Electrical junction boxes and wire harnesses

Abstract

To provide an electric connection box capable of securing appropriate waterproof performance and a wire harness.SOLUTION: In an electric connection box 1, an outer projection part 211a of a grommet water stop part 211 is formed at a portion opposite an upper cover 13 on an outer surface and extends along a width direction X while projecting to the side of the upper cover 13 along an assembling direction Z from the outer surface. An inner projection part 222 of a grommet inner 22 is formed at a portion opposite an inner surface of the grommet water stop part 211 on the outer surface, and extends around an axial line P while projecting to the inner surface side of the grommet water stop part 211 from the outer surface. A bearing part 211b of the grommet water stop part 211 is formed at a portion opposite an inner surface of an insertion port on the outer surface, and extends around the axial line P. The positions of the outer projection part 211a, the inner projection part 222 and the bearing part 211b with respect to a penetration direction Y coincide with each other.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an electrical junction box and a wire harness. [Background technology]

[0002] For example, Patent Document 1 describes a conventional electrical junction box in which an opening is provided in one cover, an elastic waterproof grommet for inserting electric wires is fitted into the opening, and the one cover is joined to the other cover to form a box body, with the other cover contacting an end of the waterproof grommet. The waterproof grommet mounting structure has an extension rib formed on the other cover that protrudes and presses against the end face of the waterproof grommet, extending deeper than the end face. This allows the extension rib to press against the end face of the waterproof grommet and extend deeper than the end face, thereby improving the waterproofness between the end face of the waterproof grommet and the other cover. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-129545 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the mounting structure of the waterproof grommet described in the above-mentioned Patent Document 1 can improve waterproofness, for example, in the part of the waterproof grommet where the extension rib of the other cover fits in, but it is desirable to improve waterproofness overall, including the part where the extension rib does not fit in.

[0005] SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has an object to provide an electrical junction box and a wire harness that can ensure appropriate waterproof performance. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, an electrical junction box according to the present invention comprises a box-shaped main body portion that accommodates electronic components therein, an opening formed on one side of the main body portion in an assembly direction thereof and communicating the inside and outside of the main body portion along the assembly direction, and an insertion opening formed on an end surface of the opening and communicating the inside and outside of the main body portion along a penetration direction that intersects with the assembly direction; and a grommet that fits into the insertion opening to waterproof the insertion opening and through which a wiring material connected to the electronic components accommodated inside the box body is inserted along the penetration direction. and a cover that is assembled to the box body to close the opening and that, when assembled to the box body, presses the grommet fitted into the insertion hole toward the inner surface of the insertion hole along the assembly direction, wherein the grommet includes a grommet water stopping portion that is formed in an annular shape around an axis along the penetration direction and that fits into the insertion hole to make the insertion hole waterproof, and a grommet inner that is formed in an annular shape around the axis and that is attached to the inner surface of the grommet water stopping portion, and The wiring material is inserted along the penetration direction, and the grommet water stopping portion includes an outer protrusion formed on an outer surface at a portion facing the cover, protruding from the outer surface toward the cover along the assembly direction and extending along a width direction intersecting the assembly direction and the penetration direction, a receiving portion formed on an outer surface at a portion facing the inner surface of the insertion hole and extending around the axis, and an inner groove portion formed on an inner surface at a portion facing the grommet inner and extending in a groove shape around the axis, and the cover is assembled to the box body. in this state, the receiving portion is supported on the inner surface of the insertion hole and the outer protrusion is pressed toward the inner surface of the insertion hole by the cover in the assembly direction, the grommet inner includes an inner protrusion formed on its outer surface at a position facing the inner surface of the grommet water stopping portion, protruding from the outer surface toward the inner surface of the grommet water stopping portion and extending around the axis, and when the grommet inner is attached to the inner surface of the grommet water stopping portion, the inner protrusion fits into the inner groove of the grommet water stopping portion,The outer protruding portion, the inner protruding portion, and the receiving portion are positioned in the same position in the penetration direction.

[0007] A wire harness according to the present invention includes a wiring material having conductivity, and an electric junction box electrically connected to the wiring material, the electric junction box including a box-shaped main body portion accommodating electronic components therein, an opening formed on one side of the main body portion in an assembly direction thereof and communicating between the inside and outside of the main body portion along the assembly direction, and an insertion opening formed on an end surface of the opening and communicating between the inside and outside of the main body portion along a penetration direction intersecting the assembly direction, and a wire harness fitted into the insertion opening to waterproof the insertion opening and electrically connecting the electronic components accommodated inside the box body. a grommet through which the wiring material connected to a component is inserted along the penetration direction; and a cover that is assembled to the box body to close the opening and that, when assembled to the box body, presses the grommet fitted into the insertion opening toward the inner surface of the insertion opening along the assembly direction, wherein the grommet is formed in an annular shape around an axis along the penetration direction and is fitted into the insertion opening to make the insertion opening waterproof; and a grommet insert that is formed in an annular shape around the axis and is attached to the inner surface of the grommet water stopping part. The grommet water stopping portion includes an outer protrusion formed on an outer surface at a portion facing the cover, protruding from the outer surface toward the cover along the assembly direction and extending along a width direction intersecting the assembly direction and the penetration direction, a receiving portion formed on an outer surface at a portion facing the inner surface of the insertion hole and extending around the axis, and a groove-like groove formed on an inner surface at a portion facing the grommet inner and extending around the axis. and an inner groove portion extending from the inner groove portion, and when the cover is assembled to the box body, the receiving portion is supported on the inner surface of the insertion hole and the outer protrusion portion is pressed toward the inner surface of the insertion hole by the cover in the assembly direction, and the grommet inner portion includes an inner protrusion portion formed on the outer surface at a position facing the inner surface of the grommet water stopping portion, protruding from the outer surface toward the inner surface of the grommet water stopping portion and extending around the axis, and when the grommet inner portion is attached to the inner surface of the grommet water stopping portion,The inner protrusion is fitted into the inner groove of the grommet watertight portion, and the outer protrusion, the inner protrusion, and the receiving portion are positioned in the same position in the penetration direction. [Effects of the Invention]

