JP2004343994A - Electrical junction box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat dissipation while maintaining compactness.
A power supply terminal is formed, and one bus bar for distributing and supplying power guided from the power supply terminal, and a plurality of relay parts each supplied with power from the one bus bar are fixed to respective relay fixing portions. 19, the other busbar 3 on which the control terminal 16 and the output terminal 17 of each relay component 6 are formed, the two busbars 2 and 3 are accommodated, and the power supply terminal 10, the control terminal 16 and the output An electrical junction box 1 including a case 7 having a connector cavity 7a in which a terminal 17 is disposed, wherein a distance between each of the relay fixing portions 19 of the other bus bar 3 and each of the control terminals 16 and the output terminals 17 is long. The bent portion 20 was formed in a range where the control terminal 16 and the output terminal 17 could be arranged in the connector cavity 7a.
[Selection] Figure 2

Description

  The present invention relates to, for example, an electric junction box in which a fuse and an electromagnetic relay are integrally housed and power is distributed and supplied through a plurality of relay circuits.

  FIG. 6 shows a conventional electric connection box 50 of this type. As shown in FIG. 6, the electric connection box 50 includes a bus bar 53 having a power supply terminal 51 formed at a lower end and a plurality of fuse terminals 52a formed at an upper end, and a plurality of sets of control terminals 54 (FIG. ), An output terminal 55 is formed, a plurality of fuse terminals 52b are formed at an upper end, and a plurality of relay parts 56 are fixed at a central portion. The other bus bar 57, and both bus bars 53, 57 are accommodated. And a case 58 having a connector cavity 58a formed at the lower end thereof, and a plurality of fuse parts 56 'mounted between the opposed fuse terminals 52a, 52b of the busbars 53, 57. The other bus bar 57 is formed by pressing a rigid conductive sheet metal into a predetermined shape to form an integral prototype bus bar 57a shown in FIG. 5, and a bus bar supporting resin body 57b (shown in FIG. 6) is attached to the integral prototype bus bar 57a. After being provided by insert resin molding, a predetermined portion of the integral prototype bus bar 57a is cut to form a desired relay wiring path body.

Then, the power supplied from the power supply terminal 51 is guided to each relay circuit through each pair of fuse terminals 52a and 52b, and the power is distributed and supplied to a desired output terminal 55 by ON / OFF operation of each relay circuit. Things.
JP-A-5-54787 JP 2002-343216 A

  By the way, the electric connection box 50 generates a large amount of heat because a plurality of relay components 56 are collectively arranged in the case 58 in order to reduce the size. In particular, in the case of distributing and supplying a large current, a heat radiation measure is indispensable. Here, in order to improve the heat radiation, it is conceivable to lengthen the other bus bar 57 in a straight shape to increase the heat radiation area, but the electric connection box 50 becomes large.

  As shown in FIG. 8, one bus bar 53 has a power supply connector terminal 72 formed to be connected to the + terminal side connector terminal of the vehicle power supply, and the one bus bar 53 has a fuse terminal 52 a and a connector terminal 72. Are connected by a plate portion. This plate portion is located between the fuse 56 ′ and the electromagnetic relay 56 and extends in the horizontal direction. The horizontal plate portion 75 is located on the side of the electromagnetic relay 56 and is vertically moved from one end of the horizontal plate portion 75. And a vertical plate portion 76 extending in the vertical direction.

  In the above-mentioned conventional electric connection box 50, the temperature of the fuse 56 'is easy to rise because the fuse 56' itself is a heating element, and the fuse 56 'is adjacent to the electromagnetic relay 56, which is a heating element. The temperature rises. Then, although the heat of the fuse 56 'is radiated through the bus bars 53 and 57, there is a problem that the temperature of the fuse 56' rises to a level which is more than practically allowable.

  Therefore, the present invention has been made to solve the above-described problems, and provides an electric junction box which is excellent in heat radiation while maintaining compactness and can suppress a rise in temperature of a fuse or the like. With the goal.

