Electrical junction box

Abstract

The circuit branching element (20) is arranged outside the frame (40) outside the cylinder part (41), and a cylinder wall (41c) of the cylinder part is provided with an opposite wall body (41f) which is arranged opposite to the circuit branching element outside the cylinder part. The circuit branching element is provided with: a conductive circuit branching member (21) that is interposed between the external power supply (B) and the external load (L1) between the power supply-side wire (WB) and the load-side wire (WL1); and a load-side electrical connection structure (75A) that electrically connects the load-side wire and the circuit branching member outside the frame. A load connecting part (23) of the circuit branch component is arranged outside the frame in a state of being exposed to the side opposite to the opposite wall body (41f) side. The load-side electrical connection structure is a connection structure in which a load-side terminal fitting (TL) of a load-side electrical wire is physically connected to a load connection part of the circuit branching member on the side opposite to the facing wall body side so as to be detachable.

Description

Technical Field

[0001] The invention relates to an electrical junction box. Background Art

[0002] In an electrical connection box, a circuit branching element is provided between an external power source and a load to distribute power from the external power source to a plurality of external loads. The circuit branching element is, for example, a circuit protection element that cuts off power when an overcurrent flows during power supply between the external power source and the external load. The circuit protection element is provided with a circuit protection unit that cuts off power supply. For example, the following patent document 1 discloses such an electrical connection box.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-93888 Summary of the invention

[0006] Technical problem that the invention aims to solve

[0007] However, in an electrical junction box, for example, when performing maintenance on an external load, a load-side wire electrically connected to the external load is sometimes disconnected from a circuit branching element (circuit protection element) and reconnected to the circuit branching element (circuit protection element).

[0008] Therefore, an object of the present invention is to provide an electric connection box with improved installation and removal workability of load-side electric wires.

[0009] Technical solutions to the problem

[0010] The electrical junction box involved in the present invention comprises: an electronic component; an internal conductive component, which electrically connects the electronic component to an external power source; a frame, wherein the frame has a cylinder, the cylinder is composed of a cylinder wall with an opening at least at one end, and the electronic component and the internal conductive component are accommodated and held in the cylinder of the cylinder; a cover component, the cover component closes the opening of the cylinder; and a circuit branching element, the circuit branching element is arranged outside the cylinder of the cylinder outside the frame and is arranged between the external power source and the external load, the internal conductive component has a first electrical connection part and a second electrical connection part, the first electrical connection part is physically and electrically connected to the electronic component in the cylinder of the cylinder, the cylinder wall of the cylinder has an opposing wall body arranged outside the cylinder to oppose the circuit branching element, and the circuit branching element has: a conductive circuit A branch component, which is arranged between a power supply side wire electrically connected to the external power supply and a load side wire electrically connected to the external load; and a load side electrical connection structure, which electrically connects the load side wire and the circuit branch component outside the frame, the circuit branch component having: a power supply connection part, which is electrically connected to the power supply side wire and physically and electrically connected to the second electrical connection part of the internal conductive component; and a load connection part, which is physically and electrically connected to the load side terminal fitting at the end of the load side wire, the circuit branch element is configured so that the load connection part is exposed to the side opposite to the opposite wall body side, and the load side electrical connection structure is a connection structure that physically connects the load side terminal fitting of the load side wire to the load connection part of the circuit branch component on the side opposite to the opposite wall body side so as to be freely and detachably attached and detached.

[0011] In addition, the electrical junction box involved in the present invention comprises: an electronic component; an internal conductive component, which electrically connects the electronic component to an external power supply; a frame, the frame having a cylinder, the cylinder being composed of a cylinder wall with an opening at least at one end, and accommodating and holding the electronic component and the internal conductive component in the cylinder of the cylinder; a cover component, the cover component closing the opening of the cylinder; and a circuit protection element, the circuit protection element is arranged outside the cylinder of the cylinder outside the frame, and cuts off the overcurrent between the external power supply and the external load, the internal conductive component having a first electrical connection part and a second electrical connection part, the first electrical connection part is in the cylinder The inside of the cylinder of the cylinder is physically and electrically connected to the electronic component, and the cylinder wall of the cylinder has an opposing wall body arranged outside the cylinder to oppose the circuit protection element, and the circuit protection element comprises: a conductive circuit protection component, which is a component that cuts off an overcurrent between the external power supply and the external load between a power supply side wire electrically connected to the external power supply and a first load side wire electrically connected to the external load, and can electrically connect a first terminal of an additional circuit protection element for cutting off an overcurrent between the external power supply and an additional external load to be added to the external power supply; an additional power supply side electrical connection structure, which can make the additional circuit protection element The first terminal portion is electrically connected to the circuit protection component outside the frame; and an additional load-side electrical connection structure, which can electrically connect the second load-side wire electrically connected to the additional external load and the second terminal portion of the additional circuit protection element outside the frame, the circuit protection component comprises: a power connection portion, which is electrically connected to the power-side wire and physically and electrically connected to the second electrical connection portion of the internal conductive component; a load connection portion, which is electrically connected to the first load-side wire; a fusible portion, which is arranged between the power connection portion and the load connection portion; an additional electrical connection portion, which is physically and electrically connected to the first terminal portion; and a connecting portion, The additional electrical connection part is connected to the power connection part, and the circuit protection element is configured so that the additional electrical connection part is exposed on the side opposite to the opposite wall body side. The additional power supply side electrical connection structure is a connection structure that allows the first terminal part of the additional circuit protection element to be physically connected to the additional electrical connection part of the circuit protection component on the side opposite to the opposite wall body side in a detachable manner. The additional load side electrical connection structure is a connection structure that allows the load side terminal fitting at the end of the second load side electric wire and the second terminal part of the additional circuit protection element to be physically connected on the side opposite to the opposite wall body side in a detachable manner.

[0012] Effects of the Invention

[0013] The electric connection box according to the present invention can make the load-side electric wire with the load-side terminal fittings detachable from the circuit branching element at a visible location outside the frame, and can also make the second load-side electric wire with the load-side terminal fittings and the additional circuit protection element detachable from the circuit protection element at a visible location outside the frame. Therefore, the electric connection box can improve the detachable workability with respect to these circuit branching elements (circuit protection elements). BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view showing an electric junction box according to the embodiment.

[0015] Figure 2 This is a plan view of the electric connection box (without the first cover member) according to the embodiment as viewed from one opening side of the frame.

[0016] Figure 3 This is a plan view of the electric connection box (without the first cover member) according to the embodiment as seen from the side of the frame.

[0017] Figure 4 It is an exploded perspective view showing the electric junction box (without the first cover member and the second cover member) according to the embodiment.

[0018] Figure 5 It is an exploded perspective view showing a block and an internal conductive component and an external thread component housed in the block.

[0019] Figure 6 It is an exploded perspective view of the frame and the second cover member in the electric connection box (without the first cover member) according to the embodiment.

[0020] Figure 7 This is an exploded perspective view illustrating the electrical connection structure between the circuit protection element and the load side.

[0021] Figure 8 This is a plan view of the electrical connection structure between the circuit protection element and the load side as viewed from the side of the frame of the electrical connection box, showing a state in which the additional circuit protection element is assembled.

[0022] Fig. 9 This is a plan view of the electrical connection structure between the circuit protection element and the load side as viewed from the side of the frame of the electrical connection box, showing a state in which the additional circuit protection element is removed.

[0023] Fig.10 It is a perspective view showing a circuit protection component.

[0024] Fig.11 yes Figure 3 XX line cross-sectional view.

[0025] Fig.12 It is a three-dimensional diagram showing a frame.

[0026] Fig.13 It is a perspective view showing the first divided cover.

[0027] Fig.14 It is a perspective view showing a deformation state of the circuit protection element.

[0028] Fig.15 It is a perspective view showing a deformation mode of the circuit protection component. DETAILED DESCRIPTION

[0029] Hereinafter, an embodiment of the electric connection box of the present invention will be described in detail based on the drawings. However, the present invention is not limited to the embodiment.

