Terminal metal fitting

Abstract

To provide a terminal metal fitting that can surely incise a coating of a coated electric wire with an insulation displacement blade and can be surely connected to a core wire of the coated electric wire.SOLUTION: A terminal metal fitting 10 comprises: a terminal connection part 10A that is connected to a mate-side terminal P; and an electric wire connection part 10B leading to a rear end of the terminal connection part 10A, and extended backward to be connected to an electric wire 30. The electric wire connection part 10B has: a bottom wall 10E extending in a longitudinal direction; a pair of side walls 10F protruding in one direction of a plate thickness direction of the bottom wall 10E from each of a pair of side edges extending in the longitudinal direction in the bottom wall 10E; and a pair of insulation displacement blades 10G that expand inwardly from the side walls 10F. The insulation displacement blades 10G each have an insulation displacement blade main body part 10J provided at a protruding end side of the side wall 10F and incising a coating 32 of the electric wire 30, and a connection part 10K provided at the bottom wall 10E side and connected to a core wire 31 of the electric wire 30. A dimension in a longitudinal direction of each insulation displacement blade main body part 10J is smaller than a dimension in the longitudinal direction of each connection part 10K.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a terminal fitting. [Background technology]

[0002] Patent Document 1 discloses a pressure-displacement terminal that cuts open the insulation displacement coating of an electric wire using opposing pressure-displacement blades. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-313448 Summary of the Invention [Problem to be solved by the invention]

[0004] It is preferable that the terminal fitting is connected to the core wire of the electric wire via plating. Therefore, the portion of the terminal fitting that is connected to the core wire of the electric wire needs to be plated. For example, as in Patent Document 1, by forming the insulation displacement blade so that it protrudes from the side wall, the plated surface can be used as the surface that connects to the core wire. However, because the protruding end of the insulation displacement blade in the form as in Patent Document 1 is formed to be rounded, there is a concern that it may not be able to completely cut through the insulation of the electric wire.

[0005] The terminal fitting of the present disclosure has been completed based on the above circumstances, and aims to provide a terminal fitting that can reliably cut open the insulation of an insulated electric wire with a pressure-connecting blade and reliably connect to the core wire of the insulated electric wire. [Means for solving the problem]

[0006] The terminal fitting of the present disclosure comprises: a terminal connection portion to be connected to a mating terminal; an electric wire connection portion connected to a rear end of the terminal connection portion and extending rearward to be connected to an insulated electric wire; Equipped with The electric wire connection portion is a bottom wall extending in the front-rear direction; a pair of side walls projecting in one direction in a thickness direction of the bottom wall from each of a pair of side edges extending in a front-rear direction of the bottom wall; a pair of pressure blades extending inward from each of the side walls; and each of the insulation displacement blades has an insulation displacement blade body portion provided on the protruding end side of the side wall and configured to cut through the insulation of the insulated electric wire, and a connecting portion provided on the bottom wall side and configured to be connected to a core wire of the insulated electric wire, The dimension of each of the press blade main bodies in the front-rear direction is smaller than the dimension of each of the connecting portions in the front-rear direction. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a terminal fitting that can reliably cut open the covering of a covered electric wire with a pressure-connecting blade and reliably connect to the core wire of the covered electric wire. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a terminal fitting of the present embodiment. [Figure 2] FIG. 2 is a plan view showing a terminal fitting to which an electric wire is connected. [Figure 3] FIG. 3 is an enlarged perspective view of the main part showing the electric wire connection portion and its surroundings. [Figure 4] FIG. 4 is an enlarged plan view of the main part showing the electric wire connection portion and its surroundings. [Figure 5] FIG. 5 corresponds to a cross-sectional view taken along line AA in FIG. 2, and shows a state in which the electric wire is disposed above the electric wire connecting portion. [Figure 6] FIG. 6 corresponds to a cross-sectional view taken along the line AA in FIG. 2, and shows a state in which the electric wire is inserted between the bent portions of the pair of press-connecting blade main bodies. [Figure 7] FIG. 7 is a cross-sectional view taken along the line AA in FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along the line BB in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. (1) a terminal connection portion to be connected to a mating terminal; an electric wire connection portion connected to a rear end of the terminal connection portion and extending rearward to be connected to an insulated electric wire; Equipped with The electric wire connection portion is a bottom wall extending in the front-rear direction; a pair of side walls projecting in one direction in a thickness direction of the bottom wall from each of a pair of side edges extending in a front-rear direction of the bottom wall; a pair of pressure blades extending inward from each of the side walls; and each of the insulation displacement blades has an insulation displacement blade body portion provided on the protruding end side of the side wall and configured to cut through the insulation of the insulated electric wire, and a connecting portion provided on the bottom wall side and configured to be connected to a core wire of the insulated electric wire, The terminal fitting, wherein the dimension of each of the press-connecting blade main bodies in the front-rear direction is smaller than the dimension of each of the connecting portions in the front-rear direction.

