JP2016058141A - Terminal fitting and litz wire with terminal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a structure of a barrel part 22 in a terminal fitting 2 for a Litz wire 1, to easily discharge exfoliated scum of an insulation coating of enamel or the like and a combustion gas of the insulation coating during jab immersion in a solder tub, to prevent a core wire from being projected and disconnected during temporary fixture (crimping), and to reduce connection resistance between the terminal fitting 2 and the Litz wire 1.SOLUTION: The Litz wire 1 is configured by covering a core wire 11 with a sheath 12. The terminal fitting 2 includes the barrel part 22 for temporarily fixing a core wire 11 of the Litz wire 1 by crimping. The barrel part 22 is configured as an open barrel type in which two barrel fragments 22A and 22B are caulked inside. A width L1 of abutment parts 22A1 and 22B1 which are abutted to each other, of the barrel fragments 22A and 22B in a direction of a Litz wire axis P is made narrower than a full width W of the barrel part 22 in the direction of the Litz wire axis P, and a gap part 222 in which a part of the core wire 11 is exposed is provided. The exfoliated scum of the enamel and the combustion gas are discharged from the gap part 222.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a litz wire terminal fitting connected to a core wire of a litz wire formed by twisting strands having an insulating film applied thereto, and a litz wire with a terminal fitting to which the terminal fitting is connected.

  Conventionally, a litz wire has been used to suppress an increase in AC resistance due to a skin effect and proximity effect peculiar to a high-frequency current with respect to a conducting wire. This litz wire is obtained by twisting strands to which an insulating film is applied. For example, as disclosed in Japanese Patent Laid-Open No. 2014-44832 (Patent Document 1), the litz wire has a litz wire. Wire terminal fittings are connected.

  FIG. 9 is a diagram illustrating an example of a conventional litz wire terminal fitting and a litz wire. As shown in the figure, the litz wire 1 is composed of a core wire 11 that is an assembly in which a large number of strands 111 with an insulating film such as enamel are twisted, and a jacket 12 that covers the outer periphery of the core wire 11. Has been. The terminal fitting 4 is a so-called closed-barrel type round crimp that includes a ring-shaped connection portion 41 connected to a power supply terminal of an electronic device and a cylindrical barrel portion 42 connected to the connection portion 41. Terminal.

  The connection between the litz wire 1 and the terminal fitting 4 is performed as follows. As shown in FIG. 9, a terminal portion that is a portion exposed from the jacket 12 of the core wire 11 of the litz wire 1 is inserted into the barrel portion 42 of the terminal fitting 4. Next, as shown in FIG. 10, the barrel part 42 is crimped and crimped to the core wire 11 of the terminal part. Thereby, the terminal metal fitting 4 is temporarily fixed to the litz wire 1. Thus, the crimping of the terminal fitting 4 and the terminal portion uses a closed barrel type terminal fitting 4 so that the strand 111 does not protrude because the strand of the litz wire is thinner than a general electric wire, and the barrel portion 42 Is clipped.

  Next, the temporarily fixed terminal fitting 4 and the terminal portion are immersed in a high-temperature solder bath. At this time, the enamel of the wire 111 is peeled off by the heat of the solder, and the wire 111 and the terminal fitting 4 are electrically connected by the solder. In this manner, the enamel coating is peeled off and the solder connection is performed simultaneously by the process of immersion in the solder bath (hereinafter referred to as “jab immersion”).

JP 2014-44832 A

  In the conventional closed barrel type terminal fitting 4, enamel combustion gas and enamel peeling debris are partially ejected from the barrel portion 42 as shown in FIG. However, in the conventional terminal fitting 4, due to the shape of the barrel portion 42, it is difficult for the enamel peeling debris and enamel combustion gas to escape from the barrel portion 42, and the connection resistance is likely to increase.

  In view of the above-mentioned problems, the present invention improves the structure of the barrel part in the terminal fitting for litz wire, and facilitates the release of combustion debris from the insulating film such as enamel and the combustion gas from the insulating film when immersed in the jab. An object is to reduce the connection resistance between the terminal fitting and the litz wire.

  The terminal fitting according to claim 1 is a terminal fitting for connecting to a core wire of a litz wire formed by twisting a plurality of strands coated with an insulating film, and temporarily connecting the core wire of the strand of the litz wire by crimping. It has a barrel part for stopping, and a gap part is provided in the barrel part to expose a part of the core wire when the core wire is temporarily fixed.

  The terminal fitting of claim 2 is the terminal fitting according to claim 1, wherein the barrel portion is an open barrel type in which two barrel pieces located on both sides of a core wire are caulked inward, and the two The gap portion is provided by making the width of the abutting portions of the barrel pieces butted against each other shorter than the entire width of the barrel portion in the litz wire axis direction.

