JP2016105425A - Wire harness and terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire harness and a terminal, which can obtain excellent contact pressure distribution in a contact surface between conductive wire and a crimping portion.SOLUTION: Coated conductive wire 23 is inserted into a tubular crimping portion 5a and conductive wire 25 of the coated conductive wire 23 is arranged in a conductive wire crimping portion 7a. Further, coated wire 27 is arranged in a coated wire crimping portion 9. The crimping portion 5a is then placed on a lower crimping blade die 31 having a convex portion 17 of a longitudinal direction provided on a base portion 15, and an upper crimping blade die 33 and the lower crimping blade die 31 pinch the crimping portion 5a and make the crimping portion 5a be deformed into a U-shape to crimp the conductive wire 25. At this time, the convex portion 17 of the lower crimping blade die 31 is engaged into a projection 41a of a longitudinal direction provided on a lower surface side 51 of the tubular conductive wire crimping portion 7a of the conductive wire crimping portion 7, so that the conductive wire 25 is allowed to be discharged by the projection 41a to flow toward a side portion 49 from a center portion 47 of a cross-section of the conductive wire crimping portion 7a.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a wire harness and a terminal.

  Conventionally, a terminal composed of a crimping portion and a terminal main body is used as a terminal connected to the coated conductor. On the crimping surface of the crimping part, a latching part called serration is formed at a predetermined interval in the longitudinal direction so as to latch a part of the conducting wire, and the coated conducting wire is crimped to the terminal by the crimping part. (For example, refer to Patent Document 1). Serration prevents the lead wire from coming out of the crimping part by biting into the lead wire exposed from the coating of the coated lead wire at the time of crimping.

  However, when connecting the coated conductor and the terminal, a gap is likely to be formed between the conductor and the crimping part, and the conductor may be exposed to the outside air or water to cause corrosion. In recent years, aluminum conductors have been used to reduce the weight of wire harnesses. However, when connecting aluminum conductors and copper terminals, the contact portion between the conductors of different metals and the terminals is water. May intrude and cause electrolytic corrosion (see, for example, Patent Document 2).

JP 2012-009178 A JP 2012-190635 A

  For the purpose of preventing such intrusion of moisture and the like, a terminal having a crimped portion having a hollow cross section and sealed at one end side has been studied. In a terminal having a crimp section with a hollow cross-section, the crimp section where the coated conductor is disposed is deformed into a U-shape or the like, and the conductor is compressed and flowed outward from the center of the cross section of the crimp section. Crimp the coated conductor. Moreover, it is prevented that water penetrate | invades into a hollow part because a coating | coated part is crimped | bonded by a crimping | compression-bonding part. Here, when the conducting wire is made of aluminum, by providing serrations in the crimping part, not only the conducting wire is prevented from coming off but also an effect of destroying the aluminum oxide film can be obtained.

  However, when using a terminal having a crimped portion with a hollow cross section, at the initial stage of compression flow, if the friction between the lead wire and the crimped portion near the center of the cross section of the crimped portion is large, the lead wire is difficult to flow outside, It becomes difficult to obtain a good contact pressure distribution on the contact surface between the conducting wire and the crimping portion. In addition, since the upper surface side and the lower surface side, which are the crimp height measurement portions, of the terminal after crimping are smoothed, it is difficult to measure the dimensions of the terminal.

  The present invention has been made in view of the above-described problems, and its object is to have a crimp section with a hollow cross section and obtain a good contact pressure distribution on the contact surface between the conductor and the crimp section. It is providing the wire harness and terminal which can do.

  In order to achieve the above-described object, the first invention is a wire harness in which a coated conductor and a terminal are connected, and the terminal is exposed from a coated wire crimping portion for crimping the coated wire and the coated wire. It has a cylindrical crimping portion comprising a lead crimping portion for crimping a lead and a terminal body, and the coated lead is inserted into the cylindrical crimping portion, and the lead crimping portion is deformed to crimp the lead. In this case, the wire harness is characterized in that a protrusion in the longitudinal direction is formed on the lower surface side of the conductor crimping portion so as to protrude in the inner peripheral surface direction.

