Electrical junction box

Abstract

To provide an electric connection box capable of improving workability in maintenance.SOLUTION: An electric connection box 1 comprises: an electric component 11; a fuse component 2 mounted on the electric component to distribute power to a load; and a case 10 that stores the electric component 11 and the fuse component 2. The fuse component 2 is provided with a conductive busbar 3, and an insulative housing 4 that covers the busbar 3. The busbar 3 includes a plate-like busbar body 30, and a load connection part 33 connected to the busbar body 30 via a fusible element 32 fused when excess current flows. The load connection part 33 is located on an upper portion Z1 than the fusible element 32 away from the busbar body 30. The fuse component 2 is configured to be pulled out from the electric component 11 toward the upper portion Z1, and also to expose the load connection part 33 from the case 10 to the upper portion Z1 when it is pulled out from the electric component 11 toward the upper portion Z1.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an electrical connection box.

Background Art

[0002] For example, a vehicle as a moving body is equipped with a battery as a power supply source that supplies power to various electronic devices and the like mounted on the vehicle. The battery and the electric wires connected to the electronic devices and the like are electrically connected via, for example, a fuse unit, and the power from the battery is supplied to the electronic devices and the like. The fuse unit distributes the power from the battery to each of the electronic devices and the like and prevents excessive power from being supplied to the electronic devices and the like (see, for example, Patent Document 1).

[0003] The fuse unit disclosed in Patent Document 1 includes a fuse bus bar and a housing in which the fuse bus bar is embedded.

[0004] The fuse bus bar includes a first bus bar and a second bus bar connected via a fusible body that can be blown at a predetermined energization current. The first bus bar conducts the current from the battery side. The second bus bar conducts the current from the alternator side. The first bus bar and the second bus bar each include an input connection portion, a conduction portion continuous with the input connection portion, and an output connection portion continuous with the conduction portion via a fusible body that can be blown at a predetermined energization current. The output connection portion is disposed below the fusible body.

[0005] The housing is configured such that in a state where the fuse bus bar is embedded, the input connection portions of the first bus bar and the second bus bar protrude outward from the housing. Further, a housing-side locking portion is provided on the back surface of the housing, and the fuse link unit is assembled to the inner wall of the relay box by being locked to a relay box-side locking portion provided on the inner wall of the relay box.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2011-9159 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, with conventional fusible link units, when removing them from the relay box for maintenance, it was necessary to pull up the output connection part (load connection part), which is located on the underside of the fusible material, to the top of the relay box, resulting in poor workability.

[0008] The present invention aims to provide an electrical connection box that improves workability during maintenance. [Means for solving the problem]

[0009] To solve the aforementioned problems and achieve the objective, the invention described in claim 1 is an electrical junction box for distributing power to a load, comprising: an electrical component; a fuse component mounted on the electrical component for distributing power to the load; and a case housing the electrical component and the fuse component, wherein the fuse component comprises a conductive busbar and an insulating housing covering the busbar, the busbar having a plate-shaped busbar body, a fusible element that melts when an overcurrent flows, and a load connection portion continuous with the busbar body via the fusible element, the load connection portion being positioned above the busbar body and further away from the fusible element, the fuse component being configured to be pullable upward from the electrical component, and the load connection portion being exposed upward from the case when pulled upward from the electrical component. The electrical component comprises an electrical component body and a rectangular mounting base provided at the end of the electrical component body, the mounting base having a slit extending in the vertical direction, the busbar having an insertion portion extending from the busbar body and inserted into the slit, and an overlapping portion where the upper side of the insertion portion is bent and overlaps the upper surface of the mounting base, the load connection portion being provided above the upper surface of the mounting base. This is an electrical junction box characterized by the following features. [Effects of the Invention]

