JP2010178452A - Electric component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a lock coupling portion of a case housing a bus bar from being broken at unlocking. <P>SOLUTION: A U-shaped first locking portion 51 equipped with coupling frames 54 on the ends of both side frames 53, 53 are provided on both side walls 34 of a first case 31, second locking portions 52 each equipped with a locking claw 57 for engaging the first locking portion 51 are provided on both side walls 44 of a second case 32, and rounded portions 55a, 55a and 55b, 55b are provided on the root of width direction inner surfaces 53a, 53a of both side frames 53, 53 of the first locking portion 51 and the root of thickness-direction outer surfaces 53b, 53b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electrical component, and more particularly, to improve a locking structure of an electrical component in which a fusible link integrated bus bar is accommodated in a first case and a second case that are locked together.

  In recent years, fusible link integrated bus bars have been used in electrical junction boxes for vehicles. This bus bar is formed by integrally punching an input part and a plurality of fusing parts and an output part from a conductive metal plate. The bus bar is housed in a dedicated housing to form a fusible link unit for electrical connection. Mounted inside the box case.

FIG. 7 shows an example of this type of fusible link unit. The fusible link unit 1 accommodates a fusible link integrated bus bar 2 inside a first case 3 and a second case 4 that are locked together. The bus bar 2 integrates an input terminal portion 2b, a plurality of narrowed fusing portions 2c, and a plurality of output terminal portions 2d via a common input portion 2a.
An example of a similar fusible link unit is also shown in Japanese Patent Application Laid-Open No. 2007-288934 (Patent Document 1) related to the earlier application of the present applicant.

  The first case 3 covers the rear surface side of the bus bar 2, the second case 4 covers the front surface side of the bus bar 2, and the U-shaped lock frame portion 5 is provided on the first case 3 side from the peripheral wall of the second case 4. An insertion recess 6 is provided on the outer surface of the peripheral wall of the first case 3 so that the lock frame portion 5 can be accommodated, and a lock claw 7 that is locked to the lock frame portion 5 on the bottom surface of the insertion recess 6. Is protruding.

  However, as shown in FIG. 8, the lock frame portion 5 does not have a radius at the roots 5a and 5b. Therefore, as shown in FIG. 9, when the jig 8 is inserted between the lock frame portion 5 and the insertion recess 6 in the lock coupled state to release the lock, the lock frame portion 5 is inserted by inserting the jig 8. There is a problem in that stress generated by bending outward tends to concentrate on the respective bases 5a and 5b, the bases 5a and 5b are easily damaged, and the lock frame portion 5 is easily broken.

JP 2007-288934 A

  The present invention has been made in view of the above problems, and in an electrical component in which a fusible link-integrated bus bar is accommodated in the first case and the second case that are locked to each other, lock damage at the time of unlocking is prevented. Is an issue.

In order to solve the above-mentioned problem, the present invention connects a fusible link-integrated bus bar in which a plurality of output units are connected in parallel to a common input unit via a fusing unit by a lock unit provided on a peripheral wall. Electric parts housed in the first case and the second case,
From the peripheral wall of the first case toward the second case side, a U-shaped first lock portion provided with a connecting frame at the front end of both side frames protrudes, while the peripheral wall of the second case A second lock portion having a lock claw that is locked to the connection frame of the first lock portion;
An electrical component is provided in which the bases of the inner surface in the width direction and the outer surface in the thickness direction of both side frames of the first lock portion are erected with a rounded shape.

  Since the cross-sectional area of the base portion of both side frames can be increased by rounding the bases of the both side frames of the first lock portion in this way, the first lock portion bends when unlocking. Therefore, the concentration of the stress generated by the above can be alleviated, and damage to the root can be prevented.

The length A in the width direction and the length B in the thickness direction of both side frames of the first lock portion are A> B, and the root radius RA of the inner surface in the width direction and the radius R RB of the outer surface in the thickness direction Is preferably RA ≦ RB.
Thus, the length A in the width direction of both side frames is set to be larger than the length B in the thickness direction.
Further, the root radius RA of the inner surface in the width direction of both side frames is made smaller or the same as the radius RB at the root of the outer surface in the thickness direction.

  By adopting the above-described configuration, it is possible to secure the ease of bending the both side frames outward in the thickness direction, so that it is possible to reliably prevent breakage during unlocking and to easily perform the unlocking operation. In addition, stress concentration due to expansion of the cross-sectional area of the root portion can be alleviated.

