JP2011172393A - Bus bar circuit structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bus bar circuit structure having a new structure, capable of ensuring satisfactory conductivity while achieving superior versatility and the yield. <P>SOLUTION: The bus bar structure 10 is configured by including two bus bars 12a, 12b, and a joint metal fixture 14 incorporated between connection side ends 40, 40 of the two bus bars 12a, 12b to conduct the two bus bars 12a, 12b to each other. In the joint metal fixture 14, a clamper 37 for clamping the two bus bars 12a, 12b in a plate thickness direction is formed, and locking protrusions 38a, 38b formed on the joint metal fixture 14 are inserted into slits 44, 44 formed on the two bus bars 12a, 12b to form a ratcher for blocking coming-off of the bus bars 12a, 12b from the joint metal fixture 14. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bus bar circuit structure that is housed in an electrical connection box or the like mounted on an automobile and constitutes an internal circuit.

  Conventionally, an electric junction box mounted on an automobile has housed an internal circuit for efficiently distributing power from a battery to in-vehicle electrical components, etc. The bus bar comprised using is widely used.

  By the way, such a bus bar is formed by press punching a metal flat plate. For example, as described in FIG. 2 of Japanese Patent Application Laid-Open No. 2006-42586 (Patent Document 1), the bus bar has a predetermined portion of a conductive portion that is bent into a predetermined shape in accordance with a required circuit configuration. Thus, the connection part to the electrical component, the conductive leg part inserted into the through hole of the printed circuit board, and the like are integrally formed.

  However, in the bus bar which is such an integrally molded product, the shape of the bus bar is different for each circuit configuration, so that it is necessary to change the press die each time. Further, since the entire bus bar is large, it is inevitable that the mold itself is large. Therefore, the conventional structure of the bus bar has poor versatility and has a problem of high cost. In addition, in a structure in which a large flat metal material is stamped and punched, there is a large amount of waste material, and improvement in yield has been demanded.

JP 2006-42586 A

  The present invention has been made in the background of the above-mentioned circumstances, and the solution is to provide a novel structure capable of ensuring good conductivity while realizing excellent versatility and yield. Another object is to provide a bus bar circuit structure.

  The first aspect of the present invention includes two bus bars that are connected to each other to form a conductive path, and a joint fitting that is assembled between the connection side end portions of the two bus bars to conduct the two bus bars. In the joint fitting, a sandwiching portion is formed for sandwiching the two bus bars in the thickness direction, and the joint fitting is formed with respect to the slit formed in each of the two bus bars. The bus bar circuit structure is provided with locking means into which locking protrusions are inserted to prevent the bus bars from coming out of the joint fitting.

  According to the bus bar circuit structure having a structure according to the present invention, the two bus bars functioning as the conductive paths are connected to each other through the joint metal fittings to form a desired circuit. A bus bar circuit structure is provided. And since the bus bar and the joint fitting are formed separately from each other, the shape of the bus bar can be simplified and the size can be reduced. Thereby, the manufacturing cost can be reduced by improving the yield and reducing the size of the mold.

  Moreover, it becomes possible to comprise arbitrary circuit shapes by connecting a some bus bar with several joint metal fittings. Thereby, the bus bar which has been conventionally an integrally molded product having a specific circuit shape can be provided as a versatile bus bar circuit structure.

  In addition, the connection between the bus bar and the joint metal fitting is realized by a holding portion that sandwiches the bus bar in the thickness direction. Thereby, the contact area of a bus bar and a joint metal fitting can be ensured largely, and conduction | electrical_connection stability can be ensured. Then, by providing the locking means, it is possible to reliably prevent the bus bar sandwiched between the holding portions from sliding out of the joint fitting. Thereby, the conduction | electrical_connection state of a bus-bar and a joint metal fitting can be hold | maintained reliably, and conduction | electrical_connection stability can be ensured. Further, when providing the locking means, it is only necessary to form a slit in the bus bar, and the locking means can be provided without affecting the simplification and miniaturization of the bus bar.

  According to a second aspect of the present invention, in the first aspect, in the joint fitting, a base plate portion on which the bus bar is superimposed, and a tongue piece that presses the bus bar against the base plate portion. However, they are integrally formed, and the base plate portion and the tongue piece constitute the clamping portion.

