JP2013054945A - Fuse unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuse unit having the high degree of freedom in design of a fusible part.SOLUTION: A fuse unit 1 includes: a bus bar 11 having a power feeding connection 12, external connections 13 and fusible parts 15 interposed among them; and a unit body 10 having an insulation resin part 20 which is fixed to the outside of the bus bar 11 and has window parts 21 exposing the fusible parts 15 therefrom. The window part 21 exposes a fusible element 15b of the fusible part 15 therefrom and a portion of the fusible part 15 other than the fusible element (15b) is buried in the insulation resin part 20.

Description

  The present invention relates to a fuse unit that prevents an overcurrent from being applied to a load.

  A fuse unit is mounted on the vehicle to prevent overcurrent from being applied to the load from the power source. A conventional fuse unit of this type is disclosed in Patent Document 1. As shown in FIG. 8, the fuse unit 100 is fixed to a battery post (not shown) via a battery terminal (not shown). The fuse unit 100 includes a bus bar 101 which is a conductive metal plate, and an insulating resin portion 120 provided by insert molding using the bus bar 101 as an insert part.

  The bus bar 101 includes a power supply connection portion 102 to which a battery terminal (not shown) is connected, an external connection portion 103 to which each external terminal is connected, and a connection between the power supply connection portion 102 and each external connection portion 103. And a plurality of soluble portions 104 interposed therebetween. Each fusible portion 104 includes a bus bar narrow portion 104a in which a part of the bus bar 101 is narrow and formed in a bent shape, and a low melting point metal (for example, a crimped and fixed to the bus bar narrow portion 104a) Tin) soluble body 104b. Each soluble part 104 is melted by energization of the respective overcurrent.

  The insulating resin portion 120 substantially covers the outer surface of the bus bar 101 excluding the power supply connection portion 102, each external connection portion 103, and each soluble portion 104. The insulating resin portion 120 is provided with a window portion 121 that exposes each soluble portion 104. Each window part 121 is formed in a large size so as to expose the entire soluble part 104. Each window 121 is closed by each fusible part cover 130 attached to the insulating resin part 120. Each fusible part cover 130 is U-shaped and closes both openings of the window part 121 to protect the fusible part 104 from dust, water and the like. Each soluble part cover 130 is formed of a transparent body so that the presence or absence of melting of the soluble part 104 can be confirmed by visual observation. A backlash prevention structure is provided between each fusible portion cover 130 and the insulating resin portion 120.

JP 2010-95214 A

  However, in the conventional example, since it is necessary to perform insert molding so that the entire soluble portion 104 is exposed from the window portion 121 of the insulating resin portion 120, there is a problem that the degree of freedom in designing the soluble portion 104 is low.

  That is, when insert molding is performed using the same burr cutting piece, the hatched area in FIG. Therefore, the design space of the fusible portion 104 is ensured only in the range within the burr cutting die mating portion A2, and the degree of freedom in design is low.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a fuse unit having a high degree of freedom in designing a fusible portion.

  The present invention provides a bus bar having a plurality of terminal connection portions and a soluble portion interposed between the terminal connection portions, and an insulation having a window portion fixed to the outside of the bus bar and exposing the soluble portion. A fuse unit including a unit body having a resin portion, wherein the window portion exposes a soluble body of the soluble portion, and a portion of the soluble portion other than the soluble body is embedded in the insulating resin portion. It is characterized by.

  It is preferable that a cap that covers the outside of the unit main body is provided, and the cap has a window closing portion that closes the window portion.

  The cap has a cap body having a first window closing portion, and a second window closing portion connected to the cap body via a hinge portion, and the first window closing portion and the second window closing portion. It is preferable to close the openings on both sides of the window.

  According to the present invention, most of the fusible part is covered with the insulating resin part, and the place covered with the insulating resin part is the same when using the same insert mold, and can be freely designed without design restrictions. it can. Therefore, the design flexibility of the fusible part is high.

FIG. 2 is a perspective view showing an embodiment of the present invention before the fuse unit is assembled. 1A and 1B show an embodiment of the present invention, in which FIG. 1A is a plan view of a unit body, and FIG. 2B is a bottom view of the unit body. FIG. 3 is a plan view of a main part showing an area for entering a die-matching part for burr cutting during insert molding, showing an embodiment of the present invention. 1 is a perspective view of a cap according to an embodiment of the present invention viewed from the bottom side. FIG. 4 is a perspective view showing an embodiment of the present invention, in which a cap is assembled to a unit body, and a second window closing portion is in an open position. FIG. 5 is a perspective view from above showing the embodiment of the present invention, with the cap assembled to the unit body, and the second window closing part as the closing position. FIG. 6 is a perspective view from below showing the embodiment of the present invention, with the cap assembled to the unit body, and the second window closing part as the closing position. It is a top view of the fuse unit of a prior art example. It is a principal part top view which shows the area | region which inserts the die | dye matching part of the burr cutting at the time of insert molding of a prior art example.