[0030] [Implementation Method]

[0031] based on Figures 1 to 15 One embodiment of the electric connection box according to the present invention will be described.

[0032] Figures 1 to 4 Reference numeral 1 denotes an electrical connection box of the present embodiment. The electrical connection box 1 is mounted on a vehicle such as an automobile, and is interposed between an external power source B such as a secondary battery in the vehicle and an external load L1 such as a power distribution object (for example, an auxiliary device to be powered), so that the power of the external power source B is supplied to the external load L1 ( Figure 1 In addition, the electrical connection box 1 can also correspond to an external load to be installed on the vehicle later, that is, an additional external load L2 to be added. When the additional external load L2 is added to the vehicle, the external power supply B is interposed between the external power supply B and the additional external load L2, so that the power of the external power supply B is supplied to the additional external load L2 ( Figure 1 ).

[0033] The electrical connection box 1 includes electronic components 10 such as relays and fuses. Figure 2 ), so that the electronic component 10 is interposed between the external power source B and the external load L1. In addition, when the external load L2 is added to the vehicle, the electronic component 10 is interposed between the external power source B and the additional external load L2. Furthermore, the electrical connection box 1 includes a circuit branching element 20 ( Figures 1 to 4 ). The circuit branching element 20 is an element for distributing electric power from the external power source B to a plurality of external loads L. The electric connection box 1 includes a plurality of electronic components 10 and at least one circuit branching element 20 .

[0034] Here, the circuit branching element 20 has at least a power supply connection portion 22 and a load connection portion 23, which will be described later. In addition, the circuit branching element 20 has a connection portion 25, which will be described later, which electrically connects the power supply connection portion 22 and a plurality of load connection portions 23. However, the circuit branching element 20 shown here has a fusible portion 24, which will be described later, for cutting off an overcurrent between the external power supply B and the external load L, in addition to the power supply connection portion 22 and the load connection portion 23, and has the connection portion 25, which will be described later. That is, here, as an example of the circuit branching element 20, a circuit protection element for cutting off an overcurrent between the external power supply B and the external load L is cited.

[0035] When the additional external load L2 is added to the vehicle, the electrical connection box 1 also interposes the circuit branch element (circuit protection element) 20 between the external power source B and the additional external load L2 ( Figures 1 to 4 For example, as described later, the circuit protection element 20 is configured to cut off an overcurrent between the external power source B and the additional external load L2 when an additional external load L2 is added to the vehicle.

[0036] The electrical connection box 1 comprises: a block 30, which holds the electronic component 10; and a frame 40, which has a cylinder 41, the cylinder 41 is composed of a cylinder wall 41c with both ends (openings 41a, 41b) of which the block 30 is accommodated and held in the cylinder. Figures 1 to 6 ). In addition, the electrical connection box 1 includes: a cover member (hereinafter referred to as a "first cover member") 51 for closing an opening 41a in the barrel 41; and a cover member (hereinafter referred to as a "second cover member") 52 for closing the other opening 41b in the barrel 41 ( Figure 1 , Figure 3 and Figure 6 The block 30, the frame 40, the first cover member 51, and the second cover member 52 are formed of an insulating material such as synthetic resin.

[0037] In the electric connection box 1, the frame 40, the first cover member 51 and the second cover member 52 form a housing in which electric wires (not shown) electrically connected to the electronic components 10 are routed and led out of the housing through an opening.

[0038] In the frame 40, the block 30 is inserted into the cylinder of the cylinder 41 from the other opening 41b. When the frame 40 is composed of one cylinder 41, the outer wall constituting the outer frame thereof is entirely formed by the cylinder wall 41c of the cylinder 41. In addition, when the frame 40 is composed of a combination of a plurality of cylinders 41 whose opening directions of one opening 41a are respectively consistent and whose opening directions of another opening 41b are respectively consistent, the outer wall constituting the outer frame thereof is formed by a combination of a part of the cylinder walls 41c of the plurality of cylinders 41. That is, all or a part of the outer wall constituting the outer frame of the frame 40 is formed by the cylinder wall 41c of the cylinder 41.

[0039] The frame 40 shown here is composed of two cylinders 41, and is mounted on the vehicle in a manner such that one opening 41a faces upward. The first cover member 51 shown here is provided for each cylinder 41. In addition, the second cover member 52 shown here is divided into a first split cover 52A and a second split cover 52B that can be assembled with each other, and the other opening 41b of each of the two cylinders 41 is closed in the form of the first split cover 52A and the second split cover 52B assembled ( Figure 1 , Figure 3 as well as Figure 6 ).

[0040] The electrical connection box 1 electrically connects the electronic component 10 to the external power supply B and includes an internal conductive member 60 ( Figure 4 and Figure 5 The internal conductive component 60 has a first electrical connection portion 61 ( ) which is physically and electrically connected to the electronic component 10 in the cylinder of the cylinder 41. Figure 5 The first electrical connection portion 61 is provided for each electronic component 10. In addition, the internal conductive component 60 has a second electrical connection portion 62 ( Figure 4 and Figure 5 In the internal conductive component 60, a plurality of first electrical connection portions 61 and a second electrical connection portion 62 are connected via a connecting portion 63 ( Figure 5 ).

[0041] Here, as described later, in the electrical connection box 1, the circuit protection element 20 is arranged outside the frame 40 outside the cylinder 41. Therefore, the internal conductive member 60 shown here has a shape in which the connecting portion 63 is extended outside the cylinder 41, and the second electrical connecting portion 62 is connected to the connecting portion 63 outside the frame 40 in the direction of the extension. That is, the second electrical connecting portion 62 shown here is arranged outside the cylinder 41 outside the frame 40.

[0042] The internal conductive component 60 is a so-called bus bar, and is formed into a plate shape using a metal plate as a base material, for example. The block 30 has a block body 31 ( Figure 1 , Figure 2 as well as Figures 4 to 6 ).

[0043] Furthermore, the electrical connection box 1 may include a frame 40 integrated with the block 30. The frame 40 is composed of a cylinder wall 41c having an opening 41a at at least one end, and has a cylinder portion 41 in which the electronic component 10 and the internal conductive member 60 are accommodated and held. For example, the electrical connection box 1 may include the first cover member 51 and the second cover member 52 as in the previous example, as long as the frame 40 includes the cylinder portion 41 composed of the cylinder wall 41c having openings at both ends (openings 41a and 41b). On the other hand, if the frame 40 includes the cylinder portion 41 composed of the cylinder wall 41c having only the opening 41a (i.e., the cylinder portion 41 having the opening 41b closed), the electrical connection box 1 only includes the first cover member 51.

[0044] The circuit branching element 20 includes a conductive circuit branching component 21 ( Figure 4 and Figures 7 to 10 ). As described above, here, a circuit protection element is cited as an example of the circuit branching element 20. Therefore, the circuit branching element (circuit protection element) 20 shown here has a conductive circuit protection component between the external power source B and the external load L as the circuit branching component 21. The circuit branching element (circuit protection element) 20 is arranged outside the frame 40 outside the tube of the tube 41.

[0045] The circuit branching element (circuit protection element) 20 is a component interposed between a power supply side wire WB electrically connected to the external power supply B and a first load side wire WL1 electrically connected to the external load L1, and has a circuit branching component (circuit protection component) 21 ( Figure 4 and Figures 7 to 10 ). The circuit branch component (circuit protection component) 21 is provided to cut off the overcurrent between the external power supply B and at least one external load L1. The circuit branch component (circuit protection component) 21 shown here is provided to cut off the overcurrent between the external power supply B and four external loads L1, and has four sets of combinations of load connection parts 23 and fusible parts 24 described below.

[0046] The circuit branching component (circuit protection component) 21 has a power supply connection portion 22 ( Figure 4 , Figure 7and Fig.10 The power connection portion 22 shown here physically and electrically connects the power supply side terminal fitting TB at the end of the power supply side electric wire WB to the second electrical connection portion 62 of the internal conductive member 60 .