  According to this aspect, the bus bar can be reliably brought into contact with and held by the joint fitting by using the pressing force of the tongue piece against the base plate portion. Further, since the bus bar is inserted between the tongue piece having a predetermined width dimension and the base plate portion, the bus bar can be easily inserted into the holding portion, and reliable conduction can be ensured with a wide contact area. . In addition, you may form the tongue piece in this aspect, for example by cutting and raising the center part of a base board part.

  According to a third aspect of the present invention, in the one described in the second aspect, in the joint fitting, the tongue piece pressing one of the bus bars against the base plate portion, and the other bus bar of the base plate portion. The tongue pieces to be pressed against each other are formed independently of each other. According to this aspect, since each bus bar is held between the respective tongue pieces, each bus bar can be more stably connected to the joint fitting.

  According to a fourth aspect of the present invention, in the above-described second or third aspect, in the joint fitting, the tongue piece extends from an end edge portion of the base plate portion on which the bus bar is overlapped. The tongue piece is folded and overlapped with the base plate portion to form the holding portion for sandwiching the bus bar between the base plate portion and the tongue piece. .

  According to this aspect, the leaf spring is formed by folding the tongue piece from the base plate portion, and the holding portion can be formed with a simple configuration. And since the tongue piece is not formed by cutting and raising the central portion of the base plate portion, it is folded from the base plate portion and overlapped with the base plate portion, so that the base plate portion is moved forward in the pressing direction of the tongue piece. The base plate portion can effectively receive the pressing force from the tongue piece. Thereby, a bus bar can be hold | maintained more stably by pinching a bus bar between the overlapping surfaces of a tongue piece and a base board part. Further, since a larger contact area between the base plate portion and the bus bar can be secured, further conduction stability can be secured.

  According to a fifth aspect of the present invention, in the one according to any one of the second to fourth aspects, in the base plate portion, the tongue piece is directed toward one end edge portion of the base plate portion. The bus bar insertion opening is formed by being opened, and protrudes outward from the edge of the base plate located on the side opposite to the opening direction of the tongue piece, Conductive legs that are inserted into the through holes and soldered are integrally formed.

  According to this aspect, by providing the joint fitting with the conductive legs soldered to the printed circuit board, the bus bar circuit structure can be electrically connected to the conductive path of the printed circuit board. Moreover, since the insertion opening of the bus bar is opened toward the upper side of the printed circuit board on the side opposite to the conductive leg part, the conductive bar part of the joint bracket is soldered and fixed to the printed circuit board, and then the bus bar is fixed. It can be inserted into the insertion slot from above the printed circuit board and connected to the joint fitting. Thereby, the assembly of the bus bar circuit structure on the printed circuit board can be easily performed.

  Furthermore, since only the joint fittings need only be soldered to the printed circuit board, the heat radiation area can be reduced as compared with the case where the bus bar is directly soldered to the printed circuit board as in the prior art. Thereby, the conduction | electrical_connection leg part of a joint metal fitting can be heated rapidly to the temperature suitable for soldering, and an appropriate temperature can be maintained. As a result, the joint fitting can be securely soldered to the printed board. In general, the bus bar is often disposed on an insulating plate assembled on a printed circuit board, and during soldering, there may be a problem of solder cracks due to thermal expansion of the insulating plate. For example, since an insulating plate is unnecessary when soldering the joint metal fitting, the problem of solder cracks due to thermal expansion of the insulating plate can also be avoided. Thereby, the bus bar can be more reliably conducted to the conductive path of the printed board through the joint fitting securely soldered to the printed board.

  According to a sixth aspect of the present invention, in the one according to any one of the second to fifth aspects, the base plate portion includes a bent portion that is bent at an intermediate portion in the connecting direction of the two bus bars. It is provided.

  According to this aspect, by forming the bent portion in the base plate portion, it is possible to arbitrarily adjust the extending direction of the two bus bars connected to each other by appropriately adjusting the bent angle of the bent portion. it can. In addition, it is possible to change the mutual position while maintaining the extending direction of the two bus bars by bending in the crank shape at the intermediate portion. Thereby, a complicated circuit form can be easily configured. This embodiment can be suitably used in combination with the third embodiment. That is, by providing a bent portion between the pair of tongue pieces, the bent portion can be easily bent in an arbitrary direction.