[0010] According to the invention described in claim 1, it is possible to improve work efficiency during maintenance. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view showing an electrical junction box according to one embodiment of the present invention. [Figure 2] This is a view of the configuration shown in Figure 1, seen from above. [Figure 3] This is a perspective view showing the aforementioned electrical junction box disassembled. [Figure 4] This is a perspective view showing the electrical components and fuse components that make up the aforementioned electrical junction box. [Figure 5] This is a view of the aforementioned fuse component from the front. [Figure 6] This is a side view of the aforementioned fuse component. [Figure 7] This diagram shows the electrical components and fuse components housed in the case that constitutes the electrical connection box. [Figure 8] This is a diagram illustrating the assembly procedure for assembling the aforementioned fuse components. [Figure 9] This diagram shows the process after Figure 8. [Figure 10] This diagram shows the process after Figure 9, illustrating the fuse components in their assembled state. [Figure 11] This is a diagram illustrating the operation and effects of this embodiment. [Modes for carrying out the invention]

[0012] One embodiment of the present invention will be described below with reference to Figures 1 to 11. Figure 1 is a perspective view showing an electrical junction box 1 according to one embodiment of the present invention. Figure 2 is a view of the configuration shown in Figure 1 from above Z1. Figure 3 is a perspective view showing the electrical junction box 1 in an exploded view.

[0013] As shown in FIGS. 1 to 3, an electrical connection box 1 according to an embodiment of the present invention includes a relay box 11 as an electrical component in the claims, a fuse component 2 connected between the relay box 11 and a load (not shown) to distribute power to the load, and a case 10 that houses the fuse component 2 and the relay box 11. The case 10 is part of the electrical connection box 1.

[0014] In this embodiment, the vertical direction Z, the left - right direction Y, and the front - back direction X are directions perpendicular to each other. Hereinafter, the direction in which each load terminal connection part 33 (load connection part), which will be described later in the fuse component 2, is arranged is denoted as the left - right direction Y, and the direction in which a slit 135, which will be described later in the relay box 11, extends may be denoted as the vertical direction Z. Also, among the front - back direction X, the direction in which the bolt shaft part 39 of each load terminal connection part 33, which will be described later in the fuse component 2, protrudes is denoted as "front (X1 direction)", and the opposite direction may be denoted as "rear (X2 direction)".

[0015] As shown in FIG. 3, the relay box 11 includes a relay box body 12 as an electrical component body in the claims, and a pair of insertion and fixing parts 13, 13 provided on both sides of the relay box body 12 in the left - right direction Y.

[0016] As shown in FIG. 3, each insertion and fixing part 13 includes an insertion part body 130 and a relay fastening part 131 provided on the insertion part body 130 for fastening a bus bar connection part 31 of the fuse component 2, which will be described later.

[0017] As shown in FIG. 3, the insertion part body 130 includes an installation base 132 formed in a cubic shape, a relay standing wall 133 as a first plate part in the claims, which extends upward Z1 in a plate shape from the front - end of the installation base 132 in the X1 direction, and a relay engaging piece 134 as a first engaging part in the claims, which is provided on the rear - X2 - side surface of the relay standing wall 133 and can engage with a housing engaging part 42 of the fuse component 2, which will be described later.

[0018] As shown in Figure 3, the mounting base 132 has a slit 135 into which the insertion plate portion 34 of the busbar connection portion 31, which will be described later, is inserted. The slit 135 is located adjacent to the rear X2 of the relay mounting wall 133 and extends downward Z2 by cutting out the upper edge Z1 of the mounting base 132. In addition, the relay fastening portion 131, which will be described later, is installed on the upper surface of the mounting base 132.

[0019] As shown in Figure 3, the relay mounting wall 133 is formed in a plate shape including the vertical Z direction and the left-right Y direction. The upper end of this relay mounting wall 133 is formed to be at approximately the same height as the upper surface of the relay box body 12.

[0020] As shown in Figures 3 and 4, the relay fastening section 131 comprises a conductive plate 136 installed on the upper surface of the mounting base 132, and a shaft portion 137 erected upward Z1 from the conductive plate 136. One end of the conductive plate 136 is electrically connected to the relay box body 12. The other end of the conductive plate 136 is provided with the shaft portion 137. As shown in Figure 3, the relay fastening section 131 is configured to be fastened to the busbar connection portion 31 of the fuse component 2, which will be described later, using a nut N with a washer.

[0021] As shown in Figures 5, 6, and 9, the fuse component 2 comprises a busbar 3 made of a conductive metal plate, an insulating housing 4 covering a part of the busbar 3, and a cover 5 (shown in Figures 5 and 9). Figure 5 is a view of the fuse component 2 from the front X1, showing the cover 5 through the glass.

