JP2012241761A - Vehicle body component fastening structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable caulking again a caulking nut in a state that a bolt is screwed thereto.SOLUTION: This vehicle body component fastening structure 10 includes: a caulking nut 20 caulked by a component 12 provided in a vehicle body; a headed bolt 30 which fastens a fastened member 26 to the component 12 by being screwed to the caulking nut 20; and a female screw part 34 formed in a head part 32 of the headed bolt 30 and opened toward the axial direction of the headed bolt 30.

Description

  The present invention relates to a fastening structure for body parts.

  2. Description of the Related Art Conventionally, a fastening structure for a vehicle body part including a caulking nut and a bolt for fastening one member formed of a different metal and the other member is known (see, for example, Patent Document 1). The caulking nut is attached to one of the members by clamping the periphery of the through hole between the caulking portion and the flange portion that are caulked around the through hole of the one member.

JP 2010-112425 A

  However, if one of the members is made of resin, the area around the through hole creeps over time, and the clamping pressure of the caulking nut may be reduced. When the clamping pressure of the caulking nut is reduced, when the bolt is removed from the caulking nut, the caulking nut rotates together with the bolt, and there is a problem that the bolt cannot be removed from the caulking nut.

  In this case, the caulking nut needs to be caulked again to restore the clamping pressure, but in order to caulk the caulking nut again, it is necessary to screw the caulking nut into the caulking nut. However, when a bolt is screwed into the caulking nut, the bolt is obstructive and the caulking nut cannot be re-caulked.

  SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to obtain a fastening structure for a vehicle body part in which a caulking nut with a bolt still screwed can be re-caulked.

  In order to achieve the above object, a vehicle body part fastening structure according to claim 1 of the present invention is a caulking nut that is caulked to a part provided in the car body, and is screwed into the caulking nut. A bolt with a head for fastening a member to be fastened to the component; and a female screw portion formed on a head of the bolt with the head and opening in an axial direction of the bolt with the head. Yes.

  According to the first aspect of the present invention, the head of the bolt with the head screwed to the caulking nut is formed with the female screw portion that opens in the axial direction of the bolt with the head. Therefore, the caulking nut can be caulked again by screwing and pulling the male thread portion of the caulking jig to the female thread portion. That is, the caulking nut with the head-attached bolt screwed can be re-caulked.

  A vehicle body part fastening structure according to claim 2 is the vehicle body part fastening structure according to claim 1, wherein the part is made of resin.

  According to the second aspect of the present invention, it is particularly effective when the part to which the caulking nut is caulked is made of resin.

  A vehicle body part fastening structure according to claim 3 is the vehicle body part fastening structure according to claim 1 or 2, wherein the fastened member is a wiper bracket.

  According to the invention described in claim 3, it is particularly effective when the fastened member is a wiper bracket.

  As described above, according to the present invention, it is possible to provide a vehicle body component fastening structure capable of re-caulking a caulking nut while a bolt is screwed together.

It is sectional drawing which shows the fastening structure of the vehicle body component which concerns on this embodiment. It is sectional drawing which shows the state re-caulked with the jig | tool for caulking. (A) It is a partially expanded sectional view which shows the state before re-caulking. (B) It is a partially expanded sectional view which shows the state after re-caulking.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. For convenience of explanation, in each figure, the arrow UP may be an upward direction, and there may be a case where “up” and “down” are added as a reference. The direction of each part is not limited.

  As shown in FIG. 1, a fastening structure 10 used for fastening body parts includes a caulking nut 20 that is caulked to a fastening portion 14 of a resin panel 12 that is a resin part provided on the car body, and a caulking nut 20 that is screwed onto the caulking nut 20. By being combined, the resin panel 12 has a head-attached bolt 30 that fastens the wiper bracket 26 as a member to be fastened.

  A through hole 14 </ b> A for caulking and attaching a caulking nut 20 is formed in the fastening portion 14 in the resin panel 12. The caulking nut 20 is formed with a flange portion 22 having a circular shape in plan view supported by the inner peripheral edge portion 14B around the through hole 14A of the fastening portion 14.

  Further, the caulking nut 20 is compressed and crushed (caulked) by a caulking jig 40 shown in FIG. 2 at a position below the flange portion 22 and above the female screw portion 25. Thus, a caulking portion 24 that clamps the inner peripheral edge portion 14B of the fastening portion 14 with the flange portion 22 is formed.

  That is, the male screw portion 42 provided at the lower end portion of the caulking jig 40 is screwed into the caulking nut 20, and the male screw portion 42 is pulled upward in this state, so that the caulking nut 20 A caulking portion 24 is formed. The caulking nut 20 is attached and fixed to the inner peripheral edge portion 14B by sandwiching the inner peripheral edge portion 14B between the caulking portion 24 and the flange portion 22.

  The bolt 30 with a head is attached to a bolt insertion hole 26A formed in the wiper bracket 26 from above the wiper bracket 26 in order to fix the metal wiper bracket 26 to the upper surface of the flange portion 22 of the caulking nut 20. It is inserted and screwed into the caulking nut 20.

