitudinal direction so that the compression work can be easily performed. Moreover, you may be a plate-shaped thing wound along the outer periphery of the bundled core wire part.

  The joint terminal 30 has a longitudinal direction along the direction in which the copper electric wire 10 and the aluminum electric wire 20 extend, and the copper core wire 11 and the aluminum core wire 21 are inserted from the proximal end portion side 31 </ b> A of the joint terminal 30. In addition, the inserted copper core wire 11 and the aluminum core wire 21 are arranged on the distal end side 31 </ b> B of the joint terminal 30.

  From this state, the side part 33 of the joint terminal 30 is pressed with a compression jig, and the copper core wire 11 and the aluminum core wire 21 are compressed. As shown in FIG. 1, the side surface portion 33 of the joint terminal 30 is compressed stepwise (three steps in FIG. 1) at different compression rates in the longitudinal direction. Accordingly, the first compressed portion 33A, the second compressed portion 33B, and the third compressed portion 33C are formed on the side surface portion 33 after compression in order from the proximal end portion 31A.

  In addition, the compression part mentioned above is not limited to three, Two may be sufficient. Further, the compressed portion may be formed by subdividing into four or more. Moreover, it is not necessary for the plurality of compressed portions to have different compression rates, and some (not all) of the plurality of compressed portions may be compressed at the same compression rate.

  The first compression portion 33A, the second compression portion 33B, and the third compression portion 33C have the smallest compression ratio of the first compression portion 33A on the base end side, and the compression ratio of the second compression portion 33B is the first compression portion. Stepwise as it goes from the base end side 31A to the tip end side 31B so that the compression rate of the third compression portion 33C is larger than the compression rate of the portion, and further the compression rate of the second compression portion 33B. The compression rate is increased.

Here, the optimum compression rate will be described with reference to the graphs of FIGS. 3 (A) and 3 (B). These graphs show the relationship between the electrical conductivity of the connecting portion and the tensile strength with respect to the compressibility, the curve R shows the tensile strength, and the curve S shows the electrical conductivity of the connecting portion.
As shown in FIGS. 3A and 3B, the optimum values of the conductivity and tensile strength (peak values of the curves R and S) of the connecting portion are generated at different compression rates. More specifically, the optimum value of the tensile strength (the peak value of the curve R) is generated with a smaller compressibility than the optimum value of the conductivity of the connecting portion (the peak value of the curve S). Therefore, when connecting by one compression (as shown in FIG. 3A), it is not preferable to match one peak value because it greatly deviates from the other peak value. Therefore, it is desirable to connect at a compression rate in the range T1, which is the compression rate at which these two values are the highest. However, even if the compression rate is within this range T1, both values deviate from the peak value, which is not an optimal state.

  On the other hand, when compression is performed in multiple stages as in the present invention (shown in FIG. 3B), compression is performed in three stages of ranges T2, T3, and T4, so that connections are made at optimum compression rates. become able to. More specifically, compression is performed at an optimal compression ratio at which the tensile strength reaches a peak value in the range T2, compression is performed at a compression ratio at which the two values are the highest in the range T3, and the conductivity of the connection portion is increased in the range T4. By compressing at the optimal compression ratio that will be the peak value, it will be possible to connect with the highest value of the conductivity of the connection part while securing the highest tensile strength. .

The aluminum core wire 21 needs to be compressed at a higher compression rate than the copper core wire 11. When this large compressibility is applied, since aluminum is softer than copper, the strands of the aluminum core wire 21 are first crushed.
Also, a high compression rate is required to electrically connect (conduct) the strands. On the other hand, when the compressibility is increased, the cross-sectional area of the strand is reduced, and the strength is reduced.
In other words, the optimum compression ratio is different from the optimum compression ratio between the tensile strength and the conductivity of the connection portion. Therefore, by performing multi-stage compression, it is possible to prevent wire breakage by securing an optimal compressibility of tensile strength and electrical conductivity of the connecting portion at any position from the proximal end portion 31A to the distal end portion side 31B. To ensure good electrical continuity.

