CN116941152A - Electric connection box - Google Patents

Abstract

An electrical junction box for a vehicle, comprising a bus bar (11 a) having a through hole (114 a) at one end and screwed to a relay (10) using the through hole (114 a), wherein the electrical junction box comprises a heat absorbing member (12 a) attached to the one end and absorbing heat from the relay (10), and the heat absorbing member (12 a) comprises a through hole (122 a) corresponding to the through hole (114 a) and an engaging portion (121 a) engaged with the bus bar (11 a).

Description

Electric connection box

Technical Field

The present disclosure relates to an electrical junction box for a vehicle provided with a bus bar.

The present application claims priority based on japanese patent application No. 2021-038630 of application No. 2021, 3 and 10 and japanese patent application No. 2021-138136 of application No. 2021, 8 and 26, and the entire contents of the above japanese patent application are incorporated by reference.

Background

Conventionally, an electrical junction box having a circuit using a bus bar is mounted on a vehicle in order to conduct a relatively large current. In addition, in recent years, as the functions of the vehicle are expanded, the value of the current flowing through the bus bar is also gradually increased.

Patent document 1 discloses a power supply device including a relay and a bus bar connected to the relay, wherein heat dissipation fins are formed on the bus bar, or wherein the bus bar is bent to be in contact with a chassis, thereby dissipating heat generated in the relay.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication No. 2014-79093

Disclosure of Invention

An electrical junction box according to an aspect of the present disclosure is an electrical junction box for a vehicle including a bus bar having a through hole at one end and screwed to an electronic component using the through hole, wherein the electrical junction box includes a heat absorbing member attached to the one end and absorbing heat from the electronic component, and the heat absorbing member includes a corresponding through hole corresponding to the through hole and an engaging portion engaged with the bus bar.

Drawings

Fig. 1 is a perspective view showing an electrical connection box according to embodiment 1.

Fig. 2 is a perspective view showing a state in which an upper case is omitted in the electrical junction box according to embodiment 1.

Fig. 3 is a partial cross-sectional view taken along line III-III of fig. 2.

Fig. 4 is a cross-sectional view taken along line IV-IV of fig. 3.

Fig. 5 is a diagram showing a positional relationship between a bus bar and a heat sink in the electrical junction box according to embodiment 1.

Fig. 6 is a perspective view showing a positional relationship between a bus bar and a heat sink in the electrical junction box according to embodiment 1.

Fig. 7 is a view taken along line VII-VII of fig. 5.

Fig. 8 is a diagram showing a positional relationship between a bus bar and a heat sink in the electrical junction box according to embodiment 2.

Fig. 9 is a perspective view showing a positional relationship between a bus bar and a heat sink in the electrical junction box according to embodiment 2.

Fig. 10 is a view taken along line X-X of fig. 8.

Fig. 11 is a diagram showing a positional relationship between a bus bar and a heat sink in the electrical junction box according to embodiment 3.

Fig. 12 is a perspective view showing a positional relationship between a bus bar and a heat sink in the electrical junction box according to embodiment 3.

Fig. 13 is a diagram showing a positional relationship between a bus bar and a heat sink in the electrical junction box according to embodiment 4.

Fig. 14 is a view along arrow XIV of fig. 13.

Fig. 15 is a view showing a state after the position of the heat sink in fig. 14 is shifted.

Detailed Description

[ problem to be solved by the present disclosure ]

However, the electronic components of the electrical junction box include components that generate high heat during operation. The heat generated in the electronic component causes malfunction of the component, and may adversely affect surrounding electronic components, and therefore, suppression is required.

In contrast, in the power supply device of patent document 1, although heat generated by the electronic component (relay) is radiated via the bus bar, the bus bar has radiating fins or bent portions, and therefore the structure of the bus bar becomes complicated, and the effect of suppressing the heat rise in the electronic component is insufficient.

Accordingly, an object of the present application is to provide an electrical junction box capable of simply and effectively suppressing an increase in heat in an electronic component using a heat absorbing member, and improving workability of assembly.

[ Effect of the present disclosure ]

According to one aspect of the present disclosure, it is possible to provide an electrical junction box capable of simply and effectively suppressing heat rise in an electronic component using a heat absorbing member, and improving workability of assembly.

Description of embodiments of the application

First, embodiments of the present disclosure will be described. At least some of the embodiments described below may be arbitrarily combined.

(1) An electrical junction box according to an aspect of the present disclosure is an electrical junction box for a vehicle including a bus bar having a through hole at one end portion and screwed to an electronic component using the through hole, wherein the electrical junction box includes a heat absorbing member attached to the one end portion and absorbing heat from the electronic component, the heat absorbing member includes: a corresponding through hole corresponding to the through hole; and an engaging portion engaged with the bus bar.