[0047] In addition, the circuit branching component (circuit protection component) 21 includes: a load connection portion 23, which is electrically connected to the first load-side wire WL1; and a fusible portion 24, which is provided between the power connection portion 22 and the load connection portion 23 and melts when an overcurrent flows ( Figure 7 and Fig.10 In the circuit branching component (circuit protection component) 21, the load connection portion 23 and the fusible portion 24 are provided for each external load L1. In addition, the circuit branching component (circuit protection component) 21 has a connection portion 25 ( Fig.10 The power supply connection portion 22 and the fusible portion 24 provided for each external load L1 are connected to the connection portion 25 .

[0048] The circuit branching component (circuit protection component) 21 is a so-called bus bar, and is formed into a plate shape using, for example, a metal plate as a base material. In the circuit branching component (circuit protection component) 20, a resin portion 26 ( Figure 4 and Figures 7 to 9 ). In addition, in the circuit branching element (circuit protection element) 20, a transparent resin cover 27 made of a synthetic resin material that covers the exposed fusible portion 24 is assembled to the resin portion 26 ( Figure 4 and Figures 7 to 9 ).

[0049] The circuit branching element (circuit protection element) 20 includes a power supply side electrical connection structure 70 ( ) for electrically connecting the power supply side wire WB, the internal conductive member 60, and the circuit branching member (circuit protection member) 21. Figure 2 , Figure 4 , Figure 5 as well as Fig.11 ). The power supply side electrical connection structure 70 is arranged outside the frame 40 outside the barrel of the barrel portion 41. Therefore, the power supply side electrical connection structure 70 electrically connects the power supply side wire WB, the internal conductive component 60, and the circuit branch component (circuit protection component) 21 outside the frame 40. The power supply side electrical connection structure 70 shown here physically and electrically connects the power supply side terminal fitting TB at the end of the power supply side wire WB, the second electrical connection portion 62 of the internal conductive component 60, and the power supply connection portion 22 of the circuit branch component (circuit protection component) 21 outside the frame 40.

[0050] The power supply side electrical connection structure 70 adopts a connection structure that physically connects the power supply side terminal fitting TB at the end of the power supply side electric wire WB to the second electrical connection part 62 of the internal conductive component 60 and the power supply connection part 22 of the circuit branch component (circuit protection component) 21. The power supply side electrical connection structure 70 shown here is a connection structure that physically connects the power supply side terminal fitting TB to the second electrical connection part 62 and the power supply connection part 22 so that it can be freely attached and detached, and includes: an external thread component 71, a thread holding component 72 that holds the external thread component 71 in a state where the external thread part is exposed, and an internal thread component 73 ( Figure 4 , Figure 5 as well as Fig.11 The power supply side electrical connection structure 70 is configured such that the external threaded portion of the external threaded component 71 is inserted into the through holes TBa, 62a, 22a provided in the power supply side terminal fitting TB, the second electrical connection portion 62 of the internal conductive component 60, and the power supply connection portion 22 of the circuit branching component (circuit protection component) 21, respectively, and the internal threaded component 73 is screwed into the external threaded portion, thereby fastening and fixing the power supply side terminal fitting TB, the second electrical connection portion 62 of the internal conductive component 60, and the power supply connection portion 22 of the circuit branching component (circuit protection component) 21 together ( Figure 4 and Figure 5 That is, the power supply side electrical connection structure 70 is a common fastening and fixing structure in which the power supply side terminal fitting TB, the second electrical connection portion 62 and the power supply connection portion 22 are threadedly fastened by the external thread component 71 and the internal thread component 73 .

[0051] Here, in the power supply side electrical connection structure 70, the external thread component 71 is configured in such a manner that the thread axis of the external thread portion is aligned with the vertical direction (i.e., the vertical direction of the vehicle) and the external thread portion protrudes from the thread retaining component 72 toward the vertical upper side (i.e., above the vehicle).

[0052] In addition, the circuit branching element (circuit protection element) 20 includes a load-side electrical connection structure 75A ( ) for electrically connecting the first load-side electric wire WL1 and the circuit branching component (circuit protection component) 21. Figure 3 , Figure 4 and Figures 7 to 9 ). The load-side electrical connection structure 75A is arranged outside the frame 40 outside the barrel of the barrel portion 41. Therefore, the load-side electrical connection structure 75A electrically connects the first load-side wire WL1 and the circuit branch component (circuit protection component) 21 outside the frame 40. A load-side terminal fitting TL ( Figure 3 and Figures 7 to 9The load-side electrical connection structure 75A physically and electrically connects the load-side terminal fitting TL to the load connection portion 23 of the circuit branch component (circuit protection component) 21 outside the frame 40. When there are a plurality of external loads L1, the load-side electrical connection structure 75A is provided for each of the external loads L1.

[0053] The load-side electrical connection structure 75A is a connection structure that physically connects the load-side terminal fitting TL at the end of the first load-side electric wire WL1 to the load connection portion 23 of the circuit branching component (circuit protection component) 21. The load-side electrical connection structure 75A shown here is a connection structure that physically connects the load-side terminal fitting TL to the load connection portion 23 so that it can be freely attached or detached, and includes: an external thread component 76 and an internal thread component 77 ( Figure 7 ). The external threaded component 76 is provided so that the external threaded portion of the external threaded component 76 is inserted into the through hole 23a of the load connecting portion 23 of the circuit branching component (circuit protection component) 21 ( Figure 8 ) and the resin portion 26 is integrally formed in a state where the external thread portion is exposed. The load-side electrical connection structure 75A is formed by inserting the external thread portion of the external thread component 76 into the through hole TLa provided in the load-side terminal fitting TL and screwing the internal thread component 77 with the external thread portion, thereby fastening and fixing the load-side terminal fitting TL and the load connection portion 23 of the circuit branch component (circuit protection component) 21 together ( Figure 7 That is, the load-side electrical connection structure 75A is a common fastening and fixing structure in which the load-side terminal fitting TL and the load connecting portion 23 are screwed together by the external thread member 76 and the internal thread member 77 .

[0054] Here, in the load-side electrical connection structure 75A, the external thread member 76 ( Figure 4 and Figures 6 to 9 For example, the tube wall 41c of the tube portion 41 has an opposing wall body 41f ( Figure 2 , Figure 4 , Figure 5 , Fig.11 as well as Fig.12). In the electrical junction box 1, the circuit branching element (circuit protection element) 20 is arranged in a state where the load connection portion 23 is exposed on the side opposite to the opposing wall body 41f side. And, in the load-side electrical connection structure 75A, the external thread component 76 is arranged in a form where the external thread portion protrudes from the through hole 23a of the load connection portion 23 to the side opposite to the opposing wall body 41f side. That is, the load-side electrical connection structure 75A is a connection structure that allows the load-side terminal fitting TL at the end of the first load-side electric wire WL1 to be physically connected to the load connection portion 23 of the circuit protection component 21 on the side opposite to the opposing wall body 41f side (in other words, a visible portion outside the frame 40) in a detachable manner, and they can be threadedly fastened by the external thread component 76 and the internal thread component 77 on the side opposite to the opposing wall body 41f side. Therefore, the load-side electrical connection structure 75A can perform the disassembly and assembly of the internal thread component 77 relative to the external thread component 76 when the circuit branch component (circuit protection component) 20 is assembled on the frame 40, so that the first load-side electric wire WL1 with the load-side terminal accessory TL can be disassembled relative to the load connection part 23 of the circuit branch component (circuit protection component) 21.

[0055] In this example, the external thread member 76 is arranged so that the thread axis of the external thread portion is aligned with the orthogonal direction with respect to the vertical direction (ie, the vehicle up-down direction) and the external thread portion protrudes toward the side opposite to the facing wall body 41f.

[0056] In addition, as long as the load-side electrical connection structure 75A does not perform disassembly of the first load-side electric wire WL1 with the load-side terminal fitting TL when the circuit branch element (circuit protection element) 20 is assembled to the frame 40, the external threaded component 76 (not shown) can be configured in a form in which the external threaded portion protrudes toward the barrel wall 41c side (i.e., the opposing wall 41f side) of the barrel 41.

