阅读说明：本技术 汇流条的散热结构 (Heat radiation structure of bus bar ) 是由 酒井秀彰 岩田邦弘 小林宪 于 2020-01-31 设计创作，主要内容包括：汇流条的散热结构具备：汇流条；包覆构件,通过树脂材料形成,将汇流条包覆；以及框体,通过金属材料形成。包覆构件具有与框体接触的接触部,将汇流条嵌入而与汇流条一体成形。(The heat dissipation structure of a bus bar is provided with: a bus bar; a covering member formed of a resin material to cover the bus bar; and a frame body formed of a metal material. The cover member has a contact portion that contacts the frame body, and is integrally formed with the bus bar by fitting the bus bar.)

1. A heat dissipation structure for a bus bar is provided with:

a bus bar;

a covering member that is formed by a resin material and covers the bus bar; and

a frame body formed by a metal material,

the cover member has a contact portion that contacts the frame body, and is integrally formed with the bus bar by inserting the bus bar.

2. The heat dissipation structure of a bus bar according to claim 1,

the covering member has a thickness at the contact portion larger than a thickness of a peripheral portion of the contact portion.

3. The heat dissipation structure of a bus bar according to claim 2,

the thickness of the cover member is larger as it approaches the contact portion.

4. The heat dissipation structure of a bus bar according to any one of claims 1 to 3,

the contact portion has a projection projecting toward the frame,

the frame body has a fitting recess into which the projection is fitted.

5. The heat dissipation structure of a bus bar according to any one of claims 1 to 4,

the sheathing member has: a main body portion that covers the bus bar; and an elastic portion formed of a resin material softer than the main body portion and provided between the main body portion and the frame.

6. The heat dissipation structure of a bus bar according to any one of claims 1 to 5,

the bus bar is one of a plurality of bus bars,

the sheathing member is integrally formed with the plurality of bus bars.

7. The heat dissipation structure of a bus bar according to claim 6,

the contact portion is disposed between the bus bars adjacent to each other.

Technical Field

The present disclosure relates to a heat dissipation structure of a bus bar.

Background

Patent document 1 discloses an electrical junction box including a bus bar and a housing, the bus bar being fixed to the housing. In the electrical connection box described in patent document 1, the bus bar is fixed to a case made of a heat conductive material. Therefore, the heat of the bus bar is released to the outside of the case via the contact portion of the bus bar and the case.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-25673

Disclosure of Invention

Problems to be solved by the invention

However, in the electrical connection box described in patent document 1, the bus bar and the housing are formed separately and assembled to each other. Therefore, there is a possibility that a gap may be generated between the bus bar and the housing due to a manufacturing error such as an assembly error. As a result, the contact area between the bus bar and the case is reduced, and heat transfer from the bus bar to the case and thus heat dissipation of the bus bar may be impaired.

An object of the present disclosure is to provide a heat dissipation structure of a bus bar capable of improving heat dissipation of the bus bar.

Means for solving the problems

The heat dissipation structure of the bus bar for achieving the above object includes: a bus bar; a covering member that is formed by a resin material and covers the bus bar; and a frame body formed of a metal material, the cover member having a contact portion contacting the frame body and being integrally formed with the bus bar by fitting the bus bar.

Drawings

Fig. 1 is a perspective view illustrating a heat dissipation structure of a bus bar in embodiment 1.

Fig. 2(a) is a perspective view showing the bus bar in embodiment 1 from the front side, and fig. 2(b) is a perspective view showing the bus bar in embodiment 1 from the back side.

Fig. 3(a) is a sectional view taken along line 3a-3a of fig. 1, and fig. 3(b) is a sectional view taken along line 3b-3b of fig. 1.

Fig. 4 is a cross-sectional view taken along line 4-4 of fig. 1.

Fig. 5 is a perspective view showing the bus bar in embodiment 2 from the surface side.

Fig. 6(a) is a sectional view taken along line 6a-6a of fig. 5, and fig. 6(b) is a sectional view taken along line 6b-6b of fig. 5.

Detailed Description

Hereinafter, embodiment 1 of the heat dissipation structure of the bus bar will be described with reference to fig. 1 to 4.

As shown in fig. 1, 2(a) and 2(b), the bus bar 10 is formed of a metal plate material such as copper or aluminum, and has an elongated plate shape. A connection portion 11 electrically connected to another member is bent at one end of the bus bar 10.

As shown in fig. 1, the bus bar 10 is assembled to a frame 30 made of a metal material such as aluminum. In fig. 1, only a part of the housing 30 is shown.

Hereinafter, the longitudinal direction of the bus bar 10 will be described as the longitudinal direction L, the width direction of the bus bar 10 will be described as the width direction W, and the thickness direction of the bus bar 10 will be described as the thickness direction T.

A covering member 20 covering the entire outer circumferential surface of the bus bar 10 is provided at the center of the bus bar 10 in the longitudinal direction L. The covering member 20 of the present embodiment includes a main body 21 and an elastic portion 28.