  According to the first aspect of the present invention, a power supply terminal is formed, and one bus bar for distributing power supplied from the power supply terminal and a plurality of relay parts each supplied with power from the one bus bar are fixed to each relay fixing portion. The other bus bar on which the control terminal and the output terminal of these relay parts are formed, and a case that accommodates the bus bar, and has a connector cavity portion for disposing the power terminal, the control terminal and the output terminal. Wherein the other busbar is formed with a bent portion that is bent in a plane direction of the busbar.

  In this electric connection box, the substantial length of the other bus bar is increased by the bent portion, and the heat radiation area is increased accordingly, while the length of the other bus bar in the height direction is suppressed.

  The invention according to claim 2 is the electrical junction box according to claim 1, wherein the bent portion is between each of the relay fixing portion and each of the control terminal and the output terminal, and the control terminal and the output terminal. Is set in a range that can be arranged in the connector cavity.

  In this electric connection box, in addition to the operation of the first aspect, the control terminal and the output terminal of the other bus bar are arranged inside without increasing the width of the connector cavity in the width direction.

  According to a third aspect of the present invention, in the electrical junction box according to the first or second aspect, the bent portion is bent substantially at right angles to a direction in which the relay component is fixed to the relay fixing portion, and The control terminal and the output terminal are also bent substantially at right angles.

  In this electric junction box, in addition to the effect of the first or second aspect of the invention, the substantial length of the other bus bar is increased by substantially the entire length of the bent portion, and the relay component is arranged along the bent portion. You.

  According to a fourth aspect of the present invention, in the electrical junction box according to any one of the first to third aspects, the control terminal and the output terminal extending from the vicinity of the relay fixing portion at the bent portion are integrated. , The control terminal and the output terminal are collectively arranged in the connector cavity.

  In this electric connection box, in addition to the functions of claims 1 to 3, the control terminals and the output terminals distributed to the other busbar at the bent portion are integrated, so that the heat dissipation area is increased and the other busbar is The length in the height direction is reduced.

  According to a fifth aspect of the present invention, there is provided a conductive first metal plate on which one fuse terminal is formed, a conductive second metal plate on which the other fuse terminal is formed, the one fuse terminal and the other one. In an electric connection box including a fuse connected to a fuse terminal and an electromagnetic relay mounted on the first metal plate adjacent to the fuse, the first metal is sandwiched between the fuse and the electromagnetic relay. A plate and the second metal plate are arranged to face each other.

  The invention according to claim 6 is the electric connection box according to claim 5, wherein a plurality of the electromagnetic relays are mounted on the first metal plate.

  The invention according to claim 7 is the electrical junction box according to claim 6, wherein a plurality of the other fuse terminals are formed on the second metal plate.

  The invention according to claim 8 is the electric connection box according to any one of claims 5 to 7, wherein a connector terminal is formed integrally with the second metal plate.

  As described above, according to the first aspect of the present invention, one bus bar on which a power terminal is formed, a plurality of relay components are fixed to each relay fixing portion, and the control terminal and the output terminal of each relay component are fixed. An electrical connection box comprising: a busbar having the other busbar formed therein; and a case having a connector cavity for accommodating both busbars and arranging a power supply terminal, a control terminal, and an output terminal, wherein the other busbar is provided. Has a bent portion that is bent in the plane direction of the bus bar, so that the substantial length of the other bus bar is increased by the bent portion, so that the heat radiation area is increased by that amount, and the height of the other bus bar is increased. Since the bending is suppressed by the bent portion, the heat dissipation can be improved while maintaining the compactness.

  According to the second aspect of the present invention, in the electrical junction box according to the first aspect, the bent portion is provided between the relay fixing portion and each of the control terminal and the output terminal, and connects the control terminal and the output terminal to the connector. Since it is set within the range that can be arranged in the cavity, in addition to the effect of the invention of claim 1, the control terminal and the output terminal of the other bus bar are arranged inside without increasing the width direction of the connector cavity. The compactness of the junction box in the width direction can be maintained.

  According to the third aspect of the present invention, there is provided the electrical junction box according to the first or second aspect, wherein the electrical connection box is bent substantially perpendicularly to a direction in which the relay component is fixed to the relay fixing portion, and the control terminal and the output terminal are bent. Since it is bent substantially at a right angle, in addition to the effects of the invention of claim 1 or claim 2, the substantial length of the other bus bar becomes longer by substantially the entire length of the bent portion, and the relay component extends along the bent portion. Are arranged, a large heat radiation area can be taken, and the other busbar and the relay component can be collectively arranged.

