JP2005168217A - Terminal structure and terminal member of wire for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal structure and a terminal member of a wire for automobile, in which insulation characteristics can be improved by relaxing the concentration of the lines of electric force at the terminal of the wire for the automobile. <P>SOLUTION: The terminal structure of a wire for automobile comprises a wire for automobile, having an insulation layer 130 and an outer semiconductive layer 140, and a terminal member 200 fixed to the outside of the exposed outer semiconductive layer 140 and insulation layer 130, while touching both layers in the terminal of that wire. The terminal member 200 comprises a plurality of split pieces 210A and 210B being formed into a hollow body when they are closed, and an open/close mechanism (coupling band) 240 for coupling the split pieces to open/close freely. The terminal member further comprises a circular cone semiconductive part 230 connected with the outer semiconductive layer 140 of the wire, and an insulating part 220 arranged on the insulation layer 130 of the wire integrally with the semiconductive part 230. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a terminal structure of an automobile electric wire and an automobile electric wire terminal member.

  Conventionally, the wire shown in FIG. 10 is known as an electric wire for a wire harness of an automobile. This includes a conductor 110, an insulating layer 130, a shield layer 150, and a sheath 160 in order from the center side (for example, Patent Document 1). Of these, a braided material of a thin metal wire is generally used for the shield layer 150. Such electric wires are used not only for automobiles using ordinary internal combustion engines but also for electric cars and hybrid cars. For example, in a hybrid vehicle, a direct current of 288V is supplied from a battery to an inverter, converted into a three-phase alternating current by the inverter, and supplied to a motor for driving the vehicle. When the vehicle decelerates, the motor functions as a generator, and the generated regenerative power is supplied to the inverter and converted into direct current to be used for charging the battery.

JP-A-6-124608 (FIG. 17)

  However, the above-described electric wire has a problem that electric field concentration occurs at the terminal portion, and partial discharge is likely to occur and the accompanying breakdown is likely to develop.

  As shown in FIG. 11, when the terminal process is performed, each coating layer of the electric wire is stripped. At this time, the lines of electric force concentrate particularly on the terminal of the shield layer 150, and the potential gradient of the insulating layer 130 near the terminal of the shield layer increases. The broken lines in the figure are electric lines of force, and the alternate long and short dashed lines are equipotential lines. As a result, the withstand voltage characteristic of the electric wire itself is lowered, which causes a deterioration of insulation and a breakdown. In particular, these problems become more prominent when high voltage support is taken into consideration.

  Therefore, the main object of the present invention is to provide a terminal structure for an automobile electric wire and a terminal member for an automobile electric wire that can alleviate the concentration of electric lines of force at the terminal of an automobile electric wire and improve insulation characteristics. There is to do.

  The present invention achieves the above object by using a member that relaxes the concentration of the lines of electric force at the terminal of the electric wire for automobiles, and making this member easy to attach to the electric wire.

  The terminal structure of an automotive electric wire according to the present invention includes an automotive electric cable having an insulating layer and an external semiconductive layer, and the outer end of the exposed external semiconductive layer and insulating layer at the end of the electric wire in contact with both layers. And a terminal member to be mounted. The terminal member includes a plurality of divided pieces formed in a hollow body by being closed, and an opening / closing mechanism that connects the divided pieces so as to be freely opened and closed. Further, the terminal member has a semiconducting portion having a conical surface shape and connected to the outer semiconductive layer of the electric wire, and an insulating portion arranged on the insulating layer of the electric wire integrally with the semiconductive portion. It is characterized by having.

  Moreover, the terminal member of the electric wire for motor vehicles of this invention is a terminal member of the electric wire for motor vehicles attached to the terminal of the electric wire for motor vehicles which exposed the external semiconductive layer and the insulating layer in contact with these both layers. The terminal member includes a plurality of divided pieces formed in a hollow body by being closed, and an opening / closing mechanism that connects the divided pieces so as to be freely opened and closed. Further, the terminal member has a semiconducting portion having a conical surface shape and connected to the outer semiconductive layer of the electric wire, and an insulating portion arranged on the insulating layer of the electric wire integrally with the semiconductive portion. It is characterized by having.

