JP6670872B2 - Crimp terminal for electric wire whose core wire is made of conductive fiber, electric wire with crimp terminal, and sensor for medical equipment - Google Patents

Description

  The present invention relates to a crimp terminal in which a core wire is connected to an electric wire made of a conductive fiber, the electric wire with a crimp terminal, and a medical device sensor including the electric wire with a crimp terminal.

  BACKGROUND ART Conventionally, a crimp terminal has been known in which a plurality of crimping pieces for crimping a connected portion of an electric wire are alternately arranged at shifted positions (see Patent Document 1). Specifically, as shown in FIG. 13, the crimp terminal has a terminal connection portion 101 to which a partner terminal or the like is connected, and an electric wire connection portion 102 connected to the terminal connection portion 101 and to which an electric wire is connected (crimped). And.

  The electric wire connection portion 102 includes a bottom plate 1021 extending in the same direction (first direction) as the core wire to be arranged, and a plurality of one-side caulking pieces 1022 extending from one side edge of the bottom plate 1021 in a second direction orthogonal to the first direction. And a plurality of other-side caulking pieces 1023 extending from the other side edge of the bottom plate 1021 in the second direction. The one-side caulking pieces 1022 and the other-side caulking pieces 1023 are alternately arranged at positions shifted in the first direction.

  In this crimp terminal 100, the core wire exposed at the end of the electric wire is arranged on the bottom plate 1021, and the one-side caulking piece 1022 and the other-side caulking piece 1023 are caulked, so that the one-side caulking piece 1022 and the other-side caulking piece When the piece 1023 embraces the core wire, the core wire is crimped to the bottom plate 1021 (see FIG. 14). Thereby, the electric wire is connected to the crimp terminal.

  In the wire connection portion 102 of the crimp terminal 100 described above, a plurality of pairs of caulking pieces 1022A and 1023A arranged at the same position in the first direction as shown in FIG. 15 are arranged at intervals in the first direction. Since the contact area between the core wire and the caulking piece is increased as compared with the portion, even if the pressure at the time of caulking is suppressed, the force for holding the wire at the wire connection portion 102, in other words, the crimped wire is pulled in the pulling direction. In this case, it is possible to sufficiently secure the difficulty of pulling out the electric wire from the electric wire connection portion 102 (that is, the tensile strength).

  For this reason, the crimp terminal 100 can be used also for an electric wire having a core wire made of a soft metal such as an aluminum wire, that is, an electric wire which is easily broken when the pressure at the time of caulking is increased.

JP 2010-73346 A

  In recent years, as the electric wire to which the crimp terminal is connected, there may be a case where it is necessary to use a wire whose core wire is made of a conductive fiber such as carbon fiber instead of a metal, due to restrictions due to applications.

  When such an electric wire is connected to the crimp terminal, internal stress is hardly generated in the conductive fiber at the time of pressurization, so that internal stress is easily generated at the time of pressurization in order to secure the holding force at the connection site. The pressure at the time of caulking must be increased as compared with the case where an electric wire having a metal core wire is connected. Moreover, in such an electric wire, a very thin (for example, about several μm) conductive fiber is used. For this reason, even if the above crimp terminal 100 is used, the conductive fiber is easily broken when the caulking pieces 1022, 1023 are swaged, so that the crimp terminal 100 connected to the electric wire has sufficient tensile strength. Could not be secured.

  Therefore, the present invention provides a crimp terminal capable of sufficiently securing a tensile strength when an electric wire whose core wire is formed of a conductive fiber is crimped to a wire connection portion, the electric wire with a crimp terminal, and the electric wire with a crimp terminal. It is an object to provide a medical device sensor provided with the same.

  As a result of intensive research, the inventors of the present invention have found that when the caulked piece at the one end and the other caulked piece at the other end (reference numeral 105 in FIG. 14) are narrow, the caulked piece at the one end is It has been discovered that the conductive fiber is likely to break (at the boundary position) between the other end side crimping piece. Further, when swaged, by preventing the breakage between the one-side crimping piece and the other-side crimping piece formed at the position closest to the covering member (sheath or the like) of the electric wire in the first direction, other wires are prevented from breaking. It has also been found that a sufficient tensile strength can be ensured even if a break occurs between the crimping piece at one end and the crimping piece at the other end. Therefore, the inventors have focused on these findings and created a crimp terminal or the like having the following configuration, thereby solving the above-mentioned problems.

  The crimp terminal according to the present invention includes an electric wire connection portion capable of connecting an electric wire whose core wire made of a conductive fiber is covered with an insulating member, wherein the electric wire connection portion connects the electric wire to the electric wire connection portion. A base extending in the same direction as the part, a plurality of first caulking pieces extending from one end in a second direction orthogonal to the first direction in which the base extends in the base, and at least one extending from the other end in the second direction A second caulking piece, and the plurality of first caulking pieces and the second caulking pieces are alternately arranged at positions shifted in the first direction, and each is caulked to embrace the core wire. A position where the core wire is crimped to the base portion, and when the first caulking piece and the second caulking piece are each caulked and the core wire is connected, a position closest to the covering member of the electric wire in the first direction. To The first interval, which is the interval between the first caulking piece and the second caulking piece formed in the first direction, is the first interval between the first caulking piece and the second caulking piece formed at another position in the first direction. It is larger than the second interval, which is an interval in one direction.

