JP5685997B2 - Circuit board for electrical junction box - Google Patents

Description

  The present invention relates to a circuit board for an electrical junction box that forms an internal circuit of the electrical junction box, and more particularly to a circuit board for an electrical junction box in which a terminal for connection to an external circuit is connected to an electric wire. It is.

  2. Description of the Related Art Conventionally, an electrical connection box such as a junction box mounted on an automobile or the like is known in which a circuit board composed of an electric wire and a terminal pressed against the electric wire is accommodated. For example, those described in Japanese Patent Application Laid-Open No. 2005-51877 (Patent Document 1) and Japanese Patent Application Laid-Open No. Hei 6-295575 (Patent Document 2). In these electrical connection boxes, electric wires are wired on the insulating plate, and terminals are accommodated in a terminal accommodating portion provided on the insulating plate. As a result, the terminal is protruded on the insulating plate in a state where the press-contact portion of the terminal is pressed against the electric wire and the terminal and the conductor of the electric wire are connected. Then, the upper case or the like is placed on the insulating plate, so that the terminals protruding on the insulating plate are disposed in the component mounting portions such as the connector hood and the fuse cavity formed on the upper case. Thus, the internal circuit of the electrical junction box is constituted by the circuit board including the wires wired on the insulating plate and the terminals press-contacted thereto, and electrical components such as connectors and fuses are mounted on the component mounting portion. Thus, it is connected to an internal electric wire via a terminal disposed in the component mounting portion.

  By the way, the electric wire wired by the insulating board is press-fitted and connected to the press-contact part of the terminal. Therefore, if the wire is pulled due to the restoring force or external force of the wire laid on the insulating plate, the connection force between the terminal and the wire may be pulled and the connection reliability may be reduced. . In particular, as described in Patent Document 2, in the case where the insulating plate is small and the electric wire is extended to the outside from the insulating plate, the electric wire is greatly displaced when the electric connection box is assembled. It was easy for a large tensile force to be exerted on the connecting portion between the wire and the electric wire.

  In order to cope with such a problem, Patent Document 2 discloses a tensile force applied to a connection portion with a terminal by providing a pinching portion of an electric wire in an insulating plate and press-fitting the electric wire into the pinching portion. It has been proposed to reduce communication. However, in such a structure, sufficient holding force cannot be exerted for displacement in the lifting direction from the insulating plate, which is opposite to the press-fitting direction to the clamping part, and tensile force to the connection part with the terminal It was still insufficient to prevent the transmission of

JP 2005-51877 A JP-A-6-295552

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is to reduce the transmission of the tensile force to the connection portion between the terminal and the electric wire to constitute the internal circuit of the electric connection box. It is an object of the present invention to provide a circuit board for an electric junction box having a novel structure.

According to a first aspect of the present invention, an electric wire is wired on an insulating plate, the electric wire is disposed on a terminal mounting portion provided on the insulating plate, and a terminal is mounted on the terminal mounting portion. As a result, in the circuit board for an electrical junction box in which the pressure contact portion of the terminal is connected to the conductor of the electric wire and protrudes on the insulating plate, the synthetic resin cover member is formed on the insulating plate . The electrical component mounting part is assembled and the terminal projecting on the insulating plate is disposed in the electrical component mounting part , while the insulating plate and the electrical component mounting part are connected to the terminal. A set of press-fit fixing portions for press-fitting and fixing the electric wires at different positions in the length direction are provided, and the press-fit fixing portion of the insulating plate and the press-fit fixing portion of the electric component mounting portion are respectively insulated from each other. On the other side of the plate and the electrical component mounting part Only and it is slit-shaped recess which opens, that said wire is adapted to be sandwiched between the bottom surface of the recess in the bottom surface and the electrical component mounting section of the recess in the insulating plate Is a feature.

According to the present invention, the electric wire connected to the terminal can be fixed by both the press-fit fixing portion of the insulating plate and the press-fit fixing portion of the electric component mounting portion . Thereby, movement of an electric wire can be suppressed more effectively and transmission of tensile force to a connection part with a terminal can be prevented. As a result, the connection reliability between the terminal and the electric wire can be improved.

As the EC mounting unit, it may be a tree butter member that having a mounting portion of the electrical components such as connectors and fuses.