[0022] As shown in Figures 5 and 8, the busbar 3 comprises a plate-shaped busbar body 30, a pair of busbar connection parts 31, 31 provided on both sides of the busbar body 30 in the left-right direction Y and fastened to each relay fastening part 131 of the relay box 11, a fusible element 32 that is continuous with the upper end of the busbar body 30 and is melted when an overcurrent flows, and a load terminal connection part 33 that is continuous with the busbar body 30 via the fusible element 32 and serves as a load connection part according to the claim. That is, each load terminal connection part 33 is located above each fusible element 32 Z1.

[0023] In this embodiment, five fusible elements 32 and five load terminal connection parts 33 (the same number of fusible elements 32 and load terminal connection parts 33) are provided. The five fusible elements 32 are arranged in the left-right direction Y, as shown in Figure 5. Each load terminal connection part 33 is provided continuously above each fusible element 32 Z1, and the five load terminal connection parts 33 are arranged in the left-right direction Y.

[0024] As shown in Figure 8, the busbar body 30 is formed in the shape of a rectangular plate including the vertical Z direction and the left-right Y direction.

[0025] Each pair of busbar connection portions 31, 31, as shown in Figure 8, are provided continuously at both ends of the busbar body 30 in the left-right direction Y and include an insertion plate portion 34 as an insertion portion in the claim, which is inserted into the slit 135 of the relay box 11, an overlapping portion 35 which is bent at the upper end of the insertion plate portion 34 and overlaps the conductive plate 136 of the relay fastening portion 131, and a first hole portion 3a provided in the overlapping portion 35 and inserted into the shaft portion 137 of the relay fastening portion 131.

[0026] Each fusible element 32, as shown in Figure 5, is composed of a narrow section 36 and a low-melting-point metal 37, for example, made of Sn. Each fusible element 32 is configured to melt and interrupt the circuit when an overcurrent flows through the busbar 3. In each fusible element 32, the lower end of the narrow section 36 is continuous with the busbar body 30, and the upper end of the narrow section 36 is continuous with the terminal contact portion 38 of each load terminal connection portion 33, which will be described later. Also, as shown in Figure 8, in the left-right direction Y, the narrow section 36 is configured to have a smaller dimension (narrower width) than the terminal contact portion 38 of each load terminal connection portion 33. Furthermore, the upper end of the narrow section 36 is formed to be approximately the same height as the overlapping portion 35 of each busbar connection portion 31. That is, each load terminal connection portion 33, which will be described later, is located above Z1 than the mounting base 132 that is superimposed on the overlapping portion 35 of each busbar connection portion 31.

[0027] Each load terminal connection portion 33 is configured as shown in Figures 5 and 8, comprising a rectangular plate-shaped terminal contact portion 38 having a second hole portion 3b, and a bolt 39B (shown in Figure 8) having a bolt shaft portion 39 inserted through the second hole portion 3b of the terminal contact portion 38. As shown in Figure 8, the terminal contact portion 38 is provided as a plate-shaped extension including the vertical Z direction and the horizontal Y direction. Furthermore, the load terminal connection portion 33 is supported by a terminal support portion 48 of the housing 4, which will be described later, and is configured so that the terminal contact portion 38 and the bolt shaft portion 39 are exposed to the front X1.

[0028] Furthermore, as shown in Figure 3, each load terminal connection 33 is electrically and mechanically connected to the round terminal 6C of the wire harness 6, which will be described later, using a nut N with a washer.

[0029] As shown in Figure 3, the wire harness 6 comprises a wire 6A whose other end is connected to a load, a terminal portion 6B which is electrically and mechanically connected to the end of one end of the wire 6A by crimping, and a round terminal 6C which is continuous with the terminal portion 6B and connected to each load terminal connection portion 33.

[0030] When connecting a wire harness 6 to each of these load terminal connection parts 33, as shown in Figure 3, the round terminal 6C of the wire harness 6 is brought close to the terminal contact part 38 of each load terminal connection part 33, the bolt shaft part 39 is inserted, and the nut N is screwed on in this state. In this way, the wire harness 6 is electrically and mechanically connected to each load terminal connection part 33.