  According to a fourth aspect of the present invention, there is provided the electrical junction box according to any one of the first to third aspects, wherein the control terminal and the output terminal distributed to the other bus bar at the bent portion are integrated. Therefore, the length of the other bus bar in the height direction can be suppressed while increasing the heat radiation area.

  According to the invention of claim 5, the width of the plate portion of the second metal plate can be made equal to the length from the end of the fuse to the end of the electromagnetic relay in the direction in which the fuse and the electromagnetic relay are arranged. In addition, the heat dissipation area of the second metal plate can be increased, so that the heat dissipation can be improved and the temperature rise of the fuse can be suppressed. Further, since the electromagnetic relay is sandwiched between the two metal plates, the heat of the electromagnetic relay is radiated from the two metal plates, and the temperature rise of the electromagnetic relay can be suppressed. Along with this, it is possible to suppress an increase in the temperature of the fuse due to heat from the electromagnetic relay.

  According to the invention of claim 6, when a plurality of electromagnetic relays are mounted on the first metal plate, the temperature of the fuse tends to rise more easily because the fuse receives heat from the plurality of electromagnetic relays. The present invention is particularly effective for an electric junction box on which a plurality of electromagnetic relays are mounted.

  According to the invention of claim 7, since a plurality of other fuse terminals are formed on the second metal plate, heat of the fuse terminal having a higher temperature is efficiently radiated at a portion having a lower temperature. For this reason, the temperature rise of the fuse can be further suppressed.

  According to the invention of claim 8, since the connector terminal is formed integrally with the second metal plate, the connector terminal formed on the second metal plate is connected to the mating connector terminal, so that the second metal plate is connected to the second metal plate. (2) The heat transmitted to the metal plate can be positively transmitted to the mating connector terminal (when applied to a vehicle, the mating connector is connected to the vehicle harness) to dissipate heat. Therefore, the heat from the electromagnetic relay and the fuse can be efficiently released to the outside of the electric connection box, and as a result, the temperature rise of the fuse due to the heat from the electromagnetic relay can be further suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show a first embodiment of the present invention. FIG. 1 is an exploded perspective view of an electric connection box 1, FIG. 2 is a longitudinal sectional view of the electric connection box 1, and FIG. It is a perspective view of the integral prototype bus bar 12 which is a process.

  As shown in FIGS. 1 and 2, the electric connection box 1 includes a busbar assembly 4 to which one busbar 2 and the other busbar 3 are assembled, and a busbar assembly 4 that is assembled to the busbar assembly 4. , A busbar 2, a busbar assembly 4, and a case 7 in which the internal cover 5 is accommodated, a fuse cavity 8 assembled above the case 7, and a projecting projecting part from the fuse cavity 8. And four fuse parts 9 attached to the fuse terminals.

  The bus bar 2 is formed by press-forming rigid conductive sheet metal into a predetermined shape, and has a power supply terminal 10 formed at a lower end and a fuse terminal 11 formed at four places at an upper end.

  The busbar assembly 4 is formed by press-forming a rigid conductive sheet metal into a predetermined shape to form an integral prototype busbar 12 shown in FIG. An insert molded product is prepared, and a predetermined portion of the integral prototype bus bar 13 of the insert molded product is cut to form the other bus bar 3 which is a desired relay wiring path body. 15 and a switch (not shown) are fixed. The bus bar assembly 4 thus formed has four sets of control terminals 16 and output terminals 17 formed at the lower end, fuse terminals 18 formed at four places at the upper end, and a relay component at the center. The relay fixing portion 19 to which the coil 15 and the switch (not shown) are fixed is formed at four positions.

  Further, the space between each relay fixing portion 19 of the other bus bar 3 and these control terminal 16 and output terminal 17 is formed longer than that of the conventional example, and the portion of this long size is formed as control terminal 16. In addition, the bent portion 20 is formed in a range where the output terminal 17 can be arranged in the connector cavity 7a. As shown in FIGS. 2 and 3, the bent portion 20 is bent with respect to the plane direction of the other bus bar 3, and specifically, a direction in which the coil 15 and a switch (not shown) are fixed. And the control terminal 16 and the output terminal 17 are also bent substantially at a right angle. That is, the other bus bar 3 is bent in a crank shape between the relay fixing portion 19 and the control terminal 16 and the output terminal 17.

