JP7410010B2 - resin structure - Google Patents

Description

The present invention relates to a resin structure.

2. Description of the Related Art Conventionally, electrical connection boxes that are constructed by assembling a plurality of resin bodies together have been proposed. Generally, an electrical junction box is composed of a block body and a frame. Furthermore, the electrical junction box is mounted on a vehicle, for example, and its circuit configuration differs depending on the type and grade of the vehicle in which it is mounted. For this reason, the inside of the block body is composed of a base area that is commonly used for all vehicles, and one or more option areas that are used only for some vehicles (for example, (See Patent Documents 1-3.)

In the conventional electrical connection box described above, a base block having a base circuit is housed in the base area, and a cavity is previously provided in the optional area. An option block having an option circuit depending on the model and grade of the vehicle is mounted in the cavity.

Japanese Patent Application Publication No. 2003-125516 Japanese Patent Application Publication No. 2007-37381 JP 2018-7424 Publication

Generally, in an electrical connection box, bus bars included in a base block and an option block are overlapped and fastened to each other using screws or the like. Thereby, the base block and the option block are electrically connected to each other. However, since electrical junction boxes are mounted on vehicles, complex vibrations within the vehicle can cause multiple blocks to move in different directions, or even if they move in approximately the same direction, the vibration frequencies may differ. Ta. Therefore, frames and base blocks sometimes move differently from frames and option blocks (so-called different-phase movements). As a result, a large stress (specifically, tension, attractive force, etc. between the bus bars) is applied to the joint portions of the bus bars. As a result, stress is generated around the fastening portion of the bus bar, and there is a risk that the bus bar may be damaged.

Additionally, the block body is generally molded from a resin material that is more rigid than the frame. That is, the frame is molded from a resin material that is more easily deformed (for example, distorted) during complex vibrations within the vehicle than the block body. For this reason, if the block body and frame are formed separately, large vibrations inside the vehicle will cause displacement in the engagement area between the frame and the base block, and the engagement area between the frame and the optional block. There was a risk that this would occur. When each displacement occurs, the base block and the option block each tend to wobble with respect to the frame, increasing the possibility that the above-mentioned out-of-phase movement will occur.

The present invention has been made in view of the above-mentioned situation, and its purpose is to suppress the stress caused by the external force applied to the fastening points between the bus bars of the plurality of blocks constituting the resin body and to each bus bar. The structure is provided.

In order to achieve the above-mentioned object, the resin structure according to the present invention is characterized by the following [1] to [2].
[1]
A resin structure comprising a first resin body on which electronic components are mounted, and a second resin body assembled with the first resin body,
The first resin body is
comprising a first block and a second block accommodated in the first block,
The first block is
a housing section surrounded by an inner wall that houses the second block inside the first block;
The second block has a second bus bar and a first bus bar fastened by bolts and nuts ,
The first resin body is made of a resin material having higher rigidity than the second resin body,
The first block, which partially includes the entire inner wall surrounding the housing part, is made of a single resin body.
Must be a resin structure.
[2]
In the resin structure according to [1] above,
The first block is
configured such that one of the second blocks selected from among the plurality of second blocks of different sizes can be accommodated in the storage section,
The accommodating part is
It is possible to accommodate the largest second block among the selectable second blocks;
Must be a resin structure.

According to the resin structure having the configuration [1] above, in the first resin body, the first bus bar of the first block and the second bus bar of the second block are fastened, so that the first block and the second bus bar are connected to each other. are electrically connected. Moreover, since the second block is accommodated in the accommodation section surrounded by the inner wall of the first block, the second block does not come into contact with the second resin body. As a result, in the resin structure of this configuration, the first block and the second block move in different phases due to complex vibrations inside the vehicle, unlike a conventional resin structure (electrical junction box). things are suppressed. Specifically, since the second block is accommodated in the housing section surrounded by the inner wall of the first block, the second block moves in the same phase as the first block. That is, in the resin structure of this configuration, the movements of the first block and the second block in different phases are suppressed.

Furthermore, the second block is not easily affected even if the first resin body and the second resin body are made of different resin materials. Specifically, if the second resin body is more easily deformed (e.g., distorted) than the first resin body, there is a risk that displacement will occur between the first resin body and the second resin body; For this reason, relative displacement between the first block and the second block constituting the first resin body is suppressed. In particular, when the first block and the second block are made of the same resin material, displacement between the first block and the second block is more strongly suppressed. In other words, in the resin structure of this configuration, the first block and the second block are less likely to move in different phases due to the different resin materials of the first resin body and the second resin body.