  Thus, the terminal member which has the semiconductive part which has a conical surface shape, and the insulating part integral with this semiconductive part is provided in the terminal part of an electric wire, and this semiconductive part is connected with the external semiconductive layer of an electric wire. That is, with this configuration, the stress cone is formed at the end portion of the electric wire, so that the electric field concentration at the end portion of the shield layer and the end portion of the external semiconductive layer can be alleviated and the insulation characteristics of the end structure can be improved.

  Hereinafter, the terminal structure of the present invention or the structure of the terminal member will be described in more detail.

(Terminal member)
<Divided piece>
The terminal member is composed of a plurality of divided pieces. Typically, each divided piece is configured in a hollow conical shape so as to be covered with an electric wire when combined. That is, each divided piece has a shape in which one end is tapered and the cross-sectional shape is surrounded by two concentric arcs and a radial straight line connecting the ends of the arcs. In general, the number of divided pieces is preferably two. In that case, it can mount | wear easily by pinching an electric wire with two division | segmentation pieces. In particular, the use of the open / close-type divided pieces is significantly superior to the case where the stress cone is formed by manually winding the insulating tape and the semiconductive tape. Of course, you may comprise a terminal member with three or more division | segmentation pieces.

  Each of these divided pieces includes a semiconductive portion and an insulating portion. Usually, the semiconductive portion is formed on the outer peripheral side of the terminal member, and the insulating portion is formed on the inner peripheral side of the semiconductive portion. The semiconductive portion has a conical surface shape. In particular, the semiconductive portion is preferably arranged so that a part of the semiconductive portion is exposed on the inner peripheral side of the terminal member, and is configured to be easily connected to the external semiconductive layer of the electric wire. By forming the semiconductive portion in the shape of a conical surface, it is possible to effectively alleviate the concentration of electric lines of force around the end of the shield layer or the external semiconductive layer when connected to the external semiconductive layer of the electric wire. .

The volume resistivity of the semiconductive portion is preferably 1 × 10 ³ to 1 × 10 ⁵ Ω · cm. Ensuring such a resistivity is desirable in terms of matching the resistivity with the outer semiconductive layer of the electric wire and reducing electric field concentration. Below the lower limit of the resistivity, Joule heat is generated due to current flowing through the semiconductive portion. On the other hand, if the upper limit is exceeded, the resistivity becomes too high, and the effect of relaxing the potential gradient around the edge of the shield layer and around the edge of the external semiconductive layer cannot be expected sufficiently.

  On the other hand, the insulating part is formed integrally with the semiconductive part. Usually, the insulating part is formed in a hollow conical shape when the divided pieces are combined. In other words, the insulating portion has a recess into which the electric wire is fitted on the inner peripheral side.

  Moreover, it is preferable that the joining surface of each division | segmentation piece is an uneven | corrugated surface matched with the joining surface of an adjacent division piece. Since the terminal member is configured by combining a plurality of divided pieces, a joining surface between the divided pieces is inevitably generated. In order to increase the creepage distance of the joint surface and enhance the insulation characteristics, the joint surface is preferably formed on an uneven surface. The uneven surface may be, for example, a wave shape constituted by a continuous curved surface, and may simply have a shape that is in close contact with adjacent divided pieces, or may have a shape that engages with each other and also has a lock mechanism that will be described later. Further, since the uneven surface is intended to increase the creepage distance of the joint surface, it is effective to form it on a part of the joint surface, but it is more preferable to form the uneven surface over the entire surface. .