[0010] In the terminal fitting (1), the longitudinal dimension of the insulation displacement blade body is smaller than the longitudinal dimension of each connecting portion. Therefore, when an insulated electric wire is moved between the pair of insulation displacement blade body portions from the protruding end of the side wall toward the bottom wall, pressure from the insulation displacement blade body portions is easily concentrated on the insulation of the insulated electric wire, making it easy to cut through the insulation. Furthermore, the longitudinal dimension of the connecting portion is larger than that of the insulation displacement blade body portions, which is expected to increase the contact area between the connecting portion and the core wire. Therefore, the insulation displacement blades of this terminal fitting can reliably cut through the insulation of the insulated electric wire with the insulation displacement blade body portions and reliably connect to the core wire of the insulated electric wire with the connecting portion.

[0011] (2) The terminal fitting according to (1), wherein the edge of each of the press-connecting blade main bodies on the protruding end side of the side wall is inclined so as to approach the bottom wall as it moves away from the side wall.

[0012] The terminal fitting (2) can guide the insulated electric wire into the pressure-connecting blade, facilitating the insertion of the insulated electric wire into the pressure-connecting blade.

[0013] (3) The terminal fitting according to (1) or (2), wherein the thickness direction of each of the pressure-contact blade main body portions is oriented in the front-to-rear direction, and the thickness of the protruding edge portion away from the side wall decreases with increasing distance from the side wall.

[0014] The terminal fitting (3) allows the pressure from the insulation displacement blade body to be more easily concentrated on the insulation of the insulated electric wire, so that the insulation can be cut open more easily.

[0015] (4) The terminal fitting according to any one of (1) to (3), wherein the distance between the pair of press-connecting blade main body portions is larger than the distance between the pair of connecting portions.

[0016] The terminal fitting (4) makes it possible to prevent the core wire of the insulated electric wire from being damaged by the pressure contact blade body when connecting the insulated electric wire, and also to ensure reliable contact between the connecting portion and the core wire.

[0017] (5) The terminal fitting according to any one of (1) to (4), wherein the distance between the pair of press-connecting blade main bodies is smaller than the outer diameter of the core wire.

[0018] The terminal fitting (5) can reliably cut open the insulation of the insulated electric wire with the insulation displacement blade body, thereby reliably exposing the core wire at the cut-open portion of the insulation.

[0019] [Details of the embodiments of the present disclosure] <Embodiment 1> The terminal fitting 10 of the first embodiment will be described with reference to Figures 1 to 8. In the figures, "front side," "rear side," "upper side," "lower side," "right side," and "left side" are represented by "F," "B," "U," "D," "R," and "L," respectively. In the following description, the direction in which the mating terminal P and the terminal fitting 10 are mated is defined as the mating direction (front-rear direction).

[0020] The terminal fitting 10 of this embodiment is connected to the end of an electric wire 30 (see FIG. 2). As shown in FIG. 1, the electric wire 30 is a so-called coated electric wire, and has a conductive core wire 31 and an insulating coating 32 that covers the outer periphery of the core wire 31. The core wire 31 is a single-core wire made of aluminum, for example. The coating 32 is made of synthetic resin. At the front end of the electric wire 30, the coating 32 is not removed, and only the tip end surface of the core wire 31 is exposed.

[0021] [Terminal metal fitting configuration] The terminal fitting 10 is formed by bending a conductive metal plate or the like. The terminal fitting 10 of this embodiment is a so-called female terminal fitting. As shown in Fig. 1, the terminal fitting 10 includes a rectangular cylindrical terminal connection portion 10A and an electric wire connection portion 10B that is continuous with the rear end of the terminal connection portion 10A and extends rearward. A tab-shaped mating terminal P is inserted into the terminal connection portion 10A and is electrically connected to the mating terminal P (see Fig. 2).