As a result, the resin structure of this configuration has a fastening point between the bus bars (i.e., the first bus bar and the second bus bar) of the first block and the second block constituting the first resin body, and an external force applied to each bus bar. The stress caused by this can be suppressed.

Furthermore, according to the resin structure having the configuration described in [ 1 ] above, the first resin body is formed from a resin having higher rigidity than the second resin body, so that the first resin body has a higher rigidity than the second resin body. Hard to deform. Although this may cause displacement between the first resin body and the second resin body, for the same reason as above, the relative displacement between the first block and the second block constituting the first resin body displacement is suppressed. In particular, when the first block and the second block are made of the same resin material, displacement between the first block and the second block is more strongly suppressed. In other words, in the resin structure of this configuration, the first block and the second block are less likely to move to different phases due to the different resin materials of the first resin body and the second resin body. As a result, the resin structure of this configuration has a fastening point between the bus bars (i.e., the first bus bar and the second bus bar) of the first block and the second block constituting the first resin body, and an external force applied to each bus bar. The stress caused by this can be suppressed more appropriately.

According to the resin structure having the configuration described in [ 2 ] above, the accommodating portion can accommodate the largest second block among the plurality of second blocks of different sizes, so that it is possible to Can accommodate differences in circuit configurations due to differences. As a result, in the resin structure of this configuration, the second block can be selected according to the type and grade of the vehicle in which it is mounted.

As described above, according to the present invention, it is possible to provide a resin structure that suppresses stress caused by external force applied to the fastening portions of the bus bars of the plurality of resin bodies constituting the resin structure and the external force applied to each bus bar.

The present invention has been briefly described above. Further, details of the present invention will become clearer by reading the detailed description described below with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view of a resin structure according to an embodiment of the present invention. FIG. 2 is a front view of the first resin body according to the embodiment of the present invention, viewed from above. FIG. 3 is an exploded perspective view of the first resin body in FIG. 2. FIG. 4 is an exploded perspective view of the first block and the first bus bar. FIG. 5 is an exploded perspective view of the second block and the second bus bar. FIG. 6(a) is a perspective view showing a fastened state of the first bus bar and the second bus bar, and FIG. 6(b) is a side view of FIG. 6(a). FIG. 7 is a front view from above of the first resin body in which a second block different from that in FIG. 2 is selected.

<Embodiment>
Hereinafter, a resin structure 1 according to an embodiment of the present invention shown in FIG. 1 will be described with reference to the drawings. The resin structure 1 is typically a relay box (electrical connection box) that is mounted on a vehicle and houses electronic components such as relays.

As shown in FIG. 1, the resin structure 1 is assembled to surround the outer periphery of the block body 10 and the block body 10 in which the relay and other electronic components (and other components, not shown) are housed. The frame 20 shown in FIG. Each of the block body 10 and the frame 20 is a resin structure 1. The block body 10 corresponds to the "first resin body" of the present invention, and the frame 20 corresponds to the "second resin body" of the present invention.

Hereinafter, for convenience of explanation, "vertical direction", "circumferential direction", "internal/internal direction", "upper", "lower", "inner", and "outer" will be defined as shown in FIGS. 1 to 6. The "vertical direction", "circumferential direction", and "internal/internal direction" are orthogonal to each other. In the resin structure 1, the "vertical direction" corresponds to the direction in which the block body 10 and the frame 20 are assembled. The "circumferential direction" corresponds to the circumferential direction of the later-described peripheral wall 11 of the block body 10 and the later-described peripheral wall 21 of the frame 20, and the "internal-internal direction" corresponds to the thickness direction of the peripheral wall 11 and the peripheral wall 21.

In the resin structure 1, as shown in FIG. 1, engagement points (i.e., engagement portions 12 and 22) are provided at multiple locations (four locations in this example) in the circumferential direction. . At the engagement location, the block body 10 and the frame 20 are engaged in order to prevent them from being separated in the vertical direction when they are assembled. Hereinafter, each member constituting the resin structure 1 will be explained in order.

First, the block body 10 will be explained. The block main body 10 is molded from a resin material such as polyphenylene ether (PPE), and as shown in FIG. 1, has a substantially rectangular cylindrical peripheral wall 11 that is partially recessed and extends in the vertical direction. The peripheral wall 11 of the block body 10 is provided with an engaging portion 12 that is engaged with an engaging portion 22 of the frame 20 .