According to the first aspect of the present invention, the cover member is used as the cover member, and the forming member of the electrical component mounting portion on which electrical components such as connectors, fuses, and relays are mounted can be used as the cover member without increasing the number of components . A press-fit fixing portion can be formed in the electric component mounting portion . And since the press-fit fixing part can be formed in the electrical component mounting part , the electric wire can be fixed at a position close to the connection part with the terminal, and the connection stability between the terminal and the electric wire can be secured to a higher degree. .
According to the first aspect of the present invention, the electric wire is press-fitted and fixed in each of the press-fit fixing portion of the insulating plate and the press-fit fixing portion of the electric component mounting portion, and the bottom surface of the recess of the insulating plate and the electric component mounting The electric wires can be sandwiched from both sides of the insulating plate and the electric component mounting portion in cooperation with the bottom surface of the recess of the portion. Thereby, movement of an electric wire can be blocked more firmly. In particular, the displacement of the electric wire from the insulating plate in the lifting direction can be effectively prevented at the bottom surface of the recess on the electric component mounting portion side.

According to a second aspect of the present invention, there is provided a pair according to the first aspect, wherein the press-fit fixing portion of the insulating plate and the press-fit fixing portion of the electrical component mounting portion are opposed to each other with a gap therebetween. The sandwiching ribs are formed, and the electric wire is sandwiched between the pair of sandwiching ribs. According to this aspect, in each press-fit fixing part of the insulating plate and the electric component mounting part , the holding rib can be bitten into the electric wire to hold the electric wire more firmly.

According to a third aspect of the present invention, in the first or second aspect, the insulating plate and the electrical component mounting portion are fixed to each other, and the insulation plate and the electrical component mounting portion are outside. The electric wire is extended.

According to this aspect, a small circuit board can be comprised by the comparatively small insulating board and electric component mounting part which are partially assembled | attached to an electric wire. Thereby, a small-sized electrical component mounting part can also be comprised, for example by using combining this aspect and said 2nd aspect. In this embodiment, the portion of the electric wire that extends to the outside of the insulating plate and the electrical component mounting portion is moved into a free state, and may be easily subjected to a tensile force on the connection portion with the terminal. However, it is possible to stably maintain the connection state with the terminal by fixing the electric wire at each of the press-fit fixing portion of the insulating plate and the press-fit fixing portion of the electric component mounting portion .

In the present invention, the electric wire is press-fitted and fixed at different positions in the length direction to the insulating plate where the electric wire is wired and the terminal is attached in a press-contact state to the electric wire, and the electric component mounting portion attached to the insulating plate. A press-fit fixing part is provided. Thereby, an electric wire can be fixed by both an insulation board and an electrical component mounting part , and it can prevent that tensile force is transmitted to the connection part with a terminal resulting from the displacement of an electric wire. As a result, the connection reliability between the terminal and the electric wire can be improved.

The perspective view of the circuit board for electrical junction boxes as one embodiment of the present invention. The disassembled perspective view of the circuit board for electrical junction boxes shown in FIG. The side view of the circuit board for electrical junction boxes shown in FIG. IV-IV sectional drawing in FIG. The top view of an insulating board. The side view of the insulating board shown in FIG. The principal part enlarged view of the insulating board shown in FIG. The principal part enlarged view different from FIG. 7 of the insulating board shown in FIG. The side view of a cover member. The principal part enlarged view of the cover member shown in FIG. The perspective view of a terminal. The principal part enlarged view of FIG. The principal part enlarged view of FIG.

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

  First, the circuit board (henceforth, circuit board) 10 for electric junction boxes as one embodiment of the present invention is shown in FIGS. The circuit board 10 has a structure in which an electric wire 14 is wired on an insulating plate 12 and connected to a terminal 16, and a cover member 18 is assembled to the insulating plate 12.

  5 and 6 show the insulating plate 12. The insulating plate 12 is made of a nonconductive synthetic resin. The insulating plate 12 has a long rectangular plate shape. A plurality of terminal mounting portions 20 are integrally formed on the insulating plate 12 along each of a pair of outer peripheral portions extending in the longitudinal direction. As shown in FIG. 7, the terminal mounting portion 20 is formed with a pair of wall portions 22 and 22 that are opposed to each other at a predetermined distance, and in the central portion between the facing surfaces of these wall portions 22 and 22, A slit-shaped terminal insertion hole 24 that opens upward (upward in FIG. 6) is formed. Furthermore, fixing ribs 26 and 26 are formed on both sides of the terminal insertion hole 24 on the opposing surfaces of the walls 22 and 22. As a result, a pair of fixing ribs 26, 26 formed on the corresponding wall portions 22, 22 are opposed to the terminal mounting portion 20 on both sides of the terminal insertion hole 24 with a gap therebetween.

