JP2016018672A - Terminal metal fitting, and electric wire with terminal metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal metal fitting and an electric wire with a terminal metal fitting, capable of improving the reliability of electrical connection between the terminal metal fitting and the electric wire.SOLUTION: A terminal metal fitting 3 of an electric wire with a terminal metal fitting comprises a conductor crimp part 31 formed in a cylindrical shape which has an opening 33 at one end, and into which a terminal of a conductor of an electric wire is inserted from the opening 33 side and crimped. The conductor crimp part 31 has an insertion direction convexoconcave part 38 formed along an insertion direction of the terminal of the conductor, on an inner surface of the conductor crimp part 31. Thereby, since the terminal metal fitting 3 can stabilize the contact resistance between the terminal metal fitting 3 and the conductor, the reliability of electrical connection between the terminal metal fitting 3 and the electric wire can be improved.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a terminal fitting and an electric wire with a terminal fitting.

  As conventional terminal fittings and electric wires with terminal fittings, for example, in Patent Document 1, a cylindrical body part with one end closed and the other end opened, and a space is maintained with respect to the inner peripheral surface of the body part. In this state, a terminal fitting provided with a rod-shaped mandrel extending from the closed one end side of the body portion toward the other end side, and an electric wire with the terminal fitting are disclosed.

JP2013-058341A

  Incidentally, the terminal fitting and the electric wire with terminal fitting described in Patent Document 1 described above have room for further improvement in terms of improving the reliability of electrical connection between the terminal fitting and the electric wire, for example.

  This invention is made in view of said situation, Comprising: It aims at providing the terminal metal fitting which can improve the reliability of the electrical connection of a terminal metal fitting and an electric wire, and an electric wire with a terminal metal fitting. And

  In order to achieve the above object, a terminal fitting according to the present invention includes a conductor crimping portion that is formed as a cylindrical body having an opening at one end and into which a terminal of a conductor of an electric wire is inserted and crimped from the opening side. The crimping part has an insertion direction uneven part formed along the insertion direction of the end of the conductor on the inner surface of the conductor crimping part.

  In the terminal fitting, the conductor crimping portion includes a tapered portion having a tapered surface tapered from one end side to the other end side where the opening is formed on the inner surface, and the insertion direction uneven portion. Can be formed on the tapered surface of the tapered portion along the insertion direction of the end of the conductor.

  In order to achieve the above object, an electric wire with terminal fitting according to the present invention is formed as a tubular body having a linear conductor, a wire having a covering portion covering the outer peripheral side of the conductor, and an opening at one end. A terminal fitting having a conductor crimping portion into which the end of the conductor is inserted and crimped from the opening side, and the conductor crimping portion is formed on the inner surface of the conductor crimping portion along the insertion direction of the conductor end It has the insertion direction uneven | corrugated | grooved part made.

  Moreover, in the said electric wire with a terminal metal fitting, the said conductor shall be a strand wire formed by twisting together several strands helically.

  In the terminal fitting and the electric wire with terminal fitting according to the present invention, the terminal fitting and the electric wire are electrically connected by inserting and crimping the terminal of the conductor of the electric wire into the conductor crimping portion. And, in the terminal fitting and the electric wire with the terminal fitting, the insertion direction uneven portion formed along the insertion direction of the end of the conductor is caught on the conductor crimped to the conductor crimping portion on the inner surface of the conductor crimping portion. Thus, the conductor can be made difficult to come off from the conductor crimping portion, and the contact resistance between the terminal fitting and the conductor can be stabilized. As a result, the terminal fitting and the electric wire with the terminal fitting have an effect that the reliability of the electrical connection between the terminal fitting and the electric wire can be improved.

