JP5308908B2 - Fuse unit - Google Patents

Description

  The present invention relates to a fuse unit, and more particularly to a fuse unit that is used by being bent at a predetermined angle at a hinge portion.

  FIG. 8 is a diagram showing a schematic configuration of a conventional electrical junction box 200.

  The electrical junction box 200 includes a plurality of bus bars 204 and two fusible links 206 and 208 connected to the bus body 204 on the case main body 202, and the case main body 202 is coupled by covering the upper cover 210 and the lower cover 212 with a battery. It is mounted on the box (see, for example, Patent Document 1).

  The state in which the upper cover 210 and the lower cover 212 are attached to the case main body 202 will be described. The upper cover 210 is covered on the upper surface of the case main body, and the lock portion 214 of the upper cover 210 and the locked portion of the lower cover 212 are locked. Match. At this time, the inner surface of the entire peripheral wall 216 of the upper cover 210 is in contact with the outer surface of the entire peripheral wall 218 of the lower cover 212.

Japanese Patent Laid-Open No. 2006-74888

  By the way, in the structure of the conventional electrical junction box 200, since the lock part and the to-be-locked part are comprised with resin and resin is latched, when the kind of resin is changed according to a specification change, a lock | rock is carried out. There exists a problem that there exists a possibility that intensity | strength may fall. Moreover, since the lock | rock part and a to-be-locked part exist in the outer surface of an electrical junction box, there exists a problem that the external shape of an electrical junction box becomes large. Furthermore, since the lock part and the locked part are present on the outer surface of the electrical junction box, the lock part (locking part) and the locked part (locked part) may be damaged by an impact received from the outside. There is a problem that there is.

  These problems also occur in a fuse unit having a locking part and a locked part for bending the hinge part to a target angle and keeping the target bending angle constant.

  The present invention has been made in view of the above problems, and in a fuse unit that is used while being bent to a target bending angle at a hinge portion and maintaining the target angle, a resin body constituting the fuse unit Even if the type of the change is changed, the lock strength at the target angle can be maintained, the outer shape can be prevented from becoming large, and the locking portion or the like can be prevented by an impact received from the outside. It is an object of the present invention to provide a fuse unit capable of avoiding as much as possible the possibility that the locked portion is damaged.

  According to the first aspect of the present invention, there is provided a bus bar including a hinge portion provided at an intermediate portion and a through hole provided on one side with the hinge portion interposed therebetween, and the hinge portion is exposed and the penetrating hole is provided. A first resin body that covers a predetermined region on one side of the bus bar with the hinge portion in between so that a hole penetrates, and the hinge portion is exposed so that the hinge portion is exposed. A second resin body that covers a predetermined region on the other side of the bus bar, and a material that is higher in rigidity than the resin material that constitutes the first resin body, and is formed in the through hole. When the bus bar is bent at a predetermined angle at the hinge portion, the locking piece integrally provided on the first resin body and the second resin body are integrally provided so as to protrude. And engaging the locking piece, A fuse unit and a target engaging piece for fixing the degrees.

  The invention according to claim 2 is the fuse unit according to claim 1, wherein the locking piece is insulated from a circuit of the fuse unit.

  According to a third aspect of the present invention, in the fuse unit according to the first or second aspect, the locking piece is a fuse unit configured separately from the fuse unit.

  According to the present invention, in the fuse unit that is used to bend to the target bending angle at the hinge portion and maintain the target angle, the type of the resin body constituting the fuse unit is changed. However, the lock strength at the target angle can be maintained, the outer shape can be prevented from becoming large, and the locking portion and the locked portion can be damaged as much as possible by an impact received from the outside. There is an effect that it can be avoided.

It is a figure which shows schematic structure of the fuse unit which concerns on embodiment of this invention. It is a figure which shows the II-II cross section in FIG. 1, Comprising: It is a figure which shows the periphery of a through-hole. It is a figure which shows the III-III cross section in FIG. It is IV arrow line view in FIG. It is a figure which shows the modification of a locking piece, and is a figure corresponding to FIG. It is a figure which shows the modification of a locking piece, and is a figure corresponding to FIG. It is a figure which shows the modification of a locking piece, and is a figure corresponding to FIG. It is a figure which shows schematic structure of the conventional electrical junction box.

  FIG. 1 is a diagram showing a schematic configuration of a fuse unit 1 according to an embodiment of the present invention, and FIG. 2 is a diagram showing a II-II cross section in FIG. FIG. 3 is a diagram showing a cross section taken along line III-III in FIG. 1, and FIG. 4 is a view taken along arrow IV in FIG.

