JP3119434B2 - Connection structure and connection method between electric wire and tab-shaped terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between an electric wire constituting an internal circuit and a tab-shaped terminal and a method of connecting the same in an electric connection box used for interconnection of a wiring harness for an automobile and the like.

[0002]

2. Description of the Related Art There are various types of electric connection boxes, such as a relay box, a fuse box, a branch connection box, and a combination thereof. As shown in FIGS. And those using tab-shaped terminals. That is, the formation of the internal circuit is performed by providing a terminal press-fitting hole b in the insulating substrate (or insulating cover) a and press-fitting and fixing a tab-shaped terminal d to which the electric wire c is connected in the hole b, and protruding from the back surface. The terminals d are housed and arranged in a frame-shaped housing (not shown) and used as connector terminals.

[0003] Connection of the wire c and the terminal d is bent base end portion of the terminal d in the L-shaped to form a welded piece d _1, the exposed core c ₁ of the wire c to the welding piece d ₁ FIG. 21
And a pair of horns e, e for welding.

According to the conventional connection structure between an electric wire and a tab-shaped terminal, when the terminal d is assembled into the insulating substrate a by press-fitting,
An external force is applied to the connection portion to exert an adverse effect, and even after assembly, it is difficult to maintain a stable connection state due to an external force applied when connecting to the outside. Further, the horns e, e
Since the wires and terminals cannot be directly connected on the insulating substrate while the insulating substrate a is sandwiched from above and below, the connecting process of the wires and the terminals and the press-fitting and assembling process of the terminals to the insulating substrate are performed separately. Had to be done at the station.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the connection between the electric wire and the tab-shaped terminal is hardly affected by an external force. It is an object of the present invention to provide a connection structure and a connection method capable of forming a connection portion between an electric wire and a terminal directly on an insulating substrate.

[0006]

In order to achieve the above-mentioned object, a connection structure between an electric wire and a tab-shaped terminal according to the present invention comprises an L-shaped welding piece at a base end portion. A bent tab-shaped terminal, an insulating substrate provided with a plurality of terminal press-in holes, and wiring on the insulating substrate so that an exposed core wire at an intermediate portion or an end thereof is substantially aligned with the terminal press-in hole. The terminal is press-fitted and fixed in the terminal press-fitting hole, and the exposed core of the wire is sandwiched between the welding piece and the insulating substrate, and further the terminal welding piece and the exposed core of the wire. Is welded.

The connecting method may be a method for connecting an electric wire wired on an insulating substrate and a tab-shaped terminal press-fitted and fixed in a terminal press-fitting hole of the substrate. An L-shaped welding piece is provided at the base end of the terminal, and after the electric wire is wired on the insulating substrate, the terminal is press-fitted into the terminal press-fitting hole and the exposed core wire of the electric wire is welded. And one of the pair of resistance welding electrodes is set on the welding piece on the side facing the insulating substrate surface, and the other is set on the exposed core wire of the electric wire adjacent to the welding piece. The welding piece of the terminal and the exposed core wire of the electric wire are welded by resistance welding.

In the connecting structure of the first aspect, serrations are formed on the lower surface side of the L-shaped welding piece of the tab-shaped terminal (Claim 2), and an electric wire is provided at a free end of the L-shaped welding piece of the terminal. It is preferable that the pressing claw for the terminal bend (claim 3) or a V-shaped wire pressing groove be formed on the lower surface side of the L-shaped welding piece of the terminal (claim 4). In addition, it is recommended that a wiring guide is provided near each of the terminal press-fitting holes, and the electric wire is provided in the wiring guide (claim 5). As a preferable mode of the wiring guide, a pair of bosses having a curved inner surface facing each other is formed upright on the insulating substrate (Claim 6), or the wiring guide is formed by insulating the electric wire. An auxiliary wiring guide having a receiving seat perpendicular to the terminal press-fitting hole is provided, and the wire mounting groove is formed so as to be held at an appropriate distance from the board surface of the substrate. ).

In another connection structure, a plurality of tab-shaped terminals formed by bending an L-shaped welding piece at a base end and a welding piece portion of the terminal are fixed by insert molding. And a plurality of electric wires wired on the insulating substrate, the exposed core wire of the middle or end of which extends so as to overlap the welding piece of the terminal, and the surface of the welding piece of the terminal is It is exposed to the wiring side almost flush with the surface of the insulating substrate, and a welding window is opened on the back surface of the insulating substrate facing the center of the back surface of the welding piece. The welding piece of the terminal and the exposed core wire of the electric wire are welded.