[0057] The circuit branching element (circuit protection element) 20 is configured to have an additional circuit protection element 29 ( Figures 1 to 4 as well as Figures 6 to 9 ) is a post-installed structure. The additional circuit protection element 29 is a circuit protection element that can be freely installed and removed relative to the circuit branch element (circuit protection element) 20, so that the circuit protection part (omitted from the figure) such as the fusible part exists between the first terminal part 29a at one end and the second terminal part 29b at the other end. In the additional circuit protection element 29, the first terminal part 29a, the second terminal part 29b and the circuit protection part are provided on a plate-shaped circuit protection component such as a bus bar.

[0058] First, the circuit branching component (circuit protection component) 21 is configured to electrically connect the first terminal portion 29a of the additional circuit protection element 29 to the external power supply B ( Figures 1 to 4 as well as Figures 6 to 9 The circuit branch component (circuit protection component) 21 has an additional electrical connection portion 25a ( ) that is physically and electrically connected to the first terminal portion 29a of the additional circuit protection element 29. Figures 7 to 10 ). In the circuit branch component (circuit protection component) 21, the additional electrical connection portion 25a is connected to the power connection portion 22, so that the additional electrical connection portion 25a is electrically connected to the external power supply B. Here, the additional electrical connection portion 25a is provided on the connection portion 25, and the additional electrical connection portion 25a is exposed from the resin portion 26. Moreover, here, on the basis of exposing the additional electrical connection portion 25a to the outside, in order to physically and electrically connect the first terminal portion 29a of the additional circuit protection element 29 to the additional electrical connection portion 25a, a cutout portion 27a is provided in the resin cover 27 ( Figures 7 to 9 ).

[0059] The circuit branching element (circuit protection element) 20 includes an additional power supply side electrical connection structure 78 (which can electrically connect the first terminal portion 29a of the additional circuit protection element 29 corresponding to the additional external load L2 and the circuit branching component (circuit protection component) 21 when an additional external load L2 is added. Figure 3 , Figure 4 as well as Figures 7 to 9 ). The additional power supply side electrical connection structure 78 is arranged outside the tube of the tube portion 41 and outside the frame 40. Therefore, the additional power supply side electrical connection structure 78 electrically connects the first terminal portion 29a of the additional circuit protection element 29 and the circuit protection component 21 outside the frame 40. The additional power supply side electrical connection structure 78 shown here physically and electrically connects the first terminal portion 29a of the additional circuit protection element 29 and the additional electrical connection portion 25a of the circuit branch component (circuit protection component) 21 outside the frame 40. When there are multiple additional external loads L2, the additional power supply side electrical connection structure 78 is provided for each of the additional external loads L2.

[0060] The additional power supply side electrical connection structure 78 adopts a connection structure that allows the first terminal portion 29a of the additional circuit protection element 29 to be physically connected to the additional electrical connection portion 25a of the circuit branch component (circuit protection component) 21 in a detachable manner. The additional power supply side electrical connection structure 78 shown here includes the same external thread component 76 and internal thread component 77 ( Figures 7 to 9 The external thread portion of the external thread member 76 is inserted into the through hole 25b of the additional electrical connection portion 25a ( Fig.10The resin portion 26 is formed integrally with the external thread member 76 and the additional electrical connection portion 25a, while exposing the additional electrical connection portion 25a and exposing the external thread portion of the external thread member 76 inserted into the through hole 25b of the additional electrical connection portion 25a.

[0061] The additional power supply side electrical connection structure 78 is formed by inserting the external thread portion of the external thread component 76 into the through hole 29c of the first terminal portion 29a of the additional circuit protection element 29, and screwing the internal thread component 77 with the external thread portion, thereby fastening and fixing the first terminal portion 29a and the additional electrical connection portion 25a of the circuit branch component (circuit protection component) 21 together ( Figure 7 That is, the additional power source side electrical connection structure 78 is a common fastening and fixing structure in which the first terminal portion 29 a and the additional electrical connection portion 25 a are screwed together by the external thread member 76 and the internal thread member 77 .

[0062] Next, the circuit branching element (circuit protection element) 20 includes an additional load-side electrical connection structure 75B, which can electrically connect the second load-side wire WL2 electrically connected to the additional external load L2 and the second terminal portion 29b of the additional circuit protection element 29 when an additional external load L2 is added ( Figure 3 , Figure 4 as well as Figures 7 to 9 ). The additional load-side electrical connection structure 75B is arranged outside the frame 40 outside the cylinder 41. Therefore, the additional load-side electrical connection structure 75B electrically connects the second load-side wire WL2 and the second terminal portion 29b of the additional circuit protection element 29 outside the frame 40. A load-side terminal fitting TL ( Figure 3 and Figures 7 to 9 The additional load side electrical connection structure 75B physically and electrically connects the load side terminal fitting TL and the second terminal portion 29b outside the frame 40. When there are a plurality of additional external loads L2, the additional load side electrical connection structure 75B is provided for each of the additional external loads L2.

[0063] The additional load-side electrical connection structure 75B adopts a connection structure that allows the load-side terminal fitting TL at the end of the second load-side electric wire WL2 to be detachably physically connected to the second terminal portion 29b of the additional circuit protection element 29. The additional load-side electrical connection structure 75B shown here has the same external thread member 76 and internal thread member 77 as the load-side electrical connection structure 75A ( Figure 7 and Figure 8The external threaded portion of the external threaded component 76 is inserted through the through hole TLa of the load-side terminal fitting TL of the second load-side electric wire WL2 and the through hole 29d of the second terminal portion 29b. The additional load-side electrical connection structure 75B includes a plate-shaped additional conductive component 79, which has a through hole 79a for the external threaded portion of the external threaded component 76 to be inserted through, and one of the load-side terminal fitting TL and the second terminal portion 29b, through which the external threaded portion is inserted, is in surface contact with the additional conductive component 79 ( Figures 7 to 9 The resin portion 26 is integrally formed with the external thread member 76 and the additional conductive member 79. The resin portion 26 is integrally formed with the external thread member 76 and the additional conductive member 79 in a state where the contact surface of the additional conductive member 79 that contacts the load-side terminal fitting TL or the second terminal portion 29b is exposed and the external thread portion of the external thread member 76 inserted into the through hole 79a of the additional conductive member 79 is exposed.

[0064] In the additional load-side electrical connection structure 75B, the external thread portion of the external thread member 76 is inserted into the through hole 29d of the second terminal portion 29b of the additional circuit protection element 29, and the external thread portion is inserted into the through hole TLa of the load-side terminal fitting TL of the second load-side electric wire WL2, and the internal thread member 77 is screwed into the external thread portion, so that the load-side terminal fitting TL and the second terminal portion 29b of the additional circuit protection element 29 are fastened and fixed together ( Figure 7 That is, the additional load-side electrical connection structure 75B is a common fastening and fixing structure in which the load-side terminal fitting TL and the second terminal portion 29 b are screwed together by the external thread member 76 and the internal thread member 77 .