  The fuse unit 1 is used while being bent at a target bending angle at the hinge portion 9 and maintaining (fixing) the target angle. For example, the fuse unit 1 is connected to a battery terminal of an automobile or the like and is close to the battery terminal. It is installed and used.

  The fuse unit 1 includes a bus bar 3, a resin body 5, and a resin body 7.

  A hinge portion 9 is provided at an intermediate portion of the bus bar 3, and a through hole 11 is provided at one side portion (one portion) of the bus bar 3 with the hinge portion 9 therebetween.

  The bus bar 3 is made of, for example, a material having conductivity such as metal, and is formed by pressing a metal plate-like material. The bus bar 3 can be bent at the hinge portion 9. The bus bar 3 is bent by bending the bus bar 3 in the thickness direction at a straight bend line in the hinge portion 9. The through hole 11 penetrates the bus bar 3 in the thickness direction of the bus bar 3. Further, the bus bar 3 is provided with connecting portions 13, 15, 17, 19 and fusible portions (fuse elements) 21 for connecting to battery terminals and the like.

  The resin body 5 is made of a resin material having an insulating property, and the hinge portion 9 is exposed and the through hole 11 penetrates, so that one side of the bus bar 3 with the hinge portion 9 in between (one side) Part). The resin body 5 covers a predetermined region of one part of the bus bar 3.

  A starter motor connection part (starter motor connection through hole) 17, a device connection part (connection part to the device; a device connection through hole) 19 and a fusible part 21 are provided in one part of the bus bar 3. In some cases, the resin body 5 is provided so that these portions and their periphery are exposed.

  Further, since the resin body 5 is provided so that the through hole 11 of the bus bar 3 penetrates, when the bus bar 3 provided with the resin body 5 is viewed from the thickness direction of the bus bar 3, the bus bar 3 penetrates. For example, a rectangular through hole (a through hole provided in the resin body 5) 23 is provided at the hole 11 (for example, inside the rectangular through hole 11).

  The shape and size of the through hole 11 of the bus bar 3 and the shape and size of the through hole 23 in the resin body 5 may be the same. In this case, when viewed from the thickness direction of the bus bar 3, the penetration of the bus bar 3 The hole 11 can be seen as it is. That is, the through hole 23 is formed in the resin body 5 in a manner in which the through hole 11 of the bus bar 3 is moved in the thickness direction of the bus bar 3.

  Further, the thickness of the resin body 5 is increased at the through hole 23. That is, the cylindrical rib 25 (see FIG. 3) is erected on the main body of the resin body 5, so that the inner wall of the cylindrical rib 25 forms the through hole 23 of the resin body 5, and the resin The depth of the through hole 23 of the body 5 is increased.

  The resin body 7 is also made of an insulating resin material, and is integrally formed on the other side (the other portion) of the bus bar 3 with the hinge portion 9 therebetween so that the hinge portion 9 is exposed. Is provided. The resin body 7 is away from the resin body 5 and covers a predetermined region of the other part of the bus bar 3.

  In the case where a battery connection part (battery connection through hole) 13, an alternator connection part (alternator connection through hole) 15 or a soluble part (not shown) is provided in the other part of the bus bar 3. The resin body 7 is provided so that these parts and their periphery are exposed.

  The resin bodies 5 and 7 are provided on the flat bus bar 3 which is not bent at the hinge portion 9 by insert molding. Thereby, installation to the bus-bar 3 of the resin bodies 5 and 7 becomes easy. In a state in which the resin bodies 5 and 7 are installed and the hinge portion 9 is not bent, the fuse unit 1 is almost provided with the resin bodies 5 and 7 at predetermined portions on both sides in the thickness direction of the bus bar 3. It is formed in a flat shape.

  The fuse unit 1 is provided with a locking piece 27 and a locked piece 29. The locking piece 27 is made of a material that is higher in rigidity than the resin material constituting the resin bodies 5 and 7 (a material having a high elastic modulus and a strength that can withstand breakage and is less likely to cause a creep phenomenon; for example, a metal material). It protrudes into the through hole 23 and is provided integrally with the resin body 5. That is, the locking piece 27 protrudes from the inner wall of the through hole 23 of the resin body 5 toward the center of the through hole 23. The locking piece 27 does not protrude to the outside of the through hole 23 but stops inside the through hole 23.

  The locked piece 29 is provided integrally with the resin body 7 (for example, integrally formed with the resin body 7), and the bus bar 3 is held at a predetermined angle (target angle) by the hinge portion 9 in the fuse unit 1. When it is bent, it engages with the locking piece 27 to fix the predetermined angle.

