JP2011045158A - Mounting structure of electrical junction box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently carry out two work operations of passing a wiring harness, led out of an electrical junction box, through a hole in a panel and fixing the electrical junction box in a vehicle, or the like, with less number of man-hours. <P>SOLUTION: A wiring harness 11 led out of an opening portion 3, 35 in an electrical junction box body 2, 32 is inserted into a hole 8 in a panel 7. The opening portion is provided with a fixing member 4, 26, 33, and the electrical junction box body is fixed in the panel with the fixing member. The fixing member is an elastic grommet 4, 26. The hole 8 in the panel 7 is fixed on the tip side of the grommet, and the opening portion 3 of the electrical junction box body 2 is fixed on the base side of the grommet. The portion of the grommet 26 on the tip side is inserted into the hole in the panel 7 and folded back, and the hole in the panel is fit and fixed between the folded-back portion 27 and an annular wall 16 at the intermediate portion of the grommet; the fixing member is a hard lock cap 33 and the lock cap includes a female threaded portion 39 or a guide portion 47; and the cylindrical opening portion 35 of the electrical junction box body 32 is provided with a male-threaded portion 38 or a driven portion 45. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric junction box mounting structure that penetrates a wire harness to an automobile panel and fixes an electric junction box, for example.

  FIG. 9 shows an embodiment of a conventional electrical junction box mounting structure.

  In this structure, a main fuse box 71 as an electrical connection box is disposed in an engine room of an automobile, and a metal dash panel 73 that separates the wire harness 72 led out from the main fuse box 71 from the engine room and the vehicle compartment. A waterproof grommet 74 made of synthetic rubber and fixed to the outer periphery of the wire harness 72 is fitted and fixed to the hole of the panel 73.

  10 to 12 show examples of grommets (refer to Patent Document 1 for FIGS. 10 to 11 and Patent Document 2 for FIG. 12).

  A grommet 81 in FIG. 10 includes a large-diameter cup-shaped portion 82 and a small-diameter cylindrical portion 83, and has a circumferential groove 85 that fits in the hole of the panel 84 on the outer periphery of the cup-shaped portion 82. . With the wire harness 86 inserted and fixed in the grommet 81, the cylindrical portion 83 side is pulled as shown by the arrow to fit the circumferential groove 85 into the hole portion of the panel 84.

  The grommet 87 in FIG. 11 is radially radiated from the outer peripheral surface of the large-diameter cup-shaped portion 88, the small-diameter cylindrical portion 89, and the cup-shaped portion 88 to the opposite side of the cylindrical portion 89 as shown in FIG. This is composed of a plurality of protruding pressing pieces 90.

  As shown in FIG. 11A, the wire harness 92 is inserted into the hole portion of the panel 91 and fixed to the tubular portion 89 in a state where the presser piece 90 is inverted together with the cup-like portion 88 toward the tip end of the grommet. By pulling in the direction of the arrow, the cup-shaped portion 88 and the holding piece 90 are restored from the outer peripheral surface of the cup-shaped portion 88, and the cup-shaped portion 88 is inserted into the hole of the panel 91 as shown in FIG. The outer circumferential groove is fitted, and the pressing piece 90 is elastically adhered (pressed) to the panel surface.

  The grommet 93 in FIG. 12 protrudes in a direction opposite to the cylindrical portion 95 through the cup-shaped portion 94, the large-diameter cup-shaped portion 94, the distal-end-side medium-diameter cylindrical portion 95, as shown in FIG. The small-diameter cylindrical portion 96 and a plurality of flanges 97 projecting radially from the outer peripheral surface of the cup-shaped portion 94 in the direction of the cylindrical portion 95.

  As shown in FIG. 12 (a), with the flange portion 97 inverted to the grommet tip side together with the cup-shaped portion 94, the flange portion 97 is inserted into the hole of the panel 98, and the medium-diameter cylindrical portion 95 is moved in the direction of the arrow. The cup-shaped portion 94 and the flange portion 97 are restored starting from the flange portion 97, and the peripheral groove on the outer periphery of the cup-shaped portion 94 is fitted into the hole portion of the panel 98 as shown in FIG. The flange portion 97 is protruded from the panel 98 toward the medium diameter cylindrical portion.

