JP2017028766A - Electric connection box and wiring harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling performance of an electronic component.SOLUTION: An electric connection box comprises a housing 10 having: a main body component 11 which is provided with a second housing chamber 22 for a second electronic component 102 acting as a heat generation source; a cover component 12 closing an opening 11a on one end of the main body component; and a wire lead-out part 41 for leading a wire 150 to the outside. The second housing chamber 22 has first and second walls 22a and 22b which face each other and also face two wide-area portions 102a of the second electronic component, respectively. The first wall 22a has an air inlet port 61 which is formed on one end side in the perpendicular direction to an insertion direction of the second electronic component so as to draw fresh air into the second housing chamber. The second wall 22b has an air outlet port 62 which is formed on the other end side in the perpendicular direction so as to discharge air inside the second housing chamber to the outside of the second housing chamber. The housing has: a fresh air introduction port 63 which is arranged closer to the air outlet port side than the air inlet port in the perpendicular direction so as to introduce the fresh air from the outside of the housing; and a fresh air passage 64 for guiding the fresh air from the fresh air introduction port to the air inlet port.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an electrical junction box and a wire harness.

  2. Description of the Related Art Conventionally, an electrical junction box is known in which an electronic component is accommodated in an internal space and an electric wire connected to the electronic component is drawn out to the outside. Furthermore, a wire harness having the electrical junction box is known. For example, the electrical junction box and the wire harness are mounted on the vehicle and are interposed between the power source and the load of the vehicle. Here, some electrical connection boxes contain electronic components that serve as heat sources such as an electronic control unit. Patent Documents 1 to 5 below disclose such an electrical junction box.

JP 9-32472 A JP 9-32174 A JP-A-11-354952 JP 11-354960 A JP 2002-368466 A JP-A-10-329624 JP 2003-298268 A

  By the way, in this kind of electrical junction box, the structure which bears cooling and heat dissipation of the electronic component is needed. For example, the electrical junction box of Patent Documents 1 to 5 includes an air layer provided between the outer wall portion forming the housing and the wall portion of the storage chamber of the electronic control unit, and an intake port communicated with the air layer. By providing an exhaust port on the outer wall, the electronic control unit is cooled and radiated. For this reason, this electrical junction box has room for improvement in cooling the electronic component which becomes a heat source. Patent Document 6 discloses a technique for providing a wind guide plate in such an air layer and adjusting the flow rate of cooling air in the air layer. Patent Document 7 discloses a cooling structure (fin shape) provided in a housing of an electronic control unit.

  Therefore, an object of the present invention is to provide an electrical junction box and a wire harness that can improve the cooling performance of the accommodated electronic components.

  In order to achieve the above object, the electrical junction box according to the present invention can be used as a main part in which a housing chamber for housing an electronic component serving as a heat source is formed, and an insertion port for the electronic component into the housing chamber. A housing part having a cover part that closes an opening at one end of the main part, and a wire lead-out part that draws out an electric wire electrically connected to the electronic part from the inside to the outside; The first and second wall portions are opposed to each other and are also opposed to two wide-area portions of the electronic component, and the first wall portion is inserted in the first wall portion in the insertion direction of the electronic component. The second wall portion is formed on the other end side of the second wall portion in the orthogonal direction. The second wall portion is formed on the other end side of the second wall portion. The air inside the storage chamber is exhausted to the outside of the storage chamber. A fresh air inlet that introduces fresh air from the outside of the housing; and the fresh air is disposed on the exhaust port side of the intake port in the orthogonal direction. And a fresh air flow path for guiding fresh air from the introduction port to the intake port.

  Here, it is desirable that the fresh air introduction port is disposed at a position equivalent to the exhaust port in the orthogonal direction.

  Moreover, it is desirable that the intake port is opposed to a heat radiating part in the wide area.

  In addition, the wire lead-out portion has an outlet through which the electric wire is drawn out of the casing, and extends along the periphery of the outlet and extends from the periphery in the direction of drawing out the wire. A plurality of tilting pieces that can be tilted toward the electric wire with a base on the edge side as a fulcrum, and the electric wire drawn out from the outlet has the tilting piece tilted so as to contact the electric wire It is desirable that a tape is wound around and fixed to the wire lead-out portion.

  The fresh air flow path includes a first fresh air flow path for guiding fresh air introduced from the fresh air introduction port to a height equivalent to that of the intake opening, and fresh air in the first fresh air flow path to the intake opening. A housing for opening the second fresh air flow channel to a vehicle lower side and the opening of the second fresh air flow channel from the vehicle lower side. A lid part, and the lid part has a frame projecting in a peripheral direction of the lid part in a direction in which the second fresh air channel is attached to the opening, and a side wall of the second fresh air channel The portion has a groove portion into which the frame body is inserted when the lid component is attached, and the groove portion faces the side wall surface of the frame body regardless of whether the lid component is lowered by its own weight. It is desirable to have a side wall surface.

  The fresh air flow path includes a first fresh air flow path for guiding fresh air introduced from the fresh air introduction port to a height equivalent to that of the intake opening, and fresh air in the first fresh air flow path to the intake opening. A second fresh air flow path that guides the first fresh air flow path to the vehicle lower side and a first opening that opens the second fresh air flow path to a vehicle lower side, and the first fresh air flow path side of the second fresh air flow path A second opening for opening the end of the first opening to the vehicle upper side, a first lid part for closing the first opening from the vehicle lower side, and a second lid part for closing the second opening from the vehicle upper side. The first lid component protrudes along a plurality of inner wall surfaces of the second fresh air flow path from a peripheral portion of the lid portion toward the first opening, and a lid portion closing the first opening. A plurality of the side walls, and the second opening is closed from the vehicle lower side, and an opening is formed of the protruding side ends of the plurality of the side walls. A box having a top plate portion that closes the inlet, and is disposed at a position equivalent to the inlet and the inlet for guiding the fresh air of the first fresh air flow path to the internal space of the box, and the box An outflow port for allowing fresh air in the internal space to flow out into the storage chamber, and from the respective end portions of the side wall portion and the top plate portion forming the inflow port in an intersecting direction and outward from the opening surface of the inflow port. Preferably, the housing has a U-shaped groove portion in which the flange portion is accommodated.