<Opening and closing mechanism>
Each of the divided pieces is connected to each other by a connecting mechanism so as to be opened and closed. The opening / closing mechanism may be any mechanism that can connect a plurality of divided pieces in a hinge shape. A typical example is a flexible connecting band that connects the divided pieces. This opening / closing mechanism is preferably made of an insulating material. For example, polyethylene or polypropylene can be used.

<Lock mechanism>
The terminal member can be attached to the electric wire by closing the plurality of divided pieces so as to cover the electric wire, but it is necessary to hold the divided pieces in a closed state. Therefore, it is preferable that the terminal member has a lock mechanism that holds the divided pieces in a closed state.

  The lock mechanism is not particularly limited as long as it can hold each divided piece in a closed state by engagement between the divided pieces. For example, it is conceivable that the lock mechanism is provided on the outer peripheral side of the terminal member or on the joint surface of each divided piece.

  As an example of the lock mechanism provided on the outer peripheral side of the terminal member, an engagement convex portion is formed on the outer periphery of one of the divided pieces to be joined, and an engagement concave portion is formed on the outer periphery of the other divided piece. The structure which hold | maintains the division piece in the closed state by engaging a convex part and an engagement recessed part is mentioned. By forming a lock mechanism on the outer peripheral side of the terminal member, each divided piece can be easily locked and unlocked, and it can be easily confirmed that it is locked.

  On the other hand, as an example of the lock mechanism provided on the joint surface of the split piece, an engagement convex portion is formed on the joint surface of one split piece to be joined, and an engagement concave portion is formed on the joint surface of the other split piece. The structure which hold | maintains the division piece in the closed state by engaging these engagement convex parts and engagement concave parts is mentioned. By forming a lock mechanism on the inner peripheral side of the terminal member, the divided pieces can be held closed without providing protrusions on the outer peripheral side of the terminal member, and the electric field distribution around the terminal portion can be made more uniform. Is possible. In this case, the engaging convex portion and the engaging concave portion may be formed on a part of the joint surface instead of the entire surface.

  The material of the lock mechanism is preferably an insulating material. For example, polyethylene or polypropylene can be used. When the lock mechanism is not used, although it is a little troublesome, it is possible to prevent the divided pieces from opening by winding a tape around the outer periphery of the closed divided pieces.

<Manufacturing method>
Such a terminal member can be formed by a mold. For example, the insulating part of the split piece, the opening / closing mechanism, and the lock mechanism are previously formed integrally with an insulating material by molding. When a terminal member has a pair of division | segmentation piece, it shape | molds in the state which opened both division | segmentation pieces. That is, the inner shape of the mold is configured such that the engaging convex portion of the locking mechanism extends over the horizontal dividing surface of the upper and lower molds, and the engaging concave portion and the opening / closing mechanism are substantially along the horizontal dividing surface of the upper and lower molds. Thereby, when the upper and lower molds are opened, the molded product can be extracted from the mold without any trouble. When the engaging recess is cylindrical, a core may be used to form the inner peripheral hole. Next, the obtained molded product is inserted into another mold, and the semiconductive portion may be formed on the outer periphery of the insulating portion with a semiconductive material.

<Attached state to the wire terminal>
The terminal member is attached to the terminal of the automobile electric wire from which the external semiconductive layer and the insulating layer are exposed, in contact with both the layers. That is, the semiconductive portion of the terminal member is connected to the external semiconductive layer of the electric wire, and the insulating portion of the terminal member is disposed on the insulating layer of the electric wire.

(Automotive wire)
<Basic configuration>
The electric wire used for the terminal structure of the present invention basically has a conductor, an insulating layer, an external semiconductive layer, and a shield layer.

<Conductor>
The conductor is not particularly limited in material and configuration as long as the necessary power transmission capacity can be secured. Examples of the material include copper wire, tin-plated copper wire, aluminum wire, aluminum alloy wire, steel core aluminum wire, copper fly wire, nickel-plated copper wire, silver-plated copper wire, and copper-covered aluminum wire. As the configuration of the conductor, a single wire and a stranded wire are conceivable, but generally a stranded wire structure in which a plurality of strands are combined is preferable.