  According to such a configuration, when the caulking pieces (the first caulking piece and the second caulking piece) are swaged, when the electric wire whose core wire is made of the conductive fiber is connected to the crimp terminal (wire connecting portion). In addition, since the distance between the first caulking piece and the second caulking piece formed at the position closest to the covering member of the electric wire in the first direction (first space) increases, disconnection of the conductive fiber at this position may occur. Thus, sufficient tensile strength can be ensured.

  In addition, the present inventors have found that when each caulking piece is crimped for crimping an electric wire, the edge of each caulking piece expands (see FIG. 7). And, even when the first crimping piece and the second crimping piece in a state where the edge is inflated are in contact with each other, it is easy for disconnection of the conductive fiber between the first crimping piece and the second crimping piece. Was found.

  For this reason, it is preferable that the first interval is an interval in which the first swaging piece and the second swaging piece whose edges are swollen due to caulking do not contact.

  According to this configuration, the disconnection of the conductive fiber between the first caulking piece and the second caulking piece formed at the position closest to the covering member of the electric wire in the first direction is more reliably suppressed, and thereby, As a result, a sufficient tensile strength can be secured more reliably.

  Further, in the crimp terminal, an edge between the distal end and the proximal end of the first caulking piece, and an edge between the distal end and the proximal end of the second caulking piece, It may extend in a direction intersecting the two directions.

  According to such a configuration, the edge between the distal end portion and the proximal end portion of each caulking piece is in contact with each conductive fiber so as to cross diagonally, so that it is in contact with the conductive fibers at right angles (in the second direction). As compared with the case, the contact area with the conductive fiber is increased, so that the disconnection of the conductive fiber at the edge can be further suppressed.

  Further, an electric wire with a crimp terminal according to the present invention includes any one of the above crimp terminals and an electric wire connected to the electric wire connection part of the crimp terminal and having a core wire made of conductive fibers.

  In the wire with the crimp terminal having such a configuration, the tensile strength of the wire at the wire connection portion of the crimp terminal is sufficiently ensured.

  Further, the medical device sensor according to the present invention includes a medical sensor main body, an output electric wire extending from the medical sensor main body, and any one of the above-described crimp terminals, and the output electric wire includes the crimp terminal. The core of the output electric wire connected to the electric wire connection part of the terminal is a conductive fiber.

  In the medical device sensor having such a configuration, the tensile strength of the wire at the wire connection portion of the crimp terminal is sufficiently ensured.

  As described above, according to the present invention, a crimp terminal capable of sufficiently securing a tensile strength when a wire whose core wire is formed of a conductive fiber is crimped to a wire connection portion, the wire with the crimp terminal, and the crimp terminal It is possible to provide a medical device sensor provided with an attached electric wire.

FIG. 1 is a perspective view of the connector terminal according to the present embodiment. FIG. 2 is a schematic view of the connector terminal as viewed from the front side in the central axis direction. FIG. 3 is a sectional view taken along the line III-III in FIG. FIG. 4 is an expanded view of the connector terminal. FIG. 5 is an enlarged view of a wire connection portion in a development view of the connector terminal. FIG. 6 is a diagram illustrating the electric wire connection portion in a state where the electric wires are connected. FIG. 7 is a diagram showing a cross section at the position VII-VII in FIG. FIG. 8 is a diagram for explaining a state in which the partner terminal pins are connected. FIG. 9 is a diagram for explaining a medical device sensor. FIG. 10 is a perspective view of the connector housing. FIG. 11 is a sectional view taken along the line XI-XI in FIG. FIG. 12 is a cross-sectional view of the connector in a state where the mating terminal pins are connected. FIG. 13 is a perspective view of a conventional connector terminal. FIG. 14 is a diagram illustrating a state where an electric wire is connected to the connector terminal. FIG. 15 is a diagram illustrating a state where an electric wire is connected to another conventional connector terminal.

  Hereinafter, an embodiment of a crimp terminal according to the present invention will be described with reference to FIGS. The crimp terminal of the present embodiment is a connector terminal. More specifically, the crimp terminal is a female connector terminal to which a male connector terminal pin (mating terminal pin) is connected (fitted). An electric wire whose core wire is made of a conductive fiber is connected to this connector terminal.

  As shown in FIGS. 1 to 4, the connector terminal 1 includes an electric wire connection portion 2 to which an electric wire can be connected. Further, the connector terminal 1 includes an electric connection portion 3 which is electrically connected to the electric wire connection portion 2 and to which a mating terminal pin P (see FIG. 8) is detachably connected. The connector terminal 1 of the present embodiment is obtained by punching a conductive metal flat plate into a predetermined shape (see FIG. 4) and bending the flat plate into a cylindrical shape with the axis parallel to the center line C1 as the center axis C. It is formed by doing. Although this connector terminal 1 is formed of phosphor bronze, it may be formed of brass, nickel silver, plated SUS, or the like. Hereinafter, in the direction of the central axis C, the electric connection portion 3 side (the left side in FIG. 3) is referred to as a front side, and the electric wire connection portion 2 side (the right side in FIG. 3) is referred to as a rear side.

