JP2005302340A - Conductive sleeve for wire connection, joint wire, swaging device for wire connection, and wire connection method - Google Patents

Abstract

A conductive sleeve for wire connection, a joint wire, a swaging device for wire connection, and a wire connection that can distinguish the terminal core portions of a plurality of coated wires from being unwound and can be improved in quality reliability. Provide a method.
A contact portion is formed on the distal end side of a conductive sleeve for wire connection, and a terminal core wire portion to be inserted is inserted into the conductive sleeve for wire connection. A trumpet-shaped flare portion 14 for guiding the terminal core wire portion 30a is formed. The outer periphery excluding the flare portion 14 is formed as a portion swept by the wire connecting swaging device, and the flare portion 14 is formed as a portion that is not swaged. The conductive sleeve 12 for wire connection is temporarily held by a pair of holders of the swaging device for wire connection, the terminal core wire portion 30a is inserted, and the conductive sleeve 12 is processed by the swaging device for wire connection while releasing the temporary holding. Move to the department.
[Selection] Figure 1

Description

  The present invention relates to a conductive sleeve for electric wire connection, a joint electric wire, a swaging device for electric wire connection, and an electric wire connection method, which are applied to electrically connect terminal core portions of a plurality of covered electric wires.

  2. Description of the Related Art Conventionally, there is a connection cap 40 including an insulating resin cap 41 and a conductive sleeve 43 accommodated in advance inside the resin cap 41 as an electric wire connecting member for interconnecting terminal core portions of a plurality of covered electric wires. (For example, Patent Document 1).

  As shown in FIG. 10, after the covered electric wire 45 is inserted from the opening 42 on the rear end side, the outer periphery of the connection cap 40 is compressed with a pressure tool (not shown), and the terminal core wire portions 45 a are interconnected. The terminal core wire portion 45a and the conductive sleeve 43 are connected.

  However, in this conventional example, since the conductive sleeve 43 is not uniformly compressed and compressed from the radial direction, the terminal core wire portion 45a is not uniformly crushed, and the contact resistance is increased. There was a problem that stable electrical performance could not be obtained.

  Another conventional example for solving the above problem is disclosed in FIG. In this conventional example, after the terminal core wire portions 55 a of the plurality of covered electric wires 55 are inserted into the connection cap 50, the connection cap 50 is uniformly compressed from the radial direction by the wire connection swaging device 57. For this reason, there is no gap between the terminal core wire portions or between the terminal core wire portion and the conductive sleeve for wire connection, so that contact reliability is increased.

  The wire connection swaging device 57 includes a plurality of dies 58 and 58 that move in a radial direction on a rotating spindle, and sandwiches a connection cap 50 between the plurality of dies 58 and 58 to compress the outer periphery. Further, a holder 59 having a funnel portion for guiding insertion of the terminal core wire portion 55a of the covered electric wire 55 is provided on the front end surfaces of the plurality of dies 58, 58.

After the connection cap 50 is temporarily held on the small diameter side of the funnel portion 59a of the holder 59, the terminal core wire portion 55a is inserted into the connection cap 50 from the insertion end while being guided by the funnel portion 59a.
Japanese Utility Model Publication No. 5-50662 (page 4-5, Fig. 1)

  However, the conventional example (second conventional example) has the following problems to be solved. In this conventional example, the wire connecting swaging device 57 is provided with a holder 59 having a funnel portion 59a, so that the terminal core wire portion 55a is inserted while being guided, but between the pair of dies 58, 58. Since the opening side of the connection cap 50 inserted into the holder is blocked by the holder 59, the quality of the connection state between the terminal core part 55a and the connection cap 50 cannot be distinguished from the outside until swaging is completed. It was. For example, when it is found that the conductive sleeve 50 is inserted between the pair of dies 58 and 58 while a part of the terminal core wire portion 55a is folded back, and the strands protrude from the resin cap 51 after swaging. was there. When such a connection failure is found, the covered electric wire 55, the conductive sleeve 53, and the resin cap 51 have to be discarded, and there has been a problem that it is wasteful cost.

  Further, when the number of the covered electric wires 55 is increased or decreased, or the thickness of the covered electric wires 55 is changed, the size of the conductive sleeve 53 is changed, and a plurality of resin caps 51 for locking the conductive sleeve 53 by press fitting or the like are prepared. There was a problem that the kind of resin cap 51 increased.

  In view of the above points, the present invention can identify that the terminal core wire portions of a plurality of covered electric wires are unraveled and protrude, thereby preventing the terminal core wire portions from protruding and improving the quality reliability. An object is to provide a conductive sleeve for connection, a joint electric wire, a swaging device for electric wire connection, and an electric wire connection method.

