JP2018120729A - Crimp contact and crimp connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crimp terminal capable of suppressing the insulating coating in a coated crimping portion from being extruded to the outside of the coated crimping portion by a crimped coated crimping portion. A crimp terminal 100 of the present invention is a crimp terminal 100 having a crimp portion 130 crimped to one end of a coated electric wire 200 whose outer periphery is coated with an insulating coating 202. The 130 has a coated crimping portion 131 which is formed in a tubular shape and is crimped to the outer periphery of the insulating coating 202 with one end of the insulating coating 202 inserted therein, and an inner diameter smaller than the inner diameter of the covering crimping portion 131. The inside of the coating crimping portion 131 is provided with a conductor crimping portion 132 that is formed in a tubular shape and is crimped to the outer periphery of the electric wire conductor 201 with the electric wire conductor 201 exposed from one end of the insulating coating 202 inserted therein. The peripheral surface 131a is provided with a recess 135 recessed with respect to the inner peripheral surface 131a. [Selection diagram] Fig. 2

Description

  The present invention relates to a crimp terminal and a crimp connection structure used for, for example, a connector of an automobile wire harness.

An electrical equipment equipped in an automobile or the like constitutes an electrical circuit by being connected to another electrical equipment or a power supply device via a wire harness in which covered electric wires are bundled. At this time, the wire harness and the electrical equipment and the power supply device are connected to each other by connectors attached thereto.
Each of these connectors has a crimp terminal that is crimped and connected to a covered electric wire inside, and is configured to fit a female connector and a male connector that are connected corresponding to the unevenness.

  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. And when moisture penetrates into the connector through 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.

Accordingly, various techniques for preventing moisture from entering the wire conductor crimped by the crimp terminal have been proposed.
For example, the crimping terminal described in Patent Document 1 integrally includes a cylindrical conductor crimping portion that crimps a wire conductor of a covered electric wire and a cylindrical coated crimping portion that crimps an insulating coating of the covered wire in an integrated manner. In a closed barrel type crimp terminal with a cylindrical crimp part, with the tip of the coated wire inserted inside the crimp part, the coated crimp part is crimped around the outer periphery of the tip of the insulation coating and insulated. The conductor crimping portion is crimped to the outer periphery of the wire conductor exposed from the tip of the wire.

  In this way, by crimping the coating crimping part on the outer periphery of the tip of the insulation coating, the pressure between the coating crimping part and the insulation coating is increased, and the repulsive force of the crushed insulation coating causes the coating crimping part to By preventing moisture from entering the inside of the crimping portion from between the insulating coating and the insulation coating, moisture is prevented from entering the wire conductor.

Japanese Patent Laid-Open No. 2006-46171

  However, in the crimp terminal described in Patent Document 1, the insulation coating in the coated crimp portion is pushed out of the coated crimp portion by the crimped coated crimp portion, and as a result, between the coated crimp portion and the insulating coating. There is a possibility that the waterproofness between the coated crimping portion and the insulating coating is lowered due to a decrease in pressure.

  In view of the above-described problems, the present invention can suppress the insulation coating in the coated crimped portion from being pushed out by the crimped coated crimped portion to the outside of the coated crimped portion, and has excellent waterproofness and a crimp terminal. An object is to provide a connection structure.

  The present invention relates to a crimp terminal including a crimping portion that is crimped to one end of a covered electric wire whose outer periphery is covered with an insulating coating, and the crimping portion is formed in a cylindrical shape, and the insulation is formed inside A coated crimping portion that is crimped to the outer periphery of the insulating coating in a state in which one end of the coating is inserted, and a cylindrical shape having an inner diameter smaller than the inner diameter of the coated crimping portion, and the one end of the insulating coating inside A conductor crimping portion that is crimped to the outer periphery of the wire conductor in a state where the wire conductor exposed from the portion is inserted, and the inner peripheral surface of the covering crimping portion is recessed with respect to the inner peripheral surface The crimp terminal is provided with a recess.

  According to the present invention, since the concave portion recessed with respect to the inner peripheral surface is provided on the inner peripheral surface of the coated crimp portion, the friction on the inner peripheral surface of the coated crimp portion can be increased. As a result, when the coated crimping part is crimped to the outer periphery of the insulation coating of the coated electric wire, it is possible to suppress the insulation coating in the coated crimping part from being pushed out of the coated crimping part by the concave portion on the inner peripheral surface. The pressure between the coated crimping part and the insulating coating can be increased, and the waterproofness between the coated crimped part and the insulating coating can be improved.

  Furthermore, even if the pressure between the coated crimping part and the insulation coating increases, the crimp terminal receives an external force, or the linear expansion difference occurs between the coated crimping part and the insulating coating due to the atmospheric temperature level. The adhesion between the coated crimping part and the insulation coating can be maintained, which improves the waterproofness between the coated crimping part and the insulation coating even in harsh usage environments such as when the ambient temperature changes greatly. Can be made.

  In addition, since the inner diameter of the conductor crimping part is smaller than the inner diameter of the coated crimping part, when one end of the covered electric wire is inserted into the crimping part, the coated crimping part can be easily positioned on the outer periphery of the insulation coating of the coated electric wire. Thus, the range in which the concave portion is provided on the inner peripheral surface of the coated crimping portion can be limited to the minimum necessary level.

As an aspect of the present invention, a plurality of the recesses may be arranged at intervals in the circumferential direction on the inner peripheral surface of the covering crimping portion.
According to the present invention, the insulating coating of the covered electric wire can be effectively bited into the concave portion, and thereby the insulating coating can be further suppressed from being pushed out of the coated crimping portion.