  The cross-sectional shape after compressing the first compression portion 33A, the second compression portion 33B, and the third compression portion 33C is substantially hexagonal as shown in FIGS. The cross-sectional shape can be various shapes such as a perfect circle shape, an elliptical shape, or a polygonal shape, but it can be compressed almost uniformly in the normal direction of the connection joint 30, so that it has a hexagonal shape or a circular shape. It is preferable to do this.

The step of compressing each of the first compression portion 33A, the second compression portion 33B, and the third compression portion 33C is performed by performing the compression portions 33A, 33B, and 33C in a single compression step. A compression jig (not shown) for performing this compression is composed of, for example, an upper mold and a lower mold integrally having shapes corresponding to the three portions 33A, 33B, and 33C. Is pressed from above and below the joint terminal 30 to perform compression once.
Further, this compression step may be performed in two or more compression steps instead of once. In addition, the upper mold and the lower mold may be divided types that are divided for each of the compression portions 33A, 33B, and 33C so that the compression ratio of each portion can be individually adjusted.

On the other hand, as the method and structure for connecting the copper core wire 11 and the aluminum core wire 21 using the joint terminal 30, various forms are conceivable. Hereinafter, it demonstrates in detail using FIGS. 4-11.
FIG. 4 is a view corresponding to FIG. 1 and shows a wire harness connection structure 40 in which a tapered portion 41 and a stepped portion 42 are provided between adjacent compressed portions.

  A tapered portion 41 can be provided between the first compression portion 33A and the second compression portion 33B as shown in FIG. The tapered portion 41 is inclined in a tapered shape so that the diameter of the joint terminal 30 after compression becomes smaller (so that the compression ratio becomes larger) from the proximal end portion 31A toward the distal end portion 31B. By providing the taper portion 41 in this way, the compression rate is gradually increased from the first compression portion 33A to the second compression portion at the X portion in FIG. 4 so as to prevent the wire breakage due to a sudden change in the compression rate. I have to.

  In addition, a step 42 can be provided between the second compressed portion 33B and the third compressed portion 33C as shown in FIG. The step portion 42 is shaped to enter inward from the second compression portion 33B so as to have an edge that is substantially perpendicular to the normal direction, and bites into the strand like serration. As a result, a larger contact area between the joint terminal 30 and the element wire is secured at the Y portion in FIG. 4 to improve electrical continuity.

  It is possible to appropriately select which of the tapered portion 41 and the stepped portion 42 is provided depending on the position of the joint terminal 30 in the longitudinal direction. That is, since the taper part 41 mentioned above is close to the base end part side 31A, it is provided with an emphasis on preventing strand breakage. On the other hand, since the step portion 42 is close to the distal end portion side 31B, it is provided with an emphasis on electrical continuity due to good contact. As described above, these may be appropriately selected according to the purpose.

FIG. 5 is a view corresponding to FIG. 1 and shows a wire harness connection structure 50 compressed in a tapered shape from the proximal end portion 31A toward the distal end portion 31B.
Instead of compressing stepwise like the above-mentioned 1st compression part 33A, 2nd compression part 33B, and 3rd compression part 33C in the side part 33 of the joint terminal 30, as shown in FIG. A tapered portion 51 that is inclined from the side 31A to the tip end side 31B is provided. The tapered portion 51 is inclined in a tapered shape so that the diameter of the joint terminal 30 after compression becomes smaller (so that the compression rate becomes larger) from the proximal end portion 31A toward the distal end portion 31B. By providing the tapered portion 51 in this way, the compression rate can be gradually increased in proportion to the length from the proximal end side 31A to the distal end side 31B of the joint terminal 30, and a sudden change in the compression rate is achieved. It is trying to prevent wire breakage due to.