[0008] In the electrical junction box and the wire harness according to the present invention, the outer protrusion, the inner protrusion, and the receiving portion are aligned in the penetration direction, so that when the opening of the box body is closed with the cover, the pressure from the cover on the grommet waterproofing portion is prevented from being dispersed. This allows the electrical junction box and the wire harness to press the grommet waterproofing portion evenly against the inner surface of the insertion opening, ensuring appropriate waterproofing performance. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a cutaway perspective view showing an example of the configuration of an electrical junction box and a wire harness according to an embodiment. [Figure 2] FIG. 2 is a cutaway exploded perspective view showing an example of the configuration of the electrical junction box and the wire harness according to the embodiment. [Figure 3] FIG. 3 is an exploded perspective view showing an example of the configuration of the grommet according to the embodiment. [Figure 4] FIG. 4 is a cutaway cross-sectional assembly view showing an example of the configuration of the electrical junction box and the wire harness according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Modes (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. Furthermore, the components described below include those that can be easily imagined by a person skilled in the art and those that are substantially the same. Furthermore, the configurations described below can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the configuration can be made within the scope of the gist of the present invention.

[0011] [Embodiment] An electric junction box 1 and a wire harness WH according to an embodiment will be described with reference to the drawings.

[0012] In the following description, among the first, second, and third directions intersecting each other in each drawing, the first direction is referred to as the "width direction X," the second direction is referred to as the "penetration direction Y," and the third direction is referred to as the "assembly direction Z." The width direction X, the penetration direction Y, and the assembly direction Z intersect with each other and are typically perpendicular to each other. The width direction X is a direction along the width of the box body 11 described below. The penetration direction Y is a direction penetrating the box body 11 and is also a direction along the axis P of the grommet body 21 described below. The assembly direction Z is a direction in which the upper cover 13 and the lower cover 12 described below are respectively assembled to the box body 11. Unless otherwise specified, each direction used in the following description will be described as a direction in a state in which the respective parts are assembled to each other and the electrical junction box 1 is mounted on a vehicle. Note that in Figures 1 and 4 described below, the wiring material W is omitted using a dashed line, and in other figures, the wiring material W is not shown at all. In addition, in each drawing, the components are shown in a simplified and omitted form as appropriate.

[0013] The electrical junction box 1 according to this embodiment shown in FIGS. 1 and 2 is mounted on a vehicle such as an automobile and incorporated into a wire harness WH. The wire harness WH is, for example, a collection of wiring materials W used for power supply and signal communication to connect various devices mounted on the vehicle, and the wiring materials W are connected to the devices using connectors or the like. The wire harness WH includes a conductive wiring material W and an electrical junction box 1 electrically connected to the wiring material W. The wiring material W is formed, for example, from a metal rod, an electric wire, a bundle of electric wires, etc. The metal rod is a conductive rod-shaped member whose exterior is covered with an insulating covering. The electric wire is a conductor (core wire) made of multiple conductive metal strands whose exterior is covered with an insulating covering. The bundle of electric wires is a bundle of such electric wires. The wire harness WH bundles and aggregates a plurality of wiring materials W, and is electrically connected to the electrical junction box 1 via connectors or the like provided at the ends of the bundled wiring materials W. The wire harness WH may further include a protector, an exterior material, a fixing device, and the like.

[0014] The electrical junction box 1 is a connector box that aggregates and connects a plurality of connectors provided at the ends of a wiring material W of a wire harness WH to connectors of various devices in a vehicle. As shown in FIGS. 1 and 2, the electrical junction box 1 includes a housing box 10 and a grommet 20.

[0015] The storage box 10 stores electronic components D in a storage space 111d formed therein. The storage box 10 includes a box main body 11, a lower cover 12, and an upper cover 13 as a cover. The storage box 10 is open on one side Z1 in the assembly direction Z of the box main body 11 and on the other side Z2 in the assembly direction Z of the box main body 11. The lower cover 12 closes the opening 112 (lower opening 112b) on the other side Z2 in the assembly direction Z of the box main body 11, and the upper cover 13 closes the opening 112 (upper opening 112a) on one side Z1 in the assembly direction Z of the box main body 11. The storage box 10 will be described in detail below.

