JP2011078264A - Fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure which fixes a part to be fixed certainly to a panel even if the part is misaligned. <P>SOLUTION: The fixing structure 1 is equipped with: a panel 3 consisting of a metal and through which a hole 4 penetrates; a nut 5 which is fixed onto one surface 3a of the panel 3 in a state where a screw hole 6 is communicating with the hole 4; a portion to be fixed 15 consisting of resin and superimposed on the other surface 3b of the panel 3 in a state where a through hole 16 provided therein is communicating with the hole 4; a bolt 17 which is driven into the screw hole 6 of the nut 5 via the through hole 16 and the hole 4; a wedge piece member 20 which is inserted between the through hole 16 and the bolt 17 passed therethrough; and a coupling portion 24 which couples a part to be fixed 15 and the wedge piece member 20 while positioning the wedge piece member 20 on the surface of the part 15 adjacent to the through hole 16. The coupling portion 24 is formed thinner than either of the wedge piece member 20 and the part 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fixing structure for fixing a resin molded product such as a box of an electric connection box mounted on an automobile or the like as a moving body to a panel made of metal.

  In general, automobiles as moving bodies are equipped with a wide variety of electronic devices such as lamps such as head lamps and tail lamps, and motors such as motors for starter motors and air conditioners. And in order to supply electric power and a desired signal to the various electronic devices, the automobile has arranged junction blocks at appropriate places. The junction block is composed of various electric circuit units such as a large number of fuses and relays.

  Note that the junction block may include a fuse, a relay, a bus bar, and the like, and thus is also referred to as a fuse block, a relay box, or an electrical connection box. In the present specification, the above-described fuse block, relay box, and junction block are collectively referred to as an electrical connection box.

  The electrical connection box includes a box body that forms an outer shell and a wiring board accommodated in the box body. Various electrical parts such as the relay and fuse described above are mounted on the box, and the connector of the wire harness routed in the automobile described above is fitted. The wiring board includes a bus bar or the like for connecting the various electrical components and the terminals of the connector of the wire harness according to a predetermined pattern. The electrical junction box distributes the electric power supplied from the power source to various electronic devices mounted on the automobile via the relay, fuse, and wire harness.

  The electric junction box described above is conventionally fixed to the panel by various fixing structures (see, for example, Patent Document 1). The fixing structure shown in Patent Document 1 is provided with a hole provided in the panel and a through hole that is integrally formed with the box of the electrical connection box and is superimposed on the panel and communicates with the hole of the panel. The fixed portion, the nut arranged on one surface of the panel in a state where the screw hole communicates with the hole of the panel, and the through hole of the fixed portion and the hole of the panel are passed through and screwed into the nut. It has a bolt and a collar.

  The panel constitutes the automobile body described above and is made of metal or the like. The to-be-fixed part is comprised with the synthetic resin similarly to the box. The outer diameter of the screw part screwed into the screw hole of the nut of the bolt is formed smaller than the inner diameter of the through hole of the fixed part. The collar is made of a metal or the like, and is formed in a circular tube having an outer diameter equal to the inner diameter of the through hole and an inner diameter equal to the outer diameter of the threaded portion. The collar is inserted into the through hole of the fixed part.

  In the fixing structure having the above-described configuration, after the fixed portion is overlaid on the panel and the collar is inserted into the through hole of the fixed portion, the screw portion of the bolt is the collar, that is, the through hole of the fixed portion and the hole of the panel. Then, the electric connection box is fixed to the panel by sandwiching the fixed portion between the head of the bolt and the panel by being screwed into the screw hole of the nut.

JP-A-5-292628

  However, the fixing structure shown in Patent Document 1 described above is formed of a metal or the like, and is formed in a circular tube having an outer diameter equal to the inner diameter of the through hole and an inner diameter equal to the outer diameter of the threaded portion. By inserting the collar into the through-hole of the fixed part, when the bolt is screwed into the nut, the surroundings of the through-hole of the fixed part are prevented from being crushed (buckling) and connected to the electric machine. The box is securely fixed to the panel. For this reason, the number of parts tends to increase and the number of work steps required to fix the fixed portion to the panel tends to increase.

  Thus, in the fixing structure shown in Patent Document 1 described above, when the bolt is screwed into the nut by the collar inserted into the through hole of the fixed portion, the periphery of the fixed portion around the through hole is fixed. Since this prevents crushing (buckling), there is a problem that the number of parts and work man-hours increase.

  Therefore, in view of the above-described problems, an object of the present invention is to provide a fixing structure that can securely fix a fixed portion to a panel without increasing the number of parts and the number of work steps.