FIG. 6 is a view corresponding to FIG. 1 and shows a wire harness connection structure 60 in which the copper core wire 11 is formed longer than the aluminum core wire 21 and only the copper core wire 11 is compressed on the tip end side 31B. .
In the connection structure 60 shown in FIG. 6, when the electric wires 10 and 20 are bundled, the copper core wire 11 is arranged in the vicinity of the center thereof, and the aluminum core wire 21 is arranged outside the copper core wire 11. . The length of the tip end side 31 </ b> B of the copper core wire 11 is longer than the length of the aluminum core wire 21. From this state, the joint terminal 30 is compressed stepwise from the base end side 31A as described above, and finally, a fourth compression portion 33D for compressing only the copper core wire 11 is provided (FIG. 6). R part). Thus, by compressing only the copper core wire 11 at the tip end side 31 </ b> B, it is possible to compress only the copper core wire 11 by applying an optimal compression ratio regardless of the presence or absence of the aluminum core wire 21.

  In addition, in the structure mentioned above, although the copper core wire 11 is collectively arranged near the center, you may arrange | position the copper core wire 11 and the aluminum core wire 21 in reverse. Moreover, you may make it compress only the copper core wire 11 (or aluminum core wire 21) by the 3rd compression part 33C, without providing the 4th compression part 33D.

FIG. 7 is a view corresponding to FIG. 1 and shows a wire harness connection structure 70 in which the end portion 31B end portion of the joint terminal 30 is compressed into a bag shape.
In the structure of FIG. 7, the copper core wire 11 and the aluminum core wire 21 are not inserted into the end portion 31B end of the joint terminal 30, and the sealed portion 71 is formed by crushing and bending joining or caulking to this portion. Is provided. The sealing portion 71 has a structure that prevents water from entering the joint terminal 30 after being compressed by being completely crushed. Thus, by ensuring the airtightness (watertightness) of the airtight portion 71 in the Z portion, the connecting portion can be made waterproof.

FIG. 8 is a view corresponding to FIG. 1 and shows a wire harness connection structure 80 in which a bell mouth 81 is provided on the joint terminal 30. FIG. 8 shows a state in which the copper core wire 11 and the aluminum core wire 21 are passed through the joint terminal 30 before the joint terminal 30 is compressed.
As shown in FIG. 8, a bell mouth 81 is provided on the base end portion side 31 </ b> A of the joint terminal 30 in such a manner that the end of the opening expands in a trumpet shape.

  The joint terminal 30 is inserted from the proximal end portion 31 </ b> A of the joint terminal 30 in a state where the copper core wire 11 and the aluminum core wire 21 are bundled. By providing a bell mouth on the proximal end portion 31 </ b> A of the joint terminal 30, this insertion operation can be performed easily and damage during insertion of the copper core wire 11 and the aluminum core wire 21 can be prevented.

  Further, the bell mouth 81 may be formed by the compression force at the time of compression. By forming the bell mouth 81 during compression in this way, even if the proximal end portion side 31A of the joint terminal 30 is compressed, the diameter of the opening portion on the proximal end portion side 31A does not become small. , The damage acting on the covering portion of 20 can be reduced.

  FIG. 9 is a view corresponding to FIG. 1 and shows a wire harness connection structure 90 in which ribs 91A, 91B, and 91C are formed on the joint terminal 30 after compression. FIG. 10 is a view seen from the B direction of FIG.

  When the copper core wire 11 and the aluminum core wire 21 are inserted into the joint terminal 30 and then compressed in stages, the side surface portion 33 of the joint terminal 30 is deformed by this compressive force. A plurality of ribs 91 </ b> A, 91 </ b> B, 91 </ b> C are formed on the side surface portion 33 using the strain of the joint terminal 30 due to the deformation at the time of compression (strain due to the flow of metal at the time of compression).

  As shown in FIG. 9, these ribs 91 </ b> A, 91 </ b> B, 91 </ b> C are formed so as to protrude in a direction orthogonal to the longitudinal direction of the joint terminal 30 (normal direction of the joint terminal 30). Further, as shown in FIG. 10, the ribs 91A, 91B, and 91C are continuously formed in a substantially hexagonal shape along the outer circumferences of the first compression portion 33A, the second compression portion 33B, and the third compression portion 33C. ing.

  These ribs 91A, 91B, 91C improve the strength of the joint terminal 30 and have a function of relieving stress acting on the respective compression portions 33A, 33B, 33C. Further, since these ribs 91A, 91B, 91C are formed by utilizing the compression force at the time of compression, the ribs 91A, 91B, 91C are more easily compared with the case where ribs are separately provided after compression. Can be provided.