In this aspect, when the engagement portion of the heat sink is engaged with the bus bar, the corresponding through hole is matched with the through hole of the bus bar, and therefore the heat sink and the bus bar can be screwed to the electronic component at the same time.

Therefore, the heat sink can quickly absorb heat from the electronic component, and workability in assembly can be improved.

(2) In the electrical junction box according to one aspect of the present disclosure, the bus bar has an engagement through hole that engages with the engagement portion.

In this aspect, the engaging portion of the heat absorbing member is inserted into and engaged with the engaging through hole of the bus bar. In this case, the corresponding through hole is matched with the through hole of the bus bar, and therefore the heat sink and the bus bar can be screwed to the electronic component at the same time.

Therefore, the heat sink can quickly absorb heat from the electronic component, and workability in assembly can be improved.

(3) In the electrical junction box according to one aspect of the present disclosure, the engagement portion is in a hook shape.

In this aspect, the engagement portion is formed in a hook shape, so that the engagement portion of the heat absorbing member can be engaged with the bus bar, and then the engaged state can be prevented from being unlocked.

Therefore, the workability of assembly can be further improved.

(4) In the electrical junction box according to one aspect of the present disclosure, a notch that engages with the engagement portion is formed at an edge of the bus bar.

In this aspect, the notch is formed at an edge of the bus bar, and the engaging portion of the heat absorbing member is engaged with the notch.

Therefore, the worker can easily engage the engagement portion with the notch, and workability in assembly can be further improved.

(5) In the electrical junction box according to one embodiment of the present disclosure, the heat absorbing member is made of copper or aluminum.

In this aspect, the heat absorbing member is made of a material having high thermal conductivity, such as copper or aluminum, so that heat can be rapidly absorbed from the electronic component.

Detailed description of embodiments of the application

The present application will be specifically described with reference to the drawings showing embodiments thereof. Hereinafter, an electrical junction box according to an embodiment of the present disclosure will be described with reference to the drawings. The present application is not limited to these examples, and is intended to be shown in the scope of the claims, and is intended to include all modifications within the meaning equivalent to the scope of the claims.

Hereinafter, the present embodiment will be described with reference to an electrical connection box housing a relay as an example of an electronic component.

(embodiment 1)

Fig. 1 is a perspective view showing an electrical connection box 100 according to embodiment 1. The electrical connection box 100 includes a housing case 50 that houses electronic components. The housing frame 50 is made of, for example, metal or resin, and houses a relay 10 described later.

Fig. 2 is a perspective view showing a state in which the upper case 51 is omitted in the electrical junction box 100 according to embodiment 1.

In the electrical junction box 100, the housing frame 50 is constituted by an upper case 51 to which the relay 10 is fixed and a lower case 52 covered by the upper case 51. The Electric connection box 100 is mounted on, for example, a battery pack of an EV (Electric Vehicle). The electrical junction box 100 is mounted so that the bottom plate 521 of the lower case 52 contacts the battery pack of the EV.

The relay 10 is fixed to a top plate 513 of the upper case 51 as will be described later. Bus bars 11a and 11b are provided near an inner side face 523 of a bottom plate 521 of the lower case 52 opposed to the top plate 513. A part of the bus bars 11a, 11b is interposed between the relay 10 and the inner side face 523. Hereinafter, for convenience, the bus bars 11a, 11b will also be referred to as bus bars 11.

Fig. 3 is a partial sectional view taken along line III-III of fig. 2, and fig. 4 is a sectional view taken along line IV-IV of fig. 3.

The relay 10 is switched to an on state when the vehicle is running, and is switched to an off state when the vehicle is not running, for example. The relay 10 has a rectangular parallelepiped box shape, and is provided such that one surface 102 of the relay 10 faces the bus bar 11 (inner surface 523).

In the relay 10, two connection pieces 106 are provided on the other surface 104 opposite to the one surface 102 (see fig. 2). The attachment tabs 106 are respectively attached to opposite edges of the other face 104. The 2 attachment pieces 106 are disposed diagonally to each other, extending from the edge of the other face 104 along the other face 104. The connecting piece 106 has a through hole 108 formed therethrough in the thickness direction of the connecting piece 106. Bolts (not shown) are inserted through the through holes 108, and are screwed into screw holes provided in the top plate 513 of the upper case 51, for example, to fix the relay 10 to the upper case 51.

The relay 10 has four side surfaces that stand up vertically from four edges of one surface 102 that is rectangular, and one of the side surfaces 107 is provided with the terminal 101 as described later. That is, the relay 10 is provided such that the one surface 102 faces the inner side surface 523 and the side surface 107 intersects the inner side surface 523.

