JP2022146959A - Terminal fitting and electric wire with terminal - Google Patents

Abstract

To improve an electric connection stability with a core wire.SOLUTION: A terminal fitting comprises: a terminal fitting main body 30; and a conductive lid member 40 that is assembled to the terminal fitting main body and is held in an assembling state. The terminal fitting main body includes a core wire connection body 32 physically and electrically connected to the core wire of an electric wire 10 of which the core wire 11 formed by a plurality of element wires 11a is covered with a coating 12. The core wire connection body includes: a bottom part 32a; and a pair of cantilever side wall parts 32b and 32b which are stood from the bottom part, and are oppositely arranged with an interval from each other, and includes at least one pair of a pair of pressure-weldings 34 and 34 which is oppositely arranged with the interval from each other between them, and makes the coating 12 of the electric wire inserted from an opening 32c between free-ends 32b1 and 32b1 in the pair of side wall parts contact, with a pressure, each element wire of the outermost layer of the core wire by being broken and opened. The lid member provides at least one piercing body 42 between the element wires of the core wire in an inner side from each element wire of the outermost layer by broking and opening the coating of the electric wire.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a terminal fitting and an electric wire with a terminal.

Conventionally, as a terminal fitting, a so-called piercing terminal for physically and electrically connecting an electric wire in which a core wire composed of a plurality of wires is covered with a coating is known. In the piercing terminal, the core wire connection body is provided with a piercing portion for piercing through the coating of the electric wire and piercing between the strands of the core wire. Terminal fittings of this type are disclosed, for example, in Patent Documents 1 to 7 below.

JP-A-2002-270253 JP-A-2003-243060 Japanese Patent Application Laid-Open No. 2003-249280 JP-A-2003-257511 Japanese Patent Application Laid-Open No. 2003-264012 JP 2003-317819 A JP-A-2004-253198

By the way, in this terminal fitting, it is desirable to bring the piercing portion into contact with as many strands as possible in order to improve the electrical connection stability with the core wire. However, in this terminal fitting, the piercing portion protrudes in the direction opposite to the assembling direction of the electric wire, and the piercing portion is pierced into the core wire in the flexible sheath of the electric wire at the same time as the electric wire is assembled. However, it is not always possible to bring the piercing portion into contact with the wire intended for design. For this reason, conventional terminal fittings have room for improvement in improving the electrical connection stability with core wires.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a terminal fitting and an electric wire with a terminal that can improve the stability of electrical connection with a core wire.

In order to achieve the above object, a terminal fitting according to the present invention comprises a terminal fitting body and a conductive lid member assembled to the terminal fitting body and held in the assembled state, wherein the terminal fitting body comprises: It has a core wire connecting body for physically and electrically connecting a core wire composed of a plurality of strands to the core wire of the electric wire covered with a coating, and the core wire connecting body has a bottom and a bottom and a standing erect from the bottom. and a pair of cantilevered side wall portions arranged to face each other with a space therebetween, and the pair of side wall portions are arranged to face each other with a space between the pair of side wall portions. at least one pair of pressure contact bodies for cutting the coating of the electric wire inserted from the opening between the free ends of the wire and making pressure contact with the outermost strand of the core wire, and the lid member includes: At least one piercing body is provided to pierce the coating of the electric wire and pierce between the strands of the core wire inside the strands of the outermost layer.

Further, in order to achieve the above object, an electric wire with a terminal according to the present invention includes an electric wire in which a core wire composed of a plurality of strands is covered with a coating, and a terminal fitting to be assembled with the electric wire, wherein the terminal fitting comprises a terminal fitting body and a conductive lid member assembled to the terminal fitting body and held in the assembled state, wherein the terminal fitting body is physically and electrically connected to the core wire. A core wire connector is provided, and the core wire connector has a bottom and a pair of cantilever side walls erected from the bottom and arranged to face each other with a space therebetween, and the pair of The outermost layer of the core wire is formed by cutting the covering of the electric wire inserted through the opening between the free ends of the pair of side wall portions, and the outermost layer of the core wire. At least one pair of press-contact bodies to be press-contacted to the wire is provided, and the cover member has a piercing body that pierces the wire covering of the wire and pierces between the wires of the core wire inside the wires of the outermost layer. is characterized by providing at least one.

