JP2024025506A - Busbar fixing structure - Google Patents

Abstract

To provide a busbar fixing structure that can absorb dimensional tolerances between a busbar and a target member, and also relieve stress at the fixing point between the busbar and the target member even when the dimensional tolerances occur.SOLUTION: A busbar fixing structure 1 includes a plate-shaped busbar 10 having a hole 12, a bolt 20 inserted into the hole 12, an elastic member 40 into which the bolt 20 is inserted and which is elastically deformable, and a target member 50 to which the busbar 10 is fixed. The hole 12 is formed in the form of a long hole extending in an extension direction of the busbar 10, and the busbar 10 is placed between the elastic member 40 and the target member 50 in the axial direction of the bolt 20. In the busbar fixing structure 1, the elastic member 40 elastically contacts the busbar 10 so that the busbar 10 is pressed against the target member 50.SELECTED DRAWING: Figure 4

Description

The present invention relates to a bus bar fixing structure.

Conventionally, structures have been proposed for fixing bus bars to various target members (see, for example, Patent Document 1). The conventional bus bar fixing structure fixes the bus bar to the target member by, for example, inserting a bolt into a hole in the bus bar and a hole in the target member and screwing a nut into the hole.

Japanese Patent Application Publication No. 2020-137179

By the way, in the conventional bus bar fixing structure, if a dimensional tolerance occurs between the bus bar and the target member due to expansion and contraction due to manufacturing tolerances, heat, etc., the bus bar does not have elasticity, so the target member There was a risk that it would be difficult or impossible to fix the bus bar. Furthermore, in the above case, even if the bus bar could be fixed to the target member, stress would be applied to the fixing location (i.e., the fastening portion), so there was a risk that the component would be damaged.

The present invention was made in view of the above-mentioned situation, and its purpose is to absorb the dimensional tolerance between the bus bar and the target member, and also to fix the bus bar and the target member even when a dimensional tolerance occurs. An object of the present invention is to provide a bus bar fixing structure capable of relieving stress at locations.

In order to achieve the above-mentioned object, the bus bar fixing structure according to the present invention has the following features.

A plate-shaped bus bar having a hole, a bolt inserted into the hole, a nut screwed onto the bolt, an elastic member through which the bolt is inserted and is elastically deformable, and the bus bar is fixed. A bus bar fixing structure comprising: a target member;
The hole portion is formed in a long hole shape extending in the extending direction of the bus bar,
The bus bar is
disposed between the elastic member and the target member in the axial direction of the bolt,
The fixed structure of the bus bar is
the elastic member makes elastic contact with the bus bar so as to press the bus bar against the target member;
The bus bar must have a fixed structure.

The bus bar fixing structure according to the present invention will be described below.
According to the bus bar fixing structure of this configuration, the hole portion of the bus bar is formed in the shape of a long hole extending in the extending direction of the bus bar. Thereby, even if a dimensional tolerance occurs between the bus bar and the target member, it can be absorbed by the hole. Moreover, according to the bus bar fixing structure of this configuration, the elastic member comes into elastic contact with the bus bar so as to press the bus bar against the target member. That is, the bus bar is fixed to the target member by the elastic force of the elastic member. For this reason, even if a dimensional tolerance occurs between the bus bar and the target member, no stress is applied to the fixing location between the bus bar and the target member. In this way, the bus bar fixing structure of this configuration can absorb the dimensional tolerance between the bus bar and the target member, and even if a dimensional tolerance occurs, it can relieve the stress at the fixing location between the bus bar and the target member.

The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the mode for carrying out the invention (hereinafter referred to as "embodiment") described below with reference to the accompanying drawings. .

FIG. 1 is a perspective view showing a bus bar fixing structure according to an embodiment of the present invention. FIG. 2 is a right side view of FIG. 1. FIG. 3 is an exploded perspective view of a main part of FIG. 1. FIG. 4 is a sectional view taken along line AA in FIG. FIG. 5 is a right side view showing how the mating bus bar is fastened to the bolt. FIG. 6 is a diagram corresponding to FIG. 4 showing a mode in which dimensional tolerances between the bus bar and the other bus bar are absorbed.

