JP2005020798A - Relay module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable relays to be disposed in a high density and to be reduced in size by raising a heat sink efficiency of heats generated by the relay and a bus bar connected to the relay. <P>SOLUTION: The relay module includes the bus bar 14 disposed on an upper surface of a heat sink metal plate 12 via an insulating sheet 13, a terminal 11b projected from a relay body 11a and having a lower end bent part 11b-1 welded or soldered fixedly to the upper surface of the bus bar 14, and a case plate 15 made of an insulating resin and having a through hole 15c passing through the relay body 11a and disposed on the upper surface of the bus bar 14 to cover the bus bar 14 in such a manner that a downward rib 15d and a support rib 15e projected from the case plate 15 and the rib 15d is interposed in a gap S between the bus bars 14 and insulated. Further, the support rib 15e is threaded into through holes 13a, 12a of the insulating sheet 13, the heat sink metal plate 12, and caulked and fixed to the heat sink metal plate 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a relay module, and more particularly, to improve heat dissipation efficiency of heat generated from a relay and a bus bar connected to the relay.
[0002]
[Prior art]
Conventionally, as a connection structure between a relay terminal and a bus bar in an electric junction box for automobiles, Japanese Patent Application Laid-Open No. 2000-83314 provides a structure shown in FIG. In the above structure, the conductor portions (bus bars) 2 and 3 are fixed to the surface of the circuit board 1, and the upper cover 4 and the lower cover 5 that cover the circuit board 1 are disposed on both the upper and lower surfaces of the circuit board 1. A relay 6 is arranged on the upper side. The conductor portion 2 and the relay 6 are connected by forming an insertion hole 5a in the lower cover 5, and directly joining the terminal portion 2a of the conductor portion 2 and the terminal 6a of the relay 6 through the insertion hole 5a.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-83314
[Problems to be solved by the invention]
However, with the structure of Patent Document 1, since the conductor portions 2 and 3 fixed to the surface of the circuit board 1 are covered by the upper and lower upper covers 4 and the lower cover 5, the terminal 6a of the relay 6 and the conductor portion 2 are covered. 3 is inferior in heat radiation efficiency. Therefore, when a plurality of relays 6 are provided, there is a problem that they cannot be arranged densely and the electric junction box cannot be reduced in size.
[0005]
The present invention has been made in view of the above problems, and it is an object to enable relays to be densely arranged by increasing the heat dissipation efficiency of heat generated from a relay and a bus bar connected to the relay, and to reduce the size of the relay module. Yes.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a relay module incorporated in an electric junction box for automobiles,
A bus bar is disposed on the upper surface of the heat radiating metal plate via an insulating sheet, and the lower end bent portion of the terminal protruding from the relay body is welded or soldered to the upper surface of the bus bar so that the relay body penetrates the upper surface of the bus bar. A case board made of insulating resin provided with a through hole is arranged to cover the bus bar, a rib is projected from the case board, and the adjacent bus bars are insulated by the rib. A relay module is provided.
[0007]
With the above configuration, since the heat radiating metal plate is arranged via the insulating sheet on the lower surface of the bus bar connected to the relay terminal, the heat generated from the relay and the bus bar can be transmitted to the heat radiating metal plate via the insulating sheet. The heat generated from the bus bar can be efficiently radiated. Therefore, the relays can be arranged densely, and the relay module can be reduced in size.
In addition, since ribs protrude from the case plate and the adjacent bus bars are insulated by the ribs, the interval between the bus bars can be narrowed, and relays can be more densely arranged.
When the metal plate for heat dissipation is exposed to the outer surface of the electrical junction box, the heat dissipation can be further improved, but it may be accommodated inside.
[0008]
Of the ribs projecting from the case plate, a part of the ribs is extended as a support rib, and the support rib is inserted into a through-hole drilled in communication with the insulating sheet and the metal plate for heat dissipation. The tip is caulked and fixed to the metal plate for heat dissipation.
[0009]
By fixing the lower end of the support rib to the heat radiating metal plate as described above, the heat radiating metal plate can be easily attached to the case plate across the bus bar, and the heat radiating metal plate is closely attached to the insulating sheet. It is possible to improve heat dissipation and improve heat dissipation performance.
In addition, by sandwiching the heat radiating metal plate, the insulating sheet, the bus bar, and the case plate between the upper and lower cases, the heat radiating metal plate can be sandwiched and fixed without being caulked and fixed by the support ribs. There is no need to provide it.
[0010]
The heat radiating metal plate is preferably made of an aluminum plate, and the insulating sheet is preferably made of a thin insulating rubber sheet having good thermal conductivity.
When an aluminum plate is used as the metal plate for heat dissipation, the heat conductivity is good and the weight is light, so that the heat generated by the bus bar can be quickly dissipated and the weight is not increased. In addition, if the thin insulating rubber sheet with good thermal conductivity is interposed between the bus bar and the metal plate for heat dissipation, the heat generated by the bus bar is conducted to the metal plate for heat dissipation while ensuring insulation between the bus bar and the metal plate for heat dissipation. can do.
[0011]
The relay module may be housed and assembled in a case made up of an upper case and a lower case of the electrical junction box, or may be assembled with the relay module exposed on the outer surface of the case. In this case, you may comprise the said case board of the said relay module with the upper case (or lower case) of an electrical-connection box main body.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an embodiment of the present invention.