The main body 21 is formed of a hard synthetic resin material, extends in the longitudinal direction L, and covers the bus bar 10. As the resin material constituting the body portion 21, PA6 (polyamide 6) resin, PA66 (polyamide 66) resin, PPS (polyphenylene sulfide) resin, and PBT (polybutylene terephthalate) resin, which are excellent in thermal conductivity, are preferable.

Two attachment portions 22 protruding in opposite directions to each other in the width direction W are provided at both ends of the body portion 21 in the longitudinal direction L.

As shown in fig. 2a and 2 b, a plurality of (eight in total) weight reduction portions 24 are provided at both ends of the body portion 21 in the longitudinal direction L. Each weight-reduced portion 24 is trapezoidal in plan view, and exposes a part of both surfaces of the bus bar 10 in the thickness direction T.

A plurality of (eight in total) weight reducing portions 25 are provided on the inside of the weight reducing portion 24 in the longitudinal direction L of the main body portion 21. Each weight-reducing portion 25 is formed in a right triangle shape in plan view, and exposes a part of both surfaces of the bus bar 10 in the thickness direction T.

As shown in fig. 2(a), 2(b) and 3(a), a cylindrical collar 23 formed of a metal material such as aluminum is fixed to each mounting portion 22.

As shown in fig. 3(a), the fitting portion 22 is formed with a hole 22a penetrating the fitting portion 22 in the thickness direction T. The collar 23 is fixed to the inside of the hole 22 a.

As shown in fig. 2(b), 3(b), and 4, a cylindrical projection 27 projecting toward the housing 30 is provided on the rear surface of the body 21, i.e., on the surface facing the housing 30.

As shown in fig. 3(b) and 4, an annular recess 21a is provided on the outer periphery of the projection 27 in the body 21. A disk-shaped elastic portion 28 is provided in the recess 21a, and the elastic portion 28 is formed of a resin material softer than the main body portion 21 and has a center hole. The elastic portion 28 is flush with the back surface of the main body 21. As a resin material constituting the elastic portion 28, an elastic body excellent in heat resistance such as silicone resin is preferable.

The main body 21 is integrally molded with the bus bar 10 and the collar 23 by fitting the bus bar 10 and the collar 23 into a molding die and injecting a molten resin into a cavity (not shown) in the molding die. At this time, the weight-reduced portions 24 and 25 are formed by a clip (not shown) that sandwiches both surfaces of the bus bar 10 in the thickness direction T.

The main body 21 integrally molded with the bus bar 10 and the collar 23 is fitted into a molding die, and a molten resin is injected into a cavity (not shown) in the molding die, whereby the elastic portion 28 is integrally molded with the main body 21.

As shown in fig. 3(b) and 4, the 2 nd support portion 32 protrudes from the frame 30. The projection 27 is fitted into a fitting recess 33 opened in the top surface of the 2 nd support portion 32. Thereby, the bus bar 10 is positioned to the frame 30.

As shown in fig. 3(a), the bolt 35 is inserted through the collar 23 of the mounting portion 22. The 1 st support portion 31 protrudes from the frame 30. The bolt 35 is screwed into a female screw hole 31a opened in the top surface of the 1 st support part 31. Thereby, as shown in fig. 1, the bus bar 10 is fixed to the frame 30. The elastic portion 28 is sandwiched between the end surfaces of the body portion 21 and the 2 nd support portion 32.

In the present embodiment, the protrusion 27 and the elastic portion 28 of the main body 21 constitute the contact portion 26 that contacts the frame 30.

As shown in fig. 3(b) and 4, the surface of the main body portion 21 of the cover member 20 is inclined such that the distance to the bus bar 10 increases as the distance from the contact portion 26 increases in both the longitudinal direction L and the width direction W. Thus, the thickness of the covering member 20 increases as it approaches the contact portion 26 in both the longitudinal direction L and the width direction W. That is, the thickness of the sheathing member 20 in the contact portion 26 is greater than the thickness of the surrounding portion of the contact portion 26.

Next, the operation and effects of the present embodiment will be described.

(1) The heat dissipation structure of the bus bar 10 includes: a bus bar 10; a covering member 20 that is formed by a resin material and covers the bus bar 10; and a frame 30 formed of a metal material. The cover member 20 has a contact portion 26 that contacts the frame 30, and is integrally molded with the bus bar 10 by fitting the bus bar 10.

According to such a structure, the cover member 20 formed of a resin material is integrally formed with the bus bar 10 by fitting the bus bar 10, and therefore, there is almost no gap between the bus bar 10 and the cover member 20. Therefore, the heat of the bus bar 10 is easily directly transmitted to the sheathing member 20. The heat thus transmitted is transmitted to the frame 30 through the contact portion 26 of the sheathing member 20. Therefore, the heat dissipation property of the bus bar 10 can be improved.

(2) The thickness of the sheathing member 20 at the contact portion 26 is greater than the thickness of the surrounding portion of the contact portion 26. In addition, the thickness of the cover member 20 increases as it approaches the contact portion 26.