  In order to achieve the above object, the wire harness according to the present invention is a main part in which an electric wire, a storage chamber for storing an electronic component serving as a heat source is formed, and an insertion port for the electronic component into the storage chamber. A cover part that closes an opening at one end of the main part that can be used, and a housing that has an electric wire lead-out part that draws the electric wire electrically connected to the electronic part from the inside to the outside, The storage chamber has first and second wall portions that face each other and also face each of the two wide-area portions of the electronic component, and the first wall portion is formed on the first wall portion. An air inlet is formed on one end side in a direction orthogonal to the insertion direction of the electronic component and allows fresh air to flow into the storage chamber, and the second wall portion is in addition to the orthogonal direction of the second wall portion. Formed in the end side and empty inside the storage chamber And the housing is disposed closer to the exhaust port than the intake port in the orthogonal direction, and introduces fresh air from the outside of the housing. And a fresh air flow path for guiding fresh air from the fresh air inlet to the intake port.

  The electrical junction box according to the present invention and the wire harness provided with the electrical junction box are provided with an intake port at a position away from the exhaust port in a diagonal line in the electronic component storage chamber, and in a direction orthogonal to the insertion direction of the electronic component. In order to guide the fresh air from the fresh air introduction port arranged near the exhaust port to the intake port, a fresh air flow path is provided to connect the fresh air introduction port and the intake port. For this reason, in the electrical junction box and the wire harness of the present embodiment, the fresh air directly flows into the storage chamber, thereby circulating the fresh air that has flowed in the storage chamber, and the fresh air directly takes heat from the electronic components. Since the heat-received air can be discharged from the exhaust port, the cooling performance of the electronic component can be improved.

FIG. 1 is a perspective view illustrating an electrical junction box and a wire harness according to the embodiment. FIG. 2 is a perspective view showing a state where a cover part of the electrical junction box is removed. FIG. 3 is an exploded perspective view of the electrical junction box. FIG. 4 is a front view of the main part of the housing. FIG. 5 is a top view showing the main component in which the second electronic component is accommodated. FIG. 6 is a cross-sectional view of the main part taken along line X1-X1 in FIG. 4, and is a diagram illustrating an example of the flow of fresh air. FIG. 7 is a cross-sectional view of the main part taken along line X2-X2 in FIG. 4, and is a diagram illustrating an example of the flow of fresh air. FIG. 8 is a cross-sectional view of the main part taken along line X3-X3 in FIG. 4, and is a diagram illustrating an example of the flow of fresh air. FIG. 9 is a cross-sectional view of the main part taken along line YY in FIG. FIG. 10 is a rear view of the main component. FIG. 11 is a perspective view illustrating a state where the first lid part of the embodiment is removed from the housing. FIG. 12 is a bottom view of the main component. FIG. 13 is a bottom view of the housing. FIG. 14 is a diagram illustrating an airtight structure between the first lid component and the housing of the embodiment, and is a diagram partially showing a cross section taken along line X4-X4 of FIG. FIG. 15 is a diagram for explaining an airtight structure between the first lid part and the housing of the embodiment, and a cross section taken along line X4-X4 of FIG. 4 when the first lid part is lowered in the arrow direction. FIG. FIG. 16 is a perspective view showing a state in which the first electric wire outlet is removed from the main component. FIG. 17 is a perspective view at another angle showing a state in which the first electric wire outlet is removed from the main component. FIG. 18 is a perspective view of the first wire lead-out portion. FIG. 19 is a side view showing a state where a tape is wound around the first wire lead-out portion and the large-diameter wire. FIG. 20 is a side view showing a state in which a tape is wound around the first wire lead-out portion and the small-diameter wire. FIG. 21 is a perspective view showing a state in which the modified first lid part is removed from the housing. FIG. 22 is a perspective view of a modified first lid component. FIG. 23 is a perspective view of another angle of the first lid component according to a modification. FIG. 24 is a cross-sectional view of the main part cut at a position equivalent to the X1-X1 line of FIG. 4 and the first lid part of a modified example. FIG. 25 is an enlarged view of a portion A in FIG.

  Hereinafter, embodiments of an electrical junction box and a wire harness according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

[Embodiment]
One embodiment of an electrical junction box and a wire harness according to the present invention will be described with reference to FIGS.

  The code | symbol 1 of FIG.1 and FIG.2 shows the electrical junction box of this embodiment. Moreover, the code | symbol WH of FIG. 1 shows the wire harness provided with the electrical junction box 1. FIG.

  The electrical junction box 1 of the present embodiment includes various electronic components 100 that are electrically connected to a connection object such as a power source (not shown), a load (not shown), a sensor (not shown), and the like. It is what was contained. The electronic component 100 is, for example, a circuit protection component such as a relay or a fuse, a connector, or the like. Hereinafter, this type of electronic component 100 is referred to as a first electronic component 101. Moreover, in this embodiment, it is set as the electronic component 100 accommodated in the electrical-connection box 1 also about electronic devices, such as an electronic control unit (what is called ECU). Hereinafter, this type of electronic component 100 is referred to as a second electronic component 102. Corresponding electric wires (power supply lines, signal lines, etc.) 150 are electrically connected to the accommodated electronic component 100. In the electric junction box 1, the electric wire 150 is drawn out to the outside. The electrical junction box 1 forms a wire harness WH together with the electric wire 150 and the like. For example, the wire harness WH is disposed in a vehicle and is connected to a power source (secondary battery) side or an electric device (actuator or the like) side as a load via an electric wire 150.

