JP2010283909A - Electrical junction box - Google Patents

Abstract

An electrical junction box that can reduce the number of parts and can be easily assembled is provided.
An electrical junction box includes an upper cover to which an electrical component assembly composed of a plurality of electrical components is attached, and a lower cover that is attached to the upper cover and covers the lower surface of the electrical component assembly. And a plurality of electric wires 4 attached to the lower surface of the electric component assembly 8, and an electric wire outlet 5 through which the electric wires 4 are drawn out. The frame-shaped first peripheral wall 21 of the upper cover 2 extends below the lower surface of the electrical component assembly 8. The electric wire outlet 5 is formed in a concave shape from the first concave groove 51 formed concave from the lower end 21a of the first peripheral wall 21 and the upper end 31a of the frame-shaped second peripheral wall 31 of the lower cover 3. And a second concave groove 52 which is combined with the concave groove 51 to form one hole.
[Selection] Figure 1

Description

  The present invention relates to an electric junction box attached to an engine room of an automobile.

  A variety of electronic devices are mounted on automobiles. In order to supply power to these various electronic devices, the automobile has a power distribution unit and electrical components such as fuses and relays integrated at appropriate locations between the power source and the electronic devices. An electrical junction box is disposed (see, for example, Patent Document 1).

  The electrical junction box is also called a junction block, a fuse block, or a relay box. In the present specification, the junction block, the fuse block, and the relay box described above are collectively referred to as an electric connection box.

  Various types of electrical junction boxes are used depending on the vehicle type. For example, an electrical component assembly 208 composed of a plurality of electrical components is attached as in the electrical junction box 201 shown in FIGS. The upper cover 202, the lower cover 203 attached to the upper cover 202 and covering the lower surface of the electrical component assembly 208, the slide cover 210, and the plurality of electric wires 204 attached to the lower surface of the electrical component assembly 208. Some have an electric wire outlet 205 through which the electric wire 204 is drawn out.

  3 and 4 indicate the direction parallel to the vertical direction and the height direction of the electrical junction box 201, and the arrow X indicates the electrical junction box 201 orthogonal to the arrow Y. The arrow Z indicates the width direction of the electrical junction box 201 orthogonal to the arrows Y and X.

  The lower cover 203 includes a frame-shaped peripheral wall 231, a plurality of lock portions 206 that are provided on the peripheral wall 231 and are respectively engaged with a plurality of lock receiving portions 207 provided on the upper cover 202, and an upper end of the peripheral wall 231. A concave groove 232 formed in a concave shape and a semi-cylindrical protruding portion 233 protruding from the bottom 232a of the concave groove 232 to the outside of the lower cover 203 are provided. Further, an extra clearance is set between the lock receiving portion 207 and the lock portion 206 so that the lock receiving portion 207 and the lock portion 206 are securely locked, that is, in order to ensure that the lock is lowered.

  The slide cover 210 is formed in a plate shape and is attached to the groove 232 of the lower cover 203, a semi-cylindrical protrusion 212 protruding from the lower end 211a of the plate 211 to the outside of the lower cover 203, And a lock portion 213 that engages with the peripheral wall 231 of the lower cover 203. Further, the lower end 211a of the plate portion 211 forms a hole with a gap between the lower end 211a and the bottom portion 232a of the concave groove 232.

  The wire outlet 205 includes a hole formed between the bottom 232a of the groove 232 and the lower end 211a of the plate 211, a semi-cylindrical protrusion 233, a semi-cylindrical protrusion 212, It consists of The semicylindrical protrusion 233 and the semicylindrical protrusion 212 are combined with each other to form a cylinder. As shown in FIG. 4, the bundle of the electric wires 204 passed through the electric wire outlet 205 has a slight gap between the lower end 211 a of the plate portion 211 and the protruding portion 212.

  When assembling the electrical junction box 201 described above, a plurality of electric wires 204 attached to the lower surface of the electrical component assembly 208 are attached to the lower cover without the upper cover 202 and the lower cover 203 attached with the electrical component assembly 208 being assembled. The slide cover 210 is attached to the recessed groove 232 so that the bundle of the electric wires 204 is sandwiched between the protruding portion 233 along the recessed groove 232 and the protruding portion 233 of 203, and the lock portion 213 is locked. Then, the upper cover 202 and the lower cover 203 are assembled, and finally, tuning is performed to reduce the excess clearance between the lock receiving portion 207 of the upper cover 202 and the lock portion 206 of the lower cover 203 while checking the state of the molded product. To assemble the electrical junction box 201. Further, the tuning is a work necessary for eliminating the backlash between the upper cover 202 and the lower cover 203.

JP 2000-236611 A

  However, since the electrical junction box 201 described above has a large number of parts such as the upper cover 202, the lower cover 203, and the slide cover 210, the number of assembly processes increases, and the number of molding dies for molding them increases. there were.

