JP2017152094A - Terminal member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal member which, when a conductive wire to be connected is a coating electric wire and an electric wire, can connect them.SOLUTION: Disclosed is a terminal member 1 which has a heat caulking connection part 10 for performing fusing processing on an enamel coated flat wire 40 whose peripheral surface is coated with enamel coating, and axially extends from the front to the back. This terminal member includes a caulking connection part 20 for caulking and connecting a conductive wire to the back of the heat caulking connection part 10. The heat caulking connection part 10 has a U-shaped cross-sectional superimposed structure composed of an upper surface part 12, a lower surface part 13 and a curved part 11 and the caulking connection part 20 is a hollow cylindrical body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a terminal member for connecting a bare conductor and an enamel-coated conductor.

  As a technique in this field, a technique described in Patent Document 1 is known. According to this technique, the enamel coating of the enamel-coated conductor is removed by the fusing process, and a good crimp connection is obtained between the inner conductor and the terminal member. As described above, the fusing treatment has been widely used as one of effective means for joining the enamel-coated conductive wire and the terminal member.

  Also, there is a technology for electrically bonding the terminal member and the bundle of wires by melting or carbonizing the insulation coating of each conductor by a fusing treatment to a bundle of conductors having a plurality of conductors having an insulation coating such as an enamel coating or a formal coating. This is a generally known technique.

JP 2013-175413 A

  An enamel-coated conductive wire wound around a rod-shaped electromagnet and used as a coil material of a motor is connected to a bare conductive wire at an end thereof and receives a current from a commutator. In order to electrically connect the enamel-coated conductor and the bare conductor at this joint, it is known that a fusing treatment is performed with, for example, one cylindrical terminal member. At this time, two kinds of conductors having different surface states are known. If a common connection means is used for connection, an appropriate connection state may not be obtained with the terminal member.

  For example, when the fusing conditions such as energization time, current value, and caulking load are set under the condition that the enamel coating of the enamel-coated conductor is carbonized and scattered, excessive current flows to the naked conductor that is subjected to fusing treatment at the same time. May overheat and melt. Moreover, even if it does not lead to fusing, the case where the bare wire is exposed to a high temperature, the wire strength is lowered and the quality may be lowered. Alternatively, when energized under the condition that the wire strength of the bare conductor does not decrease, the insulating coating of the enamel-coated conductor is not removed by carbonization, and a good electrical connection cannot be obtained between the enamel-coated conductor and the terminal member. There is a case.

  The present invention has been made in view of the above-described problems, and does not reduce the strength of the naked conductor even when the terminal of the naked conductor and the terminal of the enamel-coated conductor are electrically and mechanically connected. It is another object of the present invention to provide a terminal member that can appropriately carbonize and remove an insulating coating of an enamel-coated conductive wire by a fusing treatment.

  The terminal member of the present invention is (1) a terminal member having a heat caulking connecting portion for fusing a coated conductor whose peripheral surface is coated with an insulating coating, and extending axially from the front to the rear. It is characterized in that a caulking connection part for caulking and connecting a conducting wire is provided behind the cable.

According to the present invention, since the terminal member is provided with the caulking connection portion behind the heat caulking connection portion for performing the fusing treatment, the coated conductor in which the periphery of the conducting wire such as the enamel-covered conducting wire is coated with the insulating coating on the front side is fused. It can be processed and connected, and a bare conductor wire not covered with an insulating coating can be caulked and connected behind. As a result, the naked conductor is not melted or the strength of the wire is not lowered by heating due to energization, and the coated conductor covered with the insulating coating such as the enamel-coated conductor can be appropriately electrically connected by the fusing treatment.

  The heat caulking connection part may have the same connection structure as that of the caulking connection part, for example, both may be cylindrical, or different structures, for example, the caulking connection part may be a cylindrical body and the heat caulking connection part may have a different structure. It may be the case. In addition, the direction in which the coated conductor and the conductor (hereinafter sometimes referred to as a naked conductor) are connected to the terminal member may be the butting direction or the same direction.

  Preferably, the terminal member according to the present invention is (2) described in (1) characterized in that the heat-caulking connection portion has a U-shaped cross section and has an overlapping structure.

  According to the present invention, since the heat caulking connection portion of the terminal member has a U-shaped cross section and the upper and lower surfaces are overlapped, for example, when fusing a rectangular enamel-coated rectangular wire, the size of the enamel-coated rectangular wire is set. By setting the energization time, current value, and load according to the fusing process, it is possible to perform the fusing process under appropriate heat caulking conditions. As a result, an alloy layer is formed by atomic diffusion at the connection interface, and a reliable electromechanical connection is obtained.

  Preferably, the terminal member of the present invention is (3) described in (1) or (2) characterized in that the caulking connection portion is a hollow cylindrical body.

  According to the present invention, since the caulking connection portion is a hollow cylindrical body, it is suitable for caulking a naked conductor. The conductor may be a bundle of conductors in a state where a plurality of conductors are bundled, and the caulking process under the optimum caulking conditions can be performed by selecting a cylindrical body corresponding to the diameter of the bundle.

