JP2015133270A - Coated electric wire, connection structure, wire harness, connector, and manufacturing method of coated electric wire and connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coated electric wire, a connection structure, and a wire harness which are capable of reliably preventing infiltration of moisture from an insulating coating side, and a manufacturing method of a coated electric wire, a connector, and a connection structure.SOLUTION: In the state where a crimp part 322 in a crimp terminal 300 and a coating tip part 220T closer to a tip of an insulating coating 220 are crimped by a pair of crimping blade dies 600, areas corresponding to boundaries between crimping surfaces 610 of each crimping blade die 600 are set as areas 400Z corresponding to crimping surface boundaries in a circumferential direction of the coating tip part 220T, and an elastic protrusion 221 which protrudes so as to be elastically deformed associated with compression of the crimp part 322 is included at least in the areas 400Z corresponding to crimping surface boundaries in the circumferential direction of the coating tip part 220T.

Description

  The present invention relates to a covered electric wire having an electric wire tip composed of a conductor exposed portion from which the insulating coating on the tip side is peeled to expose a conductor and a coated tip portion on the tip side of the insulating coating, and the electric wire tip of the covered electric wire The present invention relates to a connection structure, a wire harness, a connector, a covered electric wire, and a method for manufacturing a connection structure, which are crimped and connected by a crimping portion in a crimp terminal.

An electrical equipment equipped in an automobile or the like is connected to another electrical equipment or a power supply device via a wire harness in which covered electric wires are bundled to constitute an electrical circuit. At this time, the wire harness and the electrical equipment and the power supply device are connected to each other by connectors attached thereto.
These connectors have a configuration in which a crimp terminal connected by crimping to a covered electric wire is mounted inside, and a female connector and a male connector that are connected corresponding to the unevenness are fitted.

  By the way, since such a connector is used in various environments, unintended moisture may adhere to the surface of the covered electric wire due to dew condensation due to a change in ambient temperature. When moisture enters the connector along the surface of the covered electric wire, there is a problem that the surface of the electric wire conductor exposed from the tip of the covered electric wire is corroded.

Thus, various techniques for preventing moisture from entering the wire conductor crimped by the crimp terminal have been proposed.
For example, the crimp terminal described in Patent Document 1 is a crimp terminal including a conductor crimp portion that crimps a conductor of an electric wire and a cover crimp portion that crimps an insulating coating of the electric wire. Serrations are provided in a direction that intersects the longitudinal direction of the film, and the boundary between the coated crimping portion and the insulating coating is made uneven. Thereby, the crimp terminal of Patent Document 1 is supposed to complicate the moisture intrusion path and prevent moisture from entering from the insulating coating side.

  However, since the crimp terminal as in Patent Document 1 has a configuration in which a serration having a concave shape is simply provided on the coated crimp portion, the water stoppage due to the serration is more reliably ensured unless the coated crimp portion is securely crimped. There was a problem that could not be done.

JP2011-216253A

  In view of the above problems, the present invention provides a covered electric wire, a connection structure, a wire harness, a connector, a covered electric wire, and a method for manufacturing the connection structure that can reliably prevent moisture from entering from the insulating coating side. The purpose is to provide.

  According to the present invention, an electric wire tip composed of a conductor exposed portion where a conductor is exposed by peeling off the insulating coating on the tip side and a coating tip portion on the tip side of the insulating coating is crimped with a hollow cross section in a crimp terminal. A covered electric wire configured to be crimped and connected by crimping with a portion, and at least a part in a circumferential direction of the coated tip portion is provided with an elastic protrusion protruding so as to be elastically deformed as the crimped portion is compressed. It is characterized by having.

  According to the above-described configuration, since the elastic protrusion is provided in at least a part of the circumferential direction of the covering tip portion, the compression ratio of which tends to be low, the crimped portion and the wire tip portion are connected by crimping. In at least a part of the structure, the elastic protrusion can be kept in a state of being in close contact with the crimping portion.

  Therefore, in the state where the crimping portion and the wire tip portion are crimped and connected, there is no gap between the crimping portion and the coating tip portion, and excellent water stoppage can be obtained.

  As an aspect of the present invention, the elastic protrusion can be formed over the entire circumference of the covering tip at least at a part in the longitudinal direction of the covering tip.

  According to the structure mentioned above, it can prevent reliably that the clearance gap between a crimping | compression-bonding part and a coating | coated front-end | tip part communicates along the longitudinal direction of a coating | coated front-end | tip part, and can obtain the more outstanding water stop.

  Here, as long as the elastic protrusion is formed over at least the entire circumference, the elastic protrusion is not limited to an endless shape such as an annular shape, and may be formed into an end shape such as a spiral shape. .

  In particular, by forming the elastic protrusion endlessly over the entire circumference of the covering tip, the gap between the crimping portion and the covering tip in the state where the crimping portion and the wire tip are crimped and connected. Can be reliably divided along the longitudinal direction of the coating tip by the elastic protrusion, and excellent water stoppage can be obtained.

  Further, as an aspect of the present invention, a groove formed in a concave shape with respect to the elastic protrusion is provided in a peripheral portion of the elastic protrusion on the outer peripheral surface of the covering tip. It can be formed in a discontinuous shape divided by the part.

  According to the configuration described above, in a state where the crimping portion and the wire tip portion are crimped and connected, for example, a gap is formed between the groove portion on the outer peripheral surface of the covering tip portion and the crimping portion. However, since the gap can be divided by the elastic protrusion, a flow path is not formed when the gap communicates in the longitudinal direction of the coating tip, and excellent water stoppage is obtained. Can do.

  Further, as an aspect of the present invention, a plurality of the elastic protrusions are provided, and the first elastic protrusion and a second elastic protrusion having a smaller protrusion amount than the first elastic protrusion, and the covering tip portion The second elastic protrusions can be disposed between the first elastic protrusions adjacent in the longitudinal direction.

  According to the above-described configuration, the first elastic protrusion is mainly disposed in the elastic deformation region by disposing the second elastic protrusion between the first elastic protrusions. Compressive force that allows the first elastic protrusion to reach the plastic deformation region from the crimping blade mold via the crimping part, as well as making good use of the excellent elastic force by the part. Even when the first elastic protrusion is received, the second elastic protrusion can be elastically supported so as not to be compressed and deformed until the first elastic protrusion reaches the plastic deformation region.

  Therefore, in the state where the crimping portion and the wire tip are crimped and connected, the crimping portion and the wire tip can be brought into close contact with each other by reliably utilizing the elasticity of the first elastic protrusion. Can be reliably removed.

  As an aspect of the present invention, the second elastic protrusion can be formed to protrude beyond the protruding length of the first elastic protrusion that has been compressed and deformed until it reaches the plastic deformation region beyond the elastic deformation region.

  As an aspect of the present invention, the front second elastic protrusion can be formed so as to protrude more than half of the protrusion length of the first elastic protrusion.

  Further, as an aspect of the present invention, in a state where the crimping part and the wire tip part are crimped by a pair of crimping blade molds facing each other with the coating tip part therebetween, the pair of the above-mentioned in the circumferential direction of the coating tip part A location corresponding to the boundary between the respective crimping surfaces of the crimping blade mold is set as a location corresponding to the crimping surface boundary, and the elastic protrusion is at least at the location corresponding to the crimping surface boundary on the outer peripheral surface of the covering tip. It can form so that it may become convex with respect to the peripheral part of this crimping | compression-bonding surface equivalent location.

  According to the above-described configuration, the elastic protrusion is formed so that the outer peripheral surface of the covering tip is convex, so that the elastic protrusion is not displaced with respect to the covering tip. The elastic protrusion having excellent integrity can be formed as a part of the coating tip.