<Insulating layer>
The insulating layer is configured to have voltage resistance according to the voltage of the electric wire. Examples of the material for the insulating layer include ethylene propylene rubber, vinyl resin (eg, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, etc.), polystyrene, polyethylene, chlorosulfonated polyethylene rubber, silicon rubber, polytetrafluoroethylene, and the like. In particular, a cross-linked polyolefin, particularly a cross-linked polyethylene is preferred.

  This insulating layer is preferably co-extruded or tandem extruded with the internal semiconductive layer when an internal semiconductive layer to be described later is provided. By extruding the insulating layer and the internal semiconductive layer simultaneously or successively, it is possible to prevent foreign matter from entering between the two layers and the occurrence of a gap. In particular, according to the coextrusion, the internal semiconductive layer and the insulating layer can be formed by a single extrusion process. Furthermore, if the internal semiconductive layer is formed by extrusion, unlike the case where conductive cloth tape is used, there are no irregular parts such as edges or indentations on the conductive cloth tape, and the origin of the water tree is eliminated. Can do.

<External semiconductive layer>
By providing the external semiconductive layer outside the insulating layer, a minute gap at the interface between the insulating layer and the shield layer can be filled and the occurrence of partial discharge can be suppressed. Further, by eliminating these minute gaps, the starting point of water tree generation can be eliminated, and insulation deterioration due to water tree generation can be suppressed.

  The outer semiconductive layer is preferably composed of a mixture of a resin and a conductive filler. Predetermined conductivity can be imparted to the semiconductive layer by mixing conductive fillers. The resin is preferably at least one selected from the group consisting of polyethylene, polyvinyl chloride, and polyvinyl acetate. Carbon black can be suitably used as the filler.

  Other suitable materials for the external semiconductive layer are those described in JP-A-6-203651. That is, it was selected from the group consisting of (A) an ethylene-vinyl acetate copolymer having a vinyl acetate content of 30 to 70% by mass and an ethylene-ethyl acrylate copolymer having an ethyl acrylate content of 20 to 40% by mass. (B) 20 to 100 parts by weight of conductive carbon black, and (C) at least one epoxy group in the molecule, and a melting point of 40 ° C. or more with respect to 100 parts by weight of at least one copolymer. It is a composition containing 0.5 to 50 parts by weight of an epoxy compound.

The volume resistivity of the outer semiconductive layer is preferably 1 × 10 ³ to 1 × 10 ⁵ Ω · cm. Ensuring such a resistivity is desirable in terms of suppressing partial discharge. Below the lower limit of the resistivity, Joule heat is generated due to current flowing through the semiconductive layer. On the contrary, if the upper limit is exceeded, the resistivity becomes too high, and the effect of relaxing the potential gradient at the interface between the conductor and the shield layer or the interface between the conductor and the insulating layer cannot be sufficiently expected.

<Internal semiconductive layer>
Furthermore, an internal semiconductive layer may be provided between the conductor and the insulating layer. By providing the internal semiconductive layer, it is possible to suppress the occurrence of partial discharge and water tree between the conductor and the insulating layer. Preferred constituent materials and resistivity of the internal semiconductive layer are the same as those of the external semiconductive layer described above.

<Shield layer>
For the shield layer, a braided material of a metal wire such as a copper wire can be used. By providing the shield layer, guidance prevention shielding and danger prevention shielding can be performed.

<Sheath>
In addition, a sheath may be provided on the shield layer. By providing the sheath, the shield layer can be mechanically protected. The sheath is generally made of chloroprene rubber, vinyl resin, polyethylene or the like.