Further, as an aspect of the present invention, on the inner peripheral surface of the coated crimping portion, a plurality of the concave portions arranged in a row along the circumferential direction are arranged in the axial direction of the crimping terminal. A plurality of rows may be provided at intervals.
By this invention, since the range in which the concave portion is provided on the inner peripheral surface of the coated crimping portion spreads in a planar shape, the insulating coating of the coated electric wire can be bitten into the concave portion in the range spread in the planar shape, It is possible to further suppress the insulating coating from being pushed out of the coated crimping portion.

Moreover, as an aspect of the present invention, among the adjacent rows in the plurality of rows, each of the recesses in one row overlaps with an interval between the adjacent recesses in the other row when viewed from the axial direction. It may be provided in a state.
In addition, if the recesses in the adjacent rows are linearly arranged along the axial direction of the crimp terminal, moisture may pass along the path passing through the recesses arranged in a straight line. The waterproofness between the insulation coating and the insulation coating may be reduced.

  According to the present invention, it is possible to prevent the recesses in adjacent rows from being linearly arranged along the axial direction of the crimp terminal, thereby improving the waterproofness between the coated crimp portion and the insulating coating. it can.

Further, as an aspect of the present invention, each of the recesses of the one row is provided in a state where it partially overlaps at least one of the recesses on both sides of the interval as viewed from the axial direction. The length in the circumferential direction of each of the recesses in the one row is a first length, and the length of the overlap between each of the recesses in the one row and one of the recesses on both sides of the interval is the other. Are the second length and the third length, respectively, and the sum of the second length and the third length may be 50% or less of the first length.
In addition, when there is no overlap between each of the recesses of the one row and one of the recesses on both sides of the interval, the second length and the third length are each zero.

According to the present invention, since the sum of the second length and the third length is 50% or less of the first length, the interval where the concave portions of one row overlap is set between the coated crimping portion and the coated wire. The interval can be set to ensure waterproofness.
When the sum of the second length and the third length exceeds 50% of the first length, the interval becomes too narrow and the above partial overlap becomes too large, whereby the axial direction of the crimp terminal is increased. A path through which moisture passes along is easily formed, and the waterproofness between the coated crimping portion and the insulating coating decreases.

Moreover, as an aspect of the present invention, the total occupied area of the concave portions provided on the inner peripheral surface of the coated crimping portion may be less than 50% of the area of the inner peripheral surface.
According to the present invention, it is possible to sufficiently ensure the contact area between the outer peripheral surface of the insulating coating of the coated electric wire and the inner peripheral surface of the coated crimping portion, thereby improving the waterproofness between the coated crimping portion and the insulating coating. be able to. Moreover, it can also suppress that a coating | bonding crimping | compression-bonding part is distorted.

Further, as an aspect of the present invention, the inner circumferential surface of the covering crimping portion is provided with the recess in at least a predetermined section in the circumferential direction, and the predetermined section provided with the recess is the covering crimping Of the inner peripheral surface of the part, the insulating coating may be provided in a region where the insulating coating is compressed at a relatively low compressibility compared with other regions and is crimped to the outer periphery of the insulating coating.
In addition, the said area | region is an area | region corresponding to the joint line of a crimping | compression-bonding die among the internal peripheral surfaces of a covering crimping | compression-bonding part, for example, when crimping a crimping | compression-bonding part with a crimping | compression-bonding die.

  According to the present invention, it is possible to increase the frictional resistance between the insulating coating and the coated crimping portion in a predetermined section by the concave portion, thereby suppressing the insulation coating from being pushed out from the coated crimping portion, which is relatively low. Even in a region compressed (weakly) at a compression rate, the waterproofness between the insulating coating and the coated crimping portion can be enhanced.

  If the crimping part is crimped with a crimping die, a gap is formed on the inner surface of the crimping die at the joint of the crimping mold. Becomes weaker. Thus, in the portion where the pressure to the crimping part by the crimping die is weak (that is, the joint), the frictional resistance between the crimping part and the insulating coating is lowered, and the insulating coating is pushed out from the coated crimping part, The waterproofness between the coated crimping portion and the insulating coating may be reduced.

According to the present invention, a concave portion can be provided in the region, and the concave portion can suppress the insulating coating from being pushed out from the coated crimping portion, thereby improving the waterproofness between the coated crimping portion and the insulating coating. it can.
More specifically, when the crimping part is crimped with a crimping die, the predetermined section is defined as a region corresponding to the joint of the crimping mold on the inner peripheral surface of the coated crimping part (that is, the insulation coating of the coated wire). The area corresponding to the joint of the crimping die on the inner peripheral surface of the coated crimping part when crimping with the crimping die by providing it at a relatively low compression rate and crimping to the outer circumference of the insulation coating A recessed portion can be disposed on the surface, and the recessed portion can prevent the insulating coating from being pushed out from the coated crimping portion, thereby improving the waterproofness between the coated crimping portion and the insulating coating.

  As an aspect of the present invention, the concave portion provided in the predetermined section may be formed longer in the circumferential direction than the concave section provided in a section other than the predetermined section.

  According to the present invention, the concave portion can be reliably formed so as to overlap the joint of the crimping die.

Further, the present invention is a crimp connection structure including a coated electric wire whose outer periphery is covered with an insulating coating, and a crimp terminal which is the above-described crimp terminal and is crimped to one end of the coated electric wire. It is characterized by that.
According to the present invention, a crimp connection structure having the above-described crimp portion can be obtained.