In the above connection method, the surface of the L-shaped welding piece bent at the base end of the tab-shaped terminal is exposed to the insulating substrate and fixed by insert molding. At the same time, a welding window is provided facing the center of the back surface of the welding piece, and after the exposed core wire of the electric wire is overlapped on the surface of the welding piece, the terminal is formed by a pair of upper and lower electrodes using the welding window. Is welded to the exposed core wire of the electric wire.

According to another aspect of the present invention, a plurality of tab-shaped terminals formed by bending an L-shaped welding piece at a base end portion, and the welding piece portion of the terminal is formed by a thickness of an insulating substrate. An insulating substrate buried and fixed by insert molding at a substantially central portion in the vertical direction, and disposed on both surfaces or one surface of the insulating substrate, and an exposed core wire at an intermediate portion or an end thereof extends so as to overlap with a welding piece of the terminal. A plurality of electric wires, a welding window is opened on both front and back surfaces of the insulating substrate facing the center of the welding piece, and at the portion of the welding window, a welding piece of the terminal and an exposed core wire of the electric wire. Is welded.

[0012] In the connecting method, an L-shaped welding piece bent at the base end of the tab-shaped terminal with respect to the insulating substrate may be formed at a substantially central portion in a thickness direction of the insulating substrate. Along with embedding and fixing by insert molding, a welding window is provided facing the center of both front and back surfaces of the welding piece, and after overlapping the exposed core wire of the electric wire on at least one surface of the welding piece, the welding window is The welding piece of the terminal and the exposed core wire of the electric wire are welded by a pair of upper and lower electrodes.

Still another connection structure is a thirteenth aspect.
As described in the above, a tab-shaped terminal formed by bending an L-shaped welding piece at the base end, an insulating substrate provided with a plurality of terminal press-fit holes,
A conductive metal chip fixed to the insulating substrate by insert molding in opposition to the terminal press-fitting hole, and a wiring is provided on the insulating substrate, and an exposed core wire at an intermediate portion or an end thereof is overlapped with the metal chip. A surface of the metal chip is exposed to the wiring side substantially flush with the insulating substrate, and is welded to a rear surface of the insulating substrate so as to face a center of the rear surface of the metal chip. A window is opened, the terminal is press-fitted and fixed in the terminal press-fitting hole, an exposed core of the electric wire is sandwiched between the welding piece and the metal tip, and further, a welding piece of the terminal, an exposed core of the electric wire and a metal tip. Is welded.

According to the present invention, there is provided a method for connecting an electric wire wired on an insulating substrate to a tab-shaped terminal press-fitted and fixed in a terminal press-fitting hole of the substrate. At the base end of the terminal, a welding piece bent into an L shape is provided, and the surface of the conductive metal chip is exposed by facing the terminal press-fitting hole of the insulating substrate and fixed by insert molding, A welding window is provided at the center of the back surface of the metal chip, and after the wires are wired on the insulating substrate, the terminals are press-fitted and fixed in the terminal press-in holes, and the exposed core of the wires is sandwiched between the metal chips and the welding pieces. After that, the welding piece of the terminal, the exposed core wire of the electric wire, and the metal tip are welded by a pair of upper and lower electrodes using the welding window.

In each of the connection structures of the eighth, tenth, and thirteenth aspects, similarly to the fifth aspect, a wiring guide is provided in the vicinity of the terminal press-fitting hole, and an electric wire is provided in the wiring guide. It is preferable (claims 9, 11, 14), and the wiring guide groove of claim 11 preferably extends so as to cross the welding window (claim 12).

According to the first and fifteenth aspects of the present invention, the exposed core wire of the electric wire has a structure in which it is welded while being sandwiched between the welding piece of the terminal and the insulating substrate. And the electrical connection is stable and reliable. Further, due to the above structural features, the connection between the electric wire and the terminal can be performed at the same station as the step of press-fitting the terminal onto the insulating substrate, so that cost reduction by space saving and labor saving is possible.

