JP4669328B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box containing a circuit board.

Conventionally, what was disclosed by patent document 1 is known as an electrical junction box with which a vehicle etc. are equipped. In this case, a circuit structure in which a heat sink is laminated on one surface of a circuit board is accommodated in a casing. A heat radiating opening is formed in the side wall of the casing, and the heat radiating plate is exposed from the heat radiating opening to the outside of the casing. Thereby, the heat generated in the circuit structure is dissipated from the heat radiating plate to the outside of the electrical junction box.
JP 2004-328939 A

  However, according to the above configuration, since the heat sink is exposed to the outside of the casing, there is a concern that the waterproofness of the electrical junction box may deteriorate due to moisture entering from the boundary between the heat sink and the casing. Is done.

  The present invention has been completed based on the above circumstances, and an object thereof is to provide an electrical junction box with improved waterproofness.

As a means for achieving the above object, the invention of claim 1 is characterized in that a heat sink is laminated on a circuit board, and the heat sink has a relief recess for escaping a protruding portion of the circuit board. In the electrical junction box in which the circuit structure formed to bulge to the opposite side is accommodated in the casing, the casing receives heat from the heat radiating plate and dissipates it to the outside of the casing provided part facing the radiator plate, wherein the heat radiating wall, the heat radiating plate the relief regions other than the concave portion is provided near the wall which is close to the heat radiating plate Rutotomoni of the radiating wall, The outer surface side of the casing is formed so as to be substantially flat, and the inner surface side of the casing is provided with a thick portion at a position corresponding to the adjacent wall portion, and at least the heat radiating wall portion of the casing is synthesized. It is formed by injection molding of fat, wherein the said thick portion of the heat radiating wall, characterized in that the portion theft plurality of meat are intermittently formed.

<Invention of Claim 1>
According to invention of Claim 1, since it was set as the structure which covers the whole circuit structure body with a casing, the waterproofness of an electrical-connection box can be improved.

  In addition, the heat dissipation from the circuit board to the heat sink has been improved by forming a relief recess in the protrusion that protrudes from the circuit board in the heat sink and bringing the circuit board and the heat sink into close contact with each other. Can be prevented from becoming locally hot.

  The heat generated from the circuit board and the electronic component mounted thereon is sequentially transmitted to the heat radiating plate and the heat radiating wall, and is dissipated from the outside of the heat radiating wall to the outside of the electrical junction box.

  Furthermore, the proximity wall part for making the area | regions other than the bulging part of a heat sink close to a heat sink is formed in the inner surface side of a casing among heat sink walls. Thereby, since the heat transfer property from the heat radiating plate to the heat radiating wall is improved, it is possible to further prevent the electric junction box from being locally heated.

Further , since the heat radiating wall portion is formed so as to be substantially flat on the outer surface side of the casing, for example, in the mounting operation of the electric junction box, the casing, and various in-vehicle components disposed outside the electric junction box Can be prevented from colliding.

  Moreover, since the thick part was provided in the position corresponding to a proximity | contact wall part, heat is transmitted from the inner surface side of a thermal radiation wall part to the outer surface side via a thick part. Thereby, since the heat conductivity of a heat radiating wall part can be improved, the heat dissipation of an electrical junction box can be improved.

Here, since the thick part is formed in the heat radiating wall part, sink marks occur in the thick part depending on the thickness, and the heat radiating plate and the heat radiating wall part are separated from the heat radiating plate to the heat radiating wall part. There is a concern that the heat conductivity of the material will decrease.

  Therefore, for example, it is conceivable to prevent sinking of the thick part by forming a meat stealing part over the entire area of the thick part, thereby preventing a decrease in heat transfer from the heat radiating plate to the heat radiating wall part. According to this method, the heat generated from the circuit board is transferred from the heat radiating plate to the heat radiating wall, and then transferred to the air layer in the meat stealing part. There is a concern that the heat transfer in the section will decrease. Thus, it has been difficult to achieve both improvement in heat transfer from the heat radiating plate to the heat radiating wall and improvement in heat transfer in the heat radiating wall.