  The wire connection portion 2 includes a plate-shaped wire connection portion main body 21, a plurality of conductor caulking pieces 22 extending from the wire connection portion main body 21, and at least one pair extending from a portion of the wire connection portion main body 21 behind the conductor caulking piece 22. And a cover crimping piece 23. The conductor caulking piece 22 and the cover caulking piece 23 are in the connector terminal 1 (the state shown in FIG. 4; hereinafter, referred to as a “plate-shaped connector terminal 1”) before the bending or the like is performed. , Extending from both ends in the width direction (direction orthogonal to the center line C1) of the electric wire connection portion main body 21 toward the outside in the width direction.

  The electric wire connection portion main body 21 is a portion that extends in the direction of the central axis C and has a U-shaped cross section (a cross section orthogonal to the central axis C).

  The plurality of conductor caulking pieces 22 are crimped to embrace a core wire (conductor) exposed at the end of the electric wire, and press-bond this core wire to the electric wire connection portion main body 21. As shown in FIG. 5, the plurality of conductor caulking pieces 22 are connected to the wire connecting portion 2 of the flat connector terminal 1 (hereinafter, simply referred to as “flat wire connecting portion 2”). A plurality of first caulking pieces 221 extending from one end in the width direction (left end in FIG. 5) and at least one second caulking piece 222 extending from the other end in the width direction (right end in FIG. 5). The first swaging pieces 221 and the second swaging pieces 222 extend alternately from positions shifted in the direction of the center line C1 (that is, they are alternately arranged). The electric wire connection part 2 of the present embodiment has two first caulking pieces 221 and two second caulking pieces 222.

  Of the two first caulking pieces 221, one (front side) first caulking piece 221 </ b> A is mountain-shaped. Specifically, in one of the first crimping pieces 221A, the front edge 2214A of the flat wire connection portion 2 is positioned from one end in the width direction of the wire connection portion main body 21 (the direction orthogonal to the center line C1). It extends in the width direction, and the edge 2215A on the rear side crosses the width direction from one end of the wire connection portion main body 21 in the width direction, more specifically, in the direction away from the center line C1 toward the front side. Extending. That is, in the flat wire connection portion 2, an edge 2214A between the distal end 2211A and the base end 2212A extends in the width direction on the front side of the one first caulking piece 221A, and the one first caulking piece 221A. On the rear side, an edge 2215A between a tip (tip) 2211A and a base (base end) 2213A extends in a direction intersecting the width direction.

  The other (rear side) first swaging piece 221B of the two first swaging pieces 221 is also mountain-shaped. Specifically, in the other first caulking piece 221B, in the flat wire connection portion 2, a direction in which the front edge 2214B crosses the width direction from one end of the wire connection portion main body 21 in the width direction, specifically Extends in a direction away from the center line C <b> 1 toward the rear side, and a direction in which the rear edge 2215 </ b> B crosses the width direction from one end in the width direction of the wire connection portion main body 21, specifically, the front side And extends in a direction away from the center line C1. That is, in the flat-plate-shaped electric wire connection portion 2, the edge 2214B between the front end (front end) 2211B and the base end (base end) 2212B is located on the front side of the other first caulking piece 221B in the width direction. In the other side of the other first caulking piece 221B, an edge 2215B between a tip (tip) 2211B and a base (base end) 2213B extends in a direction intersecting the width direction. ing.

  A base end 2213A on the rear side of the first caulking piece 221A and a base end 2212B on the front side of the other first caulking piece 221B coincide with each other in the direction of the center line C1.

  Of the two second caulking pieces 222, one (front side) second caulking piece 222A has a mountain shape. Specifically, in one of the second caulking pieces 222A, in the flat wire connection portion 2, a direction in which the front edge 2224A crosses the width direction from the other end of the wire connection portion main body 21 in the width direction, specifically, Extends in a direction away from the center line C <b> 1 toward the rear side, and a direction in which the rear edge 2225 </ b> A crosses the width direction from the other end in the width direction of the wire connection portion main body 21, specifically, the front side And extends in a direction away from the center line C1. That is, in the flat-plate-shaped electric wire connection portion 2, the edge 2224A between the front end (front end) 2221A and the base end (base end) 2222A is located on the front side of the one second caulking piece 222A in the width direction. An edge 2225A between a tip (tip) 2221A and a base (base end) 2223A extends in a direction intersecting the width direction behind the second caulking piece 222A. ing.

  Of the two second swaging pieces 222, the other (rearward) second swaging piece 222B is also mountain-shaped. Specifically, in the other second swaging piece 222B, the front edge 2224B of the flat wire connection portion 2 crosses the width direction from the other end of the wire connection portion main body 21 in the width direction. Extends in the direction away from the center line C <b> 1 toward the rear side, and the rear edge 2225 </ b> B extends in the width direction from the other end in the width direction of the wire connection portion main body 21. That is, in the flat-plate-shaped electric wire connection portion 2, the edge 2224B between the front end (front end) 2221B and the base end (base end) 2222B is located on the front side of the other second caulking piece 222B in the width direction. An edge 2225B between the tip 2221B and the base 2223B extends in the width direction on the rear side of the other second swaging piece 222B.

  A rear base 2223A of one second caulking piece 222A and a front base 2222B of the other second caulking piece 222B coincide with each other in the center line C1 direction.

  In each of the caulking pieces 221A, 221B, 222A, and 222B of the flat-shaped electric wire connecting part 2, the height dimension (the dimension in the width direction) of the other second caulking piece 222B from the electric wire connecting part main body 21 is other caulking. It is smaller than the height of the pieces 221A, 221B, 222A. The height dimensions of the other swaging pieces 221A, 221B, 222A are the same.