[0031] As shown in Figures 5 and 9, the housing 4 comprises a housing body 40, opposing walls 41 as second plate portions in the claim provided on both sides of the housing body 40 in the left-right direction Y and facing each relay mounting wall 133 of the relay box 11, housing engagement portions 42 as second engagement portions in the claim provided on the opposing walls 41 and capable of engaging with the relay engagement piece 134, reinforcing ribs 43, and pressing projections 44 as contact portions in the claim.

[0032] As shown in Figures 5 and 9, the housing body 40 integrally comprises a covering portion 45 that covers the busbar body 30, a pair of wall portions 46, 46 provided at both ends of the covering portion 45 in the left-right direction Y and facing each other in the left-right direction Y, four (or more) insulating walls 47 provided between the pair of wall portions 46, 46 to insulate adjacent fusible bodies 32 from each other, and terminal support portions 48 that support each load terminal connection portion 33, which are continuous with the wall portions 46 and insulating walls 47 above Z1.

[0033] As shown in Figures 5 and 9, the covering portion 45 is provided with a locking receiving portion 49 that engages with the cover locking portion 52 of the cover 5, which will be described later. As shown in Figure 9, the locking receiving portion 49 is provided at the lower end of the covering portion 45, protruding in the front-rear direction X, and is configured to be able to engage with the cover locking portion 52 of the cover 5, which will be described later.

[0034] As shown in Figures 5 and 9, the pair of wall portions 46, 46 are provided at the boundary between the busbar body 30 and each busbar connection portion 31, and are configured to protrude downward Z2 from the lower end of the covering portion 45. The four insulating walls 47 are provided facing each other in the left-right direction Y.

[0035] As shown in Figures 5 and 9, the terminal support portion 48 comprises an unillustrated mounting surface that supports the rear X2 side of the terminal contact portion 38 at each load terminal connection portion 33, a pair of inner surfaces 4A, 4A facing each other in the left-right direction Y, an arc-shaped surface 4B continuous with the upper Z1 of the pair of inner surfaces 4A, 4A, and a partition portion 481 that spans between the pair of inner surfaces 4A, 4A and is provided at the boundary position of each fusible body 32 and each load terminal connection portion 33, and is configured to open to the front X1. As shown in Figure 3, this partition portion 481 is provided in front X1 of each fusible body 32 and each load terminal connection portion 33 and is configured to support the round terminal 6C of the wire harness 6 when the round terminal 6C is connected to each load terminal connection portion 33.

[0036] The housing engagement portion 42 is configured to engage with the relay engagement piece 134 when each insertion plate portion 34 of each busbar connection portion 31 of the busbar 3 is inserted into each slit 135 of the relay box 11, and the overlapping portion 35 of each busbar connection portion 31 overlaps with the conductive plate 136 installed on the upper surface of the mounting base 132 of the relay box 11. In other words, the housing engagement portion 42 is configured to approach and engage with the relay engagement piece 134 from above Z1.

[0037] As shown in Figures 5 and 6, the reinforcing ribs 43 are provided at the boundary between each wall portion 46 of the housing body 40 and each opposing wall 41, at the same height as the upper and lower ends of each opposing wall 41. Furthermore, each reinforcing rib 43 is configured to have an inclination such that it approaches the opposing wall 41 as it moves away from each wall portion 46.

[0038] As shown in Figures 6 and 9, the pressing projection 44 is provided projecting rearward X2 from the housing body 40. This pressing projection 44 is provided projecting in the opposite direction (rearward X2) to the direction in which the housing engagement portion 42 protrudes (forward X1). Also, as shown in Figure 6, the pressing projection 44 is provided at the boundary position between each wall portion 46 of the housing body 40 and each opposing wall 41, at the same height as the upper and lower ends of each opposing wall 41. As shown in Figure 7, this pressing projection 44 is configured to press the relay box body 12 when the housing engagement portion 42 and the relay engagement piece 134 are engaged, thereby pressing the opposing wall 41 of the housing 4 against the relay mounting wall 133.