<Wire application>
The electric wires for automobiles used in the terminal structure of the present invention include electric wires used in electric vehicles or hybrid cars as well as electric wires used in automobiles using an internal combustion engine such as a gasoline engine. In the case of an electric vehicle or a hybrid car, typically, an electric wire connecting between a battery, an inverter, a traveling motor, a generator, and the like can be given. It is particularly suitable for use in high voltage applications. For example, utilization at 400 V or higher, more preferably 600 V or higher, and even more preferably 1 kV or higher can be expected.

  According to the terminal structure of the present invention, the concentration of electric lines of force at the end of the shield layer and the end of the external semiconductive layer at the end of the electric wire for automobiles can be alleviated and the insulation characteristics can be enhanced. The terminal member of the present invention is an optimal structural member for forming the above terminal structure, and can be easily attached to the electric wire terminal.

  Hereinafter, embodiments of the terminal structure of the present invention will be described.

  First, the structure of the electric wire used for this terminal structure will be described. FIG. 1 is a cross-sectional view of a wire harness wire used in the terminal structure of the present invention.

  The electric wire includes a conductor 110, an inner semiconductive layer 120, an insulating layer 130, an outer semiconductive layer 140, a shield layer 150, and a sheath 160 in this order from the center.

  Here, 19 strands of 0.32 mm diameter annealed copper wire were combined to form a twisted strand, and further, 19 strands were combined to form a conductor 110 having a nominal cross-sectional area of 30 sq.

An internal semiconductive layer 120 is formed immediately above the conductor 110. As the material, a mixture of polyethylene and carbon black was used. The obtained internal semiconductive layer 120 has a thickness of 0.3 mm and a volume resistivity of 1 × 10 ⁴ Ω · cm. The internal semiconductive layer 120 was formed by coextrusion with an insulating layer described below.

  An insulating layer 130 is formed on the inner semiconductive layer 120. The material of the insulating layer 130 is polyethylene, and its thickness is 1.1 mm. Since the insulating layer 130 is formed by co-extrusion with the inner semiconductive layer 120, there is little possibility that foreign matter is mixed or a gap is formed between both layers, which is more effective in suppressing partial discharge.

  Subsequently, the insulating layer is crosslinked. Here, the insulating layer was irradiated with an electron beam for crosslinking. As a result, the insulating layer solidified and its melting point increased. The melting point of the insulating layer before cross-linking is about 120 ° C., and the same melting point after cross-linking is about 150 ° C.

Next, an external semiconductive layer 140 is formed on the insulating layer 130. The outer semiconductive layer 140 was also formed by extrusion. Here, the outer semiconductive layer was extruded independently of the insulating layer (inner semiconductive layer). As the material of the outer semiconductive layer 140, a mixture of carbon black and polyvinyl chloride was used. The obtained outer semiconductive layer 140 has a thickness of 0.3 mm and a volume resistivity of 1 × 10 ⁴ Ω · cm.

  A shield layer 150 is formed on the outer semiconductive layer 140. For the shield layer 150, a braided material made of an annealed copper wire having a diameter of 0.32 mm was used.

  Then, a sheath 160 is formed on the shield layer 150. Here, the sheath 160 was formed by extruding polyvinyl chloride to a thickness of 1.0 mm.

  Next, the configuration of the terminal member will be described. FIG. 2 is an end view on the large diameter side showing the terminal member with the split piece open, FIG. 3 is an end view on the large diameter side showing the terminal member with the split piece closed, and FIG. 4 is a longitudinal section of the terminal member. FIG.

  As shown in FIG. 2 and FIG. 3, the terminal member 200 of the present invention has a configuration in which two divided pieces 210A and 210B are connected to each other by a flexible connecting band 240 (opening / closing mechanism) so as to be opened and closed. And a lock mechanism 250 that holds the device in a closed state.