As shown in FIG. 2, the block body 10 is composed of a base block 30 and an option block 40. Specifically, the block main body 10 is configured by assembling the optional block 40 from above into the housing portion 32 of the base block 30 (described later) (see FIG. 3).

As shown in FIGS. 3 and 4, the base block 30 includes a peripheral wall 31, a housing portion 32, an inner wall 33, and a base-side bus bar 300. The peripheral wall 31 constitutes the peripheral wall 11, and like the peripheral wall 11, has a substantially rectangular cylindrical shape that is partly depressed and extends in the vertical direction. That is, the outer shape of the base block 30 is the same as the outer shape of the block body 10.

The accommodating portion 32 is surrounded by an inner wall 33 (including, for example, the inner side of the peripheral wall 31) and is provided inside the base block 30. An option block 40 is assembled into the accommodating portion 32. The size of the storage section 32 is such that it can accommodate the largest option block 40 among the selectable option blocks 40, as will be described later.

A first engaging portion 35 (see FIGS. 2 and 7) is provided on the inner wall 33 and is engaged with a second engaging portion 42 of the option block 40. Specifically, a plurality of first engaging portions 35 are arranged on the inner wall 33 forming the accommodating portion 32 so as not to overlap each other on the short side in the circumferential direction (the left-right direction in FIG. 2). By arranging the first engaging portion 35 in this manner, the option block 40 can be properly placed inside the housing portion 32 regardless of the size of the option block 40 accommodated in the housing portion 32, as described later. It becomes possible to hold the Then, the option block 40 is assembled to the base block 30 by engaging the first engaging portion 35 and the second engaging portion 42 .

The base-side bus bar 300 has, for example, an engaging portion (not shown), and the engaging portion of the base-side bus bar 300 and the bus bar engaging portion (not shown) of the base block 30 are engaged. Note that the base-side bus bar 300 may be insert-molded in the base block 30. As shown in FIGS. 4 and 6, the base side bus bar 300 includes a fastening section 301 that is fastened to the option side bus bar 400, a main body section 302 that is connected to an electronic component (for example, a base circuit), and a fastening section 301. The connecting portion 303 connects the main body portion 302 to the main body portion 302.

The fastening portion 301 is provided with an insertion hole 301a through which the bolt 2 is inserted. The insertion hole 301a is fastened together with the insertion hole 401a of the optional side bus bar 400 by bolts 2 and nuts 3. As shown in FIG. 4, the fastening portion 301 and the main body portion 302 are spaced apart from each other in the circumferential direction and the vertical direction, and are connected by a connecting portion 303.

As shown in FIGS. 3 and 5, the option block 40 includes a peripheral wall 41, a second engaging portion 42, and an option-side bus bar 400. The peripheral wall 41 has a substantially rectangular cylindrical shape extending in the vertical direction, and a second engaging portion 42 is provided outside the peripheral wall 41 . The outer shape of the peripheral wall 41 has a shape that follows the accommodation portion 32 . Thereby, the option block 40 can be accommodated in the base block 30 (namely, the accommodating portion 32).

The option-side bus bar 400 has, for example, an engaging portion (not shown), and the engaging portion of the option-side bus bar 400 and the bus bar engaging portion (not shown) of the option block 40 are engaged. Note that the option-side bus bar 400 may be insert-molded in the option block 40. As shown in FIGS. 5 and 6, the option-side bus bar includes a fastening portion 401 that is fastened to the base-side bus bar 300, a main body portion 402 that is connected to an electronic component (for example, an optional circuit), and a fastening portion 401. It is composed of a connecting portion 403 that connects to a main body portion 402.

The fastening portion 401 is provided with an insertion hole 401a through which the bolt 2 is inserted. The insertion hole 401a is fastened together with the insertion hole 301a of the base-side bus bar 300 by bolts 2 and nuts 3. As shown in FIG. 5, the fastening portion 401 and the main body portion 402 are spaced apart in the circumferential direction and the vertical direction, and are connected by a connecting portion 403.

By fastening the base side bus bar 300 and the option side bus bar 400 with the bolts 2 and nuts 3, electricity is supplied between the base block and the option block. In other words, the base block and option block become an integrated circuit.

In addition, the base side bus bar 300 and the option side bus bar 400 are fastened with the bolts 2 and nuts 3, so that the fastening portion 301 and the fastening portion 401 overlap. In other words, by overlapping the two busbars, the thickness of the busbar is doubled, resulting in high heat resistance.