  In order to achieve the above object, according to the first aspect of the present invention, the terminal core wire portions of the plurality of covered electric wires are inserted into the inside from the insertion end, and the terminal core wire portions are electrically interconnected by swaging from the outer periphery. The conductive sleeve for electric wire connection is characterized in that a guide portion projecting outward in the radial direction for guiding the terminal core wire portion inserted up to the insertion end is formed at the insertion end.

  According to the above configuration, since the guide portion is formed at the insertion end of the outer periphery of the conductive sleeve for wire connection, the holder having the funnel portion shown in the second conventional example is unnecessary and inserted. The terminal core wire portion is smoothly inserted into the electric wire connecting conductive sleeve without being unwound while being guided to the insertion end by the guide portion.

  According to a second aspect of the present invention, in the conductive sleeve for electric wire connection according to the first aspect, the guide portion is formed as a non-swaging portion.

  According to the above configuration, the outer diameter of the guide portion does not change even if the number of wires increases or decreases, or the outer diameter of the swaged portion changes, so the outer diameter of the guide portion does not change. As a reference, the guide portion can be engaged with the resin cap by press fitting or the like.

  Further, the invention according to claim 3 is the conductive sleeve for connecting electric wires according to claim 1 or 2, wherein the end of the terminal core wire portion inserted therein is brought into contact with the end opposite to the insertion end. The contact part to be made is formed.

  According to the said structure, positioning of the insertion direction of a terminal core wire part is performed because a terminal core wire part contact | abuts to a contact part. In addition, without temporarily connecting the terminal core wire portion and the conductive sleeve for wire connection, it is possible to move the conductive sleeve for wire connection into the processing portion of the swaging device for wire connection by simply pushing the covered wire straight. Become.

  According to a fourth aspect of the present invention, there is provided a wire connecting conductive sleeve having a plurality of covered electric wires in which the terminal core wire portion is exposed, a guide portion that is inserted while guiding the terminal core wire portion, and the electric wire connecting conductive material. And a resin cap for covering and holding the outer peripheral portion of the guide portion with the inner surface.

  According to the said structure, the outer peripheral part of the guide part of the conductive sleeve for electric wire connection engages with the inner surface of a resin cap, and the conductive sleeve for electric wire connection is latched by the resin cap. When the guide part is formed as a part that is not swaged, the outer diameter of the guide part does not change even if the number of covered wires increases or decreases, or the thickness of the covered wire changes. Can be used as a dimensional standard.

  According to a fifth aspect of the present invention, there is provided a spindle that is rotated by a driving source, a plurality of opposing dies disposed on the spindle and moving inward in the radial direction, and movably arranged on the outer side in the radial direction of the die. And a plurality of rollers disposed on the outer side in the radial direction of the backer and in rotational contact with the backer, and the die is moved radially inward by cooperation of the backer and the roller. In the wire connection swaging device that compresses the wire connection sleeve between the plurality of dies, a guide portion that is inserted into the front side of the dies while guiding the terminal core portions of the plurality of covered wires. Temporary holding means is provided for temporarily holding the electric wire connecting conductive sleeve formed at the insertion end with the guide portion exposed to the outside.

  According to the above configuration, temporary holding of the electric wire connecting conductive sleeve, insertion of the terminal core wire portion into the electric wire connecting conductive sleeve, and swaging of the electric wire connecting conductive sleeve can be performed by the same machine.

  According to a sixth aspect of the present invention, in the swaging device for connecting an electric wire according to the fifth aspect, the temporary holding means is a pair of openable and closable holders, and the electric wires for connecting the electric wire are formed on the inner surfaces of the pair of holders. And a retractable plunger for urging the sex sleeve.

  According to the said structure, the electroconductive sleeve for electric wire connection is elastically supported with sufficient balance by the plunger. Moreover, the error and size difference of the conductive sleeve for electric wire connection are absorbed within the protruding range from the inner surface of the plunger.

  According to a seventh aspect of the present invention, in the swaging device for electric wire connection according to the fifth or sixth aspect, the electric wire connecting conductive sleeve is formed on the inner surface of a plurality of dies for swaging the electric wire connecting conductive sleeve. In the temporary holding state, an approach portion for forming the tip of the conductive sleeve for wire connection is formed.

  According to the above configuration, the temporarily holding state of the conductive sleeve for wire connection is released, and at the same time, the covered wire is pushed in, and the tip of the conductive sleeve for wire connection is guided to the approach portion of the plurality of dies while being driven by the spindle. Move smoothly in.