  According to a seventh aspect of the present invention, in the one according to any one of the first to sixth aspects, a part of the joint fitting is on a side of the tongue piece on the overlapping surface side of the tongue piece. The locking projection is formed by bending so as to rise.

  According to this aspect, the locking projection can be easily formed integrally with the joint fitting. In addition, since the latching protrusion is formed by standing on the bus bar overlapping surface side, the sandwiching portion is configured by sandwiching the busbar in the plate pressure direction simply by inserting the busbar slit into the latching protrusion. The movement of the bus bar in the sliding direction, which becomes a problem at the time, can be advantageously prevented. The locking projection in this aspect can be preferably formed by bending the end portion of the joint fitting. For example, the engagement projection can be formed by punching the central portion of the joint fitting and bending the central portion. The stop protrusion may be formed by cutting and raising at the center portion of the joint fitting.

  According to the present invention, the two bus bars are connected to each other via the joint fitting. Thereby, excellent versatility can be obtained by connecting a plurality of bus bars with a plurality of joint fittings to form a desired circuit shape. Further, since the shape of the bus bar can be simplified and reduced in size, the yield can be improved. Then, while holding the bus bar between the holding portions and preventing the bus bar from being pulled out by the locking means, it is possible to ensure good electrical conductivity.

The perspective view of the bus-bar circuit structure as 1st embodiment of this invention. The perspective view of the joint metal fitting which comprises the bus-bar circuit structure shown in FIG. The side view of the joint metal fitting shown in FIG. The perspective view of the bus-bar circuit structure as 2nd embodiment of this invention. The perspective view of the bus-bar circuit structure as a different aspect of this invention. The front view of the printed circuit board provided with the bus-bar circuit structure as 3rd embodiment of this invention. The perspective view of the joint metal fitting which comprises the bus-bar circuit structure shown in FIG. The principal part enlarged plan view of the state which removed the bus-bar of the printed circuit board shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIG. 1 shows a bus bar circuit structure 10 as a first embodiment of the present invention. The bus bar circuit structure 10 has a structure in which two bus bars 12 a and 12 b are connected to each other via a joint fitting 14. In addition, although illustration is abbreviate | omitted, the bus-bar circuit structure 10 is mounted and used on an insulating board etc.

  2 and 3 show the joint fitting 14. The joint metal fitting 14 is an integrally formed product formed by press-punching and bending a conductive metal plate made of, for example, iron, copper, brass or the like with a surface plated with tin or the like in a developed shape. It is said that.

  A base plate portion 16 is formed on the joint fitting 14. The base plate portion 16 has a substantially long rectangular flat plate shape, and one surface is a bus bar overlapping surface 17 which is a substantially flat surface. A pair of tongue pieces 20 a and 20 b are formed on one end edge portion 18 a extending in the longitudinal direction of the base plate portion 16. Since these tongue pieces 20a and 20b have the same shape, the tongue piece 20a will be described as an example.

  The tongue piece 20a protrudes from one end edge portion 18a of the base plate portion 16 to the outside (upward in FIG. 3) perpendicular to the longitudinal direction of the base plate portion 16 with a substantially constant width dimension. Is folded toward the overlapping surface 17 and extended toward the other end edge portion 18b, thereby forming a leaf spring integrally formed with the base plate portion 16. The tongue piece 20a includes a spring portion 22 that extends from the end edge portion 18a of the base plate portion 16 and is folded back toward the other end edge portion 18b. An inclined portion 24 extending in an inclined manner in a direction approaching the overlapping surface 17 from the extended end edge portion is integrally formed. A contact portion 28 extending from the extended end edge of the inclined portion 24 toward the other end edge 18 b of the base plate portion 16 and superimposed on the overlapping surface 17 is integrally formed. The abutting portion 28 is opposed to the overlapping surface 17 in a substantially parallel manner with a gap, and the separation distance d between the abutting portion 28 and the overlapping surface 17 in the free state of the tongue piece 20a is the bus bar. It is made slightly smaller than the thickness dimension of 12a, 12b. Further, a tongue piece side guide portion 32 that is gradually separated from the base plate portion 16 as it goes to the extension end portion 30 of the tongue piece 20a is integrally formed at the extended end edge portion of the contact portion 28.

