Bass unit

Abstract

The objective is to provide a busbar unit that can maintain an appropriate fastening state. [Solution] The busbar unit 1 is formed by laminating multiple plate materials 21 and comprises a main body 2 having through holes 22 that penetrate through both sides, and a cylindrical part 3 that is cylindrical and inserted into the through holes 22. By inserting the cylindrical part 3 into the main body 2 and inserting a fastening member 4 into the cylindrical part 3 to fasten the busbar unit 1, the proper fastening state of the busbar unit 1 can be maintained.

Description

Technical Field

[0001] The present invention relates to a bus bar unit.

Background Art

[0002] Conventionally, as related to bus bar units, for example, as described in Patent Document 1, there is known a structure in which two plate-shaped bus bars are connected by a fastening member. This bus bar unit attempts to reduce contact resistance by performing spray coating on the contact surfaces between the bus bars.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in this type of bus bar unit, the bus bar may be configured by laminating a plurality of plate materials. In this case, the bus bar is fastened by inserting a fastening member in the stacking direction of the plate materials.

[0005] However, such a bus bar unit has room for improvement in that it is difficult to maintain an appropriate fastening state. For example, when a fastening member is inserted through a bus bar formed by laminating plate materials, if the plate materials slide in a direction intersecting the stacking direction, there is a concern that the plate materials will contact the fastening member and the fastening member will loosen, making it impossible to maintain an appropriate fastening state.

[0006] Therefore, an object of the present invention is to provide a bus bar unit capable of maintaining an appropriate fastening state.

Means for Solving the Problems

[0007] In other words, the busbar unit according to the present invention is configured to include a main body formed by laminating plate material and having through holes that penetrate through both sides, and a cylindrical part that is cylindrical and inserted into the through holes. [Effects of the Invention]

[0008] According to the busbar unit of the present invention, it is possible to maintain an appropriate fastening state. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view of a busbar unit according to an embodiment. [Figure 2] Figure 2 is a cross-sectional view of the busbar unit at line II-II in Figure 1. [Figure 3] Figure 3 is a plan view of a busbar unit according to an embodiment. [Figure 4] Figure 4 is an explanatory diagram of a busbar unit in a comparative example. [Figure 5] Figure 5 is an explanatory diagram of a busbar unit in a comparative example. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited by these embodiments. Furthermore, some of the components in the following embodiments may be easily substituted or substantially identical to those that are easily substituted by those skilled in the art.

[0011] [Embodiment] This embodiment relates to a busbar unit. In the following description, of the three intersecting directions, the first direction is referred to as the "extension direction X," the second direction as the "width direction Y," and the third direction as the "stack direction Z." Here, the extension direction X, the width direction Y, and the stacking direction Z are mutually orthogonal. Note that "orthogonal" here includes approximately orthogonal. The extension direction X corresponds, for example, to the direction in which the busbar unit extends. The stacking direction Z corresponds, for example, to the direction in which the plate materials of the busbar unit are stacked. Unless otherwise specified, the directions used in the following description represent the directions when the parts are assembled together.

[0012] As shown in Figure 1, the busbar unit 1 of this embodiment is a conductive member or wiring member that makes electrical connections, and is used, for example, mounted on a vehicle to connect batteries, electrical equipment, or connecting components. The busbar unit 1 comprises a main body 2 and a cylindrical part 3. The main body 2 is the main body portion of the busbar unit 1 and is the part that functions as a busbar. The main body 2 extends in the extending direction X and transmits current or signals.

[0013] The main body 2 is constructed by laminating plate materials 21 and is formed in a plate shape. Multiple plate materials 21 are provided and arranged in stacking directions Z. The plate materials 21 are formed, for example, in a rectangular shape and extend for a long distance in the extension direction X. The plate materials 21 are laminated with their ends in the extension direction X and their ends in the width direction Y aligned. The main body 2 is constructed, for example, by laminating three plate materials 21. However, the number of laminated plate materials 21 is not limited to this and may be, for example, two or four or more.

[0014] The plate material 21 is formed from a conductive material, such as aluminum. In other words, the plate material 21 is made of aluminum or an alloy mainly composed of aluminum. By making the plate material 21 and the main body 2 from aluminum, the weight of the busbar unit 1 can be reduced. This reduces the transportation cost of the busbar unit 1 and improves its handling and routing capabilities. Furthermore, by making the plate material 21 and the main body 2 from aluminum, the corrosion resistance of the busbar unit 1 can be increased. Moreover, by making the plate material 21 and the main body 2 from aluminum, the processability of the busbar unit 1 can be improved, making the manufacture of the busbar unit 1 easier. Note that the plate material 21 and the main body 2 may also be formed from conductive materials other than aluminum.

