JP2013002473A - Fastening structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fastening structure capable of preventing generation of a creep in a part made of a resin when a part to be attached is fastened and fixed even if a metal color is not used.SOLUTION: A reinforcement 16 with a seat 22 to which a nut 26 is welded is embedded in a resin plate 12 such that the seat 22 is exposed on the metal plate 14 side. A through hole 24 formed in the seat 22 and a through hole 28 formed in the metal plate 14 are coaxially disposed, a bolt 30 is passed through the through holes 24 and 28 from the side opposite to the resin plate 12 of the metal plate 14, and the nut 26 is screwed. Thus, since fixing the metal plate 14 to the resin plate 12 does not cause a load interposed between the bolt 30 and the nut 26 to act on the resin plate 12, the generation of creep in the resin plate 12 can be prevented even if the metal-made color or the like is not used.

Description

  The present invention relates to a fastening structure for fastening and fixing a resin part formed of a synthetic resin material and a fastened part formed of metal or the like.

  For example, as disclosed in Patent Document 1 below, when a resin component (flange 30 in Patent Document 1) formed of a synthetic resin material and a metal component (engine body EG in Patent Document 1) are fastened and fixed. Is a bolt in which a metal cylindrical body called a collar or the like (a metal ring in Patent Document 1) is fitted into a hole through which a bolt penetrates on the resin component side, and further penetrates the cylindrical body through the metal component. By screwing the nut to the metal part, the metal part and the resin part are fastened and fixed without applying excessive stress at the time of fastening and fixing to the resin part.

Japanese Laid-Open Patent Publication No. 2006-275270

  However, by providing a metal cylindrical body called a collar or the like, the number of parts is increased and the cost is increased, so that creep does not occur in resin parts without using such a cylindrical body. There is a demand for a structure that can fasten and fix resin parts and metal parts.

  In view of the above facts, an object of the present invention is to obtain a fastening structure capable of preventing the occurrence of creep in a resin part when the attached part is fastened and fixed without using a metal collar.

  The fastening structure according to the present invention as set forth in claim 1 penetrates the attached part from the side opposite to the resin part of the attached part fastened to the resin part formed of a synthetic resin material. A fastening member protruding to the resin part side and at least a part of the fastening member is embedded in the resin part, and a seat is exposed to the attached part side, and the attached part is fastened to the resin part. In the state, the fastening member penetrates the seat part, and at least a part of the resin part is embedded in a state in contact with the seat part on the opposite side of the seat part to be attached, And a fastened member that sandwiches and fixes the seat portion and the attached part with the fastening member by engaging the fastening member.

  In the fastening structure according to the first aspect of the present invention, at least a part of the plate member is embedded in the resin part. A seat portion is formed on the plate member, and the seat portion is exposed to the attached part side of the resin part.

  On the other hand, the fastening member penetrates the attached part from the opposite side of the attached part to the resin part, protrudes toward the resin part, and penetrates the seat. On the opposite side of the seat part to the attached part, at least a part of the fastening member is embedded in the resin part, and when the fastening member penetrating the seat part engages with the fastening member, the attached part and the seat The part is sandwiched directly or indirectly between the fastening member and the fastened member, and the fastened part is fastened and fixed to the resin part.

  As described above, in the fastening structure according to the present invention, the seating portion that becomes the seat of the fastened member is formed on the plate member embedded in the resin part, and the fastening force when the fastening member is screwed to the fastened member Since it acts as a force for sandwiching the seat portion and the mounted part, it is possible to prevent the occurrence of creep in a resin part formed of a synthetic resin material without using a separate metal collar.

  A fastening structure according to a second aspect of the present invention is the fastening structure according to the first aspect, wherein the member to be fastened is integrally provided on the seat portion.

  In the fastening structure according to the second aspect of the present invention, the member to be fastened is integrally provided in the seat portion. For this reason, a to-be-fastened member becomes a part of plate member substantially, for example, a to-be-fastened member can be easily embed | buried in resin-made parts with a plate member by insert molding.