  The invention according to claim 8 is the wire connection swaging device according to any one of claims 5 to 7, wherein the insertion length of the conductive sleeve for wire connection inserted between the plurality of dies. It is characterized by comprising a regulating means for limiting the height.

  According to the above configuration, it is possible to leave a non-swaging portion in the electric wire connecting conductive sleeve.

  Further, according to the ninth aspect of the present invention, before swaging, the wire connecting conductive sleeve for electrically interconnecting the terminal core portions of the plurality of covered wires is opened and closed so that the insertion end side is exposed to the outside. Temporary holding with a temporary holding means, and inserting the terminal core wire portion while guiding the terminal core wire portion with a guide portion formed at the insertion end of the electric wire connecting conductive sleeve, and inserting the terminal core wire portion on the opposite side of the insertion end The temporary holding state is released after making contact with the contact portion formed at the end, and the conductive sleeve for wire connection is inserted into the processing portion of the swaging device for wire connection by the pushing force of the covered wire. It is characterized by.

  According to the above configuration, since the conductive sleeve for wire connection is temporarily held so that the insertion end is exposed to the outside, the terminal core wire portion is connected to the wire when the terminal core wire portions of the plurality of covered wires are inserted. It is possible to recognize that it has come out of contact with the end of the conductive sleeve. If the terminal core wire portion hits the end of the conductive sleeve for wire connection and is unwound, the terminal core wire portion can be extracted and reinserted to correct the unraveling and protrusion. Positioning in the insertion direction is performed by the inserted terminal core wire portion coming into contact with the contact portion. When the covered electric wire is pushed in at the same time as the temporary holding state of the electric wire connecting conductive sleeve is released, the electric wire connecting conductive sleeve is inserted into the processed portion of the electric wire connecting swaging device.

  As described above, according to the first aspect of the present invention, since the guide portion is formed at the insertion end on the outer periphery of the conductive sleeve for wire connection, the terminal core wire portion is smoothly inserted while being guided by the guide portion. In addition, they can be discerned from being unraveled and protruding. Therefore, connection failure due to unraveling or protruding of the terminal core wire portions of the plurality of covered electric wires can be prevented, and the quality reliability of the covered electric wires connected to each other can be improved. It is possible to prevent the wires, the conductive sleeve for connecting the wires, and the resin cap from being wasted.

  According to the invention described in claim 2, since the outer diameter of the guide portion does not change even if the number of wires is increased or decreased or the wire size is changed, the guide portion is defined based on the outer diameter of the guide portion. It can be engaged with the resin cap by press fitting or the like. Therefore, it is possible to share the insulating resin cap that covers and holds the conductive sleeve for wire connection. In addition, parts management is facilitated, and the connection workability of a plurality of covered electric wires connected to each other can be improved.

  Moreover, according to the invention of Claim 3, the temporary connection operation | work of the terminal core wire part and the electroconductive sleeve for electric wire connection is unnecessary. Therefore, the connection workability of the terminal core wire portion and the conductive sleeve for connecting the electric wire is improved.

  According to the invention of claim 4, the outer peripheral portion of the guide portion of the electric wire connecting conductive sleeve is engaged with the inner surface of the resin cap, whereby the electric wire connecting conductive sleeve is locked to the resin cap. . Therefore, it is possible to prevent the conductive sleeve for electric wire connection from inadvertently coming out of the resin cap while the sealing material is cured, and the conductive sleeve can be insulated and protected. In addition, when the guide portion of the conductive sleeve for wire connection is a portion that is not swaged, the guide portion that engages the resin cap can be used as a dimensional reference, and the resin cap can be shared. The number of types of resin caps can be reduced.

  According to the invention described in claim 5, the temporary holding of the conductive sleeve for wire connection, the insertion of the terminal core wire portion into the conductive sleeve for wire connection, and the swaging of the conductive sleeve for wire connection are performed with the same machine. It can be carried out. Therefore, it is possible to efficiently connect the terminal core wire portion and the conductive sleeve for connecting the electric wire.

  According to the sixth aspect of the present invention, the wire connecting conductive sleeve is elastically supported by the plunger in a balanced manner. Moreover, the error and size difference of the conductive sleeve for electric wire connection are absorbed within the protruding range from the inner surface of the plunger. Therefore, it is possible to prevent deformation and cracking of the conductive sleeve for connecting wires. Further, even if the outer diameter of the conductive sleeve for wire connection changes, the labor of exchanging the pair of holders and adjusting the distance between the pair of holders is saved, thereby improving workability.

