JP6868502B2 - Electrical junction box - Google Patents

Description

The present invention relates to an electrical junction box having a structure for waterproofing.

In automobiles, electric junction boxes that house various electrical components of automobiles such as fuses and relays together with electronic boards are used. This electric junction box mounted on the vehicle is provided with a waterproof structure to prevent water from entering the inside in rainy weather or when washing the car. Patent Documents 1 and 2 disclose a waterproof structure of this type of electrical junction box.

In the waterproof structure of the electrical junction box of Patent Document 1, the flange portion of the grommet that fits into the guide portion of the case of the electrical junction box is integrally formed in at least two stages, and the second flange portion in the inner direction of the case is outside the case. It is formed larger in the height direction and the width direction than the first flange portion in the direction, the upper portion of the flange portion is projected higher than the guide portion, and the upper portion is brought into close contact with the packing in the cover.

The waterproof structure of the electrical junction box of Patent Document 2 includes a case body and a lower cover to which the lower part of the case body can be joined, and is above the grommet that fits into the notch formed in the lower cover and under the case body. The ribs that hold the packing provided on the side are projected.

JP-A-2002-369334 Japanese Unexamined Patent Publication No. 2001-251724

However, in the configurations of Patent Documents 1 and 2, only one grommet is provided. Therefore, the place where the electric wire is pulled out is limited, and it cannot be said that the wiring of the electric wire is always easy. On the other hand, when the configurations of Patent Documents 1 and 2 are changed so as to have a plurality of grommets, it is necessary to secure a good waterproof function and assembleability while the configuration becomes complicated, and there is room for improvement in this respect. It had been.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric junction box having good waterproofness and assembling property.

Means and effects to solve problems

The problem to be solved by the present invention is as described above, and next, the means for solving this problem and its effect will be described.

From the viewpoint of the present invention, an electrical junction box having the following configuration is provided. That is, the electrical junction box includes a case body, a first cover, a second cover, and a grommet. A storage space for accommodating electrical components is formed in the case body. The first cover is fixed to the case body. The second cover is fixed to the case body via the case body so as to face the first cover. Electric wires can pass through the grommet. Of the walls arranged so as to surround the accommodation space in the case body, recesses are formed in both the first wall and the second wall arranged facing or adjacent to the first wall. Has been done. The recess formed in the first wall is opened on the side close to the first cover. The recess formed in the second wall is opened on the side close to the second cover. The grommet is arranged in an opening formed from each of the recesses and the first cover or the second cover.

As a result, the electric wires can be sorted and pulled out from the electric junction box in various directions, so that it is possible to easily cope with a complicated electric wire layout. Further, when the grommet is arranged on the surface where the case body and the cover are joined, the arrangement place tends to be a weak point in waterproofing, but in the present embodiment, the direction of the opening side of the recess is the first wall and the second wall. Since it is the opposite of the above, it is possible to effectively suppress the deterioration of the waterproof performance. Further, since the work of attaching the grommet to the first wall and the work of attaching the grommet to the second wall can be easily separated, the assembly work can be flexibly shared.

The electrical junction box is preferably configured as follows. That is, this electrical junction box includes a first packing and a second packing. The first packing is arranged between the case body and the first cover. The second packing is arranged between the case body and the second cover. The first packing is sandwiched between the grommet and the first cover in the recess formed in the first wall. The second packing is sandwiched between the grommet and the second cover in the recess formed in the second wall.

As a result, the case body and the first cover or the second cover can be satisfactorily waterproofed by the composite waterproof structure of the packing and the grommet.

In the electrical junction box, it is preferable that the first wall and the second wall are vertically connected to each other.

This makes it easier to pull the wires out of the electrical junction box in various directions.

In the electrical connection box, it is preferable that a plurality of the recesses are formed in at least one of the first wall and the second wall.

As a result, it is possible to realize a layout in which the electric wires are pulled out from a plurality of locations on one wall.

In the electrical connection box, the first cover or the first cover that closes a portion in which the recess is open between the plurality of recesses formed in at least one of the first wall and the second wall. It is preferable that a screw fixing portion for joining the second cover and the case body is provided.

This allows the wires to be pulled out from multiple locations on one wall. Further, since it is possible to make it difficult for the tightening force applied from the first cover or the second cover to be biased with respect to a plurality of grommets arranged at the place where the electric wire is pulled out, it is possible to improve the waterproof performance as a whole. Can be done.

The electrical junction box is preferably configured as follows. That is, the electrical junction box includes an inner member arranged inside the grommet. Ribs are formed on the outer circumference of the inner member. A groove is formed on the inner wall of the recess. The rib and the groove face each other with the grommet in between.