  Further, in the flat wire connecting portion 2, a boundary between the two first caulking pieces 221A and 221B (a base end 2213A of one first caulking piece 221A and a base end 2212B of the other first caulking piece 221B coincide with each other). Is located at the same position in the direction of the center line C1. On the other hand, the tip 2211B of the other first swaging piece 221B and the boundary between the two second swaging pieces 222A, 222B (the base end 2223A of the one second swaging piece 222A and the base end 2222B of the other second swaging piece 222B, Are coincident with each other) in the direction of the center line C1. Specifically, the tip 2211B of the first swaging piece 221B is shifted forward from the boundary between the two second swaging pieces 222A and 222B.

  When the caulking pieces 221A, 221B, 222A, 222B configured as described above are swaged so as to embrace the core wire 90 of the electric wire 9 as shown in FIG. The space between the first caulking piece 221B and the second caulking piece 222B formed at a position close to the insulating coating member 91 of the electric wire 9, more specifically, the space (first space α) in the direction of the central axis C is another position. (The distance in the direction of the central axis C: the second distance β) between the first swaging pieces 221A and 221B and the second swaging piece 222A. In the connector terminal 1 of the present embodiment, the interval (first interval α) between the other first swaging piece 221B and the other second swaging piece 222B is equal to the other first swaging piece 221B and the one second swaging piece 222A. (Second interval β), and the interval (second interval β) between one first caulking piece 221A and one second caulking piece 222A.

  Note that the first interval α is a distance at which the first swaging piece 221B and the second swaging piece 222B whose edges are swollen due to caulking do not contact. The details are as follows.

  When the caulking pieces 221A, 221B, 222A, and 222B are caulked, the edges of the caulking pieces 221A, 221B, 222A, and 222B are in an initial state (a state before caulking: FIG. 7 (see the broken line in the partially enlarged view). Further, depending on the state of the core wire 90 and the electric wire 9 at the time of caulking, each of the caulking pieces 221A, 221B, 222A, and 222B may slightly deviate from the position expected after caulking in the direction of the central axis C or the like. The first interval α is set such that the other first swaging piece 221B and the other second swaging piece 222B do not come into contact with each other even if the swelling or displacement occurs. As described above, the other first caulking piece 221B and the other second caulking piece 222B have such a shape that the first interval α occurs when swaged. In the present embodiment, the first interval α increases toward the rear side (see FIG. 6).

  Returning to FIGS. 1 to 6, at least one pair of the caulking pieces 23 of the covering portion is a portion which is caulked so as to sandwich the portion of the electric wire 9 covered with the insulation near the exposed core wire 90 between the electric wire connecting portion main body 21. is there. The electric wire connecting portion 2 of the present embodiment has a pair of covering portion caulking pieces 23. Each of the pair of covering portion caulking pieces 23 extends outward from the position adjacent to the rear side of the conductor caulking piece 22 in the direction of the center line C1 in the flat wire connection portion 2 toward the outside in the width direction. The covering portion caulking piece 23 on one side in the width direction and the covering portion caulking piece 23 on the other side extend from the same position in the direction of the center line C1.

  In the flat connector terminal 1 on which the wire connecting portion main body 21, the conductor caulking piece 22, and the covering portion caulking piece 23 are formed, the wire connecting portion main body 21 is bent so as to be curved. 2 are formed (see FIG. 1).

  The electric connection portion 3 includes an electric connection portion main body 31 connected to the electric wire connection portion main body 21 and three or more (three in the present embodiment) elastic contact pieces 32 arranged at intervals around the central axis C. And The electrical connection portion 3 is electrically connected to the mating terminal pin P (see FIG. 8) by inserting the mating terminal pin into a region A (see FIG. 2) surrounded by three or more elastic contact pieces 32. Connected (mated) as possible.

  The electric connection portion main body 31 has a cylindrical portion 311 surrounding the central axis C, and a regulating piece 312 extending from the rear end of the cylindrical portion 311 toward the central axis C. Further, the electric connection portion main body 31 has a terminal side engaging portion 313 extending outward from the cylindrical portion 311 and capable of engaging with the connector housing when the connector terminal 1 is accommodated in the connector housing.

  The cylindrical portion 311 is a portion where the distal end of the mating terminal pin P is located inside (the region surrounded by the cylindrical portion 311) when the mating terminal pin P and the connector terminal 1 are fitted (FIG. 8). The tubular portion 311 is a rectangular plate-like portion that is long in a direction orthogonal to the center line C1 in the flat connector terminal 1, and this portion faces the center axis C and its longitudinal ends face each other. It is formed by curving the whole so as to make it cylindrical.

  The restricting piece 312 prevents the distal end of the mating terminal pin P from moving further back (to the rear of the connector terminal 1) when the mating terminal pin P and the connector terminal 1 are fitted together. That is, when the counterpart terminal pin P moving along the central axis C enters the inside of the cylindrical portion 311, the tip of the counterpart terminal pin P contacts the control piece 312. , To prevent the tip from moving further.

  The restricting piece 312 bends a portion 312 extending in the direction of the center line C1 from the rear edge of the flat tubular portion 311 shown in FIG. 4 toward the central axis C in a state where the tubular portion 311 is tubular. It is formed by. In the electric connection portion 3 of the present embodiment, a plurality of restriction pieces 312 are arranged at intervals in the circumferential direction of the cylindrical portion 311.