  Further, outer peripheral wall portions 28 are formed on the outer peripheral edge portion extending in the longitudinal direction of the insulating plate 12. A plurality of press-fit fixing portions 30 are formed on the outer peripheral wall portions 28, 28. As shown in FIG. 8, the press-fit fixing portion 30 is a slit-like recess that opens upward (in FIG. 8) on the cover member 18 side, and its bottom surface 32 has a semicircular shape. Yes. The diameter dimension of the bottom surface 32 is made equal to the width dimension of the press-fit fixing portion 30 (the horizontal dimension in FIG. 8). The diameter size of the bottom surface 32 and the width dimension of the press-fit fixing portion 30 are the same as the outer diameter size of the electric wire 14. It is almost equal. A pair of sandwiching ribs 34 are formed on the opposing surface of the press-fit fixing portion 30 to face each other with a gap therebetween. Opposite distance between the holding ribs 34 and 34 (separated distance in the left-right direction in FIG. 8): d1 is set to be smaller than the outer diameter of the electric wire 14, and the electric wires 14 of the respective holding ribs 34 and 34 are provided. The amount of biting into is suitably set in the range of 0.05 mm to 0.25 mm, more preferably 0.1 mm to 0.2 mm on one side. Such a press-fit fixing portion 30 is formed corresponding to each terminal mounting portion 20, and the press-fit fixing portion 30 and the terminal mounting portion 20 are arranged in the short side direction (vertical direction in FIG. 7) of the insulating plate 12. It is formed on the same straight line.

  On the other hand, as shown in FIGS. 9 and 10, the cover member 18 is formed of a non-conductive synthetic resin. The cover member 18 is integrally formed with a connector hood 36 as an electrical component mounting portion for receiving and housing a connector as an electrical component (not shown). Although illustration is omitted, a plurality of terminal insertion holes are provided in the connector hood 36 as is conventionally known.

  Furthermore, in the cover member 18, a plurality of press-fit fixing portions 42 are formed in each of a pair of outer peripheral wall portions 40, 40 (only one is shown in FIG. 9) extending in the longitudinal direction. As shown in FIG. 10, the press-fit fixing portion 42 is a slit-like recess that opens downward (downward in FIG. 10) on the insulating plate 12 side, and its bottom surface 44 has a semicircular shape. ing. In the press-fit fixing part 42, the diameter dimension of the bottom surface 44 is made equal to the width dimension of the press-fit fixing part 42 (dimension in the left-right direction in FIG. 10), as in the press-fit fixing part 30 of the insulating plate 12. The diameter dimension and the width dimension of the press-fit fixing portion 42 are substantially equal to the outer diameter dimension of the electric wire 14. A pair of sandwiching ribs 46 are formed on the opposing surface of the press-fit fixing portion 42 to face each other with a gap therebetween. Opposing distance between the holding ribs 46 and 46 (a left-right distance in FIG. 10): d2 is set to be smaller than the outer diameter of the electric wire 14, and the electric wires 14 of the holding ribs 46 and 46, respectively. The amount of biting into is suitably set in the range of 0.05 mm to 0.25 mm, more preferably 0.1 mm to 0.2 mm on one side. The same number of press-fit fixing portions 42 as the press-fit fixing portions 30 corresponding to the press-fit fixing portions 30 of the insulating plate 12 are formed.

  And as shown in FIG. 2, while the electric wire 14 is inserted in each terminal attaching part 20 of the insulating board 12, the terminal 16 is inserted and fixed. The electric wire 14 is a conventionally well-known covered electric wire. For example, a core wire such as a copper wire is covered with an insulating film such as a vinyl chloride resin. On the other hand, as shown in FIG. 11, the terminal 16 is formed by press punching and bending a metal plate. One end portion of the terminal 16 is a press contact portion 49 including a pair of press contact blades 48 and 48, and the other end portion is a connection portion 50 extending with a square cross section or a rectangular cross section. Further, the terminal 16 in the present embodiment has a crank shape having a bent portion 52 at an intermediate portion in the length direction.