In the first invention, the vicinity of the ridge becomes a high pressure bonding portion when the conductive wire pressure bonding portion is bonded.
In addition, a linear locking portion is provided in the circumferential direction on the inner peripheral surface on the side surface side and the upper surface side of the conductor crimping portion.

  According to the first invention, when the lead wire crimping portion having a hollow cross section is deformed into a shape such that the lower surface side is convex and the lead wire is crimped, the lead wire crimping portion protrudes in the inner peripheral surface direction toward the lower surface side of the lead wire crimping portion. By forming the protrusions in the longitudinal direction, the fluidity of the lead wire from the center of the cross section of the lead wire crimping portion to the outside is improved, and a good contact pressure distribution is obtained on the contact surface between the lead wire and the crimp portion. In addition, if the protrusions are formed in the inner peripheral surface direction of the terminal and at the same time the recesses are formed on the outer peripheral surface, when measuring the crimping height of the terminal after crimping, the reference position on the lower surface side of the terminal is It becomes clear and dimension measurement becomes easy.

  2nd invention consists of a terminal main body and a cylindrical crimping | compression-bonding part, Comprising: It is a terminal connected to a covered conducting wire, Comprising: The said crimping | crimped part is exposed from the said covered wire and the covered wire crimping part which crimps | bonds a covered wire The lead wire crimping portion comprises a lead wire crimping portion for crimping the lead wire, and the lead wire crimping portion has a longitudinal ridge protruding on the lower surface side in the inner peripheral surface direction.

The vicinity of the ridges becomes a high pressure bonding portion when the conductive wire pressure bonding portion is bonded.
In addition, a linear locking portion is provided in the circumferential direction on the inner peripheral surface on the side surface side and the upper surface side of the conductor crimping portion.

  Since the terminal of 2nd invention has the protruding item | line of the longitudinal direction which protrudes in an inner peripheral surface direction on the lower surface side, it deform | transforms the cross-section hollow conducting wire crimping part into the U-shape where a lower surface side becomes convex, for example When the conducting wire is crimped, the fluidity of the conducting wire from the center of the cross section of the conducting wire crimping portion to the outside is improved. Also, if the terminal has ridges on the inner peripheral surface and at the same time concave grooves on the outer peripheral surface, the reference position on the lower surface side of the terminal is clear when measuring the crimping height of the terminal after crimping. Dimension measurement becomes easy.

  ADVANTAGE OF THE INVENTION According to this invention, the wire harness and terminal which can obtain favorable contact pressure distribution in the contact surface of conducting wire and a crimping | compression-bonding part can be provided.

The figure which shows the state which expanded a part of terminal 1 The figure which shows the terminal 1 and the covering conducting wire 23 The figure which shows the process of forming the wire harness 61 Development view of other crimping part 5a The figure which shows the process of forming another wire harness The figure which shows the state which expanded some terminals 1b Cross section in the circumferential direction of the crimping part 5c

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating a state in which a part of the terminal 1 is developed. FIG. 2 is a diagram showing the terminal 1 and the covered conductor 23.

  As shown in FIGS. 1 and 2, the terminal 1 includes a terminal body 3 and a crimping portion 5. The terminal 1 is made of copper. The terminal body 3 is formed by forming a plate material having a predetermined shape into a cylindrical body having a rectangular cross section as shown in FIG. The terminal body 3 has a terminal contact portion 11 formed by folding a plate material into a rectangular cylinder at the end opposite to the crimping portion 5.

  As shown in FIG. 2, the crimping portion 5 is formed by rounding the plate material having the shape shown in FIG. 1 so as to form a cylindrical body having a circular cross section, and the side edge portions 19 (FIG. 1) are welded by laser welding or the like. It is formed by integrating. The crimp portion 5 includes a covered wire crimp portion 9 and a conductive wire crimp portion 7. The covered wire crimping portion 9 crimps the covered wire 27 of the covered conductor 23 shown in FIG. The lead wire crimping portion 7 crimps the lead wire 25 exposed by peeling off the coating 29 of the covered wire 27.

