JP3405305B2 - Electrical junction box - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an electric junction box, and more particularly to a lock structure of a case of an electric junction box. 2. Description of the Related Art Various electric circuits and electronic parts are stored, and as a connection branch point of wirings such as a wire harness,
An electrical junction box is used. FIG. 10 shows an example of this type of electric junction box. In FIG. 10, the electric connection box 50 includes an upper case 51 having a connector and the like, and a lower case 52 for accommodating an electric circuit such as a bus bar and an electronic component (not shown). The electric connection box 50 is made by assembling the upper case 51 integrally with a lower case 52 that contains an electric circuit such as a bus bar or an electronic component. The upper case 51 and the lower case 52 are assembled by a plurality of sets of lock structures provided on the upper case 51 and the lower case 52, respectively.
Hereinafter, one set of lock structures will be described with reference to the drawings. FIG. 11 is an exploded perspective view before the upper case 51 and the lower case 52 are assembled. FIG.
2, FIG. 13 shows an upper case 51 and a lower case 52.
FIG. 4 is a plan view and a sectional view of a main part after the parts are assembled. As shown in FIGS. 11 to 13, a concave portion 54 is provided at a predetermined position of the side frame 53 of the upper case 51 along the assembling direction (vertical direction). An upper case side engaging portion 55 is formed in the concave portion 54. As shown in FIGS. 11 and 13, the upper case side engaging portion 55 has a bottom surface 55a formed in a tapered shape. On the other hand, the lower case 52 is wider than the recess 54 in a side frame 57 for forming an accommodation recess 56 for accommodating an electric circuit such as a bus bar or an electronic component corresponding to the recess 54 of the upper case 51. Are provided. The slit portion 58 is connected to the side frame 57
Is formed by providing two notches 57a and 57b at a predetermined depth. A lower case side engaging portion 59 slightly narrower than the concave portion 54 protrudes from an inner side surface 58 a of the slit portion 58. The engaging portion 59
12 and 13, the tapered surface 59a
Are formed. The length h of the engaging portion 59 (the length protruding from the inner surface 58a of the slit portion 58) is
4 is substantially equal to the depth t. When the upper case 51 is mounted on the lower case 52 from above along the inner surface of the side frame 57 of the lower case 52, the tapered bottom surface of the upper case side engaging portion 55. When the contact portion 55a comes into contact with the lower case side engaging portion 59, the engaging portion 59 is pressed by the tapered bottom surface 55a, and the slit portion 58 is elastically deformed so as to bend with respect to the side frame 57. Eventually, the engaging portion 59 comes above the engaging portion 55, that is, the engaging portion 59.
When the pressing of the engaging portion 55 with respect to the
8 returns to the original position, and the lower surface of the engaging portion 59 and the upper surface of the engaging portion 55 are engaged. And the upper case 51
As shown in FIGS. 10 and 13, the lower case 52 is integrally assembled. The electric connection box 50 assembled in this manner prevents the upper case 51 from being easily detached from the lower case 52 due to the engaging portion 55 being hooked by the engaging portion 59. [0007] In recent years, recycling of resources has been demanded, and the electric junction box 50 which has become waste after use or defective during manufacture has been dismantled and separated for each material. It is required to be reused separately. That is, the upper case 51 and the lower case 52 are separated from each other, metal electronic components (for example, bus bars) housed in the upper case 51 are removed, and the resin upper case 51 and the lower case 52 are reused. It is supposed to. By the way, the above-mentioned conventional electric connection box 50
, That is, it is difficult to separate the upper case 51 and the lower case 52 from each other. More specifically, in the disassembly of the electric connection box 50, the upper case 51 and the lower case 52 are separated from each other by pressing the slit 58 in the direction f shown in FIGS. 12 and 13 and breaking the slit 58. Also, since the slit portion 58 is formed wider than the concave portion 54, the slit portion 58 abuts on the side frame 53 of the upper case 51 at that time and cannot be further deformed and cannot be easily broken. Therefore, conventionally, in dismantling the electric connection box 50, it is necessary to separate the upper case 51 and the lower case 52 using a jig or the like, which is not easy. The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric junction box which can be easily disassembled. [0010] In order to solve the above problems, the invention according to claim 1 is characterized in that an upper case side engaging portion provided on a side frame of an upper case and a housing recess are provided. An electrical connection integrally formed by engaging a lower case side engaging portion which is formed by cutting out a side frame of the lower case and which is bent independently of the side frame and which protrudes inside a slit portion. in the box, the space in which the slit portion is bent provided between the lower side of the slit portion from the side frame and the lower case side engagement portion of the upper case side engagement portion from the lower side of the upper case, the lower case Below the side engagement part
Is pressed with a predetermined pressing force.
