JP2012240475A - Fixing structure of member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing structure of a member which can reliably suppress stress concentration on one member even when a load is imparted in an axial direction of a protruding part.SOLUTION: A fixing structure M of a member includes a first member 1 which has a projection 12 projected from a first base 11 and a second member 2 which has a through hole 21a pierced by the projection 12 and a second base 21 coming into surface contact with the first base 11. In the structure, the bases 11, 21 of the first member 1 and second member 2 are fixed to each other by caulking the tip 12a of the projection 12. A stiffening rib 22 arranged around the tip 12a of the projection 12 is provided to the surface of the second bases 21 on a side opposite to the first base 11.

Description

  The present invention relates to a member fixing structure for fixing two members.

  2. Description of the Related Art Conventionally, a member fixing structure including a first member having a boss protruding from a base and a second member having a base to which the tip of the boss is fixed is known (see Patent Document 1). Specifically, in this structure, ribs for functioning as a spacer portion for reinforcing the boss or maintaining a distance between two members are radially formed around the boss so as to connect the base portion and the boss.

JP 2009-166782 A

  However, in the related art, when a load along the axial direction of the boss is applied near the boss of the first member from the first member side toward the second member side, the root of the rib (the corner between the rib and the base) ) And the stress may concentrate on the first member, it has been desired to disperse the stress reliably.

  Therefore, the present invention provides a member fixing structure capable of reliably suppressing stress concentration on one member even when a load is applied in the axial direction of the boss (projection). Objective.

  The present invention for solving the above-described problems includes a first member having a protruding portion protruding from the first base portion, and a second base portion having a through-hole through which the protruding portion penetrates and in surface contact with the first base portion. A fixing structure of a member for fixing the base portions of the first member and the second member by caulking the tip of the projecting portion, and the first base portion of the second base portion and The opposite surface is provided with a reinforcing rib disposed around the tip of the protruding portion.

  According to the present invention, since the reinforcing rib is provided on the second member which is a member different from the first member on which the protruding portion is provided, the rib and the boss (projecting portion) are provided on the first member as in the related art. Compared with the form in which is integrally provided, even when a load is applied in the axial direction near the protruding portion of the first member, it is possible to suppress the concentration of stress on the first member.

  The reinforcing rib may be formed in a cylindrical shape surrounding the tip of the protruding portion.

  According to this, even when a load is applied in the protruding direction of the protruding portion with respect to the vicinity of the protruding portion of the first member, the load is received by the surface of the second member reinforced by the cylindrical reinforcing rib. Therefore, it is possible to further suppress the concentration of stress on the first member by dispersing the load on the second member.

  The first base and the second base may be bonded with an adhesive.

  According to this, even when an impact is applied to the first base portion away from the second base portion, the first base portion is prevented from being lifted with respect to the second base portion, and stress is concentrated on the base of the protruding portion. Can be suppressed.

  Moreover, the said protrusion part may be formed in the elongate shape extended along the surface direction of the said 1st base.

  According to this, since the fixed area by the protrusion is increased, the first member and the second member can be prevented from being separated by impact, and the impact force applied to the first member can be more reliably applied to the surface of the second member. Can be received at.

  An inner rib connected to the inner surface of the reinforcing rib and the second base portion may be provided on the inner surface of the reinforcing rib on the protruding portion side.

  According to this, since the intensity | strength of a 2nd base part can be raised more, a load can be more reliably disperse | distributed to a 2nd member and it can suppress that a stress concentrates on a 1st member.

  The first base portion may be formed of a foamed resin material having a plurality of bubbles inside.

  According to this, while being able to achieve weight reduction of components, damage to the foamed resin material that is easily damaged can be suppressed.

  According to the structure of Claim 1, even if it is a case where a load is added to the axial direction of a protrusion part, it can suppress reliably that stress concentrates on one member.

  According to the structure of Claim 2, it can suppress more that stress concentrates on the 1st member.

  According to the structure of Claim 3, it can suppress that the 1st base raises with respect to a 2nd base, and can suppress that stress concentrates on the base of a protrusion part.

  According to the structure of Claim 4, the impact force added to the 1st member can be more reliably received on the surface of the 2nd member.

  According to the structure of Claim 5, a load can be more reliably disperse | distributed to a 2nd member, and it can suppress that a stress concentrates on a 1st member.

  According to the structure of Claim 6, while being able to achieve weight reduction of components, the failure | damage of the foaming resin material which is easy to be damaged can be suppressed.