  Therefore, in a state where the crimping part and the wire tip part are crimped and connected, the elastic protrusion can be brought into close contact with the crimping part accurately at a location corresponding to the boundary of the crimping surface. It is possible to reliably remove the gaps between them and to obtain excellent water stoppage.

  Further, as an aspect of the present invention, an insulating coating mounting body to be mounted on the outer peripheral surface of the coating leading end portion may be provided at the covering tip portion, and the elastic protrusion may be formed on the outer peripheral surface of the insulating coating mounting body.

  According to the configuration described above, the outer periphery of the coated tip portion is mounted by mounting the insulating coating mounting body on the coated tip portion of a normal coated electric wire that does not have the elastic protrusion on the outer peripheral surface of the coated tip portion. A covered electric wire having the elastic protrusion on the surface can be formed, and a gap is generated between the crimping portion and the coating tip at a location corresponding to the crimping surface boundary in a state where the crimping portion and the wire tip are crimped and connected. There is no, and the outstanding water stop can be obtained.

  The insulating coating mounting body is not particularly limited as long as it is configured to be mounted on the outer peripheral surface of the coating tip portion, for example, a cylindrical shape that inserts and mounts the coating tip portion, Only the elastic protrusion may be formed by attaching an annular member so as to form a protrusion on the outer peripheral surface of the coating tip.

  Here, the insulating coating mounting body is not limited to being formed of the same material as the insulating coating, but may be formed of a material different from the insulating coating. Specifically, it may be formed of a synthetic resin such as polyvinyl chloride, but is not limited thereto, and may be formed of a rubber-based material so that the elastic protrusion can obtain a desired elastic coefficient. It can be made of any material.

  The present invention relates to a conductor exposed portion in which a conductor is exposed by peeling off the insulating coating on the distal end side of a covered electric wire in which a conductor is coated with an insulating coating, and an electric wire constituted by a coated distal end portion on the distal end side in the insulating coating. A connection structure in which a distal end portion and a crimping portion having a hollow cross section in a crimping terminal are crimped and connected, wherein the covered electric wire is formed of the above-described covered electric wire, and the electric wire inserted into the crimping portion and the crimping portion The elastic protrusions are provided at least at the position corresponding to the boundary of the crimping surface in the circumferential direction of the covering tip portion disposed between a pair of crimping blade dies facing each other across the crimping portion so as to crimp the tip portion. And a discontinuous shape in which the gap between the inner surface of the crimping portion and the outer surface of the insulating coating is divided so that the crimping portion and the wire tip portion cannot communicate in the longitudinal direction of the coating tip portion. Become The elastic protrusions by the compression of the crimp portion due to caulking by Uni the pair of crimping blades type, characterized in that the crimped connection to an elastically deformed state.

  The present invention is a wire harness in which the connection structure is mounted on a connector housing.

  Moreover, this invention is a connector which has arrange | positioned the said crimp terminal in the connection structure mentioned above in the connector housing.

  The present invention relates to a method of manufacturing a covered electric wire which is formed by covering a conductor with an insulating coating and crimping and connecting the tip end of an electric wire on the tip side with a crimping portion having a hollow cross section in a crimp terminal. A pair of the crimping blades in the circumferential direction of the insulating coating in a state where the crimping portion having a hollow cross section and the tip of the electric wire are crimped by a pair of crimping blade molds facing each other across the insulating coating. The part corresponding to the boundary part between the respective crimping surfaces of the mold is set as the part corresponding to the crimping surface boundary, and the insulation coating on the tip side is peeled off by a predetermined length at the end of the electric wire to expose the conductor. Forming an elastic protrusion projecting so as to be elastically deformed as the crimping portion is compressed at least at a location corresponding to the crimping surface boundary in the circumferential direction of the insulating coating at the wire tip portion. That an elastic projection forming step and performing in this order.

  The present invention relates to a method of manufacturing a covered electric wire which is formed by covering a conductor with an insulating coating and crimping and connecting the tip end of an electric wire on the tip side with a crimping portion having a hollow cross section in a crimp terminal. A pair of the crimping blades in the circumferential direction of the insulating coating in a state where the crimping portion having a hollow cross section and the tip of the electric wire are crimped by a pair of crimping blade molds facing each other across the insulating coating. A location corresponding to the boundary between the respective crimping surfaces of the mold is set as a location corresponding to the crimping surface boundary, and at least at the wire tip in the longitudinal direction of the wire, at least the location corresponding to the crimping surface in the circumferential direction of the insulation coating An elastic protrusion forming step of forming an elastic protrusion that protrudes so as to be elastically deformed with compression of the crimping portion, and the insulating coating on the distal end side of the electric wire distal end portion. A peeling step of peeled by a constant length of partial expose the conductors and performing in this order.

  The present invention relates to a conductor exposed portion in which a conductor is exposed by peeling off the insulating coating on the distal end side of a covered electric wire in which a conductor is coated with an insulating coating, and an electric wire constituted by a coated distal end portion on the distal end side in the insulating coating. A method for manufacturing a connection structure in which a tip end and a crimping portion having a hollow cross section in a crimping terminal are crimped and connected by a pair of crimping blade molds facing each other across the crimping portion. In the state where the wire tip portion is inserted into the crimping portion and the wire tip portion is inserted into the crimping portion, the wire tip portion is a circumference of the wire tip portion. The elastic protrusions in the direction are arranged between the pair of crimping blade dies so that the elastic projections are located at a position corresponding to the crimping surface boundary, and the crimping portion and the wire tip are crimped and connected by the pair of crimping blade dies. When Wherein the compression of the crimp portion crimping the wire tip, characterized in that elastically deforming said elastic projection.

  According to the present invention, it is possible to provide a covered electric wire, a connection structure, a wire harness, a connector, a covered electric wire, and a method for manufacturing the connection structure that can reliably prevent moisture from entering from the insulating coating side. it can.

External view of crimp terminal and wire tip. External view of electric wire with crimp terminal. Sectional drawing in the crimping | compression-bonding part of a crimping | compression-bonding part and insulation coating. Structure explanatory drawing of an electric wire front-end | tip part. Explanatory drawing of the formation method of an electric wire front-end | tip part. Explanatory drawing of the formation method which forms a surface uneven | corrugated | grooved part in the surface of the electric wire front-end | tip part. Explanatory drawing of the crimping | compression-bonding method which crimps and connects the front-end | tip part of an electric wire to a crimping | compression-bonding part. Sectional drawing which shows a mode that the electric wire front-end | tip part is crimp-connected to the crimping | compression-bonding part. The external view of the covered electric wire of 2nd Embodiment. The effect | action description of the electric wire with a crimp terminal of 2nd Embodiment. The structure explanation of the electric wire with a crimp terminal of a 3rd embodiment. The structure explanation of the electric wire with a crimp terminal of a 3rd embodiment. Sectional drawing which shows a mode that the electric wire front-end | tip part is crimp-connected to the crimping | compression-bonding part. Explanatory drawing of the formation method which forms a surface uneven | corrugated | grooved part in the surface of the electric wire front-end | tip part. The perspective view which shows the connection corresponding state of a female connector and a male connector. Structure explanatory drawing of the conventional electric wire with a crimp terminal.

An embodiment of the present invention will be described in detail with reference to the drawings.
In addition, the drawings used in the following description are schematic, and the relationship between the dimensions of each element may be different from the actual one, and the relationship between the dimensions is also between the drawings. Or parts with different ratios may be included. Further, in each drawing, the same or corresponding elements are denoted by the same reference numerals as appropriate, and in the following description, repeated description between the drawings is omitted as appropriate.

