JP5113648B2 - Assembly parts - Google Patents

Description

  The present invention relates to an assembly component, and more particularly, to a structure of a fastening portion that attaches an assembly component in which an electric circuit is formed in a synthetic resin case to an assembly target such as an actuator with a screw or the like.

  For example, when attaching an electrical connection box, which is an assembly part, to an assembly target such as an actuator or a vehicle body, a fastening portion having a through hole is provided at the corner of the case of the electrical connection box, and electrical connection is made by a screw inserted into the through hole. The box is fixed to the assembly target (for example, Patent Document 1). In addition, in order to ensure the strength of the through hole, a metal cylinder (hereinafter referred to as a collar) is disposed on the inner surface of the through hole and is integrally formed with the case. Moreover, in order to ensure the airtightness of the junction surface of an electrical junction box and an assembly object, a packing groove | channel is provided in the periphery of the case of an electrical junction box, and the assembly object is assembled | attached on both sides of packing.

JP 2005-243332 A

  However, in Patent Document 1, no consideration is given to a problem in the case where the fastening portion is formed to protrude outward from the side wall of the case. In other words, if a metal collar is inserted into the protrusion protruding outward from the side wall of the case and molded integrally, the resin thickness around the collar may become uneven depending on the shape of the protrusion, and heat in the cooling process after molding Due to the deformation, the positional accuracy of the through hole may not be obtained. In particular, the wall thickness of the case side wall is generally thin, so that it is easily deformed, and there is a problem that the position accuracy of the through hole is difficult to be obtained.

  Therefore, in order to reduce the thermal deformation of the protruding part at the time of molding, it is conceivable to reduce the thickness by forming a recessed part in the thick part of the resin around the collar to make the thickness around the collar uniform. .

  However, depending on the application of the electrical junction box, as described in Japanese Patent Application Laid-Open No. 2006-142329, the “accelerated test (SAEJ2334) simulating the salt damage and corrosion environment in the North American snow belt” defined by the American Iron and Steel Institute (AISI). A salt damage test may be required, and during this salt damage test, salt crystals may form in the recesses formed in the protrusions, and depending on the position and shape of the recesses formed in the protrusions, etc. There is a possibility that salt crystals accumulate, and there is a risk that the accumulated salt crystals may enter the case from the packing part of the assembly target and the case, and in some cases, the seal between the assembly target and the case may not be ensured. Furthermore, there is a possibility that cracks occur in the resin around the collar due to salt accumulation.

  The problem to be solved by the present invention is that the resin around the collar of the fastening part of the assembly part can be thinned to make the thickness uniform, thereby improving the positional accuracy of the through hole, and the airtightness reduction due to salt damage, etc. This is to prevent inconvenience.

In order to solve the above-described problems, the present invention provides a case made of a synthetic resin having a base plate on which an electric circuit is formed and a side wall formed upright on a peripheral portion of the base plate, and the case The fastening portion having a through-hole formed on the peripheral edge of the opening and having a metal collar attached thereto, and a packing disposed on the opening peripheral edge of the side wall of the case are assembled to the assembly target, and the through-hole of the fastening portion a assembled parts are secured to the target assembly the insert a screw, the fastening portion comprises at concluded portion formed to protrude outward from the side wall of the case, outwardly from the side wall of the case concluded portion formed by protruding along said axial direction of the collar has a protrusion that extends to surround the cylindrical outer circumference of the collar, one end face of the extending direction of the projecting portion is the The protrusion is formed flush with the opening surface of the side wall. Wherein the recessed portion from the extending direction both side surfaces of the parts reach the outer periphery of the collar is formed.

  In other words, since the concave portions that reach the outer periphery of the collar from both side surfaces in the extending direction of the protruding portion are formed, the resin thickness of the protruding portion can be substantially equalized, so that thermal deformation during molding can be suppressed and penetrated. The positional accuracy of the hole can be increased. In particular, concave portions for thinning are formed on both sides of the protruding portion, and no concave portion is formed on the end surface formed flush with the opening surface attached to the assembly target. Even if salt crystals accumulate, the risk of the accumulated salt crystals entering the case from the packing portion can be avoided. Thereby, inconveniences, such as airtight fall by salt damage, can be prevented.