It is a disassembled perspective view which shows the fixing structure of the member which concerns on one Embodiment of this invention. It is the top view (a) which looked at the structure of FIG. 1 from the lower side, and sectional drawing (b) cut | disconnected by the II line | wire of FIG. 2 (a). It is the top view (a) which shows the form which adhere | attached the 1st base and the 2nd base with the adhesive agent, and sectional drawing (b) cut along the II-II line of Fig.3 (a). It is the top view (a) which shows the form which formed the protrusion part in the elongate shape, and sectional drawing (b) cut | disconnected by the III-III line of Fig.4 (a). It is the top view (a) which shows the form which provided the inner side rib, and sectional drawing (b) cut | disconnected by the IV-IV line of Fig.5 (a). It is the top view (a) which shows the modification of a reinforcement rib, and sectional drawing (b) cut | disconnected by the VV line of Fig.6 (a).

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the member fixing structure M includes a plate-like first member 1 and a plate-like second member 2. In addition, as the 1st member 1 and the 2nd member 2, what kind of members may be employ | adopted, for example, members, such as a door lining and an armrest attached to the said door line, are employable.

  The first member 1 includes a plate-like first base 11 and a cylindrical protrusion 12 that protrudes from the first base 11 toward the second member 2.

  The first base portion 11 is formed of a foamed resin material 11a having a plurality of bubbles therein and a pair of skin layers 11b that sandwich the foamed resin material 11a. In addition, as the foamed resin material 11a, any material may be employed, for example, foamed polypropylene or the like may be employed.

  The protrusion 12 is integrally formed with one (second member 2 side) skin layer 11b.

  The second member 2 is a plate-like member formed of resin, and has a plate-like second base portion 21 and reinforcing ribs 22.

  The second base 21 is formed with a through hole 21a for fixing the tip 12a of the protrusion 12. Specifically, as shown in FIG. 2 (b), the tip 12 a of the protrusion 12 penetrates the through hole 21 a of the second base 21 and is then melted by a heated jig, whereby the second base 21. It is caulked and fixed. In other words, the first base portion 11 and the second base portion 21 are fixed by crimping the tip end 12a of the projecting portion 12 by melting in a surface contact state.

  The reinforcing rib 22 is provided on the surface of the second base portion 21 opposite to the first base portion 11, and as shown in FIG. 2A, the reinforcing rib 22 has a rectangular cylindrical shape surrounding the tip end 12 a of the protruding portion 12. And is arranged around the tip 12a of the protrusion 12.

  That is, in the present embodiment, the reinforcing rib 22 is not provided on the first member 1 having the protruding portion 12 as in the prior art, but is provided on the second member 2 without the protruding portion 12. As a result, as indicated by an arrow in FIG. 2B, an axial direction (protrusion of the projecting portion 12) from the outside of the first member 1 (on the side opposite to the second member 2) to the vicinity of the projecting portion 12 of the first member 1 Even if a collision load is applied to the first member 1, the reinforcing rib 22 is not fixed to the first member 1, so that the corner between the reinforcing rib 22 and the first base 11 of the first member 1 is not fixed. The stress can be distributed to the second member 2 without stress concentration.

  That is, if the boss, rib, and base are integrally formed on the first member as in the prior art, the shape changes when the boss and rib move toward the second member due to a collision load and the base bends in a concave shape. Stress is concentrated and applied to the corner (connecting portion) between the rib and the base, which is a large portion. On the other hand, in the present embodiment, since the first member 1 has no ribs, the shape change does not become large, and the stress is difficult to concentrate on the first member 1. In addition, since the reinforcing rib 22 of the second member 2 is not integral with the boss, stress concentration on the second member 2 is also suppressed.

  As described above, even when a load is applied in the axial direction of the protruding portion 12, it is possible to reliably suppress stress concentration on one member.

  Further, since the reinforcing rib 22 is formed in a cylindrical shape, even when a load is applied to the vicinity of the protruding portion 12 of the first member 1, the load is reinforced by the cylindrical reinforcing rib 22. Since it is received by the surface of the second member 2, it is possible to further suppress the concentration of stress on the first member 1 by dispersing the load on the second member 2. In addition, since the reinforcing rib 22 is formed in a cylindrical shape, the rigidity of the second base portion 21 can be increased as compared with a mode in which the second base portion 21 is provided with a non-cylindrical rib.