  The tongue piece 20a is opposed to the base plate portion 16 with a gap in the contact portion 28, and the extended end portion 30 of the tongue piece 20a is set as a free end, so that the tongue piece 20a. Is open toward the end edge 18b of the base plate portion 16, and a bus bar that opens toward the end edge 18b is provided between the extended end 30 of the tongue piece 20a and the base plate portion 16. An insertion port 34 is formed. In addition, a base side guide portion 36 that protrudes outward with a width dimension substantially equal to insertion portions 46 and 46 of bus bars 12a and 12b, which will be described later, is integrally formed on the end edge portion 18b of the base plate portion 16. The side guide portion 36 is gradually separated from the tongue piece 20a in the protruding direction from the end edge portion 18b. Further, as is apparent from FIG. 3, the tongue piece side guide portion 32 is positioned opposite to the end edge portion 18b of the base plate portion 16, so that the base side guide portion 36 protruding from the end edge portion 18b is The bus bar insertion port 34 is positioned in front of the tongue piece side guide portion 32 in the opening direction (downward in FIG. 3). The bus bar insertion slot 34 is widened by the tongue piece side guide portion 32 and the base side guide portion 36 so that the bus bars 12a and 12b can be easily inserted.

  Such tongue pieces 20a and tongue pieces 20b are located at both ends in the longitudinal direction of the base plate portion 16 and are spaced apart from each other by a predetermined distance in the longitudinal direction of the base plate portion 16 so as to be independent of each other. It is integrally formed with the part 16. Further, a sandwiching portion 37 is formed by the tongue pieces 20 a and 20 b and the base plate portion 16.

  Further, locking projections 38a and 38b are integrally formed on both end edges 18c and 18d in the longitudinal direction of the base plate portion 16 positioned on the sides of the tongue pieces 20a and 20b, respectively. The locking protrusions 38a and 38b are formed by projecting pieces in which the end edge 18a side of the end edges 18c and 18d of the base plate portion 16 is partially protruded outward in the longitudinal direction of the base plate portion 16. By being bent and raised to the surface 17 side, the end edge portions 18c and 18d of the base plate portion 16 are integrally formed so as to protrude from the overlapping surface 17 on the end edge portion 18a side. In addition, as shown in FIG. 3, the protrusion dimension from the overlapping surface 17 of the latching protrusions 38a and 38b is larger than the separation dimension from the overlapping surface 17 of the contact portions 28 and 28 in the tongue pieces 20a and 20b. And it is made smaller than the separation dimension of the maximum separation position (in this embodiment, the connection part of the spring part 22 and the inclination part 24) from the overlapping surface 17 in the tongue pieces 20a and 20b.

  As shown in FIG. 1, the two bus bars 12a and 12b are connected to each other through the joint fitting 14 having such a structure. Since the bus bars 12a and 12b have substantially the same structure, the bus bar 12a will be described as an example.

  The bus bar 12a is a so-called flat bus bar known in the art, and is formed by stamping a conductive metal plate such as iron, copper, brass or the like, which has a surface plated with tin, into a desired circuit shape. Has been. In addition, although illustration is abbreviate | omitted, in the bus-bar 12a, the connection tab connected with an electrical component is erected by bending etc. as needed.

  A connection portion 42 is formed integrally with the connection side end portion 40 of the bus bar 12a. The connection portion 42 is a protrusion formed by raising a protrusion that protrudes perpendicular to the circuit extending direction of the bus bar 12a. The connecting portion 42 is formed with a slit 44 that extends in the protruding direction from the bus bar 12a and opens at the protruding tip edge portion. The connecting portion 42 is inserted into the joint fitting 14 from the slit 44 to the connecting side end portion 40 side. Part 46. The groove width dimension of the slit 44 is slightly larger than the thickness dimension of the locking projections 38a and 38b in the joint fitting 14. Further, in order to facilitate the insertion of the insertion portion 46 into the holding portion 37, it is preferable that the protruding tip portion from the bus bar 12a has a tapered shape.

  And these bus-bars 12a and 12b are arrange | positioned linearly in the state which faced the connection side edge parts 40 and 40, and the joint metal fitting 14 is assembled | attached to the connection parts 42 and 42 of bus-bar 12a, 12b. When the joint fitting 14 is assembled, the insertion portion 46 of the bus bar 12a is inserted between the abutting portion 28 of the tongue piece 20a and the overlapping surface 17 of the base plate portion 16 while expanding the tongue piece 20a from the insertion opening 34. Is done. When the insertion portions 46 and 46 are inserted, the locking projections 38a and 38b of the joint fitting 14 are inserted into the slits 44 and 44, and the locking projections 38a and 38b are guided by the slits 44 and 44, so that the joint The metal fitting 14 can be easily guided in the assembling direction, and the insertion amounts of the insertion portions 46 and 46 can be defined by the locking projections 38a and 38b coming into contact with the opening base end portions of the slits 44 and 44.