Next, frame 20 will be explained. The frame 20 is molded from a resin material such as polypropylene (PP), and, as shown in FIG. 1, has a substantially rectangular cylindrical peripheral wall 21 that is partially recessed and extends in the vertical direction. An engaging portion 22 that is engaged with the engaging portion 12 of the block body 10 is provided inside the peripheral wall 21 . An engaging portion 23 that is to be engaged with, for example, a lower cover (not shown) is provided outside and below the peripheral wall 21 .

Note that the engaging portion 23 may be provided outside and above the peripheral wall 21 and engaged with an upper cover (not shown). Further, the engaging portion 23 may be provided outside and above the peripheral wall 21 and outside and below the peripheral wall 21 and engaged with the upper cover and the lower cover.

Next, selection of option block 40 will be explained. Generally, the circuit configuration of the resin structure 1 differs depending on the type and grade of the vehicle in which it is mounted. In other words, as shown in FIGS. 2 and 7, the number of required circuits (i.e., option circuits) differs depending on the vehicle type and grade, so the size of the option block 40 varies depending on the vehicle in which it is installed. change.

As shown in FIG. 2, the selected option block 40 has the same size as the accommodating part 32 of the base block 30 (i.e., the accommodating part 32 accommodates the largest option block 40 among the selectable option blocks 40). (Designed to be accommodating). For example, from the perspective of the vehicle grade, the block body 10 (i.e., the resin structure 1) shown in FIG. It will be installed.

As shown in FIG. 7, the selected option block 40 is approximately half the size of the housing portion 32 of the base block 30. As shown in FIG. Similar to FIG. 2, from the perspective of vehicle grade, the block body 10 (namely, resin structure 1) shown in FIG. 7 is mounted on a middle grade vehicle. That is, the resin structure 1 shown in FIG. 2 has a higher grade than the resin structure 1 shown in FIG.

As mentioned above, the size of the option block 40 varies depending on the specifications. For example, when the largest option block 40 is accommodated, the first engaging portion 35 and the second engaging portion 42 are engaged at three locations (see FIG. 2). Furthermore, when the smallest option block 40 is accommodated, the first engaging portion 35 and the second engaging portion 42 are engaged at one location (see FIG. 7). Therefore, the option block 40 of the resin structure 1 can be selected depending on the specifications of the vehicle in which the resin structure 1 is mounted. In addition, in this embodiment, although the 1st engaging part 35 is three places, it is not restricted to this.

<Action/Effect>
According to the resin structure 1 according to the present embodiment, in the block body 10, the base side bus bar 300 of the base block 30 and the option side bus bar 400 of the option block 40 are fastened, so that the base block 30 and the option block 40 are connected to each other. are electrically connected. Further, since the option block 40 is accommodated in the accommodating portion 32 surrounded by the inner wall 33 of the base block 30, the option block 40 does not come into contact with the frame 20. As a result, unlike the conventional resin structure (electrical junction box), the resin structure 1 according to the present embodiment has a structure in which the base block 30 and the option block 40 are separated from each other due to complex vibrations inside the vehicle. Movement in phase is suppressed. Specifically, since the option block 40 is housed in the housing portion 32 surrounded by the inner wall 33 of the base block 30, the option block 40 moves in the same direction as the base block 30, so-called in phase. That is, in the resin structure 1 according to the present embodiment, movement of the base block 30 and the option block 40 in different phases is suppressed.

Furthermore, the option block 40 is not easily affected even if the block body 10 and the frame 20 are made of different resin materials. Specifically, if the frame 20 is more easily deformed (for example, distorted) than the block body 10, there is a risk that displacement will occur between the block body 10 and the frame 20. Relative displacement between the base block 30 and the option block 40 constituting the base block 10 is suppressed. In particular, when the base block 30 and the option block 40 are made of the same resin material, the displacement between the base block 30 and the option block 40 is more strongly suppressed. That is, in the resin structure 1 according to the present embodiment, the base block 30 and the option block 40 are less likely to move in different phases due to the different resin materials of the block body 10 and the frame 20.

As a result, the resin structure 1 according to the present embodiment has the fastening points of the bus bars (i.e., the base side bus bar 300 and the option side bus bar 400) of the base block 30 and the option block 40 that constitute the block body 10, and Stress caused by external force applied to the bus bar can be suppressed.