  In order to solve the above-mentioned problem, the fixing structure of the present invention according to claim 1 includes a panel made of metal and provided with a hole, and one surface of the panel in a state where the hole and the screw hole communicate with each other. A nut fixed above, a fixed portion which is made of resin and has a through hole, and is stacked on the other surface of the panel in a state where the through hole communicates with the hole; and the through hole And a fastening member screwed into the screw hole of the nut through the hole, and a wedge member inserted between the through hole and the fastening member passed through the through hole And positioning the wedge member on the surface of the fixed portion adjacent to the through-hole to connect the fixed portion and the wedge member, and more than both the fixed portion and the wedge member. A connecting portion formed thinly; It is characterized by that example.

  A fixing structure according to a second aspect of the present invention is the fixing structure according to the first aspect, wherein the wedge member is formed in a circular tube shape that is inserted into the through hole and through which the fastening member passes. It is characterized by that.

  The fixing structure according to a third aspect of the present invention is the fixing structure according to the second aspect, wherein the wedge member is gradually formed on the inner surface of the wedge member as it approaches the panel from a central portion of the wedge member. A first inclined surface for expanding the inner diameter of the wedge member, and a second inclined surface for gradually increasing the inner diameter of the wedge member as it leaves the panel from the center of the wedge member. Yes.

  A fixing structure according to a fourth aspect of the present invention is the fixing structure according to the third aspect, wherein the inner surface of the wedge member is connected to both the first inclined surface and the second inclined surface and has an inner diameter. It is characterized in that there is provided a fixed surface that is formed to be equal and constant with the fastening member.

  According to the fixing structure of the present invention described in claim 1, since the wedge member inserted between the through hole of the fixed portion and the fastening member passed through the through hole is provided, When the screw member is screwed into the screw hole of the nut, the wedge member supports the fastening member, and the surroundings of the through hole of the fixed portion can be prevented from being crushed (buckled). Moreover, since the wedge member and the fixed portion are connected by the connecting portion, the wedge member can be molded integrally with the fixed portion. Further, since the connecting portion is formed thinner than both the wedge member and the fixed portion, when the fastening member is screwed into the screw hole of the nut, the connecting portion is broken, and the wedge member together with the fastening member is inserted into the through hole. It is press-fitted inside.

  According to the fixing structure of the present invention as set forth in claim 2, since the wedge member is formed in a circular shape that is inserted into the through-hole of the fixed portion and passes the fastening member inside, the fastening member is screwed on the nut. When screwed into the hole, a gap is hardly formed between the inner surface of the through hole of the fixed portion and the fastening member, and the fastening member can be reliably supported by the wedge member, and the periphery of the through hole of the fixed portion is crushed. (Buckling) can be reliably prevented.

  According to the fixing structure of the present invention as set forth in claim 3, since the first inclined surface and the second inclined surface are provided on the inner surface of the wedge member, even if the fixed portion and the panel are slightly displaced. The first and second inclined surfaces can guide the fastening member to the nut.

  According to the fixing structure of the present invention described in claim 4, since the constant surface having a constant inner diameter is provided between the first inclined surface and the second inclined surface of the inner surface of the wedge member, the fastening member is When fastened, a gap is hardly generated between the fastening member and the inner surface of the wedge member.

  As described above, according to the first aspect of the present invention, when the fastening member is screwed into the screw hole of the nut, the fastening member is supported by the wedge member, so that the periphery of the through-hole of the fixed portion. Since it can be prevented from collapsing (buckling), the fixed portion can be securely fixed to the panel without rattling. Further, since the wedge member can be molded integrally with the fixed portion, it is possible to prevent the man-hour and the number of parts required for molding the wedge member from increasing. Further, when the fastening member is screwed into the screw hole of the nut, the connecting portion is broken, and the wedge member is pressed into the through hole of the fixed portion together with the fastening member, so that the fastening member is simply screwed into the screw hole of the nut. The fixed part can be fixed to the panel, and it is possible to prevent an increase in man-hours required for fixing the fixed part to the panel.

  According to the second aspect of the present invention, when the fastening member is screwed into the screw hole of the nut, a gap is not easily generated between the inner surface of the through hole of the fixed portion and the fastening member, and the fastening member is reliably secured by the wedge member. Since the surroundings of the through hole of the fixed part can be reliably prevented from being crushed (buckled), the fixed part can be more securely fixed to the panel.