  According to a third aspect of the present invention, there is provided a fastening structure according to the second aspect of the invention, wherein the nut welded to the seat portion is used as the member to be fastened, and a bolt that can be screwed into the nut is fastened. It is a member.

  In the fastening structure according to the third aspect of the present invention, the fastened member is a nut and the fastening member is a bolt. Therefore, when the bolt that penetrates the attached part from the side opposite to the resin part of the attached part passes through the seat and is screwed into the nut, the attached part is sandwiched between the bolt and the nut, The part to be fastened is fastened and fixed to the resin part.

  Here, the nut is welded to the seat and integrated. For this reason, the nut substantially becomes a part of the plate member. For example, the nut can be easily embedded in the resin part together with the plate member by insert molding.

  According to a fourth aspect of the present invention, there is provided the fastening structure according to any one of the first to third aspects, wherein the reinforcement for reinforcing the resin part is used as the plate member.

  In the fastening structure according to the fourth aspect of the present invention, the metal plate on which the seat portion is formed serves as reinforcement for reinforcing the resin part. For this reason, it is not necessary to separately provide a plate member only for providing the seat portion, an increase in the number of parts can be suppressed, and the cost can be reduced.

  As described above, in the fastening structure according to the first aspect of the present invention, creep can be prevented from occurring in the resin part when the attached part is fastened and fixed without using a metal collar.

  In the fastening structure according to the second aspect of the present invention, the member to be fastened can be embedded in the resin part as a part of the plate member.

  In the fastening structure according to the third aspect of the present invention, the nut can be embedded in the resin part as a part of the plate member.

  In the fastening structure according to the fourth aspect of the present invention, it is not necessary to separately provide a plate member only for providing the seat portion, an increase in the number of parts can be suppressed, and the cost can be reduced.

It is sectional drawing explaining the fastening structure which concerns on one embodiment of this invention. It is a perspective view of the plate member applied with the fastening structure concerning one embodiment of the present invention. It is a perspective view which shows the modification of a plate member.

<Configuration of the present embodiment>
FIG. 1 shows a cross-sectional view of a resin plate 12 and a metal plate 14 fastened using a fastening structure according to an embodiment of the present invention. The resin plate 12 is an embodiment of the resin part in the present invention, and is formed entirely in a plate shape from a synthetic resin material. The resin plate 12 is applied to, for example, an outer panel in a side door or a back door of a vehicle. On the other hand, the metal plate 14 is formed in a plate shape from a metal such as iron or stainless steel. It is applied as a bracket or a part thereof for attaching a hinge that is rotatably supported around an axis having an axial direction.

  As shown in this figure, a reinforcement 16 as a plate member is provided inside the resin plate 12. As shown in FIG. 2, the reinforcement 16 is made of a metal such as iron or stainless steel in a plate shape whose longitudinal dimension is sufficiently longer than the width dimension. Further, as shown in FIG. 1, the reinforcement 16 is embedded in the resin plate 12 so that the thickness direction of the reinforcement 16 is along the thickness direction of the resin plate 12, thereby reinforcing the resin plate 12 formed of a synthetic resin material. is doing.

  A recess 18 is formed in the reinforcement 16. The recess 18 includes a pair of leg wall portions 20. The leg wall portion 20 is bent from the main body side of the reinforcement 16 to the metal plate 14 side, and is inclined so that one leg wall portion 20 and the other leg wall portion 20 gradually approach toward the metal plate 14 side. is doing. The end portion on the metal plate 14 side of one leg wall portion 20 and the end portion on the metal plate 14 side of the other leg wall portion 20 are connected by a seat portion 22, and the recess 18 is entirely formed of the metal plate. It has a concave shape that projects toward the side 14 and opens toward the side opposite to the metal plate 14.

