Fuse device

Abstract

To provide a fuse device which can improve its quality by reducing stress applied to a fusible part.SOLUTION: A fuse device 1 comprises: two connection terminal parts 2; a fusible part 3 which is provided between the two connection terminal parts 2; and two connection parts 4 which connect the connection terminal parts 2 to the fusible part 3. The connection parts 4 have a bead part 5 which is formed by folding a plate-like body upward or downward so that its surface may protrude. The bead part 5 can suppress transmission of stress from the connection terminal parts 2 sides to the fusible part 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fuse device. [Background technology]

[0002] Conventionally, a known fuse device has a fusible element provided between a terminal portion and a busbar portion, as described in Patent Document 1. This fuse device connects the fusible element to the terminal portion and the busbar portion with a curved linear member, thereby reducing stress concentration on the fusible element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-088235 Summary of the Invention [Problem to be solved by the invention]

[0004] The fuse device described above has room for improvement in that it may not be possible to sufficiently reduce stress concentration on the fusible element. That is, even if the linear member connected to the fusible element is bent, there is a concern that stress may be transmitted to the fusible element through the linear member due to twisting or bending of the terminals, etc.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a fuse device that can reduce the stress applied to the fusible portion and improve quality. [Means for solving the problem]

[0006] That is, the fuse device of the present invention comprises two connection terminal portions, a fusible portion provided between the two connection terminal portions, and two connection portions connecting the connection terminal portions and the fusible portion, and the connection portions are configured to have bead portions with protruding surfaces. [Effects of the Invention]

[0007] According to the fuse device of the present invention, the stress applied to the fusible portion can be reduced, thereby improving the quality. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a fuse device according to an embodiment. [Figure 2] FIG. 2 is an explanatory diagram of the stress reducing function of the fuse device according to the embodiment. [Figure 3] FIG. 3 is an explanatory diagram of a modified example of the fuse device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these embodiments. Furthermore, the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially the same.

[0010] [Embodiment] This embodiment relates to a fuse device. In the following description, of the first, second, and third directions that intersect with one another, the first direction is referred to as the "separation direction X," the second direction is referred to as the "width direction Y," and the third direction is referred to as the "thickness direction Z." Here, the separation direction X, the width direction Y, and the thickness direction Z are perpendicular to one another. The separation direction X corresponds to the direction in which two connection terminal portions are separated. The width direction Y and the thickness direction Z intersect with the separation direction X. Furthermore, unless otherwise specified, each direction used in the following description represents the direction in which each portion is assembled to each other. Note that the term "orthogonal" used here includes "approximately orthogonal."

[0011] 1, fuse device 1 is a device that protects circuit components against overcurrent and cuts off the current when a current greater than a predetermined level flows. Fuse device 1 includes a connection terminal portion 2, a fusible portion 3, and a connection portion 4.

[0012] The connection terminal portion 2 is a terminal that electrically connects the fuse device 1 to the outside, and is formed, for example, of a conductive plate. Two connection terminal portions 2 are provided spaced apart in the separation direction X. A fusible portion 3 is provided between the two connection terminal portions 2. The fusible portion 3 is connected to the connection terminal portion 2 by a connection portion 4. In other words, the connection portion 4 is connected to each of the two connection terminal portions 2, and the fusible portion 3 is provided between the two connection portions 4.

[0013] The connection part 4 is made of a conductive material, and is made of, for example, the same material as the connection terminal part 2. The connection part 4 is bent to connect between the connection terminal part 2 and the fusible part 3. By bending and connecting the connection terminal part 2 and the fusible part 3, the connection part 4 suppresses the transmission of stress to the fusible part 3 through the connection terminal part 2 and the connection part 4.