  A terminal fitting according to a third aspect is the terminal fitting according to the second aspect, wherein R is attached to the end portions of the abutting portions of the two barrel pieces.

  A litz wire with a terminal metal fitting according to a fourth aspect uses the terminal metal fitting according to any one of the first to third aspects, and crimps the barrel portion of the terminal metal fitting to the core wire, and the terminal metal fitting and the core wire. It is characterized by being connected by solder.

  According to the terminal metal fitting of claim 1, since the gap portion is provided in the barrel portion so that a part of the core wire is exposed when the core wire of the litz wire is temporarily fixed. It becomes easy to peel off the debris of the insulating film such as enamel applied to the strand of the wire and discharge the combustion gas of the insulating film, and reduce the connection resistance between the terminal fitting and the litz wire.

  According to the terminal fitting of claim 2, in addition to the effect of claim 1, the barrel portion is an open barrel type in which two barrel pieces positioned on both sides of the core wire are crimped inward, and the core wire of the litz wire is It can be easily fitted into the part, and can be crimped by crimping the abutting parts of the two barrel pieces so as to abut each other. Disconnection or the like can be prevented.

  According to the terminal fitting of claim 3, in addition to the effect of claim 2, R is attached to the end (edge) of the contact portion of the two barrel pieces of the barrel portion. It can prevent that an edge part bites into the bundle | flux of a core wire deeply, and can prevent that a core wire protrudes.

  According to the litz wire with the terminal metal fitting of claim 4, the connection resistance between the terminal metal fitting and the litz wire can be reduced as in the case of claim 1, and when the terminal metal fitting is connected, Similar effects can be obtained.

It is the front view and top view which show the terminal metal fitting of 1st Embodiment of this invention, and the temporarily fixed state of a litz wire. It is a perspective view before temporary fixing of the terminal metal fitting of a 1st embodiment. It is a top view of the litz wire with a terminal metal fitting after the solder connection of 1st Embodiment. It is the front view and top view which show the terminal metal fitting of a 2nd Embodiment of this invention, and the temporarily fixed state of a litz wire. It is the front view and top view which show the terminal metal fitting and litz wire temporary fix | stop state of 3rd Embodiment of this invention. It is the front view and top view which show the terminal metal fitting of 4th Embodiment of this invention, and the temporary fix | stop state of a litz wire. It is a figure explaining the problem at the time of insertion of the core wire in the case of a closed barrel type. It is a figure explaining the problem of the protrusion of the core wire in the case of F clamp open type barrel type. It is a figure which shows an example of the terminal metal fittings and litz wire for the conventional litz wire. It is a figure which shows the temporary fix | stop state of the terminal metal fitting for conventional Litz wires. It is a figure explaining the ejection of the enamel combustion gas and the enamel peeling residue from the terminal fitting for conventional litz wires.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view (FIG. 1 (A)) and a plan view (FIG. 1 (B)) showing a terminal metal fitting and a litz wire temporarily fixed according to the first embodiment of the present invention, and FIG. FIG. 3 is a perspective view of the terminal metal fitting before being temporarily fixed, and FIG. In the following embodiments, the litz wire 1 is the same as the conventional litz wire 1 shown in FIGS. 9 to 11, and the same reference numerals as those in FIGS. The description which overlaps is abbreviate | omitted.

  The dashed-dotted line shown with the code | symbol "P" in FIG. 1 thru | or FIG. 3 is the center axis | shaft (henceforth a "Litz wire axis") of the litz wire 1. FIG. The terminal fitting 2 includes a ring-shaped connecting portion 21 connected to a power supply terminal or the like of an electronic device, and two barrel pieces 22A and 22B connected to the connecting portion 21. The terminal fitting 2 constitutes a barrel portion 22 that is crimped to the end portion of the core wire 11 of the litz wire 1 by crimping the barrel pieces 22A and 22B inward. That is, the terminal fitting of this embodiment is a so-called open barrel type round crimp terminal.

  In the terminal fitting 2 of the first embodiment, the contact portion 22A1 of the barrel piece 22A and the contact portion 22B1 of the barrel piece 22B are inclined in opposite directions, as shown in FIG. 1 (B). In addition, the contact portion 22A1 and the contact portion 22B1 are abutted against each other by caulking. The abutting portion 22A1 and the abutting portion 22B1 in the abutted state are inclined with respect to the litz wire axis P. The width L1 of the abutment portion 22A1 (22B1) in the litz wire axis P direction is shorter than the overall width W of the barrel portion 22 in the litz wire axis P direction. Thereby, the gap part 222 (2 places) is provided in the barrel part 22 so that it may be enclosed by the dashed-dotted line circle in FIG.