  And as shown in FIG. 12, the edge part of the electric wire 14 is each inserted between the wall parts 22 and 22 of each terminal attaching part 20, and it is clamped by the fixing ribs 26 and 26 formed in the wall parts 22 and 22. The Further, an intermediate portion in the length direction of the electric wire 14 is press-fitted between the holding ribs 34 and 34 of the press-fit fixing portion 30 and is held between the holding ribs 34 and 34. As shown in FIG. 13, the electric wire 14 is inserted into the press-fit fixing portion 30 to such an extent that it contacts the bottom surface 32 of the press-fit fixing portion 30. Further, the terminal 16 is inserted into the terminal insertion hole 24 of the terminal mounting portion 20 from the pressure contact portion 49 side. As a result, the end portion of the electric wire 14 inserted between the wall portions 22 and 22 is press-fitted between the press contact blades 48 and 48 to break the coating, and a core wire (not shown) as a conductor of the electric wire 14 is pressed against the press contact blade 48. , 48. As a result, as shown in FIG. 2, the terminal 16 protrudes from the connecting portion 50 and is fixed to the insulating plate 12 in a state where the electric wire 14 is pressed into contact with the core wire at the pressing portion 49.

  Subsequently, the cover member 18 is assembled to the insulating plate 12. As shown in FIG. 4, a cylindrical portion 54 is integrally formed at a substantially central portion in the longitudinal direction of the insulating plate 12, and a screw cylindrical portion 56 formed on the cover member 18 is inserted into the cylindrical portion 54 so that the cylindrical portion 54 is inserted. The screw member 56 is screwed to fix the cover member 18 and the insulating plate 12 to each other. As a result, the connection portions 50 of the terminals 16 projecting from the insulating plate 12 are inserted into the terminal insertion holes 24 of the cover member 18 and project into the connector hood 36.

  When the cover member 18 is assembled, the outer peripheral wall portion 40 of the cover member 18 is positioned outside the outer peripheral wall portion 28 of the insulating plate 12 as shown in FIG. On the outside of 30, the press-fit fixing portion 42 of the cover member 18 is overlapped. Then, the electric wire 14 is press-fitted between the holding ribs 46 and 46 of the press-fit fixing portion 42 of the cover member 18 and is held between the holding ribs 46 and 46. As shown in FIG. 13, the electric wire 14 is inserted into the press-fit fixing portion 42 to such an extent that it contacts the bottom surface 44 of the press-fit fixing portion 42. Thereby, the electric wire 14 is press-fitted and fixed to the press-fit fixing portion 30 of the insulating plate 12 and the press-fit fixing portion 42 of the cover member 18 at different positions in the length direction, and the press-fit fixing portion 30 and the press-fit fixing portion. Through 42, the insulating plate 12 and the cover member 18 are extended to the outside.

  Further, the electric wire 14 is sandwiched from both sides in the vertical direction (the vertical direction in FIG. 13) by the bottom surface 32 of the press-fit fixing portion 30 in the insulating plate 12 and the bottom surface 44 of the press-fit fixing portion 42 in the cover member 18. That is, the bottom surface 32 and the bottom surface 44 form a circular through hole 58 substantially equal to the outer diameter of the electric wire 14 in the side projection of the circuit board 10, and the electric wire 14 is connected to the circuit board 10 through the through hole 58. It extends to the outside. The diameter dimension of the through hole 58 excluding the sandwiching ribs 34 and 46 is substantially equal to the outer diameter dimension of the electric wire 14, and the electric wire 14 has both bottom surfaces 32 and 44 without any special contact pressure in the vertical direction. It is sandwiched between.

  According to the circuit board 10 having such a structure, the electric wire 14 press-contacted to the terminal 16 in the insulating plate 12 is press-fitted into the press-fit fixing portion 30 of the insulating plate 12 and the press-fit fixing portion 42 of the cover member 18. Thus, it can be fixed to both the insulating plate 12 and the cover member 18. Thereby, even when the electric wire 14 moves, transmission of the tensile force to the end part connected to the terminal 16 can be prevented, and the connection state between the electric wire 14 and the terminal 16 can be maintained more stably. Connection reliability can be improved.