FIG. 1 is a perspective view illustrating a schematic configuration of an electric wire with terminal fitting according to the first embodiment. FIG. 2 is a side view illustrating a schematic configuration of the terminal fitting of the electric wire with terminal fitting according to the first embodiment. FIG. 3 is a cross-sectional view taken along line AA shown in FIG. FIG. 4 is a front view of the insertion direction protrusion of the electric wire with terminal fitting according to the first embodiment as viewed from the opening side. FIG. 5 is a perspective view illustrating a schematic configuration of the electric wire with terminal fitting according to the second embodiment. FIG. 6 is a cross-sectional view along the extending direction of the terminal fitting of the electric wire with terminal fitting according to the third embodiment. FIG. 7 is a front view of the insertion direction protrusion of the electric wire with terminal fitting according to the third embodiment as viewed from the opening side. FIG. 8 is a cross-sectional view along the extending direction of the terminal fitting of the electric wire with terminal fitting according to the fourth embodiment. FIG. 9 is a front view of the insertion direction protrusion of the electric wire with terminal fitting according to the fourth embodiment as viewed from the opening side. FIG. 10 is a cross-sectional view along the extending direction of the terminal fitting of the electric wire with terminal fitting according to the fifth embodiment.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Embodiment 1]
FIG. 1 is a perspective view illustrating a schematic configuration of an electric wire with terminal fitting according to the first embodiment. FIG. 2 is a side view illustrating a schematic configuration of the terminal fitting of the electric wire with terminal fitting according to the first embodiment. FIG. 3 is a cross-sectional view taken along line AA shown in FIG. FIG. 4 is a front view of the insertion direction protrusion of the electric wire with terminal fitting according to the first embodiment as viewed from the opening side.

  The electric wire 1 with a terminal metal fitting according to the present embodiment shown in FIGS. 1, 2, 3, and 4 is applied to, for example, a wire harness routed in a vehicle. The electric wire 1 with a terminal metal fitting transmits electric power, a control signal, etc. between various electronic devices mounted in a vehicle etc., for example.

  Specifically, the electric wire 1 with a terminal fitting includes an electric wire 2 and a terminal fitting 3, and the terminal fitting 3 is crimped to the terminal 21 b of the electric wire 2 and is electrically and mechanically connected.

  The electric wire 2 includes a linear conductor 21 and a covering portion 22 that covers the outer peripheral side of the conductor 21. The conductor 21 is a conductive core wire and is formed of a metal member through which electricity passes. The conductor 21 is formed to extend with substantially the same diameter with respect to a linearly extending direction (hereinafter sometimes referred to as “extending direction”). The conductor 21 is made of, for example, copper, copper alloy, aluminum, aluminum alloy, or the like. The conductor 21 has a conductor structure formed by twisting the strands 21a, or a rod-shaped conductor structure having a rectangular or round cross section (for example, a conductor structure having a flat single core or a round single core. In this case, the wire itself May also be rod-shaped). In the case of a stranded wire, the conductor 21 may be twisted around a core material (a rigid wire). The conductor 21 illustrated in this figure is a simple bundle of a plurality of strands 21a. The covering portion 22 is a wire covering that covers the outer peripheral side of the conductor 21. The covering portion 22 is provided in contact with the outer peripheral surface of the conductor 21. The covering portion 22 is formed by, for example, extruding an insulating resin material (PP, PVC, cross-linked PE, etc., which is appropriately selected in consideration of wear resistance, chemical resistance, heat resistance, etc.). Is done. The covering portion 22 is formed from one end to the other end in the extending direction of the conductor 21. In the electric wire 2, the covering portion 22 is peeled off at the terminal 21 b of the conductor 21, and the terminal 21 b of the conductor 21 is exposed from the covering portion 22. As an example, the electric wire 2 has a substantially circular cross-sectional shape of the conductor 21 (cross-sectional shape in the direction intersecting the extending direction) and a substantially circular cross-sectional shape of the covering portion 22 (cross-sectional shape in the direction intersecting the extending direction). It has an annular shape, and has a substantially circular cross-sectional shape as a whole.

  The terminal fitting 3 has a conductor crimping part 31 and a connection part 32. The terminal fitting 3 is made of a conductive metal member. The terminal fitting 3 is made of, for example, copper, copper alloy, aluminum, or aluminum alloy. The conductor crimping portion 31 is formed in a cylindrical shape having an opening 33 at one end, and the terminal 21b of the conductor 21 of the electric wire 2 is inserted and crimped from the opening 33 side. The opening 33 is formed in a substantially perfect circle shape. Here, the conductor crimping part 31 is formed as a cylindrical body whose central axis is along the extending direction of the electric wire 2, and the conductor 21 of the electric wire 2 is inserted along the central axis. That is, typically, the extending direction of the electric wire 2, the direction along the central axis of the conductor crimping portion 31, and the insertion direction of the conductor 21 into the conductor crimping portion 31 are substantially parallel and along each other. Direction. The conductor crimping portion 31 has an opening 33 at one end, the other end is closed, and the connecting portion 32 is integrally formed on the closed end side. For example, the conductor crimping portion 31 is formed into a predetermined shape by crushing one end of a cylindrical pipe member by pressing or the like, whereby the connection portion 32 is integrally formed on the closed end side. The connection portion 32 is a portion that is electrically connected to an electrode or the like provided in an electrical device such as a counterpart terminal or a battery. Here, the connection portion 32 is formed in a flat shape, and a substantially circular through hole 32a is formed in the center portion.