In the terminal fitting according to the present invention, each pair of press-contact bodies contacts the strands of the outermost layer of the core wire, and the piercing body contacts the strands inside the outermost layer. Therefore, compared with conventional terminal fittings, this terminal fitting comes into contact with many strands regardless of the inner and outer layers of the core wire, and the contact area with the core wire can be increased. An increase in electrical resistance can be suppressed. Furthermore, in this terminal fitting, even if a force directed toward the opening is applied to the wire, the movement of the wire due to the force can be restricted by the lid member. The contact state between the core wire and the contact state between the piercing body and the core wire inner than the outermost layer can be maintained. Therefore, this terminal fitting can maintain its state while suppressing an increase in electrical resistance between the terminal fitting and the core wire.

Further, in electric wires, when the strands are made of aluminum or an aluminum alloy, an oxide film is formed on the surface of the strands. However, the pair of pressure contact bodies scrape off the oxide film of the outermost layer of the wires in the core wire while the wire is being pushed. Therefore, in the terminal fitting main body, the pair of pressure contact bodies can be brought into contact with the outermost layer of the core wire without an oxide film interposed therebetween. Furthermore, while the piercing body is piercing between the wires of the core wire, the piercing body scrapes off the surface oxide film while rubbing the surface of the wire. Therefore, the lid member can bring the piercing body into contact with the strands inside the strands of the outermost layer of the core wire without an oxide film interposed therebetween. Therefore, this terminal fitting can suppress an increase in electrical resistance with the core wire even when the element wire is formed of aluminum or an aluminum alloy.

As described above, the terminal fitting according to the present invention can suppress an increase in electrical resistance between the terminal fitting and the core wire, so that the electrical connection stability with the core wire can be improved. And since the electric wire with a terminal which concerns on this invention is equipped with this terminal metal fitting, it can acquire the same effect as what this terminal metal fitting plays|plays.

FIG. 1 is a perspective view showing a terminal fitting and an electric wire with a terminal according to an embodiment. FIG. 2 is a plan view of the terminal fitting and the electric wire with the terminal of the embodiment, viewed from the lid member side. FIG. 3 is a schematic diagram of a cross section taken along line XX of FIG. FIG. 4 is an exploded perspective view of a terminal fitting and an electric wire with a terminal according to the embodiment. FIG. 5 is an exploded perspective view of the terminal fitting and the electric wire with the terminal of the embodiment, viewed from another angle. FIG. 6 is an exploded perspective view showing the terminal-equipped electric wire before the lid member is assembled. FIG. 7 is a schematic diagram of a cross section corresponding to the XX line cross section of FIG. 2 in FIG. FIG. 8 is a perspective view showing a terminal fitting and an electric wire with a terminal in a modified form. FIG. 9 is an exploded perspective view showing the terminal-equipped electric wire before the piercing body is attached. FIG. 10 is a schematic diagram of a cross section taken along the line XX of FIG.

EMBODIMENT OF THE INVENTION Below, embodiment of the terminal metal fitting which concerns on this invention, and an electric wire with a terminal is described in detail based on drawing. In addition, this invention is not limited by this embodiment.

[Embodiment]
One embodiment of a terminal fitting and an electric wire with a terminal according to the present invention will be described with reference to FIGS. 1 to 10. FIG.

Reference numeral 1 in FIGS. 1 to 7 indicates an electric wire with a terminal according to this embodiment. This electric wire with terminal 1 includes an electric wire 10 and a terminal fitting 20 attached to the electric wire 10, which are physically and electrically connected.