  As a device mounting structure (not shown) using grommets, Patent Document 3 discloses that an air conditioning case made of a synthetic resin of an automobile is provided with a hole in a dash panel at the boundary between an engine room and a vehicle compartment via an accordion-shaped grommet. It is described that an air conditioning unit is constituted by an air conditioning case and an evaporator in the case, and a fluid (refrigerant) pipe following the evaporator is passed through the engine room through the grommet.

  Further, Patent Document 4 discloses that a lock cover made of synthetic rubber is disposed on the outer periphery of a fuel lid locking actuator without using a grommet, and the waterproof cover is in close contact with the inner panel of the vehicle. It is described that the tip end portion of the actuator that has penetrated through is fastened and fixed to the inner panel by a fastening member.

Japanese Patent Laid-Open No. 8-212857 (FIGS. 2 and 3) JP 2001-197638 A (FIGS. 2 and 3) Japanese Patent Laying-Open No. 2004-66926 (FIG. 1) JP 2006-183421 A (FIG. 1)

  In the conventional electrical junction box mounting structure shown in FIG. 9, the main fuse box 71 must be fixed to the vehicle body with the bolt 75, and the grommet 74 must be fixed to the dash panel 73 through a separate process. Therefore, there is a problem in that work efficiency is low, and a long wire harness 72 is required between the grommet 74 and the main fuse box 71, and a protector 76 for protecting the wire harness 72 is also required, resulting in high costs. there were.

  Moreover, in the attachment structure of the apparatus of patent document 3, the attachment position error of an air conditioning unit is absorbed by connecting between an air conditioning unit and a dash panel using a bellows-like grommet, Because the unit is heavy, the air conditioning unit must be firmly fastened and fixed to the dash panel, and the flexible bellows-shaped grommet cannot support the air conditioning unit at all, and it takes a lot of work to fix the air conditioning unit. There was a concern that it would require.

  Moreover, in the attachment structure of the apparatus of patent document 4, a wire harness cannot be penetrated to a panel hole, but a structure and the objective differ from the attachment structure of an electrical junction box.

  In view of the above-described points, the present invention allows a wire harness led out from a relatively lightweight electrical connection box such as a main fuse box to pass through a hole in a panel of a vehicle or the like, and fixes the electrical connection box to the vehicle or the like. It is an object of the present invention to provide an electrical junction box mounting structure that can efficiently perform two operations with less man-hours.

  In order to achieve the above object, the electrical junction box mounting structure according to claim 1 of the present invention is such that the wire harness led out from the mouth portion of the junction box body is inserted into the hole portion of the panel, and a fixing member is inserted into the mouth portion. And the junction box body is fixed to the panel by the fixing member.

  With the above configuration, the wire harness led out from the connection box main body is inserted (penetrated) into the hole of the panel, and then continuously, the connection box main body is moved in the insertion direction of the wire harness toward the panel. The junction box body is fixed to the panel. The junction box body smoothly approaches the hole of the panel using the wire harness as a guide. The fixing member is preferably an insertion fitting type waterproof grommet or a rotation fixing type lock cap.

  The electrical junction box mounting structure according to claim 2 is the electrical junction box mounting structure according to claim 1, wherein the fixing member is an elastic grommet, and a hole of the panel is fixed to a front end side of the grommet. The mouth of the junction box body is fixed to the base end side of the grommet.

  With the above configuration, the grommet fixed to the connection box body is inserted and fitted into the hole of the panel while the connection box body is moved toward the panel. The grommet also acts as a sealing member that closes the hole of the panel and the mouth of the junction box body.

  The electrical junction box mounting structure according to claim 3 is the electrical junction box mounting structure according to claim 2, wherein the grommet includes a tip inclined wall, an intermediate annular wall, a base end flange, and the inclined wall. A circumferential groove on the distal end side sandwiched between the annular walls and a circumferential groove on the proximal end side sandwiched between the annular wall and the flange portion, and the hole portion of the panel is formed in the circumferential groove on the distal end side. The mouth of the junction box body is fitted in the peripheral groove on the base end side.

  According to the above configuration, the grommet is formed with a short and high rigidity without the bellows portion, so that the fixing strength of the connection box body to the hole of the panel by the grommet is increased, and the weight of the connection box main body is increased. Grommet bending is minimized.