Moreover, as an aspect of the present invention, the thickness of the portion crimped by the coating crimp portion in the insulating coating may be larger than the depth of the recess.
In addition, the thickness of the part crimped by the coating crimping part in the insulating coating is the thickness of the smallest part of the distance between the outer peripheral surface of the covered electric wire and the electric wire conductor.

  According to the present invention, when the covered electric wire is pulled from the crimp terminal, it is possible to prevent the portion of the insulating coating that has bite into the recess from being torn off. In addition, since the portion of the insulating coating that bites into the concave portion is sufficiently strongly pressed against the entire inner surface (inner peripheral surface and bottom surface) of the concave portion, the degree of adhesion between the concave portion and the insulating coating is increased, and the insulation crimping portion and the insulating crimping portion are insulated. Waterproofness between the coating and the coating can be improved.

Further, as an aspect of the present invention, a convex portion is formed along the axial direction of the crimp terminal on the outer circumferential surface of the coated crimp portion, and at least the convex portion of the inner circumferential surface of the coated crimp portion. The said recessed part may be provided in the corresponding location.
By this invention, a recessed part can be provided in the location corresponding to the convex part provided in the outer peripheral surface of the coating | compression-bonding crimping part, and, thereby, the waterproofness between a coating crimping | compression-bonding part and insulation coating can be improved.

  According to the present invention, it is possible to improve the waterproofness between the coated crimping portion and the insulating coating by suppressing the insulating coating in the coated crimped portion from being pushed out of the coated crimped portion by the crimped coated crimped portion. The crimp terminal and crimp connection structure which can be provided can be provided.

The external appearance perspective view which shows the external appearance from the upper direction in a covered electric wire and a crimp terminal. AA arrow sectional drawing of FIG. The expanded view which expand | deployed the inner peripheral surface of the crimping | compression-bonding part. (A) is sectional drawing explaining the crimping | compression-bonding process which crimps | bonds a crimping | compression-bonding part to a covered electric wire using a crimping | compression-bonding metal mold | die, (b) is BB arrow sectional drawing of (a). (A) is sectional drawing which shows the cross-sectional shape of a crimping connection structure, (b) is an enlarged view of the range U1 of (a), (c) is an enlarged view of the range U2 of (a). The expanded view which shows the arrangement | sequence of a recessed part, and the modification of a shape. The expanded view which shows the other modification of the arrangement | sequence and shape of a recessed part. The expanded view which shows the other modification of the arrangement | sequence and shape of a recessed part. The expanded view explaining the relationship between the internal peripheral surface of a coating crimping part, and the sum total of the occupation area of a recessed part. The expanded view when a recessed part is provided only in the predetermined area in the internal peripheral surface of a coating | compression-bonding part. Sectional drawing which shows the state by which the crimping | compression-bonding part was crimped | bonded to the outer periphery of the covered electric wire using the crimping | compression-bonding die. The expanded view when a recessed part is provided in the predetermined area and areas other than this area in the inner peripheral surface of a coating | bonding crimping | compression-bonding part. (A) is sectional drawing which shows the cross section of the part crimped by the crimping | compression-bonding part in a covered electric wire, (b) Sectional drawing which shows the cross section of the part which is not crimped by the crimping part in a covered electric wire.

(Embodiment)
An embodiment of the present invention will be described below with reference to the drawings.
The configuration of the covered electric wire 200 and the crimp terminal 100 in the present embodiment will be described in detail with reference to FIGS.
1 shows an external perspective view of the covered electric wire 200 and the crimp terminal 100 from above, FIG. 2 shows a cross-sectional view taken along the line AA in FIG. 1, and FIG. The developed view is shown.

  In FIG. 1, an arrow X indicates the axial direction of the crimp terminal 100 (hereinafter referred to as “terminal axial direction X”), and an arrow Y indicates the width direction of the crimp terminal 100 (hereinafter referred to as “width direction Y”). ”). Further, in the terminal axis direction X, a box part 110 side (left side in the figure) described later is defined as the front, and a covered electric wire 200 side (right side in the figure) described later with respect to the box part 110 is defined as the rear.

As shown in FIGS. 1 and 2, the covered electric wire 200 is coated with an insulating coating 202 formed of an insulating resin on the outer periphery of a wire conductor 201 configured by bundling a plurality of aluminum wires or aluminum alloy wires. Configured. Specifically, the electric wire conductor 201 is formed by twisting a plurality of aluminum strands so that the cross section becomes, for example, 0.75 mm ² . Furthermore, the covered electric wire 200 exposes the wire conductor 201 having a predetermined length from the tip of the insulating coating 202.

  The crimp terminal 100 is, for example, a female terminal, and a box part 110 into which a male tab of a male terminal (not shown) is inserted from the front to the rear in the terminal axial direction X, and a transition part on the rear side of the box part 110. It is integrally formed with a crimping portion 130 that is provided via 120 and is crimped to the outer periphery of one end of the covered electric wire 200. The crimp terminal 100 is not limited to a female terminal, and may be a male terminal having a male tab instead of the box part 110, or a terminal such as a round terminal.

  The crimp terminal 100 is formed by punching a copper alloy strip (not shown) such as brass whose surface is tin-plated into a flat plate-shaped terminal-shaped plate material, and then forming a rectangular cylindrical box portion 110 and a stepped cylindrical shape. This is a closed barrel type crimp terminal that is bent into a three-dimensional terminal shape composed of the crimp portion 130 and that closes the front end opening of the crimp portion 130. In addition, said copper alloy strip may be plated with metals other than tin, and does not need to be plated. Moreover, the metal strip formed with metals other than copper may be used instead of a copper alloy strip.