Thereby, the inward deformation of the grommet due to an external force or the like can be prevented by the rib of the inner member. Therefore, the waterproof performance can be stably exhibited.

The electrical junction box is preferably configured as follows. That is, a lip portion is formed on the outer periphery of the grommet at a position corresponding to the rib of the inner member. The lip portion comes into contact with the inner wall of the groove formed in the recess while being crushed.

As a result, strong waterproofing can be realized at the lip portion.

In the electrical connection box, it is preferable that the concave portion is formed in a connection convex portion provided so as to project outward from the case body.

As a result, the grommet is less likely to protrude into the case body, so that a large accommodation space can be secured.

The electrical junction box is preferably configured as follows. That is, the first cover is fixed to the lower side of the case body. The recess provided in the first wall is formed larger than the recess provided in the second wall.

Thereby, for example, it is possible to realize a layout in which a thick trunk line wire bundle is pulled out from the lower part of the first wall and a thin branch line wire bundle is pulled out from the second wall.

The electrical junction box is preferably configured as follows. That is, in the recess, the portion facing the first cover or the second cover that closes the portion where the recess is opened is rounded. The grommet is configured to have a rounded shape corresponding to the roundness.

As a result, it is possible to reduce the angular portion that tends to be a weak point in waterproofing, so that the waterproof performance can be improved.

In the electrical connection box, it is preferable that either the first cover or the second cover is fixed to the upper side of the case body, and the upper cover is provided with a ventilation waterproof structure. ..

This makes it possible to prevent changes in the pressure inside the electrical junction box. In addition, the heat generated inside the electrical junction box can be easily released to the outside through the upper ventilation waterproof structure.

The exploded perspective view which shows the overall structure of the electric junction box which concerns on one Embodiment of this invention. An enlarged perspective view showing a state in which a grommet is arranged in an opening formed from a case body and a lower cover. The perspective view which shows the structure of the lower cover. The perspective view which shows the structure of the upper cover. A cross-sectional perspective view showing how the grommet contacts the inner wall of the recess. An enlarged perspective view showing the work of inserting the grommet into the recess.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing the overall configuration of the electrical connection box 1 according to the embodiment of the present invention.

The electrical junction box 1 shown in FIG. 1 is used to house an electronic board 95 on which various electrical components of a car are mounted. The electrical connection box 1 mainly includes a case main body 10, a lower cover (first cover) 3, an upper cover (second cover) 4, and grommets 2, 2a, 2b. The case body 10, the lower cover 3 and the upper cover 4 are formed by injection molding a synthetic resin.

The electric wire 80 connected to the electronic substrate 95 is drawn out from the inside of the electric connection box 1 via any one of a plurality of grommets 2, 2a, 2b attached to the case body 10. The electric wire 80 passes through the openings of the grommets 2, 2a and 2b, is pulled out from the electric junction box 1, and is connected to various electric devices mounted on the vehicle via the illustrated connector fixed to the end thereof. Will be done.

The case body 10 has a shape in which both sides in the vertical direction are open. The lower side of the case body 10 is closed by the lower cover 3, and the upper side is closed by the upper cover 4. The lower cover 3 and the upper cover 4 are joined to the case body 10 by tightening a plurality of screws 96.

A lower packing (first packing) 103 is provided between the case main body 10 and the lower cover 3, and an upper packing (second packing) 104 is provided between the case main body 10 and the upper cover 4. The lower packing 103 is formed in a loop shape and is arranged on the outer peripheral portion at the joint portion between the case body 10 and the lower cover 3. The upper packing 104 is also formed in a loop shape, and is arranged on the outer peripheral portion at the joint portion between the case body 10 and the upper cover 4. As a result, the space between the case body 10 and the lower cover 3 and the space between the case body 10 and the upper cover 4 can be sealed.

The case body 10 includes a first wall 11, a second wall 12, a third wall 13, and a fourth wall 14, all of which are formed in a substantially flat plate shape.

The first wall 11, the second wall 12, the third wall 13, and the fourth wall 14 are arranged so as to form a rectangle in a plan view so as to surround the space (accommodation space 85 described later). The first wall 11 and the third wall 13 correspond to the long sides of the rectangle and are arranged in parallel so as to face each other. The second wall 12 and the fourth wall 14 correspond to the short sides of the rectangle and are arranged in parallel so as to face each other.

The first wall 11 is connected vertically to the second wall 12 at one end and vertically to the fourth wall 14 at the other end.

The second wall 12 is connected vertically to the first wall 11 at one end and vertically to the third wall 13 at the other end.