[0022] The wire connection portion 10B has a flat bottom wall 10E elongated in the front-rear direction, a pair of left and right side walls 10F, a pair of left and right insulation blades 10G, and a pair of left and right insulation barrel pieces 10H. The bottom wall 10E is flush with the rear end of the bottom wall of the terminal connection portion 10A. The pair of left and right side walls 10F protrude upward (in one direction in the thickness direction of the bottom wall 10E) from the left and right edges (pair of side edges) of the bottom wall 10E extending in the front-rear direction. The front ends of each side wall 10F are continuous with the rear ends of the left and right side walls of the terminal connection portion 10A, respectively. The thickness direction of each side wall 10F is oriented in the left-right direction. The pair of left and right side walls 10F face each other and are spaced apart in the left-right direction.

[0023] As shown in Fig. 3, two pairs of left and right press-connecting blades 10G are provided spaced apart in the front-rear direction. Each press-connecting blade 10G protrudes inward in the left-right direction from each side wall 10F. Each press-connecting blade 10G has a press-connecting blade main body 10J located on the upper side (the protruding end side of the side wall 10F) and configured to cut open the insulation 32 of the electric wire 30, and a connecting portion 10K located on the lower side (the bottom wall 10E side) and configured to connect to the core wire 31 of the electric wire 30. Each press-connecting blade main body 10J has a base 10Q that protrudes upward from the side wall 10F and extends cantilevered rearward, and a bent portion 10R that is connected to the rear end of the base 10Q and bent inward in the left-right direction.

[0024] Each bent portion 10R is a single plate with its thickness oriented in the front-to-rear direction. The upper edge 10L of each bent portion 10R is inclined downward inward in the left-to-right direction. In other words, the upper edge 10L of each bent portion 10R of each press-connecting blade main body 10J at the protruding end of each side wall 10F is inclined so as to approach the bottom wall 10E as it moves inward in the left-to-right direction from each side wall 10F. The inner left-to-right edge 10M of each bent portion 10R is formed to extend downward, continuing from the lower end of the upper edge 10L. The protruding edge of the bent portion 10R away from the side wall 10F is formed so that its thickness (dimension in the front-to-rear direction) decreases as it moves inward in the left-to-right direction from the side wall 10F. Specifically, an inclined surface T is formed on the front side of the protruding edge of each bent portion 10R, inclining rearward toward the center in the left-to-right direction. The bent portions 10R of the pair of left and right press-connecting blades 10G are spaced apart in the left-right direction.

[0025] Each connecting portion 10K is disposed below the insulation displacement blade main body 10J. Each connecting portion 10K is spaced apart in the up-down direction from the bent portion 10R of the insulation displacement blade main body 10J. The front and rear ends of each connecting portion 10K are connected to the side wall 10F. The front-rear center portion of each connecting portion 10K is formed to protrude inward in the left-right direction beyond the front and rear ends. Each connecting portion 10K is formed in a double-supported shape. When viewed from above, the front-rear center portion of each connecting portion 10K is formed to protrude inward in the left-right direction in a V-shape (see FIG. 4). In other words, the front-rear center portion of each connecting portion 10K is bent inward in the left-right direction. When viewed from above, the front-rear dimension L1 (plate thickness dimension) of the bent portion 10R of the insulation displacement blade main body 10J is smaller than the front-rear dimension L2 of the connecting portion 10K (see FIG. 4). When viewed from above, an imaginary extension line F1 extending from the rear surface of the bending portion 10R toward the center in the left-right direction and an imaginary extension line F2 extending from the inclined surface T toward the center in the left-right direction intersect so as to overlap the position at which the connecting portion 10K protrudes most inward in the left-right direction (see FIG. 4). The left-right separation dimension S1 between the pair of left and right bending portions 10R is larger than the left-right separation dimension S2 between the pair of left and right connecting portions 10K at the center in the front-rear direction (see FIG. 4).

[0026] As shown in Fig. 1, a pair of left and right insulation barrel pieces 10H are formed by rising one by one from the rear end of each side wall 10F. Each insulation barrel piece 10H is wound around and crimped onto the insulation 32 of the electric wire 30 (see Fig. 2). The pair of left and right insulation barrel pieces 10H are crimped onto the insulation 32 and mechanically connected thereto.