  Here, the terminal fitting 3 is a so-called closed barrel type conductor crimping portion 31. That is, the conductor crimping portion 31 is formed as a seamless cylindrical body that is continuous over the entire circumference in the circumferential direction and has no seams or the like. Furthermore, the conductor crimping part 31 is formed in a cylindrical shape before the caulking process.

  And the terminal metal fitting 3 of this embodiment is the terminal metal fitting 3 because the conductor crimping | compression-bonding part 31 has the insertion direction protrusion part (convex part) 38 as an insertion direction uneven | corrugated | grooved part, as shown in FIG. 3, FIG. The reliability of the electrical connection between the cable 2 and the electric wire 2 is improved. Specifically, the conductor crimping portion 31 includes a crimping main body portion 34 and an edge portion 35, and the insertion direction protrusion 38 constitutes the edge portion 35.

  The crimping main body 34 is formed as a cylindrical body whose central axis is along the extending direction of the electric wire 2. In the conductor crimping portion 31, a cylindrical portion 36 formed in a cylindrical shape on one end side in the extending direction of the crimping main body portion 34 is integrally continuous, and the opening 33 is formed in the cylindrical portion 36. The cylindrical portion 36 is formed as a large diameter portion whose outer diameter is larger than the outer diameter of the crimping main body portion 34. On the other hand, the conductor crimping portion 31 is integrally formed with a connecting portion 37 with the connection portion 32 at the other end side in the extending direction of the crimping main body portion 34.

  The edge portion 35 is securely and electrically connected to the terminal fitting 3 and the conductor 21 of the electric wire 2 by being hooked on the conductor 21 in a state where the terminal 21b of the conductor 21 of the electric wire 2 is inserted into the conductor crimping portion 31 and is crimped. This is the part to be connected.

  The edge portion 35 of the present embodiment is configured to include an insertion direction protrusion 38. The insertion direction protrusion 38 is formed on the inner peripheral surface of the crimping main body 34 as a linear protrusion along the insertion direction of the terminal 21 b of the conductor 21, that is, the extending direction of the electric wire 2. The insertion direction protrusion 38 protrudes radially inward from the inner peripheral surface of the crimping main body 34. A plurality of insertion direction protrusions 38 are formed at equal intervals along the circumferential direction of the crimping main body 34, and here, eight are formed. In other words, in the terminal fitting 3, a portion between the insertion direction protrusions 38 adjacent in the circumferential direction of the crimping main body portion 34 becomes an insertion direction groove portion (concave portion). Here, the insertion direction protrusion 38 is formed in a substantially rectangular shape in cross section along the radial direction (see FIG. 4 and the like). The insertion direction protrusion 38 is formed by, for example, pressing a metal mold or the like from the opening 33 side of the conductor crimping portion 31. Here, the plurality of insertion direction protrusions 38 have been described as being formed at regular intervals along the circumferential direction of the crimping main body 34. However, the present invention is not limited thereto, and is formed randomly at irregular intervals. Also good.