Further, in the connection structure according to the first aspect, serrations are formed on the lower surface side of the L-shaped welding piece (claim 2), and a holding claw for the electric wire is formed at a free end of the welding piece. (Claim 3) By doing so, the pressing force or the holding force on the electric wire increases. Further, the V-shaped wire holding groove (claim 4) on the lower surface side of the welding piece makes the welding piece two-point contact with the wire to facilitate positioning, and the wire bites into the wire holding groove during welding. Therefore, the welding area is increased, and the stability and reliability of the electrical connection are improved.

Further, in the connection structure according to the first aspect, a wiring guide is provided near each of the terminal press-fitting holes, and the electric wire is disposed in the wiring guide. Positioning is performed automatically. By arranging the wiring guide on the insulating substrate as a pair of opposing bosses having curved inner surfaces (Claim 6), the electric wire is positioned and fixed in a state of overlapping with the welding piece, so that the wiring and the wiring are fixed. Welding becomes easier.
Further, by forming the wiring guide with a wire mounting groove and providing an auxiliary wiring guide having a seat perpendicular to the terminal press-fitting hole (claim 7), the wire can be removed from the plate surface of the insulating substrate. Since the heat can be held at appropriate intervals, high heat during welding is not directly transmitted to the insulating substrate, so that the melting and deformation of the insulating substrate can be prevented.

According to the present invention, the tab-shaped terminal is fixed to the insulating substrate by insert molding in a state where one surface of the L-shaped welding piece is exposed to the outside, flush with the plate surface of the insulating substrate, Using the welding window on the back side, the welding piece and the exposed core wire can be welded from both sides of the insulating substrate, and the same effects as above are obtained, such as high mechanical strength, stable electrical connection and high reliability. In addition to these, the fixing structure of the tab-shaped terminal by the insulating substrate is further stabilized.

According to the tenth and seventeenth aspects of the present invention, since the welding pieces are fixed to the insulating substrate and the welding windows are opened on both sides, the electric wires are arranged on the front and back surfaces of the insulating substrate and welded. It is possible to simplify the layout and arrangement of electric wires.

According to the thirteenth and eighteenth aspects of the present invention, the terminal press-fitted and fixed to the insulating substrate is further welded and fixed to the metal chip embedded and fixed in the substrate via an electric wire. The fixing structure is reinforced, and the mechanical strength of the connection between the terminal and the electric wire is indirectly increased. This provides a structure that is less susceptible to an external force at the time of fitting, disengaging, and the like with the counterpart terminal.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of an embodiment of the present invention will be described below with reference to FIGS. In these figures, 1 is a tab-shaped terminal, 2 is an insulating substrate, 3 is an electric wire, and an L-shaped welding piece 7 is formed at the base end of the terminal 1 by bending. Although the electric wire 3 is shown as a single core in the embodiment, it may be a stranded wire. In addition, either a bare wire or an insulated wire may be used as long as the portion connected to the welding piece 7 is exposed to the outside as a core wire. The insulating substrate 2 is provided with a plurality of wire guides 4 for positioning the wires 3 to be wired, and correspondingly elongated terminal press-in holes 5. The electric wire guide 4 has a pair of bosses 4a, 4 opposing each other.
The inner surface of each boss is formed as a curved surface 4b that matches the outer periphery of the electric wire 3. In the electric wire guide 4, the axis P of the electric wire 3 positioned by the pair of bosses 4a, 4a in the vicinity of each terminal press-in hole 5 is substantially parallel to the elongated terminal press-in hole 5, and the electric wire 3 and the terminal press-in hole 5 are arranged. Provided to fit.

Next, the connection between the electric wire 3 and the terminal 1 will be described. First, an electric wire 3 is wired in a desired pattern on an insulating substrate 2, and one end of the electric wire 3 is connected to a pair of bosses 4 of a wiring guide 4.
The terminal portion 3a is positioned by pushing it between the terminals a and 4a so that the terminal portion 3a comes immediately before the terminal press-fitting hole 5. Next, the terminal 1 is press-fitted and fixed in the terminal press-fitting hole 5, so that the terminal 3
a is sandwiched between the welding piece 7 of the terminal 1 and the insulating substrate 2. In this state, a pair of resistance welding electrodes 6, 6 on the side facing the plate surface of the insulating substrate 2, that is, above the welding piece 7.
Is set on the welding piece 7, the other is set on the electric wire 3 adjacent to the welding piece 7, and a large current flows between the two electrodes, so that the electric wire 3 and the welding piece 7 instantaneously Resistance welding.