Further, according to the resin structure 1 according to the present embodiment, the block body 10 is made of a resin having higher rigidity than the frame 20, so that the block body 10 is less likely to deform than the frame 20. Although this may cause displacement between the block body 10 and the frame 20, for the same reason as above, the relative displacement between the base block 30 and the optional block 40 that constitute the block body 10 is suppressed. In particular, when the base block 30 and the option block 40 are made of the same resin material, the displacement between the base block 30 and the option block 40 is more strongly suppressed. That is, in the resin structure 1 according to the present embodiment, the base block 30 and the option block 40 are less likely to move in different phases due to the different resin materials of the block body 10 and the frame 20. As a result, the resin structure 1 according to the present embodiment has the fastening points of the bus bars (i.e., the base side bus bar 300 and the option side bus bar 400) of the base block 30 and the option block 40 that constitute the block body 10, and Stress caused by external force applied to the bus bar can be more appropriately suppressed.

Furthermore, according to the resin structure 1 according to the present embodiment, since the base block 30 and the option block 40 are made of the same resin material, the displacement between the base block 30 and the option block 40 is made stronger. suppressed. As a result, the resin structure 1 according to the present embodiment has the fastening points of the bus bars (i.e., the base side bus bar 300 and the option side bus bar 400) of the base block 30 and the option block 40 that constitute the block body 10, and Stress caused by external force applied to the bus bar can be more appropriately suppressed.

Furthermore, according to the resin structure 1 according to the present embodiment, the accommodation portion 32 can accommodate the largest option block 40 among the plurality of option blocks 40 of different sizes, so that the model and grade of the vehicle in which it is mounted can be accommodated. It is possible to accommodate differences in circuit configurations due to differences in etc. As a result, in the resin structure 1 according to the present embodiment, the option block 40 can be selected according to the type and grade of the vehicle in which it is mounted.

<Other forms>
Note that the present invention is not limited to the embodiments described above, and can be modified, improved, etc. as appropriate. In addition, the material, shape, size, number, arrangement location, etc. of each component in the above-described embodiments are arbitrary as long as the present invention can be achieved, and are not limited.

Here, the features of the embodiments of the resin molded article according to the present invention described above are briefly summarized and listed below in [1] to [4].
[1]
A resin structure (1) comprising a first resin body (block body 10) on which electronic components are mounted, and a second resin body (frame 20) to be assembled with the first resin body. hand,
The first resin body (block body 10) is
It has a first block (base block 30) and a second block (optional block 40) accommodated in the first block,
The first block (base block 30) is
an accommodating part (32) surrounded by an inner wall (33) accommodating the second block inside the first block;
a first bus bar (base side bus bar 300) that is fastened to a second bus bar (optional side bus bar 400) of the second block;
Resin structure (1).
[2]
In the resin structure (1) described in [1] above,
The first resin body (block body 10) is made of a resin material having higher rigidity than the second resin body (frame 20).
Resin structure (1).
[3]
In the resin structure (1) described in [1] or [2] above,
The first block (base block 30) and the second block (option block 40) are made of the same resin material,
Resin structure (1).
[4]
In the resin structure (1) according to any one of [1] to [3] above,
The first block (base block 30) is
The second block (optional block 40) selected from among the plurality of second blocks (optional blocks 40) having different sizes is configured to be accommodating in the storage part,
The accommodating part (32) is
It is possible to accommodate the largest second block (option block 40) among the selectable second blocks (option block 40);
Resin structure (1).

1 Resin structure 10 Block body (first resin body)
20 Frame (second resin body)
30 Base block (1st block)
32 Storage part 33 Inner wall 40 Option block (second block)
300 Base side bus bar (first bus bar)
400 Option side bus bar (second bus bar)
401 Fastening section 402 Main body section 403 Connection section

Claims (2)

A resin structure comprising a first resin body on which electronic components are mounted, and a second resin body assembled with the first resin body,
The first resin body is
comprising a first block and a second block accommodated in the first block,
The first block is
a housing section surrounded by an inner wall that houses the second block inside the first block;
The second block has a second bus bar and a first bus bar fastened by bolts and nuts ,
The first resin body is made of a resin material having higher rigidity than the second resin body,
The first block, which partially includes the entire inner wall surrounding the housing part, is made of a single resin body.
Resin structure. The resin structure according to claim 1,
The first block is
configured such that one of the second blocks selected from among the plurality of second blocks of different sizes can be accommodated in the storage section,
The accommodating part is
It is possible to accommodate the largest second block among the selectable second blocks;
Resin structure.

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