  The box part 110 bends one of the side surface parts 112 continuously provided on both sides in the width direction Y orthogonal to the terminal axis direction X of the bottom surface part 111 so as to overlap the other upper end part. It is composed of a substantially rectangular hollow quadrangular column viewed from the front side.

  Further, an elastic contact piece 113 that contacts an insertion tab (not shown) of a male terminal inserted into the box portion 110 is provided inside the box portion 110. The elastic contact piece 113 is formed by extending a front end portion in the terminal axis direction X of the bottom surface portion 111 and bending it toward the rear in the terminal axis direction X.

  The crimping part 130 is connected in a continuous manner to the front side of the coated crimping part 131 and a cylindrical coated crimping part 131 that is crimped to the outer periphery of one end part of the insulating coating 202 of the coated electric wire 200. A cylindrical conductor crimping part 132 to be crimped to the outer periphery of the exposed wire conductor 201 and a front side of the conductor crimping part 132 are connected in a continuous manner and are crushed in the vertical direction to close the front end opening of the conductor crimping part 132 The crushing cylindrical sealing part 133 to be provided is provided.

  The inner diameter of the conductor crimping part 132 is smaller than the inner diameter of the coated crimping part 131 and smaller than the outer diameter of the insulating coating 202. The conductor crimping part 132 is connected to the front end opening of the covering crimping part 131 through the step part D in a continuous manner. The step portion D is provided in an annular shape along the boundary between the inner peripheral surface 131a of the covering crimping portion 131 and the inner peripheral surface 132a of the conductor crimping portion 132, and is located on the inner side of the inner peripheral surface 131a of the covering crimping portion 131. While projecting, the projecting portion 132 projects outward from the inner peripheral surface 132a of the conductor crimping portion 132.

  As shown in FIG. 3, a recess 135 for increasing the friction of the inner peripheral surface 131a is provided on the inner peripheral surface 131a of the cover crimping portion 131 in a state of being depressed with respect to the inner peripheral surface 131a. The recesses 135 form, for example, a row continuously extending along the circumferential direction Q of the inner peripheral surface 131a, and are provided in a plurality of rows (for example, 4 rows) spaced apart from each other along the terminal axis direction X. Yes. In FIG. 3, the recesses 135 are provided in a plurality of rows along the terminal axis direction X, but only one row may be provided.

  Moreover, as shown in FIG. 3, the inner peripheral surface 132a of the conductor crimping portion 132 is provided with a recess 136 for the electric wire conductor 201 to bite into the inner peripheral surface 132a. The recesses 136 are formed in a localized shape (for example, a rectangular shape in plan view) locally limited in the terminal axis direction X and the circumferential direction Q on the inner peripheral surface 132a, and are spaced apart from each other along the circumferential direction Q. A plurality of rows are arranged to form a row, and a plurality of rows are provided along the terminal axis direction X at intervals.

  As shown in FIGS. 1 and 2, the crimping portion 130 is formed by bending a portion to be the crimping portion 130 in a plate material (that is, a copper alloy strip) punched into a flattened terminal shape as follows. The That is, the coated crimping portion 131 of the crimped portion 130 is rounded so that the portion that becomes the coated crimped portion 131 of the flat plate-like terminal material becomes a cylindrical shape having a diameter that surrounds the outer periphery of one end portion of the coated electric wire 200. The conductor crimping part 132 of the crimping part 130 is rounded so that the portion to be the conductor crimping part 132 in the terminal-shaped plate material developed in a plane becomes a cylindrical shape with a diameter surrounding the outer periphery of the electric wire conductor 201. The sealing part 133 of the crimping part 130 is formed by overlapping the part that becomes the sealing part 133 in the flat plate-shaped terminal-shaped plate material so that the first half is flat and the second half is curved. The And the both ends of the circumferential direction Q of the part which becomes the crimping | compression-bonding part 130 bent in this way are welded along the welding part W1 extended in the terminal-axis direction X in the state which faced each other, and in the sealing part 133 The crimping part 130 is formed by welding along the welding location W2 along the direction crossing the terminal axis direction X.

  Next, the step of crimping the crimping portion 130 of the crimp terminal 100 having such a configuration to the outer periphery of the covered electric wire 200 and the crimping connection structure 1 after crimping will be described in detail with reference to FIGS. 4 and 5. To do.

  4A is a cross-sectional view showing a crimping process in which the crimping portion 130 is crimped to one end portion of the covered electric wire 200 using the crimping die 10, and FIG. 4B is a cross-sectional view of FIG. -B shows a cross-sectional view, FIG. 5 (a) shows a cross-sectional view of the cross-sectional shape of the crimp connection structure 1, and FIG. 5 (b) and FIG. 5 (c) show the range U1 in FIG. 5 (a), respectively. And an enlarged view of U2.

  As shown in FIG. 4A, the covered electric wire 200 from which the wire conductor 201 is exposed from the rear is inside the crimp portion 130 of the above-described crimp terminal 100, and one end portion of the insulating coating 202 is inside the crimp portion 130. Insert until it bumps into the stepped portion D protruding. In a state where one end portion of the insulating coating 202 abuts against the stepped portion D, the one end portion side of the insulating coating 202 is disposed inside the coating crimping portion 131 and the electric wire conductor 201 exposed from the one end portion of the insulating coating 202 is a conductor. It is arranged inside the crimping part 132.

  Thereafter, as shown in FIGS. 4 (a) and 4 (b), the crimping portion 130 into which the covered electric wire 200 is inserted is sandwiched between a pair of crimping molds 10 each composed of an anvil and a crimper, thereby covering the It crimps | bonds to the outer periphery of the one end part of the electric wire 200. FIG.