Therefore , a plurality of meat stealers are intermittently formed in the thick part. First, by forming the meat stealing portion, it is possible to suppress the occurrence of sink marks in the thick-walled portion and to improve the heat transfer from the heat radiating plate to the heat radiating wall portion. Furthermore, by intermittently forming the plurality of meat stealing portions, the heat transferred to the heat radiating wall portion is transferred to the outer surface of the heat radiating wall portion through the thick wall portion left between the plurality of meat stealing portions. It is transmitted, and the heat transfer in the heat radiating wall can be improved. Thus, according to the present invention, it is possible to improve both the heat transfer from the heat sink to the heat radiating wall and the heat transfer in the heat radiating wall.

  An embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the present invention is applied to an electric junction box 10 for a vehicle. As shown in FIG. 1, the electrical junction box 10 according to the present embodiment includes a circuit component 12 accommodated in a horizontally long flat casing 11. The casing 11 includes a lower case 15 having an open upper surface in FIG. 1, an upper case 13 assembled from above to cover the open upper surface of the lower case 15, and a removable and liquid-tight attachment above the upper case 13. With a cover to be made.

  The lower case 15 is made of a synthetic resin and has a horizontally long and flat box shape with the upper surface open. A flange 16 is formed on the outer peripheral surface near the upper end of the side wall of the lower case 15 so as to project outward. The lower end edge of the side wall of the upper case 13 is in contact with the flange 16 from above.

  The upper case 13 is made of a synthetic resin and is formed by injection molding. The upper case 13 has a horizontally long flat box shape with the lower surface opened, and the right side wall in FIG. 1 functions as a heat radiating wall 17 as described later. The opening formed in the lower surface of the upper case 13 serves as an insertion opening 18 for inserting the circuit component 12 into the upper case 13 from below. The electrical junction box 10 according to the present invention is arranged so that the insertion opening 18 is at the bottom. Further, a fuse block insertion opening 20 for inserting a later-described fuse block 19 is formed on the upper wall of the upper case 13 in FIG. A circuit component 12 is accommodated in the upper case 13.

  A cap-shaped cover 14 is attached above the upper case 13. In FIG. 1, a waterproof groove 21 is formed at the lower end edge of the side wall of the cover 14. On the other hand, a waterproof ridge 22 protruding upward in FIG. 1 is formed at the edge of the upper wall of the upper case 13. The waterproof ridge 22 of the upper case 13 is fitted into the waterproof groove 21 of the cover 14 from below so that the space between the upper case 13 and the cover 14 is waterproofed.

  3 to 8 illustrate the configuration of the circuit configuration body 12. As shown in FIG. 6, the circuit structure 12 includes a circuit board 23 and a metal heat sink 24 laminated on the lower surface side of the circuit board 23 in FIG. 6. 6 is covered with a frame 25 and an inner case 26. 6 and 7, the circuit board 23 is drawn in the horizontal direction.

  The circuit board 23 has a control circuit formed on the surface of a substantially rectangular insulating substrate 28 by printed wiring means, and is mounted on this surface side so that an electronic component 27 such as a switching element is connected to the control circuit. ing. On the other hand, on the back surface side of the insulating substrate 28, a plurality of bus bars 29 in which a predetermined power circuit is formed by punching and forming a metal plate are electrically connected to the electronic component 27 or the control circuit, Further, the insulating substrate 28 is adhered along an insulating adhesive sheet (not shown) along the back surface of the insulating substrate 28.

  The end of the bus bar 29 that extends to the right of the circuit board 23 in FIG. 6 is bent at a right angle twice on the circuit board 23 side, bent into a crank shape, and protrudes to the right in FIG. It is like that. The end portion is led out from between the inner case 26 and the frame body 25 and then introduced into the fuse block 19. Further, the end of the bus bar 29 that extends to the left of the circuit board 23 in FIG. 7 is bent at a right angle twice on the circuit board 23 side, bent into a crank shape, and to the left in FIG. It is designed to protrude. This end is introduced into a connector block 30 described later.

  The radiator plate 24 is made of metal and has a substantially rectangular shape that is slightly larger than the insulating substrate 28. The heat radiating plate 24 is bonded to the bus bar 29 in an insulating state on the lower surface side of the bus bar 29 with an adhesive (not shown).