  Thus, the gap part 222 (two places) which exposes a part of core wire 11 is provided in the barrel part 22 when the core wire 11 is temporarily fixed (refer FIG. 1). These gaps 222 (two locations) facilitate the removal of the debris from the insulating film such as enamel applied to the strand 111 of the litz wire 1 and the discharge of the combustion gas from the insulating film when the jab is immersed in the solder bath. To work. Moreover, R (roundness) is attached to the edge of this gap part 222 (two places), ie, the edge part of contact part 22A1, 22B1. Thereby, it can prevent that the edge part of barrel element piece 22A, 22B bites into the bundle | flux of the core wire 11 deeply, and can prevent that the strand 111 protrudes. Moreover, in this embodiment, since contact part 22A1, 22B1 is slanting, there exists an effect that the strand 111 is hard to bite (it does not protrude and does not break).

  FIG. 3 shows a case in which the barrel portion 22 of the terminal fitting 2 is crimped to the core wire 11 and temporarily fixed, and the jab is immersed in the solder bath and the terminal fitting 2 and the core wire 11 are solder-connected. . Thus, the terminal metal fitting 2 and the core wire 11 (part thereof) are litz wires with terminal metal fittings in which the solder adhesion portions 3 are formed.

  FIG. 4 is a front view (FIG. 4 (A)) and a plan view (FIG. 4 (B)) showing a terminal metal fitting and a litz wire temporarily fixed state of the second embodiment of the present invention. In the following embodiments, elements similar to those in the first embodiment and corresponding elements are denoted by the same reference numerals as those in FIG. 1 and detailed description thereof is omitted.

  The terminal fitting 2 of the second embodiment is also an open barrel type round crimp terminal that forms the barrel portion 22 with the two barrel pieces 22A and 22B. The terminal fitting 2 of the second embodiment has a contact portion 22A11, 22A12 separated into two at the center on the barrel piece 22A, and a contact portion separated into two at the center on the barrel piece 22B. 22B11 and 22B12. The width L2 of the abutment portions 22A11, 22A12 (22B11, 22B12) in the litz wire axis P direction is shorter than the overall width W of the barrel portion 22 in the litz wire axis P direction. As a result, a gap portion 223 is provided in the barrel portion 22 as enclosed by an alternate long and short dash line ellipse in FIG.

  As described above, the barrel portion 22 is provided with the gap portion 223 that exposes a part of the core wire 11 when the core wire 11 is temporarily fixed (see FIG. 4). Accordingly, as in the first embodiment, the gap 223 functions to facilitate the release of the insulating film peeling residue and the combustion gas from the insulating film. In particular, since the gap portion 223 is provided in the central portion, degassing and degassing of the central portion of the barrel portion 22 can be performed efficiently. Moreover, since R is attached to the end portions of the contact portions 22A11, 22A12, 22B11, 22B12, the end portions of the barrel pieces 22A, 22B can be prevented from being deeply bitten into the bundle of the core wires 11, It is possible to prevent the strand 111 from protruding.

  FIG. 5 is a front view (FIG. 5 (A)) and a plan view (FIG. 5 (B)) showing a terminal metal fitting and a litz wire temporarily fixed state of the third embodiment of the present invention. The terminal fitting 2 of the third embodiment is also an open barrel type round crimp terminal that constitutes the barrel portion 22 with two barrel pieces 22A and 22B. The terminal fitting 2 of the third embodiment forms contact portions 22A1 and 22B1 by providing steps on both sides of the barrel elements 22A and 22B. A width L3 of the abutting portion 22A1 (22B1) in the litz wire axis P direction is shorter than an overall width W of the barrel portion 22 in the litz wire axis P direction. Thereby, the gap | interval part 224 (2 places) is provided in the barrel part 22, as it enclosed with the circle of the dashed-dotted line in FIG.5 (B).

  Also in the third embodiment, similarly to the above-described embodiment, there are provided gap portions 224 (two places) that expose a part of the core wire 11 when the core wire 11 is temporarily fixed, and the gap portions 224 (two places) are provided. It works to facilitate the release of insulating film debris and the discharge of combustion gas from the insulating film. Further, since the ends of the contact portions 22A1 and 22B1 are provided with R, it is possible to prevent the end portions of the barrel element pieces 22A and 22B from deeply biting into the bundle of core wires 11, and the strand 111 is It can be prevented from protruding.