  In particular, in the present embodiment, the holding ribs 34 and 46 are formed in the press-fit fixing portion 30 and the press-fit fixing portion 42, respectively. It can be held more firmly. Furthermore, by sandwiching the electric wire 14 from above and below between the bottom surface 32 of the press-fit fixing portion 30 and the bottom surface 44 of the press-fit fixing portion 42, the vertical displacement of the electric wire 14 can be more effectively prevented. Thus, according to the present embodiment, the horizontal displacement of the electric wire 14 is prevented by the press-fit fixing portion 30 and the press-fit fixing portion 42, and the vertical displacement is prevented by the press-fit fixing portion 30 and the press-fit fixing portion 42. It is possible to prevent them from cooperating with each other, and the transmission of the tensile force to the connection portion with the terminal 16 is more effectively prevented.

  In addition, the insulating plate 12 and the cover member 18 in the present embodiment are relatively small in size that are partially attached to the end of the electric wire 14. Thereby, a connector mounting part can be comprised compactly. And since the part extended to the exterior of the insulation board 12 and the cover member 18 in the electric wire 14 is made into the non-restraint state, there exists a possibility of moving large. According to this embodiment, the press-fit of the insulation board 12 is carried out. Since the movement of the electric wire 14 can be prevented by the fixing portion 30 and the press-fit fixing portion 42 of the cover member 18, the connection state with the terminal 16 can be stably maintained.

  Furthermore, according to the present embodiment, the connector hood 36 is formed on the cover member 18. Thereby, the press-fit fixing part 42 can be formed without increasing the number of parts by using the forming member of the connector hood 36. Since the press-fit fixing portion 42 can be positioned close to the terminal 16, the electric wire 14 is fixed at a position close to the press-contact portion with the terminal 16, and the connection stability between the terminal 16 and the electric wire 14 is further secured. I can do it.

  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 holding ribs 34 and 46 of the press-fit fixing portions 30 and 42 in the embodiment are not necessarily required, and the electric wire 14 may be press-contacted on the inner peripheral surfaces of the press-fit fixing portions 30 and 42. Furthermore, you may arrange | position the electric wire 14 with a clearance gap with respect to the bottom surfaces 32 and 44, without inserting until it contacts the bottom surfaces 32 and 44 with respect to the press-fit fixing parts 30 and 42.

  Further, the component mounting portion formed on the cover member is not limited to the connector hood to which the connector is mounted as in the above embodiment, and for example, a fuse mounting portion to which a fuse is mounted or a relay is mounted. A relay mounting part may be used. Furthermore, the insulating plate is not limited to a small one in which the electric wire is partially wired as in the above-described embodiment, but extends over substantially the entire electrical junction box and is a large plate-like shape in which the entire electric wire is wired. May be good.

10: Circuit board for electrical junction box, 12: Insulating plate, 14: Electric wire, 16: Terminal, 18: Cover member, 20: Terminal mounting part, 30: Press-fit fixing part, 32: Bottom surface, 34: Clamping rib, 36 : Connector hood (electric part mounting part), 42: Press-fit fixing part, 44: Bottom face, 46: Holding rib, 49: Press-contact part

Claims (3)

An electric wire is wired on the insulating plate, and the electric wire is disposed in the terminal mounting portion provided on the insulating plate, and the terminal is attached to the terminal mounting portion, so that the press contact portion of the terminal is In the circuit board for the electrical connection box connected to the conductor of the electric wire and projecting on the insulating plate,
On the insulating plate, an electric component mounting portion as a cover member made of synthetic resin is assembled, and the terminal protruding on the insulating plate is disposed in the electric component mounting portion ,
Each of the insulating plate and the electrical component mounting portion is provided with a set of press-fit fixing portions that press-fit and fix the electric wires connected to the terminals at different positions in the length direction .
The press-fit fixing portion of the insulating plate and the press-fit fixing portion of the electric component mounting portion are slit-like recesses that open toward the other of the insulating plate and the electric component mounting portion, respectively. The circuit board for an electrical junction box , wherein the electric wire is sandwiched between a bottom surface of the recess in the bottom and a bottom surface of the recess in the electrical component mounting portion . Each of the press-fit fixing portion of the insulating plate and the press-fit fixing portion of the electrical component mounting portion is formed with a pair of sandwiching ribs facing each other with a gap therebetween, and the electric wire is sandwiched between the pair of sandwiching ribs. The circuit board for an electrical junction box according to claim 1, wherein The electric junction box according to claim 1 or 2 , wherein the insulating plate and the electric component mounting portion are fixed to each other, and the electric wire extends out of the insulating plate and the electric component mounting portion . Circuit board.

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