  The frame body 25 is made of synthetic resin, and is bonded to the upper surface of a portion of the heat radiating plate 24 that extends from the outer edge of the insulating substrate 28 with an adhesive (not shown), and from the lower surface side of the heat radiating plate 24 to the screw 31A. (See FIGS. 6 to 8). The screws 31A are arranged in rows in the vertical direction on the back surface side of the heat radiating plate 24 at positions near the left end, near the center, and positions near the right end in FIG. As shown in FIG. 5, the frame 25 has an open shape in FIG. 5, and surrounds the periphery of the circuit board 23 without any breaks, so that the circuit board 23 is accommodated in the opening. It has become. A plate-like locking portion 32 extends downward from the lower end edge in FIG. The engaging portion 32 is engaged with a groove-like engaging portion 33 formed on the right end edge of the lower case 15 in FIG. 1 from above in FIG. 1 and is sandwiched between the wall surfaces of the engaging portion 33. The circuit structure 12 and the heat radiating wall 17 are held so as not to be separated in the left-right direction in FIG. Thereby, since it can prevent that the space | interval of the heat sink 24 and the heat radiating wall part 17 spreads, it can prevent that the heat conductivity from the heat sink 24 to the heat radiating wall part 17 falls.

  The inner case 26 is made of synthetic resin, has a shallow container shape, and is attached so as to cover the circuit board 23 from above the frame 25 in FIG. A lock projection 34 is formed at a predetermined position on the outer surface of the side wall of the frame 25 described above, while a lock receiving portion 35 is formed at a position corresponding to the lock projection 34 on the side wall of the inner case 26. (See FIG. 4). The cover 14 and the frame 25 are assembled by elastically engaging the lock projection 34 of the frame 25 and the lock receiving portion 35 of the cover 14.

  A fuse block 19 is attached above the frame 25 at a position near the right end of the frame 25 in FIG. As shown in FIG. 5, the fuse block 19 is substantially U-shaped, and includes a substantially rectangular parallelepiped main body 19A and two attachment portions 19B extending in the same direction from both ends of the main body 19A. As shown in FIG. 4, the fuse block 19 is screwed to the mounting portion 19B of the fuse block 19 and the frame 25, and the fuse block 19 and the heat radiating plate 24 are connected from the heat radiating plate 24 side by screws 31B in FIG. The circuit structure 12 is attached by screwing. Screws 31B for screwing the fuse block 19 and the heat radiating plate 24 are arranged in a row in the vertical direction in FIG. 8 with the screws 31A for screwing the frame body 25 and the heat radiating plate 24 described above. It has become so. As will be described in detail later, the circuit structure 12 is inserted into the upper case 13 from the lower side in FIG. 1 through the insertion opening 18 of the upper case 13 so that the PCB connector 41 faces downward. ing. For this reason, the screws 31A and 31B are arranged in a line along the direction in which the circuit component 12 is inserted into the upper case 13. Of the screws 31A and 31B depicted in FIG. 8, the screw disposed on the uppermost side in FIG. 8 is a screw 31A for screwing the fuse block 19 and the heat sink 24, and the others are as follows. A screw 31B for screwing the frame 25 and the heat sink 24 is used.

  The fuse block 19 is provided with a fuse mounting portion 36 that opens to the right in FIG. 6, and a fuse 37 is attached to the fuse mounting portion 36 so that it can be inserted and removed from the left and right directions in FIG. It has become. As shown in FIG. 6, the end portion of the bus bar 29 is arranged in the fuse mounting portion 36 with one end protruding into the opening and the other end penetrating the back wall. A relay terminal 38, which will be described later, is disposed in the fuse mounting portion 36 with one end protruding into the opening. The end portion of the bus bar 29 and the relay terminal 38 are mounted on the back wall of the fuse mounting portion 36 side by side in two upper and lower stages in FIG. 6, and the end portion of the bus bar 29 is disposed on the lower stage side. A relay terminal 38 is disposed on the upper side. The end of the bus bar 29 and the relay terminal 38 are connected by a fuse 37 inserted in the fuse mounting portion 36.

  A relay connector 39 is attached to the left side of the fuse block 19 in FIG. 6 by being fitted to the fuse block 19 and screwed to the fuse block 19 from the upper surface side in FIG. The relay connector 39 is provided with a connector hood 40A that opens to the left in FIG. In the connector hood 40A, a relay terminal 38 is arranged with one end protruding into the opening and the other end penetrating the back wall.