  The electrical connection box 1 includes a housing 10 in which at least one electronic component 100 is accommodated and an electric wire 150 electrically connected to the electronic component 100 is drawn out. The housing 10 is formed of an insulating material such as synthetic resin, and has a space in which the electronic component 100 is accommodated. At least one storage chamber 20 for the electronic component 100 is formed in the internal space (FIGS. 2 and 3). The storage chamber 20 may be a space for storing a single electronic component 100 or a space for storing a combination of a plurality of electronic components 100 (hereinafter referred to as “electronic component group”). The electrical junction box 1 of this embodiment includes at least one storage chamber 20 that stores a single electronic component 100. That is, in the electrical junction box 1, as long as one accommodation chamber 20 that accommodates a single electronic component 100 is formed, the electrical connection box 1 accommodates each other single electronic component 100 accommodation chamber 20 or electronic component group. A chamber 20 may be provided. Specifically, the housing 10 of the present embodiment has, as its accommodation chamber 20, a first accommodation chamber 21 that accommodates an electronic component group together with an electronic component holder 30 described later, and a second accommodation that accommodates the electronic component 100 as a single item. One storage chamber 22 is provided.

  Here, the housing 10 of the present embodiment is formed by a plurality of components. For example, the illustrated case 10 is formed by assembling a main part 11 (FIGS. 1 to 5) and a cover part 12 (FIGS. 1 and 2). The main component 11 has an opening 11a at one end used as an insertion port for the electronic component 100 and a storage chamber 20 for storing the electronic component 100 inserted from the opening 11a. The cover part 12 closes the opening 11 a of the main part 11. The electrical junction box 1 of the present embodiment is mounted, for example, in an engine compartment (not shown), and is attached to the vehicle body with the opening 11a facing upward of the vehicle. In the following, vertical directions such as “upper”, “upper”, “lower”, “lower” and “bottom” are defined corresponding to the vertical direction of the vehicle.

  As described above, the housing 10 is provided with the two storage chambers 20 (the first storage chamber 21 and the second storage chamber 22).

  The first storage chamber 21 is a space in which an electronic component group is stored. This exemplary electronic component group is a combination of a plurality of first electronic components 101 of the same type or a plurality of types. The first electronic component 101 exemplified here is a connector that electrically connects two persons (for example, between a power source and a load) arranged outside the electrical junction box 1.

  The respective first electronic components 101 constituting the electronic component group are held by the electronic component holder 30 and are accommodated together in the first storage chamber 21 in an integrated state by the electronic component holder 30. The electronic component holder 30 is formed of an insulating material such as a synthetic resin, and has a space in which each first electronic component 101 is accommodated and held. The electronic component holder 30 may be referred to as a block. The electronic component holder 30 housed in the first housing chamber 21 is held in the first housing chamber 21 via a holding mechanism (not shown).

  The electronic component holder 30 has an opening on the side of the opening 11 a of the main component 11 inside the first housing chamber 21, and a part of each first electronic component 101 is exposed from this opening. One electric wire 150 electrically connected to the first electronic component 101 is led out from the exposed portion of the first electronic component 101. The one electric wire 150 is routed along the cover part 12 and drawn out from the first electric wire lead-out portion 41 of the housing 10 to the outside of the housing 10 (FIG. 1).

  Inside the electronic component holder 30, the other electric wire 150 electrically connected to the first electronic component 101 is guided to one place. The guided other electric wire 150 is drawn out of the housing 10 from the second electric wire lead-out portion 42 (FIG. 1). The second electric wire lead-out part 42 may be provided in the housing 10 or may be provided in the electronic component holder 30. In this example, the electronic component holder 30 is provided. For this reason, the second electric wire lead-out portion 42 is formed so as to be exposed to the outside of the housing 10 when the electronic component holder 30 is accommodated in the first accommodating chamber 21.

  The second storage chamber 22 is a space in which the second electronic component 102 is stored, and is disposed adjacent to the first storage chamber 21. The 2nd storage chamber 22 of this embodiment is illustrated as what accommodates the 2nd electronic component 102 used as heat sources, such as an electronic control unit. In the second electronic component 102, when it is accommodated in the second accommodating chamber 22, the electrically connected electric wire 150 is led out to the opening 11a side. The electric wire 150 is drawn out of the housing 10 from the third electric wire lead-out portion 43 of the housing 10 (FIG. 1).

The external appearance of the second electronic component 102 is formed in a substantially rectangular parallelepiped shape, and has four regions along the direction of insertion into the second storage chamber 22. The four regions are roughly divided into two wide area portions 102a that face each other and two narrow area portions 102b that are narrower than the wide area portion 102a and face each other (FIG. 3). A plurality of heat radiation portions (for example, heat radiation fins) 102a ₁ for releasing generated heat to the outside are formed in the wide area portion 102a. The second electronic component 102 is fixed to the two fixing portions 52A and 52B (FIG. 5) of the second storage chamber 22 with screws or the like via two holding members 51A and 51B (FIG. 3) such as brackets. The The second electronic component 102 is between the two wide area portions 102a and the inner wall surface of the second storage chamber 22, between the two narrow area portions 102b and the inner wall surface of the second storage chamber 22, and , And a space between the bottom and the bottom wall surface of the second storage chamber 22. When the air can enter and exit from the second storage chamber 22, the air can flow in the respective intervals.

  The second storage chamber 22 includes first and second wall portions 22 a and 22 b that face each other and face the two wide area portions 102 a of the second electronic component 102. As described above, a gap is provided between one wide area 102a and the first wall 22a and between the other wide area 102a and the second wall 22b.

  The first wall portion 22 a is a wall portion disposed on the inner side of the housing 10, and a part of the first wall portion 22 a is also used as an inner wall portion of the housing 10 in the first storage chamber 21. . The first wall portion 22a has an opening at a place excluding a portion shared with the first storage chamber 21, and the opening is used as an intake port 61 through which fresh air flows into the second storage chamber 22. (FIGS. 6-9). The air inlet 61 is formed on one end of the first wall portion 22a in the direction orthogonal to the insertion direction of the second electronic component 102 into the second storage chamber 22. The illustrated intake port 61 is a rectangular or trapezoidal opening that is orthogonal to the insertion direction and the orthogonal direction, and is disposed below the first storage chamber 21 (FIG. 7). In the following, unless otherwise specified, the insertion direction is simply referred to as “insertion direction”, and the orthogonal direction is simply referred to as “orthogonal direction”.