The third wall 13 is vertically connected to the second wall 12 at one end and vertically connected to the fourth wall 14 at the other end.

The fourth wall 14 is connected vertically to the third wall 13 at one end and vertically to the first wall 11 at the other end.

As described above, by connecting the four walls to each other, the accommodation space 85 in the case body 10 is formed. The electronic substrate 95 can be accommodated in the accommodation space 85.

The configuration of the first wall 11 will be described. The first wall 11 has two connecting convex portions 5 capable of connecting the grommet 2, a first lower screwed portion 31 and a second lower screwed portion 32 used for joining the lower cover 3. A first upper screwed portion 41 used for joining with the upper cover 4 is provided.

Each of the two connecting protrusions 5 is formed so as to project outward from the case body 10. The direction in which the connecting convex portion 5 protrudes from the first wall 11 is a direction perpendicular to the first wall 11 and a direction perpendicular to the direction in which the case main body 10 and the lower cover 3 are joined.

Two connecting convex portions 5 are formed on the first wall 11 at intervals from each other. Each of the two connecting convex portions 5 is formed with a U-shaped concave portion 7 having an open lower side.

With this configuration, the grommet 2 through which the electric wire 80 has passed is slid and fitted into each recess 7, and the lower cover 3 is fixed to the case body 10 in this state. As a result, as shown in FIG. 2, the grommet 2 is arranged in the opening 70 formed by closing the portion where the recess 7 is opened with the lower cover 3, and the grommet 2 is not disengaged from the opening 70. Can be fixed to. Further, by tightening the screw 96 that fixes the lower cover 3 to the case body 10, the edge portion of the grommet 2 comes into close contact with the surroundings, whereby waterproofing can be realized.

The portion of the grommet 2 sandwiched between the case body 10 and the lower cover 3 (fitting portion 20 described later) has an elongated rectangular shape in the vertical direction. Of the four rectangular corners of this part, the two corners closer to the case body 10 are largely rounded, while the two corners closer to the lower cover 3 are slightly rounded. .. Correspondingly, the recess 7 is a rectangular recess elongated in the vertical direction, and the two corners located at the portions facing the lower cover 3 are greatly rounded. As a result, it is possible to eliminate the angular portion, which is a weak point in waterproofing, and to prevent water from entering satisfactorily.

In the first wall 11, the inner wall of the recess 7 is formed with a first groove 71, a second groove 72, and a third groove 73 in this order from the outside to the inside of the case body 10. The first groove 71, the second groove 72, and the third groove 73 are all formed as elongated grooves along the U-shaped recess 7, and are arranged in parallel with each other.

The first upper screwed portion 41 is arranged at the upper end portion of the first wall 11.

The first lower screw fastening portion 31 is provided at the lower end portion of the first wall 11. Further, the first lower screw fastening portion 31 is arranged between the two connecting convex portions 5a and 5b when viewed in the vertical direction (that is, the direction in which the case body 10 and the lower cover 3 are joined). .. By providing the first lower screw fixing portion 31 between the two connecting convex portions 5 in this way, when tightening the screw 96, the tightening force is applied to the two grommets 2 without being biased to any of the grommets 2. It becomes easy to work evenly. As a result, the overall sealing property can be improved.

The second lower screwed portion 32 is provided at the lower end portion of the first wall 11. The second lower screwed portion 32 is located in the vicinity of the portion where the first wall 11 and the second wall 12 are connected, and is arranged in the vicinity of the connecting convex portion 5b shown in FIG.

The configuration of the second wall 12 will be described. The second wall 12 is provided with two second connecting convex portions 6 capable of connecting the grommets 2a and 2b, and a second upper screwing portion 42 used for joining the upper cover 4. There is.

Each of the second connecting convex portions 6 is formed so as to project outward from the case body 10. The direction in which the second connecting convex portion 6 protrudes from the second wall 12 is a direction perpendicular to the second wall 12 and a direction perpendicular to the direction in which the case body 10 and the upper cover 4 are joined. .. Further, the direction in which the second connecting convex portion 6 protrudes is perpendicular to the direction in which the connecting convex portion 5 protrudes from the first wall 11.

Two second connecting convex portions 6 are formed on the second wall 12 at intervals from each other. Each of the two second connecting convex portions 6 is formed with a U-shaped concave portion 7 having an open upper side.

As a result, the grommets 2a and 2b through which the electric wire 80 has passed are slid and fitted into the respective recesses 7 from above, and the upper cover 4 is fixed to the case body 10 in this state, whereby the recesses 7 are opened. Can be closed with the upper cover 4 so that the grommets 2a and 2b do not come off from the recess 7. Further, by tightening the screw 96 that fixes the upper cover 4 to the case body 10, the edges of the grommets 2a and 2b are brought into close contact with the surroundings, whereby waterproofing can be realized.