  The electrical junction box mounting structure according to claim 4 is the electrical junction box mounting structure according to claim 2, wherein a tip side portion of the grommet is inserted through the hole of the panel and folded, and the folded portion and A hole of the panel is fitted and fixed between the annular wall of the grommet.

  With the above configuration, the folded part of the grommet is elastically pressed against the panel, and the junction box body is firmly fixed to the panel, and the grommet is pulled out from the hole, that is, the junction box body is detached from the panel. Blocked in the department.

  The electrical junction box attachment structure according to claim 5 is the electrical junction box attachment structure according to claim 1, wherein the fixing member is a hard lock cap, and the lock cap has a female screw portion or a guide portion, The cylindrical mouth portion of the connection box body is provided with a male screw portion that engages with the female screw portion or a driven portion that engages with the guide portion. The panel is sandwiched between the junction box body.

  With the above configuration, after the wire harness is inserted into the hole of the panel, the cylindrical mouth portion of the connection box body is continuously inserted into the hole portion, and the lock cap is fitted into the mouth portion, and the connection box body Is fixed to the panel.

  The electrical junction box mounting structure according to claim 6 is the electrical junction box mounting structure according to claim 5, wherein a sealing member is sandwiched between the panel and the junction box body.

  With the above configuration, the seal member is compressed by fitting the lock cap into the mouth portion of the junction box body, and the entry of water or the like from the junction box body side into the panel is prevented by the seal member.

  According to the first aspect of the present invention, after the wire harness is inserted into the hole of the panel, the electrical connection box is continuously moved in the insertion direction of the wire harness, so that the fixing member has less workability on the panel. Can be fixed in man-hours.

  According to the second aspect of the present invention, the grommet can be pressed in the insertion direction of the wire harness and can be fitted and fixed smoothly into the hole of the panel.

  According to the third aspect of the present invention, since the grommet has a high rigidity and less bends, the electrical junction box can be firmly fixed to the panel, and the deflection of the electrical junction box during traveling of the vehicle can be kept small. .

  According to the fourth aspect of the present invention, the electrical junction box can be firmly fixed to the panel at the folded back portion of the grommet, and separation of the electrical junction box from the panel can be prevented.

  According to the fifth aspect of the present invention, the electric junction box can be firmly fixed to the hole of the panel with the lock cap having high rigidity.

  According to the sixth aspect of the present invention, the lock cap can be fitted into the opening of the junction box body, and at the same time, the sealing member can prevent the entry of water or the like from the junction box body side into the panel.

It is the top view which made the principal part the cross section which shows 1st embodiment of the attachment structure of the electrical junction box which concerns on this invention. It is a disassembled perspective view which similarly shows one form of the attachment structure of a grommet. It is the top view which made the principal part which shows 2nd embodiment of the attachment structure of an electrical junction box the cross section. It is the top view which made the principal part which shows 3rd embodiment of the attachment structure of an electrical junction box the cross section. It is a perspective view which shows one form of the attachment structure of the lock cap in 3rd embodiment. FIG. 4 is a perspective view showing one embodiment of the lock cap, in which (a) is a divided state and (b) is a joined state. It is a perspective view which shows the other form of the attachment structure of the lock cap in 3rd embodiment. FIG. 4 is a perspective view showing one embodiment of the lock cap, in which (a) is a divided state and (b) is a joined state. It is a perspective view which shows one form of the attachment structure of the conventional electrical junction box. It is a top view which shows one form of the conventional grommet. (A) (b) is the top view which made the cross section the principal part which shows the other form of the conventional grommet in order of attachment. (A) (b) is sectional drawing which shows the other form of the conventional grommet in order of attachment.

  FIG. 1 shows a first embodiment of an electrical junction box mounting structure according to the present invention.

  This structure is made of an elastic resin made of synthetic rubber in a hole (mouth) 3 of an insulating resin box main body (junction box main body) 2 of a main fuse box (electric connection box) 1 arranged in an engine room 5 of an automobile. A waterproof grommet (fixing member) 4 is attached, and the grommet 4 is fitted and fixed in the hole 8 of the metal dash panel 7 at the boundary between the engine room 5 and the vehicle compartment 6, and the bracket 9 of the main fuse box 1. Is fixed to the vehicle body 10 on the engine room side by screw fastening couplings 11 and 12.