As described above, since the terminal portion 3a of the electric wire 3 is welded while being sandwiched between the welding piece 7 of the terminal 1 and the insulating substrate 2, the mechanical strength of the connection portion is large and the external force The structure is less susceptible to the influence of electrical connection, and the electrical connection is highly reliable. In addition, since the connection between the electric wire 3 and the terminal 1 can be performed at the same station as the wiring of the electric wire 3 to the insulating substrate 2 and the press-fitting and assembling step of the terminal 1, waste of stocking and transferring a semi-finished product between the respective steps is avoided. It is possible to save space and to reduce costs by saving space and labor.

FIGS. 4A and 4B show another embodiment of the terminal 1 used in the present invention. FIG. 4A shows an L-shaped welding piece 7 having a serration 7a formed on the lower surface thereof. B) shows the electric wire 3 by bending the free end of the welding piece 7 downward at a right angle.
Is formed with a pressing claw 7b. In either case, the pressing force or the holding force on the electric wire 3 increases. FIGS. 5A and 5B show another embodiment of the terminal 1 used in the present invention. A V-shaped wire holding groove is provided on the lower surface side of the L-shaped welding piece 7 along the wire arrangement direction. 7c is formed. The width of the wire holding groove 7c is set wide so that the wire 3 comes into two-point contact with the wire 3 at the point Q and the wire 3 can be stably held down. It is appropriate that the depth of the wire holding groove 7c is approximately の of the plate thickness of the welding piece 7 and the width is approximately の of the wire diameter. Due to the presence of the wire holding groove 7c, the welding piece 7 comes into two-point contact with the wire 3 as described above, so that the positioning is easy, and the wire 3 is welded in a state where the wire 3 is partially cut into the welding piece 7, and a large welding area is secured. Therefore, the stability and reliability of the electrical connection are improved.

FIGS. 6 to 8 show another embodiment of the present invention. 6 and 7, a wiring guide 8 having a wire mounting groove 8a is provided upright on the insulating substrate 2 instead of the wiring guide 4 including the pair of bosses 4a, 4a. Is a seat 9a so as to be orthogonal to the hole 5.
Are provided.

As is clear from FIGS. 6 and 8, the terminal portion 3a of the electric wire 3 is appropriately spaced from the plate surface of the insulating substrate 2 by the electric wire guide 8, the electric wire mounting groove 8a of the auxiliary wiring guide 9 and the seat 9a. It is fixed in a state where it floats at A. Therefore, as in the case of FIGS.
When the electric wire 3 and the welding piece 7 are welded and connected by 6, the high heat from the electric wire 3 is not directly transmitted to the insulating substrate 2, so that the erosion and deformation thereof can be prevented. Further, by employing the auxiliary wiring guide 9, the height B from the insulating substrate 2 to the welding piece 7 is clearly higher than in the case of FIGS. As a result, it is possible to reduce the decrease in the press-in force due to the thermal influence on the terminal press-in hole 5.

9 to 11 show another embodiment of the present invention. That is, the insulating substrate _{2. 1,} FIG. 1 in the same manner as in the routing guide 4 is provided, the 'terminal 1' having a longer welding pieces 7 than welding pieces 7 of the terminal 1 is fixed integrally by insert molding ing. The surface of the welding piece 7 'is the insulating substrate 2
While exposed the same as the _first plate surface, the electrode windows 10 in the insulating substrate 2 ₁ so as to the back surface center thereof is exposed is provided. In this case, as shown in FIGS. 10 and 11, the terminal portion 3a of the electric wire positioned by the wiring guide 4 is placed on the surface of the welding piece 7 'as it is, and the insulating substrate 2 ₁
Can be welded from both front and back surfaces by using a pair of upper and lower resistance welding electrodes 6 ', 6' (or an ultrasonic welding horn) using a welding window 10.

The terminal 1 'from being fixed by insert molding integrally with the insulating substrate 2 _1, the electric wire 3 and the welding strips 7'
The structure of the connecting portion has a large mechanical strength as described above,
Hardly affected by external force, high reliability of electrical connection. The terminal 1 'is previously insulated is fixed to the substrate 2 _1, wiring step and the terminal 1 of the wire 3' can be performed welding process with the same station.