  The terminal-side engaging portion 313 is a portion that engages with the connector housing 5 when the connector terminal 1 is housed in the connector housing 5 (see FIG. 10). The terminal side engaging portion 313 protrudes from the cylindrical portion 311 and is inclined with respect to the central axis C so as to move away from the central axis C toward the rear side.

  Each of the three elastic contact pieces 32 extends along the central axis C, and the mating terminal pin P is inserted along the central axis C into a region A surrounded by the three elastic contact pieces 32. It is pressed by the mating terminal pin P, thereby being elastically deformed. The three elastic contact pieces 32 are arranged at intervals on a circumference centered on the central axis C. The specific configuration of each elastic contact piece 32 is as follows.

  Each elastic contact piece 32 is an elastically deformable plate-like portion extending forward from the electric connection portion main body 31, and has a main surface (a surface orthogonal to the thickness direction) 32 </ b> A with its center facing the central axis C. They are arranged at equal intervals around the axis C. The elastic contact piece 32 has two bent portions (first bent portion 321 and second bent portion 322) spaced from each other in the central axis C direction. Hereinafter, a portion of the elastic contact piece 32 behind the first bent portion 321 is referred to as a base portion 323, a portion between the first bent portion 321 and the second bent portion 322 is referred to as a contact portion 324, and a second bent portion is provided. A portion on the front side of the portion 322 is referred to as a tip portion 325.

  The base portion 323 is inclined with respect to the central axis C so as to move away from the central axis C toward the rear side from the contact portion 324 (see FIG. 3).

  The contact portion 324 makes contact with the mating terminal pin P when the mating terminal pin P is inserted into the area A surrounded by the three elastic contact pieces 32 along the central axis C. (Conduction) (see FIG. 8). This contact portion 324 is bent. Specifically, the contact portion 324 extends along the central axis C and curves so as to expand toward the central axis C. Due to this curvature, an inscribed circle γ (see FIG. 2) centered on the central axis C and in contact with the part of each contact portion 324 that is closest to the central axis C (see FIG. 2) is smaller than the outer circumference of the mating terminal pin P. I have. Therefore, when the mating terminal pin P is inserted into the region A surrounded by the elastic contact piece 32, each contact portion 324 is pushed and spread in a direction away from the central axis C.

  The distal end 325 extends from the distal end (the end opposite to the base 323) of the contact portion 324, and is located outside the contact portion 324 in a direction orthogonal to the central axis C. Specifically, the distal end portion 325 is inclined with respect to the central axis C so as to move away from the central axis C as it goes forward from the contact portion 324 (see FIG. 3).

  For example, as shown in FIG. 6, the connector terminal 1 configured as described above is used by being connected to the distal end of the electric wire 9 having the core wire 90 formed of a conductive fiber such as carbon fiber. Specifically, connection of the connector terminal 1 to the electric wire 9 is performed as follows. In the electric wire 9 of the present embodiment, the core wire 90 is formed by bundling carbon fibers having a diameter of several μm.

  The electric wire 9 is connected to the electric wire connection part 2 of the connector terminal 1. Specifically, the end of the electric wire 9 with the core wire 90 exposed is arranged on the electric wire connection portion main body 21 of the electric wire connection portion 2. Subsequently, the conductor caulking pieces 22 (the first caulking piece 221 and the second caulking piece 222) are caulked so as to embrace the core wire 90, and the core wire 90 is crimped to the wire connection part main body 21. At this time, caulking is performed so that the rear end (lower side in FIG. 6) of the other second swaging piece 222B is not pressed by the crimping jig, and the portion is not completely laid on the core wire 90 side. (I'm up a little). In addition, the covering portion caulking piece 33 is swaged, and the portion of the electric wire 9 that is covered with insulation is sandwiched between the electric wire 9 and the electric wire connecting portion main body 21. Thus, the connector terminal 1 is connected to the electric wire.

  The core wire 90 of the electric wire 9 connected to the connector terminal 1 is not limited to carbon fiber. The core wire 90 is made of a resin fiber having a metal filler, a plated fiber obtained by plating a metal such as polyester fiber or carbon fiber, polypyrrole, polythiophene, polyacetylene, polyphenylene, polyphenylene vinylene, polyaniline, polyacene, polythiophene. Conductive fibers such as vinylenes and fibers composed of a copolymer of two or more thereof may be used. That is, according to the connector terminal 1 of the present embodiment, even when the core wire 90 is formed by bundling very thin conductive fibers without generating internal stress when caulking such as carbon fiber, the wire connection portion 2 Although sufficient tensile strength of the electric wire 9 can be ensured, sufficient tensile strength at the electric wire connection portion 2 can be ensured even if the core wire 90 is made of another conductive fiber. The connector terminal 1 can also be connected to an electric wire having a metal core wire.

  Further, the connector terminal 1 may be used for, for example, a medical sensor or the like. The medical sensor of the present embodiment is, for example, an electrocardiogram electrode 10 as shown in FIG. The electrocardiogram electrode 10 includes an electrode body 11 to be attached to the skin such as the chest, an output wire 12 extending from the electrode body 11, and a connector terminal 1 connected to a tip of the output wire 12. The connector terminal 1 may be used, for example, in a state housed in a connector housing 5 shown in FIG.