[0016] The box body 11 is surrounded by four side walls and is formed in a generally rectangular cylindrical shape when viewed from the assembly direction Z. The box body 11 includes a main body 111, an opening 112, and an insertion hole 113.

[0017] The main body 111 is formed in a box shape and accommodates electronic components D (see FIG. 4) therein. As shown in FIG. 2, the main body 111 includes a pair of side walls 111b and 111c facing each other along the width direction X and a pair of side walls 111a facing each other along the penetration direction Y. In this example, the side wall of the main body 111 on the other side Y2 of the penetration direction Y is not shown. The main body 111 is surrounded by the four side walls 111a to 111c to form an accommodation space 111d therein, and the electronic components D are accommodated in this accommodation space 111d. The accommodation space 111d is provided with, for example, holding portions (not shown) for holding the plurality of electronic components D, respectively. The main body 111 accommodates the plurality of electronic components D in the accommodation space 111d with the plurality of electronic components D held by the holding portions.

[0018] Opening 112 is an open portion in main body 111, and includes upper opening 112a and lower opening 112b.

[0019] The upper opening 112a is formed on one side Z1 of the main body 111 in the assembly direction Z, and connects the inside and outside of the main body 111 along the assembly direction Z. The upper opening 112a is formed in a substantially rectangular shape when viewed from the assembly direction Z. For example, when accommodating an electronic component D in the accommodation space 111d, the electronic component D is inserted into the accommodation space 111d through the upper opening 112a.

[0020] The lower opening 112b is formed on the other side Z2 of the main body 111 in the assembly direction Z, and connects the inside and outside of the main body 111 along the assembly direction Z. The lower opening 112b is formed in a substantially rectangular shape when viewed from the assembly direction Z, and is formed in a shape similar to that of the above-mentioned upper opening 112a. For example, the lower opening 112b allows a wiring material W connected to multiple electronic components D to extend to the outside through the lower opening 112b.

[0021] The insertion hole 113 is a portion into which the grommet 20 is fitted, and as shown in FIG. 2, is formed in an end surface 112c of the upper opening 112a, and communicates the inside and outside of the main body 111 along the penetration direction Y. The insertion hole 113 is formed, for example, in the side wall 111a provided on one side Y1 in the penetration direction Y, among the four side wall portions 111a to 111c that constitute the main body 111. The insertion hole 113 is formed, for example, as a through hole that penetrates the side wall 111a along the penetration direction Y, and is located on an end surface 112c of the side wall 111a on one side Z1 in the assembly direction Z. In other words, the insertion hole 113 is formed by recessing the side wall 111a from the end surface 112c of the side wall 111a toward the other side Z2 in the assembly direction Z. That is, the insertion opening 113 is formed by hollowing out a portion of the side wall portion 111a including the end surface 112c. The insertion opening 113 is open on one side Z1 in the assembly direction Z. When viewed from the penetration direction Y, the insertion opening 113 is formed in a substantially elliptical shape whose length in the width direction X is longer than its length in the assembly direction Z.

[0022] The insertion hole 113 is configured to include an insertion hole protrusion 113a (see FIGS. 2 and 4). The insertion hole protrusion 113a is formed on the inner surface 113b of the insertion hole 113 at a location facing an outer surface 211e of the grommet water-stopping portion 211 (described later), protrudes from the inner surface 113b toward the outer surface 211e of the grommet water-stopping portion 211, and extends around the axis P. That is, the insertion hole protrusion 113a is formed linearly, extends around the axis P along the inner surface 113b of the insertion hole 113, and protrudes from the inner surface 113b. The insertion hole protrusion 113a extends from one end to the other end in the width direction X of the inner surface 113b of the insertion hole 113; in other words, it is formed around the axis P around the entire periphery of the inner surface 113b of the insertion hole 113. The insertion opening protrusion 113a fits into an outer groove 211m of the grommet 20, which will be described later.

[0023] Next, the lower cover 12 will be described. The lower cover 12 closes the lower opening 112b of the main body 111. The lower cover 12 is formed, for example, in a tray shape and is assembled to the lower opening 112b of the main body 111 to close the lower opening 112b. The lower cover 12 closes the lower opening 112b while leaving a part of the lower opening 112b exposed so that, for example, a wiring material W connected to an electronic component D housed in the main body 111 can be routed to the outside through the lower opening 112b. In other words, the lower cover 12 closes a part of the lower opening 112b, but does not close the entire lower opening 112b.

[0024] Next, we will explain the upper cover 13. The upper cover 13 closes the upper opening 112a of the main body 111. The upper cover 13 is formed, for example, in a shape that can cover the entire upper opening 112a, and is assembled to the upper opening 112a of the main body 111 to close the entire upper opening 112a.