[0039] As shown in Figure 9, the cover 5 comprises a cover body 51 provided between a pair of wall portions 46, 46 of the housing 4 to cover each fusible body 32, and a cover locking portion 52 provided on the inner surface of the cover body 51 to lock into the locking receiving portion 49 of the housing 4.

[0040] As shown in Figure 9, the cover body 51 comprises a rectangular plate-shaped bottom plate 53, a pair of opposing plate portions 54F, 54B that are erected from the bottom plate 53 and face each other in the front-rear direction X, a pair of side plate portions 55, 55 that protrude in the front-rear direction X from both ends of the opposing plate portions 54F, 54B in the left-right direction Y, and an insertion portion 56 provided between the pair of side plate portions 55, 55 for inserting the covering portion 45.

[0041] Furthermore, as shown in Figure 9, of the pair of opposing plate portions 54F and 54B, the opposing plate portion 54F located at the front X1 is provided with a notch portion 57 formed by cutting out the upper edge of the opposing plate portion 54F and extending downward Z2. There are four notches 57. Each insulating wall 47 of the housing 4 is inserted inside each notch portion 57.

[0042] The cover locking portion 52 is configured such that the covering portion 45 of the housing 4 is inserted into the inside of the cover body 51, and the upper end of the cover body 51 is positioned close to the partition portion 481 of the housing 4, and the locking portion 52 is locked to the locking receiving portion 49 of the housing 4.

[0043] As shown in Figure 7, the case 10 is formed in the shape of a rectangular parallelepiped capable of housing the fuse component 2 and the relay box 11, and has an opening 10A that opens upward Z1. The case 10 is also provided with a pull-out hole 10B for pulling out the other end of the wire 6A of the wire harness 6. The pull-out hole 10B is located on the downward Z2 side of the case 10. Note that in Figure 7, only a portion of the wire 6A is shown, and the state in which the other end of the wire 6A is pulled out from the pull-out hole 10B is not shown.

[0044] Furthermore, as shown in Figure 7, with the fuse component 2 and relay box 11 housed in the case 10, the upper surfaces 2A and 11A (shown only in Figure 7) of the fuse component 2 and relay box 11 are positioned in predetermined locations close to the opening 10A. Also, as shown in Figure 1, with the fuse component 2 and relay box 11 installed in predetermined locations in the case 10, the lower Z2 side of the case 10 is configured to accommodate the excess length of the wire 6A of the wire harness 6 connected to the fuse component 2, and the other end of the wire 6A is pulled out through the exit hole 10B.

[0045] Next, the assembly procedure for fuse component 2 will be explained with reference to Figures 8-10.

[0046] First, a single metal sheet is pressed and bent to form a punched body, as shown in Figure 8, which includes a continuous busbar body 30, a pair of busbar connecting parts 31, 31, each fusible element 32, and terminal contact parts 38 that constitute each load terminal connecting part 33. After this, a bolt shaft 39 is inserted through the second hole 3b of each terminal contact part 38, and in this state, a molded product 20 (shown in Figure 9) is formed in which the punched body and the housing 4 are integrally constructed by insert molding. Note that in Figure 8, the low-melting-point metal 37 of each fusible element 32 is omitted.

[0047] Next, as shown in Figure 9, the cover body 51 is brought close to the lower end of the covering portion 45 on the molded product 20, and the covering portion 45 is inserted into the interior of the cover body 51. As insertion progresses, the covering portion 45 is inserted into each insertion portion 56 of the cover 5, and each insulating wall 47 is inserted into each notch 57. Also, when the upper end of the cover body 51 is close to the partition portion 481 of the housing 4, the cover locking portion 52 is locked into the locking receiving portion 49 of the housing 4. The cover 5 is assembled to the molded product 20 in this way (shown in Figure 10). This completes the assembly of the fuse component 2.

[0048] When mounting such a fuse component 2 in the relay box 11, as shown in Figure 3, each insertion plate portion 34 of each busbar connection portion 31 of the fuse component 2 is inserted close to each slit 135 of the relay box 11.

[0049] As insertion progresses and the opposing wall 41 and the relay mounting wall 133 come into contact, the housing engagement portion 42 and the relay engagement piece 134 engage. At this time, each pressing projection 44 contacts the relay box body 12, pressing the opposing wall 41 toward the relay mounting wall 133.