[0014] The connection portion 4 is configured by, for example, a first connection portion 41, a second connection portion 42, and a third connection portion 43 connected in series. The first connection portion 41 has one end connected to the connection terminal portion 2, extends along the width direction Y, and is connected at its other end to the second connection portion 42. The second connection portion 42 extends from its connection with the first connection portion 41 along the separation direction X and is connected at its other end to the third connection portion 43. The third connection portion 43 extends in the width direction Y from its connection with the second connection portion 42 and is connected to the fusible portion 3. In other words, the connection portion 4 is arranged in the width direction Y with the first connection portion 41 and the third connection portion 43 spaced apart, and the second connection portion 42 is formed between the first connection portion 41 and the third connection portion 43. By making the connection portion 4 bent in this way, even if stress is applied from the connection terminal portion 2 side, the connection portion 4 deforms, thereby suppressing the transmission of the stress to the fusible portion 3.

[0015] The second connection portion 42 is formed of a plate-like body extending along the separation direction X. A bead portion 5 is formed in the second connection portion 42. The bead portion 5 is a portion that is less likely to deform and has high rigidity compared to other portions of the connection portion 4, and is formed to protrude in the thickness direction Z. The bead portion 5 is formed, for example, by folding a plate body in a mountain shape so that it protrudes in the thickness direction Z. In other words, the bead portion 5 is formed to protrude in an inverted V shape toward the thickness direction Z. This makes the bead portion 5 less likely to deform even when stress is applied from the connection terminal portion 2 to the connection portion 4, and suppresses the stress from being transmitted to the fusible portion 3. Note that the bead portion 5 may also be formed by folding a plate body in a valley shape so that it protrudes in the thickness direction Z, and thus protrudes in a V shape toward the thickness direction Z.

[0016] The bead portion 5 can be easily formed by folding it in a mountain or valley so that it protrudes in the thickness direction Z. In other words, the fuse device 1 having the bead portion 5 can be manufactured easily and at low cost. For example, the fuse device 1 can be formed by pressing the connection terminal portion 2, the connection portion 4, and the bead portion 5 from a single plate, and can be manufactured easily and at low cost.

[0017] The two connection parts 4 are provided on either side of the fusible part 3, and are bent in an S shape with the fusible part 3 in between. This makes it possible to prevent stress from being transmitted to the fusible part 3 even if stress is applied to the connection terminal part 2 from the outside and the connection terminal part 2 is pulled or bent.

[0018] Furthermore, the connection portion 4 has a first connection portion 41 and a third connection portion 43 arranged in the width direction Y, and the fusible portion 3 is provided adjacent to the third connection portion 43. This makes it difficult for stress from the connection terminal portion 2 to be transmitted to the fusible portion 3, thereby ensuring proper protection of the fusible portion 3. In other words, even if the connection terminal portion 2 is pulled or pressed in the separation direction X, the structure makes it difficult for stress to be applied to the fusible portion 3, thereby suppressing any effects on the fusible portion 3.

[0019] The fusible portion 3 is a portion that melts when an overcurrent flows, for example, when a current greater than or equal to a predetermined value flows through it, thereby interrupting a circuit including the fuse device 1. The fusible portion 3 is made of, for example, a metal that melts when a current greater than or equal to a predetermined value flows through it. While FIG. 1 shows the case where the fusible portion 3 is formed in a cylindrical shape, the fusible portion 3 may have a shape other than a cylindrical shape as long as it melts when a current greater than or equal to a predetermined value flows through it.

[0020] Next, the stress suppression function of the fuse device 1 according to this embodiment will be described.

[0021] The fuse device 1 is used, for example, as a component of a power supply circuit of a vehicle, and is installed by being connected to a bus bar 10. The bus bar 10 is connected to a connection terminal portion 2 of the fuse device 1. For example, the connection terminal portion 2 is connected to the bus bar 10 by fastening with a bolt or the like. At this time, movement of the connection terminal portion 2 may apply stress to the connection portion 4, but the formation of the bead portion 5 prevents the application of stress to the fusible portion 3.

[0022] For example, when the connection terminal portion 2 is pulled or pressed in the separation direction X, the first connection portion 41 moves closer to or away from the connection terminal portion 2, but the bead portion 5 is hardly deformed, thereby preventing stress from being applied to the third connection portion 43 and the fusible portion 3. Furthermore, when the orientation or posture of the connection terminal portion 2 is changed, the first connection portion 41 deforms, but the bead portion 5 is hardly deformed, thereby preventing stress from being applied to the third connection portion 43 and the fusible portion 3. In this way, stress is prevented from being applied to the fusible portion 3 when the fuse device 1 is installed or used, preventing impairment of the fusing function or interruption function of the fusible portion 3.