[0027] [An example of the process for attaching wires to terminal fittings] The end portion of the electric wire 30 is brought close to the electric wire connection portion 10B from above (see FIG. 5). At this time, the direction in which the electric wire 30 extends is aligned in the front-rear direction, and then the electric wire 30 is brought close to the electric wire connection portion 10B.

[0028] The wire 30 is guided to the left-right center by the upper edges 10L of each bent portion 10R and enters between the pair of left and right bent portions 10R (see FIG. 6). Then, both left and right ends of the coating 32 of the wire 30 are cut by the pair of left and right bent portions 10R. The cut surfaces formed in the coating 32 by the bent portions 10R face the front-rear direction (not shown). The distance S1 between the left and right inner edges 10M of the bent portions 10R of the pair of left and right press-connecting blade main bodies 10J is smaller than the outer diameter E of the core 31 of the wire 30 (the inner diameter of the coating 32). Therefore, both left and right ends of the coating 32 of the wire 30 are reliably cut open so that the outer circumferential surface of the core 31 is exposed.

[0029] When the electric wire 30 comes into contact with the upper surface of the bottom wall 10E (see FIG. 7), it enters the space between the pair of left and right connecting portions 10K. At this time, each bending portion 10R does not come into contact with the electric wire 30. In other words, each press-connecting blade main body 10J comes into contact with the electric wire 30 only when cutting open the coating 32 of the electric wire 30. At this time, when viewed from above, each connecting portion 10K comes into contact with the core wire 31 of the electric wire 30 with a width in the front-rear direction (see FIG. 8). The dimension L3 in the front-rear direction at the portion where each connecting portion 10K comes into contact with the core wire 31 is larger than the plate thickness of the bending portion 10R.

[0030] Next, the effects of this configuration will be illustrated. The terminal fitting 10 includes a terminal connection portion 10A for connection to a mating terminal P, and an electric wire connection portion 10B that is continuous with the rear end of the terminal connection portion 10A and extends rearward to be connected to an electric wire 30. The electric wire connection portion 10B includes a bottom wall 10E extending in the front-rear direction, a pair of left and right side walls 10F that protrude in one direction in the thickness direction of the bottom wall 10E from each of a pair of side edges extending in the front-rear direction of the bottom wall 10E, and a pair of left and right pressure contact blades 10G that protrude inward in the left-right direction from each side wall 10F. Each pressure contact blade 10G includes a pressure contact blade main body 10J that is provided on the protruding end side of the side wall 10F and cuts through the coating 32 of the electric wire 30, and a connection portion 10K that is provided on the bottom wall 10E side and is connected to the core wire 31 of the electric wire 30. The dimension L1 in the front-rear direction of the bent portion 10R of each press-connecting blade body portion 10J is smaller than the dimension L2 in the front-rear direction of each connecting portion 10K.

[0031] According to this configuration, the dimension L1 in the front-rear direction of the bent portion 10R of the insulation displacement blade body 10J is smaller than the dimension L2 in the front-rear direction of each connecting portion 10K. Therefore, when the electric wire 30 is moved between the pair of left and right insulation displacement blade bodies 10J from the protruding end of the side wall 10F toward the bottom wall 10E, pressure from the insulation displacement blade body 10J is easily concentrated on the insulation 32 of the electric wire 30, and the insulation 32 can be easily cut open. Furthermore, since the dimension L2 in the front-rear direction of the connecting portion 10K is larger than the dimension L1 in the front-rear direction of the bent portion 10R of the insulation displacement blade body 10J, it is expected that the contact area between the connecting portion 10K and the core wire 31 can be increased. Therefore, the insulation displacement blades 10G of the terminal fitting 10 can reliably cut open the insulation 32 of the electric wire 30 with the insulation displacement blade body 10J and reliably connect to the core wire 31 of the electric wire 30 with the connecting portion 10K.

[0032] The upper edge 10L of the bent portion 10R of each insulation displacement blade body 10J on the protruding end side of the side wall 10F is inclined downward so as to approach the bottom wall 10E as it moves away from the side wall 10F. This configuration makes it possible to guide the electric wire 30 into the insulation displacement blade 10G, facilitating the insertion of the electric wire 30 into the insulation displacement blade 10G.

[0033] The thickness of the bent portion 10R of each blade body 10J is oriented in the front-to-rear direction, and the thickness of the protruding edge of the bent portion 10R away from the side wall 10F decreases with increasing distance from the side wall 10F. This configuration makes it easier to concentrate pressure from the bent portion 10R of the blade body 10J on the insulation 32 of the electric wire 30, making it easier to cut open the insulation 32.