FIGS. 12 to 14 show still another embodiment of the present invention. Figure in 12 and 13, 'but is fixed integrally by insert molding, the welding strips 7' is on one side of the insulating substrate 2 ₂ terminal 1 as viewed in the thickness direction of the insulating substrate 2 ₂ thickness t The electrode windows 10 ', 10' are provided on both the front and back sides so that the central portions of the front and back sides of the welding piece 7 'are exposed. That is, between the 'weld piece 7 exposed to' electrode window 10 insulating substrate 2 and _second plate surfaces have steps at both sides, so to speak welding strip 7 'is recessed on one side of the insulating substrate 2 ₂ ( Window for electrode 1
0 '). Then, the front and back surfaces of insulating substrate 2 _2, the wiring guide groove 11 which communicates with the electrode window 10 'is formed. The wiring guide groove 11 is formed so that the groove bottom is flush with the welding piece 7 '.
It is preferable to provide an extension 11a extending on the opposite side of the electrode window 10 'so that the terminal portion 3a of the electric wire 3 can be wired across the electrode window 10'.

[0031] In FIG. 14 (A), the on the insulating substrate 2 are wired by bending in two wires 3 _1, 3 ₂ to bypass each other U-shaped, its two end portions are the same as FIG. 10 It is connected to terminal 1 'by a connection structure. This insulating substrate 2 ₁ is for a single-sided wiring structure. In FIG. 14 (B), the since the insulating substrate 2 ₂ is a double-sided wiring structure, the electric wire 3 ₁ and the electric wire 3 ₂ linearly in parallel with the wiring, connected to the wire 3 _3, 3 ₄ wiring on the back surface at one end By connecting
4 (A), an equivalent circuit is formed, and the layout and wiring of electric wires are simplified and the density is increased.

FIG. 15 shows a terminal 1 'used in FIGS.
Another embodiment is shown, on the surface side of the L-shaped welding piece 7 ′,
5 (A) and 5 (B), a V-shaped wire receiving groove 7c '.
Is formed. The reciprocal relationship between the electric wire receiving groove 7c 'and the electric wire 3 is the same as that of the electric wire holding groove 7c, and the description is omitted. Since the electric wire receiving groove 7c 'makes two contact points when welding the electric wire 3, the electric wire 3 is well seated and easy to position, and the electric wire 3 is welded in a state where the electric wire 3 bites into the welding piece 7, and Since a large welding area is ensured, the mechanical strength of the connection portion is improved, and the reliability of the electrical connection is increased due to an increase in the resistance to an external force.

FIGS. 16 to 18 show still another embodiment of the invention in which FIGS. 2 and 10 are combined. That is,
With the wire guide 4 and the terminal press-fitting hole 5 as in FIG 2 is provided on the insulating substrate 2 _3, the terminal press-fitting hole 5 to face the conductive metal chip 12 is fixed integrally by insert molding. The surface of the metal tip 12, 10 are exposed in the same insulating substrate 2 ₃ flush with, electrode window 10 is provided on the back surface. In this case, as shown in FIGS. 17 and 18, the terminal portion 3 a of the electric wire 3 positioned by the wiring guide 4 is placed on the metal chip 12, and then the terminal 1 is pressed into the terminal press-in hole 5. The terminal portion 3a is sandwiched between the metal tip 12 and the welding piece 7 from above and below. Next, as in the case of FIG. 11, welding is performed by a pair of upper and lower resistance welding electrodes 6 'and 6' (or an ultrasonic welding horn) using the welding window 10 '.

According to the connection structure shown in FIG.
Press-fitting a fixed tab-shaped terminal 1 is further fixed by welding to the metal tip 12 through the electric wire 3, the metal chip 12 is integrally fixed to the insulating substrate 2 _3. Accordingly, the fixing structure of the tab-shaped terminal 1 and the insulating substrate 2 ₃ reinforcement, the mechanical strength of the connection portion of the tab-shaped terminal 1 and the electric wire 3 is also reinforced indirectly. This provides a structure that is less susceptible to an external force at the time of fitting, disengaging, and the like with the counterpart terminal.