Here, it is desirable that the air inlet 61 be opposed to the heat dissipating part 102a1 on _one end side in the orthogonal direction of the second electronic component 102 on one end side of the first wall part 22a. Thus, fresh air flows into the second housing chamber 22, it means that the contact immediately to the heat radiating portion 102a _1, before the fresh air is heated by the ambient temperature of the second storage chamber 22, the heat radiating portion 102a ₁ The heat can be taken away efficiently.

  The 2nd wall part 22b has the exhaust port 62 which discharges the air inside the 2nd storage chamber 22 to the exterior of the said 2nd storage chamber 22 (FIG. 3, FIG. 5-FIG. 8 and FIG. 10). The exhaust port 62 is an opening that is orthogonal to the insertion direction and the orthogonal direction, and is formed on the other end side of the second wall portion 22b in the orthogonal direction. The illustrated exhaust port 62 is formed in a circular shape. Further, the exhaust port 62 is disposed on the vehicle upper side than the intake port 61 (FIG. 7). Here, the second wall portion 22 b is also used as an outer wall portion of the housing 10. For this reason, the exhaust port 62 discharges the air inside the second storage chamber 22 to the outside of the housing 10.

  In order to improve the cooling performance of the second electronic component 102, it is desirable to flow fresh air as low as possible into the second storage chamber 22. Here, the interior of the engine compartment in which the electrical junction box 1 is disposed is affected by the heat of the engine (not shown), and the ambient temperature increases toward the upper side of the vehicle. For this reason, the casing 10 of this embodiment is provided with a fresh air inlet 63 for introducing fresh air from the outside of the casing 10 on the vehicle lower side than the inlet 61 (FIGS. 7, 8, and 11). And FIG. 12), a flow path (hereinafter referred to as “new air flow path”) 64 for guiding fresh air from the fresh air introduction port 63 to the intake port 61 is provided (FIGS. 6 to 9, FIG. 11 and FIG. 12).

The fresh air introduction port 63 is arranged on the exhaust port 62 side of the intake port 61 in the orthogonal direction and on the vehicle lower side of the main component 11. The fresh air inlet 63 of the present embodiment is arranged at a position equivalent to the exhaust outlet 62 in the orthogonal direction (FIG. 12). The fresh air introduction port 63 is an opening at one end of a cylindrical body 63A integrally formed with the main component 11, and opens toward the vehicle lower side. The cylindrical body 63A has a flow path (hereinafter referred to as “first fresh air flow path”) 64a for guiding the fresh air introduced from the fresh air introduction port 63 to a height equivalent to that of the intake opening 61. Used. Thus, the cylindrical body 63A, the one end of the opening (fresh air inlet 63) is extended upward, is provided with an opening 63A ₂ at the other end to the same height as the inlet port 61. The opening 63A ₂ are those obtained by orthogonal both to the insertion direction and perpendicular direction, it is allowed to open to the equivalent direction and the inlet port 61 and exhaust port 62.

Here, in the first new air passage 64a, the flow direction of the fresh air introduced from the fresh air inlet 63 is switched at the opening 63A ₂ at the other end. Accordingly, in this first new air passage 64a, in order to smoothly flow the fresh air introduced from the fresh air inlet 63 into the opening 63A ₂ at the other end, inclined surfaces Ya in the flow direction of the switching portion of the fresh air A curved surface may be provided. In this illustration, it is provided an inclined surface 63A ₃ to the cylindrical body 63A (FIG. 7, etc.).

The first fresh air flow path 64 a of the cylinder 63 </ b> A forms a flow path on the fresh air introduction port 63 side in the fresh air flow path 64. The fresh air flow path 64 is a flow path for guiding the fresh air in the first fresh air flow path 64a to the intake opening 61 as the remaining flow path on the intake port 61 side (hereinafter referred to as “second fresh air flow path”). 64b. The 2nd fresh air flow path 64b is a flow path extended in the orthogonal direction. Therefore, in the second new air flow path 64b, it changes the flow direction of the fresh air flowing from the opening 63A ₂ at the other end. Therefore, an inclined surface or a curved surface may be provided at the switching portion of the flow direction of the fresh air in the second fresh air flow path 64b. In the second fresh air flow path 64b, the flow direction of fresh air also changes when it flows into the intake port 61. Therefore, an inclined surface or a curved surface may be provided at the switching portion of the flow direction of the fresh air in the second fresh air flow path 64b. In this example, a guide wall portion 64A for guiding the fresh air in the second fresh air flow path 64b to the intake port 61 is provided (FIG. 6 and the like). The guide wall 64A has a guide wall surface in which an inclined surface and a curved surface are connected, and guides fresh air from the inclined surface to the curved surface and guides it to the intake port 61. 64 A of this guide wall is connected with the outer wall part 11b of the housing | casing 10 (main part 11) in the inclined surface side, and the edge part of a curved surface side is the peripheral part (namely, 1st wall part 22a) of the inlet 61. It is connected to.

The second fresh air flow path 64b includes the outer wall portions 11b and 11c (FIGS. 4 and 6, etc.), the first wall portion 22a, the guide wall portion 64A, and the first storage chamber 21 of the housing 10 (main part 11). And a bottom wall portion 21a (FIGS. 6 and 7, etc.). In the 2nd fresh air flow path 64b, the outer wall parts 11b and 11c, the 1st wall part 22a, and the guide wall part 64A become a side wall part. The outer wall portion 11b is disposed so as to face the first wall portion 22a and is connected to the outer wall portion 11c that is orthogonal to the first wall portion 22a. The outer wall 11b has an opening into communication and communication is matched to the opening 63A ₂ at the other end. The outer wall portion 11c is suspended from the first wall portion 22a toward the outer wall portion 11b. In the housing 10 (main body part 11), by its respective side wall, an opening to open the second new air flow path 64b on the lower side of the vehicle (hereinafter, referred to as "first opening".) 64b ₁ is formed ( 7-9, 11 and 12). The first wall portion 22a, a lower than the second new air flow path 64b by causing offset to the second housing chamber 22 side (FIGS. 7 and 8), the lower end 22a along the first opening 64b _{1 1} is formed (FIGS. 11 and 12). In the first wall portion 22a, above the lower end 22a ₁ is used as a sidewall portion of the second new air flow path 64b. In other words, the lower end 22a ₁ becomes part of the lower end of the side wall portion of the second new air flow path 64b (first wall portion 22a). The first opening 64b ₁ is formed by a frame-shaped peripheral edge portion including the lower end of the side wall portion of the second fresh air flow path 64b (the lower end 22a ₁ and the outer wall portions 11b and 11c and the lower end of the guide wall portion 64A).