According to such a structure, heat transmitted from the bus bar 10 to the cover member 20 moves from the peripheral portion of the contact portion 26 toward the contact portion 26, and the contact portion 26 can accumulate a large amount of heat due to a relatively large thickness. This allows a large amount of heat to be released to the housing 30 through the contact portion 26.

(3) The contact portion 26 has a projection 27 projecting toward the frame 30. The frame 30 has a fitting recess 33 into which the projection 27 is fitted.

According to such a configuration, the protrusion 27 provided in the contact portion 26 is fitted in the fitting recess 33 of the housing 30, whereby the cover member 20 and the bus bar 10 can be positioned with respect to the housing 30.

Further, by adding the protrusion 27 and the fitting recess 33, the contact area between the contact portion 26 and the frame 30 is increased, and therefore, the heat dissipation performance of the bus bar 10 can be further improved.

(4) The covering member 20 has: a main body 21 that covers the bus bar 10; and an elastic portion 28 formed of a resin material softer than the main body portion 21 and provided between the main body portion 21 and the frame 30.

With such a configuration, the bus bar 10 and the cover member 20 can be assembled to the housing 30 in a state where the elastic portion 28 interposed between the cover member 20 and the housing 30 is elastically deformed. This can suppress the occurrence of a gap between the covering member 20 and the frame 30. Therefore, the heat of the covering member 20 can be efficiently transmitted to the frame 30.

< embodiment 2 >

Hereinafter, referring to fig. 5 and 6, embodiment 2 will be described mainly focusing on the differences between embodiment 2 and embodiment 1.

As shown in fig. 5, in the present embodiment, a pair of bus bars 10 are arranged in parallel. Specifically, the pair of bus bars 10 are arranged to face each other in the thickness direction T.

As shown in fig. 5, 6(a) and 6(b), the covering member 40 is integrally formed with the pair of bus bars 10.

The covering member 40 has a rectangular tubular frame portion 41 and a plate portion 42 provided inside the frame portion 41. The pair of long side portions of the frame 41 covers the entire outer peripheral surfaces of the pair of bus bars 10. The plate portion 42 is located at the center of the frame portion 41 in the width direction W, and is connected to the entire inner surface of the frame portion 41.

As shown in fig. 6(a) and 6(b), a contact portion 46 is provided at the center of the rear surface of the plate portion 42, and the contact portion 46 contacts the top surface of a support portion 51 protruding from the housing 50. That is, the contact portion 46 is provided between the bus bars 10 adjacent to each other. In addition, the frame 50 is formed of a metal material such as aluminum, as in the case of the frame 30 of embodiment 1.

A cylindrical projection 43 is provided to protrude from a portion of the surface of the plate portion 42 corresponding to the contact portion 46. That is, the thickness of the sheathing member 40 at the contact portion 46 is greater than the thickness of the surrounding portion of the contact portion 46.

As shown in fig. 5, a pair of ribs 44 is provided on the surface of the plate portion 42, and the pair of ribs 44 extend along a pair of diagonal lines of the frame portion 41.

The covering member 40 of the present embodiment is not provided with the structure corresponding to the elastic portion 28 exemplified in embodiment 1.

Next, the operation and effects of the present embodiment will be described.

(5) The cover member 40 is integrally formed with the pair of bus bars 10.

According to such a configuration, the pair of bus bars 10 is integrated by the covering member 40. Therefore, the heat radiation performance of the bus bar 10 can be improved and the assembling workability to the housing 50 can be improved at the same time.

(6) The contact portion 46 is provided between the bus bars 10 adjacent to each other.

According to this configuration, since the contact portions 46 are provided between the bus bars 10 adjacent to each other, the portions of the frame 50 that the contact portions 46 contact can be collected. Therefore, the structures of the covering member 40 and the frame 50 can be simplified.

< modification example >

The above embodiment can be modified as follows, for example. The present embodiment and the following modifications can be combined and implemented within a range not technically contradictory to each other.

The number and shape of the weight-reducing portions 24 may be appropriately changed. In addition, the weight reduction portion 24 can be omitted.

The number and shape of the weight-reducing portions 25 may be appropriately changed. In addition, the weight reduction portion 25 can be omitted.

In embodiment 2, a pair of contact portions 46 may be provided corresponding to the pair of bus bars 10, respectively.

In embodiment 2, the covering member 40 may be integrally formed with three or more bus bars 10.

The elastic portion 28 of embodiment 1 may be omitted.

A structure corresponding to the elastic portion 28 illustrated in embodiment 1 may be attached to the back surface of the plate portion 42. That is, the elastic portion may not be integrally formed with the main body portion of the covering member.

The projection 27 of embodiment 1 may be omitted. In this case, the fitting recess 33 of the housing 30 may be omitted.

In embodiment 1, the thickness of the main body 21 of the covering member 20 may be constant. In embodiment 2, the protruding portions 43 and the ribs 44 may be omitted from the plate portion 42 of the covering member 40.