Each of the divided pieces 210A and 210B has a shape obtained by dividing a truncated cone by a longitudinal section. That is, the terminal member 200 forms a hollow truncated cone shape in which one end is thin and the other end is thick in a state where the divided pieces 210A and 210B are closed (see FIG. 4). The inner peripheral side is formed of a hollow frustoconical insulating portion 220, and a thin semiconductive portion 230 is integrally attached to the outer periphery of the insulating portion 220. In this example, the insulating part 220 is made of polyethylene, and the semiconductive part 230 is made of polyethylene and carbon black. The thickness of the semiconductive portion 230 is 1.0 mm. The semiconductive portion 230 protrudes to the narrower diameter side than one end of the insulating portion 220, and a step is formed between one end of the insulating portion 220 and the protruding portion of the semiconductive portion 230. By having this step, when the end of the above-described electric wire is peeled off, the insulating portion 220 is brought into close contact with the insulating layer 130 (see FIG. 1) of the electric wire, and the semiconductive portion 230 is connected to the outer semiconductive layer 140 ( (See Fig. 1). The volume resistivity of the semiconductive portion 230 in this example was also 1 × 10 ⁴ Ω · cm. Further, the semiconductive portion 230 does not cover the entire circumference of the insulating portion 220. Of the outer peripheral surface of the terminal member 200, the periphery of a connecting band 240 and a lock mechanism 250, which will be described later, is constituted by an insulating portion 220.

  The pair of divided pieces 210A and 210B are connected by a connecting band 240. The connecting band 240 is also integrally formed with the divided pieces 210A and 210B by a mold. The connecting band 240 is made of polyethylene and can be bent as the divided pieces 210A and 210B are opened and closed.

  On the other hand, the lock mechanism 250 is formed at a position facing the position where the connecting band 240 is provided in the terminal member. As shown in FIG. 2, in the lock mechanism 250, a rod-like engagement convex portion 251 having a bulging portion at the tip is formed on the outer peripheral edge of one divided piece 210A, and the outer peripheral edge of the other divided piece 210B. A cylindrical engagement recess 252 is formed in the part. Since the outer diameter of the bulging portion is larger than the inner diameter of the engaging concave portion 252 and the length of the portion other than the bulging portion in the engaging convex portion 251 and the length of the engaging concave portion 252 are substantially equal, If the engagement recess 252 is press-fitted, both the split pieces 210A and 210B can be held closed (see FIG. 3). This locking mechanism was also made of polyethylene.

  FIG. 5 shows a longitudinal cross-sectional view of such a terminal member 200 attached to the above-mentioned electric wire end. Each end of the electric wire is stripped of the covering layers, and the conductor 110, the internal semiconductive layer 120, and the insulation are separated from the end side. The layer 130, the outer semiconductive layer 140, and the shield layer 150 are exposed in stages. Both the insulating layer 130 and the outer semiconductive layer 140 of the electric wire end are sandwiched so as to be covered with the above-mentioned divided pieces. At that time, the engagement convex portion 251 (see FIG. 3) of the terminal member is engaged with the engagement concave portion 252 (see FIG. 3), and both split pieces 210A and 210B (see FIG. 3) are held in a closed state. So that By sandwiching the divided pieces 210A and 210B, the insulating portion 220 of the terminal member is brought into close contact with the insulating layer 130 of the electric wire, and the semiconductive portion 230 of the terminal member is brought into close contact with the outer semiconductive layer 140 of the electric wire. Thereafter, a crimp terminal (not shown) is attached to the conductor end, and the periphery of the terminal member attached to the electric wire is covered with an insulating tape or a heat shrinkable tube to complete the terminal treatment.

  FIG. 5 shows the lines of electric force and equipotential lines when the terminal member is mounted on the electric wire. A broken line indicates an electric force line, and an alternate long and short dash line indicates an equipotential line. As is apparent from this figure, the concentration of the electric lines of force around the end portions of the shield layer 150 and the outer semiconductive layer 140 is alleviated, and the potential gradient at that location is also alleviated.