[0023] As described above, the fuse device 1 according to this embodiment can suppress the application of stress to the fusible portion 3 by forming the bead portion 5 on the connection portion 4. Therefore, the fuse device 1 according to this embodiment can ensure the melting function of the fusible portion 3 and can improve quality.

[0024] Furthermore, in the fuse device 1 according to this embodiment, the bead portion 5 is formed by folding the plate-shaped body in a mountain or valley shape, so that the bead portion 5 can be easily formed.

[0025] Furthermore, in the fuse device 1 of this embodiment, the two connection portions 4 are formed by bending them into an S shape with the fusible portion 3 in between, so that even if stress is applied to the connection terminal portion 2, the stress can be prevented from being transmitted to the fusible portion 3.

[0026] The fuse device according to the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the claims. The fuse device 1 according to this embodiment may be configured by appropriately combining the components of the above-described embodiments and modifications.

[0027] For example, in the above-described embodiment, the first connecting portion 41 and the third connecting portion 43 of the connecting portion 4 are arranged in the width direction Y. However, the first connecting portion 41 and the third connecting portion 43 may be arranged in the separation direction X. That is, as shown in FIG. 3 , the fuse device 1A includes a connection terminal portion 2, a fusible portion 3, a connecting portion 4, and a bead portion 5, similar to the above-described fuse device 1, but the first connecting portion 41 and the third connecting portion 43 are arranged in the separation direction X. This fuse device 1A can also achieve the same effects as the above-described fuse device 1. That is, by forming the bead portion 5 on the connecting portion 4, the fuse device 1A can suppress the application of stress to the fusible portion 3, ensure the melting function of the fusible portion 3, and improve quality. Furthermore, the fuse device 1A has the bead portion 5 formed by mountain-folding or valley-folding a plate-like body, which allows the bead portion 5 to be easily formed by press processing. Furthermore, the fuse device 1A has two connection portions 4 bent in an S shape with the fusible portion 3 sandwiched between them, thereby preventing stress from being transmitted to the fusible portion 3 even if stress is applied to the connection terminal portion 2.

[0028] Furthermore, in the above-described embodiment, the fuse device 1 has been described as having a bead portion 5 formed by mountain or valley folding of a plate-like body. However, the bead portion 5 may have a shape other than a mountain or valley fold as long as it protrudes from the surface in the thickness direction Z and has higher rigidity than other portions. For example, the bead portion 5 may have a shape formed by bending the end of the second connection portion 42 in the thickness direction Z. Even in this case, the same effects as those of the above-described embodiment can be obtained. That is, even in such a fuse device, forming the bead portion 5 on the connection portion 4 can suppress stress from being applied to the fusible portion 3, thereby ensuring the fusing function of the fusible portion 3 and improving quality. Furthermore, in such a fuse device, since the bead portion 5 is formed by mountain or valley folding of a plate-like body, the bead portion 5 can be easily formed by press processing. Furthermore, in such a fuse device, since the two connection portions 4 are bent in an S-shape with the fusible portion 3 sandwiched therebetween, stress applied to the connection terminal portion 2 can be suppressed from being transmitted to the fusible portion 3.

[0029] Furthermore, in the above-described embodiment, the fuse device 1 is described as being used in a power supply circuit of a vehicle, but the fuse device according to the present invention may be used in a circuit other than a power supply circuit of a vehicle. [Explanation of symbols]

[0030] 1: Fuse device 2: Connection terminal 3: Soluble part 4: Connection part 5: Bead section

Claims

1. Two connection terminals; a fusible portion provided between the two connection terminal portions; two connection portions that connect the connection terminal portion and the fusible portion, The connection portion has a bead portion protruding from its surface. Fuse device.

2. The bead portion is formed by folding a plate-like body in a mountain or valley direction. The fuse device of claim 1 .

3. The two connecting portions are bent in an S shape with the fusible portion sandwiched therebetween.

3. The fuse device according to claim 1 or 2.

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