Bending towards the side frame of the upper case
It is a gist that it is formed as described above . According to a second aspect of the present invention, in the electrical junction box according to the first aspect, the upper case side engaging portion divides a concave portion provided in a side frame of the upper case into upper and lower portions. Thus, the gist is that the slit portion is formed narrower than the concave portion. According to the first aspect of the present invention, when the slit below the lower case side engaging portion is pressed, the slit portion is on the side of the upper case below the upper case side engaging portion. Ru can be deformed to break toward the frame. This and
Come, since the first locking means and second locking means is engaged, b Ah case side engagement portion is bending deformation of the slit portion not escape from the upper case side engagement portion is restricted You.
Therefore, the slit portion is easily broken when pressed with a predetermined pressing force, and the lock between the upper case and the lower case is released by the breakage of the slit portion, so that the electric connection box is disassembled without using a jig or the like. Can also be easily performed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 to 3, the electric connection box 10 of the present embodiment accommodates an upper case 11 formed with a connector and the like (not shown), an electric circuit such as a bus bar, and electronic components (not shown). And a lower case 12. A recess 14 extending in the height direction of the upper case 11 is provided at a predetermined position of the side frame 13 of the upper case 11.
Is provided. An upper case-side engaging portion 15 for dividing the concave portion 14 up and down is formed in the concave portion 14. 1 and 3, the bottom surface 15a of the upper case side engaging portion 15 is formed in a tapered shape. As shown in FIGS. 1 to 3, a locking recess 15 c as a first locking means is formed on the upper surface 15 b of the upper case side engaging portion 15. In the present embodiment, the locking recess 15c is formed in a triangular longitudinal section. As shown in FIGS. 1 and 2, the lower case 12 has a side for forming an accommodating recess 16 for accommodating an electric circuit such as a bus bar or an electronic component corresponding to the recess 14 of the upper case 11. A slit portion 18 slightly narrower than the concave portion 14 is provided in the frame 17. As shown in FIGS. 1 and 3, the slit portion 18 is provided on the side frame 17.
Two notches 17 of a predetermined length L toward the lower side of
a, 17b. The inner surface 18 at the upper end of the slit 18
As shown in FIGS. 1 to 3, a lower case side engaging portion 19 having the same width as the slit portion 18 is protrudingly provided at a. The engaging portion 19 has a tapered surface 19b formed from its upper surface 19a and a locking projection 19d as second locking means formed on its lower surface 19c. In this embodiment, the locking projection 19d is formed in a triangular longitudinal section, and the length H of the engagement portion 19 (the length protruding from the inner surface 18a of the slit portion 18) is equal to the depth T of the recess 14. They are set to be almost the same. When the upper case 11 is assembled to the lower case 12 from above with the side frame 13 along the inner surface of the side frame 17 of the lower case 12, the tapered bottom surface of the upper case side engaging portion 15 is formed. When the contact 15 a comes into contact with the lower case side engaging portion 19, the engaging portion 19 is pressed by the tapered bottom surface 15 a, and the slit portion 18 is elastically deformed so as to bend with respect to the side frame 17. Eventually, the engaging portion 19 comes above the engaging portion 15, that is, the engaging portion 19
When the pressing of the engaging portion 15 with respect to the
8 returns to the original position, whereby the locking projections 19d
Engages in the locking recess 15c to engage the lower surface 19c of the engaging portion 19.