  The one set of crimping dies 10 includes a first crimping die 11 that becomes an anvil and a second crimping die 12 that becomes a crimper. The upper surface 11a of the first pressure-bonding die 11 is formed in a shape (for example, a concave curved surface shape) corresponding to the lower portion of the outer peripheral surface of the pressure-bonding part 130 after pressure bonding. A groove 12a having an inverted U-shaped cross section is provided on the lower surface of the second crimping die 12, and the bottom surface 12b of the groove 12a has a shape corresponding to the upper half of the outer peripheral surface of the crimped portion 130 after crimping (for example, a concave curved surface shape). ).

  A crimping connection structure in which the crimping portion 130 is crimped to the outer periphery of one end portion of the covered electric wire 200 by sandwiching and crimping the crimping portion 130 into which the covered electric wire 200 is inserted by such a set of crimping dies 10. 1 is configured.

  Specifically, as shown in FIG. 5, the crimping connection structure 1 can be conducted by crimping the conductor crimping part 132 and the electric wire conductor 201 by crimping the conductor crimping part 132 with the crimping die 10. It is connected to the. In the crimped state, the concave portion 136 of the conductor crimping portion 132 is pressed against the outer periphery of the electric wire conductor 201, the electric wire conductor 201 bites into the concave portion 136, and the oxide film of the aluminum strand is broken at the edge (corner portion) of the concave portion 136. Thus, conduction between the conductor crimping portion 132 and the electric wire conductor 201 is ensured.

  Furthermore, the crimping portion 131 and the insulating coating 202 are crimped by crimping the sheathing crimping portion 131 with the crimping die 10. In the crimped state, the coated wire 200 is elastically compressed in the radial direction by the coated crimping portion 131 so that the inner peripheral surface of the coated crimped portion 131 and the outer peripheral surface of the insulating coating 202 are in close contact with each other. Waterproofness with the insulating coating 202 is ensured.

  Furthermore, in the above-described crimped state of the coated crimping portion 131 and the insulating coating 202, the concave portion 135 of the coated crimping portion 131 is pressed against the outer peripheral surface of the insulating coating 202, and the outer periphery of the insulating coating 202 bites into the concave portion 135. The insulation coating 202 in the crimping part 131 is suppressed from being pushed out of the coating crimping part 131. As a result, the pressure between the coating crimping part 131 and the insulation coating 202 is increased, and the conductor crimping part 132 and the electric wire Waterproofness between the conductor 201 is ensured.

  As described above, according to the crimp terminal 100 and the crimp connection structure 1 of this embodiment, the insulation coating 202 in the coated crimp portion 131 is prevented from being pushed out of the coated crimp portion 131 by the crimped coated crimp portion 131. By doing so, the waterproofness between the coating | coated crimping | compression-bonding part 131 and the insulation coating 202 can be improved.

Specifically, since the recessed portion 135 that is recessed with respect to the inner peripheral surface 131 a is provided on the inner peripheral surface 131 a of the coated crimping portion 131, the friction of the inner peripheral surface 131 a of the coated crimped portion 131 can be increased. Thereby, when the coated crimping part 131 is crimped to the outer periphery of the insulating coating 202 of the coated electric wire 200, the recess 135 prevents the insulating coating 202 in the coated crimping part 131 from being pushed out of the coated crimping part 131. As a result, the pressure between the coated crimping part 131 and the insulating coating 202 can be increased, and the waterproofness between the coated crimping part 131 and the insulating coating 202 can be improved.

  Furthermore, since the pressure between the coated crimping portion 131 and the insulating coating 202 is increased, the crimp terminal 100 receives an external force, or the linear expansion difference is generated between the coated crimping portion 131 and the insulating coating 202 due to the atmospheric temperature. Even if it occurs, the adhesion between the coated crimping part 131 and the insulating coating 202 can be maintained, and this also improves the waterproofness between the coated crimping part 131 and the insulating coating 202.

  In addition, since the inner diameter of the conductor crimping portion 132 is smaller than the inner diameter of the coated crimping portion 131, the coated crimping portion 131 is easily positioned on the outer periphery of the insulating coating 202 when one end of the covered electric wire 200 is inserted into the crimping portion 130. Thus, the above-described effects of the recess 135 can be surely exhibited, and the range in which the recess 135 is provided on the inner peripheral surface of the cover crimping portion 131 can be limited to a necessary minimum.

  In addition, the crimp connection structure 1 includes the covered electric wire 200 in which the outer periphery of the electric wire conductor 201 is covered with the insulating coating 202, and the above-described crimp terminal 100 that is crimped to one end of the covered electric wire 200. Since it has, the connection structure which has the above-mentioned crimping | compression-bonding part 130 can be obtained.

  Hereinafter, modifications of this embodiment will be described.

(Modification 1)
In the above embodiment, the recesses 135 are formed in a row extending continuously along the circumferential direction Q on the inner peripheral surface 131a of the covering crimping part 131 (see FIG. 3), as shown in FIG. In addition, the recess 135 is formed in a localized shape (for example, a circular shape in plan view, a rectangular shape in plan view, or a star shape in plan view) that is locally limited in the terminal axis direction X and the circumferential direction Q on the inner peripheral surface 131a. A plurality may be arranged at intervals along the circumferential direction Q.

  In FIG. 6, concave portions 135 having different local shapes (for example, a circular concave portion in plan view, a concave portion having a rectangular shape in plan view, and a concave portion having a star shape in plan view) are arranged in combination. A plurality of concave portions (for example, rectangular concave portions in plan view) may be arranged.