(First embodiment)
FIG. 1 is a perspective view of the crimp terminal 300 and the wire tip portion 200T of the first embodiment, and shows a state immediately before the wire tip portion 200T is inserted into the crimp terminal 300. FIG.
FIG. 2 is a perspective view of the terminal-attached wire tip portion 100T of the wire 100 with crimp terminal according to the first embodiment, FIG. 3A is a cross-sectional view taken along the line AA in FIG. 2, and FIG. FIG. 4 is a sectional view taken along line B-C-D in FIG. FIG. 4A is a side view of the wire tip portion 200T, and FIG. 4B is a front view of the wire tip portion 200T.

In the drawings described below, priority is given to ease of recognition, and the strands 210a of the aluminum conductor 210 are shown thicker than the actual one and the number of wires is reduced.
Further, in the following description, as shown in FIG. 1, the longitudinal direction X is a direction that coincides with the longitudinal direction of the covered electric wire 200 that crimps and connects the crimping part 322 and the axial direction of the crimping terminal 300, The width direction W corresponds to the width direction of the crimp terminal 300 and is a direction that intersects the longitudinal direction X in the plane direction. Further, in the longitudinal direction X, the side of the box part 310 with respect to the wire connection part 320 is defined as the front side (front end side), and conversely, the side of the wire connection part 320 with respect to the box part 310 is defined as the rear side (base end side). .

  As shown in FIG. 2, the electric wire 100 with a crimp terminal of the present embodiment is configured by connecting a covered electric wire 200 to a crimp terminal 300. That is, the distal end side wire tip portion 200 </ b> T of the covered wire 200 is crimped and connected to the crimp portion 322 of the crimp terminal 300.

The covered electric wire 200 to be crimped to the crimp terminal 300 is coated with the aluminum conductor 210 as an aluminum core wire formed by twisting a plurality of aluminum strands 210a, and has insulation and heat resistance, for example. , And an insulating coating 220 formed of an insulating coating material made of PVC (polyvinyl chloride) material.
The insulating coating 220 is formed with a predetermined thickness t220, for example, a thickness of 300 μm to 500 μm, as shown in a partially enlarged manner in FIG.

  The electric wire tip portion 200T is an aluminum conductor exposed portion 210T in which the insulating coating material forming the insulating coating 220 on the tip end side of the covered electric wire 200 is peeled to expose the aluminum conductor 210, and the rear side of the aluminum conductor exposed portion 210T. Thus, the insulating coating 220 includes a coating tip 220T that is crimp-connected to the crimp terminal 300 on the tip side.

  At least the coating tip 220T in the longitudinal direction X of the insulating coating 220 described above is provided with a plurality of elastic protrusions 221 projecting radially outward on the outer peripheral surface in the longitudinal direction X, and the outer peripheral surface of the coating tip 220T is An uneven shape is formed along the longitudinal direction X.

  Specifically, a plurality of elastic protrusions 221 are formed in each part at a predetermined interval in the longitudinal direction X of the coating tip 220T, and each elastic protrusion 221 is formed as a part of the insulating coating 220 with the insulating coating 220. It is integrally formed on the outer peripheral surface of the coating tip portion 220T with the same insulating coating material, and the entire circumference protrudes in an annular shape so as to be elastically deformed with respect to other portions in the longitudinal direction X of the coating tip portion 220T. Forming.

  As described above, the elastic protrusion 221 is elastic by forming a contiguous portion adjacent to the elastic protrusion 221 on the outer peripheral surface of the coating tip 220T formed with a thickness of 300 μm to 500 μm. The protrusion 221 is formed in a convex shape.

  That is, as shown in FIGS. 4A and 4B, by forming the groove portions 222 on both sides of the portion corresponding to the elastic protrusion 221 in the longitudinal direction X of the covering tip portion 220T, as shown in FIGS. An uneven surface portion 225 having an uneven shape in the longitudinal direction X is formed on the surface of 220T.

  The depth of the groove 222 is 30% to 60% of the thickness of the insulating coating 220 described above. Specifically, in the present embodiment, as shown in a partially enlarged view in FIG. 4A, for example, the groove 222 is formed with a depth (h221) of 100 μm. That is, the elastic protrusion 221 is formed so as to protrude with a height (h221) of 100 μm with respect to the groove 222 in the covering tip 220T.

Next, the above-described crimp terminal 300 will be described in detail.
The crimp terminal 300 is a female crimp terminal including a box portion 310 that allows insertion tabs to be inserted into a male crimp terminal (not shown) from the front, which is the front end side in the longitudinal direction X, to the rear. 310 and the electric wire connection part 320 are comprised integrally.

  The box part 310 is formed of an inverted hollow square column body, and is bent toward the rear in the longitudinal direction X and elastic contact pieces 310a that contact an insertion tab (not shown) of a male connector to be inserted. It has.

  Further, the box portion 310 which is a hollow quadrangular prism body is bent so that the side surface portions continuously provided on both side portions in the width direction W orthogonal to the longitudinal direction X of the bottom surface portion are overlapped, and viewed from the front end side in the longitudinal direction X. It is configured in a substantially rectangular shape.

The wire connection part 320 is integrally formed in a continuous shape that is continuous in the entire circumferential direction along the longitudinal direction X while arranging the sealing part 321 and the crimping part 322 in this order from the front to the rear.
The sealing part 321 corresponds to a transition part as a connecting part for connecting the box part 310 and the crimping part 322 in the longitudinal direction X, and pushes the front end part in a substantially flat plate shape with respect to the crimping part 322 in the wire connecting part 320. By deforming so as to be crushed, the front end portion of the electric wire connecting portion 320 is formed in a flat shape that overlaps with each other in the thickness direction.

  As shown in FIG. 1, the crimping portion 322 has a hollow cylindrical shape in which the opening portion on the front side is closed by the sealing portion 321 and only the opening portion 320Ab on the rear side is opened so as to insert the electric wire tip portion 200T. Is formed. The crimping portion 322 is formed in a continuous shape that continues from the front-side sealing portion 321 along the rear-side opening 320Ab320A in the entire circumferential direction.

  The crimping portion 322 is formed so as to surround not only the aluminum conductor exposed portion 210T but also the covering tip portion 220T of the wire tip portion 200T.

  Specifically, the crimping portion 322 is formed to have a length that allows the wire tip portion 200T to be inserted, and has an inner diameter that is slightly larger than the outer diameter of the covering tip portion 220T.

  In the present embodiment, as described above, the crimp terminal 300 is configured by the female crimp terminal including the box part 310 and the crimp part 322. However, if the crimp terminal has the crimp part 322, the above-described crimp terminal is used. Even a male crimping terminal constituted by an insertion tab (not shown) that is inserted and connected to the box part 310 of the terminal 300 and the crimping part 322 is constituted only by the crimping part 322, and the conductors 210 of the plurality of covered electric wires 200 are bundled and connected. For this purpose, a crimp terminal may be used.

Subsequently, a procedure for forming the surface uneven portion 225 provided with the elastic protrusion 221 on the outer peripheral surface of the coating tip portion 220T will be described with reference to FIGS. 5 and 6.
5 is an explanatory diagram of the process of forming the wire tip 200T. FIGS. 6 (a) and 6 (b) show the state immediately before and after the formation of the surface irregularity 225 on the outer peripheral surface of the coating tip 220T. It is explanatory drawing which showed the manufacturing method of the electric wire front-end | tip part 200T shown in the partial cross section.

The electric wire tip portion 200T is formed by performing the stripping and covering groove forming steps in this order.
In the stripping, the aluminum conductor 210 is peeled off by a predetermined length at the tip end portion of the covered electric wire 200 as shown in FIG. As a result, as shown in FIG. 5B, an aluminum conductor exposed portion 210 </ b> T exposed to the insulating coating 220 can be formed on the distal end side of the covered electric wire 200.