And the upper surface 15b of the engaging portion 15 abuts. Then, the upper case 11 is assembled integrally with the lower case 12 as shown in FIG. At this time, the upper case 11 is not easily detached from the lower case 12 because the engaging portion 15 is hooked by the engaging portion 19. Also, the disassembly of the electrical junction box 10 which has become waste after use or defective during manufacture, that is, the upper case 11
When the upper case 11 is separated from the lower case 12 by pressing the slit portion 18 below the engaging portion 19 in the direction F shown in FIGS. 2 and 3, the root portion of the slit portion 18 is broken. And the lower case 12 is unlocked. At this time, in the present embodiment, the length L of the slit 18 is
Is set to break at the root of the slit portion 18 when pressed with a predetermined pressing force, as shown in FIG. According to the electric junction box 10 of the present embodiment, the following features can be obtained. (1) In the present embodiment, the side frame 13 of the upper case 11
The upper case side engaging portion 1
5 is formed, and a locking recess 15c is formed in the upper surface 15b of the upper case side engaging portion 15. Further, the lower case 12 is provided with a slit portion 18 slightly narrower than the concave portion 14, and the slit portion 18 is provided with a lower case-side engaging portion 19 having a locking projection 19 d formed thereon. . Therefore, when the slit portion 18 is pressed, the slit portion 18 below the engaging portion 19 is pressed into the concave portion 14 and can be deformed. On the other hand, the locking projection 19d
Is engaged with the locking recess 15c, so that the slit 1
8 is pressed, the lower case side engaging portion 19 does not escape from the upper case side engaging portion 15, and the bending deformation of the slit portion 18 is regulated. As a result, the slit portion 18 is easily broken when pressed with a predetermined pressing force, and the lock between the upper case 11 and the lower case 12 is released by the breakage of the slit portion 18. Can be easily performed without using a jig or the like. This embodiment may be modified as follows. As shown in FIG. 4, a reinforcing rib 20 may be protruded from the inner surface of the side frame 17 below the slit portion 18 in a range corresponding to the slit portion 18. In this case, in addition to the effects described in the features of the above embodiment, the slit portion 18
Since the strength of the lower side frame 17 is higher than the strength of the slit portion 18, stress concentration tends to occur in the slit portion 18 near the boundary, that is, the slit portion 18 is easily broken from its root portion. , Electrical junction box 10
Can be more easily dismantled. As shown in FIGS. 5 and 6, the upper case 11 is arranged so that the side frame 13 below the upper case side engaging portion 15 does not at least protrude outward from the bottom surface 14a of the concave portion 14. It may be formed as a recess. In this case, effects similar to the effects described in the features of the above embodiment can be obtained. ○ Further, the present invention may be implemented as shown in FIGS. More specifically, the upper case 31 of the electric connection box 30 is separated from the side frame 32 by the upper case side engaging portion 33.
Is protruding outward. As shown in FIGS. 7 and 9, the upper case side engaging portion 33 has a bottom surface 33a formed in a tapered shape. As shown in FIGS. 7 to 9, a locking recess 3 as a first locking means having a triangular longitudinal section is provided on the upper surface 33 b of the upper case side engaging portion 33.
3c is formed. On the other hand, the lower case 34 of the electric connection box 30
Is provided with a slit portion 36 in the side frame 35 corresponding to the upper case side engaging portion 33. As shown in FIGS. 7 and 9, the slit portion 36
Is formed by providing two notches 35a and 35b with a predetermined length. As shown in FIGS. 8 and 9, the slit 36 has a recess 3 at a predetermined depth so that a lower case side engaging portion 37 is formed at the upper end thereof.
8 are provided. A tapered surface 37a is formed from the upper surface of the lower case side engaging portion 37, that is, the upper surface of the side frame 35, and the lower surface 37b of the lower case side engaging portion 37 is formed.