The side surface 107 is rectangular in shape with the longitudinal direction being the opposite direction (hereinafter referred to as the longitudinal direction) of the top plate 513 and the bottom plate 521. Two terminals 101 are provided on the side surface 107. The two terminals 101 are arranged side by side in a direction intersecting the longitudinal direction (hereinafter, referred to as a lateral direction). The two terminals 101 are connected to the bus bars 11a and 11b, respectively. Only one terminal 101 is shown in fig. 3.

Each terminal 101 has a cylindrical shape, and is mostly embedded in the relay 10, and only one end is exposed from the side surface 107. Screw threads are formed on the inner peripheral surface of each terminal 101.

In addition, a partition plate 103 standing vertically from the side surface 107 is provided upright between the two terminals 101 on the side surface 107 of the relay 10. The two terminals 101 are separated by a separation plate 103. The partition plate 103 has a substantially elongated shape and extends in the longitudinal direction.

The bus bar 11 is made of, for example, a metal plate having good electrical conductivity. A bus bar 11a is connected to one terminal 101 of the two terminals 101 of the relay 10, and a bus bar 11b is connected to the other terminal 101.

The bus bar 11a has a flat portion 111a facing the one surface 102 of the relay 10 and the inner side face 523 of the bottom plate 521. Further, contact portions 112a and fixing portions 113a extending in the longitudinal direction are respectively provided in succession at opposite edges of the flat portion 111a.

The contact portion 112a is substantially rectangular in the longitudinal direction, and is disposed adjacent to the side surface 107 of the relay 10. The contact portion 112a extends along the side surface 107, and a through hole 114a is formed at a substantially central portion in the longitudinal direction. Further, a rectangular through hole 116a (engagement through hole) penetrating in the thickness direction is formed in the contact portion 112a at an end portion near the flat portion 111a.

The fixing portion 113a has an end portion bent parallel to the bottom plate 521, and a through hole 115a (see fig. 2) is formed in the end portion. The fixing portion 113a (bus bar 11 a) is fixed to the lower case 52 using the through hole 115 a.

The bus bar 11b has a flat portion 111b opposed to the inner side face 523 of the bottom plate 521. Further, contact portions 112b and fixing portions 113b extending in the longitudinal direction are respectively provided in succession at opposite edges of the flat portion 111b.

The contact portion 112b is substantially rectangular in the longitudinal direction, and is disposed adjacent to the side surface 107 of the relay 10. The contact portion 112b extends along the side surface 107, and a through hole (not shown) is formed in a substantially central portion in the longitudinal direction. Further, a rectangular through hole 116b (engagement through hole) penetrating in the thickness direction is formed in the contact portion 112b at an end portion near the flat portion 111b.

In the fixing portion 113b, an end portion is bent parallel to the bottom plate 521, and a through hole 115b (see fig. 2) is formed in the end portion. The fixing portion 113b (bus bar 11 b) is fixed to the lower case 52 using the through hole 115 b.

A pressing portion 13 that presses the bus bar 11 toward the bottom plate 521 is provided to protrude from the top plate 513 of the upper case 51. The pressing portion 13 extends longitudinally from the top plate 513, and presses the flat portion 111a of the bus bar 11a and the flat portion 111b of the bus bar 11b toward the bottom plate 521.

For example, the pressing portion 13 is integrally formed with the upper case 51, and when the assembly of the electrical junction box 100 is completed, the tip end of the pressing portion 13 always contacts the flat portions 111a, 111b, and presses the bus bars 11a, 11b toward the bottom plate 521.

However, in the relay 10, a large amount of heat is generated in operation. This heat may not only cause malfunction of the component, but also adversely affect the electrical components around the relay 10, and therefore, it is necessary to suppress the heat.

In the electrical junction box 100 according to embodiment 1, heat generated by the relay 10 is absorbed by using other members that increase so-called thermal mass (thermal mass is stored by taking heat away) or heat capacity, thereby dispersing the heat. Therefore, the heat rise in the relay 10 can be suppressed simply and effectively. As another component, as shown in fig. 4, heat absorbing members 12a and 12b are attached to the connection portion between the relay 10 and the bus bar 11 in the electrical junction box 100. That is, the heat sink 12a is attached to the bus bar 11a, and the heat sink 12b is attached to the bus bar 11b. The following detailed description is given based on the drawings.

Fig. 5 is a diagram showing a positional relationship between the bus bar 11a and the heat absorbing member 12a in the electrical junction box 100 according to embodiment 1, fig. 6 is a perspective view showing a positional relationship between the bus bar 11a and the heat absorbing member 12a, and fig. 7 is a view taken along line VII-VII in fig. 5. In fig. 5 to 7, only the bus bar 11a and the heat absorbing member 12a are shown for convenience.

As described above, the contact portion 112a of the bus bar 11a is disposed adjacent to the side surface 107 of the relay 10, and faces the side surface 107. The heat sink 12a is attached to the other surface of the contact portion 112a.