The electric wire 1 with a terminal may have a terminal fitting 20 connected to the end of the electric wire 10 or may have a terminal fitting 20 connected to a portion between both ends of the electric wire 10 . Moreover, this electric wire 1 with a terminal may be one in which at least one terminal metal fitting 20 is connected to one electric wire 10, and a plurality of electric wires 10 are connected by at least one terminal metal fitting 20, and the terminal A plurality of electric wires 10 may be electrically connected via metal fittings 20 . For example, the terminal fitting 20 can be physically and electrically connected to the mating terminal fitting by fitting connection to the mating terminal fitting, or can be fixed to the mating terminal fitting by screwing. When formed to be physically and electrically connected to the electrical connection, it is connected to the end of at least one wire 10 . Further, for example, when the terminal fitting 20 is formed as a joint terminal for electrically connecting a plurality of electric wires 10 , it is connected to the end of the electric wire 10 or a portion between both ends of the electric wire 10 . The terminal fitting 20 in this case may be a joint terminal that physically and electrically connects the plurality of wires 10 and electrically connects all the wires 10 through itself. is a joint terminal for physically and electrically connecting at least two of them into one combination, and may be provided for each combination. In the electric wire 1 with terminal shown here, one terminal fitting 20 to be fit-connected to the mating terminal fitting is connected to the end of one electric wire 10 .

The electric wire 10 includes a core wire 11 composed of a plurality of strands 11a and a coating 12 covering the core wire 11 (FIGS. 3 to 5 and 7). The electric wire 10 shown here includes a core wire 11 in which a plurality of strands 11a made of a conductive metal wire are bundled in a cylindrical shape, a cylindrical coating 12 that concentrically covers the core wire 11 from the outer surface side, It has The wire 11a is made of, for example, aluminum, an aluminum alloy, copper, or a copper alloy.

The core wire 11 may be formed by bundling a plurality of strands 11a with their axial directions aligned with each other in a columnar shape, or a twisted wire obtained by twisting the plurality of strands 11a bundled in a columnar shape. may be Furthermore, the core wire 11 as the stranded wire may be obtained by twisting together all the strands 11a bundled in a cylindrical shape. A plurality of remaining strands 11a may be wound around the wire 11a, and a plurality of strand groups are formed by twisting the plurality of strands 11a, and the plurality of strand groups are formed. It may be bundled into a cylindrical shape and twisted together. Even if the core wire 11 adopts any form such as these, a plurality of strands 11a are arranged in the outermost layer, and a plurality of strands 11a are arranged inside the plurality of strands 11a in the outermost layer. of wires 11a are arranged.

The terminal fitting 20 includes a terminal fitting main body 30 and a conductive lid member 40 that is attached to the terminal fitting main body 30 and held in the assembled state (FIGS. 1 to 7). The terminal fitting main body 30 and the cover member 40 are each formed of a conductive material such as metal. The terminal fitting main body 30 and the lid member 40 shown here are each formed by press molding using a metal plate as a base material.

The terminal fitting main body 30 includes a terminal connector 31 physically and electrically connected to a terminal connector (not shown) of the mating terminal fitting, and a core wire 11 at the end of the electric wire 10 physically and electrically. It has a core wire connector 32 to be connected and a covering connector 33 physically connected to the covering 12 of the end of the electric wire 10 (FIGS. 1, 2 and 4 to 6).

For example, the terminal connection body 31 of the terminal metal fitting main body 30 and the terminal connection body of the mating terminal metal fitting are formed such that one of them is shaped like a female terminal and the other is shaped like a male terminal and inserted into each other. be mated. In this example, the terminal connection body 31 of the terminal metal fitting main body 30 is formed in the shape of a female terminal, and the terminal connection body of the mating terminal metal fitting is formed in the shape of a male terminal.

The core wire connector 32 has a bottom portion 32a and a pair of cantilevered side wall portions 32b, 32b erected from the bottom portion 32a and opposed to each other with a space therebetween (see FIGS. 1 and 3). Figure 7). The terminal of the electric wire 10 is housed in a space surrounded by the bottom portion 32a and the pair of side wall portions 32b, 32b. In the core wire connector 32 shown here, a pair of rectangular side wall portions 32b, 32b are vertically provided from both ends of a rectangular bottom portion 32a. In this core wire connector 32, an opening 32c between the free ends 32b ₁ and 32b ₁ of the pair of side wall portions 32b and 32b is provided in the space surrounded by the bottom portion 32a and the pair of side wall portions 32b and 32b. The end of the electric wire 10 is inserted through (FIGS. 3, 4, 6 and 7).