  The main fuse box 1 is for the purpose of distributing power to the vehicle, and has an electrical component (not shown) such as a box-shaped fusible link (large fuse) and a blade-type small fuse, and is compact and lightweight. Has been. The electric wires 11a for load connection are connected to these fuses via terminals, bus bars or the like (not shown), and the wire harness 11 is constituted by a plurality of electric wires 11a. An electric wire (not shown) from a battery (not shown) in the engine room is connected to a large fuse (not shown).

  These fuses, terminals, bus bars and the like are accommodated in a box body 2 made of insulating resin, and the box body 2 is divided into an upper cover and a lower cover (not shown), for example, a vertical rear wall (one wall portion) of both covers. ) 12 is provided with a half-divided divided hole, and the two divided holes are joined to form a circular hole 3, and the front end 13 of the grommet 4 is fitted and fixed to the hole 3. In the specification, “front and rear” are made to coincide with the front and rear direction of the vehicle.

  For example, as shown in an example of the fixing structure of the grommet 4 in FIG. 2, the grommet 4 through which the wire harness 11 is inserted is fixed by sandwiching the grommet 4 between the lower cover (base) 14 and the upper cover (lid) 15 of the box body 2. 2 are large on the lower cover 14 side and small on the upper cover 15 side. The upper cover 15 is locked to the lower cover 14 by locking means (not shown) such as a flexible locking frame and an engaging protrusion. The shape of the box body 2 and the shapes of the divided holes 3a and 3b can be set as appropriate.

  In the example of FIG. 1, it is possible to fit the grommet 4 to the circular hole (3) provided in the lower cover 14 without using the divided holes 3a and 3b while reducing the diameter (however, the workability is poor). The main fuse box 1 in FIG. 1 is similar to the main fuse box 71 in FIG. 9 of the conventional example.

  The grommet 4 in the example of FIG. 1 has a relatively high rigidity, does not have a bellows part, has a front collar part (front end part) 13, an intermediate annular wall 16, a rear umbrella-shaped inclined wall 17, and a collar. The front circumferential groove 18 between the portion 13 and the annular wall 16 and the rear circumferential groove 19 between the annular wall 16 and the inclined wall 17 are configured. The flange portion 13 has a larger diameter than the annular wall 16, and the inclined wall 17 has a tapered inclined surface 17 a on the tip side and has an outer diameter comparable to that of the annular wall 16. The flange 13, the annular wall 16, and the inclined wall 17 are formed so as to protrude outside the annular (cylindrical) peripheral wall 20, and a harness insertion space 21 having a circular cross section is formed inside the peripheral wall 20.

  With the upper cover (reference numeral 15 in the example of FIG. 2) of the box body 2 opened, the lower half side of the circumferential groove 18 on the front side of the grommet 4 is placed on the vertical rear wall 12 of the lower cover (reference numeral 14 in the example of FIG. 2). The upper cover (15) is closed by being inserted into and engaged with the divided hole (3a in the example of FIG. 2), and the grommet is inserted into the divided hole (3b in the example of FIG. 2) of the vertical rear wall 12 of the upper cover (15). The upper half side of the front circumferential groove 18 of 4 is inserted and engaged. The front peripheral groove 18 fits closely into the hole 3 of the box body 2 without a gap (in FIG. 1, a gap is shown for convenience). The wire harness 11 is inserted through the grommet 4 in advance before being fitted into the hole 3. In this state, the main fuse box 1 with the grommet 4 is configured.

  In the state of the main fuse box 1 with the grommet 4, the inclined wall 17 at the rear end (front end) of the grommet 4 is pushed into the circular hole 8 of the vertical dash panel 7 in the axial direction as indicated by the arrow A, and the rear side The circumferential groove 19 is closely fitted into the panel hole 8 without any gap (in FIG. 1, the gap is shown for convenience). The inclined surface 17a on the front end side of the inclined wall 17 is smoothly slidably brought into contact with the peripheral edge of the panel hole 8 when pushed in, thereby facilitating the engagement of the circumferential groove 19 with the panel hole 8.