[0035]

As described above, according to the first and fifteenth aspects of the present invention, the exposed core of the electric wire has a structure in which it is welded in a state of being sandwiched between the welding piece of the terminal and the insulating substrate. It has high mechanical strength and is not easily affected by external force, so that the electrical connection is stable and reliable. Further, due to the above structural features, the connection between the electric wire and the terminal can be performed at the same station as the step of press-fitting the terminal onto the insulating substrate, so that cost reduction by space saving and labor saving is possible.

According to the second and third aspects of the present invention, serrations are formed on the lower surface side of the L-shaped welding piece.
Further, since the pressing claws for the electric wire are bent at the free ends of the welding pieces, the pressing force or the holding force against the electric wire increases. Furthermore, according to the invention of claim 4,
Due to the presence of the V-shaped wire holding groove on the underside of the welding piece,
The welding piece makes two-point contact with the electric wire to facilitate positioning, and when welding, the electric wire bites into the wire holding groove, increasing the welding area and improving the stability and reliability of the electrical connection. I do.

According to the fifth aspect of the present invention, the wiring guides are provided in the vicinity of the terminal press-fit holes, and the wires are disposed in the wiring guides, whereby the positioning of the wires with respect to the tab-shaped terminals is automatically performed. According to the invention of claim 6, the wiring guide is erected on the insulating substrate as a pair of opposing bosses whose inner surfaces are curved surfaces, and the electric wire is positioned and fixed in a state where the electric wire overlaps the welding piece. And welding becomes easy. According to the seventh aspect of the present invention, since the wiring guide is formed with the electric wire mounting groove and the auxiliary wiring guide having the seat is provided orthogonally to the terminal press-fitting hole, the electric wire is formed on the insulating substrate. Can be held at an appropriate distance from the plate surface, and the high heat during welding is not directly transmitted to the insulating substrate, so that its melting and deformation can be prevented.

According to the present invention, the tab-shaped terminal is fixed to the insulating substrate by insert molding in a state where one side of the L-shaped welding piece is exposed to the outside flush with the plate surface of the insulating substrate. Since the welding piece and the exposed core wire can be welded from both sides of the insulating substrate by using the welding window on the back surface, the fixing structure of the tab-shaped terminal by the insulating substrate is further stabilized in addition to the effect described above.

According to the tenth and seventeenth aspects of the present invention,
Since the welding pieces are embedded and fixed in the insulating board and the welding windows are open on both sides, the wires can be arranged and welded on both front and back sides of the insulating board, simplifying the routing and arrangement of the wires and Higher density can be achieved.

According to the thirteenth and eighteenth aspects of the present invention, the terminal press-fitted and fixed to the insulating substrate is further welded and fixed to the metal chip embedded and fixed in the substrate via an electric wire. The fixing structure is reinforced, and the mechanical strength of the connection between the terminal and the electric wire is indirectly increased. This provides a structure that is less susceptible to an external force at the time of fitting, disengaging, and the like with the counterpart terminal.

[Brief description of the drawings]

FIG. 1 is a perspective view of a circuit board using a connection structure between an electric wire and a tab-shaped terminal according to the present invention.

FIG. 2 is an enlarged perspective view showing a connection structure between a tab-shaped terminal and an electric wire in FIG. 1;

FIG. 3 is a longitudinal sectional view of FIG. 2;

FIGS. 4A and 4B are perspective views each showing another embodiment of the tab-shaped terminal of FIG. 1;

5 (A) is a perspective view showing another embodiment of the tab-shaped terminal of FIG. 1, and FIG. 5 (B) is a partially enlarged view showing a relationship with the electric wire.

FIG. 6 is a perspective view of a main part of an insulating substrate showing another embodiment of the present invention.

FIG. 7 is a perspective view of a connection structure between a tab-shaped terminal and an electric wire showing another embodiment of the present invention using the insulating substrate of FIG. 6;

FIG. 8 is a partial sectional view of FIG. 7;

FIG. 9 is a perspective view of a circuit board using a connection structure between an electric wire and a tab-shaped terminal according to another embodiment of the present invention.

FIG. 10 is an enlarged perspective view of a main part of FIG. 9;

FIG. 11 is a partial longitudinal sectional view of FIG.

FIG. 12 is a perspective view of a circuit board using a connection structure between a wire and a tab-shaped terminal, showing still another embodiment.