  Returning to FIG. 1 and FIG. 2, the inner cover 5 is assembled to the bus bar supporting resin body 13, and the inner cover 5 and the bus bar supporting resin body 13 make up four sets of coils 15 and switches (not shown) of the relay component 6. Is covered over its entire circumference. The case 7 has a rectangular parallelepiped shape in which an upper surface side and a lower surface side are penetrated, and a lower portion is formed as a connector cavity 7a. In the case 7, one bus bar 2 and the other bus bar 3 are housed in an assembled state from an opening on the upper surface side. The power supply terminal 10 of one bus bar 2 and the four control terminals 16 and the output terminal 17 of the other bus bar 3 are arranged in the connector cavity 7a.

  The fuse cavities 8 are mounted on the upper surface side of the case 7, and are formed at four positions of the plate portion 8 a for closing the opening of the upper surface of the case 7 and the plate portion 21, and arranged at positions facing the fuse terminals 11 and 18 of each set. And a mounted fuse mounting portion 8b.

  As described above, in the electric connection box 1, while the substantial length of the other bus bar 3 is increased by the bent portion 20 and the heat radiation area is increased by that amount, the height direction of the other bus bar 3 is suppressed. The heat dissipation can be improved while maintaining the compactness in the height direction of 1. In addition, in the above-described first embodiment, the bent portion 20 arranges the control terminal 16 and the output terminal 17 between each relay fixing portion 19 and each control terminal 16 and the output terminal 17 in the connector cavity 7a. Since the control terminal 16 and the output terminal 17 of the other bus bar 3 are set within the connector bus 7a without increasing the width of the connector cavity 7a, the electrical connection box 1 can be made more compact in the width direction. Can be maintained.

  That is, when the other bus bar 3 of the present invention and the conventional other bus bar 57 are set at the same height, the substantial length of the other bus bar 3 of the present invention is increased by the bent portion 20 as compared with the conventional bus bar. While the heat radiation area increases by that amount, the control terminal 16 and the output terminal 17 of the other bus bar 3 are arranged in the connector cavity 7a having the same height and width as the conventional one. As described above, the heat dissipation can be improved while maintaining the compactness of the electrical junction box 1 in both the height and width directions.

  Further, the control terminal 16 and the output terminal 17 extending from the vicinity of the relay fixing portion 19 are gathered at the bent portion 20, and the control terminal 16 and the output terminal 17 are arranged in the connector cavity 7a. It achieves further compactness in the vertical direction.

  The bent portion 20 of the first embodiment is bent substantially at right angles to the relay fixing portion 19 in the direction in which the coil 15 and the switch (not shown) of the relay component 6 are fixed. Since the other bus bar 3 is bent substantially at a right angle, the substantial length of the other bus bar 3 becomes longer by almost the entire length b of the bent portion 20. Further, since the coil 15 and the switch (not shown) of the relay component 6 are arranged along the bent portion 20, a large heat radiation area can be taken, and the other bus bar 3 and the coil 15 of the relay component 6 can be disposed. Switches (not shown) can be collectively arranged.

  In the first embodiment, as shown in FIG. 2, the bent portion 20 is arranged so that the power terminal 10, the output terminal 17, and the control terminal 16 intersect in order to secure a sufficient heat radiation area. However, when the heat radiation amount is relatively small, the bent portion 20 is provided so that the power terminal 10 and the output terminal 17 and the control terminal 16 do not cross each other, so that the connector cavity 7a can have a sufficient heat radiation amount. Can be reduced in size.

  4 and 5 show a second embodiment of the electric junction box according to the present invention. FIG. 4 is a cross-sectional view showing the entire configuration of the electric junction box. FIG. 5 is a cross-section taken along line AA of FIG. FIG.

  The electric connection box 1A has a built-in electromagnetic relay, and is used for controlling the energization of vehicle electric devices such as a head lamp and a wiper motor of a vehicle (not shown). And the up-down direction shown by the arrow in the figure has shown the attitude | position of 1 A of electric connection boxes in a vehicle mounting state.