[0050] Furthermore, the first hole 3a of each busbar connection portion 31 is inserted close to the shaft portion 137 of the relay box 11, and the overlapping portion 35 of each busbar connection portion 31 is placed on the conductive plate 136 of the relay box 11. In this state, the nut N is screwed onto the shaft portion 137. In this way, each busbar connection portion 31 of the fuse component 2 is fastened to the relay fastening portion 131 of the relay box 11. This electrically connects the fuse component 2 and the relay box 11. The fuse component 2 is then mounted on the relay box 11.

[0051] Furthermore, each wire harness 6 is connected to each load terminal connection part 33 of the fuse component 2, and the fuse component 2 and relay box 11 are installed in predetermined positions inside the case 10. This completes the electrical junction box 1. With the electrical junction box 1 completed, the other end of the wire 6A of the wire harness 6 is pulled out from the exit hole 10B.

[0052] When performing maintenance on the electrical connection box 1 described above, in the state shown in Figure 11(A), it is necessary to loosen the nut N of the relay fastening portion 131, remove the nut N to release the connection between each busbar connection portion 31 of the fuse component 2 and the relay fastening portion 131, release the engagement between the housing engagement portion 42 of the fuse component 2 and the relay engagement piece 134 of the relay box 11, and as shown in Figure 11(B), pull the fuse component 2 upward Z1 relative to the relay box 11 to expose each load terminal connection portion 33 from the opening 10A of the case 10, and release the connection between each load terminal connection portion 33 and the round terminal 6C of the wire harness 6.

[0053] In this embodiment, the fuse component 2 constituting the electrical connection box 1 has its load terminal connection portion 33 (load connection portion) positioned above the fusible body 32 in Z1, and is configured to be pullable upward Z1 from the relay box 11 (electrical component). Furthermore, when pulled upward Z1 from the relay box 11, the load terminal connection portion 33 is exposed upward Z1 from the case 10. This configuration allows for a smaller pull-out amount of the fuse component 2 compared to the conventional configuration where the output connection portion (load connection portion) is located below the fusible body, thereby improving workability during maintenance.

[0054] Furthermore, the fuse component 2 is connected to a wire 6A, which is connected to a load terminal connection part 33 (load connection part) and extends downward Z2 inside the case 10. This reduces the amount of wire 6A that can be pulled out from the fuse component 2, thereby reducing the excess length of the wire 6A and reducing the space required in the case 10 to accommodate the excess length of the wire 6A.

[0055] Furthermore, the relay box 11 (electrical component) comprises a relay box body 12 (electrical component body) and a rectangular mounting base 132 provided at the end of the relay box body 12. The mounting base 132 has a slit 135 extending in the vertical direction Z. The busbar 3 has an insertion plate portion 34 (insertion portion) extending from the busbar body 30 and inserted into the slit 135, and an overlapping portion 35 where the upper Z1 side of the insertion plate portion 34 is bent and overlaps the upper surface of the mounting base 132. The load terminal connection portion 33 (load connection portion) is provided above Z1 above the upper surface of the mounting base 132. With this configuration, the fuse component 2 can be pulled out upward Z1 from the relay box 11, and when pulled out upward Z1 from the relay box 11, the load terminal connection portion 33 is exposed upward Z1 from the case 10.

[0056] Furthermore, the relay box 11 (electrical component) includes a relay mounting wall 133 (first plate portion) that protrudes in a plate shape upward Z1 from the mounting base 132, and a relay engaging piece 134 (first engaging portion) provided on the slit 135 side (rear X2) of the relay mounting wall 133. The housing 4 includes a housing body 40 that holds the busbar body 30, an opposing wall 41 (second plate portion) that extends from the housing body 40 and faces the relay mounting wall 133, and a housing engaging portion 42 (second engaging portion) provided on the opposing wall 41 that engages with the relay engaging piece 134. The relay engaging piece 134 and the housing engaging portion 42 are configured to engage with each other when the overlapping portion 35 overlaps the upper surface of the mounting base 132. Specifically, by inserting the insertion plate portion 34 of the fuse component 2 into the slit 135 of the relay box 11, the overlapping portion 35 overlaps the upper surface of the mounting base 132, and the relay engaging piece 134 and the housing engaging portion 42 engage with each other. This improves the ease of assembly of the electrical connection box 1.