FIG. 11 is a diagram corresponding to FIG. 1, and shows a wire harness connection structure 100 in which a fourth compression portion 103 </ b> D having a small compression rate is provided at the tip portion 31 </ b> B of the joint terminal 30.
A fourth compression portion 103D having a smaller compression rate than the third compression portion 33C is provided on the tip end side 31B from the third compression portion 33C. More specifically, the outer diameter of the fourth compression portion 103D is formed to be larger than the outer diameter of the third compression portion 33C, as shown in FIG. 11, and the third compression portion 33C forms a constricted structure. I have to.

  In this way, the fourth compression portion 103D on the distal end side 31B is compressed and formed at a compression rate smaller than that of the third compression portion 33C on the proximal end portion 31A, whereby a tensile force acts on the electric wires 10 and 20. Even if it does, it can make it difficult for the electric wires 10 and 20 after compression to come off from the base end part side 31A of the joint terminal 30. That is, as shown in FIG. 1, when the connection joint 30 has a structure in which the compression rate is increased stepwise from the proximal end portion 31A toward the distal end portion 31B, the proximal end mold 31A to the electric wire 10 , 20 does not have a structural thing to prevent the drop-off, and only the compressive force resists the above-described tensile force. On the other hand, in the connection structure 100 of FIG. 11, the copper core wire 11 and the aluminum core wire 21 that are compressed and accommodated in the fourth compression portion 103D are physically hooked by the constriction structure of the third compression portion 33C. It is possible to structurally prevent the pulling-down due to the tensile force.

  Note that the fourth compression portion 103D may be, for example, the one in which the side surface portion 33 is left uncompressed (compression rate is 0) as long as it is smaller than the compression rate of the third compression portion 33C. Absent.

  According to the wire harness connection structure 1 and the connection method thereof according to the embodiment of the present invention, the copper core wire 11 and the aluminum core wire 21 of the two or more electric wires 10 and 20 are covered together by the joint terminal 30, and the copper core wire 11 and Since the compression rate is increased as it goes from the proximal end side 31A of the joint terminal 30 extending along the aluminum core wire 21 to the distal end side 31B, the compression rate is adjusted to one of the two or more. Therefore, it is not necessary to perform compression only with a large compression ratio, and problems such as wire breakage caused by the large compression ratio can be prevented. In addition, since the copper core wire 11 and the aluminum core wire 21 can be compressed at different optimal compression rates, the copper core wire 11 and the aluminum core wire 21 can be uniformly distributed at the optimal compression rate at any position in the longitudinal direction. Can be compressed. Therefore, good electrical conduction can be ensured. Further, since the compression rate is increased and compressed from the base end side 31A toward the tip end side 31B, the copper core wire 11 and the aluminum core wire 21 on the base end side 31A are not subjected to a large compression rate. Cutting can be prevented.

  In addition, since the joint terminal 30 is formed with compression portions 33A, 33B, and 33C that are compressed in multiple stages, compared with the case where the compression is performed with one large compression ratio, a gradual change in the compression ratio is achieved. It can be made small, and it can be made difficult to break the strands. Therefore, good electrical continuity can be ensured.

  Moreover, the compression work can be efficiently performed in a short time by performing compression with different compression ratios or compression with the same compression ratio in one compression step. In addition, compression with different compression ratios or compression with the same compression ratio can be performed in two or more compression steps, so that the compression ratios of the respective compression portions 33A, 33B, and 33C can be reliably managed. become.

  According to the wire harness connection structure 60 and the connection method thereof according to the embodiment of the present invention, the lengths of the copper core wire 11 and the aluminum core wire 21 of the two or more electric wires 10 and 20 are made different, and the copper core wire 11 or the aluminum core wire. Since only the long formed electric wire 21 is compressed at the tip end side 31B, only one of the long formed copper core wire 11 or aluminum core wire 21 can be compressed alone. Therefore, only the copper core wire 11 or the aluminum core wire 21 can be compressed with an optimal compression rate.

