JP2011138668A - Terminal fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal fitting in which it is possible to enlarge a contact surface with a core wire of an electric wire, stable contact reliability with the core wire is obtained, and downsizing becomes possible. <P>SOLUTION: The terminal fittings 1 includes a bottom plate part 31, on which the core wire of the electric wire is placed; a pair of side plate parts 32, extendedly installed from both side parts of the bottom plate part 31; and a tip biting-in part 33, which is installed at the tip of the pair of side plate parts 32 and which bites into the core wire in a crimped state, is caulked and connected to the electric wire terminal. At the end part in the longitudinal direction of the electric wire of the tip biting-in part 33, a thickened part 34 is installed which protrudes from the side plate part 32. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a terminal fitting that is crimped and connected to a terminal of a covered electric wire.

  Patent Literature 1 and Patent Literature 2 describe conventional terminal fittings. The terminal fitting described in Patent Document 1 has a structure in which irregularities are formed at both ends in the width direction of the core wire crimping portion, and when the core wire crimping portion is crimped to the core wire, the irregularities are difficult to interleave, which is favorable. Conductivity can be obtained.

  The terminal fitting described in Patent Document 2 has a structure in which a protrusion is cut and raised in the surface of the terminal fitting or a saw blade-like protrusion is formed on the end face of the terminal fitting. In this terminal fitting, when the terminal fitting is rounded and crimped to the covered electric wire, the cut-and-raised projection and the saw blade projection penetrate through the insulating coating and penetrate into the core wire, so that electrical connection with the core wire is possible. Therefore, it is not necessary to remove the insulating coating.

  FIG. 6 shows a conventional terminal fitting 100 having a core wire crimping portion that is crimped to a core wire of an electric wire, as described in Patent Documents 1 and 2. The terminal fitting 100 includes a wire holding portion 120 that is held by the insulation coating by being crimped to the insulation coating of the wire, a core wire crimping portion 130 that is crimped to the core wire by being crimped to the core wire 5b of the wire, The mating terminal has a mating terminal contact portion 140 that is electrically connected to the mating terminal by inserting the mating terminal, and these are integrally formed along the longitudinal direction of the electric wire.

  In the core wire crimping portion 130, a straight compression portion 133 and bell mouths 135 on both sides of the compression portion 133 are formed by crimping with a crimping die (see FIG. 4). The compression part 133 is crimped | bonded to the core wire of an electric wire, has length M2, and contacts a core wire. The bell mouth 135 is formed by pulling the core wire crimping portion 130 upward when the core wire crimping portion 130 is crimped. The bell mouth 135 is formed at both ends in the longitudinal direction of the compression portion 133 in a state having a length M2. By forming the bell mouth 135, the core wire is prevented from being cut.

JP-A-6-104020 JP 2001-185251 A

  The compressing unit 133 is in contact with the core wire by compressing the core wire of the electric wire, but the bell mouth 135 is separated from the core wire by being tilted upward, so that the core wire does not come into contact with the core wire. As the length M1 of the bell mouth 135 increases, the length M2 of the compression unit 133 decreases. When the length M2 of the compression part 133 is shortened, there is a problem that a large contact area with the core wire of the compression part 133 cannot be secured, and stable contact reliability cannot be obtained with respect to the core wire. Moreover, in the conventional terminal metal fitting 100, in order to lengthen the compression part 133, it is necessary to lengthen the core wire crimping part 130. Therefore, the terminal metal fitting 100 cannot be reduced in size.

  Accordingly, an object of the present invention is to provide a terminal fitting that can increase the contact area with the core wire of the electric wire, obtain not only stable contact reliability with the core wire, but also miniaturization. And

  The invention according to claim 1 is provided at the bottom plate portion on which the core wire of the electric wire terminal is placed, the pair of side plate portions extended from both side portions of the bottom plate portion, and the tips of these pair of side plate portions, A terminal fitting that has a tip biting portion that is difficult to crimp the core wire in a crimped state, and is crimped and connected to an electric wire end, and a fleshing portion that protrudes from the side plate portion at the end in the electric wire longitudinal direction of the tip biting portion Is provided.

  A second aspect of the present invention is the terminal fitting according to the first aspect, wherein the fleshing portions are provided at both ends in the longitudinal direction of the electric wire.

  According to the first aspect of the present invention, the end biting portion is given strength by providing the fleshing portion at the end portion of the tip biting portion of the side plate portion into which the core of the electric wire is difficult to be inserted. For this reason, the amount of biting of the tip biting portion into the core wire when crimped to the wire end can be secured, the contact area with the core wire can be increased, and stable contact reliability with the core wire can be obtained. it can. Further, since stable contact reliability can be obtained, the side plate portion can be shortened accordingly, and the terminal fitting can be reduced in size.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the fleshing portions are provided at both ends in the longitudinal direction of the electric wire, the both ends in the longitudinal direction of the tip biting portion are provided. Strength can be imparted. Therefore, the amount of biting into the core wire can be ensured at both ends of the tip biting portion, and stable contact reliability can be obtained at both ends of the tip biting portion.