  That is, in the terminal structure of the present invention, the stress cone is formed by fitting the terminal member to the wire terminal, and the electric field lines can be reduced from being concentrated on the shield layer end portion or the outer semiconductive layer end portion. Moreover, this invention terminal member can be easily mounted | worn by pinching an electric wire.

  Next, the terminal member of the present invention having a lock mechanism having a configuration different from that of the first embodiment will be described. FIG. 6 is an end view on the large diameter side showing the terminal member in a state where the divided piece is opened in Example 2, and FIG. 7 is an end view on the large diameter side showing the terminal member in a state where the divided piece is opened.

  This terminal member is also in the shape of a truncated cone and is composed of a semiconductive portion 230 and an insulating portion 220, and the other configuration is the same as that of the first embodiment except that the form of the lock mechanism is different.

  In this example, the lock mechanism is provided on the joining surface of each of the split pieces 210A and 210B. In other words, a total of four engaging convex portions 253 are provided on the surface constituted by the insulating portion 220 among the joining surfaces of one divided piece 210A, and the insulating portion 220 is constituted among the joining surfaces of the other divided piece 210B. A total of four engaging recesses 254 are formed on the surface to be mounted. The engaging convex portion 253 may be a rod-like or flat projection, for example. The engagement recess 254 has a shape and size into which the engagement protrusion 253 is fitted. The engaging convex portion 253 and the engaging concave portion 254 are also integrally formed when the terminal member is molded.

  If such split pieces 210A and 210B are closed, the engaging convex portion 253 can be engaged with the engaging concave portion 254, and both the split pieces 210A and 210B can be held closed. In particular, if a part of the engaging convex part 253 bulges out and is formed as an engaging concave part 254 corresponding to the engaging convex part 253, it is possible to effectively prevent the closed divided pieces 210A and 210B from opening. preferable.

  Next, the terminal member of the present invention in which the joining surface of each divided piece is formed in an uneven shape will be described. FIG. 8 is an end view on the large-diameter side showing a part of the terminal member in a state in which the split piece in Example 3 is opened, and FIG. 9 is a front view of the joint surface of the split piece.

  This terminal member also has a truncated cone shape and is composed of a semiconductive portion 230 and an insulating portion 220, and a plurality of divided pieces 210A and 210B are connected by a connecting mechanism, and the divided pieces 210A and 210B are held in a closed state. It is the same as that of Example 1 and Example 2 by the point which has. In FIG. 8 and FIG. 9, the connecting mechanism and the locking mechanism are omitted.

  In this example, protrusions 260 and grooves 265 along the semiconductive portion 230 are formed on the surface formed by the insulating portion 220 among the bonding surfaces of the split pieces 210A and 210B to form an uneven surface. That is, two protrusions 260 and one groove 265 are formed on the joint surface of one divided piece, and one protrusion 260 and two grooves 265 are formed on the other divided piece. The cross section of each protrusion and groove is rectangular. When such divided pieces are joined, the protrusions of one of the divided pieces are fitted into the grooves of the other divided piece, and a joining surface in a state in which the divided pieces are closed is formed to be uneven. Therefore, creepage distance can be earned and insulation performance can be improved.

  According to the terminal structure and the terminal member of the present invention, the concentration of electric lines of force at the end of the shield layer and the end of the external semiconductive layer at the end of the automobile electric wire can be alleviated, and the insulation characteristics can be enhanced. Therefore, it is expected to be applied to electric wires for use in automobile wire harnesses, particularly electric wires used to connect batteries, converters, inverters, motors, and generators of electric vehicles and hybrid vehicles.