  Then, the contact portion 28 is biased toward the overlapping surface 17 by the elastic restoring force of the tongue piece 20 a, whereby the insertion portion 46 superimposed on the overlapping surface 17 is pressed against the overlapping surface 17. As a result, the insertion portion 46 is sandwiched between the contact portion 28 and the overlapping surface 17 from both sides in the thickness direction, and the joint fitting 14 is assembled to the bus bar 12a. Similarly, the insertion portion 46 of the bus bar 12b is inserted between the contact portion 28 of the tongue piece 20b and the base plate portion 16 and is sandwiched between the contact portion 28 and the overlapping surface 17 from both sides in the plate thickness direction. Thus, the joint fitting 14 is assembled to the bus bar 12b. Thus, the joint metal fitting 14 is assembled | attached between the connection side edge parts 40 and 40 of bus-bar 12a, 12b. As a result, the bus bars 12a and 12b are connected to each other through the joint fitting 14 and are connected to each other, thereby forming a bus bar circuit 48 as a conductive path.

  According to the bus bar circuit structure 10 having such a structure, the bus bars 12a and 12b can be connected by the joint fitting 14 to be conductive. Thus, a bus bar circuit 48 having an arbitrary shape can be formed by preparing a plurality of bus bars and connecting them with a plurality of joint fittings 14. For example, a larger bus bar circuit 48 is formed by forming a connection portion 42 at an end portion of the bus bar 12a opposite to the connection side end portion 40 and connecting it to another bus bar with the joint fitting 14. The bus bars 12a and 12b and the joint fitting 14 are formed separately from each other, thereby simplifying the shape of the bus bars 12a and 12b and reducing the size. Thereby, the yield can be improved and the manufacturing cost can be reduced.

  In particular, the assembly of the bus bars 12a, 12b and the joint fitting 14 is extremely simple in that the insertion portions 46, 46 of the bus bars 12a, 12b are inserted between the tongue pieces 20a, 20b, which are leaf springs, and the base plate portion 16. It can be done with simple operation. The tongue pieces 20a and 20b are brought into contact with the insertion portions 46 and 46 over the entire width, and the insertion portions 46 and 46 are brought into contact with the overlapping surface 17 over the entire width. The state can also be stably maintained, and conduction stability can be ensured. Furthermore, since the tongue pieces 20a and 20b and the overlapping surface 17 are opposed to each other in the pressing direction of the tongue pieces 20a and 20b across the insertion portions 46 and 46, the pressing force of the tongue pieces 20a and 20b is applied to the overlapping surface. 17 can be effectively supported, and the insertion portions 46 and 46 can be stably held. Further, since the tongue pieces 20a and 20b are formed independently of each other so as to correspond to the bus bars 12a and 12b, the bus bars 12a and 12b can be stably held.

  Further, the locking projections 38a and 38b of the joint fitting 14 are inserted into the slits 44 and 44 of the bus bars 12a and 12b. Thereby, when the bus bars 12a and 12b sandwiched between the holding portions 37 try to slide in a direction orthogonal to the facing direction of the contact portion 28 and the overlapping surface 17, the connection portions 42 and 42 are engaged. The bus bars 12a and 12b can be prevented from sliding by being locked by the stop protrusions 38a and 38b, and the bus bars 12a and 12b can be prevented from coming off from the joint fitting 14. As a result, the conduction state between the bus bars 12a and 12b and the joint fitting 14 can be more stably maintained. Thus, in this embodiment, the latching means is comprised including the latching protrusions 38a and 38b and the slits 44 and 44.

  Next, FIG. 4 shows a bus bar circuit structure 50 as a second embodiment of the present invention. In the following description, members and parts having the same structure as in the first embodiment are given the same reference numerals as those in the first embodiment in the drawing, and the description will be appropriately described. Omitted.