  4 and 5, a conductive substrate 1 'of the electrical junction box 1A includes a conductive first metal plate (one bus bar) 11' formed by stamping a single copper-based metal plate with a press. And a resin layer 12 'covering a part of the first metal plate 11'. On the first metal plate 11 ', four fuse terminals 111 to which the fuses 2' are mounted, a number of connector terminals 112 connected to connector terminals on the external electric circuit (not shown), and the like are formed.

  Four electromagnetic relays 3 'are mounted on the conductive board 1', and more specifically, the electromagnetic relays 3 'are mounted on the vertically extending vertical wall surface 113 of the conductive board 1'. The electromagnetic relay 3 ′ includes a fixed contact 31, a movable contact 32 that opens and closes an electric circuit for energizing a vehicle electrical device by moving with respect to the fixed contact 31, and an electromagnetic coil that generates an electromagnetic force to drive the movable contact 32. (Hereinafter referred to as a coil) 33 and the like.

  The fixed contact 31 and the movable contact 32 are electrically connected via a first metal plate 11 'to an external electric circuit for energization. The coil 33 is electrically connected to a driving electric circuit (not shown) that supplies power to the coil 33 via the first metal plate 11 ′.

  A resin cover 4 'for covering the electromagnetic relay 3' is mounted on the conductive board 1 '. The cover 4 'has a substantially box shape with an opening only on the conductive substrate 1' side, and the electromagnetic relay 3 'is stored in a relay storage space surrounded by the cover 4' and the conductive substrate 1 '.

  The conductive substrate 1 'and the cover 4' are housed in first and second housings 5 'and 6' made of resin. The upper surface of the first housing 5 'is formed with four upper openings 51. The upper opening 51 has a fuse terminal 111 of the first metal plate 11' and a second metal plate (the other busbar) to be described later. 7) A fuse terminal 71 of 7 'is arranged. The lower surface of the second housing 6 ′ is formed with three lower openings 61, 62, 63. Of the three lower openings 61, 62, 63, the first and second lower openings 61, 62 are formed. , A plurality of connector terminals 112 of the first metal plate 11 ′ are respectively arranged, and the power supply connector terminals 72 of the second metal plate 7 ′ are independently arranged in the third lower opening 63.

  The second metal plate 7 ′ is formed by press-forming a copper-based metal plate, and has four fuse terminals 71 to which the fuses 2 ′ are mounted, and a power supply connected to a + terminal side connector terminal of a vehicle power supply (not shown). Connector terminal 72 is formed. The fuse terminal 71 and the power connector terminal 72 are connected by a plate 73 located between the cover 4 ′ and the first housing 5 ′.

  The second metal plate 7 'is arranged opposite to the first metal plate 11' so as to sandwich the fuse 2 'and the electromagnetic relay 3'. More specifically, the plate portion 73 faces the vertical wall surface 113 of the first metal plate 11 ′, and the electromagnetic relay 3 ′ is located between the plate portion 73 and the vertical wall surface 113.

  In the electrical junction box 1A of the second embodiment having the above-described configuration, the first metal plate 11 'and the second metal plate 7' are arranged to face each other with the fuse 2 'and the electromagnetic relay 3' interposed therebetween. Therefore, the width W of the plate portion 73 of the second metal plate 7 ′ in the direction in which the fuse 2 and the electromagnetic relay 3 ′ are arranged (the vertical direction in FIG. 4) is equal to the width W in the arrangement direction of the fuse 2 ′ and the electromagnetic relay 3 ′. And the length L from the end of the fuse 2 'to the end of the electromagnetic relay 3'. Therefore, the heat radiating area of the second metal plate 7 'can be made larger than before, and the heat radiating property can be improved, and the temperature rise of the fuse 2' can be suppressed.

  Further, since the electromagnetic relay 3 'is sandwiched between the first metal plate 11' and the second metal plate 7 ', heat of the electromagnetic relay 3' is generated from the first metal plate 11 'and the second metal plate 7'. The heat is radiated, and the temperature rise of the electromagnetic relay 3 'can be suppressed. Along with this, it is possible to suppress a temperature rise of the fuse 2 'due to heat from the electromagnetic relay 3'.