The heat sink 12a may be made of a metal plate material such as Al or Cu, for example, or may be made of the same material as the bus bar 11a. The heat sink 12a has a rectangular plate 123a extending in the longitudinal direction. The rectangular plate 123a has a longitudinal dimension shorter than the contact portion 112a and a transverse dimension longer than the contact portion 112a. The rectangular plate 123a has a through hole 122a (corresponding through hole) penetrating in the thickness direction at a substantially central portion in the longitudinal direction.

In the heat absorbing member 12a, an engaging portion 121a that engages with the contact portion 112a is provided in a continuous manner at a substantially central portion of one of the two short sides of the rectangular plate 123a on the flat portion 111a side. The engaging portion 121a has an L-shape in a longitudinal section. That is, the engaging portion 121a has a long shape, and the tip portion is bent toward the contact portion 112a. The front end of the engaging portion 121a engages with the rectangular through hole 116a of the contact portion 112a.

That is, the front end portion of the engaging portion 121a is rectangular in cross section, and the rectangular through hole 116a of the contact portion 112a has a shape that mimics the front end portion of the engaging portion 121a. As shown in fig. 5 to 7, the front end portion of the engaging portion 121a is inserted into the rectangular through hole 116a, and the engaging portion 121a (heat sink 12 a) engages with the contact portion 112a.

Thereby, the position of the heat sink 12a with respect to the contact portion 112a is determined. That is, when the engagement portion 121a is engaged with the contact portion 112a (rectangular through hole 116 a), the other short side of the rectangular plate 123a is aligned with the short side of the contact portion 112a, and the position of the through hole 122a of the rectangular plate 123a matches the position of the through hole 114a of the contact portion 112a (see fig. 5).

In this way, the heat sink 12a and the contact portion 112a (bus bar 11 a) are screwed to the relay 10 by the bolts 105 in a state where the through holes 122a of the rectangular plate 123a are matched with the through holes 114a of the contact portion 112a (see fig. 3 and 4).

That is, the bolt 105 is inserted into the through hole 122a and the through hole 114a and screwed into the terminal 101, whereby the heat sink 12a and the contact portion 112a (bus bar 11 a) are fixed to the terminal 101. The bus bar 11a is electrically connected to the terminal 101 of the relay 10, and the heat sink 12a is pressure-bonded to the bus bar 11a.

Further, the heat sink 12b is attached to one surface of the contact portion 112b of the bus bar 11b opposite to the side surface 107, and the heat sink 12b has a rectangular plate 123b and an engaging portion 121b. As shown in fig. 4, the tip end of the engaging portion 121b is inserted into the rectangular through hole 116b of the contact portion 112b, and the engaging portion 121b (heat sink 12 b) engages with the contact portion 112 b. At this time, the through hole (not shown) of the rectangular plate 123b is matched with the through hole (not shown) of the contact portion 112b, and the bolt 105 is inserted through the through hole of the rectangular plate 123b and the through hole of the contact portion 112b to be screwed with the terminal 101, thereby screw-fixing the heat sink 12b and the contact portion 112b (bus bar 11 b) to the relay 10 (see fig. 4).

Since the heat absorbing members 12a, 12b are formed in substantially the same shape as each other, the positional relationship between the bus bar 11a and the heat absorbing member 12a is the same as the positional relationship between the bus bar 11b and the heat absorbing member 12b, and therefore, a detailed description about the heat absorbing member 12b is omitted.

As described above, in the electrical junction box 100 according to embodiment 1, the heat sink 12a is attached to the bus bar 11a and the heat sink 12b is attached to the bus bar 11b at the connection portion between the relay 10 and the bus bar 11.

Therefore, the heat generated by the relay 10 at the time of energization is quickly transferred to the heat absorbing members 12a, 12b via the contact portions 112a, 112b and absorbed. The heat absorbing members 12a and 12b can store a considerable amount of heat of the relay 10, and can disperse the heat of the relay 10 to suppress excessive temperature rise of the relay 10 and the contact portions 112a and 112 b. The heat absorbed by the heat absorbing members 12a, 12b is cooled by air via the surfaces of the heat absorbing members 12a, 12b.

In assembling the electrical junction box 100 according to embodiment 1, the worker inserts and engages the engagement portions 121a and 121b of the heat absorbing members 12a and 12b into the rectangular through holes 116a and 116b of the contact portions 112a and 112b, respectively, matches the through hole 122a of the rectangular plate 123a with the through hole 114a of the contact portion 112a, and matches the through hole of the rectangular plate 123b with the through hole of the contact portion 112 b. In such a matched state, the worker inserts the bolt 105 into the through hole 122a of the rectangular plate 123a and the through hole 114a of the contact portion 112a to be screwed with the corresponding terminal 101, and inserts the bolt 105 into the through hole of the rectangular plate 123b and the through hole of the contact portion 112b to be screwed with the corresponding terminal 101.