Is provided with a locking projection 37c as a second locking means for engaging with the locking recess 33c. Therefore, also in this case, the same effects as those described in the features of the above embodiment can be obtained. In the above embodiment and another example, the locking recesses 15c, 33c
The locking projections 19d and 37c are formed to have a triangular vertical section, but the locking recesses 15c and 33c and the locking projections 19d and 37c are formed into other shapes other than the triangle having a vertical cross section, such as a quadrangle. It may be formed and implemented. in this case,
The same effects as those described in the features of the above embodiment and other examples can be obtained. The locking concave portions 15c and 33c may be replaced with locking convex portions, and the locking convex portions 19d and 37c may be replaced with locking concave portions. Further, the locking concave portions 15c and 33c and the locking convex portions 19d and 37c may be omitted. in this case,
It is possible to obtain substantially the same effects as those described in the features of the above embodiment and other examples. Next, technical ideas other than the invention described in the claims which can be understood from the above embodiment and other examples will be described below together with their effects. (1) In the electrical junction box according to claim 1 or 2,
An electric connection box, wherein a reinforcing rib is provided on an inner surface of a side frame below the slit portion in a range corresponding to the slit portion. Therefore, in addition to the effect of the electric junction box according to claim 1 or 2, the strength of the side frame below the slit becomes stronger than the strength of the slit, so that the root of the slit near the boundary thereof. Stress concentration is likely to occur in the portion, and the slit portion is easily broken from the root portion. (2) The electrical junction box according to claim 1 or 2, wherein the length of the slit is set so as to be broken when the slit is pressed with a predetermined pressing force. Electrical junction box. Therefore, in addition to the effect of the electric connection box according to claim 1 or 2, the electric connection box can be reliably disassembled. (3) The electrical junction box according to claim 1, wherein the first
The electrical connection box, wherein the locking means and the second locking means are formed in engaging concave and convex portions having an engaging relationship with each other. Therefore, in addition to the effect of the electric junction box according to the first aspect, the electric junction box can be easily manufactured. As described in detail above, claim 1 or 2
According to the invention described in (1), the electric junction box can be easily disassembled.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a main part of an upper case and a lower case before engagement according to the present invention. FIG. 2 is a plan view of a main part of an upper case and a lower case after engagement according to the present invention. FIG. 3 is a sectional view taken along line AA in FIG. 2; FIG. 4 is an essential part cross-sectional view of an upper case and a lower case after engagement according to another example. FIG. 5 is a perspective view of a main part of another example of an upper case. FIG. 6 is an essential part cross-sectional view of an upper case and a lower case after engagement according to another example. FIG. 7 is a perspective view of a main part of an upper case and a lower case before engagement according to another example. FIG. 8 is a plan view of main parts of an upper case and a lower case after engagement according to another example. FIG. 9 is a sectional view taken along line BB in FIG. 8; FIG. 10 is a perspective view of a main part of a conventional electric junction box. FIG. 11 is a perspective view of a main part of a conventional upper case and a lower case before engagement. FIG. 12 is a plan view of a main part of an upper case and a lower case after a conventional engagement. FIG. 13 is a sectional view taken along line CC in FIG. 12; [Description of Signs] 10, 30: electrical junction box, 11, 31: upper case, 12, 34: lower case, 13, 32: side frame, 1
4 ... recessed part, 15, 33 ... upper case side engaging part, 15
b, 33b: upper surface of the upper case side engaging portion, 15c,
33c: locking recess as first locking means, 16: housing recess, 17, 35 ... side frame of lower case, 18, 36 ...
Slit part, 18a ... Inner side surface of slit part, 19, 37
... lower case side engaging portion, 19c, 37b ... lower surface of lower case side engaging portion, 19d, 37c ... locking projection as second locking means.

Claims (1)

(57) Claims 1. An upper case side engaging portion provided on a side frame of an upper case, and a side frame formed by cutting out a side frame of a lower case having a housing recess. Is an electric connection box that is integrally assembled by engaging with a lower case-side engaging portion protruding inside a slit portion that flexes independently, wherein the upper case below the upper case-side engaging portion. A space where the slit portion is bent is provided between the side frame and the slit portion below the lower case side engaging portion, and a first locking means is provided on the upper surface of the upper case side engaging portion. the on the lower surface of the lower case side engagement portion provided with the second locking means to recess-projection engaging with said first locking means, the lower
-The slit part below the case side engaging part
Pressed by force to move to the side frame of the upper case
An electrical junction box formed so as to be bent and deformed .