FIG. 1 is an external perspective view of a terminal member according to an embodiment of the present invention. FIG. 2 is an external perspective view in which an enamel conductor and a naked conductor are connected to the terminal member. 3 is a cross-sectional view taken along the line III-III in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 6 is an external perspective view of a terminal member according to another embodiment. 7 is a cross-sectional view taken along the line VII-VII in FIG.

  Embodiments of the present invention will be described with reference to the accompanying drawings, but the technical scope of the present invention is not limited by these embodiments, and may be implemented in various modes without departing from the spirit of the invention. Can do. FIG. 1 is an external perspective view of a terminal member according to an embodiment of the present invention. FIG. 2 is an external perspective view in which an enamel conductor and a naked conductor are connected to the terminal member. 3 is a cross-sectional view taken along the line III-III in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 6 is an external perspective view of a terminal member according to another embodiment. 7 is a cross-sectional view taken along the line VII-VII in FIG.

  The terminal member 1 is formed from a rolled metal material into a developed shape and formed by necessary plastic working. In consideration of the electrical conductivity, workability, corrosion resistance, etc. required for the terminal member 1, a copper alloy such as phosphor bronze and brass or pure copper is generally used, but it is an iron-based metal such as SUS (stainless). Good. In order to achieve corrosion resistance and electrical performance targets, the base metal surface may be treated with gold or tin plating.

The terminal member 1 is integrally formed from a rolled sheet of copper alloy, and as shown in FIG. 1, includes a heat caulking connection portion 10 at the front and a caulking connection portion 20 at the rear. The heat caulking connection portion 10 and the caulking connection portion 20 are connected by a connecting portion 60 provided therebetween, and are respectively formed at end portions of the terminal member 1 in the axial direction. The heat caulking connection portion 10 is a portion that is electrically and mechanically connected to the enamel-coated rectangular wire 40. The caulking connection portion 20 is a portion that is electrically and mechanically connected to the naked conductor 30.

  As shown in FIG. 1, the heat caulking connection portion 10 has a superposed structure in which a left side surface having a U-shaped cross section is opened, a curved portion 11 is formed on the right side surface, and an upper surface portion is formed from the upper end portion and the lower end portion. 12 and the lower surface part 13 continue. The heat caulking connection part 10 has openings on the front and rear sides, and an opening made up of the end portions of the upper surface 12 and the lower surface 13 is formed on the left side.

  As shown in FIG. 2, the heat caulking connection portion 10 is pressed by the upper surface portion 12 and the lower surface portion 13 with the curved portion 11 as a fulcrum while the enamel-covered rectangular wire 40 is held therein, and is subjected to a fusing process. . With the heat and load generated by the fusing treatment, the insulating coating of the enamel-covered rectangular wire 40 is melted and removed, and the surface of the bare rectangular wire 41 is exposed and comes into direct contact with the surface of the terminal member 1. It is fusion welded by heating by energization.

  The enamel-coated rectangular wire 40 is obtained by coating the peripheral surface of a rolled copper plate having a rectangular cross section with an enamel coating. For example, an enamel material having chemical mechanical properties such as chemical resistance and heat resistance is prepared according to the use environment, and an optimum enamel material appropriately selected from the enamel material is coated on the peripheral surface of the rolled copper plate.

  The enamel-covered rectangular wire 40 is connected to the terminal member 1 in a state where the enamel film is removed without performing a prior enamel film removal step by performing a fusing process. By the fusing treatment, the enamel film is carbonized by heat and detached from the surface of the base material of the flat wire 41. As a result, the bare wire 41 appears on the surface of the flat wire 41.

  Although the fusing device is not shown, the metal structure, which is a caulking member provided in the vertical direction of the terminal member set in the caulking device, also has the function of an electrode, and the caulking treatment is performed under heating conditions by energization. It can be done. The fusing conditions are such that the energization time, current value, load, etc. are the main parameters, and the conditions are optimized by each material such as enamel coating material type, enamel-coated rectangular wire, and terminal member.

  In the fusing process, although not shown, the terminal member 1 in a state where the enameled rectangular wire 40 is held by the heat caulking connection portion 10 is set between the upper and lower electrodes, and in this state, a load is applied through the electrode to the surface of the terminal member 1. Apply a relatively large current. Thereby, the enamel film is carbonized and removed. At the same time as the enamel coating is removed, the bare rectangular wire 41 and the terminal member 1 are heated so that they turn red when energized. At that time, an alloy layer is formed at the contact interface by atomic diffusion. As described above, an alloy layer is formed at the contact interface between the connecting member 1 and the flat wire 41 by heat and load due to the fusing treatment, so that a stronger connection state is formed compared to the caulking treatment.