[0065] Here, in the additional power supply side electrical connection structure 78 and the additional load side electrical connection structure 75B, the external thread member 76 ( Figure 4 and Figures 6 to 9). In the electrical junction box 1, the circuit branching element (circuit protection element) 20 is arranged in a state that the additional electrical connection portion 25a and the additional conductive component 79 are exposed on the side opposite to the opposing wall body 41f. Moreover, in the additional power supply side electrical connection structure 78, the external thread component 76 is arranged in a form in which the external thread portion protrudes from the through hole 25b of the additional electrical connection portion 25a to the side opposite to the opposing wall body 41f. That is, the additional power supply side electrical connection structure 78 is a connection structure that allows the first terminal portion 29a of the additional circuit protection element 29 to be physically connected to the additional electrical connection portion 25a of the circuit branching component (circuit protection component) 21 on the side opposite to the opposing wall body 41f (in other words, a visible portion outside the frame 40) in a freely detachable manner, and they can be threadedly fastened by the external thread component 76 and the internal thread component 77 on the side opposite to the opposing wall body 41f. In the additional load-side electrical connection structure 75B, the external thread member 76 is arranged in a form in which the external thread portion protrudes from the through hole 79a of the additional conductive member 79 to the side opposite to the opposing wall body 41f side. That is, the additional load-side electrical connection structure 75B is a connection structure that allows the load-side terminal fitting TL at the end of the second load-side electric wire WL2 and the second terminal portion 29b of the additional circuit protection element 29 to be detachably physically connected to the additional conductive member 79 on the side opposite to the opposing wall body 41f side (in other words, a visible portion outside the frame 40), and the load-side terminal fitting TL and the second terminal portion 29b can be screwed together with the additional conductive member 79 on the side opposite to the opposing wall body 41f side by the external thread member 76 and the internal thread member 77. Therefore, the additional power supply side electrical connection structure 78 and the additional load side electrical connection structure 75B respectively perform disassembly and assembly of the internal thread component 77 relative to the external thread component 76 in a state where the circuit branch element (circuit protection element) 20 is assembled to the frame 40, thereby enabling the second load side electric wire WL2 with the load side terminal accessory TL and the additional circuit protection element 29 to be disassembled relative to the circuit branch element (circuit protection element) 20.

[0066] In the additional power supply side electrical connection structure 78 and the additional load side electrical connection structure 75B of this example, the external thread component 76 is configured in a manner such that the thread axis of each external thread portion is consistent with an orthogonal direction relative to the vertical direction (i.e., the up and down direction of the vehicle) and each external thread portion protrudes toward the side opposite to the opposing wall body 41f.

[0067] In the circuit branching element (circuit protection element) 20, at least one set of combination of the additional electrical connection portion 25a and the additional load side electrical connection structure 75B (in other words, a combination of the additional power side electrical connection structure 78 and the additional load side electrical connection structure 75B) is provided. That is, in the circuit branching element (circuit protection element) 20, when there is only one additional external load L2 to be added, it is sufficient to provide one set of combination of the additional electrical connection portion 25a and the additional load side electrical connection structure 75B (a combination of the additional power side electrical connection structure 78 and the additional load side electrical connection structure 75B). On the other hand, in the circuit branching element (circuit protection element) 20, when a plurality of additional external loads L2 to be added are predetermined, it is sufficient to provide a plurality of combinations of the additional electrical connection portion 25a and the additional load side electrical connection structure 75B (a combination of the additional power side electrical connection structure 78 and the additional load side electrical connection structure 75B) greater than the predetermined number.

[0068] In addition, here, from the viewpoint of commonality of components, the additional power supply side electrical connection structure 78 and the additional load side electrical connection structure 75B are provided with the same external thread member 76 and internal thread member 77 as the load side electrical connection structure 75A, but the additional power supply side electrical connection structure 78 and the additional load side electrical connection structure 75B may be constituted by external thread members and internal thread members different from these. In addition, here, from the viewpoint of commonality of components, the same load side terminal fitting TL as the first load side wire WL1 is attached to the second load side wire WL2, but a load side terminal fitting different from the load side terminal fitting TL of the first load side wire WL1 may be attached to the end of the second load side wire WL2.

[0069] Specifically, the circuit branching element (circuit protection element) 20 is arranged outside the frame 40 as follows.

[0070] The frame 40 has a recessed portion 42 in which the outer wall forming the outer frame of the frame 40 is recessed toward the inner side of the tube portion 41 to arrange the circuit branching element (circuit protection element) 20 ( Figures 2 to 4 and Fig.12 The recess 42 is preferably formed to have a volume equal to or greater than the volume of the circuit branching element (circuit protection element) 20 and to be able to accommodate the circuit branching element (circuit protection element) 20 without protruding.

[0071] In addition, the frame 40 has a secondary cylinder portion 43, which has an opening 43a provided in the same direction as the opening 41a of the cylinder portion 41 and protrudes from the cylinder wall 41c of the cylinder portion 41 to the outside of the frame 40 ( Figures 1 to 4 , Figure 6 , Fig.11 as well as Fig.12). The secondary cylinder portion 43 is disposed in the recess 42 of the frame 40. The secondary cylinder portion 43 shown here is formed as a cylinder with openings at both ends (openings 43a, 43b). Therefore, in the secondary cylinder portion 43, one opening 43a is arranged on the side of one opening 41a of the cylinder portion 41, and the other opening 43b is arranged on the side of the other opening 41b of the cylinder portion 41.

[0072] A power supply side electrical connection structure 70 is provided in the cylinder of the secondary cylinder portion 43. In the secondary cylinder portion 43, the threaded retaining component 72 of the power supply side electrical connection structure 70 is accommodated in the cylinder, and the external threaded portion of the external threaded component 71 in the power supply side electrical connection structure 70 is made to protrude from an opening 43a. Therefore, the second electrical connection portion 62 of the internal conductive component 60 makes the external threaded portion of the external threaded component 71 protruding from an opening 43a of the secondary cylinder portion 43 be inserted into the through hole 62a on the side of an opening 41a of the cylinder portion 41 that is closer to the one opening 43a. Therefore, the cylinder wall 41c of the cylinder portion 41 has a cutout 44 ( Figure 4 and Fig.11 The cutout 44 is a cutout formed by cutting the tube wall 41 c of the tube portion 41 from the end portion on the other opening 41 b side toward the one opening 41 a , and is cut to the side closer to the one opening 41 a of the tube portion 41 than the one opening 43 a of the secondary tube portion 43 .

[0073] The block 30 has a protruding block portion 32 ( 40 ) which protrudes from the notch 44 to the outside of the cylinder 41 and is accommodated in the cylinder of the secondary cylinder 43. Figure 4 and Figure 5 ). A screw holding member 72 is assembled to the protruding block portion 32, thereby holding the power supply side electrical connection structure 70.

[0074] In the electric connection box 1, the external threaded portion of the external threaded member 71 of the power-side electrical connection structure 70 is inserted into the through hole 62a of the second electrical connection portion 62 of the internal conductive member 60, while the internal conductive member 60 is held in the block body 31 and the power-side electrical connection structure 70 is held in the protruding block 32. In the electric connection box 1, the block body 31 holding the internal conductive member 60 is inserted into the cylinder of the cylinder 41 from the other opening 41b, and the protruding block 32 holding the power-side electrical connection structure 70 is inserted into the cylinder of the secondary cylinder 43 from the other opening 43b together with the second electrical connection portion 62 of the internal conductive member 60. In the electric connection box 1, the protruding block 32, the power-side electrical connection structure 70, and the second electrical connection portion 62 of the internal conductive member 60 are accommodated in the cylinder of the secondary cylinder 43, while the external threaded portion of the external threaded member 71 is extended from one opening 43a of the secondary cylinder 43.

[0075] In the electric connection box 1, the external thread portion of the external thread component 71 is inserted into the through hole 22a to assemble the power connection portion 22 of the circuit branch component (circuit protection component) 21 to the power supply side electrical connection structure 70, and further, the external thread portion of the external thread component 71 is inserted into the through hole TBa to assemble the power supply side terminal fitting TB to the power supply side electrical connection structure 70. In addition, in the electric connection box 1, the internal thread component 73 is screwed into the external thread portion of the external thread component 71 to fasten and fix the power supply side terminal fitting TB, the second electrical connection portion 62 of the internal conductive component 60, and the power supply connection portion 22 of the circuit branch component (circuit protection component) 21 together. In the electric connection box 1, the power supply side terminal fitting TB and the circuit protection element 20 are assembled to the block 30 via the power supply side electrical connection structure 70.

[0076] One opening 43a of the secondary barrel 43 is covered by the first cover member 51 assembled to the frame 40 together with the power supply side terminal fitting TB, the second electrical connection portion 62 of the internal conductive member 60, the power supply connection portion 22 of the circuit branching member (circuit protection member) 21, and the power supply side electrical connection structure 70, and is accommodated in the first cover member 51. In addition, the first cover member 51 covers the recessed portion 42 of the frame 40, and the circuit branching element (circuit protection element) 20 in the recessed portion 42 is accommodated in the space between the first cover member 51 and the recessed portion 42.