  As shown in FIG. 5, the relay terminal 38 is formed by punching a metal plate and bending it into a substantially crank shape. As shown in FIGS. 6 and 7, the relay terminal 38 has a left end facing the connector hood 40 </ b> A of the relay connector 39 (see FIG. 7) and a right end facing the fuse mounting portion 36 of the fuse block 19. (See FIG. 6). A mating connector 43 (not shown) is fitted to the connector hood 40A so as to be insertable / removable from the left and right directions in FIG.

  As shown in FIG. 4, connector blocks 30, 30 are disposed at both ends of the left front side of the circuit configuration body 12 in FIG. 4, and a PCB connector 41 is interposed between the connector blocks 30, 30. It is arranged.

  A connector block 30 is disposed above the frame 25 at a position near the left end of the frame 25 in FIG. The connector block 30 is screwed to the frame body 25 as shown in FIG. The connector block 30 includes a connector hood 40B that opens to the left in FIG. 7. In this connector hood 40B, one end of the bus bar 29 protrudes into the opening and the other end penetrates the back wall. It is arranged in the state. The mating connector 43 is fitted to the connector hood 40 </ b> B so as to be insertable / removable from the left and right directions in FIG. 7, and an in-vehicle electrical component (not shown) and the end of the bus bar 29 are connected by the wire harness 42.

  A PCB connector 41 is disposed above the frame 25 at a position near the left end of the frame 25 in FIG. The PCB connector 41 is screwed to the frame 25 as shown in FIG. 5 and is also screwed to the circuit board 23 from the side of the circuit board 23 as shown in FIG. 6 (corresponding to the protruding portion according to the present invention). ). The PCB connector 41 includes a connector hood 40C that opens to the left in FIG. 6. In the connector hood 40C, a terminal fitting 43 projects one end into the opening and the other end penetrates the back wall. It is arranged. The side of the terminal fitting 43 that protrudes from the rear wall to the outside of the connector hood 40C is bent downward in FIG. 6 and is connected to the control circuit of the circuit board 23 while penetrating the circuit board 23. A mating connector 43 is fitted into the connector hood 40C of the PCB connector 41 so as to be insertable / removable from the left and right directions in FIG. 6, and the side of the terminal fitting 43 that protrudes into the connector hood 40C of the PCB connector 41 is illustrated. In-vehicle electrical components that are not connected are connected by the wire harness 42.

  As shown in FIG. 6, a sealing material 45 is filled in a region surrounded by the frame body 25 and the heat radiating plate 24. The sealing material 45 is filled so that the circuit board 23 described above is buried, and is also filled in a relief recess 46 described later. As the sealing material 45, for example, an epoxy resin, a urethane resin, or a silicone resin may be a material that can ensure insulation and waterproofness of the electrical connection box 10 by burying and sealing the circuit board 23. Any material can be used.

  The right side wall of the upper case 13 in FIG. 1 is disposed close to the heat radiating plate 24 so as to be opposed to the heat radiating plate 24 of the circuit component 12 over the entire region and to transfer heat from the heat radiating plate 24. In addition, heat is dissipated to the outside of the electrical junction box 10 so that the heat radiating wall portion 17 is formed. As a result, heat generated from the circuit board 23 and the electronic component 27 mounted thereon is transmitted from the heat radiating plate 24 to the heat radiating wall 17 and is dissipated from the heat radiating wall 17 to the outside of the electrical junction box 10.

  The circuit component 12 is inserted into the upper case 13 from the insertion opening 18 of the upper case 13 with the heat sink 24 facing the heat radiating wall 17 and with the PCB connector 41 facing downward. Is inserted from below. When the circuit structure 12 is inserted into a normal position in the upper case 13, the fuse block 19 of the circuit structure 12 is inserted into the fuse block insertion opening 20 of the upper case 13 from below. Further, the lock portion 47 formed at the tip of the mounting portion 19B of the fuse block 19 is elastically engaged with the receiving portion 52 formed at a position corresponding to the lock portion 47 on the side wall of the upper case 13. As a result, the circuit component 12 is prevented from being detached from the upper case 13.