<Embodiment>
Hereinafter, a bus bar fixing structure 1 according to the present embodiment will be described with reference to the drawings. The bus bar fixing structure 1 is used, for example, to connect and fix bus bars to each other in a battery pack or the like.

Hereinafter, for convenience of explanation, "front", "rear", "left", "right", "upper", and "lower" will be defined as shown in FIGS. 1 to 6. The "front-back direction", the "left-right direction", and the "up-down direction" are orthogonal to each other. The front-rear direction corresponds to the "axial direction" of the present invention. The vertical direction corresponds to the "extending direction" of the present invention.

<Summary>
As shown in FIGS. 1 to 4, the busbar fixing structure 1 includes a busbar 10, a bolt 20, a nut 30, a leaf spring 40 (corresponding to the "elastic member" of the present invention), and a mating busbar 50 ( (corresponding to the "target member" of the present invention).

<Busbar 10>
The bus bar 10 will be explained with reference to FIG.

The bus bar 10 has a plate-shaped main body 11 that is thick in the front-rear direction and extends in the up-down direction. An elongated hole 12 is provided at the upper end of the main body 11, extending in the vertical direction and penetrating in the front-rear direction. The large diameter portion 23 of the bolt 20 is inserted into the hole 12 (see also FIGS. 1 to 2 and 4).

<Bolt 20>
The bolt 20 will be explained with reference to FIGS. 3 and 5.

The bolt 20 has a head 21 located at the front end (corresponding to "one axial end" of the present invention) and a screw located at the rear end (corresponding to "the other axial end" of the present invention). It integrally includes a section 22, a large diameter section 23 disposed between the head 21 and the threaded section 22, and a flange section 24 disposed between the head 21 and the large diameter section 23. .

A thread (not shown) is formed in the threaded portion 22, and a nut 30 is screwed into the threaded portion 22 as described later. The large diameter portion 23 has a columnar shape and is formed to have a larger diameter than the threaded portion 22 and the fastening hole 52 of the mating bus bar 50 . The flange portion 24 extends radially outward over the entire circumferential area of the bolt 20.

<Nut 30>
The nut 30 will be explained with reference to FIGS. 1 to 6.

The nut 30 is screwed onto the threaded portion 22 of the bolt 20 (see FIGS. 1-2 and 4-6). A known nut may be used as the nut 30, and is not particularly limited as long as it can be screwed onto the threaded portion 22.

<Plate spring 40>
The leaf spring 40 will be explained with reference to FIGS. 1 to 6.

The leaf spring 40 is configured to be elastically deformable and has an annular shape. As the leaf spring 40, a spring washer or the like is used, for example, and is not particularly limited as long as it can make elastic contact with the bus bar 10 so as to press the bus bar 10 against the other bus bar 50.

<Other side bus bar 50>
Referring to FIG. 3, the counterpart bus bar 50 will be described.

The mating bus bar 50 has a plate-shaped main body portion 51 that is thick in the front-rear direction and extends in the left-right direction. A fastening hole 52 penetrating in the front-rear direction is provided at the right end portion of the main body portion 51. The threaded portion 22 of the bolt 20 is inserted into the fastening hole 52 (see also FIGS. 1 to 2 and 4 to 5).

<Busbar fixing structure 1>
First, a method of fixing the bus bar 10 to the other bus bar 50 will be described. First, the plate spring 40 and the bus bar 10 are inserted in this order from the threaded portion 22 of the bolt 20 toward the large diameter portion 23. As a result, the large-diameter portion 23 is inserted into the hole (numerals omitted) of the leaf spring 40 and the hole 12 of the bus bar 10 (see FIGS. 1 to 2 and 4 to 5).

Then, the threaded portion 22 is inserted into the fastening hole 52 of the mating bus bar 50, and then the nut 30 is screwed onto the threaded portion 22. As a result, the threaded portion 22 is inserted into the fastening hole 52 of the mating bus bar 50, and the mating bus bar 50 is fastened to the large diameter portion 23 (see especially FIG. 5).