  According to the wire harness connection structure 70 and the connection method thereof according to the embodiment of the present invention, since the sealing portion 71 compressed in such a manner as to seal the end portion 31B of the joint terminal 30 is provided, this sealing is performed. It is possible to prevent water from entering from the portion 71 and to make the connection portion in the joint terminal 30 waterproof.

  According to the wire harness connection structure 50 and the connection method thereof according to the embodiment of the present invention, a portion from the proximal end portion 31A to the distal end portion 31B of the joint terminal 30 is formed in a tapered shape, and the proximal end portion 31A is formed. Since the compression rate is gradually increased in proportion to the length from the tip side 31B to the tip end side 31B, it is possible to prevent the wire breakage due to a sudden change in the compression rate.

  According to the wire harness connection structure 40 and the connection method thereof according to the embodiment of the present invention, a taper is formed between the compressed portion 33A on the proximal end portion 31A side of the joint terminal 30 and the adjacent compressed portion 33B on the distal end portion side 31B. Since the compression rate is gradually increased in proportion to the distance between the adjacent compression portions 33A and 33B, the compression rate is gradually increased from the first compression portion 33A to the second compression portion. It is possible to prevent wire breakage due to a sudden change in compression rate.

  In addition, since the compression portion 33B on the proximal end side 31A of the joint terminal 30 and the adjacent compression portion 33C on the distal end side 31B are formed in a stepped shape, the contact area between the joint terminal 30 and the strand is increased. , Electrical continuity can be improved.

  According to the wire harness connection structure 80 and the connection method thereof according to the embodiment of the present invention, since the proximal end portion 31A of the joint terminal 30 is formed in a bell mouth shape, the proximal end portion 31A of the joint terminal 30 is formed. Is compressed, the diameter of the opening on the base end side 31 </ b> A does not become small, so that damage acting on the covered portions of the electric wires 10 and 20 can be reduced.

  According to the wire harness connection structure 90 and the connection method thereof according to the embodiment of the present invention, since the ribs 91A, 91B, and 91C protruding in the compression direction are formed on the joint terminal 30, the strength of the joint terminal 30 is improved. Thus, the stress acting on the respective compressed portions 33A, 33B, and 33C can be relaxed. In addition, since these ribs 91A, 91B, 91C are formed by utilizing the compression force at the time of compression, the ribs 91A, 91B, 91B can be more easily compared with the case where ribs are provided later after compression. 91C can be provided.

  Moreover, since the cross-sectional shape after compression of the joint terminal 30 is compressed to be a hexagonal shape, it can be compressed uniformly in the normal direction.

  According to the wire harness connection structure 100 and the connection method thereof according to the embodiment of the present invention, the fourth compression portion 103D on the distal end side 31B of the joint terminal 30 is made to be more than the third compression portion 33C on the proximal end portion 31A. Since it is formed by compressing at a small compression rate, the copper core wire 11 and the aluminum core wire 21 compressed and accommodated in the fourth compression portion 103D are third compressed even if a tensile force acts on the electric wires 10 and 20. The portion 33C is physically hooked by the constriction structure. Therefore, it is possible to structurally prevent the electric wires 10 and 20 from coming off the joint terminal 30 due to the tensile force described above.

  The wire harness connection structure 1, 40, 50, 60, 70, 80, 90 and the connection method thereof according to the embodiment of the present invention have been described above, but the present invention is not limited to the above-described embodiment. However, various modifications and changes can be made based on the technical idea of the present invention.

  For example, in this Embodiment, although the some electric wire 10 and 20 connected with the joint terminal 30 demonstrated as an example what mixed the copper core wire 11 and the aluminum core wire 21, it is not limited to this. For example, the present invention can also be applied to the case of connecting a plurality of aluminum electric wires or a plurality of copper electric wires. More specifically, when connecting electric wires having different cross-sectional areas (having different tensile strengths of the core wires), the optimal compression ratio of the electric wires is different. As in the case of the connection of the core wires 21, the problems coincide with each other in that the optimum compression ratios are different. Therefore, as in this embodiment, by changing the compression rate stepwise, a large breaking force does not act on the strands as compared with the case of compressing at a large compression rate at a time. As a result, problems such as wire breakage can be solved and better electrical continuity can be ensured.