  According to the connector terminal 1 described above, as shown in FIG. 6, each of the conductor caulking pieces 22 (the first caulking piece 221 and the second caulking piece 222) is caulked, so that the core wire 90 is formed of conductive fibers. When the electric wire 9 is connected to the connector terminal 1 (the electric wire connection portion 2), the first caulking piece 221B and the second caulking piece formed at positions closest to the insulating coating member 91 of the electric wire 9 in the direction of the central axis C. 222B (the first interval α) increases. For this reason, the disconnection of the conductive fiber at the position is suppressed, and thereby a sufficient tensile strength can be secured. The details are as follows.

  When the conductor caulking pieces 22 are caulked to connect the electric wire 9 to the connector terminal 1, if the distance between the first caulking piece 221 and the second caulking piece 222 is small, the first caulking piece 221 and the second caulking piece at the time of caulking are used. Breakage of the conductive fiber (at the boundary position) between the first crimping piece 221 and the second crimping piece 222 is likely to occur due to biting between the two crimping pieces 222 or the like. Further, when caulking, by preventing disconnection of the conductive fiber between the other first caulking piece 221B and the other second caulking piece 222B, the first caulking pieces 221A and 221B at other positions are prevented from breaking. Sufficient tensile strength is ensured even if the conductive fiber is broken between the two-crimp piece 222A. For this reason, by making the first interval α wider than the second interval β (specifically, at an interval that does not cause disconnection due to the biting or the like) and suppressing disconnection at this position, sufficient pulling is achieved. Strength can be secured.

  Note that even if a break occurs at the position where the second interval β is formed, the first caulking pieces 211A and 211B and the second caulking piece 222A are firmly caulked and the core wire 90 is firmly embraced. (The core wire 90) and the connector terminal 1 are sufficiently conducted.

  In the connector terminal 1 of the present embodiment, the first interval (the interval between the other first caulking piece 221B and the other second caulking piece 222B) α is in a state where the electric wire 9 is connected (that is, each caulking piece). 221A, 221B, 222A, and 222B are caulked) in the state where the other first caulking piece 221B and the other second caulking piece 222B whose edges are swollen due to caulking do not contact. For this reason, the disconnection of the conductive fiber between the first caulking piece 221B and the second caulking piece 222B (boundary position) formed at the position closest to the insulating coating member 91 of the electric wire 9 in the direction of the central axis C is more likely. As a result, sufficient tensile strength can be ensured more reliably.

  In the connector terminal 1 of the present embodiment, for example, the edge between the tip 2211B and the base end 2212B of the first swaging piece 221B and the edge between the tip 2221A and the base end 2222B of the second swaging piece 222A, for example. Each of the portions extends in a direction crossing the width direction of the electric wire connection portion main body 21.

  According to such a configuration, in a state where the caulking pieces 221B and 222A are caulked, the edge of each caulking piece 221B and 222A is inclined with respect to each conductive fiber (conductive fiber constituting the core wire 90). Touch across. Thereby, the contact area with the conductive fiber is increased as compared with the case where the conductive fiber is in contact with the conductive fiber at right angles (in the width direction of the wire connection portion main body 21), and as a result, the conductive fiber is disconnected at the edge. Is more suppressed.

  Further, in the electric wire 9 to which the connector terminal 1 is connected (an electric wire with a connector terminal), even if the electric wire 9 in which the core wire 90 is made of a conductive fiber is crimped to the electric wire connection portion 2, the electric wire of the connector terminal 1 can be used. The tensile strength of the electric wire 9 at the connection portion 2 is sufficiently ensured.

  That is, when the connector terminal 1 is used for the medical device sensor 10, even if an electric wire whose core wire is made of a conductive fiber is used as an output wire in the medical device sensor 10, the electric wire connection of the connector terminal 1 is performed. The tensile strength of the electric wire 9 in the part 2 is sufficiently ensured.

  It should be noted that the crimp terminal, the wire with the crimp terminal, and the sensor for a medical device of the present invention are not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention. is there. For example, the configuration of another embodiment can be added to the configuration of one embodiment, and a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. Further, a part of the configuration of an embodiment can be deleted.

  In the connector terminal 1 of the above embodiment, the conductor caulking piece 22 is constituted by the two first caulking pieces 221 and the two second caulking pieces 222, but is not limited to this configuration. The conductor caulking piece 22 may be configured by two or more first caulking pieces 221 and at least one second caulking piece 222. The first swaging pieces 221 and the second swaging pieces 222 are alternately arranged so as to be shifted in the direction of the central axis C.

  The specific configuration of the electrical connection portion 3 of the crimp terminal is not limited. The electrical connection portion 3 of the crimp terminal (connector terminal) 1 of the above embodiment holds the mating terminal pin P by three or more elastic contact pieces 32, but is not limited to this configuration. The electrical connection unit 3 may be configured to be connected to the counterpart terminal by a fastening member, soldering, or the like.

  The connector terminal 1 may be housed in a connector housing to form a connector. The configuration of this connector is, for example, as follows.

  As shown in FIGS. 10 to 12, the connector housing 5 has a terminal accommodating portion 6 for accommodating the connector terminal 1 and a terminal insertion opening 7 into which the mating terminal pin P is inserted. The connector housing 5 has a proximal end opening 8 into which the connector terminal 1 is inserted. The details are as follows. In the following, in the direction of the central axis C, the side of the terminal insertion port 7 is referred to as a front side, and the side of the proximal end opening 8 is referred to as a rear side.

