JP2014110159A - Structure for fixing connection terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for fastening a connection terminal on a wiring board, which is capable of stopping rotation of the connection terminal, reduces the number of steps, the number of components, and the size of the components, and can be easily designed without restrictions on the thickness of the board of the connection terminal or the like.SOLUTION: According to the present embodiment, there is provided a structure for fastening a wiring board and a connection terminal provided on the wiring board with a screw. In this structure, a projecting portion projecting toward the wiring board side is provided in a fixing member arranged on a back side of the wiring board, and a projecting portion insertion hole, into which a tip portion of the projecting portion is inserted, is provided in each of the wiring board and the connection terminal.

Description

  Embodiments described herein relate generally to a connection terminal fixing structure.

  A first conventional example of a structure in which a wiring board and connection terminals arranged on the wiring board are fastened and fixed with screws will be described with reference to FIGS. 4 and 5. FIG. The wiring board 51 is a printed wiring board, for example, and is provided with a wiring pattern (not shown). Fixing screw insertion holes 52 are formed at the four corners of the wiring board 51. The wiring board 51 has screws 53 (see FIG. 5) inserted into the respective fixing screw insertion holes 52, and a boss portion 55 (only one is shown in FIG. 4) provided on the board chassis 54 that houses and arranges the wiring board 51. ) To be fixed in the board chassis 54 (see FIG. 5).

  In this case, three connection terminals 56 are arranged on the wiring board 51. The connection terminal 56 is a copper bar for large current, for example. Each connection terminal 56 has a crank shape (substantially Z shape) in this case, two screw insertion holes 57 are formed in one end portion 56a, and two attachment holes 58 are also formed in the other end portion 56b. ing. A total of six screw insertion holes 59 are formed in the wiring board 51, corresponding to the screw insertion holes 57 of the connection terminals 56. The board chassis 54 located on the back side of the wiring board 51 is provided with two boss portions 60 corresponding to the screw insertion holes 57 of the connection terminals 56, for a total of six. A nut 61 having a mounting hole 61a is provided in a fixed state at the upper part in each boss portion 60.

  And each connection terminal 56 inserts the front-end | tip part of the two screws 62 in the screw insertion hole 57 of the said connection terminal 56, and the screw insertion hole 59 of the wiring board 51, respectively, and the attachment hole 61a of the corresponding boss | hub part 60 is shown. By being screwed into the wiring board 51, the wiring board 51 is fastened and fixed (see FIG. 5). As a result, one end portion 56 a of each connection terminal 56 comes into contact with a wiring pattern (not shown) provided on the wiring substrate 51. In this case, the fastening of the connection terminal 56 onto the wiring board 51 may be originally performed by screwing at one place, but the screwing at two places can surely prevent the connection terminal 56 from rotating. it can.

  6 and 7 show a second conventional example. This device differs from the first conventional example in the following points. That is, only one screw insertion hole 57 is provided at one end portion 56a of each connection terminal 56, and an engagement convex portion 63 protruding toward the wiring board 51 is bent at the tip end of the one end portion 56a. It is provided integrally. The engaging convex portion 63 is formed to have a thickness that can be inserted into the insertion hole 64 provided in the wiring board 51 and the mounting hole 61 a of the corresponding boss portion 60. In this case, each connection terminal 56 has a distal end portion of one screw 62 in a state where the distal end portion of the engaging convex portion 63 is inserted into the insertion hole 64 of the wiring board 51 and the mounting hole 61a of the corresponding boss portion 60. Is inserted into the screw insertion hole 57 of the connection terminal 56 and the screw insertion hole 59 of the wiring board 51 and screwed into the mounting hole 61a of the corresponding boss portion 60, thereby being fastened and fixed on the wiring board 51 (FIG. 7). reference). This also prevents the connection terminal 56 from rotating.

JP 2000-285999 A JP 11-354946 A

  In the case of the first conventional example described above, two screwing is required for one connection terminal 56, so that the screws 62 need to be temporarily tightened and the number of screws 62 is increased. Further, the one end portion 56 a of the connection terminal 56 requires an area for arranging the heads of the screws 62 at two locations.

  On the other hand, in the case of the second conventional example, since there is only one screwing location for one connection terminal 56, it is not necessary to temporarily tighten the screw 62, and the work man-hour can be reduced and the parts can be reduced. The score can also be reduced. However, the engaging protrusions 63 provided on the connection terminals 56 need to correspond to the size of the mounting holes 61a of the corresponding bosses 60, but there are restrictions due to the plate thickness of the connection terminals 56 and the design is difficult. There is.

  Therefore, when tightening and fixing the connection terminal on the wiring board, the connection terminal can be prevented from rotating, the work man-hours, the number of parts, the part size can be reduced, and the thickness of the connection terminal is not restricted. A connection terminal fixing structure that can be easily designed is provided.