  As described above, according to this modification, the insulating coating 202 of the covered electric wire 200 can be effectively digged into the recess 135, whereby the insulating coating 202 in the coated crimping portion 131 is pushed out of the coated crimping portion 131. Can be further suppressed.

(Modification 2)
In the first modification, only one row in the terminal axis direction X is provided in the inner peripheral surface 131a of the cover crimping portion 131, in which a plurality of recesses 135 are arranged in the circumferential direction Q so as to be spaced from each other. However, as shown in FIG. 7, the rows R may be provided in a plurality of rows (for example, two rows) at intervals along the terminal axis direction X.

  In FIG. 7, each recess 135 in each row R is formed in the same local shape (for example, a rhombus in plan view), but each recess 135 in each row R may have a different local shape.

  As described above, according to this modification, the range where the recess 135 is provided on the inner peripheral surface 131a of the covering crimping portion 131 spreads in a planar shape developed in the circumferential direction Q and the terminal axis direction X, and thus spreads in a planar shape. As a result, the insulating coating 202 of the coated electric wire 200 can be caused to bite into the recess 135, and the insulating coating 202 in the coated crimping portion 131 can be further suppressed from being pushed out of the coated crimping portion 131.

(Modification 3)
In the modified example 2, among the adjacent rows R, each concave portion 135 of one row R is arranged right next to each concave portion 135 of the other row R. However, as shown in FIG. Each recess 135 may be arranged in a staggered arrangement. In other words, of the adjacent rows R, each recess 135 in one row R is provided in a state of being overlapped with the interval L between the adjacent recesses 135 in the other row R when viewed from the terminal axis direction X. May be.

  In FIG. 8, each recess 135 in one row R is part of at least one of the adjacent recesses 135 (both adjacent in FIG. 8) of the adjacent recesses 135 with the interval L overlapping each other when viewed from the terminal axis direction X. Are provided in an overlapping state.

More specifically, the circumferential length Q of each recess 135 in one row R is defined as a first length T1, and the recesses 135 adjacent to each other in the interval L where each recess 135 in one row R overlaps itself. When the length in the circumferential direction Q of the overlap with one and the other is the second length T2 and the third length T3, respectively, the sum of the second length T2 and the third length T3 is the first length. It is set to be 50% or less of T1 (that is, T2 + T3 ≦ 0.5 × T1).
In addition, when there is no overlap between one and the other of the concave portions 135 on both sides of the interval L where each concave portion 135 of one row R overlaps itself, the second length T2 and the third length T3 are respectively values. 0.

  As described above, according to this modification, if the recesses 135 of the adjacent rows R are linearly arranged along the terminal axis direction X, moisture passes through the path passing through the recesses 135 arranged in a straight line. However, in this modification, the recesses 135 of the adjacent rows R are prevented from being arranged in a straight line along the terminal axis direction X. Thereby, while maintaining the waterproofness between the coating crimping part 131 and the insulating coating 202, the waterproofing fall by the shift | offset | difference of the insulating coating 202 can be suppressed.

In addition, since the sum of the second length T2 and the third length T3 is 50% or less of the first length T1, the interval L where the concave portions 135 of one row R overlap each other is defined as the covering crimping portion 131 and the insulating coating. The interval can be set to a degree that can ensure waterproofness with the 202.
Note that if the sum of the second length T2 and the third length T3 exceeds 50% of the first length T1, the above-described effect cannot be obtained. That is, the interval L becomes too narrow and the above-described partial overlap becomes too large. This makes it easy to form a path through which moisture passes along the terminal axis direction X, and the coating pressure-bonding portion 131 and the insulating coating 202 The waterproofness between the two decreases.

(Modification 4)
In the above embodiment, the total occupied area S1 of each recess 135 provided on the inner peripheral surface 131a of the cover crimping portion 131 is less than 50% of the area S2 of the inner peripheral surface 131a as shown in FIG. It may be set as follows. In FIG. 9, the recesses 135 are formed in the same local shape (for example, a flat hexagonal shape in plan view) and arranged in a staggered arrangement, but are not limited to such a shape and arrangement.

  As described above, according to this modification, a sufficient contact area between the outer peripheral surface of the insulating coating 202 of the coated electric wire 200 and the inner peripheral surface of the coated crimping portion 131 can be ensured. Waterproofness between the cover 202 and the coating 202 can be improved. Further, distortion of the coated crimping part 131 can also be suppressed.

  In addition, the interval between the recesses 135 provided on the inner peripheral surface 131 a of the covering crimp portion 131 is formed wider than the interval between the recesses 136 provided on the inner peripheral surface 132 a of the conductor crimp portion 132. The recesses 136 of the conductor crimping part 132 are arranged at a narrow interval so as to increase the total circumferential length of the recesses 136 as edges in order to break the oxide film of the aluminum wire and ensure electrical connection. On the other hand, it is preferable to arrange each recessed part 135 of the coating | compression-bonding crimping part 131 at predetermined intervals so that the compressive stress in the recessed part 135 may fall and waterproofness may not fall.

  In addition, the length in the terminal axial direction X of each recess 135 provided on the inner peripheral surface 131a of the coated crimping portion 131 is the length in the terminal axial direction X of each recess 136 provided in the inner peripheral surface 132a of the conductor crimping portion 132. It is formed longer than the length. Each concave portion 136 of the conductor crimping portion 132 is formed to have a short length in the terminal axial direction of the concave portion 136 so that a shearing force is exerted on the electric wire in order to break the oxide film of the aluminum element wire and ensure electrical connection. On the other hand, it is preferable to form each recess 135 of the coating pressure-bonding portion 131 longer than a predetermined length in the terminal axis direction so that the insulating coating 202 is bitten into the recess 135 without shearing.