  The pushing operation of the grommet 4 into the panel hole 8 is performed by the operator holding the main fuse box 1 by hand and pushing it toward the panel hole 8. At that time, the front end face 16a of the annular wall 16 abuts against the rear wall 12 of the box body 2 to prevent the grommet 4 from entering the box body. After the circumferential groove 19 on the rear side of the grommet 4 is fitted into the panel hole 8, the rear wall 12 of the box body 2 comes into contact with the rear surface 13 a of the flange 13, and the main fuse box 1 is detached from the grommet 4 ( Withdrawal) is prevented.

  The panel 7 and the rear wall 12 of the box body 2 are preferably fitted in the circumferential grooves 18 and 19 without a gap in the front-rear direction (plate thickness direction). Thereby, the downward bending of the grommet 4 is suppressed, and the main fuse box 1 is firmly supported (fixed) on the panel 7 by the grommet 4.

  The wire harness 11 is preferably fixed to a cylindrical portion (not shown) having a small diameter (smaller than the circumferential groove 19) extending from the tip of the grommet 4 by tape winding or the like.

  In the example of FIG. 1, the main fuse box 1 is supplementarily fixed to the vehicle body 10 by a bracket 9 in addition to the grommet 4. In this example, a substantially vertical bracket 9 is integrally provided on a vertical front wall 22 of the box body 3, and a bolt 11 is horizontally fixed by welding to a substantially vertical wall portion 24 of a suspension tower 23 of the vehicle body 10. 9 is inserted into the bolt 11 as shown by an arrow B, and the nut 12 is screwed into the bolt 11, and the bracket 9 is fastened to the wall portion 24 of the vehicle body 10 with the nut 12.

  Instead of welding the bolt 11, the nut 12 can be welded to the vehicle body 10, and the bolt 11 can be screwed into the nut 12 through the hole 25 of the bracket 9 from the side. The direction of the bracket 9, the direction of the wall portion (22) of the box body 2 on which the bracket 9 is provided, the protruding direction of the bolt 11, and the like can be set as appropriate. If the grommet 4 and the panel 7 are firmly fixed, the bracket 9 can be eliminated.

  Further, the grommet 4 can be integrally provided on the box body 2 by insert molding or the like. In this case, the flange 13 on the front side of the grommet 4 and the intermediate annular wall 16 are fixed to the rear wall 12 of the box body 2. The same applies to the embodiment of FIG.

  FIG. 3 shows a second embodiment of the electrical junction box mounting structure according to the present invention.

  This structure eliminates the bracket 9 of the main fuse box 1 in the example of FIG. 1 and fixes the main fuse box 1 to the dash panel 7 of the vehicle only with a synthetic rubber grommet (fixing member) 26.

  The grommet 26 of this example has a collar portion 27 like a chain line on the tip side, and after inserting the collar portion 27 into the panel hole 8, it is folded back (restored) as a folded portion 27 like a solid line. 7, the fixing force of the main fuse box 1 to the panel 7 is increased.

  As the folded structure of the folded portion 27 of the grommet 26, for example, the structure of the pressing piece 90 of the grommet 87 shown in FIG. 11 of the conventional example or the structure of the flange 97 of the grommet 93 shown in FIG.

  That is, on the outer surface of the cylindrical peripheral wall 28 of the grommet 26 in FIG. 3, a plurality of pressing pieces 90 inclined forward as shown by solid lines in the free state of FIG. The holding piece 90 (folded portion 27) is inserted into the panel hole 8 in a state where the holding piece 90 (folded portion 27) is reversed backward as shown by a chain line in FIG. 3, and the holding piece 90 (folded portion 27) is elastically moved forward by a restoring force as indicated by a solid line. And restored to the panel rear surface 7a.

  Alternatively, on the outer surface of the cylindrical peripheral wall 28 of the grommet 26 in FIG. 3, a plurality of flanges 97 inclined rearward as shown by solid lines in the free state in FIG. In the state where the collar portion 97 (folded portion 27) is reversed as shown by the chain line in FIG. 3, it is inserted into the panel hole 8 and the collar portion 97 (folded portion 27) is moved forward by a restoring force as indicated by a solid line. And elastically restored to the base panel rear surface 7a of the collar portion 97 (folded portion 27).