  As shown in FIG. 3 and FIG. 5, the heat caulking connection portion 10 has a reliable connection state because an alloy layer is formed at the interface between the flat wire 41 and the upper surface portion 12 and the lower surface portion 13 by the fusing process. can get. A connection structure with few voids can be obtained by joining the interface closely by fusion. The design of each part of the heat caulking connection part 10 such as the shapes of the upper surface part 12 and the lower surface part 13 can be appropriately designed according to the conditions of the enamel-coated rectangular wire 40 to be subjected to the fusing process.

As shown in FIG. 3 and FIG. 5, the heat caulking connection portion 10 is indented and deformed with a slight thickness while the portions that contact the flat wire 41 of the upper surface portion 12 and the lower surface portion 13 are fused. It is getting thinner. The upper surface portion 12, the lower surface portion 13, and the flat wire 41 are softened by reddening by the fusing process and are deformed by the load in the vertical direction received at the same time, so that the above-described depression is formed. A Cu-Sn alloy layer is newly formed at the contact interface by atomic diffusion by fusion.

  As shown in FIGS. 3 and 5, the heat caulking connection portion 10 controls the connection range of the enamel-covered rectangular wire 40 to an optimum value by appropriately designing the left and right widths and the front and rear lengths of the lower surface portion 13 and the upper surface portion 12. can do.

  As shown in FIG. 1, the caulking connection portion 20 is a hollow tubular body 21, so that a tubular body 21 suitable for the caulking wire bundle 35 can be obtained by die cutting, plastic working, and edge processing. It is formed through a process such as edge brazing. The conductor bundle 35 of the bare conductor 30 is accommodated in the hollow portion and is electrically and mechanically connected by caulking from the vertical direction.

  As shown in FIGS. 4 and 5, the caulking connection portion 20 is fixed in a state in which the conductor bundle 35 of the bare conductor 30 is set therein.

  Although not shown in the drawing, the caulking connection device applies a load from above and below to the cylindrical body 21 in a state where the naked conductor bundle 35 is set to deform a predetermined portion of the cylindrical body 21 into a concave shape, thereby conducting the conductor bundle 35. Are crimped. The wire bundle 35 and the caulking connection portion 20 are electrically and mechanically connected by crimping.

  The connection condition by caulking is optimized by appropriately setting the design of the cylindrical body 21, the conductor bundle size, the caulking condition, and the like as parameters.

<Effect>
In the terminal member 1 according to the present embodiment, since the heat caulking connection portion 10 is subjected to the fusing process, the coating peeling work of the enamel-covered rectangular wire 40 can be omitted.
Since the terminal member 1 of the present embodiment is provided with the heat caulking connection portion 10 and the caulking connection portion 20, it is possible to suppress a decrease in strength of the naked conductor 30 due to the influence of heat.

Since the terminal member 1 of the present embodiment has a U-shaped cross section and is an overlapping structure, a reliable shape can be secured with respect to the enamel-covered rectangular wire 40.
In the terminal member 1 of the present embodiment, optimized fusing conditions can be obtained by appropriately selecting the shape of the heat caulking connection portion 0 according to the size of the enamel-covered rectangular wire 40.

<Other embodiments>
The case where the enamel-coated conductor is a conductor bundle 55 of the enamel-coated conductor 50 is shown in FIGS. FIG. 6 is an external perspective view of a terminal member according to another embodiment. 7 is a cross-sectional view taken along the line VII-VII in FIG.
As shown in FIGS. 6 and 7, the terminal member 100 includes a heat caulking connection part 110 and a caulking connection part 20. The heat caulking connection part 110 is a hollow cylindrical body.

As shown in FIG. 7, the enamel-coated conductor is a conductor bundle 55 of conductors 50 whose surface is enamel-coated. The enamel-coated conductive wire set in the cylindrical body is subjected to a fusing treatment, and the enamel coating is carbonized and removed, and the naked conductive wire 50 is heated and pressurized to melt at the conductive wires 50 and at the interface between the conductive wire 50 and the cylindrical body peripheral surface. An attachment occurs and the electromechanical connection occurs.
Even if the embodiment is changed in this way, the above-described effects can be obtained.

DESCRIPTION OF SYMBOLS 1,100 Terminal member 10,110 Heat caulking connection part 11 Bending part 12 Upper surface part 13 Lower surface part 20 Caulking connection part 21 Cylindrical body 30 Conductor 35 Conductor bundle 40 Enamel covering rectangular wire 41 Rectangular wire 50 Enamel covering conductor 55 Enamel covering conductor Bundle 60 connection part

Claims (3)

A terminal member having a heat caulking connection part for fusing the coated conductor whose peripheral surface is coated with an insulating film, and extending axially from the front to the rear;
A terminal member having a feature in that a caulking connection portion for caulking and connecting a conductive wire is provided behind the heat caulking portion. The terminal member according to claim 1, wherein the heat caulking portion has a U-shaped cross section and has an overlapping structure. The terminal member according to claim 1, wherein the caulking connection portion is a hollow cylindrical body.

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