JP2005207524A - Clip for mounting ea material and its mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide structure of mounting an energy absorption (EA) material, which is superior to EA characteristic, and a clip for it. <P>SOLUTION: The clip 2A includes a tubular part 3A and flanges 4, 4 provided at both ends of the tubular part 3A. The clip 2A is so configured that the tubular part 3A is smaller in wall thickness than the tubular part 3 of the clip 2. The clip 2 is provided at a lug 1a of the EA material 1. The EA material 1 is superimposed on the trim 5 so that a columnar protuberance 6 protruded from a trim 5 is inserted into the clip 2. Subsequently, a deposition jig is pressed at tip of the protuberance 6 and a flange-like hold-down part 6a is formed by diametrically enlarging the tip of the protuberance 6 in substantially disk-shaped fashion. Thereby, the EA material 1 is fixed to the trim 5. The EA characteristic of the EA material is adapted to be successful when pressure is applied on the EA material 1 as indicated in arrow head F because the tubular part 3A in thin wall thickness easily crushes together with the lug 1a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an EA material (impact energy absorbing material) mounting clip and mounting structure, and more particularly to an EA material mounting clip and mounting structure suitable for application to automobile trim.

  An EA material made of hard urethane is attached to a door trim of an automobile for energy absorption (EA) at the time of a side collision (side collision). As a method of attaching a hard urethane EA material to the door trim, Japanese Patent Application Laid-Open No. 2001-322507 describes a structure shown in FIGS. FIG. 6 is a cross-sectional view showing the EA material mounting structure described in FIG. 7 of the publication, FIG. 7 (a) is a perspective view of the cap 20 used in this structure, and FIG. 7 (b). FIG. 3 is a cross-sectional perspective view of the cap 20.

  The cap 20 is integrally provided with a tube portion 21 and an overhang portion 22. A claw portion 23 is provided inward from the tip of the tube portion 21. A concave portion 27 is provided on the outer peripheral surface of the rod 26 protruding from the trim 31, and the claw portion 23 is engaged with the concave portion 27.

  Note that a slit 24 extends from the tip of the tube portion 21 in a direction parallel to the axial center line of the tube portion 21, and the tube portion 21 can be elastically deformed in the diameter increasing direction.

  To attach the EA material 33 to the trim 31, place the EA material 33 along the surface of the trim 31 so that the rod 26 is inserted into the attachment hole 34 of the EA material 33, and then fit the cap 20 to the rod 26. The claw portion 23 is engaged with the concave portion 27 by pushing. Thereby, the overhanging portion 22 presses the peripheral edge portion of the mounting hole 34 of the EA material 33.

  The cylindrical portion 21 has a tapered shape that is easy to insert into the mounting hole 34. When the cap 20 is attached to the rod 26, the outer peripheral surface of the cylindrical portion 21 is in close contact with the inner peripheral surface of the mounting hole 34.

  As another conventional example, an EA material mounting method shown in FIG. 5 is known.

  In this conventional example, a clip 2 is integrally provided on an EA material 1 made of hard urethane or the like. As shown in FIG. 5 (d), the clip 2 is provided with flanges 4 and 4 at both ends of the cylindrical portion 3. As shown in FIG. The clip 2 is integrated with hard urethane or the like by being attached to a mold during foam molding of the EA material 1.

The clip 2 is provided on the overhanging portion 1 a of the EA material 1. As shown in FIGS. 5 (a) and 5 (b), the EA material 1 is superposed on the trim 5 so that the columnar protrusion 6 protruding from the trim 5 is inserted into the clip 2. The protrusion 6 is made of a thermoplastic resin such as polyethylene or polypropylene. Next, a welding jig (not shown) is pressed against the tip of the protrusion 6, and the flange 6 is formed by expanding the tip of the protrusion 6 into a substantially disk shape as shown in FIG. 5 (c). Thereby, the EA material 1 is fixed to the trim 5.
JP 2001-322507 A

  In the EA material mounting structure shown in FIGS. 6 and 7, the cap 20 and the EA material 33 are separate from each other. Therefore, when the EA material is attached to the trim 31, the EA material is applied to the trim 31. And the work of fitting the cap 20 to the rod 26 after that is necessary, and the work is troublesome.