  Furthermore, since the 1st base 11 is formed with the foamed resin material 11a, the weight reduction of the 1st member 1 can be achieved. In addition, when the first base portion 11 is formed of the foamed resin material 11a as described above, the stress is concentrated on the first base portion 11 and the first base portion 11 is damaged. However, according to the structure according to the present embodiment, , It can suppress the damage.

  Although the embodiments of the present invention have been described above, the present invention can be implemented with appropriate modifications as shown in other embodiments below. In the following description, components that are substantially the same as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the said embodiment, although the 1st base 11 and the 2nd base 21 were fixed only by caulking by welding of the protrusion part 12, this invention is not limited to this, For example, as shown to Fig.3 (a), (b) In addition, the first base 11 and the second base 21 may be bonded with the adhesive 3. According to this, even when an impact is applied to the illustrated left side portion of the first base portion 11 (location away from the second base portion 21), the lifting of the first base portion 11 with respect to the second base portion 21 is suppressed, It is possible to suppress the stress from being concentrated on the base of the protruding portion 12.

  In the said embodiment, although the protrusion part 12 was formed in the cylindrical shape, this invention is not limited to this, For example, as shown to Fig.4 (a), (b), the protrusion part 13 of the 1st base part 11 is used. You may form in the elongate shape (rib shape) extended along a surface direction. Specifically, two elongated protrusions 13 that are parallel to each other are formed in the first base 11, and two long holes 21 b corresponding to the protrusions 13 are formed in the second base 21. After passing each protrusion 13 through each long hole 21b, the tip of each protrusion 13 may be fixed by caulking by welding. According to this, since the fixed area becomes large, it is possible to suppress the first member 1 and the second member 2 from being separated by impact, and the impact force applied to the first member 1 can be more reliably applied to the second member 2. It can be received on the surface.

  Further, as shown in FIGS. 5A and 5B, an inner rib 23 connected to the inner surface 22 a of the reinforcing rib 22 and the second base portion 21 is provided on the inner surface 22 a on the protruding portion 12 side of the reinforcing rib 22. Also good. According to this, since the strength of the second base portion 21 can be further increased, it is possible to more reliably disperse the load on the second member 2 and to suppress the concentration of stress on the first member 1. . Moreover, since the inner surface surrounded by the cylindrical reinforcing rib 22 in the second base portion 21 is difficult to be deformed by the reinforcing rib 22, it is possible to suppress stress concentration at the base of the inner rib 23. .

  In the above embodiment, the rectangular cylindrical reinforcing rib 22 is adopted, but the present invention is not limited to this, and may be a cylindrical shape or other polygonal shapes. Further, for example, as shown in FIGS. 6A and 6B, a plurality of elongated reinforcing ribs 24 may be provided so as to surround the periphery of the tip 12a of the protruding portion 12 instead of being cylindrical. .

  In the said embodiment, although the protrusion part 12 was caulked by welding, this invention is not limited to this, You may deform | transform caulking mechanically.

  In the said embodiment, although the 1st base 11 was formed with the foamed resin material 11a, this invention is not limited to this, You may form with resin materials like non-foamed polypropylene.

DESCRIPTION OF SYMBOLS 1 1st member 2 2nd member 11 1st base 11a Foamed resin material 12 Protrusion part 12a Tip 21 2nd base 21a Through-hole 22 Reinforcement rib M Fixing structure

Claims (6)

A first member having a protrusion protruding from the first base, and a second member having a through hole through which the protrusion penetrates and having a second base in surface contact with the first base, A fixing structure of a member for fixing bases of the first member and the second member by caulking a tip;
A fixing structure for a member, wherein a reinforcing rib disposed around a tip of the projecting portion is provided on a surface of the second base opposite to the first base.   2. The member fixing structure according to claim 1, wherein the reinforcing rib is formed in a cylindrical shape surrounding the tip of the protruding portion.   The member fixing structure according to claim 1 or 2, wherein the first base and the second base are bonded with an adhesive.   4. The member fixing structure according to claim 1, wherein the protruding portion is formed in an elongated shape extending along a surface direction of the first base portion. 5.   5. The inner rib connected to the inner surface of the reinforcing rib and the second base portion is provided on the inner surface of the reinforcing rib on the projecting portion side. The fixing structure of the member as described in 2. The member fixing structure according to claim 1, wherein the first base portion is formed of a foamed resin material having a plurality of bubbles therein.

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