  According to the seventh aspect of the present invention, the temporarily holding state of the electric wire connecting conductive sleeve is released, and at the same time, the covered electric wire is pushed in and the electric wire connecting conductive sleeve is inserted between the plurality of dies. Then, the tip of the conductive sleeve for wire connection is smoothly moved into the spindle while being guided by the approach portions of the plurality of dies. Therefore, following insertion of the terminal core wire portion, swaging of the conductive sleeve for electric wire connection can be performed continuously, and connection workability can be improved.

  According to the eighth aspect of the present invention, when the insertion length of the wire connecting conductive sleeve inserted between the plurality of dies is limited by the restricting means, the wire connecting conductive sleeve is not swaged. A part is left, and the part that is not swaged is used as a guide part of the conductive sleeve for wire connection, so that the outer periphery of the guide part can be used as a dimensional reference for engaging the resin cap. Therefore, the resin cap can be shared, and the types of the resin cap can be reduced.

  According to the invention of claim 9, since the conductive sleeve for wire connection is temporarily held so that its insertion end is exposed to the outside, when inserting the terminal core wire portions of the plurality of covered wires, It is possible to distinguish the terminal core wire portion from being unwound by hitting the end of the conductive sleeve for electric wire connection or the like, and in the case of overhanging, the terminal core wire portion can be reinserted. Therefore, it is possible to prevent a connection failure due to the terminal core wire portion being disconnected or protruding, and to improve the quality reliability of the interconnected covered wires. Further, it is possible to eliminate the waste of parts and the waste of cost, and the production economy is improved.

  Specific examples of embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a joint wire using a conductive sleeve (wire connection sleeve) according to the present invention, and FIGS. 3 and 4 show an embodiment of the conductive sleeve. .

  The joint electric wire 5 includes a plurality of covered electric wires 30, a conductive sleeve 12, and a resin cap 6. Collective earthing, branching, and the like are performed by electrically connecting the terminal core wire portions 30a of the plurality of covered electric wires 30.

  Each covered electric wire 30 has the covering portion 30b peeled off at the end, and the terminal core wire portion 30a is exposed to a desired length. The terminal core wire portion 30b is aligned in the same direction and is appropriately twisted so that the strand 30c cannot be unraveled. The exposed length of the terminal core wire portion 30 a is formed to be slightly shorter than the depth of the resin cap 6, and is covered and protected by the resin cap 6 after being connected to the conductive sleeve 12.

  The conductive sleeve 12 is made of a conductive metal material such as annealed copper, and a pipe piece obtained by cutting an elongated pipe material into an arbitrary dimension is formed into a predetermined shape by pressing or the like. It is. A contact portion 13 formed by crushing the pipe material is formed on the front end side of the conductive sleeve 12, and the rear end side (opening side) of the conductive sleeve 12 is directed in the direction opposite to the electric wire insertion. A flare portion (guide portion) 14 that gradually increases in diameter in a trumpet shape is formed, and a swollen body portion 15 is formed between the contact portion 13 and the flare portion 14. The inside of the trunk portion 15 is an insertion space into which the terminal core wire portion 30a is inserted without difficulty.

  The terminal core wire portion 30a of the covered electric wire 30 inserted from the opening end of the flare portion 14 is guided to the intersection of the trunk portion 15 and the flare portion 14 by the flare portion 14, and then inserted into the insertion space of the trunk portion 15. It is like that. After insertion of the electric wire, the trunk portion 15 is swaged leaving the flare portion 14 and inserted into the resin cap 6. By swaging, the outer periphery of the body portion 15 is uniformly compression-molded, thereby obtaining a perfect circular shape with small variations in the outer diameter, reducing the contact resistance of the terminal core wire portion 30a, and improving the contact reliability. It is like that.

  The resin cap 6 is made of an insulating synthetic resin material such as polyvinyl chloride, polyethylene, polypropylene, and polyamide resin as a constituent material and is formed into a bottomed cylindrical shape. In order to prevent the conductive sleeve 12 from being inadvertently pulled out during curing of the uncured resin for sealing, the outer peripheral portion of the flared portion 14 of the conductive sleeve 12 (locking) A locking claw (engagement portion) 9 that engages the portion 14a is formed.

  When the conductive sleeve 12 is inserted into the resin cap 6, the flare portion 14 rides on the locking claw 9, and when the conductive sleeve 12 is further inserted deeply, the flare portion 14 gets over the locking claw 9 and is locked. The flare portion 14 engages with the claw 9 and the conductive sleeve 12 is locked.