[0077] The other opening 43b of the secondary cylinder portion 43 is closed by a closing portion 53 provided on a second cover member 52 assembled to the frame 40 so as not to be exposed to the outside of the frame 40 ( Figure 1 , Figure 3 , Figure 6 as well as Fig.13 ).

[0078] In the electric connection box 1, all the core wires of the power supply side wire WB, the first load side wire WL1, and the second load side wire WL2 may be formed of copper or a copper alloy. However, in order to achieve weight reduction, it is preferred that at least one of the core wires of the power supply side wire WB, the first load side wire WL1, and the second load side wire WL2 be formed of aluminum or an aluminum alloy. For example, the power supply side wire WB, the first load side wire WL1, and the second load side wire WL2 may be wires whose all core wires are formed of aluminum or an aluminum alloy, or wires whose at least one core wire is formed of aluminum or an aluminum alloy and the remaining core wires are formed of copper or a copper alloy.

[0079] When the core wires of the power supply side wire WB, the first load side wire WL1, and the second load side wire WL2 are formed of aluminum or aluminum alloy, it is possible to achieve weight reduction compared to the case where the core wires are formed of copper or copper alloy, but they become thick and hard to bend in response to large currents. However, in the electrical connection box 1, the circuit branching element (circuit protection element) 20 is arranged outside the barrel of the barrel 41 outside the frame 40, and the power supply side wire WB, the first load side wire WL1, etc., which are difficult to bend, are wired outside the frame 40. Therefore, the electrical connection box 1 can suppress the overload of the power supply side wire WB, etc. on the periphery in the frame, and can also improve the accommodation of other wires in the barrel of the barrel 41.

[0080] Specifically, the electric connection box 1 shown here includes a first internal conductive member 60A and a second internal conductive member 60B as the internal conductive member 60, and the first internal conductive member 60A and the second internal conductive member 60B are held by the block 30 ( Figure 4 and Figure 5 Here, as the internal conductive component 60, two types of first internal conductive components 60A are provided.

[0081] In addition, the circuit branching component (circuit protection component) 21 shown here includes a first power connection portion 22A and a second power connection portion 22B as the power connection portion 22, and the first power connection portion 22A and the second power connection portion 22B are electrically connected to the first power side wire WB1 and the second power side wire WB2 as the power side wire WB, respectively ( Figure 4 , Figure 7 and Fig.10 ). In the circuit branching component (circuit protection component) 21, the first power connection portion 22A and the second power connection portion 22B are connected by the connecting portion 25, and the fusible portion 24 is connected to the first power connection portion 22A and the second power connection portion 22B via the connecting portion 25. That is, the fusible portion 24 is interposed between the first power connection portion 22A and the load connection portion 23, and between the second power connection portion 22B and the load connection portion 23. Moreover, in the circuit protection component 21, since an additional electrical connection portion 25a is provided in the connecting portion 25, the additional electrical connection portion 25a is connected to the first power connection portion 22A and the second power connection portion 22B.

[0082] When viewed from the circuit branching component (circuit protection component) 21, the first power supply side wire WB1 is interposed between the first power supply connection portion 22A and the external power supply B, and electrically connects the first power supply connection portion 22A to the external power supply B. In addition, the second power supply side wire WB2 is electrically connected to an external electrical component P such as an AC generator and a DC-DC converter disposed outside the frame, and is electrically connected to the external power supply B via the circuit branching component (circuit protection component) 21 and the first power supply side wire WB1. That is, the second power supply side wire WB2 electrically connects the external electrical component P to the external power supply B via the circuit branching component (circuit protection component) 21 and the first power supply side wire WB1.

[0083] The first power connection portion 22A is electrically connected to the first power-side wire WB1, and is physically and electrically connected to the second electrical connection portion 62 of the first internal conductive component 60A. The electrical connection box 1 includes a first power-side electrical connection structure 70A as a power-side electrical connection structure 70 (electrical connection structure 70A) that electrically connects the first power-side wire WB1, the second electrical connection portion 62 of the first internal conductive component 60A, and the first power connection portion 22A of the circuit branch component (circuit protection component) 21. Figures 2 to 5 and Fig.11 ). In the first power supply side electrical connection structure 70A, the power supply side terminal fitting TB, the second electrical connection part 62 of the first internal conductive component 60A, and the first power supply connection part 22A of the circuit protection component 21 are fastened and fixed together by inserting the external thread part of the external thread part 71 through the through holes TBa, 62a, 22a of each of the power supply side terminal fitting TB at the end of the first power supply side wire WB1, the second electrical connection part 62 of the first internal conductive component 60A, and the first power supply connection part 22A of the circuit protection component 21, and screwing the internal thread part 73 with the external thread part. Here, the power supply side terminal fitting TB, the second electrical connection parts 62 of each of the two first internal conductive components 60A, and the first power supply connection part 22A of the circuit branch component (circuit protection component) 21 are fastened and fixed together.

[0084] The frame 40 shown here has a first sub-tube portion 43A as the sub-tube portion 43, and the first sub-tube portion 43A is provided with an opening (one opening 43a) opening in the same direction as the one opening 41a of the tube portion 41 ( Figures 1 to 4 , Figure 6 as well as Fig.12). The first sub-cylinder portion 43A accommodates the first power supply side electrical connection structure 70A in the cylinder, and makes the external thread portion of the external thread component 71 in the first power supply side electrical connection structure 70A protrude from an opening 43a. The first sub-cylinder portion 43A is set in the recess 42 of the frame 40. A first cutout 44A is provided on the cylinder wall 41c of the cylinder portion 41 as the cutout 44, and the first cutout 44A makes its own cylinder interior communicate with the cylinder interior of the first sub-cylinder portion 43A, and makes the second electrical connection portion 62 of the first internal conductive component 60A protrude outside the cylinder of the cylinder portion 41 to the outside of the frame 40 ( Figure 4 ). In addition, the block 30 is provided with a first protruding block portion 32A as a protruding block portion 32 for assembling the threaded retaining member 72 of the first power supply side electrical connection structure 70A. The first protruding block portion 32A protrudes from the first cutout 44A to the outside of the cylinder 41 and is received in the cylinder of the first sub-cylinder portion 43A ( Figure 4 and Figure 5 ).

[0085] In the electrical junction box 1, with the external thread portion of the external thread component 71 pulled out from an opening 43a of the first sub-cylinder portion 43A, the first protruding block portion 32A, the first power supply side electrical connection structure 70A and the second electrical connection portions 62 of each of the two first internal conductive components 60A are accommodated in the cylinder of the first sub-cylinder portion 43A.

[0086] The second power connection portion 22B is electrically connected to the second power supply side wire WB2, and is physically and electrically connected to the second electrical connection portion 62 of the second internal conductive component 60B. The electrical connection box 1 includes a second power supply side electrical connection structure 70B as a power supply side electrical connection structure 70 (electrical connection structure 70B) that electrically connects the second power supply side wire WB2, the second electrical connection portion 62 of the second internal conductive component 60B, and the second power supply connection portion 22B of the circuit branch component (circuit protection component) 21. Figures 2 to 5 The second power supply side electrical connection structure 70B is configured such that the external threaded portion of the external threaded component 71 is inserted through the through holes TBa, 62a, 22a of the power supply side terminal fitting TB at the end of the second power supply side wire WB2, the second electrical connection portion 62 of the second internal conductive component 60B, and the second power supply connection portion 22B of the circuit branch component (circuit protection component) 21, and the internal threaded component 73 is screwed into the external threaded portion, thereby fastening and fixing the power supply side terminal fitting TB, the second electrical connection portion 62 of the second internal conductive component 60B, and the second power supply connection portion 22B of the circuit branch component (circuit protection component) 21 together.