  According to the third aspect of the present invention, since the fastening member can be guided to the nut by the first and second inclined surfaces even if the fixed portion and the panel are slightly displaced, the fastening member is screwed on the nut. It can be securely screwed into the hole. Therefore, the fixed part can be reliably fixed to the panel.

  According to the fourth aspect of the present invention, when the fastening member is fastened, a gap is not easily formed between the fastening member and the inner surface of the wedge member, so that the fixed portion can be reliably fixed to the panel without rattling.

It is a disassembled perspective view which shows the electrical junction box and panel of the fixed structure which concern on one Embodiment of this invention. It is a perspective view which shows the principal part of the to-be-fixed part provided in the lower cover which comprises the box of the electrical junction box shown by FIG. It is sectional drawing which follows the III-III line | wire in FIG. It is sectional drawing which shows the state in the middle of screwing the volt | bolt of the fixing structure shown by FIG. 1 to a nut. It is sectional drawing which shows the state which screwed further the volt | bolt of the fixing structure shown by FIG. 4 to the nut. FIG. 6 is a cross-sectional view illustrating a state in which the bolt of the fixing structure illustrated in FIG. 5 has been screwed into the nut. FIG. 5 is a cross-sectional view illustrating a state in which a through hole of a fixed portion of the fixing structure illustrated in FIG. 4 and a hole of a panel are displaced.

  Hereinafter, a fixing structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7. As shown in FIG. 1, the fixing structure 1 according to the present embodiment is a structure for fixing an electrical connection box 2 to a panel 3 constituting a vehicle body of an automobile.

  The panel 3 is made of metal, and has a hole 4 through which a threaded portion 19 of a bolt 17 described later passes, as shown in FIG. The hole 4 passes through the panel 3 as a matter of course. A nut 5 (shown in FIG. 4 or the like) is attached to one surface 3a located on the back side of the panel 3 in FIG. The nut 5 is fixed by welding on one surface 3 a of the panel 3 in a state where the screw hole 6 communicates with the hole 4 of the panel 3.

  As shown in FIG. 1 and the like, the electrical junction box 2 includes a box 7 and a wiring board (not shown). As shown in FIG. 1, the box 7 includes a main body portion 8, an upper cover 9, and a lower cover 10.

  The main body 8 is made of an insulating synthetic resin and is molded by a known injection molding. The main body 8 is formed in a cylindrical shape by a plurality of outer walls 11 that are continuous with each other. Electrical parts such as relays and fuses are attached to the upper surface of the main body 8, and a wire harness connector is attached to the lower surface. The wire harness, of course, includes a plurality of electric wires and a connector attached to the end of the electric wires.

  The upper cover 9 is made of an insulating synthetic resin and is molded by a known injection molding. The upper cover 9 includes a plurality of outer walls 12 that are continuous with each other, and is formed in a bottomed cylindrical shape. The upper cover 9 covers the upper side of the main body 8 in FIG. 1 and is attached to the main body 8.

  The lower cover 10 is made of an insulating synthetic resin and is molded by a known injection molding. The lower cover 10 includes a plurality of outer walls 13 that are continuous with each other, and is formed in a bottomed cylindrical shape. The lower cover 10 is attached to the main body portion 8 so as to cover the lower side of the main body portion 8 in FIG. Further, the lower cover 10 is provided with an outer wall 13, that is, a leg portion 14 formed integrally with the lower cover 10 and extending from the outer wall 13 toward the panel 3 described above.

  The wiring board includes an insulating substrate and a conductive bus bar having a predetermined shape provided between the substrates. The wiring board connects the terminal fittings of the connector of the wire harness and the electrical components such as the relay and fuse described above. That is, the wiring board electrically connects the above-described electrical components such as relays and fuses and the wires of the wire harness according to a predetermined pattern.

  As shown in FIG. 1 and the like, the fixing structure 1 includes the panel 3, the nut 5, the fixed portion 15 formed integrally with the leg portion 14 at the tip of the leg portion 14, and a bolt as a fastening member. 17, a wedge member 20, and a connecting portion 24.

  As shown in FIGS. 1 to 3, the fixed portion 15 is made of a synthetic resin (that is, a resin) similar to the lower cover 10 and is formed integrally with the lower cover 10. The fixed portion 15 is formed in a thick flat plate shape, and a through hole 16 is provided (penetrated) in the center thereof. The planar shape of the through hole 16 is circular. The fixed portion 15 is overlaid on the other surface 3b on the near side in FIG. 1 of the panel 3 with the through hole 16 communicating with the hole 4 of the panel 3 described above.