Further, the core wire connecting body 32 is arranged to face each other with a space between the pair of side wall portions 32b, 32b, and cuts the covering 12 of the wire 10 inserted from the opening 32c to form the outermost layer of the core wire 11. At least one pair of pressing members 34, 34 is provided to press the wire 11a (FIGS. 3, 4, 6 and 7). The core wire connecting body 32 shown here has three pairs of pressure contact bodies 34 , 34 . The three pairs of pressure contact bodies 34 , 34 are spaced apart from each other in the axial direction of the electric wire 10 assembled to the core wire connector 32 .

For example, when a twisted wire is used for the core wire 11, each pair of pressure contact bodies 34, 34 are arranged so that they do not come into contact with the same combination of strands 11a in consideration of the twist pitch of the core wire 11. It is desirable to define the spacing between adjacent ones. As a result, in the terminal fitting main body 30, the wires 11a in the outermost layer that are in contact are different for each pressure contact body 34, or the pressure contact bodies 34 may contact the same wire 11a in the outermost layer. However, since the combination of the wires 11a in the outermost layer that are in contact is different for each pressure contact body 34, each pair of pressure contact bodies 34, 34 should be used to contact most of the plurality of wires 11a in the outermost layer. can be done. That is, in this terminal fitting main body 30, when a twisted wire is used for the core wire 11, it is possible to increase the number of strands 11a in the outermost layer that are in contact with each pair of pressure contact members 34, 34. can.

The pair of press-contact members 34, 34 may each protrude from the bottom portion 32a toward the opening 32c. It may protrude from the side wall portion 32b toward one of the side wall portions 32b. The press-contact body 34 shown here is formed as a piece body obtained by bending a portion of the side wall portion 32b by 90 degrees.

The pair of press-contact members 34, 34 are arranged opposite to each other with a gap in the opposing arrangement direction of the pair of side wall portions 32b, 32b, and have press-contact end portions 34a, 34a into which the electric wire 10 is press-fitted (FIGS. 3 and 4). Figure 7). In the pair of pressure contact bodies 34, 34, the core wire 11 is sandwiched between the respective pressure contact end portions 34a, 34a, and the outermost layer strand 11a of the core wire 11 is connected from the respective pressure contact end portions 34a, 34a to the core wire 11a. By applying a pressing force, it is physically and electrically connected to the strands 11a of the outermost layer. Therefore, in the pair of pressure contact bodies 34, 34, the distance between the pressure contact end portions 34a, 34a is narrower than the diameter of the core wire 11. As shown in FIG. The press-contact end portion 34a may be formed as a flat surface along the insertion direction of the electric wire 10 from the opening 32c, or may be formed as a blade-shaped press-contact blade. The press contact end portion 34a shown here is formed as a plane having a thickness corresponding to the plate thickness of the base material.

The pair of press-contact members 34, 34 are insertion starting points when the wire 10 is press-fitted between the press-contact end portions 34a, 34a at the ends on the side of the opening 32c. , 34a. For example, the pair of pressure contact bodies 34, 34 are connected to the pressure contact ends 34a, 34a at the ends on the side of the opening 32c, respectively, and further extend from the boundary with the pressure contact ends 34a, 34a toward the opening 32c side. It has inclined portions 34b, 34b that widen the distance between them (FIGS. 3 and 7). The core wire lead-in portion is formed by the respective inclined portions 34b, 34b. The inclined portion 34b may be formed as a plane having a thickness corresponding to the plate thickness of the base material, or may be formed as a blade-shaped pressure contact blade. The inclined portion 34b shown here is formed as a pressure contact blade.