The housing 10 includes a lid part (hereinafter referred to as “first lid part”) 13 that closes the first opening 64b ₁ from the lower side of the vehicle (FIGS. 3, 11, and 13). The first lid component 13 is a member formed in a plate shape. The first lid component 13 is held in the housing 10 by a lock mechanism 53 provided between the first opening 64b _{1 and} the peripheral edge of the first opening 64b ₁ (FIG. 13). The locking mechanism 53 includes, for example, a claw portion provided on _one of the peripheral edge portion of the first lid part 13 and the peripheral edge portion of the first opening 64b ₁ and a locking portion that locks the claw portion. Configure.

Here, although depending on the size of the backlash of the claw portion and the locking portion in the lock mechanism 53, when the first lid component 13 is lowered by its own weight, the first lid component 13 and the first opening 64b ₁ There is a possibility that a gap is created between them, and outside air is introduced into the second fresh air flow path 64b from the gap. Since the gap exists above the vehicle from the fresh air inlet 63, the outside air introduced from the gap has a temperature higher than that of fresh air introduced from the fresh air inlet 63 to the second fresh air flow path 64b. May be higher. Therefore, the first cover part 13 is provided with a first frame 13a which projects toward the mounting direction of the opening 64b ₁ on its periphery (FIGS. 14 and 15). Then, the side wall portion of the lower end of the second new air flow path 64b in the (lower end 22a ₁ and the outer wall portion 11b, 11c and lower ends of the guide wall portions 64A), the first cover part when the first cover part 13 is attached A groove portion 64b ₁₁ into which 13 frame bodies 13a are inserted is provided. The groove portion 64b ₁₁ is formed by, for example, the side wall surface 64b ₁₂ facing the side wall surfaces 13a ₁ and 13a _{2 of the} frame 13a regardless of whether or not the first lid component 13 is lowered by its own weight as indicated by an arrow in FIG. 64b ₁₃ is formed. The setting is based on the time when the first lid part 13 is lowered most due to its own weight. In this illustration, the projecting side end of the frame 13a is formed at an acute angle, and the groove bottom side of the groove 64b ₁₁ {the portion (side facing the side wall surfaces 13a ₁ and 13a ₂ of the acute angle portion of the frame 13a) A so-called labyrinth structure in which the wall surfaces 64b ₁₂ , 64b ₁₃ )} are formed in an acute V shape is employed. Thus, in between the first cover part 13 and the first opening 64b _1, even when the first cover part 13 is most lowered by its own weight, by the respective side wall surfaces _{13a 1, 13a 2, 64b 12} , 64b 13 A long distance (so-called creepage distance) can be ensured before the outside air reaches the second fresh air flow path 64b from the outside of the housing 10. For this reason, in this electrical junction box 1, introduction of warm outside air from between the first lid component 13 and the first opening 64b ₁ can be suppressed, and a decrease in cooling performance of the second electronic component 102 is suppressed. be able to.

Further, in the housing 10 (main part 11), the second new air channel 64b also has a second new air passage on the upper side of the vehicle by the side wall portions (the outer wall portions 11b and 11c, the first wall portion 22a, and the guide wall portion 64A). An opening (hereinafter referred to as “upper opening”) 64b _{2 of the} air flow path 64b is formed (FIG. 7). A part of the upper opening 64 b ₂ is closed by the bottom wall portion 21 a of the first storage chamber 21. On the other hand, the remainder of the upper opening 64b ₂ are allowed to open the vehicle upper side as the second opening 64b ₃ (Fig. 6, 9 and 12). Its second opening 64b ₃ is a first end portion of the new air flow path 64a side in the second new air flow path 64b is opened to the vehicle upper side. The housing 10 includes a lid part (hereinafter referred to as “second lid part”) that closes the second opening 64b ₃ from above the vehicle. Second cover part may be provided as a dedicated article for closing the second opening 64b _3, but in the present embodiment, the second has the function of a lid component to the first wire draw-out portion 41. The 1st electric wire derivation | leading-out part 41 has the main body 41a (FIGS. 16-18). In the present embodiment, the lower end surface 41a ₁ of the principal 41a is utilized a second opening 64b ₃ as a lid portion for closing from above the vehicle side.

The 1st electric wire derivation | leading-out part 41 is demonstrated concretely. The main body 41a of the first electric wire lead-out portion 41 has an internal space, and the electric wire 150 is guided to the electronic component 100 in the storage chamber 20 through this internal space. The housing 10 (main component 11) includes a storage chamber 11d that stores the main body 41a from the opening 11a side. Its housing chamber 11d is formed in a rectangular shape according to the shape of the main 41a, and a second opening 64b ₃ in the bottom thereof.

Furthermore, the 1st electric wire derivation | leading-out part 41 has the cylinder 41b connected to the internal space of the main body 41a. The cylindrical body 41b is projected from the main body 41a toward the outside of the housing 10, and guides the electric wire 150 guided from the internal space of the main body 41a in the internal space. In the cylindrical body 41b, the ends of the protruding side is utilized an electric wire 150 as outlets 41b ₁ to draw to the outside of the housing 10. Accommodating chamber 11d, the cylindrical body 41b has a notch 11d ₁ as projecting out of the housing 10.