[0025] The upper cover 13 is configured to include a recess 131 (see FIG. 4). The recess 131 is formed in an annular shape along the outer shape of the upper cover 13, and is formed in a portion facing the edge of the main body portion 111 of the box body 11 and an outer protrusion 211a of the grommet 20 (described below) fitted into the insertion opening 113 of the main body portion 111, and is recessed along the assembly direction Z. An elastically deformable packing 14 is provided inside the recess 131, and when the upper cover 13 is assembled to the box body 11, the upper cover 13 presses, via the packing 14, against the edge of the main body portion 111 of the box body 11 and the outer protrusion 211a of the grommet 20 fitted into the insertion opening 113 of the main body portion 111. The recess 131 accommodates the edge of the main body 111 of the box body 11 and the outer protrusion 211a of the grommet 20 inside while pressing against the edge of the main body 111 of the box body 11 and the outer protrusion 211a of the grommet 20 fitted into the insertion opening 113 of the main body 111. A packing 15 is further provided between the upper cover 13 and the grommet 20.

[0026] Next, a description will be given of the grommet 20. The grommet 20 includes a grommet body 21 and a grommet inner 22.

[0027] The grommet body 21 is a component that fits into the insertion opening 113 of the storage box 10 to waterproof the insertion opening 113, and through which a wiring material W connected to an electronic component D stored inside the storage box 10 is inserted along the penetration direction Y. The grommet body 21 is formed, for example, from an insulating elastic resin material that has low rigidity and high flexibility, such as rubber or a thermoplastic elastomer (for example, ethylene-propylene-diene rubber (EPDM)). The grommet body 21 is configured to include a grommet waterproofing portion 211 and a tubular portion 212, which are integrally formed as an elastic body.

[0028] The grommet water-stopping portion 211 is formed in an annular shape around the axis P, is fitted into the insertion opening 113 to seal the insertion opening 113, and is formed in a shape similar to the outer shape of the insertion opening 113. When viewed from the penetration direction Y, the grommet water-stopping portion 211 is formed, for example, in a substantially elliptical shape whose length in the width direction X is longer than its length in the assembly direction Z. Specifically, as shown in FIG. 3 , the grommet water-stopping portion 211 includes an upper surface portion 211g formed along the width direction X, a lower surface portion 211h facing the upper surface portion 211g along the assembly direction Z and formed along the width direction X, a first curved portion 211i connecting one side of the upper surface portion 211g to one side of the lower surface portion 211h, and a second curved portion 211j connecting the other side of the upper surface portion 211g to the other side of the lower surface portion 211h. The grommet waterproof portion 211 includes an outer protruding portion 211a, a receiving portion 211b, and an inner groove portion 211c.

[0029] The outer protrusion 211a is formed on the outer surface 211e of the grommet water-stopping part 211 at a location facing the upper cover 13, and protrudes from an upper surface portion 211g of the outer surface 211e toward the upper cover 13 along the assembly direction Z and extends along the width direction X. That is, the outer protrusion 211a is formed linearly on the upper surface portion 211g from one side to the other in the width direction X, and protrudes to one Z1 side in the assembly direction Z (the upper cover 13 side).

[0030] The receiving portion 211b is formed on the outer surface 211e of the grommet water-stopping portion 211 at a position facing the inner surface 113b of the insertion opening 113, and extends around the axis P. The receiving portion 211b extends, for example, along the inner surface 113b of the insertion opening 113 around the axis P, and is formed across the first curved portion 211i, the lower surface portion 211h, and the second curved portion 211j of the grommet water-stopping portion 211. The receiving portion 211b is configured to include an outer groove portion 211m. The outer groove portion 211m is formed on the outer surface 211e of the grommet water-stopping portion 211 at a position facing the insertion opening protrusion 113a of the insertion opening 113, and extends in a groove-like manner around the axis P. The outer groove portion 211m extends, for example, along the inner surface 113b of the insertion opening 113 around the axis P, and is formed in a groove shape across the first curved portion 211i, the lower surface portion 211h, and the second curved portion 211j of the grommet water-stopping portion 211. When the grommet water-stopping portion 211 is fitted into the insertion opening 113, the insertion opening protrusion 113a fits into the outer groove portion 211m.

[0031] The inner groove 211c is formed on the inner surface 211d of the grommet water-stopping portion 211 in a portion facing the inner grommet 22, and extends in a groove-like shape around the axis P. The inner groove 211c extends, for example, along the outer surface 223 of the inner grommet 22 around the axis P, and is formed in a groove-like shape on the inner surfaces 211d across the upper surface 211g, the first curved portion 211i, the lower surface 211h, and the second curved portion 211j of the grommet water-stopping portion 211. That is, the inner groove 211c is formed in an annular shape around the axis P on the inner surface 211d of the grommet water-stopping portion 211. An inner protrusion 222 of the inner grommet 22, which will be described later, fits into the inner groove 211c when the inner grommet 22 is attached to the inner surface 211d of the grommet water-stopping portion 211.