  In FIG. 12 of the conventional example, the flange portion 97 is inclined rearward in a free state. However, as shown in FIG. 3, the folded portion 27 of the grommet 26 protrudes forward in the free state so as to be inclined. It is preferable that the protruding front end side of 27 is pressed against the rear surface 7 a of the panel 7.

  The front end portion (rear end portion) of the peripheral wall 28 of the grommet 26 is inserted into the panel hole 8 without forming the return portion 27 of the grommet 26, and then the front end portion of the peripheral wall 28 is turned back with a jig (not shown). It is also possible to fold it back and press it against the rear surface 7a of the panel 7 (however, the folding operation is troublesome and there is a concern that the folding portion (27) is restored to the rear and the folding is released).

  In FIG. 3, a rear peripheral groove 19 is provided between the folded portion 27 of the grommet 26 and the intermediate annular wall 16, and a front peripheral groove 18 is provided between the annular wall 16 and the front flange 13. It has been. The folded portion 19, the annular wall 16, and the front flange 13 protrude radially from the annular peripheral wall 28, and a harness insertion space 21 having a circular cross section is formed inside the peripheral wall 28.

  The hole (mouth) 3 of the rear wall 12 of the box body 2 is fitted and fixed in the circumferential groove 18 on the front side of the grommet 26 without any gap. In this state, the main fuse box 1 is pushed rearward, and the tip of the grommet 26 By inserting the (rear end portion) into the panel hole 8, the panel hole 8 is firmly fitted and fixed to the rear circumferential groove 19 without a gap. Thereby, the bracket 9 of the main fuse box 1 of FIG. 1 becomes unnecessary. In FIG. 3, the configuration other than the grommet 26 is the same as that in the example of FIG. 1, and thus the same components are denoted by the same reference numerals and description thereof is omitted.

  The wire harness 11 is preferably fixed to a cylindrical portion (not shown) having a small diameter (smaller than the circumferential groove) extending from the tip of the grommet 26 by tape winding or the like.

  FIG. 4 shows a third embodiment of the electrical junction box mounting structure according to the present invention.

  In this structure, the box body 32 made of insulating resin of the main fuse box (electrical connection box) 31 is fastened and fixed to the hole 8 of the dash panel 7 with a lock cap (fixing member) 33 made of synthetic resin without using a grommet. In addition, the box main body 32 is tightly waterproofed to the dash panel 7 through an O (O) ring (seal member) 34 made of synthetic rubber around the panel hole 8.

  The box main body 32 has a cylindrical portion (mouth) 35 on the rear wall 12, and the cylindrical portion 35 has a harness insertion space 36 communicating with the inside of the box main body 32, and an intersection of the circular hole portion 35 and the rear wall 12. Is formed with a hole 36a for leading out the harness, the cylindrical portion 35 is passed through the hole 8 in the dash panel 7, and the wire harness 11 is led out from the box body 32 through the cylindrical portion 35 to the vehicle compartment 6 side. Yes. For example, the wire harness 11 is preferably fixed to a spatula portion (not shown) extending from the tip of the cylindrical portion 35 by tape winding or the like.

  A lock cap 33 is disposed on the outer peripheral side of the cylindrical portion 35. The lock cap 33 is coupled to the cylindrical portion 35 by screw coupling or cam fitting, and the front end surface 33a of the lock cap 33 is pressed against the rear surface 7a of the panel 7. The box body 32 is pulled rearward and the O-ring 34 is compressed and is sandwiched between the panel 7 and the rear wall 12 of the box body 32.

  The peripheral edge 8a of the panel hole 8 is bent in a short cylindrical shape toward the rear, and an escape notch groove 37 is provided on the inner peripheral front end side of the lock cap 33 with respect to the bent portion 8a, and the inner surface of the bent portion 8a is provided. The outer surface of the cylindrical portion 35 of the box body 32 is guided along and is stably supported. Since the configuration other than the panel hole 8, the cylindrical portion 35, the lock cap 33, and the O-ring 34 is the same as that in the example of FIG.