It is a top view which shows the expansion | deployment state of the terminal metal fitting which concerns on one Embodiment of this invention. It is a top view which shows the state which crimped the terminal metal fitting of FIG. It is the sectional view on the AA line in FIG. It is sectional drawing which shows operation which crimps a terminal metal fitting. It is a perspective view which shows the state which crimped the terminal metal fitting. It is sectional drawing corresponding to FIG. 3 which shows the state which crimped the conventional terminal metal fitting.

  Hereinafter, the present invention will be specifically described with reference to the drawings. 1 is a plan view showing a developed state of a terminal fitting according to an embodiment of the present invention, FIG. 2 is a plan view showing a state in which the terminal fitting is crimped, and FIG. 3 is a cross-sectional view taken along line AA in FIG. FIGS. 4 and 4 are cross-sectional views showing a state in which the terminal fitting is crimped, and FIG. 5 is a perspective view of the terminal fitting after crimping.

  The terminal fitting 1 is formed by pressing a thin plate material made of a conductive metal. As shown in FIG. 1, the terminal fitting 1 is formed by connecting an electric wire holding part 2, a core wire crimping part 3 and a mating terminal contact part 4 in order in the longitudinal direction.

  The electric wire holding part 2 is a part fixed to the insulating coating 5 a of the covered electric wire (hereinafter, electric wire) 5. The electric wire holding portion 2 includes a pair of side plate portions 22 extending from both side portions of the bottom plate portion 21, and the bottom plate portion 21 and the pair of side plate portions 22 are crimped around the insulating coating 5a by being crimped. Then, it is fixed to the insulating coating 5a by this pressure bonding.

  An elastic piece portion 23 is connected to the bottom plate portion 21 of the electric wire holding portion 2. As shown in FIG. 3, the elastic piece portion 23 is in an elastic state by being curved inside the electric wire holding portion 2, and is elastically pressed against the electric wire 5 in the electric wire holding portion 2.

  The core wire crimping portion 3 is fixed to the core wire 5b exposed from the electric wire 5 by peeling off the insulating coating 5a. The core wire crimping portion 3 includes a bottom plate portion 31 and a pair of side plate portions 32 extending from both side portions of the bottom plate portion 31. The bottom plate portion 31 is connected to the bottom plate portion 21 of the electric wire holding portion 2.

  As shown in FIG. 5, the core wire crimping portion 3 is crimped to the core wire 5b exposed from the end of the electric wire 5 so that the bottom plate portion 31 and the pair of side plate portions 32 are fixed to the core wire 5b by this crimping. Is done. When the core wire crimping portion 3 is crimped to the core wire 5 b, the terminal fitting 1 is electrically connected to the electric wire 5.

  The mating terminal contact portion 4 includes a bottom plate portion 41 and a pair of side plate portions 42 extending from both sides of the bottom plate portion 41, and the bottom plate portion 41 is connected to the bottom plate portion 21 of the electric wire holding portion 2 and the core wire crimping. It is connected to the bottom plate portion 31 of the portion 3. The mating terminal contact portion 4 has a hollow shape into which the mating terminal (not shown) can be inserted as shown in FIG. 3 by bending the pair of side plate portions 42. Since the mating terminal is inserted into the mating terminal contact portion 4 and contacts the mating terminal contact portion 4, the mating terminal is electrically connected to the electric wire 5 via the terminal fitting 1.

  The tip of each of the pair of side plate portions 32 in the core wire crimping portion 3 is a tip biting portion 33, and the core wire crimping portion 3 is in contact with the core wire 5b when each tip biting portion 33 is difficult to insert into the core wire 5b. It is connected by crimping. A fleshing portion 34 is formed on the leading biting portion 33 (see FIG. 1).

  As shown in FIG. 1, the fleshing portions 34 are formed by flaking at both end portions in the longitudinal direction of the electric wires 5 in the respective leading biting portions 33. As shown in FIGS. 1 and 5, the fleshing portion 34 protrudes from the end portion of the side plate portion 32. By forming the fleshing portion 34 at the tip biting portion 33, strength is imparted to the tip biting portion 33.

  The fleshing portion 34 is composed of a semicircular protrusion as depicted in an enlarged view below in FIG. 1. For example, the fleshing portion 34 is integrally formed when the terminal fitting 1 is generated from a thin plate material by pressing. . In addition, after producing | generating the metal fitting 34 by press work from the thin plate material, you may build up and build up the thickening part 34 by welding etc. FIG.