  As described above, the reinforcement 16 is embedded in the resin plate 12, but as shown in FIG. 1, the surface of the seat 22 on the metal plate 14 side is exposed on the surface of the resin plate 12 on the metal plate 14 side. ing. In FIG. 1, the surface of the seat portion 22 on the metal plate 14 side and the surface of the resin plate 12 on the metal plate 14 side are flush, but the surface of the seat portion 22 on the metal plate 14 side is the metal of the resin plate 12. You may have a level | step difference located in the metal plate 14 side rather than the surface at the plate 14 side.

  A circular through hole 24 is formed in the seat portion 22. Further, the seat portion 22 is provided with a nut 26 as a member to be fastened. The nut 26 is coaxially welded to the through hole 24 on the surface of the seat portion 22 opposite to the metal plate 14 (that is, the nut 26 is a so-called “weld nut”). The nut 26 is embedded in the resin plate 12 together with the reinforcement 16 in a state where the surface opposite to the seat portion 22 is exposed to the outside on the surface opposite to the metal plate 14 of the resin plate 12.

  On the other hand, a circular through hole 28 is formed in the metal plate 14. The through hole 28 is formed coaxially with the through hole 24. Bolts 30 as fastening members pass through the through holes 28 and 24. The bolt 30 has a head portion 32 whose outer peripheral shape is larger than that of the through hole 28. The bolt 30 is provided so that the head 32 is located on the opposite side of the metal plate 14 from the resin plate 12. A step 34 is formed on the end surface of the head 32 on the metal plate 14 side.

  The step portion 34 is formed in a columnar shape having an outer diameter dimension equal to or smaller than the inner diameter dimension of the through hole 28 and the through hole 24 and coaxial with the head portion 32. The axial dimension of the step portion 34 is set to be equal to or less than the sum of the thickness of the metal plate 14 and the thickness of the seat portion 22. A male screw 36 is formed coaxially with respect to the stepped portion 34 and the head portion 32 from an end surface of the stepped portion 34 opposite to the head portion 32, and is screwed into a female screw 38 of the nut 26.

<Operation and effect of the present embodiment>
In the present embodiment as described above, the male screw 36 is held until the end surface on the metal plate 14 side of the head portion 32 and the end surface on the seat portion 22 side of the nut 26 are clamped until the seat portion 22 and the metal plate 14 are in pressure contact. The metal plate 14 is fixed to the resin plate 12 (or the resin plate 12 is fixed to the metal plate 14) by being screwed into the nut 26.

  In this state where the metal plate 14 is fixed to the resin plate 12, the load sandwiched between the head 32 and the nut 26 only acts on the seat portion 22 and the metal plate 14, and is formed of a synthetic resin material. It does not act on the resin plate 12. For this reason, the resin plate 12 is not cracked or inadvertently deformed by the load sandwiched between the head portion 32 and the nut 26. In addition, when the metal plate 14 is fixed to the resin plate 12 in this way, it is not necessary to separately use a metal cylindrical body such as a collar, so the number of parts can be reduced and the cost can be reduced.

  Further, when molding the resin plate 12, the reinforcement 16 and the nut 26 can be embedded in the resin plate 12 by insert molding the reinforcement 16 in which the nut 26 is welded to the seat portion 22. In the state where the reinforcement 16 and the nut 26 are embedded in the resin plate 12, the reinforcement 16 and the nut 26 are substantially integrated with the resin plate 12. Therefore, the cost can be reduced also in this sense. Further, since the reinforcement 16 also serves as a member that reinforces the resin plate 12, it is not necessary to separately provide components that constitute the seat of the nut 26, and in this sense, the cost can be reduced.

  In addition, in this Embodiment, it was the structure which welded the nut 26 to the seat part 22, However, For example, when shape | molding the resin plate 12, only fixing the nut 26 to the reinforcement 16 to insert with an adhesive agent etc. It may be a configuration.

