JP2011214650A - Fixing structure of member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing structure of a member capable of reliably suppressing the concentration of stress to a single member even when a load is applied in the axial direction of a boss.SOLUTION: This fixing structure M of a member includes a first member 1 having the boss 12 projecting from a base 11 and a second member 2 having a base 21 to which the distal end 12a of the boss 12 is fixed. Spacer parts (ribs 22) which are disposed around the boss 12 and which hold the distance between the base 11 of the first member 1 and the base 21 of the second member 2 are provided to the second member 2 so as to project from the base 21 of the second member 2 and to be brought into contact with the base 11 of the first member 1.

Description

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

  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, an object of the present invention is to provide 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.

  In order to solve the above-described problem, the invention according to claim 1 of the present invention is a member including a first member having a boss projecting from a base portion and a second member having a base portion to which a tip of the boss is fixed. The spacer portion is disposed around the boss and maintains a distance between the base portion of the first member and the base portion of the second member, and protrudes from the base portion of the second member. It is provided in the second member so as to be in contact with the base of the member.

  According to the first aspect of the invention, even when a load is applied in the axial direction near the boss of the first member, the load is transmitted to the second member via the spacer portion of the second member. Compared with the form in which the spacer portion is provided integrally with the boss only on the first member, it is possible to disperse the load on the second member and suppress the concentration of stress on the first member.

  The invention according to claim 2 is characterized in that the spacer portion of the second member is a plurality of ribs extending radially from the boss in a radial direction so as to support the boss from the periphery.

  According to the invention which concerns on Claim 2, since the boss | hub is reinforced with radial ribs (the fall of a boss | hub is suppressed), the rigidity of a boss | hub can be improved.

  According to a third aspect of the present invention, the first member further includes a spacer portion that protrudes from a base portion of the first member and contacts the base portion of the second member, and the spacer portion of the second member and the first member Each spacer part is formed so that the contact area with the base part of one member is larger than the contact area between the spacer part of the first member and the base part of the second member.

  According to the invention of claim 3, since the spacer portion of the second member contacts the base in a wider range than the spacer portion of the first member, the load is distributed to the second member, and stress is applied to the first member. Concentration can be suppressed.

  The invention according to claim 4 is characterized in that the spacer portion of the second member is a rib formed in a cylindrical shape separated from the boss with the boss as a center.

  According to the invention of claim 4, since the cylindrical rib does not contact the boss, it is not necessary to strictly manage the positional accuracy of the rib with the boss, and the assembly of each member can be facilitated.

  According to a fifth aspect of the present invention, an elastic shock-absorbing material that is softer than the spacer portion and absorbs an impact force contacts the base portion of the first member at the base portion of the second member. It is provided.

  According to the invention which concerns on Claim 5, since a load can be absorbed with an impact buffering material, it can suppress more that stress concentrates on the 1st member.

  According to a sixth aspect of the present invention, the spacer portion of the second member is bent from the base portion toward the first member, and the first member extends from the tip of the first extension portion. It is characterized by comprising a second extending portion that is bent and extended along the base portion of the first member and is in surface contact with the base portion of the first member.

  According to the invention which concerns on Claim 6, since it can receive a load in the wide surface of the 2nd extension part bent, a bigger load can be disperse | distributed to a 2nd member. Further, the load can be absorbed by the elastic deformation of the bent first extending portion.

  According to the first aspect of the present invention, compared to a configuration in which the spacer portion is provided integrally with the boss only on the first member, the load is distributed to the second member, and stress concentration on the first member is suppressed. Can do.

  According to the invention which concerns on Claim 2, the rigidity of a boss | hub can be improved.

  According to the invention which concerns on Claim 3, a load can be disperse | distributed to a 2nd member and it can suppress that a stress concentrates on a 1st member.

  According to the invention which concerns on Claim 4, it is not necessary to manage strictly the positional accuracy with the boss | hub of a rib, and the assembly | attachment of each member can be made easy.

  According to the invention which concerns on Claim 5, it can suppress more that stress concentrates on the 1st member.

  According to the invention which concerns on Claim 6, while a bigger load can be disperse | distributed to the 2nd member, a load can also be absorbed in the bent 1st extension part.

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 made the rib cylindrical, and sectional drawing (b) cut | disconnected by the II-II line of Fig.3 (a). The top view (a) which shows the form which provided the shock-absorbing material, It is sectional drawing cut | disconnected by the III-III line of Fig.4 (a), Sectional drawing (b) which shows the state before attaching two members, It is sectional drawing (c) which shows the state after an assembly | attachment. It is the top view (a) which shows the form which forms a spacer part in the shape bent, and sectional drawing (b) cut | disconnected by the IV-IV line of Fig.5 (a). It is sectional drawing which shows the modification of the 2nd extension part of FIG. It is a figure which shows the form which provided the rib in both the 1st member and the 2nd member, and is the top view (a) which shows a 1st member, and the top view (b) which shows a 2nd member. It is the top view (a) which shows the state which assembled | attached the 1st member shown in FIG. 7, and the 2nd member, and sectional drawing (b) cut | disconnected by the VV line of Fig.8 (a). It is a figure which shows the form which added the new rib to the 2nd member shown in FIG.7 (b), the top view (a) which shows a 1st member, the top view (b) which shows a 2nd member, and 1st It is a top view (c) which shows the state which assembled | attached the member and the 2nd member.