  In the present embodiment, in a structure in which a wiring board and a connection terminal arranged on the wiring board are fastened and fixed by screws, a protrusion projecting toward the wiring board is provided on a fixing member arranged on the back side of the wiring board. The wiring board and the connection terminal are each provided with a protrusion insertion hole into which the tip of the protrusion is inserted.

An exploded perspective view showing a schematic configuration of the present embodiment Perspective view with assembly completed FIG. 2 is a longitudinal sectional view of the main part in the state of FIG. FIG. 1 equivalent view showing a first conventional example 2 equivalent diagram FIG. 1 equivalent view showing a second conventional example 2 equivalent diagram

  Hereinafter, an embodiment will be described with reference to FIGS. The wiring board 1 is also a printed wiring board in this case, and has a rectangular plate shape. The wiring board 1 is also provided with a wiring pattern (not shown). Fixing screw insertion holes 2 are formed at the four corners of the wiring board 1. The wiring board 1 has screws 3 (see FIG. 2) inserted into the respective fixing screw insertion holes 2 and boss portions 5 (only one is shown in FIG. 1) provided on the board chassis 4 in which the wiring board 1 is accommodated. ) To be fixed in the board chassis 4 (see FIG. 2). In this case, the board chassis 4 is made of synthetic resin and functions as a fixing member disposed on the back side of the wiring board 1.

  In this case, three connection terminals 6 are also arranged on the wiring board 1. The connection terminal 6 is a copper bar for large current, for example. Each connection terminal 6 has a crank shape (substantially Z shape) in this case, and one circular screw insertion hole 7 and one circular protrusion insertion hole 8 are formed at one end 6a. The protrusion insertion hole 8 is formed in a circular shape slightly smaller than the screw insertion hole 7. Two circular attachment holes 9 are formed in the other end portion 6 b of the connection terminal 6. The wiring board 1 is formed with three circular screw insertion holes 10 corresponding to the screw insertion holes 7 of the connection terminals 6 in total, and is formed in the protrusion insertion holes 8 of the connection terminals 6. Correspondingly, a total of three circular protrusion insertion holes 11 are formed one by one.

  The board chassis 4 located on the back side of the wiring board 1 is provided with three boss portions 12 corresponding to the screw insertion holes 7 of the connection terminals 6 in total, and the protrusions of the connection terminals 6. A total of three protrusions 13 each having a columnar shape are provided corresponding to the part insertion holes 8. A nut 14 having a mounting hole 14 a is provided in a fixed state at the upper part in each boss portion 12. Each protrusion 13 is disposed in the vicinity of the boss portion 12. Each of the boss 12 and the protrusion 13 protrudes upward in FIG. 1 on the wiring board 1 side. Each protrusion 13 is set to a thickness that can be inserted into the corresponding protrusion insertion holes 11 and 8 and is set higher than the boss 12 (see FIG. 3).

  2 and 3, the tip of each protrusion 13 is inserted from below into the protrusion insertion hole 11 of the wiring board 1 and the corresponding protrusion insertion hole 8 of the connection terminal 6. And each connection terminal 6 inserts the front-end | tip part of the screw 15 into the screw insertion hole 7 of the connection terminal 6 and the screw insertion hole 10 of the wiring board 1 from the upper direction, and screwed in the attachment hole 14a of the corresponding boss | hub part 12. Thus, the wiring board 1 is fastened and fixed. In this state, the lower surface of the one end portion 6 a of each connection terminal 6 comes into contact with a wiring pattern (not shown) on the upper surface of the wiring substrate 1. A terminal block or another wiring board is connected to the other end 6 b of the connection terminal 6.

  Here, an assembly procedure when the connection terminal 6 is fastened and fixed onto the wiring board 1 will be described. First, the wiring board 1 is arranged in the board chassis 4 so that the tip ends of the respective protrusions 13 are inserted into the three protrusion insertion holes 11 of the wiring board 1. Thereby, the wiring board 1 is positioned with respect to the board chassis 4, and the screw insertion holes 2 at the four corners of the wiring board 1 correspond to the mounting holes 5 a of the corresponding boss parts 5. At this time, the tip of each protrusion 13 protrudes slightly upward from the screw insertion hole 11 of the wiring board 1. In this state, the tip of the screw 3 (see FIG. 2) inserted into each screw insertion hole 2 is screwed into the mounting hole 5a. Thereby, the wiring board 1 is fixed in the board chassis 4.