  In the covering grooving step, as shown in FIG. 6, the outer peripheral surface of the covering tip 220T is formed by thermal melting using a pair of heating pressing molds 500 including one heating pressing mold 500A1 and the other heating pressing mold 500A2. A surface uneven portion 225 is formed.

  The pair of heating and pressing dies 500 are formed so as to have a semicircular arc shape with a pressing surface 510A1 having a semicircular cross section in the longitudinal direction X so as to surround the coating tip 220T in a state of being opposed to each other. The concave portions 510A1a and the convex portions 510A1b are formed by uneven pressing surfaces 510A2 alternately arranged along the longitudinal direction X.

  As shown in FIG. 5B, between the pair of heating and pressing dies 500, with the one heating and pressing mold 500 </ b> A <b> 1 and the other heating and pressing mold 500 </ b> A <b> 2 facing each other. A suitable coating tip 220T is disposed. Furthermore, as shown in FIG. 6 (a), by moving at least one of the pair of heating and pressing dies 500A1 and 500A2, the pair of heating and pressing dies as shown in FIG. 6 (b). The coating tip 220T is pressed so as to be sandwiched by the mold 500.

  The pressing surface 510A1 having a concavo-convex shape in the pair of heating press dies 500 abuts on the outer peripheral surface of the coating tip portion 220T, so that the outer peripheral surface of the coating tip portion 220T corresponds to each pressing surface 510A1 of the pair of heating press dies 500. Melt so as to form an uneven shape.

  Thereby, as shown in FIG.5 (c), the surface uneven | corrugated | grooved part 225 which arrange | positioned the cyclic | annular elastic protrusion 221 for every predetermined interval in the longitudinal direction X can be formed in the surface of the coating | coated front-end | tip part 220T.

Subsequently, a procedure when the above-described crimp terminal 300 and the covered electric wire 200 are crimped and connected will be described with reference to FIGS. 7A, 7 </ b> B, and 8.
FIGS. 7A and 7B are explanatory views showing the states immediately before and immediately after the crimping portion 322 is crimped to the coating tip portion 220T in a longitudinal section. FIG. 8 is a cross-sectional view orthogonal to the longitudinal direction X showing a state where the pressure-bonding portion 322 is pressure-bonded to the coating tip portion 220T, and is a cross-sectional view taken along the line EE in FIG.

First, as shown in FIG. 7A from the state shown in FIG. 1, the wire tip portion 200 </ b> T of the covered electric wire 200 is inserted into the crimp portion 322 of the crimp terminal 300.
Then, as shown in FIG. 7 (a), each of a pair of crimping blade molds 600 consisting of a fixed crimping blade mold 600C (crimper) and a movable crimping blade mold 600A (anvil) is crimped with the wire tip 200T inserted. It arrange | positions so that the part 322 may be opposed on each side. In this state, as shown in FIG. 7B and FIG. 8, the crimping portion 322 is clamped by a pair of crimping blade molds 600, and the wire tip 200 T and the crimping portion 322 are crimped and connected. As shown in FIG. 2, the electric wire 100 with a crimp terminal can be constituted.

  When crimping and connecting the wire tip 200T and the crimping part 322, the compression rate of the crimping part 322 (cross-sectional area of the crimping part 322 after compression / cross-sectional area of the crimping part 322 before compression × 100) is 60%. It is set to a normal pressure bonding rate of ˜80%.

As described above, the effects of the covered electric wire 200 provided with the elastic protrusion 221 at the covered tip portion 220T and the electric wire 100 with the crimp terminal in which the crimp terminal 300 is crimped and connected to the covered electric wire 200 will be described.
As described above, by arranging the plurality of elastic protrusions 221 on the outer peripheral surface of the coating tip portion 220T, the compression rate by the crimping blade die 600 is increased in a state where the crimping portion 322 and the wire tip portion 200T are crimped and connected. Even in the crimp surface boundary equivalent portion 400Z that tends to be low (see FIG. 8), there is no gap between the crimp portion 322 and the coating tip portion 220T, and excellent water stoppage can be obtained.

  More specifically, when the crimping portion 322 and the coating tip 220T are crimped by the pair of crimping blade molds 600, a pair of crimping blades in the circumferential direction of the crimping portion 322 as the crimping portion 322 compressively deforms. In the portion where the molds 600 are engaged with each other, that is, the crimping surface boundary equivalent portion 400Z corresponding to the boundary portion between the crimping surfaces, the meat (forming material) of the crimping surface boundary equivalent portion 400Z is a pair of pieces as shown in FIG. It deforms outwardly so as to escape into the gap between the crimping surfaces 610 of the crimping blade mold 600. As a result, a burr 410 as an outer deformed deformed portion often occurs at the crimping surface boundary equivalent portion 400Z in the crimping portion 322.

As described above, in the crimping surface boundary equivalent portion 400Z where the burr 410 is generated in the crimping portion 322, the crimping portion 322 and the wire tip portion 200T are compared with other portions in the circumferential direction of the crimping portion 322 in a state where the crimping portion 322 is crimped. Thus, it is pressure-bonded to the coating tip 220T in a state where the compression rate is low.
On the other hand, the insulating coating 220 formed of the insulating coating material contracts due to the influence of the surrounding environment such as temperature and humidity.
Then, as shown in FIG. 16, in the case of the conventional electric wire 1000 with a crimp terminal in which the plurality of elastic protrusions 221 are not formed on the outer peripheral surface of the covering tip portion 2200T, the crimp portion 322 and the wire tip portion 2000T are crimped. In this state, the compression rate of the crimping surface boundary equivalent portion 400Z in the circumferential direction of the crimping portion 322 is lower than that of other portions.

  For this reason, the adhesiveness of the crimping part 322 with respect to the coating tip part 2200T is lowered at the crimping surface boundary equivalent part 400Z, and a gap S is easily generated between the crimping part 322 and the coating tip part 2200T (see FIG. 16). (See partially enlarged view).

  Thus, in the case of the conventional electric wire 1000 with a crimp terminal in which the gap S between the crimping part 322 and the covering tip part 2200T may be formed in the longitudinal direction X of the covering tip part 2200T, the crimping part 322 and the covering tip part A flow path (S) that communicates from the outside to the inside of the crimping part 322 is formed between the part 2200T and a problem arises that it is not possible to ensure water-stopping inside the crimping part 322. It was.

  On the other hand, in the present embodiment, at the outer peripheral surface of the coating tip 220T, an elastic bump is applied to at least the crimping surface boundary equivalent portion 400Z where the compression rate when the crimping portion 322 is compressed by the crimping blade mold 600 tends to be low. Since the portion 221 is formed, the elastic protrusion 221 is elastically deformed by receiving the compressive force from the crimping portion 322 at the crimping surface boundary equivalent portion 400Z in a state where the crimping portion 322 and the wire tip portion 200T are crimped and connected. By doing so, as shown in FIG. 7B and FIG. 8, the covering tip 220T is kept positively in close contact with the inner surface of the crimping portion 322 by utilizing the elastic force of the elastic protrusion 221. be able to.

  Therefore, as shown in FIGS. 3A and 3B, in the state where the crimping portion 322 and the wire tip portion 200T are crimped and connected by the crimping blade mold 600, the compression rate in the circumferential direction of the crimping portion 322 is lowered. Even in the crimping surface boundary equivalent portion 400Z, no gap is formed between the crimping portion 322 and the coating tip portion 220T, and excellent water stoppage can be obtained.

  By the way, in order to enhance the adhesion between the crimping part 322 and the wire tip part 200T, an engagement groove (on the inner peripheral surface of the crimping part 322 can be engaged with a contact part with the coating tip part 220T. A measure is taken to form serrations and to form the contact portions in an uneven shape.