At this time, since the engagement portions 121a and 121b engage with the rectangular through holes 116a and 116b, when the worker rotates the bolt 105, the heat absorbing members 12a and 12b can be prevented from rotating together and the heat absorbing members 12a and 12b can be prevented from being displaced due to the rotation, and workability can be improved.

Further, by engaging the engaging portions 121a, 121b of the heat absorbing members 12a, 12b with the rectangular through holes 116a, 116b of the contact portions 112a, 112b, the through hole 122a of the rectangular plate 123a and the through hole 114a of the contact portion 112a are matched, and the through hole of the rectangular plate 123b and the through hole of the contact portion 112b are matched, so that the tolerance is reduced and the design is easy.

As described above, the heat of the relay 10 absorbed by the heat absorbing members 12a, 12b is cooled by the air via the surfaces of the heat absorbing members 12a, 12b. Therefore, irregularities may be formed on the surfaces of the heat absorbing members 12a, 12b which do not contact the contact portions 112a, 112 b. In this case, the area of the heat absorbing members 12a and 12b in contact with the air becomes larger, and therefore, the air cooling of the heat accumulated in the heat absorbing members 12a and 12b can be performed more efficiently.

In the above, the relay 10 is described as an example of an electronic component that generates heat during operation, but the present application is not limited thereto. For example, the present application can be applied to other electronic components such as a semiconductor switch.

(embodiment 2)

Fig. 8 is a diagram showing a positional relationship between the bus bar 11a and the heat absorbing member 12a in the electrical junction box 100 according to embodiment 2, fig. 9 is a perspective view showing a positional relationship between the bus bar 11a and the heat absorbing member 12a, and fig. 10 is a view taken along the line X-X in fig. 8. In fig. 8 to 10, only the bus bar 11a and the heat absorbing member 12a are shown for convenience.

The electrical junction box 100 according to embodiment 2 includes bus bars 11a and 11b and heat absorbing members 12a and 12b as in embodiment 1. Since the heat absorbing members 12a and 12b are formed in substantially the same shape as each other, the positional relationship between the bus bar 11a and the heat absorbing member 12a is the same as the positional relationship between the bus bar 11b and the heat absorbing member 12b, and therefore, the bus bar 11a and the heat absorbing member 12a will be described below with reference to fig. 8 to 10, and the description of the bus bar 11b and the heat absorbing member 12b will be omitted.

In the electrical junction box 100 according to embodiment 2, an engagement hole 117a (engagement through hole) for engaging with the heat absorbing member 12a is formed in the bus bar 11a. The engagement hole 117a is formed from the flat portion 111a to the contact portion 112a. That is, the flat portion 111a and the contact portion 112a are cut in a substantially rectangular shape at the widthwise center from the end of the flat portion 111a near the contact portion 112a to the end of the contact portion 112a near the flat portion 111a, and the engagement hole 117a is formed. In addition, as in embodiment 1, a heat sink 12a is attached to the other surface of the contact portion 112a of the bus bar 11a.

The heat sink 12a has a rectangular plate 123a extending in the longitudinal direction. The rectangular plate 123a has a longitudinal dimension shorter than the contact portion 112a and a transverse dimension longer than the contact portion 112a. The rectangular plate 123a has a through hole 122a penetrating in the thickness direction at a substantially central portion in the longitudinal direction.

Further, in the heat absorbing member 12a, an engaging portion 124a that engages with the contact portion 112a is provided in the substantially central portion of one of the two short sides of the rectangular plate 123a on the flat portion 111a side. The engagement portion 124a has a long shape, and an end portion thereof is bent toward the contact portion 112a side to have a hook shape (see fig. 10). The end of the engaging portion 124a engages with the engaging hole 117a of the bus bar 11a.

That is, the dimension of the end of the engaging portion 124a in the width direction of the engaging portion 124a is smaller than the dimension of the engaging hole 117a in the width direction of the contact portion 112a, and as shown in fig. 8 to 10, the end of the engaging portion 124a is inserted into the engaging hole 117a, and the engaging portion 124a (heat sink 12 a) engages with the contact portion 112a. As described above, the end of the engaging portion 124a is hooked, and therefore the tip of the engaging portion 124a is hooked on one surface side of the contact portion 112a.

In this way, when the engagement portion 124a engages with the contact portion 112a (engagement hole 117 a), as shown in fig. 8, the position of the through hole 122a of the rectangular plate 123a matches the position of the through hole 114a of the contact portion 112a. In addition, the heat sink 12a is restricted from moving in a direction away from the contact portion 112a.