  As shown in FIG. 1 or 4, the screw 17 passes through the wedge member 20, the through hole 16, and the hole 4, and is screwed into the screw hole 6 of the nut 5. In the bolt 17, the screw portion 19 is screwed into the screw hole 6 of the nut 5, so that the fixed portion 15 is sandwiched between the head 18 and the panel 3, and the fixed portion 15 is fixed to the panel 3.

  As shown in FIG. 4, the wedge member 20 is formed in a circular tubular shape whose outer diameter is equal to the inner diameter of the through hole 16 and whose inner diameter is larger than the outer diameter of the threaded portion 19 of the bolt 17. As shown in FIG. 2 or FIG. 3, the wedge member 20 is arranged coaxially with the through hole 16 and is connected to the fixed portion 15 via the connecting portion 24 so as to be integrated with the fixed portion 15. Is formed.

  Moreover, as shown in FIG. 3 etc., the 1st inclined surface 21, the 2nd inclined surface 22, and the fixed surface 23 are provided in the inner surface of the wedge member 20. As shown in FIG. The first inclined surface 21 is formed to be inclined so as to gradually increase the inner diameter of the wedge member 20 as it approaches the panel 3 from the center of the wedge member 20. The first inclined surface 21 is disposed near the connecting portion 24 in the axial direction of the wedge member 20 and is continuous with the connecting portion 24.

  The second inclined surface 22 is formed to be inclined so as to gradually increase the inner diameter of the wedge member 20 as it leaves the panel 3 from the central portion of the wedge member 20. The second inclined surface 22 is disposed closer to the end portion away from the connecting portion 24 in the axial direction of the wedge member 20. The constant surface 23 is formed so that the inner diameter is substantially equal to the outer diameter of the threaded portion 19 of the bolt 17. The constant surface 23 is disposed between the first inclined surface 21 and the second inclined surface 22, and is connected to both the first inclined surface 21 and the second inclined surface 22.

  The connecting part 24 is positioned on the surface of the fixed part 15 coaxially with the through hole 16 through the wedge member 20, and connects the fixed part 15 and the wedge member 20. That is, the connecting portion 24 positions the wedge member 20 on the surface of the fixed portion 15 adjacent to the through hole 16 and connects the fixed portion 15 and the wedge member 20. The connecting portion 24 is formed thinner than both the fixed portion 15 and the wedge member 20.

  As shown in FIG. 5, the wedge member 20 and the connecting portion 24 configured as described above are pressed by the head 18 of the bolt 17 when the screw portion 19 of the bolt 17 is screwed into the screw hole 6 of the nut 5. As a result, the connecting portion 24 is broken, and the wedge member 20 is inserted (press-fitted) into the through hole 16 of the fixed portion 15 together with the bolt 17. Then, as shown in FIG. 7, the wedge member 20 has the bolt 17 by the first and second inclined surfaces 21 and 22 when the through hole 16 of the fixed portion 15 and the hole 4 of the panel 3 are displaced. The bolt 17 can be guided to the nut 5 by inclining the shaft core P with respect to the central axis C of the wedge member 20.

  The fixing structure 1 having the above-described configuration fixes (attaches) the electrical junction box 2 to the panel 3 as follows. First, the fixed portion 15 provided at the tip of the leg portion 14 of the lower cover 10 constituting the box 7 of the electrical connection box 2 is connected to the panel 3 in a state where the through hole 16 communicates with the hole 4 of the panel 3. Overlay on the other surface 3b. Then, the wedge member 20 arranged coaxially with the through hole 16 of the fixed portion 15 communicates with the hole 4 of the panel 3.

  Next, as shown in FIG. 4, the screw portion 19 of the bolt 17 is passed through the wedge member 20, the through hole 16 of the fixed portion 15, and the hole 4 of the panel 3, and then the screw hole 6 of the nut 5. Screw in. At this time, as shown in FIG. 7, the first and second inclined surfaces 21 provided on the inner surface of the wedge member 20 even if the through hole 16 of the fixed portion 15 and the hole 4 of the panel 3 are slightly displaced. , 22 can lead the bolt 17 to the nut 5.

  When the screw portion 19 of the bolt 17 is screwed into the screw hole 6 of the nut 5, the wedge member 20 is pressed by the head 18 of the bolt 17 as shown in FIG. 5, and the wedge member 20 and the fixed portion 15 are pressed. And the wedge member 20 together with the bolt 17 is inserted (press-fitted) into the through hole 16 of the fixed portion 15.