The electric wire 10 is inserted from the opening 32c into the space surrounded by the bottom portion 32a and the pair of side wall portions 32b, 32b. Along with this, the pair of pressure contact bodies 34, 34 cut the sheath 12 of the electric wire 10 that has been pushed in by the respective inclined portions 34b, 34b, exposing the outermost strand 11a of the core wire 11 in the sheath 12. . By further pushing the electric wire 10 inward, the outermost strand 11a of the exposed core wire 11 is rubbed along the respective pressure contact ends 34a, 34a, and the respective pressure contact ends 34a, 34a are rubbed. is pressed in between As a result, in the electric wire 10, the core wire 11 is brought into pressure contact between the pressure contact ends 34a, 34a, and the strand 11a of the outermost layer of the core wire 11 is connected to the terminal through the pressure contact ends 34a, 34a. It is physically and electrically connected to the fitting body 30 .

The covering connector 33 is composed of a bottom portion 33a and a pair of barrel pieces 33b, 33b projecting from both ends of the bottom portion 33a (FIGS. 1 and 4 to 6). In this covered connector 33, for example, the end of the electric wire 10 extends from an opening 33c (FIGS. 3, 4, 6 and 7) between the free ends 33b ₁ and 33b ₁ of the respective barrel pieces 33b and 33b. The cover 12 is placed on the inner wall surface (bottom surface) of the bottom portion 33a. The covering connector 33 is wound around the covering 12 of the end of the electric wire 10, for example, while the respective barrel pieces 33b, 33b are pressurized and deformed.

The lid member 40 has a lid body 41 assembled to and held by the free ends 32b ₁ and 32b ₁ of the pair of side wall portions 32b and 32b of the core wire connector 32 (FIGS. 1 to 7). The lid body 41 is fitted between the free ends 32b ₁ and 32b ₁ of the pair of side wall portions 32b and 32b. Therefore, the lid main body 41 shown here is formed in a rectangular flat plate shape.

The lid body 41 is held by the free ends 32b ₁ and 32b ₁ of the pair of side wall portions 32b and 32b via a holding structure 50 (FIGS. 1 and 4 to 6). A plurality of holding structures 50 are provided between the free end 32 b ₁ of the side wall portion 32 b and the lid body 41 . In this terminal fitting 20, two holding structures 50 are provided between the free end 32b1 of one side wall portion 32b and _one side portion of the lid main body 41, and the free end 32b of the other side wall portion 32b is provided. ₁ and the other side of the lid body 41, two holding structures 50 are provided.

The holding structure 50 includes a holding portion 51 provided on the free end _32b1 of the side wall portion 32b and a held portion 52 provided on the side portion of the lid body 41 (FIGS. 4 to 6). The holding structure 50 engages the holding portion 51 and the held portion 52 so that the state in which the lid body 41 is fitted between the free ends 32b ₁ and 32b ₁ is maintained. In the holding structure 50 shown here, a through hole provided in the free end _32b1 of the side wall portion 32b is used as the holding portion 51, and the projection portion fitted into the holding portion 51 is used as the held portion 52 of the lid body 41. protrude from the sides. In the terminal fitting 20, at least one of the side wall portion 32b and the lid body 41 is made flexible so that the held portion 52 can be fitted into the holding portion 51 at the four holding structures 50. As shown in FIG.

The lid member 40 is physically and electrically connected between the free end 32 b ₁ of the side wall portion 32 b and the side portion of the lid body 41 and between the holding portion 51 and the held portion 52 .

Furthermore, the lid member 40 is provided with at least one piercing body 42 that penetrates the coating 12 of the electric wire 10 and pierces between the strands of the core wire 11 inside the strand 11a of the outermost layer of the core wire 11 (see FIG. 3). Figure 7). The lid member 40 shown here is provided with one piercing body 42 . When the core wire 11 is formed by twisting a plurality of strand groups, the piercing body 42 is pierced between the strand groups or between the strands 11a forming the strand group.

In this terminal fitting 20, each pair of press-contact members 34, 34 contacts the outermost wire 11a of the core wire 11, and the piercing member 42 contacts the wire 11a inside the outermost layer. Therefore, this terminal metal fitting 20 comes into contact with many wires 11a regardless of the inner and outer layers of the core wire 11 compared to the conventional terminal fitting 20, and the contact area with the core wire 11 can be increased. 11 is suppressed. Furthermore, even if a force directed toward the opening 32c is applied to the wire 10, the terminal fitting 20 can restrict the movement of the wire 10 due to the force by the lid member 40. The state of contact between 34, 34 and the strand 11a of the outermost layer of the core wire 11, and the state of contact between the piercing body 42 and the strand 11a inside the outermost layer of the core wire 11 can be maintained. can. Therefore, the terminal metal fitting 20 can maintain its state while suppressing an increase in electrical resistance between the terminal metal fitting 20 and the core wire 11 .