  Of the terminal fittings 43 of the PCB connector 41, a board side end 43A (corresponding to a protruding part according to the present invention) on the side penetrating the circuit board 23, screws 31C for screwing the PCB connector 41 and the circuit board 23, and heat dissipation In order to prevent interference with the plate 24, the heat radiating plate 24 is formed with a relief recess 46 by retracting downward in FIG. 6 at a position corresponding to the substrate side end portion 43A and the screw 31C. Thereby, since the circuit board 23 and the heat sink 24 are closely_contact | adhered, the heat conductivity from the circuit board 23 to the heat sink 24 can be improved. On the other hand, a bulging portion 48 that bulges downward in FIG.

  Further, as shown in FIG. 1, the heat radiating wall portion 17 is formed with a proximity wall portion 60 in which the heat radiating wall portion 17 is brought close to the heat radiating plate 24 in a region other than the bulging portion 48. Thereby, since the heat sink 24 and the heat radiating wall part 17 can be arrange | positioned closely, the heat conductivity from the heat sink 24 to the heat radiating wall part 17 can be improved. Further, a thick wall portion 49 is formed in the adjacent wall portion 60, and heat is transmitted from the wall surface of the heat radiating wall portion 17 facing the heat radiating plate 24 to the outer surface by the thick wall portion 49. Therefore, the heat transfer property of the heat radiating wall 17 is improved.

  Furthermore, according to said method, it can form so that the outer surface side of the thermal radiation wall part 17 may become substantially flat. Thereby, for example, when the electrical connection box 10 is assembled to the vehicle, it is possible to suppress collision between the outer surface of the heat radiating wall portion 17 and various on-vehicle components disposed outside the electrical connection box 10. The efficiency of the attaching work can be improved.

  However, if the thick wall portion 49 is provided in the heat radiating wall portion 17, sink marks may occur depending on the thickness of the thick wall portion 49, and a gap may be generated between the heat radiating plate 24 and the heat radiating wall portion 17. There is a concern that the heat transfer from the plate 24 to the heat radiating wall 17 may be reduced.

  Therefore, in the present embodiment, as shown in FIG. 2, the thick wall portion 49 and the plurality of meat stealing portions 51 of the heat radiating wall portion 17 are intermittently arranged side by side in the horizontal direction in FIG. The meat stealing portion 51 has a substantially rectangular cross section and is formed to extend in a direction penetrating the paper surface in FIG. Thus, first, the formation of the meat stealing portion 51 can prevent sinking in the thick portion 49, so that the heat radiating plate 24 and the heat radiating wall portion 17 can be arranged close to each other. Thereby, the heat conductivity from the heat sink 24 to the heat radiating wall part 17 can be improved. Further, since the meat stealing portion 51 is formed intermittently, the heat is transmitted from the heat radiating plate 24 side through the thick portion 49 left between the meat stealing portions 51 to the heat radiating wall portion 17. Therefore, the heat transfer in the heat radiating wall portion 17 can be prevented from being lowered by the air layer of the meat stealing portion 51. The meat stealing portion 51 can be formed by punching a mold when the upper case 13 is injection molded.

  Further, as shown in FIG. 2, the heat radiating wall portion 17 includes a screw 31A head for screwing the heat radiating plate 24 and the frame body 25 and screws for screwing the heat radiating plate 24 and the fuse block 19 to each other. Screw escape recesses 50 are formed to escape the head of 31B. The screw relief recess 50 is formed corresponding to the movement trajectory of the heads of the screws 31A and 31B when the circuit component 12 is inserted, that is, the upper case 13 in FIG. It is formed from the edge of the insertion opening 18 formed on the lower side to a position corresponding to the heads of the screws 31A and 31B of the circuit component 12 inserted in the normal position in the upper case 13. Further, as described above, the screws 31 </ b> A and 31 </ b> B are arranged in a row along the insertion direction of the circuit structure 12 into the upper case 13. Accordingly, since the heads of the plurality of screws 31A and 31B can be accommodated in the screw escape recess 50, for example, compared to a configuration in which only one screw is accommodated in the screw escape recess 50, the screw escape The number of the concave stripes 50 can be reduced. Thereby, since a larger area of the heat radiating portion can be brought close to the heat radiating wall portion 17, heat transfer from the heat radiating plate 24 to the heat radiating wall portion 17 can be improved.