  The joint fitting 52 in the present embodiment has a structure substantially similar to that of the first joint fitting 14. In the base plate portion 16 of the joint fitting 52, a bent portion 54 that is bent at a substantially right angle is formed at an intermediate portion between the tongue piece 20a and the tongue piece 20b in the longitudinal direction that is the connecting direction of the bus bars 12a and 12b. Thereby, the base board part 16 in this embodiment is made into the substantially L shape in the top view.

  According to such a bus bar circuit structure 50, the bus bars 12a and 12b arranged in an L shape can be connected to each other by the joint metal fitting 52 to be conductive. Thereby, a bus bar circuit bent in an L shape can be formed. In particular, since the tongue pieces 20a and 20b are provided independently of each other, a space for forming the bent portion 54 can be advantageously secured between the tongue pieces 20a and 20b, and the degree of freedom of bending of the bent portion 54 can be ensured. Can be secured more effectively.

  The bent shape of the bent portion 54 can be set as appropriate according to the desired routing shape of the bus bar circuit 48, and can thereby cope with a more complicated routing shape. For example, FIG. 5 shows a bus bar circuit structure 60 as a different aspect of the present embodiment. The base plate portion 16 of the joint fitting 62 in this aspect is bent into a U-shape at the bent portion 64. In this way, the bus bars 12a, 12b arranged in parallel can be connected to each other to be conductive, and a bus bar circuit 48 folded back in a U-shape can be formed. The bent portions 54 and 64 may be formed by bending the base plate portion 16 into a curved shape. For example, the bent portion 54 may have an arc shape with a ¼ circumference as viewed from above, or the bent portion 64 may be viewed from above. It is good also as a semicircular arc shape of 1/2 circle.

  In addition, by bending the bent portion in a crank shape, the positions of the pair of bus bars can be kept different from each other while maintaining the extending direction of the pair of bus bars. Furthermore, the bending angle of the base plate portion in the bending portion is not limited to 90 °, and any angle can be adopted according to the required circuit arrangement shape.

  Next, FIG. 6 shows a printed circuit board 72 provided with a bus bar circuit structure 70 as a third embodiment of the present invention. In the bus bar circuit structure 70 according to the present embodiment, the bus bars 12a and 12b are connected and connected through the joint metal fitting 74, and the joint metal fitting 74 is soldered to the printed circuit board 72. It is electrically connected to a formed printed circuit (not shown).

  FIG. 7 shows the joint fitting 74. The joint metal fitting 74 has a structure in which conductive legs 76a to 76c projecting in the direction opposite to the opening direction of the insertion opening 34 of the tongue pieces 20a and 20b are integrally formed with the joint metal fitting 14 in the first embodiment. It is said that.

  The support protrusions 38a and 38b of the joint metal fitting 74 extend outward from the end edge 18b located on the side opposite to the opening direction of the insertion opening 34 of the tongue pieces 20a and 20b on the base plate portion 16. 78a and 78b are integrally formed continuously from the locking projections 38a and 38b. And the conduction | electrical_connection leg part 76a, 76b extended further outward from the protrusion edge part from the latching protrusion 38a, 38b in the support leg part 78a, 78b is integrally formed. The cross-sectional areas of the conductive legs 76a and 76b are smaller than the cross-sectional areas of the support legs 78a and 78b, and the connecting portions between the conductive legs 76a and 76b and the support legs 78a and 78b have stepped surfaces 80a and 80b. 80b is formed.

  Further, in the end edge portion 18b of the base plate portion 16, a support leg portion 78c that protrudes in the same direction as the support leg portions 78a and 78b is integrally formed at the central portion in the longitudinal direction located between the tongue pieces 20a and 20b. Has been. The support leg 78c has a substantially rectangular plate shape protruding from the end edge 18b. Further, the conduction leg 76c is integrally formed so as to protrude further outward from the central portion in the width direction at the protruding end edge of the support leg 78c. As a result, stepped surfaces 80c and 80c are formed at the connecting portion between the conductive leg portion 76c and the support leg portion 78c on both sides of the conductive leg portion 76c. In the joint fitting 74 in the present embodiment, the base plate portion 16 has a flat plate shape. However, as with the joint fittings 52 and 62, the bent portion has a bent portion depending on the required routing shape of the bus bar circuit. Of course, it can be formed.