  In addition, as long as it can prevent careless removal of the conductive sleeve 12, it is not limited to the latching claw 9 of this embodiment shown in FIG.1 and FIG.2, and other forms are also possible. Good. For example, as shown in FIG. 9, a locking claw 9 ′ having flexibility that extends obliquely inward in the insertion direction of the conductive sleeve 12 can be provided on the inner surface of the resin cap 6 ′. Since the locking claw 9 'has flexibility toward the inner surface of the cap 6' with the base 9'a as a fulcrum, that is, outward, the conductive sleeve 12 is more smoothly inserted into the resin cap 6 '. It has become so.

  When the conductive sleeve 12 is inserted into the resin cap 6 ′, the free end portion 9 ′ b bends outward with the base portion 9 ′ as a fulcrum, and the conductive sleeve 12 is completely inserted up to the flange. The end portion 9'b is elastically restored, and the flared portion 14 of the conductive sleeve 12 comes into contact with the tip of the free end portion 9 'so that the conductive sleeve 12 is prevented from coming off.

  There is a gap between the adjacent locking claws 9 ′, and an uncured resin material for sealing flows through the resin cap 6 ′ through the gap. When the uncured resin material is uniformly filled in the resin cap 6 ′, the uncured resin material is placed between the terminal core wire portions 30 a, between the insulating coating portions 30 b, and between the terminal core wire portions 30 a and the conductive sleeve 12. It penetrates by capillary action and the gap is completely sealed.

  Next, an electric wire connection method between the terminal core wire portion 30a and the conductive sleeve 12 will be described with reference to FIGS. The electric wire connection method of the present embodiment temporarily holds the conductive sleeve 12 so that it can be seen that the terminal core wire portions 30a of the plurality of covered electric wires 30 hit the ends of the conductive sleeve 12 and protrude. This is a method in which the temporary holding is released and the conductive sleeve 12 can be smoothly moved to the processed portion of the wire connecting swaging device 20, and the conductive sleeve is exposed so that the flare portion 14 is exposed before swaging. 12 is temporarily held by a pair of openable and closable holders 26, 26, the terminal core wire portions 30a of the plurality of covered electric wires 30 are inserted while being guided by the flare portion 14, and the terminal core wire portions 30a are inserted deeply to form the conductive sleeve 12. After the temporary holding state is released, the conductive sleeve 12 is moved by the pushing force of the covered wire 30 and the processing portion of the wire connecting swaging device 20 is released. It is characterized in that the insert.

  First, the pair of holders 26, 26 are moved in the direction of arrow D, and the conductive sleeve 12 is set between the pair of holders 26, 26. Next, the pair of holders 26 and 26 are moved in the closing direction, the contact portion 29a of the plunger 29 is brought into contact with the outer periphery of the conductive sleeve 12, and the conductive sleeve 12 is temporarily held while being biased by a spring force. (FIG. 5). In the temporary holding state of the conductive sleeve 12, the flare portion 14 of the conductive sleeve 12 is exposed to the outside from the front end surfaces of the pair of holders 26 and 26, and the front end side of the conductive sleeve 12 is set to the rear end surface of the holder 26. It is made to protrude from between a pair of dies 21 and 21 by projecting from it.

  Next, the terminal core wire portion 30 a is inserted while being guided by the flare portion 14 of the conductive sleeve 12. When the terminal core wire portion 30a is inserted all the way into the back, the distal end abuts against the abutting portion 13, so that further insertion of the terminal core wire portion 30a is restricted and positioned. At the same time that the tip of the terminal core wire portion 30 a is brought into contact with the contact portion 13, the pair of holders 26, 26 are moved in the direction of arrow D to release temporary holding, and the conductive sleeve 12 is pushed into the spindle while pushing the covered electric wire 30. It is moved to the 24 side (FIG. 6). The distal end side of the conductive sleeve 12 is guided by the approach surface 21a of the pair of dies 21 and 21 to correct the axial deviation, enters the processing portion, is swaged from the distal end side to the front of the flare portion 14, and is terminated. The mutual connection of 30a and the connection of the terminal core wire portion 30a and the conductive sleeve 12 are simultaneously performed. Simultaneously with the end of swaging, by pulling the covered electric wire 55 in the direction opposite to the insertion, the conductive sleeve 12 is extracted from between the pair of dies 21 and 21, and the processing is completed.

  According to such a wire connection method, the terminal core wire portion 30a is inserted into the conductive sleeve 12 in a state where the conductive sleeve 12 is temporarily held by the pair of holders 26 and 26 before swaging. It can be discerned that the core wire portion 30a is unwound and protrudes outside, and when it protrudes outside, the terminal core wire portion 30a can be reinserted. Thereby, it is possible to prevent connection failure due to unraveling or protruding, and to improve quality reliability.