  In the electric wire 1 with a terminal fitting configured as described above, the terminal 21b of the conductor 21 of the electric wire 2 is inserted into the conductor crimping portion 31 of the terminal fitting 3 through the opening 33, and from the outer peripheral side of the conductor crimping portion 31. By crimping, the conductor crimping portion 31 is deformed and crushed, and the terminal 21 b of the conductor 21 is crimped to the conductor crimping portion 31. In addition, in FIG. 1, although the arrow is shown as what crimps in the up-down direction in the figure, the direction of crimping is not restricted to this, You may crimp in the left-right direction orthogonal to an up-down direction, It may be crimped from all around. Thereby, as for the electric wire 1 with a terminal metal fitting, the terminal metal fitting 3 and the electric wire 2 are electrically connected. In the electric wire 1 with terminal fitting, in the conductor crimping portion 31, each insertion direction protrusion 38 constituting the edge portion 35 formed on the crimping main body portion 34 is caught by the conductor 21 crimped to the conductor crimping portion 31. By biting in, it is possible to make it difficult for the conductor 21 to come out of the conductor crimping portion 31, and to improve the holding force between the terminal fitting 3 and the electric wire 2. Further, in the electric wire with terminal fitting 1, in the conductor crimping portion 31, for example, the oxide film on the surface of the conductor 21 is broken or scraped off by the corner portion of each insertion direction protrusion 38 constituting the edge portion 35. The conductive surface (new surface) of the conductor 21 comes into contact with the conductor crimping portion 31 with an extremely low electric resistance, and the terminal fitting 3 and the conductor 21 are brought into contact with each other. Thereby, the electric wire 1 with a terminal metal fitting can stabilize the contact resistance of the terminal metal fitting 3 and the conductor 21, and can improve conduction | electrical_connection performance. In addition, since the terminal fitting 3 and the conductor 21 are brought into contact with each other via the insertion direction protrusions 38 constituting the edge portion 35, the contact area of the electric wire 1 with the terminal fitting is increased. In addition, the contact resistance can be stabilized and the conduction performance can be improved.

  The terminal fitting 3 described above includes a conductor crimping portion 31 that is formed as a cylindrical body having an opening 33 at one end, is inserted into the terminal 21b of the conductor 21 of the electric wire 2 from the opening 33 side, and is crimped. The part 31 has an insertion direction protrusion 38 formed along the insertion direction of the terminal 21 b of the conductor 21 on the inner surface of the conductor crimping part 31.

  According to the electric wire 1 with terminal fittings described above, the electric wire 2 having the linear conductor 21 and the covering portion 22 covering the outer peripheral side of the conductor 21, and the opening 33 formed as a cylinder having an opening 33 at one end. A terminal fitting 3 having a conductor crimping portion 31 into which the terminal 21b of the conductor 21 is inserted and crimped from the side. The conductor crimping portion 31 is formed on the inner surface of the conductor crimping portion 31 in the insertion direction of the terminal 21b of the conductor 21. It has the insertion direction protrusion part 38 formed along.

  Therefore, the terminal fitting 3 and the electric wire 1 with terminal fitting are electrically connected to the terminal fitting 3 and the electric wire 2 by inserting and crimping the terminal 21b of the conductor 21 of the electric wire 2 into the conductor crimping portion 31. In the terminal fitting 3 and the electric wire 1 with terminal fitting, an insertion direction protrusion 38 formed along the insertion direction of the terminal 21 b of the conductor 21 is crimped to the conductor crimping portion 31 on the inner surface of the conductor crimping portion 31. By being caught by the conductor 21, the conductor 21 can be made difficult to come off from the conductor crimping portion 31, and the contact resistance between the terminal fitting 3 and the conductor 21 can be stabilized. Further, the terminal fitting 3 and the electric wire 1 with the terminal fitting are formed, for example, by inserting a die or the like from the opening 33 side of the conductor crimping portion 31 and performing press working or the like in the insertion direction protruding portion 38 constituting the edge portion 35. At this time, since the mold can be easily removed, the workability of the edge portion 35 can be further improved. As a result, the terminal fitting 3 and the electric wire 1 with the terminal fitting can improve the reliability of electrical connection between the terminal fitting 3 and the electric wire 2.

[Embodiment 2]
FIG. 5 is a perspective view illustrating a schematic configuration of the electric wire with terminal fitting according to the second embodiment. The terminal metal fitting according to the second embodiment and the electric wire with terminal metal fitting are different from the first embodiment in the configuration of the conductor of the electric wire. In addition, about the structure, an effect | action, and effect which are common in embodiment mentioned above, the overlapping description is abbreviate | omitted as much as possible (hereinafter, the same).