  The connector housing 5 has a cylindrical shape having a central axis C, and is formed of an insulating resin. The connector housing 5 has an inner peripheral surface 50, and the inner peripheral surface 50 defines a space (accommodation space) S in which the connector terminal 1 is accommodated. The terminal housing portion 6 of the present embodiment includes the inner peripheral surface 50 and the housing space S. The terminal insertion opening 7 is an opening at the front end of the connector housing 5 for communicating the housing space S with the outside in the direction of the center axis C. The base end opening 8 is formed at the rear end of the connector housing 5 at the center axis C It is an opening for communicating the outside and the accommodation space S in the direction.

  In the inner peripheral surface 50 of the present embodiment, a cross section at each position in the direction of the central axis C (a cross section in a plane direction orthogonal to the central axis C) is circular or substantially circular. The inner peripheral surface 50 has a plurality of portions having different diameters. Specifically, in order from the front side to the rear side, the first portion 51 having the smallest diameter, the second portion 52 having a larger diameter than the first portion 51, and the second portion 52 having the larger diameter (the largest diameter A third portion 53). The first portion 51 and the second portion 52 are connected by a first reduced diameter portion 54 whose diameter decreases toward the front side. Further, the second portion 52 and the third portion 53 are connected by a second reduced diameter portion 55 whose diameter is reduced toward the distal end side. The central axes of the respective portions 51 to 55 constituting the inner peripheral surface 50 coincide with each other.

  The first portion 51, the first reduced diameter portion 54, and the second portion 52 are portions that surround the periphery of the electrical connection portion 3 on the inner peripheral surface 50. The second portion 52 includes a housing-side engaging portion 521 that engages with the terminal-side engaging portion 313 at a position corresponding to the terminal-side engaging portion 313 of the electric connecting portion 3 (specifically, the electric connecting portion main body 31). Have. The housing-side engaging portion 521 of the present embodiment is a small-diameter portion (a portion protruding toward the central axis C) partially provided in the central axis C direction, and a second reduced-diameter portion in the central axis C direction. 55 is provided at a position adjacent (continuous) to 55. Further, a boundary portion 56 between the first portion 51 and the first reduced diameter portion 54 comes into contact with the base 323 of the elastic contact piece 32 and the outside of the base 323 (specifically, the outside of the inner peripheral surface 50 in the radial direction). . That is, the boundary 56 supports the base 323 from outside.

  The proximal end of the third portion 53 defines a proximal opening 8 formed in the proximal end of the connector housing 5. The accommodation space S of the connector housing 5 and the external space communicate with each other through the proximal opening 8.

  Further, the connector housing 5 has a protruding portion 70 protruding toward the central axis C from a predetermined position in the direction of the central axis C in the first portion 51. The projecting portion 70 of the present embodiment is a wall portion (tip wall portion) that defines the terminal insertion port 7 at the tip of the connector housing 5. That is, the protruding portion 70 protrudes in the direction of the central axis C from the end edge on the front end side of the first portion 51. When the mating terminal pin P is inserted from the terminal insertion port 7 with the connector terminal 1 housed in the connector housing 5, the contact portion 324 pressed by the mating terminal pin P is bent. The tip portion 325 is provided at a position where the distal end portion 325 comes into contact when it is elastically deformed into a linear shape (when it is straightened) from the state in which it has been made. The details are as follows.

  In a state before the mating terminal pin P is inserted (initial state), the contact portion 324 of each elastic contact piece 32 is curved so as to expand toward the central axis C. In this state, when the mating terminal pin P is inserted from the terminal insertion opening 7 in the direction of the central axis C, the inscribed circle γ (see FIG. 2) is smaller than the outer circumference of the mating terminal pin P. As P advances toward the rear side, the contact portion 324 of each elastic contact piece 32 is pushed outward in the radial direction of the inner peripheral surface 50. That is, a pressing force from the mating terminal pin P toward the radially outside of the inner peripheral surface 50 is applied to the contact portion 324 of each elastic contact piece 32.

  At this time, the rear end of the contact portion 324 is connected to the base portion 323 extending from the electric connection portion main body 31 engaged with the connector housing 5 and supported by the boundary portion 56 from the radial outside of the inner peripheral surface 50. Because of this, movement is regulated. Therefore, when the pressing force is applied to the contact portion 324, the tip of the contact portion 324 moves to the terminal insertion port 7 side, whereby the contact portion 324 is elastically deformed, the curvature is reduced, and the mating terminal pin P Is sufficiently inserted, the contact portion 324 becomes linear along the mating terminal pin P.

  When the contact portion 324 is extended by elastic deformation, the movement of the distal end portion 325 to the radial outside of the inner peripheral surface 50 is restricted by the first portion 51, but the movement along the first portion 51 is possible. Therefore, it moves to the distal end side (terminal insertion port 7 side) in a state of being in contact with the first portion 51. That is, the distal end portion 325 slides toward the terminal insertion opening 7 with respect to the first portion 51 (moves while sliding). When the contact portion 324 is straightened along the mating terminal pin P by elastic deformation (see FIG. 12), the tip portion sliding toward the terminal insertion port 7 with respect to the first portion 51. 325 contacts the protruding portion 70. In the state where the contact portion 324 is straightened due to the elastic deformation, the entire area of the contact portion 324 in the direction of the central axis C is in contact with the counterpart terminal pin P.