  The ratio of R to RB is preferably 1.0 to 2.0 times. If it is less than 1.0 times, the bases of the inner surfaces in the width direction of the both side frames protrude too inward and the lock coupling is easily released, or the protruding amount of the bases of the outer surfaces in the thickness direction of both side frames is too small. The stress concentration relaxation effect due to expansion tends to be insufficient. On the other hand, if it exceeds 2.0 times, the amount of protrusion to the inside of the root of the inner surface in the width direction of both side frames is too small, and the stress concentration relaxation effect due to expansion of the cross-sectional area becomes insufficient, or the root of the outer surface in the thickness direction of both frames There is a problem in that the amount of protrusion increases so much that the lock portion becomes large.

  The outer surfaces in the width direction of both side frames of the first lock portion located on the outer surface side of the peripheral wall of the first case are positioned on the same plane as the outer surface of the peripheral wall of the first case. Thereby, while being able to make the outer surface of a case into a flat surface, a case can be reduced in size. As a result, it is possible to reduce the installation space when housed in the electrical junction box.

  As described above, according to the present invention, since the cross-sectional area of the root portion can be enlarged by attaching a radius to the bases of the both side frames of the first lock portion, the first lock portion is outside by a jig when unlocking. It is possible to alleviate the concentration of stress generated by bending to the root, and to effectively prevent breakage of the root and breakage of the first lock portion.

  In addition, since the length A in the width direction and the length B in the thickness direction of the both side frames of the first lock portion are set as A> B, the ease of bending of the both side frames in the thickness direction can be secured. The unlocking operation performed by inserting a jig between the lock portion and the second lock portion can be easily performed.

  Further, by setting RA at the base of the inner surface in the width direction and RB at the base of the outer surface in the thickness direction to RA ≦ RB, the both side frames of the first lock portion can be enlarged while increasing the cross-sectional area of the base portion of the both side frames. It is possible to balance so that the root of the inner surface in the width direction does not protrude too much inward, and the stress concentration on the root can be alleviated.

It is a disassembled perspective view of the fusible link unit which concerns on 1st embodiment of this invention. It is an enlarged view which shows the 1st locking part of the exclusive housing shown in FIG. 1, (A) is a perspective view, (B) is a front view, (C) is a side view. It is an expansion perspective view which shows the 2nd lock | rock part of the exclusive housing shown in FIG. The fusible link unit in a state where the first case and the second case are locked and coupled is shown, (A) is a front view, and (B) is a side view. It is an enlarged view which shows the state which couple | bonded the 1st lock part and the 2nd lock part, (A) is a perspective view, (B) is the BB sectional drawing of (A). It is explanatory sectional drawing of a lock release operation | work. It is a disassembled perspective view which shows a prior art example. It is a figure which shows the principal part of the lock part of a prior art example. It is a figure which shows the trouble of a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In any of the embodiments, the present invention is applied to the fusible link unit 10 that is housed and fixed in an electrical connection box (not shown) mounted in an engine room of an automobile.

1 to 6 show a fusible link unit (electric part) 10 according to a first embodiment of the present invention.
As shown in FIG. 1, the fusible link unit 10 includes a fusible link integrated bus bar 11 and a resin-made dedicated housing 30 that accommodates the bus bar 11 in the vertical direction. As shown in FIG. 1, the dedicated housing 30 includes a first case 31 that covers the back side of the bus bar 11 and a second case 32 that covers the front side, both of which are made of a resin molded product made of polypropylene.

  As shown in FIG. 1, the bus bar 11 is formed by punching one conductive metal plate. Specifically, the upper side of the bus bar 11 is a horizontally long common input unit 12, the left and right sides of the common input unit 12 are battery system input units 12A, the other side is an alternator system input unit 12B, and the battery system input unit 12A and the alternator system input part 12B are connected via one second fusing part 17 having a narrow S-shape.

  From the upper end of the battery system input section 12A, a battery terminal section 13 connected to the battery is bent in the horizontal direction and protruded from the lower end of the battery system input section 12A. A first fusing part 15A having an S-shaped width is provided so as to project an output terminal part 16A connected to the battery system circuit at the tip of the first fusing part 15A. On the other hand, from the upper end of the alternator system input portion 12B, an alternator terminal portion 14 connected to the alternator protrudes in the same direction as the battery terminal portion 13, and from the lower end, a plurality of intervals are provided. A first fusing part 15B having a narrow S-shape is projected, and an output terminal part 16B connected to an alternator circuit is formed at the tip of the first fusing part 15B.