[0032] The grommet water-tight portion 211 configured as described above is fitted into the insertion opening 113, and when the upper cover 13 is assembled to the box body 11, the receiving portion 211b (outer groove portion 211m) is supported by the inner surface 113b of the insertion opening 113, and the outer protrusion 211a is pressed toward the inner surface 113b of the insertion opening 113 along the assembly direction Z by the upper cover 13, thereby waterproofing the insertion opening 113.

[0033] Next, the tubular portion 212 of the grommet body 21 will be described. The tubular portion 212 is a portion that extends from the grommet water-stopping portion 211 to the opposite side of the storage box 10 along the penetration direction Y. As shown in Fig. 3, the tubular portion 212 is formed integrally with the grommet water-stopping portion 211 and is formed in a tubular shape that is a substantially elongated cylinder. The wiring material W is inserted into the tubular portion 212.

[0034] Next, the grommet inner 22 will be described. The grommet inner 22 is made of a hard synthetic resin material having insulating properties and is harder than the grommet water-stopping portion 211. The grommet inner 22 is attached to the inner surface 211d of the grommet water-stopping portion 211 with the wiring material W inserted therethrough. The grommet inner 22 is formed in a ring shape around the axis P, is formed in a substantially cylindrical shape penetrating along the penetration direction Y, and, when viewed from the penetration direction Y, is formed in a substantially elliptical shape whose length in the width direction X is longer than its length in the assembly direction Z. The grommet inner 22 includes a first insertion portion 221a and a second insertion portion 221b on an inner surface 224 of the grommet inner 22. The first insertion portion 221a and the second insertion portion 221b are arranged side by side along the width direction X, and the wiring material W is inserted through each of them. In other words, the inner grommet 22 has an inner space divided into a first insertion portion 221a and a second insertion portion 221b, and is configured to hold the wiring material W when inserted into each divided area. The first insertion portion 221a is cylindrical when viewed from the penetration direction Y, and includes a first semi-cylindrical portion and a second semi-cylindrical portion, and the first and second semi-cylindrical portions are separable. The first insertion portion 221a has an inner surface 224 on which the wiring material W is placed when the first and second semi-cylindrical portions are separated, and the wiring material W is inserted inside by combining the separated first and second semi-cylindrical portions. The second insertion portion 221b has a similar configuration to the first insertion portion 221a. That is, when viewed from the penetration direction Y, the second insertion portion 221b is formed in a cylindrical shape and includes a first semi-cylindrical portion and a second semi-cylindrical portion, the first semi-cylindrical portion and the second semi-cylindrical portion being separable. The second insertion portion 221b has the wiring material W arranged on its inner surface 224 when the first semi-cylindrical portion and the second semi-cylindrical portion are separated, and the wiring material W is inserted into the inside by combining the separated first semi-cylindrical portion and the second semi-cylindrical portion. The grommet inner 22 configured in this manner is attached to the inside of the grommet water-stopping portion 211 with the wiring material W inserted and held therein, and supports the grommet water-stopping portion 211 from the inside.

[0035] The inner grommet 22 includes an inner protrusion 222. The inner protrusion 222 is formed on the outer surface 223 of the inner grommet 22 at a position facing the inner surface 211d of the grommet water-stopping portion 211, protruding from the outer surface 223 of the inner grommet 22 toward the inner surface 211d of the grommet water-stopping portion 211 and extending around the axis P. That is, the inner protrusion 222 is formed linearly, extends around the axis P along the outer surface 223 of the inner grommet 22, and protrudes outward from the outer surface 223 of the inner grommet 22. The inner protrusion 222 may be formed, for example, in a continuous annular shape around the axis P, or in a discontinuous, substantially annular shape around the axis P. That is, the inner protrusion 222 may be configured such that multiple protrusions are provided at intervals around the axis P. The inner protrusion 222 is provided at the center of the inner grommet 22 in the penetration direction Y. In other words, the inner protrusion 222 is provided at one location in the penetration direction Y, and is provided at the center of the inner grommet 22 in the penetration direction Y when viewed from the assembly direction Z. The inner protrusion 222 fits into the inner groove 211c of the grommet water-stopping portion 211 when the inner grommet 22 is attached to the inner surface 211d of the grommet water-stopping portion 211. The inner grommet 22 is plane-symmetrical with respect to an imaginary plane Q that is perpendicular to the penetration direction Y and located at the center of the inner grommet 22 in the penetration direction Y. In other words, when the inner grommet 22 is divided into two parts by the imaginary plane Q, these two parts are symmetrical with respect to the imaginary plane Q.

[0036] The outer protrusion 211a of the grommet water-stopping portion 211, the inner protrusion 222 of the grommet inner 22, and the receiving portion 211b (outer groove 211m) of the grommet water-stopping portion 211 are positioned in the same position in the penetration direction Y. That is, the outer protrusion 211a, the inner protrusion 222, and the receiving portion 211b (outer groove 211m) are positioned on the same plane perpendicular to the penetration direction Y. In other words, the outer protrusion 211a, the inner protrusion 222, and the receiving portion 211b (outer groove 211m) overlap each other when viewed from the assembly direction Z. In the grommet 20 configured as described above, with the grommet water-stopping portion 211 fitted into the insertion opening 113, a wiring material W is inserted into the inside of the grommet water-stopping portion 211 and the grommet inner 22 along the penetration direction Y.