  Next, the wire connection swaging device 20 will be described. The swaging device 20 for wire connection of the present embodiment can temporarily hold the conductive sleeve 12 so that it can be recognized that the terminal core wire portion 30a has come out of contact with the end portion of the conductive sleeve 12, etc. It is effective to dispose a pair of openable and closable holders 26, 26, which are opposed to the pair of dies 21, 21, with a retractable plunger 29 on the inner surface.

  As shown in the figure, a die 21 and a backer 22 are movably held in the spindle 24 of the electric wire connecting swaging device 20 (FIG. 8). On the front side of the spindle 24, a pair of holders 26, 26 that can be opened and closed are disposed so as to face the pair of dies 21, 21 (FIG. 6). The pair of holders 26 and 26 are automatically opened and closed by an actuator (not shown) such as a motor or a cylinder based on a signal from a foot switch or the like, and the conductive sleeve 12 has a pair of dies on its tip side. It is made to enter between 21 and 21 and is temporarily held in a state where the flare portion 14 on the rear end side is exposed to the outside (FIG. 5).

  A plunger 29 having a male screw on the outer periphery is screwed into a screw hole 28 formed in the vertical direction of each holder 26. A contact portion 29a of the plunger 29 protrudes and retracts from a recess 27a (FIG. 7) on the inner surface 27 of each holder 26, and the conductive sleeve 12 is biased (elastic) at two points of the plunger 29 facing each other. Support). Although the protrusion amount δ of the contact portion 29a is arbitrary, by setting the protrusion amount δ to a predetermined value, an error in the outer diameter of the conductive sleeve 12 and a size difference of the conductive sleeve 12 are absorbed. It has become.

  A processing surface 21b and a tapered approach surface (approach portion) 21a following the processing surface 21b are formed on the inner surface of each die 21 (see FIGS. 5 and 6), and the conductive sleeve 12 has an approach surface 21a. Therefore, the shaft is smoothly inserted from the front end side while the axial deviation is corrected.

  On the back side of the die 21, a stopper (restricting means) 30 that restricts the insertion length of the conductive sleeve 12 is provided (FIG. 6). When the end of the terminal core wire portion 30a abuts against the stopper 30, further insertion of the terminal core wire portion 30a is restricted, and the flare portion 14 remains as a portion that is not swaged. The stopper 30 as the restricting means is not limited to the shape of the present embodiment, and a stopper plate or the like can be provided outside the die 21.

  As shown in FIG. 8, the backer 22 disposed on the outer side in the radial direction of the die 21 is separate from the die 21, but rotates in the direction of arrow F in cooperation with the die 21, and the radial direction (center Direction). A plurality of spherical rollers 23 are arranged outside the backer 22 so that the die 21 can move in the radial direction in cooperation with the backer 22 and the roller 23.

  The wire connection swaging device 20 operates as follows. By rotating the spindle 24, the die 21 and the backer 22 are turned, and the roller 23 is rotated. Since the backer 22 is located on the outer side in the radial direction of the die 21, the revolving backer 22 and the roller 23 come into contact with each other, and the cam surface 22 a of the backer 22 rides on the roller 23, so that the inner surface of the backer 22 becomes the die 21. Is pushed inward in the radial direction, and the die 21 strikes the outer periphery of the conductive sleeve 12.

  When the backer 22 and the roller 23 are not in contact with each other, the backer 22 slightly protrudes radially outward by centrifugal force, the die 21 is separated from the conductive sleeve 12, and the hitting by the die 21 is temporarily stopped. Again, the backer 22 and the roller 23 come into contact with each other and the above operation is repeated.

  In this way, the conductive sleeve 12 as the processing material is uniformly compressed in the radial direction, so that there is a gap between the conductive sleeve 12 and the terminal core wire portion 30a or between the terminal core wire portions 30a. Thus, the contact resistance is reduced, and stable electrical performance can be obtained.

  Next, the conductive sleeve 12 of the present embodiment will be described in detail with reference to FIGS. 3 and 4. In addition to being able to obtain stable electrical performance, the conductive sleeve 12 can distinguish that the terminal core wire portions 30a of the plurality of covered electric wires 30 that are electrically connected to each other are unraveled and protrude, resulting in poor connection. It is possible to improve the reliability of the quality without it, and a contact portion 13 with which the terminal core wire portion 30a to be inserted is contacted is formed on the front end side of the conductive sleeve 12, and the rear end side of the conductive sleeve 12 is formed. Further, a trumpet-shaped flare portion 14 for guiding the terminal core wire portion 30a to be inserted is formed.