  As shown in FIG. 1, the lead wire crimping portion 7 is provided with serrations 13 that are linear locking portions at a predetermined interval in the longitudinal direction. The serrations 13 are grooves that are continuous in a concave shape on the inner surface. In the expanded state of the lead wire crimping portion 7, no serration is arranged at the center portion, and serrations 13 are arranged at both outer side portions of the center portion.

  FIG. 3 is a diagram illustrating a process of forming the wire harness 61. FIG. 3A is a view showing a state in which the covered conductor 23 is inserted into the cylindrical crimp portion 5. In Fig.3 (a), a part of crimping | compression-bonding part 5 is cut | disconnected and shown in the longitudinal direction. In order to form the wire harness 61, first, as shown in FIG. 3A, the covered conducting wire 23 is inserted into the tubular crimping portion 5, and the conducting wire 25 of the covered conducting wire 23 is disposed in the conducting wire crimping portion 7. . Further, the covered wire 27 is disposed in the covered wire crimping portion 9.

  FIG. 3B is a diagram showing a state where the crimping part 5 is installed in the crimping blade mold. FIG. 3B illustrates a cross-section at the position of the conductor crimping portion 7. In the step shown in FIG. 3 (b), the crimping part 5 is installed on the lower crimping blade mold 31. Near the center of the bottom 15 of the lower crimping blade mold 31, a convex portion 17 is provided along the longitudinal direction of the conductor crimping portion 7. The crimping part 5 is installed so that the welding part 21 faces the upper crimping blade mold 33.

  In addition, the serration 13 mentioned above will be arrange | positioned in the circumferential direction of the cylindrical crimping | compression-bonding part 5 in the state shown in FIG. In the lead wire crimping portion 7 shown in FIG. 3B, the serrations 13 are arranged on the inner peripheral surface 57 of the side surface 55 and the upper surface 59 corresponding to the arrangement region of the serration 13 shown in FIG. 1.

  FIG. 3C is a diagram showing a state where the conductor crimping portion 7 is deformed. In the step shown in FIG. 3C, the crimping portion 5 is sandwiched between the upper crimping blade die 33 and the lower crimping blade die 31, and the lead wire crimping portion 7 is deformed into a U-shape having a convex bottom surface. The conducting wire 25 is crimped. As described above, the convex portion 17 is provided in the vicinity of the center of the bottom portion 15 of the lower crimping blade die 31. Therefore, when crimping the crimping part 5 and the conductor 25, a longitudinal ridge 41 is formed in the vicinity of the center of the lower surface side 39 of the conductor crimping part 7 so as to protrude toward the inner peripheral surface 57. The vicinity of the ridge 41 becomes a high pressure bonding portion having a relatively large cross-sectional deformation in the lead wire crimping portion 7, and the lead wire 25 flows so as to be pushed out by the ridge 41. In 35, the fluidity | liquidity to the side part 37 of the conducting wire 25 improves. Thereby, in the conducting wire crimping portion 7, the conducting wire 25 can be reliably flowed from the central portion 35, which is a high crimping portion, toward the side portion 37, and the conducting wire 25 can be appropriately disposed in the conducting wire crimping portion 7.

  FIG. 3D shows the wire harness 61. In FIG.3 (d), a part of crimping | compression-bonding part 5 is cut | disconnected and shown in the longitudinal direction. In the step shown in FIG. 3D, the crimping part 5 is removed from the crimping blade mold, and the wire harness 61 is completed. In the wire harness 61, since the conducting wire 25 is appropriately disposed in the conducting wire crimping portion 7, a good contact pressure distribution can be obtained on the contact surface between the conducting wire 25 and the crimping portion 5.