  The joint metal fitting 74 having such a structure is formed by inserting conductive legs 76a, 76b, and 76c into through holes 83, 83, and 83 penetrating the printed circuit board 72 and soldering them. 72, and is connected to a printed circuit (not shown) provided on the printed circuit board 72. The insertion amount of the conductive legs 76a, 76b, and 76c can be accurately defined by bringing each of the step surfaces 80a to 80c into contact with the surface of the printed circuit board 72.

  An insulating plate 84 is laminated on the printed circuit board 72. The insulating plate 84 has a plate shape made of non-conductive synthetic resin, and a bus bar mounting surface 86 is formed on the side opposite to the printed board 72. As shown in FIG. 8, a bus bar insertion hole 88 is provided in the insulating plate 84. The bus bar insertion hole 88 has a substantially slit shape through which the connection part 42 of the bus bar 12a and the connection part 42 of the bus bar 12b can be inserted. An opening 90 having a partially enlarged groove width is formed in the bus bar insertion hole 88, and the opening 90 is positioned above the joint fitting 74 (upward in FIG. 6). The insertion holes 34 of the metal fitting 74 are opened on the bus bar mounting surface 86 through the opening 90.

  Although not apparent from the drawings, preferably, the tip edge portion of the base side guide portion 36 of the joint fitting 74 slightly protrudes on the bus bar mounting surface 86 through the opening 90, and the tongue piece side guide portion. 32 leading edge portions are positioned within the thickness of the insulating plate 14 within the opening 90. If it does in this way, the connection parts 42 and 42 of bus-bar 12a, 12b can be guided by the base side guide part 36 and the tongue piece side guide part 32, and can be easily inserted in the insertion port 34,34. The bus bar insertion hole 88 in this embodiment is a single hole into which the connecting portions 42 and 42 of both bus bars 12a and 12b can be inserted, but each bus bar 12a and 12b corresponds to each bus bar 12a and 12b. It may be formed.

  Then, the bus bars 12 a and 12 b are mounted on the bus bar mounting surface 86 of the insulating plate 84. In the bus bar 12 a shown in FIG. 6, a connection tab 92 that is connected to an electrical component such as a connector is formed at the end opposite to the connection portion 42 so as to protrude in the direction opposite to the connection portion 42. The bus bars 12 a and 12 b are mounted on the bus bar mounting surface 86 in a state where the connection portions 42 and 42 are inserted into the bus bar insertion holes 88 and the insertion portions 46 and 46 are assembled to the joint metal fitting 74. As a result, the bus bar circuit structure 70 is configured by connecting the bus bars 12a and 12b to each other by the joint metal fittings 74 and making them conductive. Further, since the joint fitting 74 is electrically connected to the printed circuit of the printed circuit board 72, the bus bars 12a and 12b are also electrically connected to the printed circuit of the printed circuit board 72 via the joint metal fitting 74.

  According to the bus bar circuit structure 70 having such a structure, the bus bars 12 a and 12 b can be electrically connected to the printed circuit by soldering the joint metal fitting 74 to the printed circuit board 72. The insertion holes 34 and 34 in the joint metal fitting 74 are opened upward (in FIG. 6, in the upper direction) of the printed circuit board 72. Therefore, after the joint metal fitting 74 is soldered to the printed circuit board 72, the bus bar 12a. 12b can be easily assembled from above the printed circuit board 72.

  Further, when the insertion portions 46 and 46 of the bus bars 12a and 12b are inserted into the sandwiching portion 37 of the joint metal fitting 74, the stepped surfaces 80a to 80c are brought into contact with the printed circuit board 72, so that the sandwiching portion 37 is stably provided. I can support it. Further, since the sandwiching portion 37 is supported at three points by the conductive legs 76a to 76c, the sandwiching portion 37 can be supported more stably when the bus bars 12a and 12b are inserted and removed. In particular, in the present embodiment, the conductive legs 76a and 76b are positioned on the support leg portions 78a and 78b on the protruding tip side from the overlapping surface 17, respectively, and the conductive legs 76a to 76c can be separated from each other. By securing as much as possible, more stable three-point support is realized. Then, by stably supporting the holding portion 37, the bus bars 12a and 12b and the joint fitting 74 can be connected more stably and reliably.