[0087] The frame 40 shown here has a second sub-tube portion 43B as the sub-tube portion 43, and the second sub-tube portion 43B is provided with an opening (one opening 43a) opening in the same direction as the one opening 41a of the tube portion 41 ( Figures 1 to 4 , Figure 6 as well as Fig.12 ). The second sub-cylinder portion 43B accommodates the second power supply side electrical connection structure 70B in the cylinder, and makes the external thread portion of the external thread component 71 in the second power supply side electrical connection structure 70B protrude from an opening 43a. The second sub-cylinder portion 43B is arranged in the recess 42 of the frame 40. A second cutout 44B is provided as the cutout 44 on the cylinder wall 41c of the cylinder portion 41, and the second cutout 44B makes the inside of the cylinder of the cylinder portion 41 communicate with the inside of the cylinder of the second sub-cylinder portion 43B, and makes the second electrical connection portion 62 of the second internal conductive component 60B protrude outside the cylinder of the cylinder portion 41 to the outside of the frame 40 ( Figure 4 ). In addition, a second protruding block portion 32B is provided in the block 30 as a protruding block portion 32 for assembling the threaded retaining member 72 of the second power supply side electrical connection structure 70B. The second protruding block portion 32B protrudes from the second notch 44B to the outside of the cylinder 41 and is accommodated in the cylinder of the second sub-cylinder portion 43B ( Figure 4 and Figure 5 ).

[0088] In the electrical junction box 1, the second protruding block portion 32B, the second power supply side electrical connection structure 70B and the second electrical connection portion 62 of the second internal conductive component 60B are accommodated in the tube of the second sub-cylinder portion 43B while the external thread portion of the external thread component 71 is extended from an opening 43a of the second sub-cylinder portion 43B.

[0089] In the electrical junction box 1, the external threaded portion of the external threaded component 71 of the first power supply side electrical connection structure 70A is inserted into the through hole 22a of the first power supply connection part 22A to assemble the first power supply side electrical connection structure 70A, and the external threaded portion of the external threaded component 71 of the second power supply side electrical connection structure 70B is inserted into the through hole 22a of the second power supply connection part 22B to assemble the second power supply side electrical connection structure 70B. Furthermore, in the electrical junction box 1, the external threaded portion of the external threaded component 71 of the first power side electrical connection structure 70A is inserted into the through hole TBa of the power side terminal accessory TB of the first power side wire WB1 to assemble the power side terminal accessory TB to the first power side electrical connection structure 70A, and the external threaded portion of the external threaded component 71 of the second power side electrical connection structure 70B is inserted into the through hole TBa of the power side terminal accessory TB of the second power side wire WB2 to assemble the power side terminal accessory TB to the second power side electrical connection structure 70B. In the electric connection box 1, the internal threaded parts 73 are screwed into the external threaded parts of the external threaded parts 71, respectively, to fasten and fix the power supply side terminal fittings TB of the first power supply side wire WB1, the second electrical connection parts 62 of the two first internal conductive parts 60A, and the first power supply connection part 22A of the circuit branching part (circuit protection part) 21 together, and the power supply side terminal fittings TB of the second power supply side wire WB2, the second electrical connection part 62 of the second internal conductive part 60B, and the second power supply connection part 22B of the circuit branching part (circuit protection part) 21 together. In the electric connection box 1, the two power supply side terminal fittings TB and the circuit branching element (circuit protection element) 20 are assembled to the block 30 via the first power supply side electrical connection structure 70A and the second power supply side electrical connection structure 70B.

[0090] An opening 43a of each of the first sub-barrel portion 43A and the second sub-barrel portion 43B, together with two power supply side terminal accessories TB, the second electrical connection portions 62 of each of the two first internal conductive components 60A and the second internal conductive components 60B, the first power supply connection portion 22A and the second power supply connection portion 22B of the circuit branch component (circuit protection component) 21, the first power supply side electrical connection structure 70A and the second power supply side electrical connection structure 70B, are covered by the first cover component 51 and are housed in the first cover component 51.

[0091] The second cover member 52 includes a first sealing portion 53A and a second sealing portion 53B as the sealing portion 53. The first sealing portion 53A seals the other opening 43b of the first sub-tube portion 43A so as not to be exposed to the outside of the frame 40, and the second sealing portion 53B seals the other opening 43b of the second sub-tube portion 43B so as not to be exposed to the outside of the frame 40. Figure 1 , Figure 3 , Figure 6 and Fig.13 ). The first closing portion 53A and the second closing portion 53B may be a plate-shaped wall portion that closes the other opening 43b together with the first cutout 44A and the second cutout 44B from the outside of the frame 40, or may be composed of a plurality of wall portions that surround and cover the other opening 43b together with the first cutout 44A and the second cutout 44B from the outside of the frame 40. Here, the first split cover 52A is assembled to the periphery of the other opening 41b of the barrel 41 provided with the first sub-barrel portion 43A and the second sub-barrel portion 43B. Therefore, the first closing portion 53A and the second closing portion 53B are provided on the first split cover 52A.

[0092] As described above, the electric connection box 1 of this embodiment arranges the circuit branching element (circuit protection element) 20 outside the frame 40 outside the tube of the tube portion 41, so that the power supply side wire WB (first power supply side wire WB1, second power supply side wire WB2), first load side wire WL1, and second load side wire WL2 connected to the circuit branching element (circuit protection element) 20 can be suppressed from overloading the surroundings in the frame. In particular, in the electric connection box 1, the larger the wire diameter, the more difficult it is for the power supply side wire WB (first power supply side wire WB1, second power supply side wire WB2), first load side wire WL1, and second load side wire WL2 to bend, so that the power supply side wire WB and the like can be suppressed from overloading the surroundings in the frame. For example, in the electric connection box 1, by suppressing the overload of the power supply side wire WB and the like on the second cover member 52 in the frame, the second cover member 52 can be suppressed from being deformed. In addition, the electrical connection box 1 can improve the accommodation of other electrical wires in the barrel of the barrel 41 by routing the power-side electrical wires WB and the like which are difficult to bend outside the frame 40. In addition, the electrical connection box 1 can suppress the temperature rise in the frame by routing the power-side electrical wires WB and the like outside the frame 40 so that the heat generated by the power-side electrical wires WB and the like does not remain in the frame. Moreover, the electrical connection box 1 has these effects and can make the first load-side electrical wires WL1 with the load-side terminal fittings TL be detached from the circuit branching element 20 at a visible location outside the frame 40, and can make the second load-side electrical wires WL2 with the load-side terminal fittings TL and the additional circuit protection element 29 be detached from the circuit protection element 20 at a visible location outside the frame 40. Therefore, the electrical connection box 1 of this embodiment can improve the detachment workability with respect to these circuit branching elements (circuit protection elements) 20.

[0093] Furthermore, the circuit branching element (circuit protection element) 20 of the present embodiment can be later installed with the additional circuit protection element 29, so when the additional external load L2 as the additional object is added, the additional circuit protection element 29 can be set between the additional external load L2 and the external power supply B. Therefore, the circuit branching element (circuit protection element) 20 can cope with the addition of the additional external load L2, and can cut off the overcurrent between the additional additional external load L2 and the external power supply B by the additional circuit protection element 29. In addition, the electrical connection box 1 of the present embodiment includes the circuit branching element (circuit protection element) 20 corresponding to the addition of the external load (additional external load L2), and can achieve the same effect obtained by the circuit branching element (circuit protection element) 20.

[0094] In addition, the electrical connection box 1 having the circuit branching element (circuit protection element) 20 capable of post-installation of the additional circuit protection element 29 has been described above as an example, but the electrical connection box 1 may also have a circuit branching element (circuit protection element) 120 (not compatible with post-installation of the additional circuit protection element 29) Fig.14 and Fig.15 ).

[0095] The circuit branching element (circuit protection element) 120 is equivalent to the circuit branching element (circuit protection element) 20 shown above, in which the circuit branching component (circuit protection element) 21 and the resin cover 27 are replaced with the following circuit branching element (circuit protection element) 121 and the resin cover 127. The circuit branching element (circuit protection element) 121 is the circuit branching component (circuit protection element) 21 shown above, in which the combination of the load connecting portion 23 and the fusible portion 24 is increased by one set to five sets in order to correspond to five external loads L1 ( Fig.15 ). In addition, the resin cover 127 is equivalent to the structure without the cutout portion 27a in the resin cover 27 shown above ( Fig.14 ).