As the nut 30 is screwed onto the threaded portion 22, the leaf spring 40 is pressed by the flange portion 24 and elastically deforms, coming into elastic contact with the bus bar 10 so as to press the bus bar 10 against the mating bus bar 50. As a result, the bus bar 10 is fixed in a state in which it is pressed into contact with the other bus bar 50. That is, the bus bar 10 is fixed to the mating bus bar 50 by the elastic force of the leaf spring 40 (see FIGS. 1 to 2 and 4). As a result, a bus bar fixing structure 1 is obtained.

<Absorption of dimensional tolerance between bus bar 10 and mating bus bar 50>
With reference to FIGS. 4 and 6, absorption of dimensional tolerance between the bus bar 10 and the mating bus bar 50 in the bus bar fixing structure 1 will be described.

If there is no dimensional tolerance between the bus bar 10 and the mating bus bar 50, the large diameter portion 23 of the bolt 20 is inserted into the approximately central region of the hole 12 in the vertical direction (see FIG. 4). If a tolerance occurs, the large diameter portion 23 is inserted at a position warped from the substantially central region in the vertical direction of the hole 12 (see FIG. 6). That is, if a dimensional tolerance occurs between the bus bar 10 and the other bus bar 50, this dimensional tolerance is absorbed by the elongated hole 12.

<Action/Effect>
According to the bus bar fixing structure 1 according to the present embodiment, the hole 12 of the bus bar 10 is formed in the shape of a long hole extending in the vertical direction, which is the direction in which the bus bar 10 extends. Thereby, even if a dimensional tolerance occurs between the bus bar 10 and the counterpart bus bar 50, it can be absorbed by the hole 12. Further, according to the bus bar fixing structure 1 according to the present embodiment, the leaf spring 40 comes into elastic contact with the bus bar 10 so as to press the bus bar 10 against the other bus bar 50. That is, the bus bar 10 is fixed to the mating bus bar 50 by the elastic force of the leaf spring 40. For this reason, even if a dimensional tolerance occurs between the bus bar 10 and the mating bus bar 50, no stress is applied to the fixed location between the bus bar 10 and the mating bus bar 50. In this way, the busbar fixing structure 1 according to the present embodiment can absorb the dimensional tolerance between the busbar 10 and the mating bus bar 50, and even if a dimensional tolerance occurs, the bus bar 10 and the mating bus bar 50 can be fixed. The stress at the fixed points can be alleviated.

Further, according to the bus bar fixing structure 1 according to the present embodiment, the mating bus bar 50 is fastened to the large diameter portion 23 of the bolt 20 by screwing the nut 30 into the threaded portion 22 of the bolt 20. The plate spring 40 is configured to be elastically deformed by the screw engagement. Thereby, the mating bus bar 50 is held between the large diameter portion 23 and the nut 30, so the bus bar 10 can be fixed to the mating bus bar 50 more reliably.

Furthermore, according to the bus bar fixing structure 1 according to the present embodiment, the bus bar fixing structure 1 can be used for, for example, a battery pack or the like because the target member is the counterpart bus bar.

<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 bus bar fixing structure according to the present invention described above will be briefly summarized and listed below in [1] to [3].
[1]
a plate-shaped bus bar (10) having a hole (12); a bolt (20) inserted into the hole; an elastic member (plate spring 40) through which the bolt is inserted and which is elastically deformable; A busbar fixing structure (1) comprising a target member to which a busbar is fixed (a mating busbar 50),
The hole (12) is formed in a long hole shape extending in the extending direction of the bus bar (10),
The bus bar (10) is
disposed between the elastic member (plate spring 40) and the target member (the mating bus bar 50) in the axial direction of the bolt (20);
The fixed structure (1) of the bus bar is:
The elastic member (plate spring 40) comes into elastic contact with the bus bar (10) so as to press the bus bar (10) against the target member (other bus bar 50).
Bus bar fixing structure (1).
[2]
The bus bar fixing structure (1) according to [1] above,
further comprising a nut (30) threaded onto the bolt;
The bolt (20) is
a head (21) provided at one end in the axial direction;
a threaded portion (22) provided at the other end in the axial direction and into which the nut is screwed;
a large diameter portion (23) disposed between the head and the threaded portion in the axial direction and having a larger diameter than the threaded portion;
integrally comprising a flange portion (24) disposed between the head and the large diameter portion in the axial direction and extending in the radial direction of the bolt;
The bus bar (10) and the elastic member (plate spring 40) are arranged in the large diameter portion (23),
The elastic member (plate spring 40) is arranged between the flange portion (24) and the bus bar (10) in the axial direction,
The fixed structure (1) of the bus bar is:
By screwing the nut (30) into the threaded portion (22), the target member (the mating bus bar 50) is fastened to the large diameter portion (23),
The elastic member (plate spring 40) is configured to be elastically deformed by the screwing.
Bus bar fixing structure (1).
[3]
In the bus bar fixing structure (1) according to [1] or [2] above,
The target member (the other side bus bar 50) is a other side bus bar that is electrically connected to the bus bar (10).
Bus bar fixing structure (1).