  5 to 8 show various forms for fastening the cylindrical portion 35 of the box body 32 with the lock cap 33. FIG. Although the shape of each lock cap 33 is different, the same reference numerals will be used for convenience.

  In the example of FIG. 5, a male screw portion (thread) 38 is formed on the outer periphery of the cylindrical portion 35 of the box body 32, and a female screw portion 39 is formed on the inner peripheral surface of the cylindrical peripheral wall 46 of the lock cap 33. The cap 33 is screwed and coupled to the cylindrical portion 35 as indicated by an arrow C.

  The box main body 32 includes a lower cover (base) 40 and an upper cover (lid) 41. A cylindrical portion 35 projects from the vertical rear wall 12 of the lower cover 40, and an O-ring 34 is disposed outside the cylindrical portion 35 on the outer surface of the rear wall 12. The main fuse box 31 is firmly fixed to the panel 7 without rattling while the O-ring 34 is in close contact with the wall 12 and the front surface 7 b of the panel 7.

  As shown in FIGS. 6 (a) and 6 (b), the lock cap 33 is divided into two parts so that the lock cap 33 is assembled to the cylindrical portion 35 in the radial direction (the pair of divided caps 33A and 33B are mounted on the outer peripheral surface of the cylindrical portion 35). By engaging the pair of split caps 33A and 33B with each other while being attached, the number of screwing steps can be reduced.

  Locking is performed by engagement of a flexible locking piece 42 provided on one split cap 33A and a protrusion 43 provided on the other split cap 33B. Instead of these locking means, claw pieces (not shown) projecting on the dividing surface 44 of one dividing cap 33A, engaging grooves provided on the dividing surface 44 of the other dividing cap 33B, etc. (not shown) It is also possible to use. The female screw portions 39 of both split caps 33A and 33B are joined together to form a complete female screw.

  Of course, the lock cap 33 can be formed in a cylindrical shape without being divided, or it can be screwed in from the front end (rear end) of the cylindrical portion 35 in the axial direction even in the divided type. The male screw portion 38 and the female screw portion 39 are not limited to one but may be two. The lock cap 33 may be made of metal.

  In the example of FIG. 7, a pair of left and right short cylindrical bosses 45 project from the outer surface of the cylindrical portion 35 of the box body 32, and a pair of left and right hook-shaped guide slits (guides) are formed on the cylindrical peripheral wall 46 of the lock cap 33. Part) 47 is formed, and the boss (driven part) 45 is fitted into the guide slit 47 while the lock cap 33 is inserted and rotated with respect to the cylindrical part 35. The configurations of the box body 32 and the O-ring 34 are the same as those in the example of FIG.

  As shown in FIGS. 8A and 8B, the lock cap 33 of this example is divided into two parts, and guide slits 47 are provided symmetrically in each of the divided caps 33A and 33B, and each guide slit 47 has a straight portion 47a in the axial direction. And a bent portion 47b in the circumferential direction. The bent portion 47b may be slightly inclined in the extending direction of the straight portion 47a (this can ensure locking without loosening). The guide slit 47 may be called a cam hole, and the boss 45 may be called a driven projection. Instead of the guide slit 47, it is also possible to provide a guide groove (guide portion) on the inner peripheral surface side of each divided cap 33A, 33B.

  The straight portion 47a of the guide slit 47 is inserted into the cylindrical portion 35 of FIG. 7 in the state of the lock cap 33 in which both split caps 33A and 33B are combined and locked by the locking means 42 and 43. The boss 45 is slidably engaged, and then the lock cap 33 is rotated clockwise (right) as indicated by an arrow C, and the bent portion 47 b is engaged and locked with the boss 45. Alternatively, in a state where the lock cap 33 is divided, the lock cap 33 is assembled to the outer periphery of the cylindrical portion 35 in FIG. 7 in the radial direction, and the bosses 45 are inserted into the end of the straight portion 47a of the guide slit 47, and the lock cap 33 is combined. The boss 45 is engaged and locked to the bent portion 47b by rotating clockwise. In any case, the rotation angle of the lock cap 33 is preferably about 90 ° in order to improve the fixing property.