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 base 11 and a boss 12 that protrudes from the base 11 toward the second member 2.

  The base 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 boss 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 an example of a spacer portion that maintains a distance between the plate-like base portion 21 and the base portion 11 of the first member 1 and the base portion 21 of the second member 2. And four (plural) ribs 22.

  A hole 21 a for fixing the tip 12 a of the boss 12 is formed in the base portion 21. Specifically, as shown in FIG. 2 (b), the tip 12 a of the boss 12 passes through the hole 21 a of the base portion 21 and is then fixed to the base portion 21 by being melted by a heated jig.

  The rib 22 protrudes from the base portion 21 and comes into contact with the base portion 11 of the first member 1 to maintain the distance between the first member 1 and the second member 2 and is formed integrally with the base portion 21. As shown in FIG. 2A and FIG. 1, the rib 22 is arranged close to the periphery of the boss 12 when the members 1 and 2 are fixed. It is formed to extend radially (cross shape). Thereby, the boss 12 of the first member 1 can be reinforced by the ribs 22 of the second member 2 to increase the rigidity of the boss 12.

  That is, in the present embodiment, the rib 22 that maintains the distance between the two members 1 and 2 and also serves as the reinforcement of the boss 12 is not provided in the first member 1 having the boss 12 as in the prior art. It is provided on the second member 2 that does not have 12. As a result, as shown by an arrow in FIG. 2B, when a collision load is applied in the axial direction near the boss 12 of the first member 1 from the first member 1 side to the second member 2 side, Even when the base 11 of the one member 1 is bent so as to be recessed downward (second member 2 side) around the boss 12, the rib 22 is not fixed to the first member 1. The stress is not concentrated at the corner between the base 22 and the base 11 of the first member 1, and the load can be distributed to the second member 2.

  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.

  Further, since the rib 22 provided on the second member 2 is not integrated with the boss 12, even if the second member 2 is bent near the hole 21 a, the rib 22 is restrained by the boss 12. You can freely change the direction without having to. Therefore, stress concentration at the base of the rib 22 is suppressed.

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

  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 above embodiment, the radial ribs 22 are used as the spacer portion. However, the present invention is not limited to this, and for example, as shown in FIGS. 3A and 3B, the cylindrical ribs 23 are used. Also good. Specifically, the rib 23 is formed so as to surround the boss 12 at a position away from the boss 12. In this structure, since the rib 23 is not brought close to the boss 12, it is not necessary to strictly manage the positional accuracy of the rib 23 with the boss 12, and the assembly of the members 1 and 2A can be facilitated.

  Further, as shown in FIGS. 4A to 4C, apart from the rib 23, a sponge 24, which is softer than the rib 23 and elastically deformable and absorbs an impact force, is used as a first example. You may provide in the base 21 of 2 member 2B. A member such as rubber or a spring may be adopted as the shock absorbing material.

  Specifically, the sponge 24 is formed in a cylindrical shape that is spaced apart radially outward of the cylindrical rib 23 and is higher than the rib 23 as shown in FIG. It is formed so as to protrude toward the first member 1 side. As a result, as shown in FIG. 4C, when the members 1 and 2B are fixed, the sponge 24 is surely in contact with the base 11 of the first member 1.

  According to this structure, since the impact load applied to the vicinity of the boss 12 of the first member 1 can be absorbed by the sponge 24, it is possible to further suppress stress concentration on the first member 1. The shape of the sponge 24 and the shape of the rib 23 are not limited to a cylindrical shape, and various shapes can be arbitrarily adopted.

  Further, as shown in FIGS. 5A and 5B, the spacer portion 25 of the second member 2C is bent from the plate-like base portion 26 toward the first member 1 and extends to the first member 251. You may comprise with the 2nd extension part 252 bent and extended from the front-end | tip of the 1st extension part 251. FIG.

  Specifically, the first extending portion 251 extends so as to increase in diameter toward the outer side in the radial direction of the boss 12 toward the first member 1 from the base portion 26 where the boss 12 is fixed. Therefore, the first extending portion 251 can be bent and deformed around the connection portion with the base portion 26 as compared with the first extending portion formed in a cylindrical shape (cylindrical shape parallel to the axial direction of the boss 12). Therefore, an impact load can be absorbed.

  Further, the second extending portion 252 is bent and extends in a direction away from the boss 12 (radially outward) along the base portion 11 of the first member 1, and is in surface contact with the base portion 11 of the first member 1. . Therefore, since the load can be received on the wide surface of the bent second extending portion 252, a larger load can be distributed to the second member 2C.