  In the above case, the protruding portion can be further connected to the recessed portion, and a through hole can be formed along the extending direction thereof. According to this, since the resin thickness of the protruding portion can be further equalized, the position accuracy of the through hole can be further increased. In this case, the through-hole connected to the recessed portion opens to the end surface formed flush with the assembly surface. However, even if salt crystals are generated in the recessed portion or the through-hole in the salt damage test, salt accumulation is not caused. Since the space is wide and the through hole is formed over the entire length of the projecting portion, the risk of salt crystals entering the case from the packing portion can be avoided, and inconveniences such as airtight deterioration due to salt damage can be prevented.

  According to the present invention, it is possible to equalize the wall thickness by reducing the thickness of the resin around the collar of the fastening part of the assembly part, thereby increasing the positional accuracy of the through hole, and to prevent inconveniences such as a decrease in airtightness due to salt damage. Can do.

Hereinafter, the present invention will be described based on embodiments.
(Embodiment 1)
With reference to FIGS. 1-5, one Embodiment of the electrical-connection box of this invention is described. 1 and 2 are configuration diagrams of the electrical junction box according to the first embodiment. FIG. 1A is a plan view of the electrical junction box, FIG. 1B is a top view, and FIG. 1C is a right side view. . FIG. 2 is a rear view of the electrical junction box. 3 is a cross-sectional view taken along arrow III-III in FIG. 1B, FIG. 4 is a cross-sectional view taken along arrow IV-IV in FIG. 1A, and FIG. 5 is FIG. It is arrow sectional drawing seen from arrow V-V.

  As shown in these drawings, the electrical junction box 1 of the first embodiment includes a case 2 made of synthetic resin, an electrical circuit 3 formed in the case 2, and an actuator that does not illustrate the electrical junction box 1, for example, an actuator And a plurality of fastening portions 4 (a to d) for attachment to the head.

  The case 2 is formed in a flat box shape with an upper surface opened, and has a base plate 5 in which an electronic circuit 3 is formed and a side wall 6 formed upright on the peripheral edge of the base plate 5. is doing. A conductor such as a metal bus bar is insert-molded on the base plate 5, and a plurality of connection terminals 7 protrude from the back surface. A groove 8 in which a packing (not shown) is mounted is formed in the opening periphery of the side wall 6.

  The electrical connection box 1 according to the first embodiment is provided on the assembly surface of the actuator, for example, as shown in FIGS. 11 (a) and 11 (b) through a packing attached to the groove 8 on the peripheral edge of the opening of the side wall 6. It can be attached by the fastening portion 4 via the screw 101. That is, the fastening part 4 has fastening parts 4 a and b formed at the corners of the case 2 and fastening parts 4 c and d formed so as to protrude outward from the side wall 6 of the case 2. A metal collar 10 is embedded in each of the fastening portions 4 a to 4 d, and a through hole 11 having the collar 10 as an inner surface is formed in a direction orthogonal to the base plate 5. Then, a screw (not shown) of the through hole 11 is inserted and screwed into a screw hole provided on the actuator side to fix the electrical connection box 1.

  The feature of the first embodiment is the shape and structure of the fastening portions 4 c and d formed so as to protrude from the side wall 6. The fastening portions 4 c and d have the same shape and structure, and are formed with projecting portions 12 extending along the axial direction of the collar 10 so as to surround the outer circumference of the collar 10. The protrusion 12 is formed in a mountain shape having the same cross section along the extending direction. One end surface 13 in the extending direction of the protruding portion 12, that is, the end surface 13 on the side joined to the actuator side, is formed flush with the opening surface 14 of the side wall 6. In addition, two concave portions 15 a and 15 b that reach the vicinity of the outer periphery of the collar 10 from both side surfaces in the extending direction of the protruding portion 12 are formed.

  As described above, in the first embodiment, the two recessed portions 15a and 15b that reach the vicinity of the outer periphery of the collar 10 from both side surfaces in the extending direction of the protruding portion 12 are formed. Thickness can be almost equalized. Thereby, the thermal deformation at the time of insert molding can be suppressed, and the position accuracy of the through-hole 11 can be improved.

  Moreover, since the recessed part 15a, b for thickness reduction is formed in the both sides | surfaces of the protrusion part 12, and the recessed part is not formed in the end surface 13 by the side of an assembly | attachment, in the salt damage test etc., the recessed part 15a, b Even if salt crystals accumulate, the risk of the accumulated salt crystals entering the case 2 from the packing can be avoided. Thereby, inconveniences, such as airtight fall by salt damage, can be prevented.