The portion where the grommets 2a and 2b are sandwiched between the case body 10 and the upper cover 4 has an elongated rectangular shape in the vertical direction. The four corners of the rectangle of this part are all slightly rounded. Correspondingly, the concave portion 7 is formed as a rectangular concave portion elongated in the vertical direction, and two corners located at a portion facing the upper cover 4 are provided with small roundness. As a result, it is possible to eliminate the angular portion, which is a weak point in waterproofing, and to prevent water from entering satisfactorily.

In the second wall 12, the inner wall of the recess 7 is formed with a first groove 71 and a second groove 72 in this order from the outside to the inside of the case body 10. The first groove 71 and the second groove 72 are both formed as U-shaped elongated grooves, and are arranged in parallel with each other.

As described above, in the present embodiment, the first wall 11 is provided with the recess 7, and the second wall 12 connected vertically to the first wall 11 is also provided with the recess 7. Further, a plurality of recesses 7 are provided in both the first wall 11 and the second wall 12. This makes it easy to divide the electric wire 80 into a plurality of parts and pull them out in various directions in consideration of the layout of the electric equipment in the vehicle.

Further, in the present embodiment, the first wall 11 and the second wall 12 are configured so that the orientations of the recesses 7 on the open side are opposite to each other. That is, the recess 7 provided in the first wall 11 is opened toward the lower cover 3. The recess 7 provided in the second wall 12 is opened toward the upper cover 4 (arranged on the side opposite to the lower cover 3 when viewed from the case body 10). By allocating the direction of the open side of the recess 7 to each wall in this way, it is possible to avoid centralized arrangement of places where waterproofing is difficult and improve the waterproof performance as a whole.

Since the second wall 12 is formed narrower than the first wall 11, it is relatively difficult to secure a space for pulling out the electric wire 80. Correspondingly, the recess 7 formed in the second wall 12 is smaller than the recess 7 formed in the first wall 11. As a result, for example, the trunk line having a large bundle of electric wires 80 is connected to the grommet 2 arranged at the lower part of the first wall 11, and the branch line having a small bundle is connected to the grommets 2a and 2b arranged at the upper part of the second wall 12. It is possible to realize a layout in which the drawing space of the electric wire 80 is taken into consideration.

The second upper screwed portion 42 is provided at the upper end portion of the second wall 12. Further, the second upper screwed portion 42 is arranged between the two second connecting convex portions 6 when viewed in the vertical direction (that is, the direction in which the case body 10 and the upper cover 4 are joined). .. As a result, similarly to the first lower screw fastening portion 31 of the first wall 11, the tightening force is evenly applied to the two grommets 2a and 2b without being biased to any of the grommets 2a and 2b when the screw 96 is tightened. It becomes easy to act.

The third wall 13 is provided with a third connecting convex portion (not shown), and the third connecting convex portion is formed with a concave portion similarly to the first wall 11. Further, a third upper screwed portion 43 is provided at the upper end portion of the third wall 13, and a lower screwed portion (not shown) is provided at the lower end portion of the third wall 13.

A fourth upper screwed portion 44 is provided at the upper end portion of the fourth wall 14, and a lower screwed portion (not shown) is provided at the lower end portion of the fourth wall 14.

Next, the lower cover 3 will be described. FIG. 3 is a perspective view showing the configuration of the lower cover 3.

As shown in FIG. 3, the lower cover 3 has a packing groove 37 provided for fitting the lower packing 103, and one or more lower cover screwing portions 38a and 38b provided on each of the four side surfaces. It has 38c, 38d, 38e, 38f, and a lower cover connecting convex portion 39 formed corresponding to the concave portion 7 of the first wall 11 and the concave portion of the third wall 13 in the case body 10.

The packing groove 37 is formed as an elongated groove with the side (upper side) close to the case body 10 open, and is arranged in a loop along the peripheral edge of the lower cover 3.

Although not shown in FIG. 1, the lower packing 103 is formed with a groove in which the side (upper side) close to the case body 10 is opened. The lower packing 103 can be attached to the case body 10 in close contact with the groove by inserting the ribs (not shown) formed in a loop shape on the peripheral edge of the lower end of the case body 10. Then, by fitting the lower packing 103 into the packing groove 37, the lower packing 103 is brought into close contact with the lower cover 3, and thus waterproofing can be realized.

In the recess 7, the lower packing 103 is sandwiched between the grommet 2 and the lower cover 3 instead of between the case body 10 and the lower cover 3. Thereby, a composite waterproof structure by the lower packing 103 and the grommet 2 can be realized between the case main body 10 and the lower cover 3.