  Further, the locking piece 27 is insulated from the circuit (bus bar 3) of the fuse unit 1. For example, the locking piece 27 is configured separately from the bus bar 3. When the resin bodies 5 and 7 are provided on the bus bar 3 by insert molding, the locking pieces 27 are integrally installed on the resin body 5. In the state of being integrally installed in this way, the resin body 5 exists between the bus bar 3 and the locking piece 27 (a part of the resin body 5 enters), and the bus bar 3 On the other hand, the locking piece 27 is insulated.

  Moreover, the latching piece 27 is comprised separately from the fuse unit 1, for example, when providing the resin bodies 5 and 7 in the bus bar 3 by insert molding, the latching piece 27 is provided simultaneously. The locking piece 27 is formed as a separate body, and after the resin bodies 5 and 7 are provided on the bus bar 3, the locking piece 27 is integrally attached to the resin body 5 of the fuse unit 1 with a fastener such as a bolt. May be provided.

  In addition, the to-be-latched piece 29 may be comprised separately from the latching piece 27, and may be provided in the resin body 7 simultaneously by insert molding, and the structure attached later may be sufficient.

  By the way, in the fuse unit 1, the unit part 30 provided with the resin body 5 is formed on one side with the hinge part 9 in between, and the unit part 32 provided with the resin body 7 is formed on the other side. ing.

  Here, regardless of whether or not the hinge portion 9 is bent, in the unit portion 30, the thickness direction of the bus bar 3 is the thickness direction of the unit portion 30, and the extending direction of the bending line of the hinge portion 9 is the unit direction. The width direction of the unit 30 (the direction orthogonal to the thickness direction) is defined, and the direction orthogonal to the thickness direction and the width direction is defined as the longitudinal direction of the unit unit 30. Similarly, in the unit portion 32, the thickness direction of the bus bar 3 is set as the thickness direction of the unit portion 32, and the extending direction of the bending line of the hinge portion 9 is the width direction of the unit portion 32 (direction orthogonal to the thickness direction). The direction perpendicular to the thickness direction and the width direction is the longitudinal direction of the unit portion 32. Therefore, in a state where the hinge portion 9 is not bent, each direction of the unit portion 30 and each direction of the unit portion 32 coincide with each other.

  As shown in FIG. 3, the locking piece 27 formed in the unit portion 30 is one inner wall in the width direction of the through hole 23 of the bus bar 3 or the resin body 5 (one inner wall in the width direction of the unit portion 30). 27A extending toward the center of the through hole 23 and the other inner wall in the width direction of the through hole 23 of the bus bar 3 or the resin body 5 (the other inner wall in the width direction of the unit portion 30). And a locking piece 27 </ b> B extending toward the center of the through hole 23. Each of the locking pieces 27 </ b> A and 27 </ b> B (27) is formed symmetrically with respect to the center of the through hole 23 in the width direction of the unit portion 30. Further, the distal end portion of the locking piece 27A and the distal end portion of the locking piece 27B are separated by a predetermined distance.

  More specifically, the locking piece 27A has a linear bending line 31 (31A, 31A, 31B) extending in the width direction of the material on the tip end side (one side in the longitudinal direction) of the elongated rectangular flat metal material. 31B and 31C) are formed in a shape bent in the thickness direction.

  The flat base end side (the other side in the longitudinal direction) is embedded in the resin body 5 and is provided integrally with the resin body 5 like a cantilever having elasticity. In this case, the intermediate portion in the longitudinal direction of the unfolded material and the tip end side of the folded material protrude into the through hole 23.

  Further, the flat portion of the material embedded in the resin body 5 and the flat intermediate portion of the material protruding into the through hole 23 are in the thickness direction of the unit portion 30. These width directions coincide with the longitudinal direction of the unit portion 30. The flat portion of the material embedded in the resin body 5 (the base end portion of the material) is insulated away from the bus bar 3.

  Further, in the embodiment shown in FIG. 3, the locking piece 27A has three bending lines (the first bending line in order from the front end side of the flat plate material) that are present on the front end side of the flat plate material. 31A, second bend line 31B, and third bend line 31C.), The same side is bent at an angle larger than 90 ° (for example, about 110 °). Thereby, when it sees from the longitudinal direction (width direction of 27 A of latching pieces) of the unit part 30, the site | part by the side of the front-end | tip part where the latching piece 27A was bent is formed in the triangle shape. The locking piece 27B is also formed in the same manner as the locking piece 27A. The triangular portions of the locking pieces 27A and 27B are located on one side of the unit portion 30 in the thickness direction (the side opposite to the side where the locked pieces 29 are inserted). .