  Thus, in the first embodiment, a crimping die having the convex portion 17 near the center of the bottom 15 of the lower crimping blade die 31 is used. As a result, when the lead wire crimping portion 7 is deformed into a U shape so that the bottom surface is convex and the lead wire 25 is crimped, the lead wire crimping portion 7 protrudes in the direction of the inner peripheral surface 57 near the center of the bottom surface side 39 of the lead wire crimping portion 7. Longitudinal ridges 41 can be formed. When crimping the lead wire crimping portion 7, the vicinity of the ridge 41 becomes a high crimp portion and the fluidity of the lead wire 25 is ensured, so that the side portion 37 from the center portion 35 of the crimp portion 5 of the lead wire crimping portion 7 is secured. The conducting wire 25 can be reliably flowed toward the. In particular, such an effect is exhibited when the conducting wire 25 is made of aluminum.

  Further, in the vicinity of the center of the lower surface side 39 of the conductor crimping portion 7, a longitudinal ridge 41 is formed so as to protrude in the direction of the inner circumferential surface 57, and at the same time, a longitudinal ridge is formed on the outer circumferential surface 43. The Therefore, the wire harness 61 obtained by crimping the terminal 1 and the coated conductor 23 can use the concave strip of the outer peripheral surface 43 of the conductor crimping portion 7 as a reference position on the lower surface side when measuring the crimping height. The dimensions can be easily measured with a clear reference position.

2, 3 </ b> A, and 3 </ b> D, the cross section of the end portion 63 on the terminal body 3 side of the crimp portion 5 is illustrated in the same shape as the cross section of the conductor crimp portion 7. The shape is not limited to this. The end portion 63 is preferably crushed and sealed so that the opening is closed in order to prevent corrosion of the conducting wire 25 due to intrusion of moisture or the like.
Further, the cross-sectional shape of the ridge 41 is not limited to that shown in FIG. For example, if the side surface is tapered, the strength of the portion of the ridge 41 can be increased, and the fluidity of the conductor 25 can be more reliably ensured.

  Next, a second embodiment will be described. FIG. 4 is a development view of another crimping part 5a. In 2nd Embodiment, the terminal which has the crimping | compression-bonding part 5a shown in FIG. 4 is used instead of the terminal 1 which has the crimping | compression-bonding part 5 shown in FIG. As shown in FIG. 4, the crimping part 5a includes a covered wire crimping part 9 and a conductor crimping part 7a.

  As shown in FIG. 4, the conductive wire crimping portion 7a is provided with serrations 13 and ridges 41a which are linear locking portions. The serrations 13 are grooves that are continuous in a concave shape on the inner surface. In the expanded state of the lead wire crimping portion 7a, a longitudinal protrusion 41a is disposed at the central portion, and serrations 13 are disposed at predetermined intervals in the longitudinal direction on both outer portions of the central portion.

  FIG. 5 is a diagram showing a process of forming a wire harness using a terminal having the crimping part 5a shown in FIG. Fig.5 (a) is a figure which shows the state which installed the crimping | compression-bonding part 5a in the crimping blade type | mold. Fig.5 (a) has shown the cross section in the conducting wire crimping part 7a. In order to form a wire harness, first, the covered conducting wire 23 is inserted into the tubular crimping portion 5a, and the conducting wire 25 of the covered conducting wire 23 is placed in the conducting wire crimping portion 7a. Further, the covered wire 27 is disposed in the covered wire crimping portion 9. Further, the covered wire is disposed in the covered wire crimping portion 9. And as shown to Fig.5 (a), the crimping | compression-bonding part 5a is installed in the lower crimping blade type | mold 31. FIG. In the vicinity of the center of the bottom 15 of the lower crimping blade mold 31, a convex portion 17 is provided along the longitudinal direction of the conductor crimping portion 7a.

  In addition, the protrusion 41a mentioned above will be arrange | positioned in the lower surface side 51 of the cylindrical conducting wire crimping | compression-bonding part 7a in the state shown to Fig.5 (a). The crimping portion 5 a is installed such that the welded portion 21 faces the upper crimping blade mold 33 and the convex strip 41 a faces the convex portion 17 provided on the bottom 15 of the lower crimping blade die 31.

  Moreover, the serration 13 mentioned above will be arrange | positioned in the circumferential direction of the cylindrical crimping | compression-bonding part 5a in the state shown in FIG. In the lead wire crimping portion 7a shown in FIG. 5A, the serrations 13 are arranged on the inner peripheral surface 57 of the side surface 55 and the upper surface 59 corresponding to the arrangement region of the serration 13 shown in FIG.