[0015] The main body portion 2 has through holes 22 formed therein. The through holes 22 are holes that penetrate both the front and back surfaces of the plate-shaped main body portion 2 and are used as holes for inserting the cylindrical portion 3. The through holes 22 are formed along the lamination direction Z and are provided, for example, at the end of the main body portion 2. The through holes 22 penetrate between the front surface 2A and the back surface 2B of the main body portion 2 and are formed to penetrate all of the laminated plate material 21. In other words, the through holes 22 are formed at the same position in the plate material 21 in the extension direction X and the width direction Y.

[0016] The cylindrical portion 3 is a cylindrical body and is formed to a size that allows it to be inserted into the through hole 22. For example, the cylindrical portion 3 is formed to have an outer diameter that allows it to be press-fitted into the through hole 22 and inserted through it. The cylindrical portion 3 is provided by being inserted into the through hole 22 by press-fitting it, so that it does not easily come out of the through hole 22, and is provided, for example, to be integrated with the main body portion 2. The cylindrical portion 3 forms an inner hole 31. The inner hole 31 is used as a hole for inserting the fastening member 4.

[0017] The cylindrical portion 3 is formed of a conductive material, for example, made of copper. That is, the plate material 21 is formed of copper or an alloy mainly composed of copper. In this case, the cylindrical portion 3 can remove the oxide film of the aluminum-made main body portion 2 when being press-fitted into the through hole 22. That is, when an oxide film is formed on the inner surface of the through hole 22, the oxide film can be removed by press-fitting the cylindrical portion 3 into the through hole 22, and corrosion of the main body portion 2 can be suppressed. Note that the cylindrical portion 3 may be formed of a conductive material other than copper.

[0018] The fastening member 4 is a member for fastening the busbar unit 1 to a fastened object, for example, a bolt is used. The fastening member 4 is configured by connecting a body portion 41 and a seating portion 42, and is screwed with a nut (not shown) for example. The body portion 41 is a portion inserted into the inner hole 31, and is formed in a columnar shape, for example, with a thread groove engraved on the outer periphery. The seating portion 42 is the head of the fastening member, and is provided at the end of the body portion 41. The seating portion 42 seats on the end face 32 of the cylindrical portion 3 or the surface 2A of the main body portion 2 and presses the busbar unit 1 according to the fastening. The seating portion 42 is formed larger in the radial direction than the body portion 41, and is formed larger than the inner hole 31. For example, the seating portion 42 has a hexagonal cross-section in a direction intersecting the axial direction of the body portion 41, and is formed larger than the cross-section of the body portion 41.

[0019] Note that the shape of the seating portion 42 is not limited to this. Also, when using a stud bolt and a nut as the fastening member 4 for example, the stud bolt functions as the body portion 41 and the nut functions as the seating portion 42.

[0020] As shown in FIG. 3, the cylindrical portion 3 is formed larger than the seating portion 42 of the fastening member 4 for example. That is, the end face 32 of the cylindrical portion 3 is formed larger than the seating portion 42 of the fastening member 4. That is, the seating portion 42 is accommodated within the area of the end face 32 of the cylindrical portion 3. Thereby, the fastening force by the fastening member 4 can be received by the cylindrical portion 3, and it can be suppressed that the fastening force is applied to the main body portion 2.

[0021] In some cases, the seating portion 42 of the fastening member 4 may be formed larger than the cylindrical portion 3. In this case, the seating portion 42 is contacted with the cylindrical portion 3 in a larger range compared to the main body portion 2. As a result, most of the fastening force by the fastening member 4 can be received by the cylindrical portion 3, and it is possible to suppress the fastening force from being applied to the main body portion 2.

[0022] Next, the assembly and fastening reliability of the bus bar unit 1 according to the present embodiment will be described.

[0023] As shown in FIG. 1, the bus bar unit 1 is assembled by fastening to a fastened object using a fastening member 4. First, the bus bar unit 1 is routed along a preset wiring path. Then, the bus bar unit 1 is fastened and assembled to the fastened object by the fastening member 4. That is, the fastening member 4 is inserted through the cylindrical portion 3, and the bus bar unit 1 and the fastened object are fastened. At this time, since the fastening member 4 is inserted through the inner hole 31 of the cylindrical portion 3 instead of the through hole 22 formed in the main body portion 2, it is smoothly inserted into the bus bar unit 1.