  The locked piece 29 includes a columnar base end 33 and a truncated pyramid shaped tip 35 such as a quadrangular pyramid. The central axis of the base 33 and the central axis of the tip 35 are provided. Are formed in an umbrella shape in which the bottom surface of the distal end portion 35 (pyramid) having a large outer diameter is connected to the proximal end portion 33. Further, the outer diameter of the bottom surface of the pyramid at the distal end portion 35 is larger than the outer diameter of the base end portion 33, and the outer diameter of the upper surface of the pyramid at the distal end portion 35 is different from the outer diameter of the proximal end portion 33 and each of the relations. It is smaller than the interval between the stop pieces 27A and 27B.

  As described above, the locked piece 29 is formed as a part of the resin body 7, for example, and protrudes from one surface in the thickness direction of the unit portion 32. Then, when the hinge portion 9 is bent, the hinge portion 9 enters the through hole 23 of the unit portion 30, the tip portion 35 enters between the locking pieces 27A and 27B, and comes into contact with the locking pieces 27A and 27B. The pieces 27A and 27B are elastically deformed.

  When the hinge portion 9 is further bent and the bending angle reaches the target bending angle, the leading end portion 35 of the locked piece 29 passes through the locking pieces 27A and 27B, and the leading end portion 35 of the locked piece 29 is obtained. Is in contact with the locking pieces 27A and 27B (parts of the second bending line 31B), and the base end portion 33 of the locked piece 29 is positioned between the locking pieces 27A and 27B. (It is sandwiched in contact with the portion of the third bending line 31C), the elastic deformation of each of the locking pieces 27A and 27B is almost eliminated, and a part of the resin body 7 of the unit portion 32 is part of the resin body 5 of the unit portion 30. The locked piece 29 is fixed to the respective locking pieces 27A and 27B, and the bending angle of the hinge portion 9 (the bending angle between the unit portions 30 and 32) is fixed and maintained at the target value. It has come to be. In addition, the front-end | tip part 35 of the to-be-latched piece 29 may be truncated cone shape, pyramid shape, and cone shape.

  Here, the mode of the locking piece 27 and the locked piece 29 may be appropriately changed. That is, the locking piece 27 may be formed integrally with the bus bar 3. In addition, the locked piece 29 is formed of a highly rigid material such as a metal (separate from the resin material) that is formed separately from the bus bar 3 and is insulated from the bus bar 3 so as to be insulated. When the body 7 is provided by insert molding, it may be provided integrally with the resin body 7. In addition, when the to-be-latched piece 29 is comprised with materials, such as a metal, you may change suitably that the form of the to-be-latched piece 29 shall be comprised with the thin sheet metal. Further, the locked piece 29 may be formed integrally with the bus bar 3. In addition, when the to-be-latched piece 29 and the latching piece 27 are shape | molded integrally with the bus-bar 3, the hinge part 9 is bent to the target angle, and the latching piece 27 and the to-be-latched piece 29 are carried out. When engaged, the bus bar 3 of the unit part 30 and the bus bar 3 of the unit part 32 are electrically connected to each other. However, a soluble portion or the like is not provided between the portion of the bus bar 3 where the locking piece 27 protrudes and the portion of the bus bar 3 where the locked piece 29 protrudes, and the locking piece 27 protrudes. As long as the portion of the bus bar 3 and the portion of the bus bar 3 from which the latched piece 29 protrudes are conducted without a resistor, no particular problem occurs.

  Here, the modification of the latching piece 27 (27A, 27B) is demonstrated using FIGS. 5 to 7, the shape of the locking piece 27 (27A, 27B) is different from that shown in FIG. 3, and the other points are substantially the same as those shown in FIG. It is designed to work in almost the same way.

  In the embodiment shown in FIG. 5, the locking pieces 27 (27 </ b> A and 27 </ b> B) are arranged in two bending lines (on the front side of the flat plate material in order from the front side of the flat plate material). The bending line 31D and the second bending line 31E). The first bend line 31D is bent substantially at a right angle, and the second bend line 31E is bent at an angle smaller than 90 ° (for example, about 70 °).