Further, in the electric wire 10, when the wire 11a is made of aluminum or an aluminum alloy, an oxide film is formed on the surface of the wire 11a. However, while the electric wire 10 is being pushed, the pair of press-contact bodies 34, 34 are pressed against the outermost strand 11a of the core wire 11 by the respective inclined portions 34b, 34b and the respective press-contact ends 34a, 34a. Scrape off the oxide film. Therefore, the terminal fitting main body 30 can bring the pair of pressure-contact members 34, 34 into contact with the outermost strand 11a of the core wire 11 without an oxide film interposed therebetween. Further, while the piercing body 42 is piercing between the strands of the core wire 11, the piercing body 42 scrapes the surface of the strand 11a and scrapes off the oxide film on the surface. Therefore, the lid member 40 can bring the piercing body 42 into contact with the wires 11a inside the wires 11a of the outermost layer of the core wire 11 without intervening an oxide film. Therefore, this terminal fitting 20 can suppress an increase in electrical resistance between the core wire 11 and the wire 11a even when the wire 11a is made of aluminum or an aluminum alloy.

Here, in this terminal metal fitting 20, the increase in electrical resistance between the core wire 11 and the core wire 11 is appropriately suppressed by determining the arrangement and shape of the piercing body 42 as follows.

The piercing body 42 presses the strand 11a of the core wire 11 against the strand 11a of the core wire 11 and the pressing force from the pressure-contact body 34 against the strand 11a of the outermost layer of the core wire 11, so that the strand 11a interposed between the strand 11a and the strand 11a intervenes between the strand 11a. It is desirable to place it at a position where a clamping force is applied to it.

As a result, in this terminal fitting 20, between the pair of pressure contact bodies 34 and 34 and the outermost layer of the core wire 11a of the core wire 11, and between the piercing body 42 and the core wire 11 inside the outermost layer of the core wire 11, Firm contact with line 11a is now possible and can be maintained in that contact. Therefore, this terminal metal fitting 20 can appropriately suppress an increase in electrical resistance between itself and the core wire 11 .

Furthermore, the piercing body 42 pierces the electric wire 10 that has been completely attached to the core wire connector 32 (FIGS. 6 and 7). For this reason, in the terminal fitting 20, the pair of pressure contact bodies 34, 34 and the piercing body 42 are arranged in a positional relationship that allows the above-described clamping force to act. Since the piercing body 42 can be pierced between the strands of the core wire 11 whose position is regulated, the contact of the piercing body 42 with the strand 11a can be ensured. Therefore, this terminal metal fitting 20 can appropriately suppress an increase in electrical resistance between itself and the core wire 11 .

Furthermore, by arranging the piercing body 42 at a position where the aforementioned clamping force can be applied, the force with which the core wire 11 is pierced against the wires 11a is increased. Therefore, the piercing body 42 can effectively scrape off the oxide film on the surface of the wire 11a when the wire 11a is made of aluminum or an aluminum alloy. Therefore, this terminal fitting 20 can appropriately suppress an increase in electrical resistance between the core wire 11 and the wire 11a even when the wire 11a is made of aluminum or an aluminum alloy.

For example, the piercing body 42 is desirably positioned between the pair of pressing bodies 34, 34 in order to obtain the greatest clamping force.

In addition, the piercing body 42 has a shape that can be pierced between the strands of the core wire 11 until the tip reaches the outermost layer of the core wire 11 again from the point between the strands of the outermost layer of the core wire 11 where the tip starts to pierce. is desirable. As a result, the piercing body 42 can contact many strands 11a inside the outermost layer of the core wire 11, so that the contact area with the strands 11a inside can be increased. . Therefore, this terminal metal fitting 20 can appropriately suppress an increase in electrical resistance between itself and the core wire 11 .