  FIG.5 (b) is a figure which shows the state which deform | transformed the conducting wire crimping | compression-bonding part 7a. In the step shown in FIG. 5B, the crimping portion 5a is sandwiched between the upper crimping blade die 33 and the lower crimping blade die 31, and the conductive wire crimping portion 7a is deformed into a U-shape having a convex bottom surface. The conducting wire 25 is crimped. When crimping the lead wire crimping portion 7a and the lead wire 25, the convex portion 17 of the lower crimping blade mold 31 is fitted into the convex strip 41a on the lower surface side 51 of the lead wire crimping portion 7a. The vicinity of the ridge 41a becomes a high pressure bonding portion having a relatively large cross-sectional deformation in the lead wire crimping portion 7a, and the lead wire 25 flows so as to be pushed out by the ridge 41a. In 47, the fluidity | liquidity to the side part 49 of the conducting wire 25 improves. Thereby, in the conductor crimping part 7a, the conductor 25 can be reliably flowed toward the side part 49 from the center part 47 which is a high crimping part, and the conductor 25 can be arrange | positioned appropriately in the conductor crimping part 7a.

  After the step shown in FIG. 5B, the crimping part 5a is removed from the crimping blade mold to complete the wire harness. In the wire harness, since the conducting wire 25 is appropriately arranged in the conducting wire crimping portion 7a, a good contact pressure distribution can be obtained on the contact surface between the conducting wire 25 and the crimping portion 5a.

  Thus, in 2nd Embodiment, the terminal in which the protruding item | line 41a of the longitudinal direction which protrudes in the inner peripheral surface 57 direction was formed in the vicinity of the center of the lower surface side 51 of the conducting wire crimping part 7a is used. Thereby, when the lead wire crimping part 7a is deformed into a U-shaped shape having a convex bottom surface and the lead wire 25 is crimped, the vicinity of the ridge 41 becomes a high pressure bonding part, and the fluidity of the lead wire 25 is secured. The conductor 25 can be reliably flowed from the central part 47 of the cross section of the conductor crimping part 7a toward the side part 49.

  Further, in the vicinity of the center of the lower surface side 51 of the conductor crimping portion 7a, a longitudinal ridge 41a is formed so as to protrude in the direction of the inner circumferential surface 57, and at the same time, a longitudinal ridge is formed on the outer circumferential surface 43. ing. Therefore, the wire harness obtained by crimping the terminal and the coated conductor 23 can use the concave strip of the outer peripheral surface 43 of the conductor crimping portion 7a as the reference position on the lower surface side when measuring the crimping height. The position becomes clear and the dimensions can be easily measured.

Note that the end of the crimping part 5a on the terminal main body side has an opening in order to prevent corrosion of the conductor 25 due to intrusion of moisture or the like, similarly to the end 63 of the crimping part 5 of the terminal 1 in the first embodiment. It is desirable to crush it so as to close it and seal it with laser welding or the like.
Moreover, the convex part 17 of the lower side crimping blade type | mold 31 is not essential. Furthermore, the cross-sectional shape of the ridge 41a is not limited to that shown in FIG. For example, if the side surface is tapered, the strength of the portion of the ridge 41a can be increased, and the fluidity of the conductor 25 can be more reliably ensured.

  In the first and second embodiments, it has been described that it is desirable to seal one end 63 of the crimping portion by welding. However, in the present invention, even if one end 63 is sealed. When no gap is formed between the side edge portions 19 of the crimping portion in the range where the covered conductor 23 is inserted, it is referred to as a “tubular” crimping portion.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, the linear locking portion in the present invention is not limited to serrations that are continuous grooves. FIG. 6 is a diagram illustrating a state in which a part of the terminal 1b is developed. A terminal 1b shown in FIG. 6 has a crimping part 5b instead of the crimping part 5 of the terminal 1 shown in FIG. As shown in FIG. 6, the crimping part 5b is composed of a coated wire crimping part 9 and a conductor crimping part 7b, and the conductor crimping part 7b has a locking part instead of the serration 13 of the conductor crimping part 7 shown in FIG. 65 is provided. The locking portion 65 is formed by continuously arranging a plurality of concave portions 67 in a line at a predetermined interval. In addition, in FIG. 6, although the planar shape of the recessed part 67 was circular, other shapes, such as a rectangle and a parallelogram, may be sufficient.