  However, there are many crimp terminals 300 having a thickness of about 250 μm because of the recent demand for thinning. Temporarily, on the inner peripheral surface of the crimp portion 322 of the crimp terminal 300 having a thickness of about 250 μm, When serrations having a depth of 100 μm are formed, depending on the wire diameter, there is a possibility that the crimping part 322 may be damaged along with the compression when the crimping part 322 and the covering tip part 220T are crimped and connected. .

For this reason, the serration is limited to be formed at a depth of about 50 μm at most with respect to the crimping portion 322 of the crimping terminal 300, and must be formed shallowly.
Then, the serration formed on the inner circumferential surface of the crimping portion 322 cannot be sufficiently engaged with the outer circumferential surface of the coating tip portion 220T at the crimping portion where the crimping portion 322 and the coating tip portion 220T are crimped and connected. Further, there is a possibility that the water stoppage between the inner peripheral surface of the crimping portion 322 and the outer peripheral surface of the coating tip portion 220T cannot be sufficiently ensured.

  Furthermore, since the crimp terminal 300 is plated with Ni, Sn, etc., and a plating film is formed on the surface, the serration formation portion in the crimp part 322 is more uneven depending on the plating thickness. It becomes a shape. For this reason, the engagement force of the coating front end portion 220T due to serration is further weakened, and a situation has arisen in which the water stoppage between the inner peripheral surface of the crimping portion 322 and the outer peripheral surface of the coating front end portion 220T cannot be further ensured.

  On the other hand, in the present embodiment, an adjacent portion that is formed with a thickness (t220) of 300 μm to 500 μm and is adjacent to the portion corresponding to the elastic protrusion 221 on the outer peripheral surface of the coating tip portion 220T. By forming a concave shape with a depth (h221) of about 100 μm, as shown in FIG. 5C, a portion corresponding to the elastic protrusion 221 is formed in a protruding shape.

  That is, the elastic protrusion 221 can be formed by firmly protruding at a height (h221) of about 100 μm with respect to the groove 222 in the covering tip 220T.

  For this reason, in the crimping | compression-bonding location which crimped-connected the crimping | compression-bonding part 322 and the coating | coated front-end | tip part 220T, when receiving the compressive force from the crimping | compression-bonding part 322 and elastically deforming the elastic protrusion part 221, it can be firmly elastically deformed. By utilizing the excellent elastic force of the elastic protrusion 221, it is possible to keep the coated tip 220 </ b> T in a state of being in close contact with the inner surface of the crimping portion 322.

  In addition, as shown in the enlarged view of FIG. 4A, the groove 222 is formed at a depth (h221) of 100 μm with respect to the insulating coating 220 having a thickness (t220) of 250 μm, as described above. Yes. Therefore, as described above, the elastic protrusion 221 has a height (h221) of about 100 μm so that the elastic protrusion 221 itself can be firmly attached to the crimping part 322 by utilizing the excellent elastic force of the elastic protrusion 221 itself. The groove 222 can be formed at a depth (h221) of, for example, about 30% to 60% with respect to the thickness of the insulating coating 220.

  Therefore, even when the crimping portion 322 is normally crimped by about 60% to 80%, the coated tip portion 322 and the coated tip portion 220T are securely connected without being damaged by the compression of the crimped portion 322. Crimp connection is possible.

  Further, as shown in FIG. 8, when the pressure-bonding portion 322 is compressed and deformed by compression of the pressure-bonding portion 322 by the pressure-bonding blade mold 600, the compression rate is not uniform in the circumferential direction of the pressure-bonding portion 322. A portion where the compression rate is locally lowered occurs, such as the crimped surface boundary equivalent portion 400Z.

  On the other hand, in this embodiment, as shown in FIG. 1 and FIGS. 4 (a) and 4 (b), the elastic protrusion 221 has an annular shape that protrudes over the entire circumference of the covering tip 220T. Is formed. For this reason, in the state where the crimping portion 322 and the wire tip portion 200T are crimped and connected, even if a location where the compression rate is low in any place in the circumferential direction of the crimping portion 322 occurs, the compression rate is lowered. The elastic protrusion 221 can be securely attached to the place by utilizing the elastic force of the elastic protrusion 221.

  For this reason, in the state where the crimping part 322 and the wire tip part 200T are crimped and connected by the crimping blade mold 600, the crimping part 322 and the covering are covered over the entire circumferential direction of the crimping part between the crimping part 322 and the covering tip part 220T. It is possible to prevent a gap from being generated between the distal end portion 220T.

  Therefore, for example, like the conventional electric wire 1000 with a crimp terminal, a flow rate (S) that communicates in the longitudinal direction X is formed by locally reducing the compressibility in the circumferential direction of the crimp portion 322. In contrast to the fear, in the present embodiment, the flow path (S) can be reliably divided, so that excellent water stoppage can be obtained.

  In addition, since the coated electric wire 200 has a plurality of elastic protrusions 221 arranged in the longitudinal direction X on the surface of the coated tip portion 220T, the coated tip portion 220T is in a state where the crimp portion 322 and the wire tip portion 200T are crimped and connected. By utilizing the elastic force of the elastic protrusion 221 over a plurality of locations in the longitudinal direction X, excellent adhesion of the coated tip 220T to the inner surface of the crimping portion 322 can be obtained.

  For this reason, the groove part 222 formed between the elastic protrusions 221 is divided in the longitudinal direction X of the covered tip part 220T, and the covered electric wire 200 passes through the groove part 222 from the outside of the crimp part 322 to the crimp part 322. It is possible to reliably prevent water from flowing into the side of the aluminum conductor exposed portion 210 </ b> T included in the inside.

In the following, covered electric wires 200P2 and 200P3 provided with elastic protrusions 221P2 and 721 on the coated tip portions 200P2T and 200P3T in other embodiments, and an electric wire 100P2 with a crimp terminal in which the crimp terminal 300 is crimp-connected to the covered electric wires 200P2 and 200P3. , 100P3 will be described.
However, among the configurations of the covered wires 200P2 and 200P3 and the crimped terminal-attached wires 100P2 and 100P3 described below, the same reference numerals are given to the same configurations as those in the first embodiment described above, and the description thereof is omitted. To do.

(Second Embodiment)
As illustrated in FIG. 9, the covered electric wire 200 </ b> P <b> 2 according to the second embodiment has a difference in level between a first elastic protrusion 221 </ b> B and a second elastic protrusion 221 </ b> S having a smaller protrusion than the first elastic protrusion 221 </ b> B. A surface uneven portion 225P2 having a kind of elastic protrusion 221P2 is formed on the surface of the coated tip 220P2T.

  FIG. 9 is a side view of the wire tip portion 200P2T of the covered wire 200P2 in the second embodiment shown partially enlarged.

  The first elastic protrusions 221B are arranged at predetermined intervals along the longitudinal direction X of the covering tip 220P2T, and the second elastic protrusions 221S are arranged between the adjacent first elastic protrusions 221B. doing.

  The second elastic protrusion 221S is formed to protrude beyond the protrusion length of the first elastic protrusion 221B when the first elastic protrusion 221B is compressed and deformed until it reaches the plastic deformation region beyond the elastic deformation region. ing. Specifically, the second elastic protrusion 221S is formed so as to protrude from half of the protrusion length of the first elastic protrusion 221B.

  In addition, the second elastic protrusion 221S is disposed at a location that interferes with a portion that is compressed and deformed so that the first elastic protrusion 221B expands outward in the width direction due to elastic deformation.

  That is, the second elastic protrusion 221S directly contacts the first elastic protrusion 221B that is elastically deformed without being compressed and deformed in a state of being in contact with the inner peripheral surface of the pressure-bonding part 322. The protrusions 221 </ b> B are formed so as to be elastically deformed via the protrusions 221 </ b> B.