According to the bus bar fixing structure having the configuration [1] above, the hole portion of the bus bar is formed in the shape of a long hole extending in the extending direction of the bus bar. Thereby, even if a dimensional tolerance occurs between the bus bar and the target member, it can be absorbed by the hole. Moreover, according to the bus bar fixing structure of this configuration, the elastic member comes into elastic contact with the bus bar so as to press the bus bar against the target member. That is, the bus bar is fixed to the target member by the elastic force of the elastic member. For this reason, even if a dimensional tolerance occurs between the bus bar and the target member, no stress is applied to the fixed location between the bus bar and the target member. In this way, the bus bar fixing structure of this configuration can absorb the dimensional tolerance between the bus bar and the target member, and even if a dimensional tolerance occurs, it can relieve the stress at the fixing location between the bus bar and the target member.

According to the bus bar fixing structure configured in [2] above, the target member is fastened to the large diameter portion of the bolt by screwing the nut into the threaded portion of the bolt, and this screwing also causes the elastic member to become elastic. Constructed to deform. Thereby, since the target member is held between the large diameter portion and the nut, the bus bar can be fixed to the target member more reliably.

According to the bus bar fixing structure configured in [3] above, the target member is the counterpart bus bar. Thereby, the bus bar fixing structure of this configuration can be used, for example, in a battery pack or the like.

1 Fixed structure 10 Bus bar 11 Main body part 12 Hole part 20 Bolt 21 Head part 22 Threaded part 23 Large diameter part 24 Flange part 30 Nut 40 Leaf spring (elastic member)
50 Opposite bus bar (target member)
51 Main body 52 Fastening hole

Claims (3)

A bus bar comprising: a plate-shaped bus bar having a hole; a bolt inserted into the hole; an elastic member into which the bolt is inserted and which is elastically deformable; and a target member to which the bus bar is fixed. A fixed structure,
The hole portion is formed in a long hole shape extending in the extending direction of the bus bar,
The bus bar is
disposed between the elastic member and the target member in the axial direction of the bolt,
The fixed structure of the bus bar is
the elastic member makes elastic contact with the bus bar so as to press the bus bar against the target member;
Bus bar fixed structure. The bus bar fixing structure according to claim 1,
further comprising a nut screwed onto the bolt,
The bolt is
a head provided at one end in the axial direction;
a threaded portion provided at the other end in the axial direction and into which the nut is screwed;
a large diameter portion disposed between the head and the threaded portion in the axial direction and having a larger diameter than the threaded portion;
integrally comprising a flange portion disposed between the head and the large diameter portion in the axial direction and extending in the radial direction of the bolt;
The bus bar and the elastic member are arranged in the large diameter portion,
The elastic member is disposed between the flange portion and the bus bar in the axial direction,
The fixed structure of the bus bar is
By screwing the nut into the threaded portion, the target member is fastened to the large diameter portion,
The elastic member is configured to be elastically deformed by the screwing.
Bus bar fixed structure. The bus bar fixing structure according to claim 1 or 2,
The target member is a counterpart bus bar that is electrically connected to the bus bar.
Bus bar fixed structure.

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