1, 40, 50, 60, 70, 80, 90, 100 Wire harness connection structure 10 Copper wire (electric wire)
20 Aluminum wire (electric wire)
DESCRIPTION OF SYMBOLS 11 Copper core wire 21 Aluminum core wire 30 Joint terminal 31A Base end side 31B Front end side 33 Side surface part 33A 1st compression part 33B 2nd compression part 33C 3rd compression part 41 Tapered part 42 Step part 51 Tapered part 71 Sealing part 81 Bell Mouse 91A, 91B, 91C Rib 103D 4th compression part X Taper part Y Step part Z Sealing part

Claims (14)

A wire harness connection structure for connecting two or more electric wires having different tensile strengths of core wires with joint terminals,
The core of two or more of the wire covering together with the joint terminal, the joint terminal is higher the compression ratio toward the tip end from the base end side of the joint terminal extending along said core wire Compressed ,
The wire harness connection structure, wherein the lengths of the core wires of the two or more electric wires are made different, and only the long core wires are compressed on the tip end side. 2. The wire harness connection structure according to claim 1 , wherein the joint terminal is formed with two or more compressed portions compressed in multiple stages. The core wire of one of the electric wires is an aluminum electric wire, the core wire of the other one electric wire is a copper electric wire, and the length of either the copper electric wire or the aluminum electric wire is set to the aluminum electric wire or the The wire harness connection structure according to claim 1 , wherein the wire harness is formed longer than either one of the copper wires and only the copper wire or the aluminum wire is compressed on the tip side. The wire harness connection structure according to any one of claims 1 to 3 , wherein a hermetically sealed portion is formed in such a manner that the end portion on the tip end side of the joint terminal is hermetically sealed. Claims, characterized in that the between the base end of the joint terminal to the distal end side is formed in a tapered shape, and in proportion to the length from the base end to the distal end side with different compression rate Item 10. A wire harness connection structure according to Item 1 . A taper shape is formed between the compression portion on the base end side of the joint terminal and the adjacent compression portion on the distal end side, and the compression ratio is varied in proportion to the distance between the adjacent compression portions. The wire harness connection structure according to claim 2 , wherein: The wire harness according to claim 2 , wherein the compression rate is made different by forming the compression portion on the proximal end side of the joint terminal and the adjacent compression portion on the distal end side in a step shape. Connection structure. The wire harness connection structure according to any one of claims 1 to 7 , wherein a base end side of the joint terminal is formed in a bell mouth shape. The wire harness connection structure according to any one of claims 1 to 8 , wherein a rib protruding in a compression direction is formed on the joint terminal. A wire harness connection structure for connecting two or more electric wires having different tensile strengths of core wires with joint terminals,
The core of two or more of the wire covering together with the joint terminal, the joint terminal, the compression portion of the front end portion of the joint pin, with a small compression ratio than the compression portion of the base end Compressed ,
The joint terminal is formed with two or more compressed parts compressed in multiple stages,
The wire harness connection structure, wherein the lengths of the core wires of the two or more electric wires are made different, and only the long core wires are compressed on the tip end side. 11. The wire harness connection structure according to claim 1, wherein a cross-sectional shape of the joint terminal after compression is formed into a circular shape, an elliptical shape, or a polygonal shape. A wire harness connection method for connecting two or more electric wires having different tensile strengths of core wires with joint terminals,
The core of two or more of the wire covering together with the joint terminal is compressed by increasing the compression ratio toward the tip end from the base end side of the joint terminal extending along said core wire And
The wire harness connecting method , wherein lengths of the core wires of the two or more electric wires are made different, and only the long core wire is compressed on the tip end side . The wire harness connecting method according to claim 12 , wherein the joint terminal is compressed in multiple stages. The wire harness connecting method according to claim 12 or 13 , wherein the compression with different compression ratios or the compression with the same compression ratio is performed in one compression step.

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