  Thereafter, each connection terminal 6 is arranged on the wiring board 1 so that the tip of the corresponding protrusion 13 is inserted into the protrusion insertion hole 8 of the connection terminal 6. Then, the tip end portion of the screw 15 for fixing the connection terminal 6 is inserted into the screw insertion hole 7 of the connection terminal 6 and the screw insertion hole 10 of the wiring board 1 from above, and is screwed into the mounting hole 14a of the corresponding boss portion 12. To. In this way, each connection terminal 6 is fastened and fixed on the wiring board 1.

  According to the above-described embodiment, the following operational effects can be obtained. Although there is only one screwing location for each connection terminal 6, the tip end portion of the projection 13 protruding from the board chassis 4 is inserted into the projection insertion hole 8 of the connection terminal 6. Can be reliably prevented. In this case, since there is only one screwing location for each connection terminal 6, unlike the case where there are two screwing locations for one connection terminal (first conventional example), the temporary connection of the screw 15 is not possible. There is no need for tightening, and accordingly, the number of assembling steps can be reduced, and the number of screws 15 can be reduced.

  In addition, in the one end portion 6a of each connection terminal 6, since there is only one place where the head portion of the screw 15 is disposed, the area of the portion where the protrusion insertion hole 8 is formed is required. The required area of the one end portion 6a of the connection terminal 6 can be reduced as compared with the case of the conventional example, and the area of the wiring pattern on the corresponding wiring board 1 and consequently the area of the wiring board 1 can be reduced. Is possible.

  Further, the size (diameter dimension) of the projection insertion hole 8 formed in the connection terminal 6 and the thickness dimension of the projection 13 inserted into the projection insertion hole 8 are restricted by the plate thickness of the connection terminal 6 and the like. Since it can set freely without receiving, design can be performed easily.

  When the wiring board 1 is arranged in the board chassis 4, the protrusion 13 on the board chassis 4 side is inserted into the protrusion insertion hole 11 of the wiring board 1, so that the wiring board 1 is placed on the board chassis 4 as described above. Positioning is possible. For this reason, when the screw 3 for fixing the wiring board 1 to the board chassis 4 is tightened, the number of steps for temporarily tightening the screw 3 becomes unnecessary, and this also makes it possible to reduce the number of work steps. In this case, in particular, since there are a plurality of (three) protrusions 13, the wiring board 1 can be positioned more reliably. The protrusion insertion hole 11 of the wiring board 1 and the protrusion 13 inserted into the protrusion insertion hole 11 function as positioning means for the wiring board 1.

(Other embodiments)
The connection terminal 6 is not limited to copper and may be made of aluminum or iron.
The protrusion 13 is not limited to a cylinder, and may be a triangular prism or a quadrangular prism. In this case, it is preferable that the shape of the protrusion insertion hole 11 of the wiring substrate 1 and the protrusion insertion hole 8 of the connection terminal 6 is a shape that matches the cross-sectional shape of the protrusion 13.
The fixing member is not limited to the board chassis 4 and may be a member provided in a fixed state on the back side of the wiring board 1.

  As described above, according to the connection terminal fixing structure of the present embodiment, there is only one screwing location of each connection terminal, but the tip of the projection protruding from the fixing member is the projection of the connection terminal. Since it is inserted into the part insertion hole, it is possible to reliably prevent the connection terminal from rotating. Since there is only one screwing location for each connection terminal, there is no need for temporary tightening of screws, unlike the case of two screwing locations for one connection terminal. The number of screws can be reduced. In addition, in each connection terminal, since there is only one place where the screw head is disposed, the area of the portion where the protrusion insertion hole is formed is required, but than in the case of the first conventional example, It is possible to reduce the area required for fixing at the connection terminal, and it is possible to reduce the area of the wiring pattern on the corresponding wiring board, and hence the area of the wiring board. The size of the protrusion insertion hole formed in the connection terminal and the thickness dimension of the protrusion inserted into the protrusion insertion hole can be freely set without being restricted by the thickness of the connection terminal. Can be designed easily.

  Although one embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 1 is a wiring board, 4 is a board chassis (fixing member), 6 is a connection terminal, 7 is a screw insertion hole, 8 is a protrusion insertion hole, 10 is a screw insertion hole, 11 is a protrusion insertion hole, 12 is Boss part, 13 is a protrusion, 15 shows a screw.

Claims (2)

In the structure that fastens and fixes the wiring board and the connection terminals arranged on the wiring board with screws,
The fixing member disposed on the back side of the wiring board is provided with a protrusion that protrudes toward the wiring board, and the wiring board and the connection terminal are each provided with a protrusion insertion hole into which the tip of the protrusion is inserted. A connection terminal fixing structure characterized by that.   2. The connection terminal fixing structure according to claim 1, wherein the protrusion insertion hole of the wiring board and the protrusion inserted into the protrusion insertion hole function as positioning means for the wiring board.

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