  An electric wire 201 with terminal fittings according to this embodiment shown in FIG. 5 includes an electric wire 202 and a terminal fitting 3. The electric wire 202 includes a conductor 221 and a covering portion 22. The terminal fitting 3 has a conductor crimping part 31 and a connection part 32. Here, the electric wire 201 with terminal metal fitting has a configuration substantially equivalent to the electric wire 1 with terminal metal fitting described above except for the configuration of the conductor 221. The conductor 221 of this embodiment is a stranded wire formed by twisting a plurality of strands 21a in a spiral shape.

  In the terminal fitting 3 and the electric wire 201 with terminal fitting described above, the terminal fitting 3 and the electric wire 202 are electrically connected by inserting and crimping the terminal 21b of the conductor 221 of the electric wire 202 into the conductor crimping portion 31. The The terminal fitting 3 and the electric wire 201 with the terminal fitting have an insertion direction protrusion 38 (see FIG. 3 etc.) formed on the inner surface of the conductor crimping portion 31 along the insertion direction of the terminal 21b of the conductor 221. By being caught by the conductor 221 crimped to the crimping part 31, the conductor 221 can be made difficult to come off from the conductor crimping part 31, and the contact resistance between the terminal fitting 3 and the conductor 221 can be stabilized. In addition, the terminal fitting 3 and the electric wire 201 with the terminal fitting are inserted, for example, by inserting a mold or the like from the opening 33 side of the conductor crimping portion 31 into the insertion direction protruding portion 38 constituting the edge portion 35 (see FIG. 3 and the like). Since it can be set as the structure which can draw | extract the said metal mold | die easily when forming by press work etc., the workability of the edge part 35 can further be improved. As a result, the terminal fitting 3 and the electric wire 201 with terminal fitting can improve the reliability of electrical connection between the terminal fitting 3 and the electric wire 202.

  Furthermore, according to the terminal fitting 3 and the electric wire 201 with the terminal fitting described above, the conductor 221 is a stranded wire formed by twisting a plurality of strands 21a in a spiral shape. Therefore, the terminal fitting 3 and the electric wire 201 with the terminal fitting can be configured so that the insertion direction protrusion 38 constituting the edge portion 35 and the strand 21a of the conductor 221 twisted in a spiral shape can easily cross each other. The insertion direction protrusion 38 can be easily caught by being caught by the conductor 221. As a result, the terminal fitting 3 and the electric wire 201 with terminal fitting can surely realize the hooking (biting) of the insertion direction protrusion 38 into the conductor 221 with a strong force. Therefore, the terminal fitting 3 and the electric wire 201 with the terminal fitting can further stabilize the contact resistance between the terminal fitting 3 and the conductor 221, and further improve the reliability of the electrical connection between the terminal fitting 3 and the electric wire 202. Can do.

[Embodiment 3]
FIG. 6 is a cross-sectional view along the extending direction of the terminal fitting of the electric wire with terminal fitting according to the third embodiment. FIG. 7 is a front view of the insertion direction protrusion of the electric wire with terminal fitting according to the third embodiment as viewed from the opening side. The terminal metal fitting according to the third embodiment and the electric wire with the terminal metal fitting are different from those of the first embodiment in the shape of the uneven portion in the insertion direction.

  The electric wire 301 with a terminal metal fitting which concerns on this embodiment shown in FIG. 6, FIG. 7 is provided with the electric wire 2 (refer FIG. 1 etc.) and the terminal metal fitting 303. FIG. The electric wire 2 includes a conductor 21 (see FIG. 1 and the like) and a covering portion 22 (see FIG. 1 and the like). The terminal fitting 303 includes a conductor crimping portion 31 and a connection portion 32 (see FIG. 1 and the like). The conductor crimping portion 31 has an insertion direction protrusion 338 as an insertion direction uneven portion. Here, the conductor crimping part 31 has substantially the same configuration as the conductor crimping part 31 of the electric wire with terminal fitting 1 except for the insertion direction protrusion 338. The insertion direction protrusion 338 constitutes an edge portion 335.

  The edge portion 335 of the present embodiment is configured to include an insertion direction protrusion 338. The insertion direction protrusion 338 has substantially the same configuration as the above-described insertion direction protrusion 38 except for the cross-sectional shape along the radial direction. In the insertion direction protrusion 338 of this embodiment, the cross-sectional shape along the radial direction is formed in a substantially triangular shape (see FIG. 7 and the like).