The effect of the electric wire 100P2 with the crimp terminal of the second embodiment in which the coated electric wire 200P2 of the second embodiment and the electric wire tip portion 200P2T on the distal end side of the covered electric wire 200P2 are crimped and connected to the crimp portion 322 of the crimp terminal 300 10 (a) and 10 (b) are used for explanation.
10A is a cross-sectional view showing a state in which the tip end side of the covered electric wire 200P2 is crimped to the crimping portion 322 of the crimp terminal 300 by compression of the crimping portion 322 by the crimping blade mold 600. FIG. FIG. 10B is an enlarged view of a portion X in FIG.

  As shown in FIG. 10A, when the electric wire tip portion 200P2T in the covered electric wire 200P2 of the second embodiment is crimped and connected to the crimp terminal 300, the crimp portion 322 is compressed and deformed by compression by the crimp blade type 600. At this time, as shown in FIG. 10B, the first of the first elastic protrusions 221B and the second elastic protrusions 221S formed on the outer peripheral surface of the covering tip 220P2T as the crimping part 322 is compressed. Only the elastic protrusion 221 </ b> B comes into contact with the inner peripheral surface of the crimping part 322 and is elastically deformed.

That is, the first elastic protrusions 221B arranged on both sides of the second elastic protrusion 221S in the longitudinal direction X of the covering distal end portion 220P2T compress so that the distal end side extends outward in the width direction compared to the proximal end side. The second elastic protrusion 221S is elastically deformed by being elastically deformed and being pressed by the first elastic protrusion 221B (see FIG. 10B).
At this time, the second elastic protrusion 221 </ b> S can elastically support the first elastic protrusion 221 </ b> B so that the first elastic protrusion 221 </ b> B is no longer elastically deformed and reaches the plastic deformation region from the elastic deformation region. .

  As a result, even if the first elastic protrusion 221B is elastically deformed as the crimping part 322 is compressed, the second elastic protrusion 221S compresses the first elastic protrusion 221B in the range of the elastic region as described above. It can be kept in deformation.

  Therefore, in a state where the wire tip portion 200P2T is crimped and connected to the crimp terminal 300, the insulation coating 220P2 is formed over time at a location where the compression rate in the circumferential direction of the crimp portion 322 is small due to external factors such as ambient temperature and humidity. Even when contracted, the elastic force of the first elastic protrusion 221B can be reliably utilized to keep the crimping part 322 and the covering tip part 220P2T in close contact with each other. There is no gap in the surface, and an excellent water stoppage can be obtained.

  In addition, by disposing the second elastic protrusions 221S between the plurality of first elastic protrusions 221B in the covering tip 220P2T, dust or the like can enter the gap between the adjacent first elastic protrusions 221B. The first elastic protrusion 221B can be prevented without causing a situation in which the elastic deformation of the first elastic protrusion 221B is hindered by the dust that has entered the gap between the adjacent first elastic protrusions 221B. The elastic deformation of can be reliably maintained.

  In addition, the electric wire front-end | tip part 200P2T in the covered electric wire 200P2 of 2nd Embodiment is through the 1st elastic protrusion 221B which elastically deformed the 2nd elastic protrusion 221S with the compression deformation of the crimping | compression-bonding part 322 as mentioned above. Are formed on the outer peripheral surface of the covering tip 220P2T one by one between the adjacent first elastic protrusions 221B so as to be elastically deformed, but the second elastic protrusion 221S is lower in height than the first elastic protrusion 221B. If it is, it does not specifically limit, You may form so that it may elastically deform by contact | abutting directly to the internal peripheral surface of the crimping | compression-bonding part 322, and it forms between adjacent 1st elastic protrusions 221B. In addition to the above, three or more types of elastic protrusions 221 having different heights may be formed, and can be formed at an arbitrary interval and protrusion amount.

(Third embodiment)
The covered electric wire 200P3 in the third embodiment includes an insulating covering attachment body 700 attached to the covering tip 220T, as shown in FIGS. 11 (a) and 11 (b) and FIGS. 12 (a) and 12 (b). Yes. The insulation coating mounting body 700 is formed of the same insulation coating material as the material of the insulation coating 220 and has flexibility, and has a cylindrical shape having an inner diameter substantially the same as or slightly smaller than the outer diameter of the insulation coating 220. Forming.
FIGS. 11A and 11B are a side view and a longitudinal sectional view, respectively, of the coating tip portion 220T of the third embodiment, and FIGS. 12A and 12B are respectively shown with respect to the coating tip portion 220T. It is an external view which shows a state before and after mounting | wearing the insulation coating mounting body 700. FIG.

On the outer peripheral surface of the insulating coating mounting body 700, a surface uneven portion 725 is formed in which a plurality of elastic protrusions 721 protruding in an annular shape are arranged along the longitudinal direction X at a predetermined interval.
That is, on the outer peripheral surface of the insulating covering mounting body 700, a groove 722 is formed in a portion between the portions corresponding to the elastic protrusions 721 in the longitudinal direction X, so that convex elastic protrusions are formed at the positions corresponding to the elastic protrusions 721. 721 is formed.
The insulating coating 220 is formed on the outer peripheral surface on which the above-described elastic protrusion 721 is not formed, as in the conventional insulating coating.

The effects of the covered electric wire 200P3 of the third embodiment and the electric wire tip portion 100P3 with the crimp terminal of the third embodiment will be described with reference to FIG.
13 is a cross-sectional view showing a state where the wire tip portion 200P3T in a state where the insulation coating mounting body 700 is inserted is crimped and connected to the crimping portion 322 of the crimping terminal 300 by compression of the crimping portion 322 by the crimping blade mold 600. is there.

  When the electric wire tip portion 200P3T in a state where the insulation coating attachment 700 is inserted into the sheath tip portion 220T is crimped and connected to the crimp terminal 300, the crimp portion 322 is compressed and deformed by the compression by the crimp blade type 600, and the crimp portion 322 is compressed. With the compression, the inner peripheral surface of the pressure-bonding portion 322 comes into contact with the elastic protrusion 721 in the covering tip portion 220T, and the elastic protrusion 721 is elastically deformed. At this time, the elastic protrusion 721 is compressed and deformed so that the flesh of the tip portion escapes outward in the width direction as it elastically deforms.

  Here, in a state where the insulating coating mounting body 700 is inserted into the coating tip portion 220T, the groove portion 722 of the insulating coating mounting body 700 has a groove portion 722 in the insulating coating mounting body 700 in addition to the thickness of the coating tip portion 220T itself. Therefore, the concave bottom surface of the groove portion 722 of the insulating coating mounting body 700 can obtain elasticity superior to that of the outer peripheral surface of the coating tip portion 220T.

  Therefore, even if the elastic protrusion 721 is elastically deformed due to the compression of the crimping part 322, the elastic deformed elastic protrusion 721 is further deformed by the concave bottom surface of the groove 722 of the insulating covering mounting body 700 to be in a plastic deformation region. The elastic protrusion 721 can be kept in compression deformation within the elastic range so as not to reach.

  Therefore, in a state where the wire tip portion 200P2T is crimped and connected to the crimp terminal 300, the insulation coating 220 is formed with time in a portion where the compression rate in the circumferential direction of the crimp portion 322 is small due to external factors such as ambient temperature and humidity. Even if contracted, the elastic force of the elastic protrusion 721 can be utilized to keep the crimping part 322 and the covering tip part 220T in close contact with each other, and a gap is generated between the crimping part 322 and the covering tip part 220T. And excellent water-stop properties can be obtained.

  Although not shown, the insulation coating mounting body 700 includes the first elastic projection 221B on the outer peripheral surface and the second coating projection 220P2T according to the second embodiment having the second elastic projection 221S lower than the first elastic portion. Similarly, a plurality of elastic protrusions 721 having different heights and widths may be formed on the outer peripheral surface.