The first wire draw-out portion 41 has a fixing piece 41c which is extended from the periphery of the outlets 41b ₁ in the drawing direction of the wire 150. Further, the first wire draw-out portion 41, in a different position from the fixing piece 41c at the peripheral edge of the outlets 41b _1, is extended from and the peripheral edge spaced along their perimeter drawing direction of the wire 150, A plurality of tilting pieces (first and second tilting pieces 41d and 41e in this example) that can be tilted toward the electric wire 150 with the base on the peripheral side as a fulcrum are provided. The first tilting piece 41d is disposed at a position displaced about 45 degrees along the periphery of the outlets 41b ₁ relative to the fixed piece 41c. The second tilted piece 41e is disposed at a position shifted by about 45 degrees from the first tilted piece 41d (that is, a position facing the fixed piece 41c). The first and second tilting pieces 41d and 41e can be tilted using the roots as fulcrums by forming the roots in a thin hinge shape.

In the present embodiment, for example, the operator tilts the first and second tilting pieces 41d and 41e so that the tips thereof are in contact with the electric wire 150, and presses the electric wire 150 toward the fixed piece 41c. Then, the worker winds the electric wire 150 with the tape TP together with the fixed piece 41c and the first and second inclined pieces 41d and 41e (FIGS. 19 and 20). Thus, drawn out from the outlets 41b _1, fixed piece 41c and the first and second tilt piece 41d, wire 150 sandwiched between 41e is fixed piece 41c and the first and second tilt piece The tape TP is wound together with 41d and 41e and fixed to the first electric wire lead-out portion 41.

Here, the internal space of the main body 41 a communicates with the second storage chamber 22 inside the cover part 12. The outlets 41b ₁ is present in the vehicle above the fresh-air inlet 63. Therefore, when the gap is formed between the wire 150 and the lead-out port 41b ₁ is likely to hot ambient air from being introduced than fresh air through the gap.

However, for example, in the case the diameter of the wire 150 as shown in FIG. 19 is thick, since the gap between the wire 150 and the lead-out port 41b ₁ is small, ranging from outlets 41b ₁ side of the cylindrical body 41b to wires 150 By winding the tape TP as far as possible, the gap can be closed, and introduction of outside air from the gap can be suppressed. In addition, the diameter of the electric wire 150 here means the thickness when the electric wires 150 are bundled when, for example, a plurality of electric wires 150 are drawn, and the plural electric wires 150 are corrugated tubes. When the outer members are grouped together, it means the thickness of the outer member.

On the other hand, if the diameter of the wire 150 as shown in FIG. 20 is thin, the gap between the wire 150 and the lead-out port 41b ₁ is increased. For example, when the only gap is large and the fixing piece 41c above the outlets 41b ₁ second tilt piece 41e exist, even pressed against the wire 150 to the fixing piece 41c at its second tilting piece 41e, the Since a gap is also generated between the two inclined pieces 41e and the electric wire 150, it is difficult to wind the tape TP well so as to close the gap. However, in the electrical junction box 1 of the present embodiment, the electric wire 150 can be pressed against the fixed piece 41c with a plurality of inclined pieces (first and second inclined pieces 41d, 41e), and the fixed piece 41c and the plurality of fixed pieces 41c Since the inclined piece can be used as the adhesive surface of the tape TP, even if the gap between the electric wire 150 and the outlet 41b ₁ is large, the gap is closed with the wound tape TP and the outside air is introduced from the gap. Can be suppressed.

  Thus, in the electrical junction box 1 of the present embodiment, introduction of warm outside air from the first wire lead-out portion 41 can be suppressed, and a decrease in cooling performance of the second electronic component 102 can be suppressed.

By the way, the fresh air inlet 63 of the present embodiment has a cooling performance that introduces low temperature outside air (fresh air) in the engine compartment due to the layout in relation to the arrangement of other parts in the engine compartment. In view of the layout due to the above, the exhaust ports 62 are arranged in the orthogonal direction. In such a case, a configuration in which the fresh air introduced from the fresh air introduction port 63 is guided to the second storage chamber 22 without changing the position in the orthogonal direction and discharged from the exhaust port 62 can be considered. However, in this configuration, it is difficult to circulate the fresh air that has flowed into the second storage chamber 22 in the second storage chamber 22, and only a part of the second electronic component 102 may be cooled with fresh air. On the other hand, in the electrical junction box 1 of the present embodiment, the intake port 61 is provided at a position that is diagonally separated from the exhaust port 62, and the fresh air introduction port 63 disposed near the exhaust port 62 in the orthogonal direction. In order to guide the fresh air to the intake port 61, a fresh air flow path 64 connecting the fresh air introduction port 63 and the intake port 61 is provided. For this reason, in the electrical junction box 1 of the present embodiment, fresh air directly flows into the second storage chamber 22 to circulate the fresh air that flows in the second storage chamber 22, and the new air is supplied to the second electrons. It takes heat directly from the heat radiating portion 102a ₁ of the component 102, because the air after heat can be discharged from the exhaust port 62, thereby improving the cooling performance of the second electronic component 102.

Further, in this electrical junction box 1, a fresh air inlet 63 is disposed on the vehicle lower side than the housing 10, and fresh air having a low temperature among the outside air in the engine compartment can be sent to the second storage chamber 22. Therefore, the cooling performance of the second electronic component 102 can be further improved. Further, in the electric connection box 1, by a frame 13a and the groove 64b ₁₁ of the side wall portion of the second new air flow path 64b of the first cover part 13, even when the first cover part 13 is most lowered by its own weight, Since introduction of warm outside air from between the first lid part 13 and the first opening 64b ₁ can be suppressed, a decrease in cooling performance of the second electronic component 102 can be suppressed. Further, in the electrical junction box 1, the first wire lead-out portion 41 and the first wire lead-out portion 41 are connected to the first wire lead-out portion 41 by the fixed piece 41c provided on the first wire lead-out portion 41 and a plurality of tilting pieces (first and second tilting pieces 41d and 41e). Since the gap between the electric wire 150 drawn out from the one electric wire outlet 41 and the electric wire 150 can be closed with the tape TP, introduction of warm outside air into the second storage chamber 22 through the gap is suppressed, and the second electronic component A decrease in the cooling performance of 102 can be suppressed.

[Modification]
The electrical junction box 1 of the present modification is mainly obtained by replacing the first lid part 13 with the first lid part 14 in the configuration of the embodiment described above (FIGS. 21 to 23). In addition, the guide wall part 64A shown in the embodiment is not provided in the second fresh air flow path 64b of the present modification. For this reason, in this modification, the outer wall part 11e becomes a side wall part of the 2nd fresh air flow path 64b instead of the guide wall part 64A.