  The electrical junction box 201 described above has a lock portion 213 for fixing the slide cover 210 to the lower cover 203 in addition to the lock receiving portion 207 and the lock portion 206 for fixing the upper cover 202 and the lower cover 203. Since there are many lock parts, there existed a problem that the number of assembly processes was large and dismantling was difficult.

  In Patent Document 1, an electrical junction box is disclosed in which the slide cover is integrally provided on the upper cover. However, in the electrical junction box, the slide cover extends from the lower end of the upper cover. Therefore, there is a problem that the depth of the molding die for molding the upper cover, that is, the dimension along the arrow Y is increased, and the manufacturing cost is increased.

  Furthermore, the electrical junction box 201 described above has to be tuned to reduce the excess clearance between the lock receiving portion 207 and the lock portion 206 described above, which is very time consuming and troublesome. It was.

  Therefore, an object of the present invention is to provide an electrical junction box that can reduce the number of parts and can be easily assembled.

  In order to achieve the above object, an invention described in claim 1 includes an upper cover to which an electrical component assembly composed of a plurality of electrical components is attached, and a lower surface of the electrical component assembly attached to the upper cover. And a plurality of electric wires attached to the lower surface of the electrical component assembly are drawn out through an electric wire outlet provided between the upper cover and the lower cover. In the electrical junction box, the upper cover has a frame-shaped first peripheral wall that surrounds a side surface of the electrical component assembly and extends below the lower surface of the electrical component assembly, and the lower cover includes The second peripheral wall having a frame shape overlapped with the first peripheral wall, and the wire outlet is a first groove formed in a recess from a lower end of the first peripheral wall, and the first Concave from the top of the peripheral wall of 2 By an electrical connection box, characterized in that it has a second groove constituting one hole aligned with said first groove.

  The invention described in claim 2 is the invention described in claim 1, wherein the height of the second peripheral wall is formed smaller than the height of the first peripheral wall, and the electric wire is connected to the lower cover. The electric component assembly is in contact with the lower wall facing the lower surface of the assembly.

  The invention described in claim 3 is the invention described in claim 1 or 2, wherein the height of the second peripheral wall is smaller than the height of the first peripheral wall, and the electric wire The bundle of electric wires passed through the outlet is in contact with the inner edge of the first groove and the inner edge of the second groove.

  According to the first aspect of the present invention, the upper cover has a frame-shaped first peripheral wall that surrounds the side surface of the electrical component assembly and extends downward from the lower surface of the electrical component assembly. The lower cover has a frame-shaped second peripheral wall that overlaps the first peripheral wall, and the wire outlet is formed in a concave shape from the lower end of the first peripheral wall. And a second concave groove formed in a concave shape from the upper end of the second peripheral wall and combined with the first concave groove to form one hole. It is possible to provide an electrical junction box that can eliminate the slide cover, reduce the number of parts, and can be easily assembled and disassembled.

  According to the invention described in claim 2, the height of the second peripheral wall is smaller than the height of the first peripheral wall, and the electric wire is a lower surface of the electric component assembly of the lower cover. The upper cover is pushed up in the direction away from the lower cover due to the tension of the electric wire, and therefore there is an extra clearance set in the locking means for fixing the upper cover and the lower cover. Therefore, tuning for reducing the extra clearance of the locking means is not necessary. In addition, the electric wire acts as a damper to mitigate vibrations and shocks applied to the electric junction box. Therefore, it is possible to provide an electrical junction box that can be more easily assembled and can improve vibration resistance and shock resistance.

  According to the invention described in claim 3, the height of the second peripheral wall is formed smaller than the height of the first peripheral wall, and the bundle of electric wires that pass through the electric wire outlet is, Since it is in contact with the inner edge of the first groove and the inner edge of the second groove, the upper cover is pushed up in the direction away from the lower cover due to the tension of the electric wire, and therefore the upper cover and the lower cover are fixed. Since the extra clearance set for the lock means is eliminated, tuning for reducing the extra clearance of the lock means becomes unnecessary. In addition, the electric wire acts as a damper to mitigate vibrations and shocks applied to the electric junction box. Therefore, it is possible to provide an electrical junction box that can be more easily assembled and can improve vibration resistance and shock resistance.

It is an exploded view of the electrical junction box concerning one embodiment of the present invention. It is sectional drawing along the AA line in FIG. It is an exploded view of the conventional electrical junction box. It is sectional drawing along the BB line in FIG.

  An electrical junction box according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  The electric junction box 1 of the present invention is attached to an engine room of an automobile and supplies electric power to various electronic devices mounted on the automobile. In the present specification, the junction block, the fuse block, and the relay box are collectively referred to as an “electric connection box”.