The lower cover screwed portions 38a, 38b, 38c, 38d, 38e, 38f are arranged on the respective side surfaces (first wall 11, second wall 12, third wall 13, and fourth wall 14) of the case body 10. It is provided at a position corresponding to the 1 lower screw fastening portion 31, the second lower screw fastening portion 32, and the like.

The lower cover connecting convex portion 39 is provided so as to project outward from the side surface of the lower cover 3 corresponding to the connecting convex portion 5 of the case body 10 or the third connecting convex portion. The lower cover connecting convex portion 39 can close the open portion of the concave portion 7 while contacting the peripheral edge portion of the grommet 2 on the side far from the case body 10.

Next, the upper cover 4 will be described. FIG. 4 is a perspective view showing the configuration of the upper cover 4. In FIG. 4, unlike FIG. 1, the upper cover 4 is shown upside down.

As shown in FIG. 4, the upper cover 4 includes a packing groove 45 provided for fitting the upper packing 104, an upper cover screwing portion 46 provided on each of the four side surfaces, and a second in the case body 10. It has an upper cover connecting convex portion 47 formed corresponding to the concave portion 7 of the wall 12.

The packing groove 45 is formed as an elongated groove with the side (lower side) close to the case body 10 open, and is arranged in a loop along the peripheral edge of the upper cover 4.

Although not shown in FIG. 1, the upper packing 104 is formed with a groove in which the side (lower side) close to the case body 10 is opened. By inserting the rib 17 formed in a loop shape on the peripheral edge of the upper end portion of the case body 10 into this groove, the upper packing 104 can be attached in close contact with the case body 10. Then, by fitting the upper packing 104 into the packing groove 45, the upper packing 104 is brought into close contact with the upper cover 4, and thus waterproofing can be realized.

In the recess 7, the upper packing 104 is sandwiched between the grommets 2a and 2b and the upper cover 4 instead of between the case body 10 and the upper cover 4. As a result, a composite waterproof structure of the upper packing 104 and the grommets 2a and 2b can be realized between the case body 10 and the upper cover 4.

The upper cover screwed portion 46 is a first upper screwed portion 41 and a second upper screw portion arranged on each side surface (first wall 11, second wall 12, third wall 13 and fourth wall 14) of the case body 10. It is provided at a position corresponding to each of the screw fastening portion 42, the third upper screw fastening portion 43, and the fourth upper screw fastening portion 44.

The upper cover connecting convex portion 47 is provided so as to project outward from the side surface of the upper cover 4 corresponding to the second connecting convex portion 6 of the case body 10. The upper cover connecting convex portion 47 can close the open portion of the concave portion 7 while contacting the peripheral portions of the grommets 2a and 2b on the side far from the case main body 10.

A vent hole 48 is formed at an appropriate position on the side surface of the upper cover 4, and a vent filter 93 is attached to the vent hole 48. The vent filter 93 is composed of a known filter that has air permeability and can secure a waterproof function.

Since the electrical junction box 1 has a sealed structure sealed by packings 103, 104, etc., the internal air pressure fluctuates due to a temperature change or the like inside the electrical junction box 1. However, by allowing air to flow through the vent filter 93, distortion of the upper packing 104 and the lower packing 103 due to a change in pressure can be alleviated. Further, the vent filter 93 is arranged on the upper cover 4 fixed to the upper side of the case body 10. Therefore, the heat generated by the heat generated by the electrical components and the like inside the electrical connection box 1 can be easily dissipated through the vent filter 93 on the upper part.

Next, the grommet 2 attached to the first wall 11 will be described with reference to FIGS. 1 and 5 and the like. FIG. 5 is a cross-sectional perspective view showing how the grommet 2 comes into contact with the inner wall of the recess 7.

The grommet 2 is made of an elastic material such as rubber, and is formed by integrally molding an fitting portion 20 to be fitted into the case body 10 and a tubular portion 24 through which the electric wire 80 is passed.

The fitting portion 20 is formed in the shape of a rectangular plate elongated in the vertical direction (however, as described above, the corner portions of the rectangle are appropriately rounded). A hollow tubular portion 24 is provided in a protruding shape in the center of the fitting portion 20. The fitting portion 20 is formed in a hollow shape, and the internal space thereof and the internal space of the tubular portion 24 are connected to each other.

As shown in FIG. 5, the first protruding portion 21, the second protruding portion 22, and the third protruding portion 23 are provided side by side on the outer periphery of the fitting portion 20 in the order closer to the tubular portion 24. .. The first protruding portion 21, the second protruding portion 22, and the third protruding portion 23 are configured as elongated protrusions arranged in parallel with each other, and all of them are provided over the entire circumference of the fitting portion 20.