  Further, the reinforcement 16 and the nut 26 may be formed separately without fixing (welding) the nut 26 to the seat portion 22. In this case, only the reinforcement 16 is insert-molded together with the resin plate 12, and a hole is formed in the reinforcement 16 so that the nut 26 can be placed on the seat portion 22.

  Further, in the present embodiment, the reinforcement 16 is a plate member. However, from the viewpoints of claims 1 to 3, a plate member may be provided separately from the reinforcement reinforcement.

  Further, in the present embodiment, the metal reinforcement 16 is used as a plate member. From the viewpoint of reinforcement, the plate member is preferably made of metal. However, the material of the plate member is not limited to metal. In other words, the plate has a mechanical strength that can withstand a load that sandwiches the seat portion 22 and the metal plate 14 between the head portion 32 and the nut 26 when the metal plate 14 is fixed to the resin plate 12. The member is not limited to the material.

  Moreover, in this Embodiment, although the recessed part 18 of the reinforcement 16 comprised including the seat part 22 was a structure which has a pair of leg wall part 20, as shown in FIG. You may comprise the recessed part 18 in the cup shape in which the seat part 22 was formed so that the cyclic | annular surrounding wall 52 and the metal plate 14 side of this surrounding wall 52 may be closed from a main-body part.

  Furthermore, in this embodiment, the fastening member is the bolt 30 and the fastened member is the nut 26, but the metal plate 14 and the seat portion 22 can be sandwiched and held between the fastening member and the fastened member. The fastening member and the fastened member are not limited to the bolt 30 and the nut 26.

  In the present embodiment, the reinforcement 16 is configured such that the surface of the seat portion 22 on the metal plate 14 side is only exposed to the outside, and the other portion is embedded in the resin plate 12. Only the portion 20 may be embedded in the resin plate 12, and the main body portion of the resin plate 12 (that is, the side opposite to the seat portion 22 of the leg wall portion 20) may be exposed to the outside of the resin plate 12.

  Further, in the present embodiment, the nuts 26 as the fastened members are all embedded in the resin plate 12. However, it is only necessary that at least a part of the nut 26 (member to be fastened) is embedded in the resin plate 12, and therefore a part of the nut 26 (member to be fastened) may protrude from the resin plate 12.

  In the present embodiment, the seat portion 22 and the metal plate 14 are in direct contact with each other. For example, another member such as a washer or a spring washer is interposed between the seat portion 22 and the metal plate 14. It may be configured to.

  Furthermore, in describing the present embodiment, the application example of the resin plate 12 is described as an outer panel of a vehicle door or a back door at the beginning, and the application example of the metal plate 14 is described as a bracket to which a hinge is attached. The metal plate 14 is not limited to such a configuration, and can be widely applied to fastening of a part to be fastened made of a material other than a synthetic resin material and a resin part other than the vehicle or other parts of the vehicle.

12 Resin plate (resin parts)
14 Metal plate (attached parts)
16 Reinforce (plate member)
22 Seat 26 Nut (member to be fastened)
30 bolt (fastening member)

Claims (4)

A fastening member that penetrates the attached part from the side opposite to the resin part of the attached part that is fastened to the resin part formed of a synthetic resin material, and protrudes toward the resin part side,
At least a portion is embedded in the resin part, and the fastening member penetrates the seat part in a state where the seat part is exposed to the attached part side and the attached part is fastened to the resin part. A plate member to be
At least a part of the seat is embedded in the resin part while being in contact with the seat on the opposite side of the seat to the mounted part, and the fastening member is engaged so that the seat and the mounted A member to be fastened by sandwiching and fixing the part with the fastening member;
Fastening structure comprising   The fastening structure according to claim 1, wherein the fastened member is integrally provided on the seat portion.   The fastening structure according to claim 2, wherein a nut welded to the seat portion is used as the fastening member, and a bolt that can be screwed onto the nut is used as the fastening member.   The fastening structure according to any one of claims 1 to 3, wherein a reinforcement that reinforces the resin part is the plate member.

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