Bolt holes 18 are formed in the battery terminal portion 13 and the alternator terminal portion 14, respectively, and a power line terminal (not shown) connected to the battery is connected by bolting.
A bolt hole 19 is also formed in the output terminal portion 16B, and an electric wire terminal (not shown) connected to an electrical component such as an alternator is connected by bolting.
A wire terminal (not shown) connected to other electrical components is connected to the output terminal portion 16A.
A plurality of holes 20 through which positioning pins are inserted are formed in the upper portions of the output terminal portions 16A and 16B. A plurality of holes 21 are formed in the upper part of the common input part 12 at intervals in the lateral direction.

The shapes of the first case 31 and the second case 32 that accommodate the bus bar 11 will be described in detail below. The first case 31 includes a back wall 33 that faces the back surface of the bus bar 11, and both side walls 34, an upper wall 35, and a lower wall 36 erected from the periphery of the back wall 33.
On the inner surface side of the back wall 33, a first recess 37 is formed at a position facing the first fusing parts 15 </ b> A and 15 </ b> B of the bus bar 11, and a second recess 38 is formed at a position facing the second fusing part 17. In addition, a partition wall 39 is provided between the first recesses 37.
A third recess 40 is formed on the inner surface of the lower side portion of the back wall 33 to accommodate the upper side portions of the output terminal portions 16A and 16B of the bus bar 11, and the third recess 40 penetrates the lower wall 36. Open to the bottom side. From each 3rd recessed part 40, the some positioning pin 41 inserted and latched by the said hole 20 of output terminal part 16A, 16B is protrudingly provided.
A plurality of positioning pins 42 that are inserted and locked into the holes 21 of the common input portion 12 of the bus bar 11 are also provided on the inner surface of the upper portion of the back wall 33.

The second case 32 includes a front wall 43 that faces the surface of the bus bar 11, and both side walls 44, an upper wall 45, and a lower wall 46 that protrude from the periphery of the front wall 43 toward the inner surface.
The front wall 43 is provided with openings 47 at positions facing the first fusing parts 15A, 15B and the second fusing part 17 of the bus bar 11, and through the openings 47, the fusing parts 15A, 15B, 17 are provided. The fusing state is made visible from the outside.
Further, a concave portion 48 is formed on the outer surface of the upper wall 45 to project the battery terminal portion 13 and the alternator terminal portion 14 to the outside.

The first case 31 and the second case 32 are formed on the first lock portions 51 formed on the side walls 34 of the first case 31 and the side walls 44 of the second case 32 in a state where the bus bar 11 is accommodated. The second lock part 52 is locked to each other.
In this locked connection state, the bus bar 11 is sandwiched between the first case 31 and the second case 32 from both the front and back surfaces, and as shown in FIGS. 4A and 4B, the battery terminal 13 and the alternator are used. The terminal portion 14 protrudes horizontally from the gap between the concave portion 48 of the second case 32 and the upper wall 35 of the first case 31, and the output terminal portions 16 </ b> A and 16 </ b> B are connected to the third concave portion 40 of the first case 31. And the lower wall 46 of the second case 32 protrude downward. Further, both side walls 34 of the first case 31 and both side walls 44 of the second case 32 are continuous on the same plane as shown in FIG.

  As shown in FIG. 2A, the first lock portion 51 connects the front ends of both side frames 53, 53 erected from the side walls 34 of the first case 31 toward the second case 32 with a connection frame 54. It consists of a U-shaped frame. The width direction outer surface 51a of the first lock portion 51 is located on the same plane as the outer surfaces of the side walls 34 of the first case 31, as shown in FIG.

  The length A in the width direction of the both side frames 53, 53 is larger than the length B in the thickness direction as shown in FIG. Further, the bases of the width direction inner surfaces 53a and 53a and the bases of the thickness direction outer surfaces 53b and 53b of the both side frames 53 and 53 are curved so as to protrude outward as they come closer to the roots, respectively. Continuous round portions 55a, 55a, 55b, and 55b are formed. The radius RA of the round portions 55a and 55a of the inner surfaces 53a and 53a in the width direction is larger than the radius RB of the round portions 55b and 55b of the outer surfaces 53b and 53b in the thickness direction, as shown in FIGS. It is small. The R RA may be the same as the R RB.