  Thus, in the fixing structure 1 having the above-described configuration, as shown in FIG. 6, the screw portion 19 of the bolt 17 is inserted into the wedge member 20 inserted into the through hole 16 of the fixed portion 15 and into the hole 4 of the panel 3. Then, the fixed portion 15 is fixed to the panel 3 by being screwed into the screw hole 6 of the nut 5, and the electric connection box 2 is fixed (attached) to the panel 3.

  According to the present embodiment, since the wedge member 20 inserted between the through hole 16 of the fixed portion 15 and the bolt 17 passed through the through hole 16 is provided, the bolt 17 is screwed on the nut 5. When the screw 17 is screwed into the hole 6, the wedge member 20 supports the bolt 17, and the surroundings of the through-hole 16 of the fixed portion 15 can be prevented from being crushed (buckled). For this reason, the fixed part 15 can be reliably fixed to the panel 3 without rattling.

  Further, since the wedge member 20 and the fixed portion 15 are connected by the connecting portion 24, the wedge member 20 can be molded integrally with the fixed portion 15. For this reason, it is possible to prevent the man-hour and the number of parts required for molding the wedge member 20 from increasing.

  Further, since the connecting portion 24 is formed thinner than both the wedge member 20 and the fixed portion 15, when the bolt 17 is screwed into the screw hole 6 of the nut 5, the connecting portion 24 breaks and the bolt 17 At the same time, the wedge member 20 is press-fitted into the through hole 16. For this reason, only by screwing the bolt 17 into the screw hole 6 of the nut 5, the fixed portion 15 can be fixed to the panel 3, and an increase in the number of steps for fixing the fixed portion 15 to the panel 3 can be prevented.

  Further, since the wedge member 20 is formed in a circular tube shape that is inserted into the through hole 16 of the fixed portion 15 and through which the bolt 17 is passed, when the bolt 17 is screwed into the screw hole 6 of the nut 5, A gap is not easily formed between the inner surface of the through hole 16 of the fixing portion 15 and the bolt 17, and the bolt 17 can be reliably supported by the wedge member 20, and the periphery of the through hole 16 of the fixed portion 15 is crushed (buckled). ) Can be reliably prevented. For this reason, the to-be-fixed part 15 can be fixed to the panel 3 still more reliably.

  Further, since the first inclined surface 21 and the second inclined surface 22 are provided on the inner surface of the wedge member 20, even if the fixed portion 15 and the panel 3 are slightly displaced, these first and second inclined surfaces are provided. The bolts 17 can be guided to the nut 5 by the surfaces 21 and 22. For this reason, the bolt 17 can be reliably screwed into the screw hole 6 of the nut 5, and thus the fixed portion 15 can be reliably fixed to the panel 3.

  Further, since the constant surface 23 having a constant inner diameter is provided between the first inclined surface 21 and the second inclined surface 22 on the inner surface of the wedge member 20, when the bolt 17 is fastened, the bolt 17 and the wedge member It is difficult for a gap to form between the inner surface of 20. For this reason, the fixed part 15 can be reliably fixed to the panel 3 without rattling.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Fixing structure 2 Electrical junction box 3 Panel 3a One surface 3b The other surface 4 Hole 5 Nut 6 Screw hole 15 Fixed part 16 Through-hole 17 Bolt (fastening member)
20 Wedge member 21 1st inclined surface 22 2nd inclined surface 23 Constant surface 24 Connection part

Claims (4)

A panel made of metal and provided with holes,
A nut fixed on one surface of the panel in a state where the hole and the screw hole communicate with each other;
A fixed portion which is made of resin and has a through hole and is stacked on the other surface of the panel in a state where the through hole communicates with the hole;
In the fixing structure comprising the through hole and the fastening member screwed into the screw hole of the nut through the hole,
A wedge member inserted between the through hole and the fastening member passed through the through hole;
The wedge member is positioned on the surface of the fixed portion adjacent to the through hole to connect the fixed portion and the wedge member, and is thinner than both the fixed portion and the wedge member. A fixing structure comprising: a formed connecting portion.   The fixing structure according to claim 1, wherein the wedge member is formed in a circular shape that is inserted into the through hole and through which the fastening member passes.   The inner surface of the wedge member has a first inclined surface that gradually increases the inner diameter of the wedge member as it approaches the panel from the central portion of the wedge member, and is separated from the panel from the central portion of the wedge member. The fixing structure according to claim 2, further comprising: a second inclined surface that gradually expands the inner diameter of the wedge member according to claim 3.   The inner surface of the wedge member is provided with a constant surface that is continuous with both the first inclined surface and the second inclined surface and has an inner diameter that is constant and equal to that of the fastening member. Item 4. The fixing structure according to Item 3.

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