  The abutting portion 13 is a wall portion on the back side formed by stamping with an upper die and a lower die of the press machine. In front of the contact portion 13, a protruding portion 13 a having a U-shaped cross section to which the shapes of the upper die and the lower die are transferred is formed. The tip of the terminal core wire portion 30a abuts on the abutting portion 13, and positioning in the insertion direction is performed. Further, the outer periphery of the conductive sleeve 12 is compressed, and the terminal core wire portion 30a and the conductive sleeve 12 are not temporarily connected, and the conductive sleeve 12 is simply connected by the pushing force of the covered wire 30 and the swaging device 20 for connecting the electric wire. It is designed to be inserted into the machined part.

  The flare portion 14 is formed by unrolling at the insertion end of the terminal core wire portion 30a. That is, the flare part 14 is a part that gradually increases in diameter toward the rear, and the inside is formed in a funnel shape. Therefore, the terminal core wire portion 30a to be inserted is smoothly inserted into the back side while being guided by the inner surface of the flare portion 14, so that the terminal core wire portion 30a (element wire 30c) is prevented from being unwound and protruding outside. It has become. If the terminal core wire portion 30a protrudes to the outside, the terminal core wire portion 30a can be pulled out, twisted lightly, and reinserted to correct the protrusion of the terminal core wire portion 30a. Thereby, waste of parts and waste of cost can be eliminated, and the joint electric wire 5 can be produced with good economic efficiency.

  Further, by forming the flare portion 14, it is avoided that the edge portion on the rear end side of the conductive sleeve 12 bites into the terminal core wire portion 30 a, and the terminal core wire portion 30 a is prevented from being damaged by being cut. It is also like.

  It is also a feature of the present invention that the flare portion 14 is a portion that is not swaged by the wire connecting swaging device 20, and the outer diameter of the flare portion 14 does not change before and after swaging. That is, even if the outer diameter of the trunk portion 15 is reduced by swaging, the number of covered wires is increased or decreased, or the size of the wire to be joined is changed, the outer diameter of the flare portion 14 of the conductive sleeve 12 is By always using the maximum diameter of the flare portion 14 as a dimensional reference with respect to the locking claw 9 of the resin cap 6, the engagement state of the conductive sleeve 12 and the resin cap 6 is maintained. Can now be achieved. Thereby, the kind of resin cap 6 can be reduced, component cost can be reduced, component management becomes easy, and the connection workability | operativity of the joint electric wire 5 can be improved.

  According to such a conductive sleeve 12, since the terminal core wire portion 30a is inserted while being guided by the flare portion 14 of the conductive sleeve 12, it is possible to distinguish the terminal core wire portion 30a from being unwound and protruding outward. If unraveling or protrusion is found, the terminal core wire portion 30a can be reinserted. Further, since the flare portion 14 is formed as a portion that is not swaged, the outer diameter of the flare portion 14 does not change even if the number of wires or the wire size changes, and the outer peripheral portion 14a of the flare portion 14 is the resin cap 6. Thus, the conductive sleeve 12 is locked and held by the resin cap 6, and the resin cap 6 can be shared.

In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the main point of this invention, it can variously modify and implement as follows.
(1) The conductive sleeve 12 of the present embodiment is a closed end because the contact portion 13 is formed on the distal end side, but the distal end side may be formed to be an open end. In this case, after the terminal core wire portion 30a is inserted into the conductive sleeve 12, the outer periphery is compressed by a hand tool or the like, and swaging is performed after the terminal core wire portion 30a and the conductive sleeve 12 are temporarily connected.
(2) Furthermore, the contact portion 13 can be formed on the leading end side of the conductive sleeve 12 leaving a gap to the extent that the terminal core wire portion 30a contacts. In this case, the contact portion 13 can be easily formed by bending the end portion of the conductive sleeve 12 inward.
(3) The conductive sleeve 12 of the present embodiment has a flare portion 14 that gradually increases in diameter toward the rear at the insertion end on the rear end side, and the outer peripheral portion of the flare portion 14 extends in the axial direction. It can also be extended in parallel. In this case, the outer periphery of the flare part 14 is in surface contact with the resin cap 6, and the conductive sleeve 12 is stably held by the resin cap 6.
(4) The wire connection swaging device 20 of this embodiment includes a pair of holders 26 and 26 as temporary holding means. However, the present invention is not limited to the provision of a pair of holders 26. A pair may be provided, and a plurality of holders 26 may be provided at rotationally symmetric positions.