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

  1 to 7 show an embodiment of the present invention. As shown in FIG. 1, the fuse unit 1 includes a unit body 10 and a cap 30. The unit main body 10 is bent in an L shape. With such a configuration, the unit main body 10 is disposed along the upper surface and side surfaces of a battery (not shown).

  As shown in detail in FIGS. 1 and 2A and 2B, the unit body 10 includes a bus bar 11 that is a conductive metal plate and an insulating resin portion 20 that is fixed to the outer surface of the bus bar 11. Yes. The bus bar 11 includes a power supply connection portion 12 that is a terminal connection portion, a plurality of external connection portions 13 and 14 that are terminal connection portions to which external terminals (not shown) are connected, and a power supply connection portion 12. A plurality of fusible portions 15 and 16 interposed between the external connection portions 13 and 14 respectively.

  The power supply connection portion 12 is connected to a battery post (not shown) of a battery (not shown) via a battery terminal (not shown). An external terminal (not shown) is connected to the external connection portion 13 by bolt connection. The external connection portion 14 has a tab shape. An external terminal (not shown) is connected to the external connection portion 14 by connector connection.

  The plurality of soluble portions 15 and 16 are provided on the upper surface and side surfaces of the bus bar 11. Each fusible portion 15 on the upper surface prevents an overcurrent to the external connection portion 13 for bolt connection. The fusible portion 16 on the side surface prevents an overcurrent to the external connection portion 14 for connector connection. Each fusible part 15, 16 includes a bus bar narrow part 15a, 16a in which a part of the bus bar 11 is formed narrow, and a low melting point metal (for example, tin) fixed to the bus bar narrow part 15a, 16a by caulking. ) Soluble bodies 15b and 16b. Each soluble part 15 and 16 is melted by energization of each overcurrent.

  The insulating resin portion 20 is formed of an insulating synthetic resin by insert molding using the bus bar 11 as an insert part. The insulating resin portion 20 substantially covers the outer surface of the bus bar 11 excluding the power supply connection portion 12, the external connection portions 13 and 14, and the soluble portions 15 and 16. The insulating resin portion 20 is provided with windows 21 and 22 for exposing the soluble portions 15 and 16 on the upper surface and the side surfaces, respectively. Each window portion 21 on the upper surface is formed with a small size so as to expose only the fusible bodies 15b and 16b. The portions of the fusible portion 15 other than the fusible bodies 15 b and 16 b, specifically, the bus bar narrow portions 15 a and 16 a are embedded in the insulating resin portion 20.

  As shown in detail in FIGS. 1 and 4, the cap 30 is made of an insulating and light-transmitting synthetic resin material. The cap 30 is attached to the unit main body 10 by sliding fitting from above. The cap 30 includes a cap body 31 and a second window closing portion 41 connected to the cap body 31 via a hinge portion 32. The cap body 31 covers not only the unit body 10 but also a battery terminal (not shown) and a battery post (not shown) from above. The cap body 31 has a fixed surface portion 31a and a lid portion 31c connected to the fixed surface portion 31a via a hinge portion 31b. By rotating the lid portion 31c in the opening direction from the closed position, the battery post (not shown), the battery terminal (not shown), the power feeding connection portion 12 and the like can be exposed. The lid portion 31c integrally includes a first window closing portion 40 at the left and right positions. In the closed position of the lid part 31 c, the first window closing part 40 closes the opening above the window part 21. A lock claw 34 a is provided on the side surface of the lid portion 31 c located on the opposite side of the hinge portion 32.

  The hinge portion 32 is provided along one side end of the lid portion 31c.

  The second window closing portion 41 can be shifted between the open position where the bottom surface of the lid portion 31c is opened and the closed position where the bottom surface of the lid portion 31c is closed with the hinge portion 32 as a fulcrum. A locked portion 34 b is provided at the rotation tip of the second window closing portion 41. In the closed position, the locked portion 34b and the lock claw 34a are engaged. At the closing position of the second closing part 41, the opening below each window part 21 on the upper surface is closed.