  In the terminal fitting 303 and the electric wire 301 with terminal fitting described above, the terminal fitting 303 and the electric wire 2 are electrically connected by inserting and crimping the terminal 21b of the conductor 21 of the electric wire 2 into the conductor crimping portion 31. The In the terminal fitting 303 and the electric wire 301 with terminal fitting, the insertion direction protrusion 338 formed along the insertion direction of the terminal 21 b of the conductor 21 is crimped to the conductor crimping portion 31 on the inner surface of the conductor crimping portion 31. By being caught by the conductor 21, the conductor 21 can be made difficult to come off from the conductor crimping portion 31, and the contact resistance between the terminal fitting 303 and the conductor 21 can be stabilized. In addition, the terminal fitting 303 and the electric wire 301 with terminal fitting are formed, for example, by inserting a die or the like from the opening 33 side of the conductor crimping portion 31 and pressing the insertion direction protrusion 338 constituting the edge portion 335. At this time, since the mold can be easily removed, the workability of the edge portion 335 can be further improved. As a result, the terminal fitting 303 and the electric wire 301 with terminal fitting can improve the reliability of the electrical connection between the terminal fitting 303 and the electric wire 2.

[Embodiment 4]
FIG. 8 is a cross-sectional view along the extending direction of the terminal fitting of the electric wire with terminal fitting according to the fourth embodiment. FIG. 9 is a front view of the insertion direction protrusion of the electric wire with terminal fitting according to the fourth embodiment as viewed from the opening side. The terminal metal fitting according to the fourth embodiment and the electric wire with the terminal metal fitting are different from those in the first embodiment in the shape of the uneven portion in the insertion direction.

  An electric wire with terminal fitting 401 according to this embodiment shown in FIGS. 8 and 9 includes an electric wire 2 (see FIG. 1 and the like) and a terminal fitting 403. The electric wire 2 includes a conductor 21 (see FIG. 1 and the like) and a covering portion 22 (see FIG. 1 and the like). The terminal fitting 403 includes a conductor crimping portion 31 and a connection portion 32 (see FIG. 1 and the like). The conductor crimping part 31 has an insertion direction groove part (concave part) 438 as an insertion direction uneven part. Here, the conductor crimping portion 31 has substantially the same configuration as the conductor crimping portion 31 of the above-described electric wire with terminal fitting 1 except for the insertion direction groove portion 438. The insertion direction groove portion 438 constitutes an edge portion 435.

  The edge portion 435 of the present embodiment includes an insertion direction groove portion 438. The insertion direction groove 438 is formed in the inner peripheral surface of the crimp main body 34 as a linear recess along the insertion direction of the terminal 21 b of the conductor 21, that is, the extending direction of the electric wire 2. The insertion direction groove 438 is recessed from the inner peripheral surface of the crimping main body 34 toward the radially outer side. A plurality of insertion direction grooves 438 are formed at equal intervals along the circumferential direction of the crimping main body 34, and here, eight are formed. In other words, in the terminal fitting 403, a portion between the insertion direction groove portions 438 adjacent in the circumferential direction of the crimping main body portion 34 is an insertion direction protrusion (convex portion). Here, the insertion direction groove portion 438 is illustrated as having a substantially triangular shape (see FIG. 9 and the like) in cross section along the radial direction, but may be a substantially rectangular shape, a substantially semicircular shape, or the like. . The insertion direction groove 438 is formed by, for example, pressing a metal mold or the like from the opening 33 side of the conductor crimping portion 31. Here, the plurality of insertion direction groove portions 438 are described as being formed at equal intervals along the circumferential direction of the crimping main body portion 34. However, the present invention is not limited thereto, and may be formed randomly at unequal intervals. Good.

  The terminal fitting 403 and the electric wire with terminal fitting 401 described above are electrically connected to the terminal fitting 403 and the electric wire 2 by inserting and crimping the terminal 21b of the conductor 21 of the electric wire 2 into the conductor crimping portion 31. The In the terminal fitting 403 and the electric wire 401 with terminal fitting, an insertion direction groove 438 formed along the insertion direction of the terminal 21 b of the conductor 21 is crimped to the conductor crimping portion 31 on the inner surface of the conductor crimping portion 31. By being caught by the conductor 21, the conductor 21 can be made difficult to come off from the conductor crimping portion 31, and the contact resistance between the terminal fitting 403 and the conductor 21 can be stabilized. The terminal fitting 403 and the electric wire 401 with terminal fitting are formed by, for example, forming the insertion direction groove portion 438 constituting the edge portion 435 by pressing a die or the like from the opening 33 side of the conductor crimping portion 31. Furthermore, since the mold can be easily removed, the workability of the edge portion 435 can be further improved. As a result, the terminal fitting 403 and the electric wire 401 with the terminal fitting can improve the reliability of the electrical connection between the terminal fitting 403 and the electric wire 2.