In this way, in a state where the through hole 122a of the rectangular plate 123a is matched with the through hole 114a of the contact portion 112a, the bolt 105 is inserted into the through hole 122a and the through hole 114a and screwed into the terminal 101, whereby the heat sink 12a and the contact portion 112a (bus bar 11 a) are fixed to the terminal 101 (see fig. 4). The bus bar 11a is electrically connected to the terminal 101 of the relay 10, and the heat sink 12a is pressure-bonded to the bus bar 11a.

Therefore, in the electrical junction box 100 according to embodiment 2, heat generated by the relay 10 at the time of energization is quickly absorbed by the heat sink 12a via the contact portion 112a. The heat sink 12a can disperse the heat of the relay 10 and suppress an excessive rise in the temperature of the relay 10 and the contact portion 112a.

In addition, in assembling the electrical junction box 100 according to embodiment 2, the worker engages the engagement portion 124a with the contact portion 112a (the engagement hole 117 a) to match the through hole 122a of the rectangular plate 123a with the through hole 114a of the contact portion 112a. In this state, the worker inserts the bolt 105 into the through hole 122a of the rectangular plate 123a and the through hole 114a of the contact portion 112a, and screws the bolt into the corresponding terminal 101.

At this time, since the engagement portion 124a engages with the engagement hole 117a, when the worker rotates the bolt 105, the heat absorbing member 12a can be prevented from rotating together and the heat absorbing member 12a can be prevented from being displaced due to the rotation, and workability can be improved.

In the electrical junction box 100 according to embodiment 2, since the end of the engagement portion 124a is hooked as described above, the engagement portion 124a engages with the engagement hole 117a, and is thus hooked to the contact portion 112a, thereby restricting the heat sink 12a from moving in a direction away from the contact portion 112a. Therefore, workability can be further improved.

In the electrical junction box 100 according to embodiment 2, the engagement hole 117a for engaging with the heat sink 12a (the engagement portion 124 a) is formed wider from the flat portion 111a to the contact portion 112a. Therefore, when the worker engages the engagement portion 124a with the engagement hole 117a, the insertion operation of the engagement portion 124a into the engagement hole 117a is facilitated. Therefore, workability can be further improved.

While the bus bar 11a and the heat sink 12a have been described above as examples, the bus bar 11b and the heat sink 12b have the same structure, and the same effects can be obtained.

The same reference numerals are given to the same parts as those of embodiment 1, and detailed description thereof is omitted.

Embodiment 3

Fig. 11 is a diagram showing a positional relationship between the bus bar 11a and the heat sink 12a in the electrical junction box 100 according to embodiment 3, and fig. 12 is a perspective view showing a positional relationship between the bus bar 11a and the heat sink 12a. In fig. 11 to 12, only the bus bar 11a and the heat sink 12a are shown for convenience.

The electrical junction box 100 according to embodiment 3 includes bus bars 11a and 11b and heat absorbing members 12a and 12b as in embodiment 1. Since the heat absorbing members 12a and 12b are formed in substantially the same shape as each other, the positional relationship between the bus bar 11a and the heat absorbing member 12a is the same as the positional relationship between the bus bar 11b and the heat absorbing member 12b, and therefore, the bus bar 11a and the heat absorbing member 12a will be described below as an example based on fig. 11 to 12, and the description of the bus bar 11b and the heat absorbing member 12b will be omitted.

In the electrical junction box 100 according to embodiment 3, a cutout 118a that engages with the heat absorbing member 12a is formed in the bus bar 11a. The cutout 118a is formed near the end of the flat portion 111a at the edge portion of one long side of the contact portion 112a. The cutout 118a is rectangular and extends perpendicularly from the edge of the contact portion 112a.

In addition, as in embodiment 1, a heat sink 12a is attached to the other surface of the contact portion 112a of the bus bar 11a.

The heat sink 12a has a rectangular plate 123a extending in the longitudinal direction. The rectangular plate 123a has a longitudinal dimension shorter than the contact portion 112a and a transverse dimension longer than the contact portion 112a. The rectangular plate 123a has a through hole 122a penetrating in the thickness direction at a substantially central portion in the longitudinal direction.

Further, in the heat absorbing member 12a, an engaging portion 125a that engages with the contact portion 112a is provided at one end portion of one of the two short sides of the rectangular plate 123a on the flat portion 111a side. The engaging portion 125a has an L-shape in a longitudinal section. That is, the engaging portion 125a has a rectangular shape, and the tip portion is bent toward the contact portion 112a side to engage with the notch 118a of the contact portion 112a.

That is, the front end portion of the engaging portion 125a is rectangular in cross section, and the cutout 118a of the contact portion 112a has a shape that mimics the front end portion of the engaging portion 125a. As shown in fig. 11 to 12, the tip end portion of the engaging portion 125a is inserted into the cutout 118a, and the engaging portion 125a (heat sink 12 a) engages with the contact portion 112a.