(Modification 5)
In the above embodiment, as shown in FIG. 10, a concave portion 135 may be provided in a predetermined section W in the circumferential direction Q on the inner peripheral surface 131 a of the covering crimping portion 131. The section W is a region of the inner peripheral surface 131a that partially extends along the circumferential direction Q and extends from one end to the other end of the inner peripheral surface 131a along the terminal axis direction X. The recess 135 extends from one end to the other end of the section W along the circumferential direction Q, and a plurality of recesses 135 (three in FIG. 10) are provided at intervals in the terminal axis direction X.

As shown in FIG. 11, the section W corresponds to a joint (that is, the joint between the first crimping die 11 and the second crimping die 12) M when the crimping die 10 is crimped (that is, the joint between the first crimping die 11 and the second crimping die 12). For example, it is provided at a location overlapping the joint M).
More specifically, when the first crimping die 11 and the second crimping die 12 are crimped in the vertical direction (that is, in the opposite direction), in the vicinity of the joint M between the first crimping die 11 and the second crimping die 12, Pressure in the radial direction of the crimping portion 130 by the crimping die 10 is weakened. As described above, in the portion where the pressure applied to the crimping portion 130 by the crimping die 10 is weak (that is, the joint M), the frictional resistance between the crimping portion 130 and the insulating coating 202 is reduced, and the insulating coating 202 is covered. There is a case where the waterproofness between the coated crimping portion 131 and the insulating coating 202 is lowered due to the extrusion from the crimping portion 131. For this reason, the section W provided with the recess 135 is provided at a location corresponding to the joint M of the crimping die 10 on the inner peripheral surface 131a of the covering crimping portion 131 as described above. The recess 135 extends from one end to the other end of the section W along the circumferential direction Q, so that the recess 135 is surely overlapped with the joint M.

  As described above, when the crimping die 10 is crimped, the portion corresponding to the joint M on the outer peripheral surface 131b of the cover crimping portion 131 is the other portion (that is, the portion not corresponding to the joint M). A relatively weak pressure is applied from the crimping die 10. For this reason, the part corresponding to the joint M in the outer peripheral surface 131b of the covering crimping part 131 has a shape protruding outward from the other parts. That is, a convex portion 131 c that protrudes outward is formed along the terminal axis direction X at a portion corresponding to the joint M of the outer peripheral surface 131 b of the covering crimping portion 131. Therefore, in other words, the section W is provided at a position corresponding to the convex portion 131 c of the outer peripheral surface 131 b of the covering crimping portion 131 on the inner peripheral surface 131 a of the covering crimping portion 131. That is, the recessed part 135 is provided in the location corresponding to the convex part 131c among the internal peripheral surfaces 131a of the covering crimping part 131.

  Further, the coating crimping part 131 is compressed on the outer periphery of the insulating coating 202 by compressing the insulating coating 202 in the thickness direction. Of the coating crimping part 131, the convex part 131c (that is, when crimping by the crimping die 10). In the portion corresponding to the eye M), the compression ratio for compressing the insulating coating 202 in the thickness direction is relatively lower than that of the other portions because the protrusion 131c protrudes outward. That is, the amount by which the insulating coating 202 is crushed is relatively small, and the repulsive force of the crushed insulating coating 202 on the inner surface side of the coating crimping portion 131 is also reduced. Therefore, in other words, in the section W, the insulating coating 202 is compressed by compressing the insulating coating 202 at a relatively low compressibility in the thickness direction as compared with other regions on the inner peripheral surface 131a of the coating crimping portion 131. It is provided in the area | region crimped | bonded to the outer periphery. That is, the recess 135 is provided in such a region.

  As described above, according to this modification, since the recess 135 is provided in the predetermined section W in the circumferential direction Q on the inner peripheral surface 131a of the covering crimping part 131, the insulating coating 202 and the covering crimping part in the predetermined section W are provided. It is possible to increase the frictional resistance with respect to 131, thereby suppressing the insulation coating 202 from being pushed out of the coating crimping portion 131, and improving the waterproofness between the coating crimping portion 131 and the insulating coating 202. it can.

  Further, since the section W is provided at a location corresponding to the joint M of the crimping die 10 on the inner peripheral surface 131a of the covering crimping portion 131, the section W is formed on the joint M on the inner peripheral surface 131a when the crimping die 10 is crimped. The recessed part 135 can be arrange | positioned in the corresponding location (namely location where waterproofness falls easily), and, thereby, the waterproofness between the coating | coated crimping | compression-bonding part 131 and the insulation coating 202 can be improved effectively.

  The section W is a region of the inner peripheral surface 131a of the coating crimping part 131 that is compressed onto the outer periphery of the insulating coating 202 by compressing the insulating coating 202 at a relatively low compression ratio compared to other regions (that is, the inner surface 131a). Since the recessed portion 135 can be provided in an area where the waterproof property is likely to be lowered, the waterproof property between the coated crimping part 131 and the insulating coating 202 can be effectively increased. Can be increased.

  In addition, a convex portion 131c is formed on the outer peripheral surface of the coated crimping portion 131 along the terminal axis direction X, and at least a portion corresponding to the convex portion 131c (that is, a prevention property) on the inner circumferential surface of the coated crimping portion 131. Since the concave portion 135 is provided in a portion that is liable to be lowered, it is possible to effectively improve the waterproofness between the coated crimp portion 131 and the insulating coating 202.