  In addition, you may form the 2nd extension part 252 so that the front-end | tip part 252A may be warped so that it may leave | separate from the base 11, as shown in FIG. According to this, since the front end portion 252A (edge portion) of the second extending portion 252 does not contact the base portion 11, it is possible to prevent the base portion 11 from being damaged by the front end portion 252A.

  In the above-described embodiment, the rib 22 (spacer portion) is provided only on the second member 2, but the present invention is not limited to this. For example, as shown in FIGS. 7 (a) and 7 (b), the second member 2 is provided. In addition, the first member 1D may be provided with ribs 17 (spacer portions) that maintain the distance between the first member 1D and the second member 2 after the ribs 22 are provided on the first member 1D.

  Specifically, as shown in FIGS. 8A and 8B, the rib 17 of the first member 1D protrudes from the base 11 of the first member 1D toward the second member 2 and protrudes from the base 21 of the second member 2. The distance between the first member 1D and the second member 2 is maintained. Four ribs 17 are arranged around the boss 12 and are formed integrally with the boss 12 and the base portion 11 so as to extend in a radial shape from the boss 12 in a cross shape (specifically, a direction different from the rib 22). Has been. Thereby, the boss 12 is strongly reinforced by the rib 17.

  And as shown to Fig.8 (a), the rib 22 of the 2nd member 2 is wider than the rib 17 of 1st member 1D, and is formed long in radial direction. That is, each contact area between the rib 22 of the second member 2 and the base portion 11 of the first member 1D is larger than the contact area between the rib 17 of the first member 1D and the base portion 21 of the second member 2. Ribs 17 and 22 are formed.

  According to this structure, since the rib 22 of the second member 2 is in contact with the counterpart component (base 11) in a wider range than the rib 17 of the first member 1D, a larger load can be distributed to the second member 2. it can.

  Further, as shown in FIGS. 9A to 9C, the four ribs 22 in the form of FIG. 8 may be integrally connected by a rectangular tubular rib 27. According to this, since the rigidity of each rib 22 becomes high, the space | interval of 1st member 1D and 2nd member 2E and the reinforcement | strengthening of the boss | hub 12 can be performed more reliably. Further, by forming the rectangular ribs 27 at the same height as the ribs 22, the contact area between the ribs 22 and 27 and the base portion 11 of the first member 1D becomes larger, so a larger load is applied to the second member 2E. Can be dispersed.

  Note that the structure of the spacer portion is not limited to the above-described embodiment. For example, the spacer portion may be configured by fixing a member separate from the base portion with an adhesive or the like so as to be integrated with the base portion. Further, the shape and number of the spacer portions are not limited to the above embodiment, and for example, one or a plurality of spacer portions having various shapes such as a cylinder or a polygonal column may be provided.

  In the above embodiment, the tip 12a of the boss 12 is melted and caulked to be fixed to the base 21 of the second member 2. However, the present invention is not limited to this. For example, the boss is screwed to the base of the second member. You may fix by fastening by.

  In the embodiment, the base 11 is formed of the foamed resin material 11a. However, the present invention is not limited to this, and the base 11 may be formed of a resin material such as non-foamed polypropylene. However, when the foamed resin material 11a is used as in the above-described embodiment, the weight can be reduced. However, the strength of the resin material when the load is applied is inferior to the resin material that does not foam. Strength improvement is particularly effective.

DESCRIPTION OF SYMBOLS 1 1st member 2 2nd member 11 Base 12 Boss 12a Tip 21 Base 22 Rib M Member fixing structure

Claims (6)

A first member having a boss protruding from the base;
A member fixing structure including a second member having a base to which a tip of the boss is fixed,
A spacer portion disposed around the boss and maintaining a distance between the base portion of the first member and the base portion of the second member protrudes from the base portion of the second member and contacts the base portion of the first member. The member fixing structure is provided on the second member.   The member fixing structure according to claim 1, wherein the spacer portion of the second member is a plurality of ribs that extend radially from the boss in a radial direction so as to support the boss from the periphery. . The first member further includes a spacer portion that protrudes from the base portion of the first member and contacts the base portion of the second member,
Each spacer portion is formed such that the contact area between the spacer portion of the second member and the base portion of the first member is larger than the contact area between the spacer portion of the first member and the base portion of the second member. The member fixing structure according to claim 1, wherein the member fixing structure is provided.   The member fixing structure according to claim 1, wherein the spacer portion of the second member is a cylindrical rib formed so as to surround the boss at a position away from the boss. .   The base portion of the second member is provided with an elastically deformable shock absorbing material that is softer than the spacer portion and absorbs an impact force so as to contact the base portion of the first member. The member fixing structure according to any one of claims 1 to 4. The spacer part of the second member is
A first extending portion extending from the base portion to bend toward the first member;
The first extending portion includes a second extending portion that bends and extends along the base portion of the first member and is in surface contact with the base portion of the first member. The fixing structure of the member of Claim 1 or Claim 3.

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