[0037] Next, a method for assembling the grommet 20 to the housing box 10 to form the wire harness WH will be described. The worker inserts the wiring material W connected to the electronic components D housed in the box main body 11 into the inner surface 224 of the grommet inner 22, and attaches the grommet inner 22 with the wiring material W inserted therethrough to the inner surface 211d of the grommet water-stopping portion 211. At this time, the worker attaches the grommet inner 22 to the inner surface 211d of the grommet water-stopping portion 211 with the inner protrusion 222 of the grommet inner 22 fitted into the inner groove 211c of the grommet water-stopping portion 211. Then, the worker fits the grommet water-stopping portion 211 of the grommet 20, with the grommet inner 22 attached to the grommet water-stopping portion 211, into the insertion opening 113 of the box main body 11. At this time, the worker fits the outer groove 211m of the grommet water-stopping portion 211 into the insertion port protrusion 113a of the insertion port 113. Then, the worker closes the opening 112 (upper opening 112a) on one side Z1 in the assembly direction Z of the box body 11 with the upper cover 13, and engages the upper cover 13 with the box body 11 to form the wire harness WH. At this time, in the wire harness WH, the upper cover 13 presses the edge of the main body 111 of the box body 11 and the outer protrusion 211a of the grommet 20 fitted into the insertion port 113 of the main body 111 toward the other side Z2 in the assembly direction Z via the packing 14, and presses the outer surface 211e of the grommet water-stopping portion 211 against the inner surface 113b of the insertion port 113.

[0038] As described above, the electrical junction box 1 according to the embodiment includes the box body 11, the grommet 20, and the upper cover 13. The box body 11 includes a main body portion 111, an upper opening 112a, and an insertion hole 113. The main body portion 111 is formed in a box shape and accommodates an electronic component D therein. The upper opening 112a is formed on one side Z1 of the main body portion 111 in the assembly direction Z, and provides communication between the inside and outside of the main body portion 111 along the assembly direction Z. The insertion hole 113 is formed on an end surface 112c of the upper opening 112a, and provides communication between the inside and outside of the main body portion 111 along a penetration direction Y intersecting the assembly direction Z. The grommet 20 fits into the insertion hole 113 to waterproof the insertion hole 113, and a wiring material W connected to the electronic component D accommodated inside the box body 11 is inserted through the insertion hole 113 along the penetration direction Y. The upper cover 13 is assembled to the box body 11 to close the upper opening 112a, and when assembled to the box body 11, presses the grommet 20 fitted into the insertion opening 113 toward the inner surface 113b of the insertion opening 113 along the assembly direction Z. Here, the grommet 20 is configured to include a grommet water-stopping portion 211 and an inner grommet 22. The grommet water-stopping portion 211 is formed in an annular shape around an axis P along the penetration direction Y, and fits into the insertion opening 113 to waterproof the insertion opening 113. The inner grommet 22 is formed in an annular shape around the axis P, and is attached to the inner surface 113b of the grommet water-stopping portion 211. A wiring material W is inserted into the inside of the grommet water-stopping portion 211 and the inner grommet 22 along the penetration direction Y. The grommet waterproofing portion 211 includes an outer protrusion 211a, a receiving portion 211b, and an inner groove 211c. The outer protrusion 211a is formed on the outer surface 211e at a position facing the upper cover 13, protrudes from the outer surface 211e toward the upper cover 13 along the assembly direction Z, and extends along a width direction X intersecting the assembly direction Z and the penetration direction Y. The receiving portion 211b is formed on the outer surface 211e at a position facing the inner surface 113b of the insertion opening 113, and extends around the axis P. The inner groove 211c is formed on the inner surface 211d at a position facing the inner grommet 22, and extends in a groove-like shape around the axis P.When the upper cover 13 is assembled to the box body 11, the receiving portion 211b of the grommet water-stopping portion 211 is supported by the inner surface 113b of the insertion opening 113, and the outer protrusion 211a is pressed toward the inner surface 113b of the insertion opening 113 by the upper cover 13 along the assembly direction Z. The inner grommet 22 includes an inner protrusion 222. The inner protrusion 222 is formed on the outer surface 223 at a position facing the inner surface 211d of the grommet water-stopping portion 211, and protrudes from the outer surface 223 toward the inner surface 211d of the grommet water-stopping portion 211 and extends around the axis P. When the inner grommet 22 is attached to the inner surface 211d of the grommet water-stopping portion 211, the inner protrusion 222 fits into the inner groove 211c of the grommet water-stopping portion 211. The outer protruding portion 211a, the inner protruding portion 222, and the receiving portion 211b are positioned in the same position in the penetration direction Y.

[0039] With this configuration, in the electrical junction box 1, the outer protrusion 211a, the inner protrusion 222, and the receiving portion 211b are aligned in position in the penetration direction Y, so when the upper opening 112a of the box body 11 is closed by the upper cover 13, the pressure R from the upper cover 13 to the grommet water-stopping portion 211 can be prevented from dispersing, as shown in Fig. 4. This allows the electrical junction box 1 to press the grommet water-stopping portion 211 evenly against the inner surface 113b of the insertion opening 113, ensuring appropriate waterproof performance.