[Embodiment 5]
FIG. 10 is a cross-sectional view along the extending direction of the terminal fitting of the electric wire with terminal fitting according to the fifth embodiment. The terminal metal fitting according to the fifth embodiment and the electric wire with terminal metal fitting are different from the first embodiment in the shape of the conductor crimping portion.

  An electric wire 501 with a terminal fitting according to the present embodiment shown in FIG. 10 includes an electric wire 2 (see FIG. 1 and the like) and a terminal fitting 503. The electric wire 2 includes a conductor 21 and a covering portion 22. The terminal fitting 503 has a conductor crimping portion 531 and a connection portion 32 (see FIG. 1 and the like). Here, the conductor crimping portion 531 has substantially the same configuration as the above-described terminal fitting 3 except that the conductor crimping portion 531 has a tapered portion 534 instead of the aforementioned crimping main body portion 34. The conductor crimping portion 531 has an edge portion 535 formed on the taper portion 534.

  The tapered portion 534 is a portion where a tapered surface 534 a is formed on the inner peripheral surface of the conductor crimping portion 531. The tapered surface 534a is inclined so as to taper from the one end side where the opening 33 is formed toward the other end side closed. Here, the taper portion 534 is also formed with a taper surface 534b that tapers from the one end side where the opening 33 is formed in the conductor crimping portion 531 toward the other end side closed. In other words, the tapered portion 534 is formed in a truncated cone shape that gradually decreases in diameter from the opening 33 side toward the connection portion 32 side. In the conductor crimping portion 531 of this embodiment, a cylindrical portion 36 formed in a cylindrical shape on one end side in the extending direction of the tapered portion 534 is integrally continuous, and the opening 33 is formed in the cylindrical portion 36. The cylindrical portion 36 is formed as a large diameter portion whose outer diameter is larger than the outer diameter of the tapered portion 534. On the other hand, in the conductor crimping portion 531, a connecting portion 37 with the connecting portion 32 is integrally and continuously formed on the other end side in the extending direction of the tapered portion 534.

  The edge portion 535 of the present embodiment includes an insertion direction protrusion 538 as an insertion direction uneven portion. The insertion direction protrusion 538 is formed on the tapered surface 534a on the inner peripheral surface side of the taper portion 534 as a linear protrusion along the insertion direction of the terminal 21b of the conductor 21, that is, the extending direction of the electric wire 2. . The insertion direction protrusion 538 protrudes radially inward from the inner peripheral surface of the tapered portion 534. A plurality of insertion direction protrusions 538 are formed at equal intervals along the circumferential direction of the tapered portion 534, and here, eight are formed. In other words, in the terminal fitting 503, a portion between the insertion direction protrusions 538 adjacent in the circumferential direction of the tapered portion 534 becomes an insertion direction groove (concave portion). Here, the insertion direction protrusion 538 is illustrated as having a substantially rectangular cross-sectional shape along the radial direction, but may be a substantially triangular shape, a substantially semicircular shape, or the like. The plurality of insertion direction protrusions 538 are formed such that the radial distance gradually decreases along the inclination of the tapered surface 534a of the tapered portion 534 from the opening 33 side toward the connecting portion 32 side. The insertion direction protrusion 538 is formed by, for example, pressing a metal mold or the like from the opening 33 side of the conductor crimping portion 531. Here, the plurality of insertion direction protrusions 538 are described as being formed at equal intervals along the circumferential direction of the taper portion 534. However, the present invention is not limited thereto, and may be formed randomly at unequal intervals. Good.