As shown in FIG. 5, the first protruding portion 21, the second protruding portion 22, and the third protruding portion 23 are formed in the first groove 71, the second groove 72, and the third groove 73 formed on the inner wall of the recess 7. Can be fitted.

At the center of the outer end surface on which the second protruding portion 22 protrudes, a first lip portion 25 is formed so as to project smaller than the outer end surface over the entire outer circumference of the second protruding portion 22. The width of the first lip portion 25 is narrower than that of the outer end surface.

Similarly, at the central portion of the outer end surface on which the third protruding portion 23 protrudes, a second lip portion 26 that is smaller and further protrudes is formed over the entire outer circumference of the third protruding portion 23. The width of the second lip portion 26 is narrower than that of the outer end surface.

A first inner groove portion 27 is formed on the inner peripheral surface 29 of the grommet 2 corresponding to the second protruding portion 22 over the entire circumference. Similarly, a second inner groove portion 28 is formed on the inner peripheral surface 29 of the grommet 2 corresponding to the third protruding portion 23 over the entire circumference.

An inner member 90 made of synthetic resin or the like is attached to the inside of the fitting portion 20 of the grommet 2 in order to prevent the grommet 2 from being deformed. The inner member 90 has an outer peripheral shape that follows the shape of the inner peripheral surface 29 of the grommet 2, and the first rib 91 and the second rib 92 are formed on the outer peripheral surface so as to project over the entire circumference. ing. The first rib 91 and the second rib 92 can be fitted into the first inner groove portion 27 and the second inner groove portion 28 of the grommet 2.

With this configuration, when the grommet 2 is slid from bottom to top as shown in FIG. 6 and fitted into the recess 7, the first lip portion 25 is crushed between the first rib 91 and the second groove 72. , The second lip portion 26 is crushed between the second rib 92 and the third groove 73. Therefore, strong adhesion can be realized between the grommet 2 and the recess 7, and waterproofness can be improved. In this way, it is possible to prevent water from entering between the opening 70 formed from the case body 10 and the lower cover 3 as shown in FIG. 2 and the grommet 2 provided in the opening 70. ..

Further, as shown in FIG. 6, the inside of the tubular portion 24 of the grommet 2 is filled with silicon 97 in a state where the electric wire 80 is passed through, and a water-stop structure is realized. As the silicon 97, a known one-component type silicon can be used. As a result, it is possible to prevent water from entering the inside of the electric connection box 1 from the tubular portion 24 through the electric wire 80.

The grommets 2a and 2b attached to the second wall 12 have substantially the same configuration as the grommets 2 attached to the first wall 11 except that the above-mentioned third protrusion 23 is omitted. It has become. However, for the grommet 2b, the direction in which the electric wire 80 is pulled out is directed downward. As described above, according to the electric connection box 1 of the present embodiment, the electric wires 80 can be pulled out from a plurality of places in various directions.

Further, in the present embodiment, the grommet 2 of the first wall 11 is fixed between the case body 10 and the lower cover 3, and the grommets 2a and 2b of the second wall 12 are fixed between the case body 10 and the upper cover 4. The cover. Therefore, the manufacturer of the electrical junction box delivers a semi-finished product in which the grommet 2 is attached only to the first wall 11 (the lower cover 3 is fixed to the case body 10) to the automobile manufacturer, and the grommet 2a is attached to the second wall 12. , 2b can be easily attached (the work of fixing the upper cover 4 to the case body 10) by the automobile manufacturer.

As described above, the electrical connection box 1 of the present embodiment includes a case main body 10, a lower cover 3, an upper cover 4, and grommets 2, 2a, 2b. A storage space 85 for accommodating electrical components is formed in the case body 10. The lower cover 3 is fixed to the case body 10. The upper cover 4 is fixed to the case body 10 so as to face the lower cover 3 via the case body 10. The electric wire 80 can pass through the grommets 2, 2a and 2b. Of the walls arranged so as to surround the accommodation space 85 in the case body 10, recesses 7 are formed in both the first wall 11 and the second wall 12 arranged adjacent to the first wall 11. Has been done. The recess 7 formed in the first wall 11 is opened on the side close to the lower cover 3. The recess 7 formed in the second wall 12 is opened on the side close to the upper cover 4. Grommets 2, 2a and 2b are arranged in the openings 70 formed from the recesses 7 and the lower cover 3 or the upper cover 4.