  As a result, when the bending angle of the hinge portion 9 reaches the target bending angle, the bottom surface of the distal end portion 35 of the latched piece 29 is moved to the engagement pieces 27A and 27B (the distal ends of the engagement pieces 27A and 27B and The base end 33 of the locked piece 29 is positioned between the locking pieces 27A and 27B (the part of the second bending line 31E). The target bending angle is fixed.

  In the embodiment shown in FIG. 6, the locking piece 27 is bent at one bending line existing on the tip end side of the flat plate-like material. The bending line 31F is bent at an angle smaller than 90 ° (for example, about 70 °).

  Thereby, when the bending angle of the hinge portion 9 reaches the target bending angle, the bottom surface of the distal end portion 35 of the locked piece 29 comes into contact with the distal end portion of the locking piece 27, and the proximal end portion of the locked piece 29 33 is positioned between the front end portions of the locking pieces 27 so that the target bending angle is fixed.

  In the aspect shown in FIG. 7, the locking piece 27 has two bending lines (the first bending line 31G, in order from the leading end side of the flat plate material), which are present on the leading end side of the flat plate material. It is bent at the second bend line 31H). The bending lines 31G and 31H are bent at an angle smaller than 90 ° (for example, about 30 ° to 60 °). And the intersection angle of the site | part which exists between the bending line 31G and the front-end | tip part of the latching piece 27, and the site | part which exists in the base end part side of the latching piece 27 rather than the bending line 31G, It is almost 90 °.

  Thereby, when the bending angle of the hinge portion 9 reaches the target bending angle, the bottom surface of the distal end portion 35 of the locked piece 29 comes into contact with the distal end portion of each locking piece 27A, 27B, and the base end portion 33 is Positioned between the locking pieces 27A and 27B (sandwiched at a portion between the first bending line 31G and the tip of the locking piece 27) so that the target bending angle is fixed. It has become.

  In the above description, the through hole 11 and the through hole 23 are provided in the central portion of the unit portion 30, but the concave notch provided in the edge of the unit portion 30 (in the width direction of the unit portion 30). You may employ | adopt instead of the through-hole 11 and the through-hole 23). Then, the locking piece 27 in the notch may be provided, and the locked piece 29 may be provided at a position corresponding to the locking piece 27.

  According to the fuse unit 1, since the locking piece (locking portion) 27 is made of a metal material, the type of the resin bodies 5 and 7 constituting the fuse unit 1 is changed. In addition, the lock strength (locking strength) of the target bending angle in the hinge portion 9 can be reliably maintained. Further, when the fuse unit 1 is put into use by engaging the locking piece 27 and the locked piece (locked portion) 29 with each other in order to maintain the target bending angle in the hinge portion 9, The locking piece 27 and the locked piece 29 are located inside the through hole 23 and do not protrude outside the fuse unit 1. As a result, the outer shape of the fuse unit 1 can be prevented from becoming large, and the possibility that the locking piece 27 and the locked piece 29 are damaged by an impact received from the outside can be avoided as much as possible.

  Further, according to the fuse unit 1, since the locking piece 27 is insulated from the circuit of the fuse unit 1, the portion of the bus bar 3 exposed without being covered with the resin bodies 5 and 7 The possibility of a short circuit (short circuit) with the locking piece 27 can be avoided.

  Further, according to the fuse unit 1, since the locking piece 27 is configured separately from the fuse unit 1, it is easy to change the thickness and material of the locking piece 27. It is easy to change the spring force. Further, the width of the circuit in the bus bar 3 can be reduced.

DESCRIPTION OF SYMBOLS 1 Fuse unit 2 Bus bar 5, 7 Resin body 9 Hinge part 11, 23 Through-hole 27, 27A, 27B Locking piece 29 Locked piece

Claims (3)

A bus bar having a hinge portion provided in the intermediate portion and a through hole provided on one side of the hinge portion;
A first resin body covering a predetermined region on one side of the bus bar with the hinge portion in between so that the hinge portion is exposed and the through hole penetrates;
A second resin body covering a predetermined region on the other side of the bus bar with the hinge portion in between so that the hinge portion is exposed;
A locking piece made of a material having higher rigidity than the resin material constituting the first resin body and integrally provided in the first resin body so as to protrude into the through hole. When;
A locked piece that is provided integrally with the second resin body and engages with the locking piece and fixes the predetermined angle when the bus bar is bent at a predetermined angle by the hinge portion. ;
A fuse unit comprising: The fuse unit according to claim 1, wherein
The fuse unit, wherein the locking piece is insulated from a circuit of the fuse unit. In the fuse unit according to claim 1 or 2,
The fuse unit, wherein the locking piece is formed separately from the fuse unit.

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