[0096] In the electrical connection box 1, similarly to the previous example, the circuit branching element (circuit protection element) 120 is arranged in a state where the load connection portion 23 is exposed on the side opposite to the opposing wall body 41f side. Moreover, the circuit branching element (circuit protection element) 120 has five load-side electrical connection structures 75A. In the load-side electrical connection structure 75A, similarly to the previous example, the external threaded member 76 is arranged in a form in which the external threaded portion protrudes from the through hole 23a of the load connection portion 23 to the side opposite to the opposing wall body 41f side. Therefore, similarly to the previous example, the electrical connection box 1 can make the first load-side electric wire WL1 with the load-side terminal fitting TL be detachable from the circuit branching element (circuit protection element) 120 at a visible location outside the frame 40, thereby improving the detachability of the first load-side electric wire WL1 with the load-side terminal fitting TL from the circuit branching element (circuit protection element) 120.

[0097] Description of Reference Numerals

[0098] 1 Electrical junction box

[0099] 10 Electronic components

[0100] 20, 120 circuit branch components (circuit protection components)

[0101] 21, 121 circuit branch components (circuit protection components)

[0102] 22 Power connection

[0103] 22A First power connection

[0104] 22B Second power supply connection

[0105] 23 Load connection

[0106] 24 Fusible part

[0107] 25 Connection

[0108] 25a Additional electrical connection

[0109] 25b Through hole

[0110] 29 Add circuit protection components

[0111] 29a First terminal portion

[0112] 29b Second terminal portion

[0113] 40 Frames

[0114] 41 barrel

[0115] 41a an opening (opening)

[0116] 41c Cylinder wall

[0117] 41f Opposing wall

[0118] 51 first cover member (cover member)

[0119] 60 Internal conductive parts

[0120] 60A First internal conductive part

[0121] 60B Second internal conductive part

[0122] 61 first electrical connection portion

[0123] 62 second electrical connection portion

[0124] 75A load side electrical connection structure

[0125] 75B additional load side electrical connection structure

[0126] 76 External thread parts

[0127] 77 Internal thread parts

[0128] 78 Additional power supply side electrical connection structure

[0129] B External power supply

[0130] L1 External load

[0131] L2 Add external load

[0132] TB Power side terminal accessories

[0133] TL Load Side Terminal Accessories

[0134] WB Power supply side wire

[0135] WB1 First power supply side wire

[0136] WB2 Second power supply side wire

[0137] WL1 First load side wire

[0138] WL2 Second load side wire

Claims

1. An electrical junction box, characterized in that: have: Electronic components; an internal conductive component, the internal conductive component electrically connecting the electronic component to an external power source; A frame having a cylindrical portion, wherein the cylindrical portion is composed of a cylindrical wall having an opening at at least one end, and the electronic component and the internal conductive component are accommodated and held in the cylinder of the cylindrical portion; a cover member, the cover member closing the opening of the cylinder; as well as a circuit branching element, the circuit branching element is arranged outside the frame outside the tube of the tube portion and is disposed between the external power source and the external load, The internal conductive component has a first electrical connection portion and a second electrical connection portion, wherein the first electrical connection portion is physically and electrically connected to the electronic component within the barrel of the barrel portion, The tube wall of the tube portion has an opposing wall body arranged outside the tube to oppose the circuit branching element. The circuit branching element comprises: a conductive circuit branching component, the circuit branching component being provided between a power supply side wire electrically connected to the external power supply and a load side wire electrically connected to the external load; and a load side electrical connection structure, the load side electrical connection structure electrically connecting the load side wire and the circuit branching component outside the frame, The circuit branching component comprises: a power connection portion electrically connected to the power side electric wire and physically and electrically connected to the second electric connection portion of the internal conductive component; and a load connection portion physically and electrically connected to a load side terminal fitting at a terminal end of the load side electric wire, The circuit branching element is arranged in a state where the load connecting portion is exposed to the side opposite to the opposing wall body side, and The load-side electrical connection structure is a connection structure that physically and detachably connects the load-side terminal fitting of the load-side electric wire to the load connection portion of the circuit branching component on the side opposite to the opposing wall body side.

2. The electrical connection box according to claim 1, wherein: The load-side electrical connection structure is a common fastening and fixing structure that threadably fastens the load-side terminal fitting of the load-side electric wire and the load connection part of the circuit branching part through an external thread component and an internal thread component that is threadedly engaged with the external thread component, and the external thread component causes the external thread part to protrude from the through hole of the load connection part to the side opposite to the opposite wall side.

3. An electrical junction box, characterized in that: have: Electronic components; an internal conductive component, the internal conductive component electrically connecting the electronic component to an external power source; A frame having a cylindrical portion, wherein the cylindrical portion is composed of a cylindrical wall having an opening at at least one end, and the electronic component and the internal conductive component are accommodated and held in the cylinder of the cylindrical portion; a cover member, the cover member closing the opening of the cylinder; as well as A circuit protection element is arranged outside the frame outside the tube of the tube portion to cut off the overcurrent between the external power supply and the external load. The internal conductive component has a first electrical connection portion and a second electrical connection portion, wherein the first electrical connection portion is physically and electrically connected to the electronic component within the barrel of the barrel portion, The tube wall of the tube portion has an opposing wall body arranged outside the tube to oppose the circuit protection element. The circuit protection element comprises: a conductive circuit protection component, the circuit protection component being a component for cutting off an overcurrent between the external power supply and the external load between a power supply-side electric wire electrically connected to the external power supply and a first load-side electric wire electrically connected to the external load, wherein a first terminal portion of an additional circuit protection element for cutting off an overcurrent between the external power supply and an additional external load to be added can be electrically connected to the external power supply; an additional power supply side electrical connection structure, the additional power supply side electrical connection structure being capable of electrically connecting the first terminal portion of the additional circuit protection element to the circuit protection component outside the frame; as well as an additional load-side electrical connection structure capable of electrically connecting a second load-side electric wire electrically connected to the additional external load and a second terminal portion of the additional circuit protection element outside the frame, The circuit protection component comprises: a power connection portion, which is electrically connected to the power supply side wire and is physically and electrically connected to the second electrical connection portion of the internal conductive component; a load connection portion, which is electrically connected to the first load side wire; a fusible portion, which is arranged between the power connection portion and the load connection portion; an additional electrical connection portion, which is physically and electrically connected to the first terminal portion; and a connecting portion, which connects the additional electrical connection portion to the power connection portion. The circuit protection element is arranged in a state where the additional electrical connection portion is exposed on the side opposite to the opposing wall body side. The additional power supply side electrical connection structure is a connection structure that physically connects the first terminal portion of the additional circuit protection element to the additional electrical connection portion of the circuit protection component on the side opposite to the opposing wall body side, and The additional load-side electrical connection structure is a connection structure that detachably physically connects the load-side terminal fitting at the end of the second load-side electric wire and the second terminal portion of the additional circuit protection element on the side opposite to the opposing wall body side.

4. The electrical connection box according to claim 3, wherein: The additional power supply side electrical connection structure is a common fastening and fixing structure that uses an external thread component and an internal thread component that is threadedly engaged with the external thread component to thread the first terminal portion of the additional circuit protection element and the additional electrical connection portion, wherein the external thread component causes the external thread portion to protrude from the through hole of the additional electrical connection portion to the side opposite to the opposing wall body side, and The additional load-side electrical connection structure is a common fastening and fixing structure that uses an external thread component and an internal thread component that is threadedly engaged with the external thread component to threadably fasten the load-side terminal fitting at the end of the second load-side electric wire and the second terminal portion of the additional circuit protection element, and the external thread component causes the external thread portion to protrude to the side opposite to the opposing wall side.

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