  The reason why the lock cap 33 is divided is mainly to improve the resin moldability. If the resin molding is possible, the lock cap 33 may be formed integrally instead of the divided type. At the same time that the boss 45 engages with the bent portion 47 b of the guide slit 47, the O link 34 is compressed and press-contacted closely between the panel 7 and the rear wall 12 of the box body 32. Thereby, the main fuse box 31 is firmly fixed to the panel 7 without rattling.

  6 and 8, the relief groove 37 (FIG. 4) inside the front end of the lock cap 33 is not shown. In FIG. 4, it is also possible to eliminate the escape groove 37 and the bent portion 8a.

  The shape of the guide slit 47 can be curved like a cam groove. Further, instead of the O-ring 34, a sheet-like elastic packing (seal member) such as sponge or rubber can be disposed between the panel 7 and the box body 32. The packing is preferably fixed to the rear wall 12 of the box body 32 around the cylindrical portion 35 by bonding or the like. The O-ring 34 may be prevented from falling off as an inner diameter that fits around the outer periphery of the cylindrical portion 35.

  When the main fuse box 31 is disposed not in the engine room 5 but in a trunk room (luggage room) or the like that does not require waterproofing, a seal member such as an O-ring 34 is not necessary, and an elastic member such as urethane is used instead of the seal member. The rear wall 12 of the box body 32 is pressed against the panel 7 via the panel 7 or the rear wall 12 of the box body 32 is bulged outward without using an elastic member, and the bulged portion or the rear wall 12 is It is also possible to press the panel 7 directly.

  In each of the above embodiments, the main fuse box 1 or 31 is used as the electrical connection box. However, in addition to the main fuse box, a small relay box, fuse box, ECU box, or the like is used as the electrical connection box. It is also possible. The installation location of the electrical junction box is not limited to the engine room 5, and any location can be used as long as the compartment 6 and the installation location are partitioned by the panel (7).

  Moreover, the structure of each above-mentioned embodiment is effective also as an attachment method of an electric junction box other than as an attachment structure of an electric junction box.

  The mounting structure of the electrical junction box according to the present invention includes, for example, an electrical junction box that is easily and inexpensively fixed to a panel that partitions an automobile engine room, luggage room, etc. Can be used to route

1,31 Main fuse box (electrical connection box)
2,32 Box body (Connection box body)
3 holes (mouth)
4,26 Grommet (fixing member)
7 Dash panel (panel)
8 hole portion 11 wire harness 13 flange portion 16 annular wall 17 inclined wall 18, 19 circumferential groove 27 folded portion 33 lock cap (fixing member)
34 O-ring (seal member)
35 Cylindrical part (mouth)
38 Male thread part 39 Female thread part 45 Boss (driven part)
47 Guide slit (guide part)

Claims (6)

  A wire harness led out from a mouth portion of the junction box body is inserted into a hole portion of the panel, a fixing member is provided in the mouth portion, and the junction box body is fixed to the panel by the fixing member. Electric junction box mounting structure.   The fixing member is an elastic grommet, a hole portion of the panel is fixed to a distal end side of the grommet, and the mouth portion of the junction box body is fixed to a proximal end side of the grommet. Item 3. An electrical junction box mounting structure according to Item 1.   The grommet is sandwiched between the inclined wall at the distal end, the intermediate annular wall, the flange at the proximal end, the peripheral groove on the distal end sandwiched between the inclined wall and the annular wall, and the annular wall and the flange. A peripheral groove on the base end side, the hole of the panel is fitted in the peripheral groove on the tip side, and the mouth of the junction box body is fitted in the peripheral groove on the base end side. The mounting structure for an electrical junction box according to claim 2.   A portion on the tip side of the grommet is inserted through the hole of the panel and folded, and the hole of the panel is fitted and fixed between the folded portion and an intermediate annular wall of the grommet. The mounting structure of the electrical junction box according to claim 2.   The fixing member is a hard lock cap, the lock cap has a female screw part or a guide part, and the male screw part or the guide part screwed into the female screw part into the cylindrical mouth part of the connection box body 2. The electrical connection according to claim 1, wherein a driven portion that engages with the lock cap is provided, and the panel is sandwiched between the lock cap and the junction box body by a rotation operation of the lock cap. Box mounting structure.   6. The electrical junction box mounting structure according to claim 5, wherein a seal member is sandwiched between the panel and the junction box body.

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