  Accordingly, in the connector (connector housing 5 in which connector terminal 1 is housed), the holding force of each elastic contact piece 32 due to the elastic return force (the pressing force toward the mating terminal pin P) and the contact portion 324 are centered. The frictional force caused by contact with the counterpart terminal pin P in the entire area in the direction of the axis C (the insertion direction) (the force resisting the removal of the counterpart terminal pin P when the counterpart terminal pin P is about to come off) is used. Is sufficiently secured. Moreover, the elastic return force (the pressing force of the elastic contact piece 32 toward the partner terminal pin P) can be reduced as compared with the case where the force for holding the partner terminal pin P is secured only by the elastic return force. It becomes easy to insert the side terminal pins P.

  That is, when the force for holding the mating terminal pin is secured only by the elastic restoring force of the elastic contact piece, it is difficult to insert the mating terminal pin, but the frictional force is used in addition to the elastic restoring force as in the connector. By securing the force for holding the mating terminal pin P in this way, both easy insertion of the mating terminal pin P and securing of sufficient holding force for the mating terminal pin P after insertion can be realized.

  The medical device sensor of the above embodiment is an electrode for an electrocardiogram, but is not limited to this configuration. The medical device sensor may be, for example, a blood pressure sensor, a SpO2 (arterial blood oxygen saturation) sensor, an expiration sensor, or the like.

  In addition, the connector terminal 1 is not limited to a sensor for a medical device, but can be used for various devices and can be connected to an electric wire having a core wire made of conductive fibers.

  DESCRIPTION OF SYMBOLS 1 ... Connector terminal, 2 ... Electric wire connection part, 21 ... Electric wire connection part main body, 22 ... Conductor caulking piece, 221, 221A, 221B ... First caulking piece, 2211A, 2211B ... Tip of the first caulking piece, 2212A, 2212B, 2213A, 2213B: Base end of first caulking piece, 2214A, 2214B, 2215A, 2215B: Edge of first caulking piece, 222, 222A, 222B: Second caulking piece, 2221A, 2221B: Tip of second caulking piece, 2222A, 2222B, 2223A, 2223B ... base end of the second caulking piece, 2224A, 2224B, 2225A, 2225B ... edge of the second caulking piece, 23 ... caulking piece, 3 ... electric connection part, 31 ... electric connection part Main body, 311 ... cylindrical part, 312 ... regulating piece, 313 ... terminal side engaging part, 32 ... elastic contact piece, 321 ... first bending , 322: second bent portion, 323: base portion, 324: contact portion, 325: distal end portion, 33: covering portion caulking piece, 4: electric connection portion, 5: connector housing, 50: inner peripheral surface, 51: first Part, 52: Second part, 521: Housing side engaging part, 53: Third part, 54: First reduced diameter part, 55: Second reduced diameter part, 56: Boundary part, 6: Terminal accommodation part, 7 ... Terminal insertion port, 70 ... Protrusion, 8 ... Base end side opening, 9 ... Electric wire, 90 ... Core wire, 91 ... Insulating coating member, 10 ... Electrocardiogram electrode (medical device sensor), 11 ... Electrode body, 12 ... Output electric wire, 100 crimp terminal, 101 terminal connection part, 102 wire connection part, 1021 bottom plate, 1022 one side caulking piece, 1023 other side caulking piece, 1022A, 1023A ... caulking piece, 105 ... caulking piece A, the area surrounded by the elastic contact pieces, C Central axis, C1 ... center line, P ... mating terminal pins, S ... accommodation space, alpha ... first interval, beta ... second intervals, gamma ... inscribed circle

Claims (4)

The wire core wire is covered with an insulating member comprising a wire connecting portion connectable,
The electric wire connection portion,
A base portion extending in the same direction as a connection portion of the electric wire with the electric wire connection portion;
A plurality of first caulking pieces extending from one end of the base in a second direction orthogonal to the first direction in which the base extends, and at least one second caulking piece extending from the other end in the second direction. ,
The plurality of first caulking pieces and the second caulking pieces are alternately arranged at positions displaced in the first direction, and each is caulked to embrace the core wire so as to crimp the core wire to the base. Yes,
An edge portion between the distal end portion and the proximal end portion of the first caulking piece, and an edge portion between the distal end portion and the basal end portion of the second caulking piece each have a direction intersecting the second direction. Extends to
The first caulking piece and the second caulking piece are caulked respectively and at a position overlapping the center line of the base when the core is connected and the base is viewed from the core side, in the first direction. the first interval is the first direction between the edge of the edge of the first crimping piece and the second crimping piece is formed at a position closest to the cover member of the wire, in addition to the position of said first direction second, larger spacing edge of the first crimping piece is formed with a first direction between the edge of the second crimping piece, solderless terminal. In the state where the first caulking piece and the second caulking piece are caulked and the core wire is connected, the edge of the first caulking piece and the edge of the second caulking piece are caused by the caulking, respectively. was seen Rise et al in and, wherein the first crimping pieces constituting the first interval and the second crimping piece does not contact, crimp terminal according to claim 1. A crimp terminal according to claim 1 or 2 ,
An electric wire connected to the electric wire connection part of the crimp terminal and having a core wire made of conductive fibers. A medical sensor body,
An output wire extending from the medical sensor body,
And the crimp terminal according to claim 1 or 2 ,
The output wire is connected to the wire connection portion of the crimp terminal,
A sensor for medical equipment, wherein a core wire of the output electric wire is a conductive fiber.