  Moreover, in this invention, you may crimp | bond a crimping | compression-bonding part to other shapes instead of the shape shown in FIG.3 (c). FIG. 7 shows a circumferential cross-sectional view of the crimping part 5c. The lead wire crimping portion 7c of the crimping portion 5c shown in FIG. 7 is crimped from four locations indicated by arrows A and B by a crimping blade mold, and deformed into a shape in which the lower surface side is convex. In the lead wire crimping portion 7c, a longitudinal protrusion 41c is formed on the lower surface side so as to protrude in the inner peripheral surface direction. The vicinity of the ridge 41c becomes a high pressure bonding portion having a relatively large cross-sectional deformation in the conductive wire crimping portion 7c, and the conductive wire 25 flows from the central portion 77, which is the high pressure bonding portion, toward the side portion 79 by the pressure bonding.

  7 is pressed from the two locations indicated by the arrow A on the upper side and the two locations indicated by the arrow B on the lower side, so that the terminal can be prevented from rotating during the crimping. Moreover, since the lower surface of the conducting wire crimping portion 7c is flat, it is easy to measure the crimping height.

1, 1b ......... Terminal 3 ......... Terminal body 5, 5a, 5b, 5c ......... Crimp part 7, 7a, 7b, 7c ......... Conductor crimp part 9 ......... Coated wire crimp part 13 ......... Serration 15 ......... Bottom 17 ... ... Protrusion 19 ... ... Side edge 21 ... ... Welded part 23 ... ... Covered conductor 25 ... ... Conductor 27 ... ... Covered wire 29 ... ... Covered 31 ... ... Lower crimp blade type 33 ......... Upper crimp blade type 35, 47, 77 ......... Center part 37, 49, 79 ......... Side part 39, 51 ......... Lower surface side 41, 41a ......... Round 43 ......... Outer peripheral surface 55 ......... Side surface side 57 ......... Inner peripheral surface 59 ......... Upper surface side 61 ......... Wire harness 63 ......... End portion 65 ......... Locking portion 67 ......... Recessed portion

Claims (6)

A wire harness in which a coated conductor and a terminal are connected,
The terminal includes a tubular crimping portion including a coated wire crimping portion that crimps a coated wire and a conductive wire crimping portion that crimps a conductive wire exposed from the coated wire, and a terminal body.
When inserting the covered conducting wire into the tubular crimping portion and deforming the conducting wire crimping portion to crimp the conducting wire, the longitudinal direction is projected to the inner peripheral surface direction on the lower surface side of the conducting wire crimping portion. A wire harness characterized in that ridges are formed.   2. The wire harness according to claim 1, wherein the protrusion is formed in the vicinity of a high pressure bonding portion at the time of pressure bonding of the conductive wire pressure bonding portion.   The wire harness according to claim 1 or 2, wherein a linear locking portion is provided in a circumferential direction on an inner peripheral surface on a side surface side and an upper surface side of the conductor crimping portion. A terminal consisting of a terminal body and a cylindrical crimp part, connected to a coated conductor,
The crimping part is composed of a coated wire crimping part for crimping a coated wire and a conductive wire crimping part for crimping a conductive wire exposed from the coated wire,
The said lead wire crimping | crimp part has the protruding item | line of the longitudinal direction which protrudes in an inner peripheral surface direction on the lower surface side, The terminal characterized by the above-mentioned.   The terminal according to claim 4, wherein the vicinity of the ridge becomes a high pressure bonding portion when the lead wire pressure bonding portion is bonded.   The terminal according to claim 4 or 5, wherein a linear locking portion is provided in a circumferential direction on an inner peripheral surface on a side surface side and an upper surface side of the conductive wire crimping portion.

Images