[0024] For example, when the cylindrical portion 3 is not provided as in the bus bar unit 100 shown in FIG. 4, the laminated plate materials 21 slide and shift in the extending direction X or the width direction Y, making it difficult to insert the fastening member 4 through each plate material 21. That is, unevenness occurs on the inner surface of the through hole 22 through which the fastening member 4 is inserted due to the sliding of the plate material 21, making it difficult or impossible to insert the fastening member 4. On the other hand, in the bus bar unit 1 according to the present embodiment, since the cylindrical portion 3 is provided on the plate material 21, the fastening member 4 can be smoothly inserted through the inner hole 31 of the cylindrical portion 3 regardless of the state of the plate material 21. Therefore, the assembly of the bus bar unit 1 can be easily performed.

[0025] After the bus bar unit 1 is routed and assembled, the fastening state can be appropriately maintained by the fastening member 4, and the fastening reliability is high. That is, in the bus bar unit 1, even if the plate material 21 slides in the extending direction X or the width direction Y, it is difficult for the fastening member 4 to receive a pressing force from the plate material 21, and loosening of the fastening by the fastening member 4 is suppressed.

[0026] For example, in the busbar unit 100 shown in Figure 5, if the cylindrical portion 3 is not provided, when the stacked plate materials 21 slide in the extending direction X or the width direction Y, the plate materials 21 will press against the fastening member 4. As a result, the busbar unit 100 may become loose due to the fastening member 4, and proper fastening may not be maintained. In contrast, in the busbar unit 1 according to this embodiment, the cylindrical portion 3 is provided, which prevents the fastening member 4 from receiving pressure from the plate materials 21, and allows proper fastening to be maintained.

[0027] As described above, the busbar unit 1 according to this embodiment includes a cylindrical portion 3, which allows the fastening member 4 to be inserted into the cylindrical portion 3, and the fastened state by the fastening member 4 can be properly maintained. Furthermore, the busbar unit 1 according to this embodiment includes a cylindrical portion 3, which allows for smooth insertion and fastening of the fastening member 4, and facilitates assembly.

[0028] Furthermore, the busbar unit 1 according to this embodiment, by including the cylindrical portion 3, can suppress a decrease in fastening force due to welding when the fastening member 4 is welded and fixed. For example, in the busbar unit 1, after fastening with the fastening member 4, it is conceivable to weld and fix the seating portion 42 of the fastening member 4 to the main body 2 or the cylindrical portion 3. In this case, the busbar unit 1 according to this embodiment can receive the heat input from the welding of the fastening member 4 at the cylindrical portion 3, and the effect of welding on the main body 2 can be suppressed. As a result, the formation of voids between the plate materials 21 of the main body 2 can be suppressed, and the softening of the main body 2 due to the heat input to the main body 2 can be suppressed.

[0029] Furthermore, in the busbar unit 1 according to this embodiment, if the main body 2 is constructed by laminating aluminum plate material 21, the cylindrical portion 3 is press-fitted into the main body 2, thereby allowing the oxide film to be removed even if an oxide film is formed on the main body 2.

[0030] Furthermore, in the busbar unit 1 according to this embodiment, the cylindrical portion 3 is formed to be larger than the seating portion 42 of the fastening member 4, thereby suppressing the fastening force applied to the main body portion 2 by the fastening member 4.

[0031] It should be noted that the busbar unit according to the present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. The busbar unit 1 according to this embodiment may be constructed by appropriately combining the components of the embodiments described above.

[0032] For example, although the busbar unit 1 according to the above embodiment was described as being used when mounted on a vehicle, it may also be used without being mounted on a vehicle. [Explanation of symbols]

[0033] 1: Bus unit 2: Main body 3: Cylinder part 4: Fastening member 21: Board material 22: Through hole 42: Seating area

Claims

1. The main body is formed by laminating plate material and has through holes that penetrate both the front and back sides, It comprises a cylindrical portion that is inserted through the through hole, Bass unit.

2. The main body is constructed by laminating the aluminum plate material. The busbar unit according to claim 1.

3. The cylindrical portion is formed to be larger than the seating portion of the fastening member that is inserted into the cylindrical portion. The busbar unit according to claim 1 or 2.

Images