JP6231850B2 - Fuse unit - Google Patents

Description

  The present invention relates to a fuse unit having a cover.

  For example, there is a fuse unit for mounting on a vehicle that is fixed to a battery via a battery terminal (see, for example, Patent Document 1). As shown in FIG. 7, the fuse unit 100 includes a fuse unit main body 101 and a cover 110 attached to the fuse unit main body 101. The fuse unit main body 101 includes a bus bar 102 that is a conductive metal plate, and an insulation protection portion 103 that is provided on the outer surface of the bus bar 102 by insert resin molding. A terminal portion 104 and a fusible portion 105 are formed on the bus bar 102.

  The cover 110 is disposed so as to cover the outer surfaces (mainly the upper surface) of the battery post 120a of the battery 120, the battery terminal 121, the terminal portion 104 of the fuse unit body 101, and the like. The cover 110 ensures insulation during energization in the battery post 120a, the battery terminal 121, the terminal portion 104 of the fuse unit main body 101, and the like.

  FIG. 8 shows a conventional example of the mounting structure of the cover 110. As shown in FIG. 8, a pair of main body side locking portions 106 are provided on both side walls of the insulation protection portion 103 of the fuse unit main body 101. A pair of cover side locking portions 112 is provided on both side walls 111 of the cover 110.

  As shown in FIG. 9, the cover 110 is moved downward so as to cover the fuse unit main body 101 from above. Then, the cover side locking part 112 and the main body side locking part 106 abut. When moving further downward from this state, the both side walls 111 of the cover 110 are bent and deformed in the direction in which they swell outward, and the cover side locking portion 112 gets over the main body side locking portion 106. When completely overriding, both side walls 111 of the cover 110 bend and return and the cover side locking portion 112 is locked to the main body side locking portion 106 (see FIG. 8B). Thus, the cover 110 is attached to the fuse unit main body 101.

  According to this conventional example, the cover 110 can be mounted on the fuse unit main body 101 by a simple mounting operation.

JP 2002-289171 A

  However, in the conventional example, since the pair of cover side latching portions 112 are provided on the both side walls 111 of the cover 110, the arrangement position (for example, the distance dimension) of the pair of cover side latching portions 112 is not limited to the deformation of the side wall 111. The displacement is easily caused by an assembly error between the fuse unit main body 101 and the cover 110. For this reason, a clearance d (shown in FIG. 8B) may occur between the cover side locking portion 112 and the main body side locking portion 106. If there is a clearance d between the cover-side locking portion 112 and the main-body-side locking portion 106, there is a problem of rattling due to vehicle vibrations, which causes member scraping, abnormal noise, and the like.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fuse unit in which the cover can be easily attached and the cover is not loose with respect to the fuse unit main body. .

The present invention includes a fuse unit main body having a fusible part and having a pair of main body side locking parts, and a pair of covers that cover the outer surface of the fuse unit main body and are locked by the pair of main body side locking parts. A pair of the cover-side locking portions, which are disposed on the inner sides of both side walls of the cover, are formed so as to be able to be bent and deformed, and the pair of covers In the locked state to the pair of main body side locking portions, the side locking portions are respectively in a state in which a bending return force is applied in the outward direction toward the side walls positioned on the outer side, or on the outer sides, respectively. It is a fuse unit that is locked in a state in which a bending return force is applied in an inner direction that is opposite to each side wall that is positioned .

  The pair of cover-side locking portions are formed in a rounded shape together with a root portion inside each cover-side locking portion and each corner portion of the fuse unit main body facing the same, and This includes one in which the radius of curvature of each corner of the fuse unit main body is set smaller than the radius of curvature of the rounded portion of the base portion of the cover side locking portion.

  According to the present invention, when the cover is placed on the outer surface of the fuse unit main body, the cover side locking portion is bent and deformed and locked to the main body side locking portion, so that the cover mounting operation is easy. In addition, since the position of the pair of cover side locking portions (for example, the distance between the cover) is disposed at the inner side of the both side walls of the cover, it may be caused by deformation of the side wall of the cover or an assembly error between the fuse unit body and the cover. Does not change easily. Accordingly, since the pair of cover side locking portions are securely locked to the main body side locking portion, for example, in a state where both outward outward bending return forces are applied, the cover side locking portion and the main body side locking portion In addition, no clearance is generated, and after the cover is mounted, the bending return force of the pair of cover side locking portions acts as a holding force of the cover with respect to the fuse unit main body. From the above, it is easy to attach the cover, and the cover does not play against the fuse unit body.