  As shown in FIGS. 1 and 2, the electrical junction box 1 includes an upper cover 2 to which an electrical component assembly 8 composed of a plurality of electrical components is attached, and an electrical component assembly 8 attached to the upper cover 2. The lower cover 3 that covers the lower surface 8a of the electric component assembly and the electric wire outlet 5 through which the plurality of electric wires 4 attached to the lower surface 8a of the electrical component assembly 8 are passed and drawn out.

  1 and 2 indicate the direction parallel to the vertical direction and the height direction of the electrical junction box 1, and the arrow X indicates the electrical junction box 1 orthogonal to the arrow Y. The arrow Z indicates the width direction of the electrical junction box 1 orthogonal to the arrows Y and X. In the present invention, the “vertical direction” means the arrow Y direction, that is, the height direction of the electrical junction box 1, and “up” is the upper side in the paper direction of the arrow Y direction in FIGS. 1 and 2. The lower side in the paper direction in the arrow Y direction with respect to this “upper” is expressed as “lower”.

  The electrical component assembly 8 is formed in a substantially block shape by mounting a plurality of electrical components such as relays, fuses, and connectors on a frame. A plurality of electric wires 4 having terminals 9 attached to the terminals are attached to the lower surface 8a of the electrical component assembly 8.

  The upper cover 2 is made of synthetic resin and is formed by well-known injection molding. As shown in FIG. 1, the upper cover 2 is erected in a frame shape from the upper wall 20 formed in a rectangular plate shape and the outer edge of the upper wall 20, and surrounds the side surface 8 b of the electrical component assembly 8. The first peripheral wall 21, the plurality of lock receiving portions 7 provided on the lower end 21 a of the first peripheral wall 21, and respectively locked to the later-described plurality of lock portions 6 provided on the lower cover 3, and the first peripheral wall 21 has a first concave groove 51 formed in a concave shape from the lower end 21a, and a semi-cylindrical protruding portion 53 that protrudes from the inner edge of the first concave groove 51 to the outside of the upper cover 2. . As shown in FIG. 2, the lower end 21 a of the first peripheral wall 21 is positioned below the lower surface 8 a of the electrical component assembly 8.

  The lower cover 3 is made of a synthetic resin and is formed by a known injection molding. As shown in FIG. 1, the lower cover 3 includes a lower wall 30 that is formed in a rectangular plate shape, facing the upper wall 20, that is, facing the lower surface 8 a of the electrical component assembly 8, and an outer edge of the lower wall 30. And a plurality of lock portions 6 provided on the second peripheral wall 31 and locked on the plurality of lock receiving portions 7 described above. And a flange fixed to the vehicle body of the automobile, and a second groove formed in a recess from the upper end 31a of the second peripheral wall 31 and combined with the first groove 51 to form one round hole 52 and a semi-cylindrical protrusion 54 that protrudes from the inner edge of the second concave groove 52 to the outside of the lower cover 3. Further, the height H2 of the second peripheral wall 31 is formed to be smaller than the height H1 of the first peripheral wall 21.

  Further, the upper cover 2 and the lower cover 3 are fixed to each other by the locking portion 6 and the lock receiving portion 7 being locked. An extra clearance is set between the lock portion 6 and the lock receiving portion 7 so that the lock portion 6 and the lock receiving portion 7 are securely locked, that is, in order to surely drop the lock.

  The electric wire outlet 5 includes a round hole constituted by the first concave groove 51 and the second concave groove 52, a semi-cylindrical protrusion 53, and a semi-cylindrical protrusion 54. It is configured. The semicylindrical protrusion 53 and the semicylindrical protrusion 54 are combined with each other to form a cylinder.

  Furthermore, as shown in FIG. 2, the bundle of electric wires 4 bundled in one bundle and passed through the electric wire outlet 5 and drawn to the outside of the electric connection box 1 is below the lower cover 3 in the electric connection box 1. While being in contact with the wall 30, it is in contact with the inner edge of the first groove 51, the inner edge of the second groove 52, the inner surface of the protrusion 53, and the inner surface of the protrusion 54. And by these things, that is, by the tension of the electric wire 4, the upper cover 2 is pushed up in a direction away from the lower cover 3 (a direction from the lower side to the upper side along the arrow Y). Further, when the upper cover 2 is pushed up in the direction away from the lower cover 3, there is no excess clearance in the arrow Y direction set in the lock portion 6 and the lock receiving portion 7 that fix the upper cover 2 and the lower cover 3. . For this reason, in this electrical junction box 1, “tuning” for reducing the extra clearance between the lock portion 6 and the lock receiving portion 7 becomes unnecessary. Further, the lower wall 30 of the lower cover 3, the inner edge of the first concave groove 51, the inner edge of the second concave groove 52, the inner surface of the protruding portion 53, and the plurality of electric wires 4 in contact with the inner surface of the protruding portion 54 are It works to relieve vibrations and shocks applied to the electrical junction box 1.