It is an exploded view showing one embodiment of a joint electric wire concerning the present invention. It is sectional drawing which shows the state which assembled the joint electric wire shown in FIG. It is a perspective view of the electroconductive sleeve shown in FIG. It is sectional drawing cut | disconnected along the AA line of the conductive sleeve shown in FIG. FIG. 4 is a cross-sectional view showing an embodiment of the electric wire connection method according to the present invention, in which a conductive sleeve is temporarily held by a pair of holders and shows a state before swaging. FIG. 5 is a cross-sectional view showing a state in which the electric sleeve is temporarily held by releasing the temporary holding of the conductive sleeve, similarly showing an embodiment of the electric wire connection method. It is a front view of a pair of holders. It is a front view of the swaging apparatus for electric wire connection. It is sectional drawing partly cut | disconnected which shows the modification of a resin cap. It is a perspective view which shows an example of the prior art of the electroconductive sleeve for electric wire connection parts. It is sectional drawing which shows another example of the conventional of the conductive sleeve for electric wire connection.

Explanation of symbols

5 Joint wire 6 Resin cap 9 Locking claw (engagement part)
10 Opening 12 Conductive sleeve (Conductive sleeve for wire connection)
13 Contact part 14 Flare part (guide part)
14a Outer peripheral part (locking part)
DESCRIPTION OF SYMBOLS 20 Swaging apparatus for electric wire connection 24 Spindle 26 Holder 28a Plunger 30 Covered electric wire 30a Terminal core wire part 30b Covering part

Claims (9)

In the conductive sleeve for wire connection, the terminal core wire portions of the plurality of covered electric wires are inserted into the inside from the insertion end, and the terminal core wire portions are electrically interconnected by swaging from the outer periphery.
A conductive sleeve for connecting an electric wire, characterized in that a guide portion projecting outward in a radial direction for guiding the terminal core wire portion inserted to the insertion end is formed at the insertion end.   2. The conductive sleeve for connecting electric wires according to claim 1, wherein the guide portion is formed as a non-swaging portion.   The conductive sleeve for electric wire connection according to claim 1 or 2, wherein an abutting portion for abutting a tip of the terminal core wire portion inserted therein is formed at an end opposite to the insertion end. .   A plurality of covered electric wires with the terminal core wire portions exposed, a conductive sleeve for electric wire connection having a guide portion for guiding and inserting the terminal core wire portion, and an outer periphery of the guide portion while covering the conductive sleeve for electric wire connection A joint electric wire comprising: a resin cap that holds the portion engaged with the inner surface. A spindle that is rotated by a drive source; a plurality of opposing dies that are disposed on the spindle and move radially inward; and a bucker that is movably disposed radially outward of the die and contacts the dies. A plurality of rollers disposed on the outer side in the radial direction of the backer and in rotational contact with the backer, and the die is moved inward in the radial direction by the cooperation of the backer and the roller. In the wire connection swaging device that compresses the connection sleeve,
On the front side of the die, the conductive sleeve for connecting an electric wire having a guide portion formed at the insertion end for guiding the terminal core wire portions of the plurality of covered wires to the inside is exposed to the outside. A swaging device for connecting electric wires, characterized in that provisional holding means for temporarily holding the wire in a state is provided.   6. The temporary holding means is a pair of openable and closable holders, and a retractable plunger for urging the conductive sleeve for wire connection is provided on the inner surface of the pair of holders. The swaging apparatus for wire connection as described.   An approach portion is formed on the inner surface of a plurality of dies for swaging the conductive sleeve for wire connection, and the tip of the conductive sleeve for wire connection is made to enter while temporarily holding the conductive sleeve for wire connection. The swaging device for electric wire connection according to claim 5 or 6.   The wire connection screw according to any one of claims 5 to 7, further comprising a restricting means for restricting an insertion length of the conductive sleeve for wire connection inserted between the plurality of dies. Aging device.   Prior to swaging, a conductive sleeve for wire connection that electrically interconnects the terminal core wire portions of a plurality of covered wires is temporarily held by a temporary holding means that can be freely opened and closed, and the terminal core wire portion is electrically conductive for the wire connection. The guide core formed at the insertion end of the sleeve is inserted while being guided, and the terminal core wire portion is brought into contact with the contact portion formed at the end opposite to the insertion end, and then the temporary holding state is released. The electric wire connecting method, wherein the electric wire connecting conductive sleeve is inserted into the processed portion of the electric wire connecting swaging device by the pushing force of the covered electric wire.

Images