1 is an exploded perspective view of a fuse unit according to an embodiment of the present invention. 1 is a front view of a fuse unit according to an embodiment of the present invention. 1A and 1B show an embodiment of the present invention, in which FIG. 1A is a plan view of a fuse unit main body, and FIG. 1A and 1B show an embodiment of the present invention, in which FIG. 1A is a front view of the cover, FIG. 2B is a back view of the cover, and FIG. FIG. 3A is a cross-sectional view of a main part showing a state before the cover side locking portion interferes with the main body side locking portion in the process of mounting the cover to the fuse unit main body, FIG. ) Is a process of attaching the cover to the fuse unit body, and a cross-sectional view of the main part showing a state in which the cover side locking part interferes with the body side locking part, and (c) is a process of mounting the cover to the fuse unit body. It is principal part sectional drawing which shows the state which the cover side latching | locking part latched to the main body side latching | locking part. (A) is principal part sectional drawing which shows the clearance gap between the fuse unit main body and cover of this embodiment, (b) is principal part sectional drawing which shows the clearance gap between the fuse unit main body and cover of a comparative example. It is a disassembled perspective view of a fuse unit showing a conventional example. A prior art example is shown, (a) is a front view of a fuse unit, (b) is a sectional view taken along the line DD of (a). It is a front view which shows a prior art example and shows the state which covers a fuse unit main body.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 to 5 show an embodiment of the present invention. As shown in FIGS. 1 to 4, the fuse unit 1 is directly attached to a vehicle battery (not shown). The fuse unit 1 includes a fuse unit main body 2 and a cover 10 disposed so as to cover the upper surface (outer surface) of the fuse unit main body 2.

  The fuse unit main body 2 has a shape bent in an approximate L shape, and includes a bus bar 20 and an insulating protection portion 31 that covers an appropriate position of the bus bar 20. On the upper surface side of the bus bar 20, the power supply connection portion 21, the plurality of external connection portions 22, and the power supply connection portion 21 are interposed between the one external connection portion 22 and connected to the external connection portion 22. A fusible portion 23 is provided to block current. The power supply connecting portion 21 is connected to a battery post (not shown) via a connection terminal (not shown). Thereby, the fuse unit 1 is fixed directly to the battery. Each external connection portion 22 is provided with a bolt 25. The bolt 25 is fixed by having its head embedded in the insulation protection part 31. On the side of the bus bar 30, another fusible part 24 for preventing overcurrent to other external connection parts (not shown) and an external connection part (not shown) for connector connection are provided. Yes.

  The cover 10 is made of, for example, a polypropylene resin material. The cover 10 covers the fuse unit main body 2, the battery terminal (not shown), and the battery post (not shown). When the cover 10 is attached to the fuse unit main body 2, not only the power supply connection portion 21 and the external connection portion 22 are provided. Insulation is ensured when a battery terminal (not shown) and a battery post (not shown) are energized.

  The cover 10 includes a fixed cover portion 11 attached to the fuse unit main body 2 and a movable cover portion 13 connected to the fixed cover portion 11 via a hinge portion 12. The fixed cover portion 11 has an upper surface wall 11a and a side wall 11b extending downward from the peripheral edge thereof. The fixed cover portion 11 covers the upper portions of the two external connection portions 22 of the fuse unit body 2. The movable cover portion 13 is provided so as to be swingable with respect to the fixed cover portion 11 by a hinge portion 12. The movable cover 13 in the closed position covers a battery terminal (not shown) and a battery post (not shown) from above. By setting the movable cover portion 13 to the open position, the battery terminal (not shown) and the battery post (not shown) can be exposed.

  Next, the mounting structure of the cover 10 to the fuse unit main body 2 will be described. As shown in detail in FIG. 3B, the insulation protection portion 31 of the fuse unit main body 2 is integrally provided with a pair of main body side locking portions 32 each having a locking hole 32a. The pair of main body side locking portions 32 protrudes upward from the left and right side end surfaces. A space 33 into which a cover side locking portion 15 described below enters is formed between each main body side locking portion 32 protruding upward and the side end surface of the insulating protection portion 31.

  As shown in detail in FIGS. 4B and 4C, a pair of cover-side locking portions disposed on the inner surfaces of the both side walls 11 b on the upper surface wall 11 a of the fixed cover portion 11 so as to be deformable. 15 is provided. Each cover side latching part 15 has the elongate plate-shaped arm part 15a and the latching claw 15b provided in the front-end | tip of this arm part 15a. The pair of locking claws 15b protrude from the outer surface of the arm portion 15a. That is, both project toward the outside of the cover 10 with reference to the arrangement position of each cover-side locking portion 15.