  When assembling the electrical junction box 1 described above, the plurality of electric wires 4 attached to the lower surface 8a of the electrical component assembly 8 are not assembled with the upper cover 2 and the lower cover 3 to which the electrical component assembly 8 is attached. The lower cover 3 is assembled to the upper cover 2 so that the bundle of the electric wires 4 is sandwiched between the first concave groove 51 and the projecting portion 53 along the first concave groove 51 and the projecting portion 53.

  Thus, the electrical junction box 1 of the present invention can reduce the number of parts and the lock locations by eliminating the conventional slide cover (210), and can be easily assembled and disassembled. Further, the number of molding dies for molding the upper cover 2 and the lower cover 3 can be reduced.

  In addition, the electrical junction box 1 of the present invention has a height H2 of the second peripheral wall 31 of the lower cover 3 in order to omit “tuning” that reduces the extra clearance between the lock portion 6 and the lock receiving portion 7. By forming it smaller than the height H1 of the first peripheral wall 21 of the upper cover 2, that is, by forming the depth of the lower cover 3, the bundle of the electric wires 4 is bundled with the lower wall 30 of the lower cover 3 or the first The upper cover 2 is removed from the lower cover 3 by the tension of the electric wires 4 so as to positively contact the inner edge of the groove 51, the inner edge of the second groove 52, the inner surface of the protruding portion 53, and the inner surface of the protruding portion 54. It pushes up in the direction of leaving | separating so that the excess clearance of the arrow Y direction set to the lock part 6 and the lock | rock receiving part 7 may be eliminated. Therefore, it can assemble more easily and can improve vibration resistance and impact resistance.

  Further, in the above-described embodiment, in order to omit “tuning” for reducing the extra clearance between the lock portion 6 and the lock receiving portion 7, the bundle of the wires 4 is connected to the lower wall 30 of the lower cover 3, the first concave portion. The inner edge of the groove 51, the inner edge of the second recessed groove 52, the inner surface of the protruding portion 53, the inner surface of the protruding portion 54 are brought into contact with each other, and the upper cover 2 is pushed up in the direction away from the lower cover 3 by the tension of these electric wires 4. Although the extra clearance in the arrow Y direction set in the lock portion 6 and the lock receiving portion 7 is eliminated, in the present invention, the plurality of electric wires 4 are connected to the “lower wall 30 of the lower cover 3” and the “first cover”. The contact with at least one of the inner edge of the concave groove 51 and the inner edge of the second concave groove 52 is effective in eliminating the extra clearance.

  In the above-described embodiment, the upper cover 2 has the “upper wall 20” and the “peripheral wall 21”. However, in the present invention, the upper cover surrounds “the side surface 8b of the electrical component assembly 8”. In addition, it is only necessary to have at least the frame-shaped first peripheral wall 21 ”extending downward from the lower surface 8 a of the electrical component assembly 8. That is, in the present invention, the upper cover may be formed in a frame shape, and may further include another cover that covers the opening on the upper surface side of the upper cover.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Electrical junction box 2 Upper cover 3 Lower cover 4 Electric wire 5 Electrical wire outlet 8 Electrical component assembly 8a Lower surface 8b Side surface 21 First peripheral wall 21a Lower end 30 Lower wall 31 Second peripheral wall 31a Upper end 51 First concave groove 52 Second Groove

Claims (3)

An upper cover to which an electrical component assembly composed of a plurality of electrical components is attached; and a lower cover attached to the upper cover and covering the lower surface of the electrical component assembly; and on the lower surface of the electrical component assembly In the electrical junction box in which a plurality of attached electric wires are drawn out through an electric wire outlet provided between the upper cover and the lower cover,
The upper cover has a frame-shaped first peripheral wall that surrounds a side surface of the electrical component assembly and extends downward from a lower surface of the electrical component assembly;
The lower cover has a frame-shaped second peripheral wall that overlaps the first peripheral wall;
The wire outlet is formed in a concave shape from the lower end of the first peripheral wall and in a concave shape from the upper end of the second peripheral wall, and is combined with the first concave groove 1 An electrical junction box comprising: a second concave groove that constitutes one hole.   The height of the second peripheral wall is formed smaller than the height of the first peripheral wall, and the electric wire is in contact with the lower wall of the lower cover facing the lower surface of the electrical component assembly. The electrical junction box according to claim 1, wherein   The height of the second peripheral wall is smaller than the height of the first peripheral wall, and the bundle of electric wires that pass through the electric wire outlet is the inner edge of the first groove and the second The electrical connection box according to claim 1, wherein the electrical connection box is in contact with an inner edge of the concave groove.

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