FIG. 1 is a view showing an upper surface side of a junction box 20 for an automobile to which a relay module 10 is assembled. The relay module 10 is assembled in an upper case 21 of the junction box, and the relay 11 of the relay module 10 is installed in an upper case. 21 is projected upward from the opening 21a.
[0013]
As shown in FIG. 2, the relay module 10 is formed by laminating an insulating sheet 13 made of a thin insulating rubber sheet having a good thermal conductivity on the upper surface of a heat radiating metal plate 12 made of an aluminum plate. The bus bar 14 is arranged in the door. A relay 11 is mounted on the upper surface of the bus bar 14, and a case plate 15 formed of an insulating resin is disposed on the upper surface to cover the bus bar 14.
[0014]
In the relay 11, the relay terminal 11 b protruding from the lower surface of the relay body 11 a is bent into an L shape, and the lower end bent portion 11 b-1 in the horizontal direction is resistance-welded to the upper surface of the bus bar 14. Soldering may be used.
[0015]
The case plate 15 is fixed to the bus bar 14 as described above with the portion facing the relay main body 11a as a through hole 15a, penetrating the relay terminal 11b. In addition, the case plate 15 is provided with a frame portion 15c projecting in parallel to surround the outer periphery of the relay body 11a with a gap.
[0016]
Further, ribs 15d facing downward from the case plate 15 are provided so as to insulate the bus bars by interposing the ribs 15d in the gaps S of the bus bars 14 cut according to the circuit pattern.
Some ribs extend further downward to form support ribs 15e. Through holes 13a and 12a are provided in the insulating sheet 13 and the heat radiating metal plate 12 facing the support ribs 15e, the support ribs 15e are passed through the through holes 13a and 12a, and the tips protruding from the through holes 12a are caulked. Further, a caulking portion 15f that is fixed to the heat radiating metal plate 12 is provided. In addition, it is preferable that the said metal plate 12 for heat dissipation has exposed the whole or the position part outside.
[0017]
With the above configuration, the bus bar 14 connected to the terminal 11b of the relay 11 is heated, but the heat dissipating metal plate 12 is disposed on the lower surface of the bus bar 14 via the insulating sheet 13 having good thermal conductivity. The heat generated from the bus bar 14 is transmitted to the heat radiating metal plate 12 through the insulating sheet 13 and can be efficiently radiated.
Thus, since the heat generated in the bus bar by the relay 11 is dissipated by the heat radiating metal plate 12, the relays 11 can be arranged densely, and the relay module can be downsized.
[0018]
Further, ribs 15d are projected from the case plate 15 arranged to cover the bus bars 14, and the ribs 15d are interposed in the gaps S between the bus bars 14 connected to the relay terminals 11b to ensure insulation between the bus bars 14. Therefore, the relays 11 can be densely arranged.
[0019]
Further, a support rib 15e is projected from the case plate 15, and the support rib 15e is passed between the bus bars 14 so as to insulate the bus bars. Further, the insulating sheet 13 and the through holes 13a, 12a of the heat radiating metal plate 12 are provided. After passing, the tip is crimped and fixed to the heat radiating metal plate 12, so that the heat radiating metal plate 12 can be fixed by the case plate 15.
[0020]
In the embodiment described above, the relay main body of the relay protrudes from the upper surface of the case of the electrical junction box. However, the relay main body may be accommodated in a junction box configured to cover the upper case and the lower case.
Furthermore, when the upper case is covered, the case plate of the relay module may be eliminated, and the case plate may also be used as the upper case of the junction box.
[0021]
【The invention's effect】
As is clear from the above description, according to the present invention, the heat radiating metal plate is disposed on the lower surface of the bus bar connected to the relay terminal via the insulating sheet having good thermal conductivity, and thus the heat is generated from the relay and the bus bar. Heat can be radiated efficiently. Therefore, the relays can be arranged densely, and the relay module can be reduced in size.
Further, since ribs are provided so as to protrude from the case plate and the adjacent bus bars are insulated by the ribs, the intervals between the bus bars can be narrowed and densely arranged.
[0022]
Also, a support rib is provided on the case plate covering the bus bar, and the support rib is inserted into the space between the bus bars and through the through-hole formed by communicating with the insulating sheet and the heat radiating metal plate. Since it is crimped and fixed to the plate, the metal plate for heat dissipation can be easily fixed by the case plate.
[Brief description of the drawings]
FIG. 1 is an enlarged perspective view of a main part of an electric junction box to which a relay module of the present invention is attached.
FIG. 2 is a cross-sectional view of a relay module.
FIG. 3 is a view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Relay module 11 Relay 11a Relay main body 11b Terminal 12 Metal plate 12a for heat dissipation, 13a Through-hole 13 Insulation sheet 14 Bus bar 15 Case board 15d Rib 15e Support rib 20 Junction box S The clearance between bus bars

Claims (3)

A relay module incorporated in an electrical junction box for automobiles,
A bus bar is disposed on the upper surface of the heat radiating metal plate via an insulating sheet, and the lower end bent portion of the terminal protruding from the relay body is welded or soldered to the upper surface of the bus bar so that the relay body penetrates the upper surface of the bus bar. A case board made of insulating resin provided with a through hole is arranged to cover the bus bar, a rib is projected from the case board, and the adjacent bus bars are insulated by the rib. Relay module. Of the ribs projecting from the case plate, a part of the ribs is extended to become a support rib, and the support rib is inserted into a through hole that is drilled to communicate with the insulating sheet and the heat radiating metal plate, The relay module according to claim 1, wherein the tip thereof is caulked and fixed to the metal plate for heat dissipation. The relay module according to claim 1, wherein the heat radiating metal plate is made of an aluminum plate, and the insulating sheet is made of a thin insulating rubber sheet having good thermal conductivity.

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