  Further, since a plurality of (four in this example) fuse terminals 71 are integrally formed on the second metal plate 7 ', the heat of the higher temperature fuse terminal is efficiently radiated at the lower temperature portion. Therefore, the temperature rise of the fuse 2 'can be further suppressed.

  The second metal plate 7 'has a plurality of fuse terminals 71 but only one power supply connector terminal 72, so that the mating connector can be simplified and the harness of the mating connector can be simplified. Can be.

  In addition, since the second metal plate 7 'can be bent only in one direction, the processing is facilitated and the assemblability is improved.

  In the second embodiment, the electric junction box 1A having a plurality of electromagnetic relays 3 'is shown. However, the present invention can be applied to a case in which only one electromagnetic relay 3' is incorporated. .

  Further, in the second embodiment, the example in which the electric junction box according to the present invention is applied for controlling electric equipment for a vehicle such as a headlamp or a wiper motor has been described. It may be used for controlling electric equipment for vehicles, or may be used for controlling electric equipment other than vehicles.

FIG. 2 shows the first embodiment of the present invention, and is an exploded perspective view of an electric junction box. It is a longitudinal section of an electric junction box which shows a 1st embodiment of the present invention. FIG. 6 shows the first embodiment of the present invention, and is a perspective view of an integral prototype bus bar in the process of producing the other bus bar. It is sectional drawing of the electric junction box of 2nd Embodiment of this invention. FIG. 5 is a sectional view taken along line AA of FIG. 4. It is a longitudinal section of an electric junction box which shows a conventional example. FIG. 10 is a perspective view of an integrated prototype bus bar, showing a conventional example, in the process of producing the other bus bar. It is a cross-sectional view of the electric junction box of the conventional example.

Explanation of reference numerals

1, 1A Electrical connection box 2 One bus bar 3 The other bus bar 6 Relay parts 7 Case 7a Connector cavity 10 Power supply terminal 16 Control terminal 17 Output terminal 19 Relay fixing part 20 Bend part 2 'Fuse 3' Electromagnetic relay 7 'Second metal Plate 71 The other fuse terminal 72 Connector terminal 11 ′ First metal plate 111 One fuse terminal

Claims (8)

A power supply terminal is formed, and one bus bar for distributing and supplying power guided from the power supply terminal, and a plurality of relay components each of which is supplied with power from the one bus bar are fixed to each relay fixing portion, and the relay components are connected to each other. An electric connection box comprising: a bus bar on which the control terminal and the output terminal are formed; and a case that accommodates the bus bar and has a connector cavity portion in which the power supply terminal, the control terminal, and the output terminal are arranged. So,
An electric connection box, wherein a bent portion is formed on the other busbar so as to bend in a plane direction of the busbar. The electrical junction box according to claim 1,
The bent portion is set between each of the relay fixing portions and each of the control terminal and the output terminal, and in a range where the control terminal and the output terminal can be arranged in the connector cavity. Connection box. An electrical connection box according to claim 1 or claim 2,
The bent portion is bent substantially at right angles to a direction in which the relay component is fixed to the relay fixing portion, and is also bent at substantially right angles to the control terminal and the output terminal. Electrical junction box. The electrical junction box according to any one of claims 1 to 3, wherein
The control terminal and the output terminal extending from the periphery of the relay fixing portion at the bent portion are aggregated,
The electric connection box, wherein the control terminal and the output terminal are collectively arranged in the connector cavity. A conductive first metal plate on which one fuse terminal is formed, a conductive second metal plate on which the other fuse terminal is formed, and a fuse connected to the one fuse terminal and the other fuse terminal An electrical junction box comprising: an electromagnetic relay mounted on the first metal plate adjacent to the fuse;
An electric connection box, wherein the first metal plate and the second metal plate are arranged so as to sandwich the fuse and the electromagnetic relay.   The electrical junction box according to claim 5, wherein a plurality of the electromagnetic relays are mounted on the first metal plate.   7. The electric connection box according to claim 6, wherein a plurality of the other fuse terminals are formed on the second metal plate. The electrical connection box according to any one of claims 5 to 7, wherein a connector terminal is formed integrally with the second metal plate.

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