  Next, the assembly work of the unit main body 10 and the cap 30 will be described. As shown in FIG. 1, the cap 30 with the second window closing portion 41 in the open position is slid from above the unit body 10. Then, as shown in FIG. 5, the cap 30 is locked and fitted to the unit main body 10. Next, the second window closing portion 41 in the open position is rotated to the closing position, and the locked portion 34b is locked to the lock claw 34a. Thereby, as shown in FIG.6 and FIG.7, the 2nd window obstruction | occlusion part 41 is locked to the obstruction | occlusion position. In the closed position, both the upper and lower openings of the upper window portions 21 are closed by the first window closing portion 40 and the second window closing portion 41 of the cap body 31. Thus, the assembly of the unit main body 10 and the cap 30 is completed.

  As described above, the window portion 21 of the insulating resin portion 20 is formed to have a small size that exposes only the fusible members 15b and 16b of the fusible portions 15 and 16, and the soluble portions 15 and 16b other than the fusible members 15b and 16b. Sixteen locations are embedded in the insulating resin portion 20. Here, in the case of insert molding using the same burr cutting piece for the location of the fusible portion 15, the hatched area in FIG. 3 becomes the burr-cut mold aligning portion A 1, a location embedded in the insulating resin portion 20, Specifically, most of the bus bar narrow portion 15a can be freely designed without any design restrictions. The same applies to the soluble portion 16. Therefore, the design freedom of the soluble parts 15 and 16 is high.

  If the lengths L1 and L2 (shown in FIG. 3) of the portions that come into contact with the fusible portion 15 have the same dimensions, the burr cutting piece used for forming the insert is a portion other than the fusible body 15b (for example, a broken line portion in FIG. 3). The same bus bar 11 having different designs can be used.

  Moreover, the window parts 21 and 22 are small dimensions. Accordingly, since terminals and components do not enter the window portion 21, insulation from other circuits is improved. Further, it is possible to prevent an operator from mistakenly inserting a finger or the like into the window portion 21.

  The cap 30 includes a first window closing portion 40 and a second window closing portion 41 that close the window portion 21 of the insulating resin portion 20. Therefore, since the window part 21 which exposes the soluble part 15 is obstruct | occluded by the cap 30 which covers unit main body 10 itself, the soluble part cover like a prior art example is unnecessary. As described above, it is possible to completely prevent abnormal noise generated between the unit main body 10 and the fusible part cover as in the conventional example, and to reduce the number of parts.

  Since the window part 21 is obstruct | occluded with the cap 30, the soluble part 15 can be protected from dust, water, etc., and it can prevent that the melt | dissolved melted body (for example, tin) scatters.

  Since the cap 30 is formed of a light-transmitting member, the presence or absence of fusing of the fusible portion 15 can be visually recognized without opening the cap 30.

  The cap 30 includes a cap main body 31 having a first window closing portion 40 and a second window closing portion 41 connected to the cap main body 31 via a hinge portion 32. The window closing part 41 is configured to close the openings on both sides of the window part 21. Therefore, it is easy to assemble and remove the cap 30 from the unit main body 10.

  In this embodiment, the unit main body 10 is connected to a battery post of a battery via a connection terminal, but the present invention can also be applied to other types of unit main bodies.

DESCRIPTION OF SYMBOLS 1 Fuse unit 10 Unit main body 11 Bus bar 12 Power supply connection part (terminal connection part)
13, 14 External connection (terminal connection)
DESCRIPTION OF SYMBOLS 15,16 Soluble part 15b, 16b Soluble body 20 Insulating resin part 21,22 Window part 30 Cap 31 Cap main body 32 Hinge part 40 1st window obstruction | occlusion part (window obstruction | occlusion part)
41 Second window closing part (window closing part)

Claims (3)

A bus bar having a plurality of terminal connection portions and a soluble portion interposed between the terminal connection portions, and an insulating resin portion having a window portion fixed to the outside of the bus bar and exposing the soluble portion. A fuse unit having a unit body,
The fuse unit, wherein the window portion exposes a soluble body of the soluble portion, and a portion of the soluble portion other than the soluble body is embedded in the insulating resin portion. The fuse unit according to claim 1,
With a cap that covers the outside of the unit body,
The fuse unit, wherein the cap has a window closing portion that closes the window portion. The fuse unit according to claim 2,
The cap has a cap body having a first window closing portion, and a second window closing portion connected to the cap body via a hinge portion, and the first window closing portion and the second window closing portion. A fuse unit, wherein the openings on both sides of the window portion are closed.

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