FIG. 13 is a partial sectional view of FIG.

14A and 14B are explanatory diagrams of wiring patterns of a circuit board using the connection structures of FIGS. 10 and 12, respectively.

FIG. 15 is a perspective view showing another embodiment of the tab-shaped terminal shown in FIGS. 10 and 12;

FIG. 16 is a perspective view of a circuit board using a connection structure between an electric wire and a tab-shaped terminal according to still another embodiment of the present invention.

FIG. 17 is an enlarged perspective view of a main part of FIG. 16;

18 is a partial longitudinal sectional view of FIG.

FIG. 19 is a perspective view of a circuit board using a conventional connection structure between tab terminals and electric wires.

20 is an enlarged perspective view of a main part of FIG. 19;

21 is a longitudinal sectional view showing the welding method of FIG.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 tab-shaped terminal 2, 2 ₁ , 2 ₂ insulating substrate 3, 3 ₁ , 3 ₂ electric wire 4 wiring guide 5 terminal press-in hole 6, 6 'resistance welding electrode 7, 7' welding piece 8 wiring guide 9 auxiliary wiring guide 10, 10 'electrode window 11 wiring guide groove

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01R 4/02 H01R 43/02 H01R 4/58 H02G 3/16

Claims (18)

(57) [Claims] 1. A tab-shaped terminal having a base end formed by bending an L-shaped welding piece, an insulating substrate provided with a plurality of terminal press-in holes, an intermediate portion or an end portion wired on the insulating substrate. And a plurality of wires extending so that the exposed core wire is substantially aligned with the terminal press-in hole.The terminal is press-fitted and fixed in the terminal press-in hole, and the exposed core wire of the wire is formed by the welding piece, the insulating substrate, A connection piece between the electric wire and the tab-shaped terminal, wherein a welding piece of the terminal and an exposed core wire of the electric wire are welded together. 2. The connection structure between an electric wire and a tab-shaped terminal according to claim 1, wherein serrations are formed on a lower surface side of the L-shaped welding piece of the tab-shaped terminal. 3. The holding tab for an electric wire is bent at a free end of an L-shaped welding piece of the tab-shaped terminal.
Or the connection structure of the electric wire and tab-shaped terminal of 2. 4. The connection structure between an electric wire and a tab-shaped terminal according to claim 1, wherein a V-shaped electric wire pressing groove is formed on a lower surface side of the L-shaped welding piece of the tab-shaped terminal. 5. The electric wire and tab-like terminal according to claim 1, wherein a wiring guide is provided near each of said terminal press-fit holes, and said electric wire is provided in said wiring guide. Connection structure. 6. The connection structure between an electric wire and a tab-shaped terminal according to claim 5, wherein the wiring guide is formed by erected on the insulating substrate, a pair of opposing bosses whose inner surfaces are curved surfaces. . 7. The wiring guide is formed to have an electric wire mounting groove so that the electric wire can be held at an appropriate distance from the plate surface of the insulating substrate, and is received orthogonally to the terminal press-fitting hole. 7. The connection structure between an electric wire and a tab-shaped terminal according to claim 5, wherein an auxiliary wiring guide having a seat is provided. 8. A plurality of tab-shaped terminals formed by bending an L-shaped welding piece at a base end, an insulating substrate having a welding piece portion of the terminal fixed by insert molding, and wiring on the insulating substrate; An exposed core wire at an intermediate portion or an end portion is formed of a plurality of electric wires extending so as to overlap with the welding piece of the terminal, and the surface of the welding piece of the terminal is substantially flush with the surface of the insulating substrate on the wiring side. A welding window is opened on the back surface of the insulating substrate facing the center of the back surface of the welding piece, and the welding piece of the terminal and the exposed core wire of the electric wire are welded at the portion of the welding window. A connection structure between an electric wire and a tab-shaped terminal. 9. The connection structure between an electric wire and a tab-shaped terminal according to claim 8, wherein a wiring guide is provided near each of the terminal press-fit holes, and the electric wire is provided in the wiring guide. 10. A plurality of tab-shaped terminals having L-shaped welding pieces bent at a base end thereof, and the welding piece portions of the terminals are embedded and fixed to a substantially central portion in a thickness direction of the insulating substrate by insert molding. An insulating substrate, and a plurality of electric wires disposed on both surfaces or one surface of the insulating substrate and having an exposed core wire at an intermediate portion or an end thereof extending so as to overlap with a welding piece of the terminal; A welding window is opened facing a central portion of the welding piece, and a welding piece of the terminal and an exposed core wire of the wire are welded at a portion of the welding window, Connection structure with terminal. 