  That is, by this, the wiper bracket 26 is sandwiched and fixed by the head 32 and the flange portion 22 of the bolt 30 with head. The head portion 32 of the bolt 30 with head portion is formed with a female screw portion 34 that opens in the axial direction. The diameter of the female screw portion 34 is set to a size that allows the male screw portion 42 provided at the lower end portion of the caulking jig 40 to be screwed together.

  In addition, as shown in FIGS. 1 and 2, the resin panel 12 is formed with a closed cross-sectional structure by joining the outer peripheral edge portion 12A to another resin panel 16 with an adhesive 18 as shown in FIGS. ing. Accordingly, the lower side of the caulking nut 20 is inaccessible to the lower side of the flange portion 22, and the caulking portion 24 cannot be caulked from the lower side.

  Next, the operation of the vehicle body component fastening structure 10 having the above configuration will be described. As described above, the caulking nut 20 clamps the inner peripheral edge portion 14B around the through hole 14A in the fastening portion 14 of the resin panel 12 between the caulking portion 24 and the flange portion 22 that are caulked by the caulking jig 40. Is attached and fixed to the inner peripheral edge portion 14B.

  Therefore, when creep with time does not occur in the inner peripheral edge portion 14B, when the headed bolt 30 is screwed into the caulking nut 20 or when the headed bolt 30 is removed from the caulking nut 20, The caulking nut 20 does not rotate with the headed bolt 30, and the headed bolt 30 is thereby screwed into the caulking nut 20 or removed from the caulking nut 20.

  However, when the inner peripheral edge portion 14B creeps with time, the clamping pressure on the inner peripheral edge portion 14B by the flange portion 22 and the caulking portion 24 is reduced (insufficient), and the head-attached bolt 30 is removed from the caulking nut 20. The caulking nut 20 rotates together with the head-equipped bolt 30, and a problem that the head-mounted bolt 30 cannot be removed from the caulking nut 20 occurs.

  Therefore, in this case, the caulking portion 24 is caulked again by the caulking jig 40. That is, as shown in FIG. 2, the male screw portion 42 provided at the lower end portion of the caulking jig 40 is screwed into the female screw portion 34 formed on the head portion 32 of the head-mounted bolt 30.

  As shown in FIG. 3A, the upper surface of the wiper bracket 26 is pressed from above by a pressing member 44 that is coaxially and cylindrically provided on the radially outer side of the male screw portion 42 of the caulking jig 40. In this state, the male screw portion 42 that is screwed into the female screw portion 34 is pulled upward (pulled).

  Then, as shown in FIG. 3 (B), the head-mounted bolt 30 is pulled upward, so that the female screw portion 25 of the caulking nut 20 into which the head-mounted bolt 30 is screwed is directed upward. Be raised. Here, the female thread portion 25 of the caulking nut 20 is formed below the caulking portion 24.

  Therefore, when the female screw portion 25 of the caulking nut 20 is pulled upward, buckling deformation of the caulking portion 24 proceeds, and the caulking portion 24 is caulked again. That is, as a result, the clamping pressure on the inner peripheral edge portion 14B of the caulking portion 24 and the flange portion 22 is restored, and the caulking nut 20 is fixed to the inner peripheral edge portion 14B again. The headed bolt 30 can be removed from the caulking nut 20.

  Thus, the inner peripheral edge portion 14B of the fastening portion 14 sandwiched between the flange portion 22 and the caulking portion 24 of the caulking nut 20 creeps over time, and the clamping pressure on the inner peripheral edge portion 14B by the flange portion 22 and the caulking portion 24 is increased. Can be removed from the caulking nut 20 without destroying the bolt 30 with head, even if a phenomenon occurs in which the bolt 30 with head cannot be removed from the caulking nut 20.

  Further, since the caulking jig 40 pulls up (pulls) the head-attached bolt 30 while the wiper bracket 26 is pressed from above, there is no possibility that the wiper bracket 26 is deformed. As the caulking jig 40, a known pop hand nutter MN10A can be adopted as an example, but is not particularly limited thereto.

  As mentioned above, although the fastening structure 10 of the vehicle body part which concerns on this embodiment was demonstrated based on drawing, the fastening structure 10 which concerns on this embodiment is not limited to the thing of illustration, and deviates from the summary of this invention. The design can be appropriately changed within the range not to be. For example, the part to which the caulking nut 20 is caulked does not have to be made of resin.

  However, the fastening structure 10 according to the present embodiment is particularly effective when the part to which the caulking nut 20 is caulked is made of resin, that is, when there is a risk of creep occurring with time. The fastening structure 10 according to the present embodiment is particularly effective when the member to be fastened is the wiper bracket 26, that is, when the clamping pressure of the caulking nut 20 may be reduced due to vibration generated by a wiper (not shown). Become.

10 Fastening structure 12 Resin panel (component)
20 Caulking nut 26 Wiper bracket (fastened member)
30 Bolt with head 32 Head 34 Female thread

Claims (3)

A caulking nut that is caulked to parts provided on the vehicle body,
A bolt with a head that fastens a member to be fastened to the component by being screwed to the caulking nut;
A female screw part formed on the head of the bolt with the head and opening in the axial direction of the bolt with the head;
A vehicle body component fastening structure characterized by comprising:   The fastening structure for a vehicle body part according to claim 1, wherein the part is made of resin.   The fastening structure for a vehicle body part according to claim 1 or 2, wherein the member to be fastened is a wiper bracket.

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