  FIG. 4 shows a caulking die 7 for caulking and connecting the core wire crimping portion 3 to the core wire 5 b of the electric wire 5. The caulking die 7 has a pedestal 7a and an anvil 7b that moves linearly in a direction approaching and moving away from the pedestal 7a. The core wire crimping portion 3 is placed on the pedestal 7 a with the side plate portion 32 rising from the bottom plate portion 31, and the core wire 5 b of the electric wire 5 is installed on the bottom plate portion 31 of the core wire crimping portion 3.

  The anvil 7 b has a caulking surface 7 c that is recessed in a curved shape, and caulks the core wire crimping portion 3 by approaching the pedestal 7 a as indicated by an arrow E. By this caulking, the side plate portion 32 is bent in the direction of the core wire 5b and the tip biting portion 33 is hard to be inserted into the core wire 5b, so that the core wire crimping portion 3 is caulked and connected to the core wire 5b.

  FIG. 5 shows a state where the core wire crimping portion 3 is caulked and connected to the core wire 5. The tip biting portion 33 is hard to insert into the core wire 5 b, and the end portion is formed with a fleshing portion 34 projecting from the side plate portion 32, and the fleshing portion 34 is inserted into the core wire 5 with the tip biting portion 33.

  Next, the operation of this embodiment will be described with reference to FIG. By crimping the core crimping portion 3 with the crimping die 7, the side plate portion 32 is crimped and extends upward, so that bell mouths 35 are inevitably formed at both ends in the longitudinal direction of the side plate portion 32. By forming the bell mouth 35, it is possible to prevent the core wire 5b from being cut by the edges of both end portions in the longitudinal direction of the side plate portion 32. Further, the space between the bell mouths 35 at both ends of the side plate portion 32 is a straight shape, and becomes a compression portion 36 that compresses the core wire 5b by pressure bonding to the core wire 5b.

  In this embodiment, fleshing portions 34 are formed at both ends in the longitudinal direction of the tip biting portion 33 at the tip of the side plate portion 32, and strength is imparted to the tip biting portion 33. For this reason, the bell mouth 35 has a small extension to both ends in the longitudinal direction, and the length L1 is smaller than the length M1 of the bell mouth 135 formed in the conventional terminal fitting 100 (see FIG. 6). (L1 <M1). Thus, as the length L1 of the bell mouth 35 is reduced, the length L2 of the compression portion 36 that compresses the core wire 5b is longer than the length M2 of the compression portion 133 of the conventional terminal fitting 100 (L2> M2). ). Since the compression portion 36 becomes long, the amount of biting of the tip biting portion 33 into the core wire 5b can be secured, and the contact area with the core wire 5b can be increased, so that a crimping range that maintains a stable compression rate can be obtained. Can do.

  In such an embodiment, since the amount of biting into the core wire 5b can be ensured, stable contact reliability with respect to the core wire 5b can be obtained. Moreover, since stable contact reliability can be obtained, the core wire crimping portion 3 can be shortened accordingly, and the terminal fitting 1 can be miniaturized.

  In FIG. 3, it is assumed that the fleshing portion 34 is formed, for example, at a dimension L <b> 1 in the longitudinal direction of the terminal fitting (the left-right direction in FIGS. 1 and 3).

  The present invention is not limited to the above embodiments, and various modifications can be made. The fleshing portion 34 may be formed only at one end of each tip biting portion 33 without being formed at both longitudinal ends of each tip biting portion 33. Moreover, in this invention, since it is sufficient if it is a terminal metal fitting of the structure crimped and connected to the core wire 5b of the electric wire 5, you may abbreviate | omit the electric wire holding | maintenance part 2 and the other party terminal contact part 4. FIG. Further, the bell mouth 35 may be formed at one end instead of at both ends in the length direction of the side plate portion 32.

DESCRIPTION OF SYMBOLS 1 Terminal metal fitting 2 Electric wire holding part 3 Core wire crimping part 4 Mating terminal contact part 5 Electric wire 5b Core wire 31 Bottom plate part 32 Side plate part 33 Tip biting part 34 Filling part 35 Bell mouth 36 Compression part

Claims (2)

A bottom plate portion on which the core wire of the electric wire terminal is placed, a pair of side plate portions extending from both side portions of the bottom plate portion, and a tip provided on the tip of the pair of side plate portions, which are difficult to press the core wire in a crimped state. A terminal fitting that has a bite portion and is crimped to an electric wire end,
A terminal fitting characterized in that a thickening portion protruding from the side plate portion is provided at an end portion of the leading end biting portion in the electric wire longitudinal direction. The terminal fitting according to claim 1,
The said metal fitting part is provided in the both ends of an electric wire longitudinal direction, The terminal metal fitting characterized by the above-mentioned.

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