[0057] Furthermore, the housing 4 has a pressing projection 44 (contact portion) that protrudes toward the relay box body 12 (electrical component body) and is capable of contacting the relay box body 12. With the pressing projection 44 in contact with the relay box body 12, the opposing wall 41 (second plate portion) is pressed against the relay mounting wall 133 (first plate portion). As a result, the opposing wall 41 is pressed against the relay mounting wall 133, which firmly maintains the engagement state between the relay engaging piece 134 (first engaging portion) and the housing engaging portion 42 (second engaging portion).

[0058] Furthermore, the present invention is not limited to the embodiments described above, and includes other configurations that can achieve the objectives of the present invention, as well as modifications such as those shown below.

[0059] In the above embodiment, a relay box 11 is described as an example of an electrical component in the claims, but the present invention is not limited thereto. Other electrical components other than the relay box 11 may be used as long as they have a configuration that can accommodate the fuse component 2.

[0060] Furthermore, while the best configurations and methods for carrying out the present invention are disclosed in the above description, the present invention is not limited thereto. That is, although the present invention is particularly illustrated and described with respect to specific embodiments, those skilled in the art can make various modifications to the embodiments described above in terms of shape, material, quantity, and other detailed configurations without departing from the scope of the technical idea and objectives of the present invention. Therefore, the limiting descriptions of shape, material, etc. disclosed above are provided as examples to facilitate understanding of the present invention and do not limit the present invention. Accordingly, descriptions of components with some or all of these limitations removed are included in the present invention. [Explanation of Symbols]

[0061] 1. Electrical junction box 2 Fuse components 3 Busba 4 Housing 6A wire 10 cases 11. Relay box (electrical component) 12. Relay box body (electrical component body) 30 Busbar body 32 Soluble 33. Load terminal connection section (load connection section) 34 Insertion plate section (insertion section) 35 Overlapping parts 40 Housing body 41 Opposing wall (second plate section) 42 Housing engagement portion (second engagement portion) 44 Pressing projection (contact part) 132 Installation stand 133 Relay erection wall (first plate section) 134 Relay engagement part (first engagement part) 135 slits

Claims

1. An electrical junction box for distributing power to loads, The device comprises an electrical component, a fuse component mounted on the electrical component for distributing power to the load, and a case housing the electrical component and the fuse component. The fuse component comprises a conductive busbar and an insulating housing covering the busbar. The busbar comprises a plate-shaped busbar body, a fusible element that melts when an overcurrent flows, and a load connection portion that is continuous with the busbar body via the fusible element. The load connection portion is located above the fusible material, at a distance from the busbar body. The fuse component is configured to be pullable upward from the electrical component, and when pulled upward from the electrical component, the load connection portion is exposed upward from the case. The aforementioned electrical component comprises an electrical component body and a rectangular mounting base provided at the end of the electrical component body, the mounting base having a slit extending in the vertical direction, The busbar has an insertion portion that extends from the busbar body and is inserted into the slit, and an overlapping portion whose upper side is bent and overlaps the upper surface of the mounting base. An electrical connection box characterized in that the load connection portion is located above the upper surface of the mounting base.

2. The fuse component and the load are connected by an electric wire, The electrical connection box according to claim 1, characterized in that the electric wire is connected to the load connection portion and extends downward inside the case.

3. The electrical component comprises a first plate portion that protrudes upward in a plate shape from the mounting base, and a first engaging portion provided on the slit-side surface of the first plate portion. The housing comprises a housing body that holds the busbar body, a second plate portion extending from the housing body and facing the first plate portion, and a second engaging portion provided on the second plate portion and engaging with the first engaging portion. The electrical connection box according to claim 1, characterized in that the first engaging portion and the second engaging portion are configured to engage with each other when the overlapping portion overlaps the upper surface of the mounting base.

4. The housing has a contact portion that protrudes toward the electrical component body and is capable of contacting the electrical component body, The electrical connection box according to claim 3, characterized in that the second plate portion is pressed against the first plate portion while the contact portion is in contact with the main body of the electrical component.

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