[0040] In the electrical junction box 1, the insertion port 113 is formed on the inner surface 113b at a position facing the outer surface 211d of the grommet water-stopping portion 211, and includes an insertion port protrusion 113a that protrudes from the inner surface 113b toward the outer surface 211d of the grommet water-stopping portion 211 and extends around the axis P. The receiving portion 211b is formed on the outer surface 211e at a position facing the insertion port protrusion 113a, and includes an outer groove 211m that extends in a groove-like manner around the axis P, and when the grommet water-stopping portion 211 is fitted into the insertion port 113, the insertion port protrusion 113a fits into the outer groove 211m. With this configuration, the electrical junction box 1 allows the grommet water-stopping portion 211 to be fitted into the insertion port 113 properly.

[0041] In the electrical junction box 1, the inner grommet 22 is plane-symmetrical with respect to an imaginary plane Q that is perpendicular to the penetration direction Y and is located at the center of the inner grommet 22 in the penetration direction Y. With this configuration, when the inner grommet 22 is attached to the inner surface 211d of the grommet waterproofing portion 211, the inner grommet 22 can be attached from both sides in the penetration direction Y, i.e., from one Y1 side and the other Y2 side in the penetration direction Y, so there is no need to check the orientation of the inner grommet 22, improving workability.

[0042] In the electrical junction box 1, the inner grommet 22 has an inner protrusion 222 provided at the center in the penetration direction Y of the inner grommet 22. With this configuration, the electrical junction box 1 can more easily fit the inner protrusion 222 into the inner groove 211c of the grommet waterproofing part 211, compared to conventional cases in which the inner protrusion is provided at the back side (the cylindrical part side) in the penetration direction Y of the inner grommet.

[0043] In the electrical junction box 1, the upper cover 13 is formed in a position facing the outer protrusion 211a and includes a recess 131 recessed along the assembly direction Z. An elastically deformable packing 14 is provided inside this recess 131, and when the upper cover 13 is assembled to the box body 11, the recess 131 accommodates the outer protrusion 211a in a state in which the upper cover 13 presses the outer protrusion 211a via the packing 14. With this configuration, the electrical junction box 1 can have the upper cover 13 press the outer protrusion 211a appropriately.

[0044] The wire harness WH includes a conductive wiring material W and an electric junction box 1 electrically connected to the wiring material W, and has the same effect as the electric junction box 1 described above.

[0045] [Modification] In the above description, an example has been described in which the electrical junction box 1 has the groove-shaped outer groove 211m formed in the grommet water-stopping portion 211 and the protruding insertion port protrusion 113a formed in the insertion port 113, and these are fitted together, but this is not limiting, and for example, the groove and protrusion may be formed in the opposite direction. That is, the electrical junction box 1 may have the protruding outer protrusion formed in the grommet water-stopping portion 211, and the groove-shaped insertion port groove formed in the insertion port 113, and these may be fitted together.

[0046] Although the example in which the inner grommet 22 is plane-symmetrical with respect to the imaginary plane Q has been described, the present invention is not limited to this and the inner grommet 22 may have a configuration that is not plane-symmetrical with respect to the imaginary plane Q.

[0047] The grommet inner 22 has been described as an example in which the inner protrusion 222 is located in the center of the penetration direction Y of the grommet inner 22, but this is not limited to this and may be located, for example, on one Y1 side or the other Y2 side of the penetration direction Y of the grommet inner 22.

[0048] Although an example has been described in which the upper cover 13 presses the outer protrusion 211a via the gasket 14, this is not limited to this, and for example, the upper cover 13 may press the outer protrusion 211a directly without via the gasket 14.

[0049] Although the electrical connection box 1 has been described as a connector box, the present invention is not limited to this and may be, for example, a junction box, a fuse box, a relay box, or the like. [Explanation of symbols]

[0050] 1 Electrical junction box 111 Main body 112 Opening 112c end face 113 Insertion port 113a Insertion port protrusion 113b Inside 11 Box body 13 Upper cover (cover) 131 recess 14 Gasket 20 Grommets 211 Grommet water stop part 211a Outer protrusion 211b Receiving part 211c Inner groove 211d Inside 211e Exterior 211m outer groove 22 Grommet inner 222 Inner protrusion D Electronic components P axis Q Virtual plane W Routing material WH Wire Harness X Width direction Y penetration direction Z Assembly direction Z1 One side of assembly direction