FIG. 1 is a cross-sectional view of a wire harness wire used in the terminal structure of the present invention. FIG. 2 is an end view on the large diameter side showing the terminal member in a state where the divided pieces are opened. FIG. 3 is an end view on the large diameter side showing the terminal member in a state where the divided pieces are closed. FIG. 4 is a longitudinal sectional view of the terminal member. FIG. 5 is a longitudinal sectional view of the terminal member of FIG. FIG. 6 is an end view on the large-diameter side showing the terminal member in a state in which the split piece in Example 2 is opened. FIG. 7 is an end view on the large-diameter side showing the terminal member in a state where the divided pieces in Example 2 are closed. FIG. 8 is a partial end view of the large-diameter side of the split piece according to the third embodiment. FIG. 9 is a front view showing the joint surface of the split piece of the third embodiment. FIG. 10 is a cross-sectional view showing the structure of a conventional automobile electric wire. FIG. 11 is an explanatory diagram showing a distribution of electric lines of force at the end of the electric wire of FIG.

Explanation of symbols

100 Electric wire 110 Conductor 120 Internal semiconductive layer 130 Insulating layer 140 External semiconductive layer
150 Shield layer 160 Sheath
200 Terminal member 210A, 210B Split piece 220 Insulating part 230 Semiconductive part
240 Coupling band 250 Lock mechanism 251, 253 Engaging protrusion 252, 254 Engaging recess
260 ridge 265 groove

Claims (12)

An automotive electric wire having an insulating layer and an external semiconductive layer;
In the end of this electric wire, it has a terminal member attached in contact with both layers on the outside of the exposed external semiconductive layer and insulating layer,
This terminal member is
A plurality of divided pieces formed into a hollow body by closing,
An open / close mechanism for connecting each of the divided pieces so as to be openable and closable;
Further, the terminal member is
A semiconductive portion having a conical shape and connected to the outer semiconductive layer of the wire;
A terminal structure for an automobile electric wire, comprising an insulating portion that is integral with the semiconductive portion and disposed on an insulating layer of the electric wire.   The terminal structure of the electric wire for automobiles according to claim 1, wherein the terminal member further has a lock mechanism for holding each divided piece in a closed state.   The terminal structure for an automobile electric wire according to claim 2, wherein the lock mechanism is provided on the outer peripheral side of the terminal member.   The terminal structure of an automobile electric wire according to claim 2, wherein the lock mechanism is formed on a joint surface of each divided piece constituting the terminal member. The terminal structure of an automobile electric wire according to any one of claims 1 to 4, wherein the volume resistivity of the semiconductive portion of the terminal member is 1 x 10 ³ to 1 x 10 ⁵ Ω · cm.   The terminal structure of an automobile electric wire according to any one of claims 1 to 5, wherein a joining surface in each divided piece is an uneven surface that matches a joining surface of an adjacent divided piece. A terminal member of an automobile electric wire that is mounted in contact with these two layers on the terminal of an automobile electric wire that exposes the external semiconductive layer and the insulating layer,
This terminal member is
A plurality of divided pieces formed into a hollow body by closing,
An open / close mechanism that connects each of the divided pieces so as to be openable and closable;
Further, the terminal member is
A semiconductive portion having a conical shape and connected to the outer semiconductive layer of the wire;
A terminal member for an automotive electric wire, comprising an insulating portion that is integrated with the semiconductive portion and disposed on the insulating layer of the electric wire.   The terminal member for an automobile electric wire according to claim 7, wherein the terminal member further includes a lock mechanism for holding each divided piece in a closed state.   The terminal member for an automobile electric wire according to claim 8, wherein the lock mechanism is provided on an outer peripheral side of the terminal member.   9. The terminal member for an automobile electric wire according to claim 8, wherein the lock mechanism is formed on a joint surface of each divided piece constituting the terminal member. The volume resistivity of the semiconductive portion of the terminal member is 1 × 10 ³ to 1 × 10 ⁵ Ω · cm, and the terminal member for an automobile electric wire according to claim 7.   12. The terminal member for an automobile electric wire according to claim 7, wherein the joining surface of the insulating portion in each divided piece is an uneven surface that matches an adjacent joining surface.

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