  Furthermore, since the joint metal fitting 74 having a relatively small heat radiation area is soldered to the printed circuit board 72, the conduction legs 76a to 76c are promptly heated to a temperature suitable for soldering, and the appropriate temperature is stably maintained. I can do it. Further, since the insulating plate 74 and the bus bars 12a and 12b may be assembled after the joint metal fitting 74 is soldered to the printed circuit board 72, there is a risk of solder cracks due to the thermal expansion of the insulating plate 74 with respect to the heat of soldering. It can be avoided. Thereby, the conduction | electrical_connection leg part 76a-76c can be reliably soldered to the printed circuit board 72, and conduction | electrical_connection reliability can be ensured.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the specific shape of the joint fitting is not limited to that of the above embodiment, and the tongue pieces 20a and 20b are formed by cutting and raising the central portion of the base plate portion 16, and the bus bar 12a, 12b may be held not between the opposing surfaces of the tongue pieces 20a and 20b and the overlapping surface 17 but between the tongue pieces 20a and 20b and the overlapping surfaces 17 located on both sides thereof. Further, without forming the tongue pieces 20a and 20b independently from each other, only one tongue piece may be formed on the base plate portion 16, and both the bus bars 12a and 12b may be sandwiched by the one piece tongue piece. .

  Further, the locking projections 38a and 38b in the above embodiment are bent at both end edges in the longitudinal direction of the base plate portion 16, so that the central portion of the base plate portion 16 is cut and raised. Thus, the number of press punched portions has been reduced so that it can be easily formed. However, the formation position of the locking projection is not necessarily limited to the outermost peripheral edge portion of the joint fitting. For example, it is possible to cut and raise a locking projection on the central portion of the base plate portion 16 by punching and bending the central portion of the base plate portion 16.

  Furthermore, the bus bars 12a and 12b in the above embodiment are so-called flat bus bars. However, for example, a slit may be formed at the end of a so-called vertical bus bar so that it can be connected to a joint fitting. A flat bus bar may be connected to one of the metal fittings, and a vertical bus bar may be connected to the other.

10, 50, 60, 70: Bus bar circuit structure, 12a, b: Bus bar, 14, 52, 62, 74: Joint metal fitting, 16: Base plate part, 17: Overlapping surface, 18a to d: End edge part, 20a, b: tongue, 34: insertion slot, 37: holding part, 38a, b: locking projection (locking means), 40: connection side end, 44: slit (locking means), 48: Bus bar circuit (conductive path), 54, 64: bent portion, 72: printed circuit board, 76a to c: conductive leg portion, 83: through hole

Claims (7)

Two bus bars connected to each other to form a conductive path;
A joint fitting assembled between the connection side ends of the two bus bars and conducting the two bus bars; and
In the joint bracket, a sandwiching portion for sandwiching the two bus bars in the thickness direction is formed, and
Locking means for preventing the bus bar from coming out of the joint metal fitting is provided by inserting an engaging projection formed on the joint metal fitting into the slit formed in each of the two bus bars. A featured busbar circuit structure.   In the joint fitting, a base plate portion on which the bus bar is overlaid and a tongue piece for pressing the bus bar against the base plate portion are integrally formed, and the clamping is performed between the base plate portion and the tongue piece. The bus bar circuit structure according to claim 1, wherein the portion is configured.   In the joint fitting, the tongue piece that presses one of the bus bars against the base plate portion and the tongue piece that presses the other bus bar against the base plate portion are formed independently of each other. The bus bar circuit structure described.   In the joint fitting, the tongue piece is integrally formed extending from an end edge portion of the base plate portion on which the bus bar is overlapped, and the tongue piece is folded back and overlapped with the base plate portion. 4. The bus bar circuit structure according to claim 2, wherein the holding portion for holding the bus bar is formed between the base plate portion and the tongue piece. 5.   In the base plate portion, the tongue piece is opened toward one end edge portion of the base plate portion to form an insertion port for the bus bar, and on the side opposite to the opening direction of the tongue piece. 5. A conductive leg that protrudes outward from an edge of the base plate located at a position and is soldered by being inserted into a through hole of a printed circuit board. 2. A bus bar circuit structure according to item 1.   The bus bar circuit structure according to any one of claims 2 to 5, wherein the base plate portion is provided with a bent portion that is bent at an intermediate portion in a connecting direction of the two bus bars.   A part of said joint metal fitting is bent so that it may stand up to the superposition surface side of said bus bar in the side position of said tongue piece, and the above-mentioned locking projection is formed in any 1 paragraph of Claims 1-6. The bus bar circuit structure described.

Images