The first cover part 14 of this modification is a box body which is embedded in the second new air flow path 64b, the first opening 64b ₁ of the second new air flow path 64b with closing the lower side of the vehicle, the interior of the box The space is used as an alternative flow path 14a for the second fresh air flow path 64b. Specifically, the first lid component 14 includes a lid portion 14b, a plurality of side wall portions 14c, 14d, 14e, 14f, and a top plate portion 14g. The lid portion 14b and the side wall portions 14c, 14d, 14e and 14f and the top plate part 14g form a box. Strictly speaking, the box is formed in a state in which side walls 14i and 14k described later are further included.

The lid section 14b, a first opening 64b ₁ is a part for closing the lower side of the vehicle, a plate-like portion consisting of equivalent shape as the first cover part 13 of the embodiment. The plurality of side wall portions 14c, 14d, 14e, and 14f are directed from the peripheral edge of the lid portion 14b toward the second fresh air flow path 64b (first opening 64b ₁ ) and a plurality of inner wall surfaces of the second fresh air flow path 64b. It is the wall part protruded along. The respective side wall portions 14 c, 14 d, 14 e, 14 f extend to the vicinity of the bottom wall portion 21 a of the first storage chamber 21. The side wall part 14c is opposed to the inner wall surface of the side wall part (first wall part 22a) of the second fresh air flow path 64b. The side wall portion 14d faces the inner wall surface of the side wall portion (outer wall portion 11b) of the second fresh air flow path 64b. The side wall portion 14e faces the inner wall surface of the side wall portion (outer wall portion 11c) of the second fresh air flow path 64b. The side wall part 14f is opposed to the inner wall surface of the side wall part (outer wall part 11e) of the second fresh air flow path 64b. Top plate 14g is a second opening 64b ₃ together occlude the vehicle lower side, a portion for closing a plurality of side wall portions 14c, 14d, 14e, an opening consisting of an end portion of the protruding side of 14f. This top plate part 14g is arrange | positioned in the vicinity of the bottom wall part 21a of the 1st storage chamber 21, and is facing the inner wall surface by the side of the 2nd fresh air flow path 64b in the bottom wall part 21a.

The first lid component 14 includes an inlet 14h that guides fresh air from the first fresh air flow path 64a to the alternative flow path 14a (internal space of the box) (FIG. 23). During the inlet 14h is an opening which is arranged in a state of being open to the same direction at the same position and the opening 63A ₂ at the other end of the cylindrical body 63A, the side wall 14d and the side wall portion 14e which are orthogonal to each other Is intervening. In other words, the inlet 14h are those having the same function as the opening 63A ₂ of the other end. In the illustrated first lid component 14, a side wall portion 14i orthogonal to the side wall portion 14d is protruded from an end portion on the inflow port 14h side of the side wall portion 14d, and the side wall portion 14i, the side wall portion 14e, and the lid portion. A rectangular opening formed by the end portions of 14b and the top plate portion 14g is used as the inflow port 14h.

  Moreover, the 1st cover component 14 is equipped with the outflow port 14j which flows out the fresh air of the alternative flow path 14a (internal space of a box) to the 2nd storage chamber 22 (FIG. 22). The outlet 14j is an opening disposed in the same position at the same position as the intake port 61 and opened in the same direction, and is interposed between the side wall part 14c and the side wall part 14f orthogonal to each other. That is, the outflow port 14j has a function equivalent to that of the intake port 61. In the illustrated first lid component 14, a side wall portion 14k orthogonal to the side wall portion 14c protrudes from an end portion on the outlet 14j side of the side wall portion 14c, and the side wall portion 14k, the side wall portion 14f, and the lid portion. A rectangular opening formed by the end portions of 14b and the top plate portion 14g is used as the outlet 14j.

Here, in the electrical connection box 1 of the present modification, the lower end face 41a ₁ and the top plate portion 14g of the second opening 64b ₃ of the vehicle upper side of the second new air flow path 64b is mainly 41a of the first wire lead-out portion 41 Blocked by. However, in between the receiving chamber 11d and its principal 41a, can not be completely sealed to be prepared new parts such as sealing member, hence, sealing the second opening 64b ₃ in the lower end surface 41a ₁ Is difficult. Therefore, from the gap between the main 41a and the receiving chamber 11d, the outside air may flow into the second opening 64b _3. Furthermore, in this electrical junction box 1, it is difficult to completely seal the second opening 64b ₃ with the top plate portion 14g unless new parts such as a seal member are prepared. Accordingly, in this electric connection box 1, the outside air from the gap between the metallic 41a and the accommodating chamber 11d transmitted to the second opening 64b ₃ is, there is a possibility that is introduced into the alternative path 14a from the inflow port 14h . And the external air may be hotter than the fresh air which flows through the alternative flow path 14a.

Therefore, the first lid component 14 is formed by a pair of protrusions protruding outward from the respective end portions of the side wall portions 14d, 14e and the top plate portion 14g forming the inflow port 14h in the direction intersecting the opening surface of the inflow port 14h. A letter-shaped flange portion 14l is provided (FIGS. 23 to 25). The illustrated flange portion 141 protrudes on the same plane as the opening surface of the inflow port 14h. Further, the casing 10 (main component 11) is provided with a U-shaped groove portion 11f in which the flange portion 141 is accommodated. The groove portion 11f is formed, for example, in the outer wall portions 11b and 11c. The flange part 141 is inserted into the groove part 11f while the first lid part 14 is inserted into the second fresh air flow path 64b. It is desirable that the gap between the flange portion 14l and the groove portion 11f be small as long as the insertion operation of the first lid part 14 is not hindered. Thereby, in the electrical junction box 1 of this modification, even if warm outside air is transmitted to the second opening 64b ₃ from the gap between the main body 41a and the storage chamber 11d, the flange portion 14l and the groove portion 11f outside air can be secured long distance (so-called creepage distance) before reaching the inlet 14h from the second opening 64b _3. For this reason, in this electrical junction box 1, introduction of the warm outside air into the alternative flow path 14a can be suppressed, and a decrease in cooling performance of the second electronic component 102 can be suppressed.