In this way, when the engaging portion 125a is engaged with the contact portion 112a (the cutout 118 a), as shown in fig. 11, the position of the through hole 122a of the rectangular plate 123a matches the position of the through hole 114a of the contact portion 112a.

In this way, in a state where the through hole 122a of the rectangular plate 123a is matched with the through hole 114a of the contact portion 112a, the bolt 105 is inserted into the through hole 122a and the through hole 114a and screwed with the corresponding terminal 101, whereby the heat sink 12a and the contact portion 112a (bus bar 11 a) are fixed to the terminal 101 (see fig. 4). The bus bar 11a is electrically connected to the terminal 101 of the relay 10, and the heat sink 12a is pressure-bonded to the bus bar 11a.

Therefore, in the electrical junction box 100 according to embodiment 3, heat generated by the relay 10 at the time of energization is quickly absorbed by the heat sink 12a via the contact portion 112a, and an excessive increase in temperature of the relay 10 and the contact portion 112a can be suppressed.

In addition, in assembling the electrical junction box 100 according to embodiment 3, the worker engages the engagement portion 125a with the contact portion 112a (the cutout 118 a) to match the through hole 122a of the rectangular plate 123a with the through hole 114a of the contact portion 112a. In this state, the worker inserts the bolt 105 into the through hole 122a of the rectangular plate 123a and the through hole 114a of the contact portion 112a, and screws the bolt into the corresponding terminal 101.

At this time, since the engagement portion 125a engages with the cutout 118a, when the worker rotates the bolt 105, the heat absorbing member 12a can be prevented from rotating together and the heat absorbing member 12a can be prevented from being displaced due to the rotation, and workability can be improved.

In the electrical junction box 100 according to embodiment 3, the notch 118a that engages with the heat sink 12a (the engaging portion 125 a) is formed at the end of the long side edge portion of the contact portion 112a. Thus, the notch 118a is easily formed. When the worker engages the engagement portion 125a with the notch 118a, the worker may insert the engagement portion 125a from the side surface side of the contact portion 112a to the notch 118a, thereby facilitating the work. Therefore, workability can be further improved.

While the bus bar 11a and the heat sink 12a have been described above as examples, the bus bar 11b and the heat sink 12b have the same structure, and the same effects can be obtained.

The same reference numerals are given to the same parts as those of embodiment 1, and detailed description thereof is omitted.

Embodiment 4

Fig. 13 is a diagram showing a positional relationship between the bus bar 11a and the heat sink 12a in the electrical junction box 100 according to embodiment 4, fig. 14 is a view taken along arrow XIV in fig. 13, and fig. 15 is a diagram showing a state after the position of the heat sink 12a in fig. 14 is shifted. In fig. 13 to 15, only a part of the relay 10, the bus bar 11a, the heat absorbing member 12a, and the bottom plate 521 is shown for convenience, and in fig. 14 to 15, the bolts 105 are omitted for convenience.

The electrical junction box 100 according to embodiment 4 includes bus bars 11a and 11b and heat absorbing members 12a and 12b as in embodiment 1. The bus bars 11a and 11b are formed in substantially the same shape as each other, and the heat absorbing members 12a and 12b are also formed in substantially the same shape as each other, and the positional relationship between the bus bar 11a and the heat absorbing member 12a is the same as the positional relationship between the bus bar 11b and the heat absorbing member 12b. Therefore, the bus bar 11a and the heat sink 12a will be described below with reference to fig. 13 to 15, and the description of the bus bar 11b and the heat sink 12b will be omitted.

In embodiment 4, the bus bar 11a is provided closer to the top plate 513 (not shown) than the relay 10. The bus bar 11a has a flat portion 111a, a contact portion 112a, and a fixing portion 113a (not shown) as in embodiment 1, and the flat portion 111a is interposed between the other surface 104 of the relay 10 and the top plate 513, and faces the other surface 104. The contact portion 112a and the fixing portion 113a are provided so as to be connected to both ends of the flat portion 111a, and extend toward the bottom plate 521.

The contact portion 112a is substantially rectangular in the longitudinal direction, is adjacent to the side surface 107 of the relay 10, and faces the side surface 107. The contact portion 112a has a through hole 114a formed in a substantially central portion in the longitudinal direction (see fig. 14). In the contact portion 112a, two engaging recesses 119a (see fig. 15) that engage with engaging strips 524 of the bottom plate 521 described later are formed near the edge portion of the bottom plate 521. Each engagement recess 119a is rectangular, and two engagement recesses 119a are formed at a predetermined interval.

In addition, as in embodiment 1, a heat sink 12a is attached to the other surface of the contact portion 112a of the bus bar 11a.