Claims

1. a box body including a main body formed in a box shape and accommodating electronic components therein; an opening formed on one side of the main body in an assembly direction, the opening communicating the inside and outside of the main body along the assembly direction; and an insertion port formed on an end surface of the opening, the insertion port communicating the inside and outside of the main body along a penetration direction intersecting the assembly direction; a grommet that fits into the insertion opening to waterproof the insertion opening and through which a wiring material connected to the electronic components housed inside the box body is inserted along the penetration direction; a cover that is assembled to the box body to close the opening, and that, when assembled to the box body, presses the grommet fitted in the insertion opening toward an inner surface of the insertion opening along the assembly direction, The grommet includes a grommet water-stopping portion formed in an annular shape around an axis along the penetration direction, and fitted into the insertion opening to make the insertion opening waterproof, and a grommet inner formed in an annular shape around the axis and attached to the inner surface of the grommet water-stopping portion, and the wiring material is inserted inside the grommet water-stopping portion and the grommet inner along the penetration direction, The grommet water-stopping portion includes an outer protrusion formed on the outer surface at a portion facing the cover, protruding from the outer surface toward the cover along the assembly direction and extending along a width direction intersecting the assembly direction and the penetration direction, a receiving portion formed on the outer surface at a portion facing the inner surface of the insertion hole and extending around the axis, and an inner groove portion formed on the inner surface at a portion facing the grommet inner and extending in a groove-like shape around the axis, and when the cover is assembled to the box body, the receiving portion is supported by the inner surface of the insertion hole and the outer protrusion is pressed by the cover toward the inner surface of the insertion hole along the assembly direction, the grommet inner includes an inner protrusion formed on an outer surface at a portion facing the inner surface of the grommet water stopping portion, protruding from the outer surface toward the inner surface of the grommet water stopping portion and extending around the axis, and when the grommet inner is attached to the inner surface of the grommet water stopping portion, the inner protrusion fits into the inner groove of the grommet water stopping portion, The electrical junction box is characterized in that the outer protruding portion, the inner protruding portion, and the receiving portion are positioned in the same position in the penetration direction.

2. the insertion opening is formed on an inner surface at a position facing an outer surface of the grommet water stopping portion, and includes an insertion opening protrusion that protrudes from the inner surface toward the outer surface of the grommet water stopping portion and extends around the axis, 2. The electrical connection box according to claim 1, wherein the receiving portion is formed on the outer surface at a position opposite the insertion port protrusion and includes an outer groove portion extending in a groove-like manner around the axis, and the insertion port protrusion is fitted into the outer groove portion when the grommet water-stopping portion is fitted into the insertion port.

3. 3. The electrical junction box according to claim 1, wherein the inner grommet is plane-symmetrical with respect to an imaginary plane that is perpendicular to the penetration direction and positioned at the center of the inner grommet in the penetration direction.

4. 4. The electrical junction box according to claim 1, wherein the inner protrusion of the inner grommet is provided at a center of the inner grommet in the direction of penetration.

5. the cover includes a recess formed in a portion facing the outer protruding portion and recessed along the assembly direction, An electrical connection box as described in any one of claims 1 to 4, wherein the recess has an elastically deformable gasket provided inside, and when the cover is assembled to the box body, the cover accommodates the outer protrusion while pressing the outer protrusion through the gasket.

6. A conductive wiring material; An electrical connection box electrically connected to the wiring material is provided, The electrical connection box comprises: a box body including a main body formed in a box shape and accommodating electronic components therein; an opening formed on one side of the main body in an assembly direction, the opening communicating the inside and outside of the main body along the assembly direction; and an insertion port formed on an end surface of the opening, the insertion port communicating the inside and outside of the main body along a penetration direction intersecting the assembly direction; a grommet that fits into the insertion opening to waterproof the insertion opening, and through which the wiring material connected to the electronic components housed inside the box body is inserted along the penetration direction; a cover that is assembled to the box body to close the opening, and that, when assembled to the box body, presses the grommet fitted in the insertion opening toward an inner surface of the insertion opening along the assembly direction, The grommet includes a grommet water-stopping portion formed in an annular shape around an axis along the penetration direction, and fitted into the insertion opening to make the insertion opening waterproof, and a grommet inner formed in an annular shape around the axis and attached to the inner surface of the grommet water-stopping portion, and the wiring material is inserted inside the grommet water-stopping portion and the grommet inner along the penetration direction, The grommet water-stopping portion includes an outer protrusion formed on the outer surface at a portion facing the cover, protruding from the outer surface toward the cover along the assembly direction and extending along a width direction intersecting the assembly direction and the penetration direction, a receiving portion formed on the outer surface at a portion facing the inner surface of the insertion hole and extending around the axis, and an inner groove portion formed on the inner surface at a portion facing the grommet inner and extending in a groove-like shape around the axis, and when the cover is assembled to the box body, the receiving portion is supported by the inner surface of the insertion hole and the outer protrusion is pressed by the cover toward the inner surface of the insertion hole along the assembly direction, the grommet inner includes an inner protrusion formed on an outer surface at a portion facing the inner surface of the grommet water stopping portion, protruding from the outer surface toward the inner surface of the grommet water stopping portion and extending around the axis, and when the grommet inner is attached to the inner surface of the grommet water stopping portion, the inner protrusion fits into the inner groove of the grommet water stopping portion, The wire harness is characterized in that the outer protruding portion, the inner protruding portion, and the receiving portion are positioned in the same position in the penetration direction.

Images