As a result, the electric wires 80 can be sorted and pulled out from the electric junction box 1 in various directions, so that it is possible to easily cope with a complicated layout of the electric wires 80. Further, when the grommets 2, 2a and 2b are arranged on the surface where the case body 10 and the covers 3 and 4 are joined, the arrangement location tends to be a weak point in waterproofing, but in the present embodiment, the open side of the recess 7 Since the directions of the first wall 11 and the second wall 12 are opposite to each other, the deterioration of the waterproof performance can be effectively suppressed. Further, since the work of attaching the grommet 2 to the first wall 11 and the work of attaching the grommets 2a and 2b to the second wall 12 can be easily separated, the assembly work can be flexibly shared. be able to.

Further, the electrical connection box 1 of the present embodiment includes a lower packing 103 and an upper packing 104. The lower packing 103 is arranged between the case body 10 and the lower cover 3. The upper packing 104 is arranged between the case body 10 and the upper cover 4. The lower packing 103 is sandwiched between the grommet 2 and the lower cover 3 in the recess 7 formed in the first wall 11. The upper packing 104 is sandwiched between the grommets 2a and 2b and the upper cover 4 in the recess 7 formed in the second wall 12.

As a result, a composite waterproof structure of the packings 103 and 104 and the grommets 2, 2a and 2b is realized, and the case main body 10 and the lower cover 3 or the upper cover 4 can be satisfactorily waterproofed.

Further, in the electrical connection box 1 of the present embodiment, the first wall 11 (where the recess 7 is formed) and the second wall 12 are vertically connected to each other.

As a result, the electric wire 80 can be easily pulled out from the electric junction box 1 in various directions.

Further, in the electrical connection box 1 of the present embodiment, a plurality of recesses 7 are formed in both the first wall 11 and the second wall 12.

As a result, it is possible to realize a layout in which the electric wires 80 are pulled out from a plurality of locations on one wall.

Further, in the electrical connection box 1 of the present embodiment, for example, in the first wall 11, the lower cover 3 that closes the portion where the recess 7 is opened is closed between the plurality of recesses 7, the case body 10, and the case body 10. A first lower screw fastening portion 31 for joining is provided. Similarly, in the second wall 12, a second upper screw fixing portion 42 is provided between the plurality of recesses 7.

As a result, the electric wire 80 can be pulled out from a plurality of places on one wall. Further, since the tightening force applied from the lower cover 3 to the plurality of grommets 2 arranged at the place where the electric wire 80 is pulled out can be less likely to be biased, the waterproof performance as a whole can be improved. ..

Further, the electrical connection box 1 of the present embodiment includes an inner member 90 arranged inside the grommet 2. The first rib 91 and the second rib 92 are formed on the outer periphery of the inner member 90. A second groove 72 and a third groove 73 are formed on the inner circumference of the recess 7. The first rib 91 and the second groove 72 face each other with the grommet 2 in between, and the second rib 92 and the third groove 73 face each other with the grommet 2 in between.

Thereby, the inward deformation of the grommet 2 due to an external force or the like can be prevented by the first rib 91 and the second rib 92 of the inner member 90. Therefore, the waterproof performance can be stably exhibited.

Further, in the electrical connection box 1 of the present embodiment, the first lip portion 25 and the second lip portion 26 are formed on the outer periphery of the grommet 2 at positions corresponding to the first rib 91 and the second rib 92 of the inner member 90. Will be done. The first lip portion 25 and the second lip portion 26 come into contact with the inner walls of the second groove 72 and the third groove 73 formed in the recess 7 while being crushed.

As a result, strong waterproofing can be realized in the first lip portion 25 and the second lip portion 26.

Further, in the electrical connection box 1 of the present embodiment, the concave portion 7 is formed in a connecting convex portion 5 provided so as to project outward from the case main body 10.

As a result, the grommet 2 is less likely to protrude inward of the case body 10, so that a wide accommodation space 85 can be secured.

Further, in the electrical connection box 1 of the present embodiment, the lower cover 3 is fixed to the lower side of the case body 10. The recess 7 provided in the first wall 11 is formed larger than the recess 7 provided in the second wall 12.

Thereby, for example, it is possible to realize a layout in which a thick trunk line wire bundle is pulled out from the lower part of the first wall 11 and a thin branch line wire bundle is pulled out from the second wall 12.

Further, in the electrical connection box 1 of the present embodiment, in the recess 7, a large or small roundness is provided in the portion facing the lower cover 3 or the upper cover 4 that closes the portion where the recess 7 is opened. The grommets 2, 2a and 2b are configured to have a rounded shape corresponding to the roundness.

As a result, it is possible to reduce the angular portion that tends to be a weak point in waterproofing, so that the waterproof performance can be improved.