11. The electric wire and tab according to claim 10, wherein a wiring guide groove is provided on both front and back surfaces or one surface of the insulating substrate in the vicinity of the terminal press-in hole, and the electric wire is provided in the wiring guide groove. Connection structure with terminals. 12. The connection structure between an electric wire and a tab-like terminal according to claim 11, wherein the wiring guide groove extends so as to cross the welding window. 13. A tab-shaped terminal formed by bending an L-shaped welding piece at a base end, an insulating substrate provided with a plurality of terminal press-in holes,
A conductive metal chip fixed to the insulating substrate by insert molding in opposition to the terminal press-fitting hole, and a wiring is provided on the insulating substrate, and an exposed core wire at an intermediate portion or an end thereof is overlapped with the metal chip. A surface of the metal chip is exposed to the wiring side substantially flush with the insulating substrate, and is welded to a back surface of the insulating substrate so as to face a center of the back surface of the metal chip. A window is opened, the terminal is press-fitted and fixed in the terminal press-fitting hole, an exposed core of the electric wire is sandwiched between the welding piece and the metal tip, and further, a welding piece of the terminal, an exposed core of the electric wire and a metal tip. A connection structure between an electric wire and a tab-shaped terminal, wherein the terminal is welded. 14. The connection structure between an electric wire and a tab-shaped terminal according to claim 13, wherein a wiring guide is provided near each of the plurality of terminal press-fit holes, and the electric wire is wired to the wiring guide. 15. A connection method between an electric wire wired on an insulating substrate and a tab-shaped terminal press-fitted and fixed in a terminal press-fitting hole of the substrate, wherein the base end of the tab-shaped terminal is folded into an L-shape. After the bent welding piece is provided and the electric wire is wired on the insulating substrate, the terminal is press-fitted and fixed in the terminal press-fitting hole, and the exposed core wire of the electric wire is sandwiched between the welding piece and the insulating substrate. On the side facing the substrate surface, one of the pair of resistance welding electrodes is set on the welding piece, the other is set on the exposed core wire of the wire adjacent to the welding piece, and the welding piece of the terminal and the wire are set by resistance welding. A method for connecting an electric wire and a tab-shaped terminal, wherein the exposed core wire is welded. 16. The surface of an L-shaped welding piece bent at the base end of the tab-shaped terminal is exposed to the insulating substrate and fixed by insert molding, and faces the center of the back surface of the welding piece. After the welding window is provided and the exposed core of the electric wire is overlapped on the surface of the welding piece, the welding piece of the terminal and the exposed core of the electric wire are welded by a pair of upper and lower electrodes using the welding window. A method for connecting an electric wire and a tab-shaped terminal. 17. An L-shaped welding piece bent at the base end of the tab-shaped terminal with respect to the insulating substrate is buried and fixed at a substantially central portion in the thickness direction of the insulating substrate by insert molding.
A welding window is provided facing the center of the front and back surfaces of the welding piece,
After overlapping the exposed core wire of the electric wire on at least one surface of the welding piece, the welding piece of the terminal and the exposed core wire of the electric wire are welded by a pair of upper and lower electrodes using the welding window. To connect to the tab terminal. 18. A method for connecting an electric wire wired on an insulating substrate and a tab-shaped terminal press-fitted and fixed in a terminal press-fitting hole of the substrate, wherein the base end of the tab-shaped terminal is bent into an L-shape. A formed welding piece is provided, the surface of the conductive metal chip is exposed and fixed by insert molding in opposition to each terminal press-in hole of the insulating substrate, and a welding window is provided at the center of the back surface of the metal chip. After the wire is wired on the insulating substrate, the terminal is press-fitted and fixed in the terminal press-fitting hole, and the exposed core wire of the wire is sandwiched between the metal tip and the welding piece, and then up and down using the welding window. A method for connecting an electric wire and a tab-shaped terminal, wherein a welding piece of the terminal, an exposed core wire of the electric wire, and a metal tip are welded by a pair of electrodes.