  Further, the base portion of the arm portion 15 a of each cover side locking portion 15 is formed as a round shape portion 16. When the cover 10 is mounted on the fuse unit main body 2, the corner portion of the insulation protection portion 31 of the fuse unit main body 2 facing the round shape portion 16 is also formed as the round shape portion 34. When the radius of curvature of the round shape portion 16 of the cover side locking portion 15 is R1, and the radius of curvature of the round shape portion 34 of the fuse unit body 2 is R2, R1 <R2.

  Next, the mounting operation of the cover 10 to the fuse unit main body 2 will be described. As shown in FIG. 5A, the cover 10 is moved downward so as to cover the fuse unit main body 2 from above. Then, first, the locking claws 15b of the cover side locking portions 15 and the main body side locking portions 32 abut each other. When moving further downward from this state, as shown in FIG. 5 (b), the arm portions 15a of the pair of cover side locking portions 15 are respectively bent and deformed inward (in the direction of arrow a in FIG. 5 (b)). The locking claw 15 b of the cover side locking portion 15 slides on the inner surface of the main body side locking portion 32. When the locking claw 15b of the cover side locking portion 15 moves to the position of the locking hole 32a of the main body side locking portion 32, the arm portion 15a of the cover side locking portion 15 is moved as shown in FIG. The deformation is caused in the return direction of bending, and the locking claw 15b of the cover side locking portion 15 enters the locking hole 32a of the body side locking portion 32 and is locked. Here, the latching claws 15b of the pair of cover side latching portions 15 are latched in a state in which the outward bending return force F is applied. Thus, the cover 10 is attached to the fuse unit main body 2.

  As described above, when the cover 10 is put on the outer surface of the fuse unit main body 2, the cover side locking portion 15 is bent and deformed and locked to the main body side locking portion 32. It is. Further, the arrangement position (for example, the distance dimension) of the pair of cover side locking portions 15 does not easily change due to deformation of the side wall 11b of the cover 10, an assembly error between the fuse unit main body 2 and the cover 10, or the like. Accordingly, since the pair of cover side locking portions 15 are locked to the main body side locking portion 32 in a state where the outward bending return force F is applied, the cover side locking portion 15 and the main body side locking portion 15 are locked. No clearance is generated between the portions 32, and the bending return force F of the pair of cover side locking portions 15 acts as a holding force of the cover 10 on the fuse unit body 2 after the cover 10 is mounted. As described above, the mounting operation of the cover 10 is easy, and the cover 10 is not loose with respect to the fuse unit body 2.

  When the radius of curvature of the round shape portion 16 of the cover side locking portion 15 is R1, and the radius of curvature of the round shape portion 34 of the fuse unit body 2 is R2, R1 <R2. FIG. 6A shows a case where R1 <R2, and FIG. 6B shows a case where R1> R2 as a comparative example. As apparent from FIGS. 1A and 1B, the gap d1 between the inner surface of the cover 10 and the outer surface of the fuse unit main body 2 can be reduced when R1 <R2, and the fuse unit 1 can be downsized. Can do.

  In this embodiment, the pair of cover-side locking portions 15 are locked to the main-body-side locking portion 32 in a state where an outward bending return force F is applied. On the contrary, the pair of cover side locking portions 15 may be locked to the main body side locking portion 32 in a state where the inward bending return force F is applied.

  In this embodiment, the fuse unit is directly attached to the battery, but the present invention is applicable to any fuse unit having a cover.

DESCRIPTION OF SYMBOLS 1 Fuse unit 2 Fuse unit main body 10 Cover 11b Side wall 15 Cover side latching | locking part 16,34 R-shaped part 23,24 Soluble part 32 Main body side latching part

Claims (2)

A fuse unit main body having a fusible part and having a pair of main body side locking parts, and a pair of cover side locking parts covering the outer surface of the fuse unit main body and locked to the pair of main body side locking parts A fuse unit comprising a cover having
The pair of cover-side locking portions are arranged on the inner sides of both side walls of the cover, and are formed to be able to bend and deform,
The pair of cover-side locking portions are in a state in which a return force is applied in the outward direction toward the side walls positioned on the outer side in the locked state to the pair of body-side locking portions , or The fuse unit is locked in a state in which a bending return force is applied in an inner direction which is opposite to the side walls located on the outer sides . The fuse unit according to claim 1,
The pair of cover-side locking portions are formed in a rounded shape together with a root portion inside each cover-side locking portion and each corner portion of the fuse unit main body facing the same, and A fuse unit, wherein a radius of curvature of each corner of the fuse unit main body is set to be smaller than a radius of curvature of a round-shaped portion of the base portion of the cover side locking portion.

Images