Although Embodiment 1 demonstrated as what was applied to the electrical junction box as an example of assembly | attachment components, it cannot be overemphasized that this invention is applicable not only to an electrical junction box but a control unit.
(Embodiment 2)
With reference to FIGS. 6-10, other embodiment of the electrical-connection box of this invention is described. FIGS. 6 and 7 are configuration diagrams of the electrical junction box according to the second embodiment. FIG. 6 (A) is a plan view of the electrical junction box, (B) is a top view, and (C) is a right side view. . FIG. 7 is a rear view of the electrical junction box. 8 is a cross-sectional view taken along arrow VIII-VIII in FIG. 6B, FIG. 9 is a cross-sectional view taken along arrow IX-IX in FIG. 6A, and FIG. 10 is FIG. It is arrow sectional drawing seen from arrow XX of.

  The second embodiment is different from the first embodiment in that the two through holes 16a and 16b are formed along the extending direction, connected to the recessed portions 15a and 15b of the protruding portion 12.

  According to the second embodiment, the resin thickness of the protrusion 12 can be further equalized, so that the positional accuracy of the through hole 11 can be further increased. In this case, the through holes 16a, b connected to the recessed portions 15a, 15b open to the end surface 13 formed flush with the opening surface. In the salt damage test, the recessed portions 15a, b or the through holes 16a, b Even if salt crystals are generated in the inside, since the space for storing salt is wide, it is possible to avoid the possibility that the salt crystals enter the case from the packing portion, and it is possible to prevent inconveniences such as a decrease in airtightness due to salt damage.

  In the first and second embodiments, it has been described that the recessed portions 15a and 15b or the through holes 16a and 16b are formed in the protruding portion 12 formed to protrude outward from the side wall 6. Also for the fastening portions 4a, b to be molded, the same recessed portions 15a, b or through holes 16a, b as in the first and second embodiments may be formed.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram of the electrical junction box of Embodiment 1 of this invention is shown, (A) is a top view of an electrical junction box, (B) is a top view, (C) is a right view. It is a rear view of the electrical junction box of Embodiment 1. It is arrow sectional drawing seen from the arrow III-III of FIG. 1 (B). It is arrow sectional drawing seen from arrow IV-IV of FIG. 1 (A). It is arrow sectional drawing seen from the arrow VV of FIG. 1 (A). The block diagram of the electrical junction box of Embodiment 2 of this invention is shown, (A) is a top view of an electrical junction box, (B) is a top view, (C) is a right view. It is a rear view of the electrical junction box of Embodiment 2. It is arrow sectional drawing seen from arrow VIII-VIII of FIG. 6 (B). It is arrow sectional drawing seen from arrow IX-IX of FIG. 6 (A). It is arrow sectional drawing seen from arrow XX of FIG. 6 (A). It is a figure explaining an example which attaches an electric junction box to an actuator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrical junction box 2 Case 3 Electrical circuit 4 Fastening part 5 Base plate 6 Side wall 7 Terminal 8 Groove 10 Collar 11 Through-hole 12 Projection part 13 End surface 14 Opening surface 15a, b Recessed part 16a, b Through-hole

Claims (3)

A case made of a synthetic resin having a base plate on which an electric circuit is formed and a side wall formed upright on the peripheral portion of the base plate, and a metal collar formed on the opening peripheral portion of the case The fastening portion having the attached through hole and the packing disposed on the opening periphery of the side wall of the case are assembled to the assembly target, and a screw is inserted into the through hole of the fastening portion to be fixed to the assembly target. Assembly parts,
Wherein the fastening portion comprises at concluded portion formed to protrude outward from the side wall of the case, concluded portion formed to protrude outward from the side wall of the case along the axial direction of the collar A projecting portion extending to surround the outer periphery of the collar of the collar, and one end surface of the projecting portion in the extending direction is formed flush with the opening surface of the side wall, and the extending direction of the projecting portion; An assembly part, wherein recesses reaching the outer periphery of the collar from both side surfaces of the collar are formed. The assembly part according to claim 1,
The projecting part is further connected to the recessed part, and a through hole is formed along the extending direction.   The assembly component according to claim 1 or 2, wherein the assembly component is an electrical junction box formed by insert molding a conductive member constituting an electrical circuit.

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