  The terminal fitting 503 and the electric wire 501 with terminal fitting described above are electrically connected to the terminal fitting 503 and the electric wire 2 by inserting and crimping the terminal 21b of the conductor 21 of the electric wire 2 to the conductor crimping portion 531. The In the terminal fitting 503 and the electric wire 501 with terminal fitting, an insertion direction protrusion 538 formed along the insertion direction of the terminal 21 b of the conductor 21 is crimped to the conductor crimping portion 531 on the inner surface of the conductor crimping portion 531. By being caught by the conductor 21, the conductor 21 can be made difficult to come off from the conductor crimping portion 531, and the contact resistance between the terminal fitting 503 and the conductor 21 can be stabilized. Further, the terminal fitting 503 and the electric wire 501 with the terminal fitting are formed by, for example, pressing the insertion direction protrusion 538 constituting the edge portion 535 by inserting a die or the like from the opening 33 side of the conductor crimping portion 531. At this time, since the mold can be easily removed, the workability of the edge portion 535 can be further improved. As a result, the terminal fitting 503 and the electric wire 501 with terminal fitting can improve the reliability of electrical connection between the terminal fitting 503 and the electric wire 2.

  Furthermore, according to the terminal fitting 503 and the electric wire 501 with terminal fitting described above, the conductor crimping portion 531 is formed with the tapered surface 534a that tapers from one end side to the other end side where the opening 33 is formed on the inner surface. The insertion direction protrusion 538 is formed on the tapered surface 534a of the taper 534 along the insertion direction of the terminal 21b of the conductor 21. Accordingly, the terminal fitting 503 and the electric wire 501 with terminal fitting have a shape in which the tapered surface 534a of the tapered portion 534 formed with the insertion direction protrusions 538 is tapered from the opening 33 side toward the connecting portion 32 side. ing. Thereby, the terminal metal fitting 503 and the electric wire 501 with terminal metal fitting can make it easy to form the insertion direction protrusion 538 by pressing or the like by inserting a die or the like from the opening 33 side of the conductor crimping portion 531. Therefore, the workability of the edge portion 535 can be further improved.

  In addition, the terminal metal fitting which concerns on embodiment of this invention mentioned above, and an electric wire with a terminal metal fitting are not limited to embodiment mentioned above, A various change is possible in the range described in the claim. You may comprise the terminal metal fitting which concerns on this embodiment, and an electric wire with a terminal metal fitting by combining suitably the component of each embodiment demonstrated above and the modification.

  The conductor crimping portions 31 and 531 described above are described as a cylindrical body whose central axis is along the extending direction of the electric wire 2, but not limited thereto, a substantially rectangular shape, a substantially polygonal shape, etc. What is necessary is just a cylindrical body. In the above description, the insertion direction protrusions 38 and 338 have been described as having a substantially rectangular or substantially triangular cross-sectional shape along the radial direction. However, the present invention is not limited to this. It may be a shape or the like.

1, 201, 301, 401, 501 Electric wires with terminal fittings 2, 202 Electric wires 3, 303, 403, 503 Terminal fittings 21, 221 Conductor 21a Wire 21b Terminal 22 Covering portion 31, 531 Conductor crimping portion 33 Opening 38, 338, 538 Insertion direction protrusion (Insertion direction uneven part)
438 Insertion direction groove (insertion uneven portion)
534 Tapered part 534a, 534b Tapered surface

Claims (4)

It is formed as a cylindrical body having an opening at one end, and is provided with a conductor crimping portion to which a terminal of a conductor of an electric wire is inserted and crimped from the opening side,
The conductor crimping part has an insertion direction uneven part formed along the insertion direction of the end of the conductor on the inner surface of the conductor crimping part,
Terminal fitting. The conductor crimping portion has a tapered portion formed with a tapered surface that tapers from one end side to the other end side where the opening is formed on the inner surface;
The insertion direction uneven part is formed on the tapered surface of the taper part along the insertion direction of the terminal of the conductor.
The terminal fitting according to claim 1. An electric wire having a linear conductor and a covering portion covering the outer peripheral side of the conductor;
A terminal fitting having a conductor crimping portion that is formed as a cylindrical body having an opening at one end and the terminal of the conductor is inserted and crimped from the opening side;
The conductor crimping part has an insertion direction uneven part formed along the insertion direction of the end of the conductor on the inner surface of the conductor crimping part,
Electric wire with terminal fittings. The conductor is a stranded wire formed by twisting a plurality of strands in a spiral.
The electric wire with a terminal metal fitting according to claim 3.

Images