DESCRIPTION OF SYMBOLS 1 Electrical junction box 10 Housing | casing 11 Main part 11a Opening 11b, 11c, 11e Outer wall part 11d Storage chamber 11f Groove part 12 Cover part 13 1st cover part (lid part)
13a Frame 13a ₁ , 13a ₂ Side wall surface 14 First lid part 14a Alternative flow path (internal space of box)
14b Lid portion 14c, 14d, 14e, 14f, 14i, 14k Side wall portion 14g Top plate portion 14h Inlet port 14j Outlet port 14l Flange portion 20 Accommodating chamber 21a Bottom wall portion 22 Second accommodating chamber 22a First wall portion 22b Second wall Part 41 First wire lead-out part (second lid part)
41a main body 41a ₁ lower end surface 41b ₁ outlet port 41c fixed piece 41d first tilting piece 41e second tilting piece 61 intake port 62 exhaust port 63 fresh air introduction port 64 fresh air channel 64a first fresh air channel 64b second fresh air channel 64b ₁₂ , 64b ₁₃ Side wall 64b ₁ 1st opening 64b ₃ 2nd opening 64b ₁₁ Groove part 100 Electronic component 102 2nd electronic component 102a Wide area part 102a ₁ Heat radiation part 150 Electric wire WH Wire harness

Claims (7)

A main part in which a housing chamber for housing an electronic component that becomes a heat source is formed, a cover part that closes an opening at one end of the main part that can be used as an insertion port for the electronic component into the housing chamber, and the electronic part A wire lead-out portion that draws out the electrically connected wires from the inside to the outside, and a housing having
The storage chamber has first and second wall portions that face each other and also face two wide-area portions of the electronic component,
The first wall portion is formed on one end side of the first wall portion in a direction orthogonal to the insertion direction of the electronic component, and has an intake port for allowing fresh air to flow into the storage chamber.
The second wall portion is formed on the other end side of the second wall portion in the orthogonal direction, and has an exhaust port for discharging the air inside the storage chamber to the outside of the storage chamber,
The casing is disposed on the exhaust port side of the inlet in the orthogonal direction, and introduces fresh air from the outside of the casing, and from the fresh air inlet to the inlet. An electrical junction box comprising: a fresh air flow path for guiding fresh air.   The electrical connection box according to claim 1, wherein the fresh air introduction port is disposed at a position equivalent to the exhaust port in the orthogonal direction.   The electrical junction box according to claim 1, wherein the air inlet is opposed to a heat radiating portion in the wide area. The wire lead-out portion is spaced from the outlet from which the electric wire is drawn out of the housing and along the periphery of the outlet and extends from the periphery in the direction of drawing out the wire, A plurality of tilting pieces capable of tilting toward the electric wire with the root as a fulcrum,
The said electric wire pulled out from the said outlet is taped with the tilting piece tilted so that it may contact | abut to the said electric wire, and is fixed to the said electric wire lead-out | leading-out part to Claim 1, 2, or 3 characterized by the above-mentioned. The electrical junction box described. The fresh air flow path guides fresh air introduced from the fresh air introduction port to a height equivalent to the intake port, and guides fresh air in the first fresh air flow channel to the intake port. A second fresh air flow path,
The housing includes an opening that opens the second fresh air flow path to the vehicle lower side, and a lid part that closes the opening of the second fresh air flow path from the vehicle lower side,
The lid part has a frame body that protrudes toward a direction of attachment to the opening of the second fresh air flow path at a peripheral portion thereof,
The side wall portion of the second fresh air flow path has a groove portion into which the frame body is inserted when the lid part is attached,
The groove portion has a side wall surface facing the side wall surface of the frame body regardless of whether or not the lid part is lowered by its own weight. The electrical junction box described. The fresh air flow path guides fresh air introduced from the fresh air introduction port to a height equivalent to the intake port, and guides fresh air in the first fresh air flow channel to the intake port. A second fresh air flow path,
The housing includes a first opening that opens the second fresh air flow path to the vehicle lower side, and a second opening that opens an end of the second fresh air flow path on the first fresh air flow path side to the vehicle upper side. A first lid part for closing the first opening from the lower side of the vehicle, and a second lid part for closing the second opening from the upper side of the vehicle,
The first lid component projects a lid that closes the first opening, a direction from the periphery of the lid to the first opening, and a plurality of inner wall surfaces of the second fresh air flow path. A plurality of side walls, and a top plate that closes the second openings from the vehicle lower side and closes the openings formed by the protruding end portions of the plurality of the side walls. An inlet that guides fresh air of the fresh air flow path to the internal space of the box, and an outlet that is disposed at a position equivalent to the intake port and allows the fresh air of the internal space of the box to flow out into the storage chamber; A U-shaped flange portion projecting outward from the respective end portions of the side wall portion and the top plate portion in the crossing direction with respect to the opening surface of the inflow port;
5. The electrical junction box according to claim 1, wherein the housing has a U-shaped groove portion in which the flange portion is accommodated. 6. Electric wires,
A main component in which a storage chamber for storing an electronic component serving as a heat source is formed, a cover component for closing an opening at one end of the main component that can be used as an insertion port for the electronic component into the storage chamber, and the electronic component A housing having a wire lead-out portion that draws the wire electrically connected to the outside from the inside,
With
The storage chamber has first and second wall portions that face each other and also face two wide-area portions of the electronic component,
The first wall portion is formed on one end side of the first wall portion in a direction orthogonal to the insertion direction of the electronic component, and has an intake port for allowing fresh air to flow into the storage chamber.
The second wall portion is formed on the other end side of the second wall portion in the orthogonal direction, and has an exhaust port for discharging the air inside the storage chamber to the outside of the storage chamber,
The casing is disposed on the exhaust port side of the inlet in the orthogonal direction, and introduces fresh air from the outside of the casing, and from the fresh air inlet to the inlet. A wire harness comprising a fresh air flow path for guiding fresh air.

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