  Further, the insulating coating mounting body 700 is formed of the same material as that of the insulating coating 220, but is not limited to this. For example, the insulating coating mounting body 700 is formed of a desired material different from that of the insulating coating 220 according to the elasticity of the elastic protrusion 721. Can do. Furthermore, the insulation coating mounting body 700 is not limited to being attached by being inserted into the coating front end portion 220T, and the mounting form with respect to the coating front end portion 220T is not particularly limited.

In the correspondence between the configuration of the present invention and the embodiment,
The conductor of the present invention corresponds to the aluminum conductor 210, and similarly,
The conductor exposed portion corresponds to the aluminum conductor exposed portion 210T,
Although the connection structure corresponds to the electric wires 100, 100P2 and 100P3 with crimp terminals, the present invention is not limited to the configuration of the above-described embodiment, and is applied based on the technical idea shown in the claims. And many embodiments can be obtained.

For example, as another embodiment, as a procedure for forming the surface uneven portion 225 provided with the elastic protrusion 221 on the outer peripheral surface of the covering tip portion 220T, for example, the wire tip portion 200T is shown in FIGS. ) And (c), the covering groove forming step and the skinning may be performed in this order.
In addition, FIG. 14 is explanatory drawing explaining the example of other embodiment of the process in which the electric wire front-end | tip part 200T is formed.

  Specifically, in the covered grooving step, as shown in FIG. 14B, the covered wire 200 as shown in FIG. 14A before the aluminum conductor exposed portion 210T is formed at the wire tip portion 200T. As described above, the surface uneven portion 225 having the elastic protrusion 221 is formed on the outer peripheral surface of the insulating coating 220 over the entire length in the longitudinal direction X.

  In the stripping process, the insulating coating 220 on the tip side is peeled off at the wire tip portion 200T as shown in FIG. 14B to form an aluminum conductor exposed portion 210T as shown in FIG. 14C.

  As described above, the procedure for forming the surface uneven portion 225 provided with the elastic protrusion 221 on the outer peripheral surface of the coating tip portion 220T is not limited to the procedure described with reference to FIG. 5, and is formed by various procedures and methods. can do.

  As another embodiment, although not shown in the drawing, the mold protrusion is formed on the inner surface, and the crimping part 322 is crimped and connected to the wire tip part 200T by a pair of crimping blade molds different from the above-described crimping blade mold 600. In this case, by pressing the pressure-bonding portion 322 from the outside with the mold protrusion, a substantially convex water-stop protrusion protruding toward the covering tip portion 220T may be formed on the inner surface of the pressure-bonding portion 322. Good.

  The mold protrusions are continuously formed on the inner surface of the crimping blade die without interruption along the circumferential direction, and a plurality of mold protrusions are formed at predetermined intervals in the longitudinal direction X.

  According to the above-described configuration, the water stop projection formed on the inner surface of the crimping portion 322 when the crimping portion 322 is crimped by the pair of crimping blade molds having the mold projection on the inner surface is the coating tip portion. The crimping portion 322 and the covering tip portion 220T can be brought into close contact with each other while being engaged with the elastic protrusion 221 disposed on the outer peripheral surface of the 220T.

  Therefore, the electric wires 100, 100P2, 100P3 with crimp terminals include only one of the serration formed on the inner surface of the crimp portion 322 and the elastic protrusion 221 disposed on the outer peripheral surface of the covering tip portion 220T. Compared with the case where it crimps | bonds, the improvement of a water stop can be aimed at.

  In addition, the pair of crimping blade molds having the mold protrusions on the inner surface includes a thin blade mold having a mold protrusion and a mold corresponding to a cover crimping portion for crimping the coating tip 220T in the crimping portion 322. In addition to a thin blade type that does not have a protrusion, the multiple thin blade types are stacked.

  For this reason, a pair of crimping blade dies provided with mold protrusions on the inner surface tends to be expensive because they require special processing during manufacturing.

On the other hand, according to the present embodiment, the pair of heating and pressing dies 500 described above used when forming the surface irregularities 225 on the outer peripheral surface of the coating tip 220T in the coating grooving step described above is a general-purpose blade mold. It can be manufactured at low cost.
Therefore, according to the present embodiment, since the surface uneven portion 225 can be easily formed on the outer peripheral surface of the coating tip portion 220T using the pair of heat pressing dies 500 manufactured at a low cost, the water stop is excellent. Further, the electric wires 100, 100P2, 100P3 with crimp terminals can be manufactured at low cost.

  In addition, the means for forming the surface uneven portion 225 on the surface of the covering tip 220T described above is not limited to the above-described configuration using the heating and pressing die 500, and may be formed by other means.

  For example, when the surface uneven portion 225 is formed on the outer peripheral surface of the coated tip portion 220T using a heating rolling roller (not shown) having an uneven shape on the outer peripheral surface, the outer peripheral surface of the heated heating roller is used as the coated tip portion. Press against the outer peripheral surface of 220T. The heated rolling roller arranged in parallel to the coated tip 220T in the pressed state is revolved while rotating around the axis of the coated tip 220T, so that the heated rolling roller is placed on the outer periphery of the coated tip 220T. The surface uneven | corrugated | grooved part 225 corresponding to the uneven | corrugated shape formed in the outer peripheral surface can be formed.

  In addition, as another means for forming the surface uneven portion 225 on the surface of the covering tip 220T, for example, when using a cutting tool such as a cutter (not shown), the elastic protrusion 721 has a height, width, etc. It can be formed at any location on the surface of the coating tip 220T with any cross-sectional shape included.

  In addition, as another means for forming the surface uneven portion 225 on the surface of the coating tip portion 220T, it may be formed by extrusion (drawing) processing with a die.

For example, when using a die (not shown) in which a plurality of linear grooves along the axial direction are formed on the inner peripheral surface, the coating tip 220T is pulled out while rotating relative to the die around the axis. A spiral surface uneven portion 225 can be formed on the outer peripheral surface of the tip portion 220T.
Furthermore, as another means for forming the surface uneven portion 225 on the surface of the coating tip portion 220T, a plurality of different processing methods described above may be combined.

  In addition, the elastic protrusions 221, 221 P 2, 721 are not limited to be formed to have a square or rectangular cross section so as to protrude with the same width in the protruding direction, but gradually decrease in width toward the tip. Thus, it may be formed to have a trapezoidal cross section or a triangle.

  Furthermore, although the elastic protrusion 221 is formed in a convex shape by forming an adjacent portion adjacent to the elastic protrusion 221 on the outer peripheral surface of the covering tip 220T, it is not limited thereto. The outer peripheral surface of the coating tip 220T may be formed so as to protrude so that the outer diameter of the insulating coating 220 in the portion having the elastic protrusion 221 is increased.

Furthermore, as shown in FIG. 15, the present embodiment may be configured as a connector in which the above-described electric wires with crimp terminals 100, 100 </ b> P <b> 2, 100 </ b> P <b> 3 are mounted inside the connector housing.
FIG. 15 is a perspective view of the connection state of the female connector 81 and the male connector 91. In FIG. 15, the male connector 91 is indicated by a two-dot chain line.

  The female connector housing 82 has a plurality of openings inside which the crimp terminals 300 can be mounted along the longitudinal direction X, and is formed in a box shape having a substantially rectangular cross section in the width direction W. A female connector 81 is provided by attaching a plurality of crimped terminal-attached electric wires 100, 100P2, and 100P3 configured by the above-described crimp terminal 300 along the longitudinal direction X to the inside of the female connector housing 82. The wire harness 80 is configured.

  Similarly to the female connector housing 82, the male connector housing 92 corresponding to the female connector housing 82 has a plurality of openings into which crimp terminals can be attached, and has a substantially cross-sectional shape in the width direction W. It is rectangular and is formed so as to be connectable to the female connector housing 82 in correspondence with the unevenness.