Further, in the electrical connection box 1 of the present embodiment, the upper cover 4 is fixed to the upper side of the case main body 10, and the upper cover 4 is provided with a vent filter 93 having a ventilation waterproof structure.

This makes it possible to prevent changes in the pressure inside the electrical junction box 1. In addition, the heat generated inside the electrical connection box 1 can be easily released to the outside through the upper ventilation and waterproof structure.

Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

The recess 7 whose side close to the upper cover 4 is open can be changed so as to be provided in the third wall 13 which is arranged to face the first wall 11 instead of the second wall 12. In this case, the third wall 13 can be grasped as the "second wall" of the present invention.

The concave portion 7 can be formed in a non-convex portion instead of being formed in a convex portion such as the connecting convex portion 5.

The case body 10 may be provided with a packing groove into which the lower packing 103 and the upper packing 104 are fitted, and the lower cover 3 and the upper cover 4 may be changed so as to be provided with ribs on which the groove portion of the lower packing 103 or the upper packing 104 is mounted. it can.

The recess 7 may have any shape as long as the side close to the lower cover 3 or the upper cover 4 is open. Further, the recess 7 formed in the second wall 12 can be formed larger than the recess 7 formed in the first wall 11.

One or three or more recesses 7 may be formed in the first wall 11. Similarly, one or three or more recesses 7 may be formed in the second wall 12.

The number of ribs formed on the inner member 90 may be one or three or more instead of two. Similarly, the number of lip portions formed on the grommet 2 may be one or three or more instead of two.

1 Electrical junction box 2, 2a, 2b Grommet 3 Bottom cover (1st cover)
4 Top cover (second cover)
5 Connection convex part 6 Second connection convex part 7 Concave 10 Case body 11 1st wall 12 2nd wall 80 Electric wire 85 Accommodation space

Claims (11)

A case body with a storage space for accommodating electrical components,
The first cover fixed to the case body and
A second cover fixed to the case body so as to face the first cover via the case body,
Grommets through which electric wires can pass,
With
Of the walls arranged so as to surround the accommodation space in the case body, recesses are formed in both the first wall and the second wall arranged facing or adjacent to the first wall. Has been
The recess formed in the first wall is opened on the side close to the first cover.
The recess formed in the second wall is opened on the side close to the second cover.
An electrical connection box characterized in that the grommet is arranged in an opening formed from each of the recesses and the first cover or the second cover. The electrical connection box according to claim 1.
A first packing arranged between the case body and the first cover,
A second packing arranged between the case body and the second cover,
With
The first packing is sandwiched between the grommet and the first cover in the recess formed in the first wall.
The second packing is an electrical connection box characterized in that it is sandwiched between the grommet and the second cover in the recess formed in the second wall. The electrical connection box according to claim 1 or 2.
An electrical junction box characterized in that the first wall and the second wall are vertically connected to each other. The electrical connection box according to any one of claims 1 to 3.
An electrical connection box characterized in that a plurality of recesses are formed in at least one of the first wall and the second wall. The electrical connection box according to claim 4.
The first cover or the second cover that closes a portion in which the recess is opened between the plurality of recesses formed in at least one of the first wall and the second wall, and the case. An electrical connection box characterized by being provided with a screwing portion for joining the main body. The electrical connection box according to any one of claims 1 to 5.
With an inner member arranged inside the grommet,
Ribs are formed on the outer circumference of the inner member.
A groove is formed on the inner circumference of the recess.
An electrical connection box characterized in that the rib and the groove face each other with the grommet in between. The electrical junction box according to claim 6.
A lip portion is formed on the outer periphery of the grommet at a position corresponding to the rib of the inner member.
An electrical connection box characterized in that the lip portion comes into contact with the inner wall of the groove formed in the recess while being crushed. The electrical connection box according to any one of claims 1 to 7.
An electrical connection box characterized in that the concave portion is formed in a connecting convex portion provided so as to project outward from the case main body. The electrical connection box according to any one of claims 1 to 8.
The first cover is fixed to the lower side of the case body and is fixed.
An electrical connection box characterized in that the recess provided in the first wall is formed larger than the recess provided in the second wall. The electrical connection box according to any one of claims 1 to 9.
In the recess, the portion facing the first cover or the second cover that closes the portion where the recess is opened is rounded.
The grommet is an electrical connection box characterized in that the grommet is configured to have a rounded shape corresponding to the roundness. The electrical connection box according to any one of claims 1 to 10.
An electrical connection box characterized in that either the first cover or the second cover is fixed to the upper side of the case body, and the upper cover is provided with a ventilation waterproof structure.

Images