[0034] The distance S1 between the bent portions 10R of the pair of press-connecting blade bodies 10J in the left-right direction is larger than the distance S2 between the pair of connecting portions 10K in the left-right direction. With this configuration, when connecting the electric wires 30, the bent portions 10R of the press-connecting blade bodies 10J are less likely to damage the core wires 31 of the electric wires 30, and the connecting portions 10K and the core wires 31 can be reliably brought into contact with each other.

[0035] The distance S1 in the left-right direction between the bent portions 10R of the pair of press-connecting blade main bodies 10J is smaller than the outer diameter E of the core wire 31. With this configuration, the bent portions 10R of the press-connecting blade main bodies 10J can cut open the coating 32 of the electric wire 30, thereby reliably exposing the core wire 31 at the cut-open portion of the coating 32.

[0036] <Other embodiments> The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is not limited to the embodiments disclosed herein, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0037] Unlike the first embodiment, the bent portions of the press blade main body may be formed so as to be inclined forward or backward as they extend inward in the left-right direction.

[0038] The number of pairs of press-connecting blades may be one or three or more.

[0039] Unlike the first embodiment, the terminal connection portion may be formed in a tab shape, that is, a male terminal fitting.

[0040] Unlike the first embodiment, the upper edge of the bent portion may be curved downward or upward and inclined so as to approach the bottom wall as it moves away from each side wall.

[0041] Unlike the first embodiment, an inclined surface may be provided on the rear side of the protruding edge of the bent portion, or inclined surfaces may be provided on both the front side and the rear side.

[0042] Unlike the first embodiment, the distance between the pair of bent portions may be the same as the distance between the pair of connecting portions, or the distance between the pair of bent portions may be smaller than the distance between the pair of connecting portions.

[0043] Unlike the first embodiment, the distance between the pair of bent portions may be the same as the outer diameter of the core wire. [Explanation of symbols]

[0044] 10: Terminal fitting 10A: Terminal connection 10B: Wire connection part 10E: Bottom wall 10F: Side wall 10G: Pressure blade 10H: Insulation barrel piece 10J: Pressure blade body 10K: Connection 10L: Upper edge 10M: Left and right inner edges 10Q: Base 10R: Bent part 30: Electric wire (coated wire) 31: Core wire 32: Covering E: Outer diameter of the core wire F1,F2: Overhead extension line L1: Dimension of the bent part in the front-to-rear direction L2: Front-to-rear dimension of the connection L3: The dimension in the front-to-rear direction at the part where the connection part contacts the core wire P: Mating terminal S1: Distance between the pressure blade body S2: Spacing dimension of connection part T: Inclined surface

Claims

1. a terminal connection portion to be connected to a mating terminal; an electric wire connection portion connected to a rear end of the terminal connection portion and extending rearward to be connected to an insulated electric wire; Equipped with The electric wire connection portion is a bottom wall extending in the front-rear direction; a pair of side walls projecting in one direction in a thickness direction of the bottom wall from each of a pair of side edges extending in a front-rear direction of the bottom wall; a pair of pressure blades extending inward from each of the side walls; and each of the insulation displacement blades has an insulation displacement blade body portion provided on the protruding end side of the side wall and configured to cut through the insulation of the insulated electric wire, and a connecting portion provided on the bottom wall side and configured to be connected to a core wire of the insulated electric wire, The terminal fitting, wherein the dimension of each of the press-connecting blade main bodies in the front-rear direction is smaller than the dimension of each of the connecting portions in the front-rear direction.

2. 2. The terminal fitting according to claim 1, wherein the edge of each of the press-connecting blade main bodies on the projecting end side of each of the side walls is inclined so as to approach the bottom wall as it moves away from each of the side walls.

3. 3. The terminal fitting according to claim 1, wherein the thickness direction of each of the pressure contact blade main bodies is in the front-rear direction, and the thickness of the protruding edge portions remote from the side walls decreases with increasing distance from the side walls.

4. 3. The terminal fitting according to claim 1, wherein a distance between the pair of press-connecting blade main bodies is greater than a distance between the pair of connecting portions.

5. 3. The terminal fitting according to claim 1, wherein a distance between the pair of press-connecting blade main bodies is smaller than an outer diameter of the core wire.

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