The heat sink 12a has a rectangular plate 123a. The rectangular plate 123a has a longitudinal dimension shorter than the contact portion 112a and a transverse dimension longer than the contact portion 112a. The rectangular plate 123a has a through hole 122a (see fig. 14) penetrating in the thickness direction at a substantially central portion in the longitudinal direction. In the rectangular plate 123a, two engaging recesses 126a (see fig. 14 and 15) that engage with the engaging strips 524 of the bottom plate 521 are formed near the edge of the bottom plate 521. Each engagement recess 126a is rectangular, and two engagement recesses 126a are formed at a predetermined interval. In the opposite direction of the heat sink 12a and the contact 112a, the position of the engaging recess 126a of the heat sink 12a corresponds to the position of the engaging recess 119a of the contact 112a.

In embodiment 4, two engaging strips 524 that engage with the engaging concave portions 126a of the heat absorbing member 12a and the engaging concave portions 119a of the contact portion 112a are provided on the inner side face 523 of the bottom plate 521. Each engagement bar 524 is formed at a position corresponding to the engagement recess 126a of the heat sink 12a and the engagement recess 119a of the contact portion 112a in the longitudinal direction, and extends in the opposite direction of the heat sink 12a and the contact portion 112a. Each engagement bar 524 is substantially elongated in cross section, and has a chamfer at the distal end. The engagement bar 524 is integrally formed with the bottom plate 521.

When each engagement strip 524 engages with the engagement recess 126a of the heat sink 12a and the engagement recess 119a of the contact 112a, the position of the through hole 122a of the rectangular plate 123a matches the position of the through hole 114a of the contact 112a, as shown in fig. 14.

In this way, in a state where the through hole 122a of the rectangular plate 123a is matched with the through hole 114a of the contact portion 112a, the bolt 105 is inserted into the through hole 122a and the through hole 114a and screwed with the terminal 101 of the relay 10, whereby the heat sink 12a and the contact portion 112a (bus bar 11 a) are fixed to the terminal 101 (see fig. 13). The bus bar 11a is electrically connected to the terminal 101 of the relay 10, and the heat sink 12a is pressure-bonded to the bus bar 11a.

Therefore, in the electrical junction box 100 according to embodiment 4, heat generated by the relay 10 at the time of energization is quickly absorbed by the heat sink 12a via the contact portion 112a, and an excessive increase in temperature of the relay 10 and the contact portion 112a can be suppressed.

In addition, in assembling the electrical junction box 100 according to embodiment 4, the worker can mate the through-hole 122a of the rectangular plate 123a and the through-hole 114a of the contact portion 112a by merely engaging each engagement strip 524 with the engagement recess 126a of the heat sink 12a and the engagement recess 119a of the contact portion 112a. Therefore, the bolt 105 can be easily inserted into the through hole 122a of the rectangular plate 123a and the through hole 114a of the contact portion 112a and screwed with the terminal 101, and workability can be improved.

While the bus bar 11a and the heat sink 12a have been described above as examples, the bus bar 11b and the heat sink 12b have the same structure, and the same effects can be obtained.

The same reference numerals are given to the same parts as those of embodiment 1, and detailed description thereof is omitted.

The embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. The scope of the present application is not defined above, but is defined by the scope of the claims, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

Description of the reference numerals

10 relay (electronic component)

11. 11a, 11b bus bar

12a, 12b heat sink

13. Pressing part

50. Housing frame

51. Upper shell

52. Lower shell

100. Electric connection box

101. Terminal for connecting a plurality of terminals

102. One side is provided with

103. Partition plate

105. Bolt

107. Side surface

111a, 111b flat part

112a, 112b contact portions

114a through hole

116a, 116b rectangular through hole (engagement through hole)

117a engagement hole (engagement through hole)

118a incision

119a engaging concave portion

121a, 121b engaging portion

122a through hole (corresponding through hole)

123a, 123b rectangular plate

124a engagement portion

125a engaging part

126a engaging concave portion

513. Top plate

521. Bottom plate

523. Inner side surface

524. Clamping strip

Claims (5)

1. An electric junction box for a vehicle, the electric junction box comprising a bus bar having a through hole at one end portion and screwed to an electronic component using the through hole, wherein,

the electric connection box is provided with a heat absorbing component which is arranged at the one end part and absorbs heat from the electronic component,

the heat absorbing member has:

a corresponding through hole corresponding to the through hole; a kind of electronic device with high-pressure air-conditioning system

And an engagement portion engaged with the bus bar.

2. The electrical junction box of claim 1, wherein,

the bus bar has an engagement through hole engaged with the engagement portion.

3. The electrical junction box according to claim 1 or 2, wherein,

the clamping part is in a hook shape.

4. The electrical junction box of claim 1, wherein,

a notch is formed at the edge of the bus bar to engage with the engagement portion.

5. The electrical junction box according to any one of claims 1 to 4, wherein,

the heat sink is composed of copper or aluminum.