The male connector 91 is attached to the inside of such a male connector housing 92 by attaching along the longitudinal direction X electric wires 100, 100P2, 100P3 with crimp terminals, which are configured by male crimp terminals not shown. The provided wire harness 90 is configured.
The wire harness 80 and the wire harness 90 can be connected by fitting the female connector 81 and the male connector 91 together.

  Moreover, in the above-mentioned embodiment, although the core wire in the covered electric wire 200 was made into the aluminum conductor, it is not limited to this, The core wire which consists of copper, copper alloy, aluminum alloy, etc. may be sufficient.

100, 100P2, 100P3 ... Electric wire with crimp terminal 200, 200P2, 200P3 ... Covered wire 200T, 200P2T, 200P3T ... Wire tip 210 ... Aluminum conductor 210T ... Aluminum conductor exposed portion 220, 220P2 ... Insulation coating 220T, 220P2T ... Cover tip 221, 221P2, 721 ... elastic protrusion 221B ... first elastic protrusion 221S ... second elastic protrusion 222, 722 ... groove part 300 ... crimp terminal 322 ... crimp part 400Z ... crimping surface boundary equivalent point 600 ... a pair of crimp blade types 610 ... Crimp surface 700 ... Insulation coating attachment

Claims (14)

A wire tip composed of a conductor exposed part where the insulation coating on the tip side is peeled to expose the conductor and a coating tip part on the tip side of the insulation coating is crimped by a crimping part having a hollow cross section in the crimp terminal. A covered electric wire configured to be crimp-connected,
A covered electric wire provided with an elastic protrusion that protrudes so as to be elastically deformed along with compression of the crimping portion at least in a circumferential direction of the covering tip portion. The covered electric wire according to claim 1, wherein the elastic protrusion is formed over the entire circumference of the covered tip portion at least at a part in the longitudinal direction of the covered tip portion. A groove formed in a concave shape with respect to the elastic protrusion on the peripheral portion of the outer peripheral surface of the covering tip is discontinuous divided by the elastic protrusion in the longitudinal direction of the covering tip. The covered electric wire according to claim 1 or 2, which is formed into a shape. While providing a plurality of the elastic protrusions,
A first elastic protrusion and a second elastic protrusion having a smaller protrusion than the first elastic protrusion;
The covered electric wire according to any one of claims 1 to 3, wherein the second elastic protrusions are disposed between the first elastic protrusions adjacent in the longitudinal direction of the covering tip. 5. The covered electric wire according to claim 4, wherein the second elastic protrusion is formed so as to protrude beyond a protruding length of the first elastic protrusion that is compressed and deformed until reaching the plastic deformation region beyond the elastic deformation region. The covered electric wire according to claim 4 or 5, wherein the second elastic protrusion is formed so as to protrude more than half of the protruding length of the first elastic protrusion. In a state where the crimping part and the wire tip part are crimped by a pair of crimping blade molds facing each other across the coating tip part, the crimping of each of the pair of crimping blade molds in the circumferential direction of the coating tip part Set the location corresponding to the boundary between the surfaces to the location corresponding to the crimping surface boundary,
7. The elastic projection according to claim 1, wherein the elastic protrusion is formed at least at a location corresponding to the pressure-bonding surface boundary on the outer peripheral surface of the covering tip so as to be convex with respect to a peripheral portion of the pressure-bonding surface boundary. The covered electric wire according to Crab Provided with an insulating coating mounting body mounted on the outer peripheral surface of the coating tip portion at the coating tip portion;
The covered electric wire according to any one of claims 1 to 6, wherein the elastic protrusion is formed on an outer peripheral surface of the insulating covering mounting body. A conductor exposed portion where the conductor is exposed by peeling off the insulating coating on the coated wire in which the conductor is coated with an insulating coating; and a wire tip configured by a coated tip on the leading end side of the insulating coating; A connection structure in which a crimped portion having a hollow cross section in a crimp terminal is crimped and connected,
The covered electric wire is formed with the covered electric wire according to claim 7,
At least in the circumferential direction of the covering tip portion disposed between a pair of crimping blade dies facing each other across the crimping portion so as to crimp the crimping portion and the wire tip portion inserted into the crimping portion. While arranging the elastic protrusion at the location corresponding to the crimping surface boundary,
The crimping part and the wire tip part,
The crimping associated with caulking by the pair of crimping blade molds so that a gap between the inner surface of the crimping portion and the outer surface of the insulating coating becomes a non-continuous shape in which the gap between the inner ends of the sheathing portions cannot be communicated in the longitudinal direction. A connection structure in which the elastic protrusions are crimped and connected in a state where the elastic protrusions are elastically deformed by compression of the portions. A wire harness in which the connection structure according to claim 9 is mounted on a connector housing. The connector which has arrange | positioned the said crimp terminal in the connection structure of Claim 9 in the connector housing. A method of manufacturing a covered electric wire that is formed by covering a conductor with an insulating coating and forming a wire tip portion on the tip side so as to be crimped and crimped by a crimping portion having a hollow cross section in a crimp terminal,
Each of the pair of crimp blade types in the circumferential direction of the insulation coating in a state where the crimp portion having a hollow cross section and the wire tip portion are crimped by a pair of crimp blade types opposed to each other across the insulation coating. Set the location corresponding to the boundary between the crimping surfaces to the location corresponding to the crimping surface boundary,
A peeling step of peeling the insulating coating on the tip side by a predetermined length at the tip of the electric wire to expose the conductor;
An elastic protrusion forming step of forming an elastic protrusion protruding so as to be elastically deformed with compression of the pressure-bonding part at least at a position corresponding to the boundary of the pressure-bonding surface in the circumferential direction of the insulation coating at the wire tip. The manufacturing method of the covered electric wire performed in order. A method of manufacturing a covered electric wire that is formed by covering a conductor with an insulating coating and forming a wire tip portion on the tip side so as to be crimped and crimped by a crimping portion having a hollow cross section in a crimp terminal,
Each of the pair of crimp blade types in the circumferential direction of the insulation coating in a state where the crimp portion having a hollow cross section and the wire tip portion are crimped by a pair of crimp blade types opposed to each other across the insulation coating. Set the location corresponding to the boundary between the crimping surfaces to the location corresponding to the crimping surface boundary,
An elastic protrusion that protrudes at least at the tip of the electric wire in the longitudinal direction of the electric wire and at least at a position corresponding to the boundary of the pressure-bonding surface in the circumferential direction of the insulating coating so as to be elastically deformed as the crimping part is compressed. Part forming step;
A method of manufacturing a covered electric wire, in which a stripping step of peeling the insulating coating on the front end side by a predetermined length at the front end portion of the electric wire to expose the conductor is performed in this order. A conductor exposed portion where the conductor is exposed by peeling off the insulating coating on the coated wire in which the conductor is coated with an insulating coating; and a wire tip configured by a coated tip on the leading end side of the insulating coating; A method of manufacturing a connection structure in which a crimping portion having a hollow cross-section in a crimping terminal is crimped and connected by a pair of crimping blade molds facing each other across the crimping portion,
The covered electric wire is a covered electric wire manufactured by the manufacturing method according to claim 12 or 13,
Insert the wire tip into the crimping section,
In a state where the wire tip portion is inserted into the crimping portion, the pair of crimping blade molds is arranged such that the elastic projection in the circumferential direction of the wire tip portion is located at a location corresponding to the crimping surface boundary. Placed between
Manufacture of a connection structure that, when the crimping portion and the wire tip end are crimped and connected by the pair of crimping blade molds, the wire tip is crimped by compression of the crimping portion to elastically deform the elastic protrusion. Method.

Images