  FIG. 6 is a front view (FIG. 6 (A)) and a plan view (FIG. 6 (B)) showing a terminal metal fitting and a litz wire temporarily fixed state of the fourth embodiment of the present invention. The terminal fitting 2 of the fourth embodiment is also an open barrel type round crimp terminal that constitutes the barrel portion 22 with two barrel pieces 22A and 22B. The terminal fitting 2 of the fourth embodiment has contact portions 22A1 and 22B1 by inclining on both sides of the barrel pieces 22A and 22B, and the width of the contact portion 22A1 (22B1) in the litz wire axis P direction. L4 is shorter than the overall width W of the barrel portion 22 in the litz wire axis P direction. Thereby, the gap | interval part 225 (2 places) is provided in the barrel part 22, as it enclosed with the ellipse of the dashed-dotted line in FIG.6 (B).

  Also in the fourth embodiment, similarly to the above-described embodiment, there are provided gap portions 225 (two places) that expose a part of the core wire 11 when the core wire 11 is temporarily fixed, and the gap portions 225 (two places) are provided. It works to facilitate the release of insulating film debris and the discharge of combustion gas from the insulating film. Further, since the ends of the contact portions 22A1 and 22B1 are provided with R, it is possible to prevent the end portions of the barrel element pieces 22A and 22B from deeply biting into the bundle of core wires 11, and the strand 111 is It can be prevented from protruding.

  Here, in the case of the closed barrel type described as the conventional example, for example, as shown in FIG. 7, when the core wire 11 of the litz wire 1 is inserted into the barrel portion 42, the barrel portion 42 has a ring shape. There is a problem that the core wire 11 is easily caught and the core wire 11 is difficult to insert. If the barrel portion has a large diameter, it becomes easy to insert, but the size increases. On the other hand, since the terminal fitting 2 of the first to fourth embodiments is an open barrel type, the core wire can be easily inserted, and the terminal attaching operation can be simplified.

  Further, in order to facilitate the insertion of the core wire, for example, as shown in FIG. 8, when an F clamp / open barrel type is used, the protrusion of the strand is likely to occur particularly at the worship portion during caulking. Moreover, since the strand is thin, it is easy to disconnect. On the other hand, the terminal fitting 2 of the first to fourth embodiments is an open barrel type, and is formed into a crimped constriction in which the contact portions of the two barrel pieces are abutted and crimped. Accordingly, it is possible to prevent the wire from protruding and disconnecting during caulking.

  It should be noted that the crimping portion of the barrel portion may be crimped with a minimum crimp height so that the enamel peeling residue and the enamel combustion gas can easily escape at the time of jab immersion connection to the solder bath.

  As described above, when connecting the litz wire to the solder bath, there is no protruding wire, there is little breakage of the core wire, the core wire is easy to insert, and the enamel when the jab is immersed in the solder bath The barrel structure facilitates the discharge of exfoliation residue and enamel combustion gas. Thereby, while being able to hold down the connection resistance of the litz wire 1 and the terminal metal fitting 2 low, the open crimp barrel terminal of a confined crimp system which can make simplification of terminal attachment work compatible is realizable.

  In addition, when the barrel type is used as in each embodiment, the above-described effects can be obtained. However, the present invention is not limited to this. For example, even in the case of the closed barrel type described as the conventional example, a core wire is provided in the barrel portion. You may make it provide the clearance gap (for example, opening and notch) which exposes a part of core wire, when temporarily fixing.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention.

1 Litz wire 11 Core wire 111 Wire P Litz wire shaft 2 Terminal fitting 21 Connection portion 22 Barrel portion 22A Barrel piece 22B Barrel piece 22A1 Abutting portion 22B1 Abutting portion 222 Gap portion 3 Solder adhesion portion 223 Gap portion 225 Gap portion 225 Gap

Claims (4)

A terminal fitting for connecting to a core wire of a litz wire formed by twisting a plurality of strands to which an insulating film is applied,
A barrel portion for temporarily fixing the core wire of the litz wire by pressure bonding; and a gap portion for exposing a part of the core wire when the core wire is temporarily fixed. A terminal fitting characterized by that. The barrel part is an open barrel type that caulks inward two barrel pieces located on both sides of the core wire,
The gap portion is provided by making the width in the litz wire axis direction of the abutting portions abutted against each other by caulking of the two barrel pieces smaller than the overall width of the barrel portion in the litz wire axis direction. The terminal fitting according to claim 1, wherein the terminal fitting is characterized in that:   The terminal fitting according to claim 2, wherein R is attached to end portions of the contact portions of the two barrel pieces.   A terminal comprising the terminal fitting according to any one of claims 1 to 3, wherein the barrel portion of the terminal fitting is crimped to the core wire, and the terminal fitting and the core wire are solder-connected. Litz wire with brackets.

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