Next, functions and effects of this embodiment will be described.
From the insertion opening 18 of the upper case 13, the circuit component 12 is inserted in a posture in which the bulging portion 48 is located on the rear side in the insertion direction and the heat radiating plate 24 faces the heat radiating wall portion 17. When the circuit component 12 is inserted to the normal position in the upper case 13, the lock portion 47 of the fuse block 19 engages with the receiving portion of the upper case 13, and the circuit component 12 is detached from the upper case 13. Stopped. Then, the heads of the screws 31 </ b> A and 31 </ b> B protruding from the heat radiating plate 24 are accommodated in the screw escape recesses 50 of the heat radiating wall portion 17. Further, due to the proximity wall 60 formed in the heat radiating wall 17, the heat radiating plate 24 and the heat radiating wall 17 are disposed close to each other in a region other than the bulging portion 48. Thereby, since the heat sink 24 and the heat radiating wall part 17 can be arrange | positioned closely, the heat conductivity from the heat sink 24 to the heat radiating wall part 17 can be improved, and the electrical junction box 10 becomes high temperature locally. Can be prevented. Furthermore, since the thick wall part 49 is formed in the proximity wall part 60, the heat transfer property of the heat radiating wall part 17 can be improved.

  When the circuit component 12 is inserted into a normal position in the upper case 13, the lower case 15 is assembled from below so as to cover the insertion opening 18 of the upper case 13. Then, the engaging part 33 of the lower case 15 engages with the engaging part 32 of the frame 25 from below, and the engaging part 32 is sandwiched from the left and right directions in FIG. The unit 17 is held so as not to leave. Thereby, the heat conductivity from the circuit structure 12 to the heat radiating wall part 17 can be improved. At this time, the lower end edge of the upper case 13 contacts the flange 16 of the lower case 15 from above.

  When the upper case 13 and the lower case 15 are assembled, the cover 14 is attached from above so as to cover the upper surface of the upper case 13. Then, the waterproof protrusion 22 of the upper cover 14 is fitted into the waterproof groove 21 of the cover 14 so that the cover 14 is detachably and liquid-tightly attached to the upper case 13. As described above, since the entire circuit structure 12 is covered with the casing 11 including the upper case 13, the lower case 15, and the cover 14, the waterproof property of the electrical junction box 10 can be improved.

  Furthermore, in the present embodiment, the electrical junction box 10 is arranged so that the insertion opening 18 is on the bottom, so that rain water, water at the time of car washing, etc. enter the casing 11 from the insertion opening 18. Can be prevented, and the waterproofness of the electrical junction box 10 can be improved.

<Other embodiments>
The present invention is not intended to be limited to the embodiments described above with reference to the drawings, it can be implemented with various modifications within a scope not departing from the Abstract.

Side sectional view of the electrical junction box according to the present embodiment A cross-sectional view of the electrical junction box Perspective view of circuit structure FIG. 3 is a perspective view of a circuit structure viewed from a direction different from FIG. Partially enlarged exploded perspective view of the circuit structure AA line sectional view in FIG. BB sectional view in FIG. Bottom view of circuit structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Electrical junction box 11 ... Casing 13 ... Upper case (casing)
14 ... Cover (casing)
15 ... Lower case (casing)
17 ... Radiating wall 23 ... Circuit board 24 ... Radiating plate 31C ... Screw (projection)
43A ... Board side end (projection)
46 ... Escape concave portion 48 ... Swelling portion 49 ... Thick portion 51 ... Meat stealing portion 60 ... Proximity wall portion

Claims (1)

A circuit board is formed by laminating a heat sink on a circuit board, and the heat sink has a circuit structure in which a relief recess for escaping the protruding part of the circuit board bulges away from the circuit board. In the electrical junction box that is housed,
The casing is provided with a heat radiating wall portion facing the heat radiating plate for receiving heat from the heat radiating plate and dissipating it to the outside of the casing.
Wherein the heat radiating wall, provided with the relief proximity wall portion where the region other than the concave portion is closer to the radiator plate of the heat radiating plate Rutotomoni,
The heat radiating wall portion is formed so as to be substantially flat on the outer surface side of the casing, and on the inner surface side of the casing, a thick portion is provided at a position corresponding to the proximity wall portion,
At least the heat radiating wall portion of the casing is formed by injection molding of synthetic resin, and a plurality of meat stealing portions are intermittently formed in the thick portion of the heat radiating wall portion. Electrical junction box.

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