Specifically, the piercing body 42 shown here protrudes from the lid body 41 toward the assembly direction of the lid body 41 to the core wire connector 32 (FIGS. 3 to 7). In other words, the piercing body 42 protrudes from the lid body 41 as a part of the lid member 40 . For this reason, the piercing body 42 shown here enters into the electric wire 10 in conjunction with the motion of attaching the lid member 40 to the core wire connector 32 . The lid main body 41 of the piercing body 42 is fitted into the opening 32c between the free ends 32b ₁ and 32b ₁ of the pair of side wall portions 32b and 32b of the core wire connecting body 32, and the holding portion 51 and the held portion 52 are engaged with each other and the cover main body 41 is held by the core wire connector 32, the piercing of the wire 10 is finished.

For example, the lid member 40 is made by press molding using a metal plate as a base material, as described above. Therefore, the piercing body 42 shown here is formed by bending a portion of the lid body 41 by 90 degrees. Furthermore, the tip of the piercing body 42 shown here is formed into a needle shape having a quadrangular pyramid shape. Moreover, the piercing body 42 shown here protrudes from the lid main body 41 at a position disposed between the pair of pressure contact bodies 34 , 34 .

As described above, the terminal fitting 20 of the present embodiment can suppress an increase in electrical resistance between itself and the core wire 11, so that the electrical connection stability with the core wire 11 can be improved. And since the electric wire 1 with a terminal is provided with this terminal metal fitting 20, the same effect as this terminal metal fitting 20 can be obtained.

By the way, the piercing body 42 of the previous specific example is provided as a part of the lid member 40 so as to protrude from the lid body 41 . Therefore, in this terminal fitting 20, when the cover member 40 is assembled to the core wire connector 32, the piercing body 42 first starts to pierce the electric wire 10, and the piercing body 42 continues to pierce the electric wire 10. At the end of the process, the lid body 41 is fitted into the opening 32c between the free ends 32b ₁ and 32b ₁ of the pair of side wall portions 32b and 32b of the core wire connector 32, so that the holding portion 51 and the held portion 52 are separated. engage. Therefore, in this terminal fitting 20, when a twisted wire is used for the core wire 11, depending on the position of each strand 11a of the core wire 11, the penetration path of the piercing body 42 between the strands of the core wire 11 is deviated. In the end, depending on the magnitude of the positional deviation between the lid body 41 and the opening 32c, there is a possibility that the paired holding portion 51 and the held portion 52 cannot be engaged.

Therefore, in this terminal metal fitting 20, first, the lid member 40 is replaced with the following lid member 140 (FIGS. 8 to 10). The lid member 140 corresponds to the lid member 40 without the piercing body 42, and includes a rectangular flat lid body 141 corresponding to the lid body 41 and held portions provided on the sides of the lid body 141. 52 (FIGS. 9 and 10). However, the cover main body 141 is formed with a through hole 141a through which a piercing body 142 described below is inserted.

Next, this terminal fitting 20 is provided with a piercing body 142 as a component separate from the lid member 140 (FIGS. 8 to 10). The piercing body 142 is provided as a component separate from the lid body 141 that can be inserted into the through hole 141 a of the lid body 141 assembled to the core wire connector 32 and attached to the lid body 141 . For example, the piercing body 142 is fitted into the through-hole 141a at the position where it has been attached to the lid body 141, thereby preventing it from being detached from the lid body 141. As shown in FIG.

The piercing body 142 shown here is shaped like a conical needle. Therefore, the through hole 141a of the lid body 141 is formed in a circular shape. Furthermore, the piercing body 142 shown here is provided with a disk-shaped locking portion 142a on the bottom surface side so that it is not inserted further at the position where the attachment to the lid body 141 is completed (FIGS. 8 to 8). 10).