  In this modification, the recess 135 is provided only in the predetermined section W, but the recess 135 may be provided in a section other than the predetermined section W as shown in FIG. In this case, the recess 135X provided in the section W is formed to have a longer length in the circumferential direction Q than the recess 135Y provided in a section other than the section W. That is, the length in the circumferential direction Q in the section W is formed longer than the length in the circumferential direction Q in the recess 135Y provided outside the section W. Thereby, the recess 135X is formed so as to surely overlap the joint M.

(Modification 6)
As shown in FIG. 13, in the above embodiment, the thickness d1 of the section 202s crimped by the coating crimping part 131 in the insulating coating 202 may be formed larger than the depth d2 of the recess 135. The thickness d1 of the section 202s of the insulating coating 202 is smaller than the thickness d3 of the section 202t that is not crimped by the coating crimp portion 131 in the insulating coating 202.

  The thickness d1 is the thickness at the smallest interval among the intervals between the outer peripheral surface of the section 202s of the insulating coating 202 and the conductor wire 201, and the thickness d2 is the outer peripheral surface of the section 202t of the insulating coating 202. And the thickness of the conductor wire 201 at the minimum interval.

  As described above, according to this modification, since the thickness d1 of the section 202s of the insulating coating 202 is larger than the depth d2 of the recess 135, when the coated electric wire 200 is pulled from the crimp terminal 100, It can suppress that the part which bite into the recessed part 135 is shredded.

  In addition, since the portion of the insulating coating 202 that bites into the concave portion 135 is sufficiently strongly pressed against the entire inner surface (inner peripheral surface and bottom surface) of the concave portion 135, the degree of adhesion between the concave portion 135 and the insulating coating 202 increases, The waterproofness between the coating crimping part 131 and the insulating coating 202 can be improved.

  The present invention is not limited only to the configuration of the above-described embodiment and modification examples, and includes a combination of the above-described embodiment and modification examples, and many embodiments can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Crimp connection structure 100 ... Crimp terminal 130 ... Crimp part 131 ... Cover crimp part 132 ... Conductor crimp part 135 ... Concave part 200 ... Covered electric wire 201 ... Electric wire conductor 202 ... Insulation coating d1 ... Clamping by insulation crimp part in insulation coating Thickness of the section d2 ... Depth of recess X ... Axial direction Q ... Circumferential direction R ... Row S1 ... Area occupied by recess S2 ... Area of inner peripheral surface of coated crimping part L1 ... First length L2 ... Second Length L3 ... Third length W ... Section

Claims (11)

A crimping terminal having a crimping part that is crimped to one end of a covered electric wire whose outer periphery is covered with an insulating coating,
The crimping part is
A coated crimping part that is formed in a cylindrical shape and is crimped to the outer periphery of the insulating coating in a state where one end of the insulating coating is inserted therein;
A conductor that is formed in a cylindrical shape having an inner diameter smaller than the inner diameter of the covering crimping portion, and is crimped to the outer periphery of the electric wire conductor in a state where the electric wire conductor exposed from the one end of the insulating coating is inserted therein With a crimping part,
A crimp terminal provided on the inner peripheral surface of the coated crimp portion with a recess recessed with respect to the inner peripheral surface. 2. The crimp terminal according to claim 1, wherein a plurality of the recesses are arranged at intervals in the circumferential direction on the inner peripheral surface of the coated crimp part. In the inner peripheral surface of the coated crimping portion, a plurality of rows in which the recesses are arranged in the circumferential direction so as to be spaced apart from each other are provided in a plurality of rows at intervals in the axial direction of the crimping terminal. The crimp terminal according to claim 1 or claim 2. 4. Each of the recesses in one of the plurality of columns is provided in a state of being overlapped with an interval between the adjacent recesses in the other column when viewed from the axial direction. Crimp terminal described in 1. Each of the recesses of the one row is provided in a state where it partially overlaps at least one of the recesses on both sides of the interval when viewed from the axial direction,
The circumferential length of each of the recesses in the one row is a first length,
The length of overlap between each of the recesses of the one row and the one and the other of the recesses on both sides of the interval is a second length and a third length, respectively.
The crimp terminal according to claim 4, wherein the sum of the second length and the third length is 50% or less of the first length. The sum total of the occupied area of each said recessed part provided in the said internal peripheral surface of the said coating crimping | compression-bonding part is less than 50% of the area of the said internal peripheral surface. Crimp terminal. The inner circumferential surface of the covering crimping portion is provided with the recess in at least a predetermined section in the circumferential direction,
The predetermined section provided with the recess is compressed on the outer periphery of the insulating coating by compressing the insulating coating at a relatively low compression ratio compared to other regions of the inner peripheral surface of the covering crimping portion. The crimp terminal according to one of claims 1 to 6, provided in a region to be crimped. The crimp terminal according to claim 7, wherein the concave portion provided in the predetermined section is formed to have a longer length in the circumferential direction than the concave section provided in a section other than the predetermined section. A covered electric wire whose outer periphery is covered with an insulating coating;
A crimp connection structure according to any one of claims 1 to 8, comprising a crimp terminal crimped to one end of the covered electric wire. The crimp connection structure according to claim 9, wherein a thickness of a portion crimped by the coating crimping portion in the insulating coating is larger than a depth of the recess. A convex portion is formed along the axial direction of the crimp terminal on the outer peripheral surface of the coated crimp portion,
The crimp connection structure according to claim 9 or 10, wherein the concave portion is provided at least at a location corresponding to the convex portion in the inner peripheral surface of the covering crimp portion.

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