  As shown in FIG. 3, the second lock portion 52 includes an insertion portion 56 into which the first lock portion recessed in the outer surface of both side walls 44 of the second case 32 is inserted, and a bottom surface 56 a of the insertion portion 56. The lock claw 57 is more projecting. The depth of the insertion portion 56 is the same as the thickness of the side frames 53 of the first lock portion 51.

  As shown in FIG. 1, a U-shaped first auxiliary lock 61 is provided on the inner surface of the lower portion of the back wall 33 of the first case 31. From the inner surface side of the front wall 43 of the second case 32, a second auxiliary lock portion 62 made of a locking claw is provided in a projecting position at a position facing the first auxiliary lock portion 61. When the first lock portion 51 and the second lock portion 52 are locked, the first auxiliary lock portion 61 and the second auxiliary lock portion 62 are also locked.

  The fusible link unit 10 having the above-described configuration has rounded portions 55a, 55a, 55b, and 55b at the roots of the inner surfaces 53a and 53a in the width direction and the outer surfaces 53b and 53b in the thickness direction of both side frames 53 and 53 of the first lock portion 51. The cross-sectional area of the base part of the side frames 53 and 53 is enlarged. Therefore, as shown in FIG. 6, when the jig 58 is inserted between the first lock portion 51 and the second lock portion 52 to release the lock, the first lock portion 51 is bent outward. The concentration of stress on the root portions of the side frames 53 and 53 can be alleviated. Therefore, it is possible to effectively prevent the base of the first lock portion 51 from being damaged or broken when the lock is released.

  Further, since the length A in the width direction of the both side frames 53, 53 of the first lock portion 51 is made larger than the length B in the thickness direction, the deformability of the first lock portion 51 in the thickness direction is ensured. can do. Therefore, since the first lock portion 51 can be easily bent outward in the thickness direction by the jig 58 at the time of unlocking, the unlocking workability can be improved.

  Further, by making the radius RA of the first lock portion 51 smaller than the radius RB, the widthwise inner surfaces 53a, 53a of the side frames 53, 53 can be enlarged while increasing the cross-sectional area of the base of the first lock portion 51. It is possible to prevent the rounded portions 55a and 55a from protruding too far inward. As a result, as shown in FIG. 5B, in the locked state, the rounded portions 55a and 55a cause the width direction inner surface 51b of the first lock portion 51 and the bottom surface 56a of the insertion portion 56 of the second lock portion 52 to It is possible to prevent the gap between the first locking portion 51 and the locking claw 57 of the second locking portion 52 from being deeply and stably locked.

  Further, the outer surface 51a in the width direction of the first lock portion 51 and the outer surface of the both side walls 34 of the first case 31 are positioned on the same plane, and both the side walls 34 of the first case 31 are in the locked state. Since both side walls 44 of the second case 32 are continuous on the same plane, the first lock portion 51 can be prevented from projecting outward from the peripheral wall of the housing 30, and the first lock portion 51 can be used as a peripheral component. It is possible to prevent a problem that the lock is released due to being caught.

10 Fusible link unit (electrical parts)
11 Bus bar 12 Common input part 15A, 15B (1st) Fusing part 16A, 16B Output terminal part 30 Dedicated housing 31 1st case 32 2nd case 51 1st lock part 52 2nd lock part 53 Both sides frame 53a Width direction inner surface 53b Thickness direction outer surface 55a Earl part (RA)
55b Earl part (RB)
57 Locking claw

Claims (3)

A bus bar integrated with a fusible link, in which a plurality of output parts are connected in parallel to the common input part via a fusing part, is accommodated in a first case and a second case that are coupled to each other by a locking part provided on the peripheral wall. Electrical parts that are
From the peripheral wall of the first case toward the second case side, a U-shaped first lock portion provided with a connecting frame at the front end of both side frames protrudes, while the peripheral wall of the second case A second lock portion having a lock claw that is locked to the connection frame of the first lock portion;
An electrical component characterized in that a root portion of the inner surface in the width direction and the outer surface in the thickness direction of both side frames of the first lock portion is provided with a rounded shape.   The length A in the width direction and the length B in the thickness direction of both side frames of the first lock portion are A> B, and the root radius RA of the inner surface in the width direction and the radius R RB of the outer surface in the thickness direction The electrical component according to claim 1, wherein RA ≦ RB.   The width direction outer surface of the both-sides frame of the said 1st lock part located in the outer surface side of the surrounding wall of the said 1st case is located on the same plane as the surrounding wall outer surface of the said 1st case. Electrical components as described.

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