In this terminal fitting 20, after the electric wire 10 is assembled to the core wire connection body 32 and the lid member 140 is assembled to the core wire connection body 32, the piercing body 142 is inserted into the through hole 141a of the lid main body 141, and the piercing body is inserted into the through hole 141a. 142 is stuck between the strands of the core wire 11 . Therefore, since the terminal fitting 20 can ensure the assembly of the core wire connector 32 and the lid member 140, the movement of the electric wire 10 can be restricted by the lid member 140. FIG. This terminal fitting 20 can prevent the penetration path of the piercing body 42 from shifting. Therefore, the terminal fitting 20 can suppress an increase in electrical resistance between the terminal fitting 20 and the core wire 11, so that the electrical connection stability with the core wire 11 can be improved. Since the electric wire 1 with a terminal is provided with the terminal fitting 20, the same effect as that of the terminal fitting 20 can be obtained.

When connecting a plurality of electric wires 10, the terminal fitting according to the present invention has, for example, the lengths of the pressure contact ends 34a, 34a of the pair of pressure contact bodies 34, 34 and the length of the piercing body 42 (142). are lengthened according to the number of wires 10 to be connected, and a plurality of wires 10 are connected to one combination comprising at least one pair of pressure contact bodies 34, 34 and at least one piercing body 42 (142). You may Further, when connecting a plurality of electric wires 10, the terminal fitting according to the present invention includes, for example, a combination of at least one pair of pressure contact bodies 34, 34 and at least one piercing body 42 (142) for each electric wire 10. It may be provided.

Reference Signs List 1 electric wire with terminal 10 electric wire 11 core wire 11a element wire 12 coating 20 terminal fitting 30 terminal fitting main body 32 core wire connection body 32a bottom portion 32b side wall portion 32b ₁ free end 32c opening 34 pressure contact body 40 lid member 41 lid body 42 piercing body 50 holding structure 140 lid member 141 lid body 141a through hole 142 piercing body

Claims (5)

a terminal fitting body;
a conductive lid member assembled to the terminal fitting body and held in the assembled state;
with
The terminal fitting body has a core wire connecting body that physically and electrically connects to the core wire of the electric wire in which the core wire composed of a plurality of strands is covered with a coating,
The core wire connector has a bottom and a pair of cantilever side walls erected from the bottom and opposed to each other with a space therebetween, and a space between the pair of side walls. and a pair of press contacts that are arranged to face each other with a space between them, and that are pressed against the outermost strand of the core wire by tearing the covering of the wire inserted through the opening between the free ends of the pair of side wall portions. having at least one set of bodies,
The terminal fitting is characterized in that the lid member is provided with at least one piercing body that pierces through the coating of the electric wire and pierces between the strands of the core wire inside the strands of the outermost layer. The piercing body exerts a clamping force on the wire interposed between the piercing body and the pressure contact body due to its own pressing force against the wire and the pressure force from the pressure contact body against the wire of the outermost layer. 2. The terminal fitting according to claim 1, wherein the terminal fitting is arranged at a position where the terminal fitting The piercing body has a shape that can pierce between the wires of the outermost layer, where the tip starts to pierce, until the tip reaches the outermost layer again. The terminal fitting according to claim 1 or 2. The lid member has a lid body attached to and held by the free ends of the pair of side walls,
The piercing body can be protruded from the lid body in the direction in which the lid body is assembled to the core wire connector, or can be inserted into a through hole of the lid body assembled to the core wire connector, and can be inserted into the lid body. 4. The terminal fitting according to claim 1, wherein the terminal fitting is a component separate from the attachable lid body. An electric wire in which a core wire composed of a plurality of strands is covered with a coating;
a terminal fitting attached to the electric wire;
with
The terminal fitting is
a terminal fitting body;
a conductive lid member assembled to the terminal fitting body and held in the assembled state;
with
The terminal fitting body has a core wire connection body that is physically and electrically connected to the core wire,
The core wire connector has a bottom and a pair of cantilever side walls erected from the bottom and opposed to each other with a space therebetween, and a space between the pair of side walls. and a pair of press contacts that are arranged to face each other with a space between them, and that are pressed against the outermost strand of the core wire by tearing the covering of the wire inserted through the opening between the free ends of the pair of side wall portions. having at least one set of bodies,
An electric wire with a terminal, wherein the lid member is provided with at least one piercing body that pierces the covering of the electric wire and pierces between the strands of the core wire inside the strands of the outermost layer.

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