  In the EA material mounting structure of FIG. 5, when an external force is applied in the direction of arrow F and the EA material 1 is crushed and deformed, the clip 2 is not crushed and the EA characteristics in the vicinity of the overhanging portion 1a tend to be inferior. It becomes.

  An object of the present invention is to provide an attachment structure for an EA material having excellent EA characteristics and a clip for the improvement, while improving the workability of attaching the EA material to a member such as a trim.

  The EA material mounting clip of the present invention (Claim 1) is characterized in that the EA material mounting clip for mounting the EA material to the member can be crushed and deformed together with the EA material when the EA material is deformed. .

  The clip for attaching an EA material according to claim 2 is the clip for attaching EA material according to claim 1, wherein the clip for attaching the EA material has a cylindrical portion and flanges provided at both ends of the cylindrical portion. It is characterized in that it can be crushed and deformed when the material is deformed.

  The clip for attaching an EA material according to claim 3 is characterized in that, in claim 2, the thickness of the cylindrical portion is 5 to 30% of the thickness of the flange.

  A clip for attaching an EA material according to a fourth aspect is characterized in that, in any one of the first to third aspects, a fragile portion is provided in the cylindrical portion.

  The clip for attaching an EA material according to claim 5 is characterized in that, in claim 4, the fragile portion is an opening or a recess.

  A clip for attaching an EA material according to a sixth aspect of the present invention is the clip for attaching an EA material according to any one of the first to third aspects, wherein a stress concentrating portion is provided in which stress is concentrated when a pressing force is applied to the cylindrical portion in a cylindrical axis direction. It is characterized by.

  An EA material mounting clip according to a seventh aspect is characterized in that, in the sixth aspect, the stress concentration portion is a small diameter portion provided in the cylindrical portion.

  The attachment structure of the EA material of the present invention (Claim 8) is a structure in which the EA material is attached to a member, and the EA material attachment clip according to any one of claims 1 to 7 is integrally formed with the EA material. The EA material is attached to the member by engaging a locking portion provided on the member with the clip for attaching the EA material.

  In the EA material mounting clip and the EA material mounting structure of the present invention, when an external force is applied in the crushing direction to the vicinity of the EA material mounting portion, the clip is crushed together with the EA material, so that the EA characteristics are good. It will be something.

  When this clip has a cylinder part and the flange provided in the both ends of the cylinder part, it is preferable that a cylinder part is a thing which crush-deforms. In this case, the thickness of the cylindrical portion is preferably 5 to 30% of the thickness of the flange.

  In this case, the tube portion may be configured to be crushed and deformed by providing a weak portion in the tube portion. As this weak part, an opening or a groove | channel is suitable.

  By providing a stress concentration part where stress is concentrated when a pressing force is applied to the cylinder part in the cylinder axis direction, the cylinder part may be easily deformed.

  As this stress concentration part, the small diameter part provided in the cylinder part is suitable.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 (a) is a longitudinal sectional perspective view of an EA material mounting clip 2A according to an embodiment of the present invention, and shows a cross section of the same portion as FIG. 5 (d). FIG. 1 (b) is an enlarged cross-sectional view showing the EA material mounting structure using this clip, and shows the same portion as the cross section near the left overhanging portion 1a in FIG. 5 (c).

  The clip 2A has a cylindrical portion 3A and flanges 4 and 4 provided at both ends of the cylindrical portion 3A. The clip 2 </ b> A has the same configuration as the clip 2 except that the tube portion 3 </ b> A is thinner than the tube portion 3 of the clip 2. The clip 2A is made of a synthetic resin (for example, polypropylene or polyethylene), and the thickness of the cylindrical portion 2A is 5 to 30% of the thickness of the flange 4, specifically 0.1 to 0.6 mm. It is preferable that

  The clip 2A is integrated with the EA material 1.

  The attachment structure of the EA material 1 using the clip 2A is the same except that the clip 2A is used instead of the clip 2, and the reference numerals other than 2A and 3A in FIG. The same part as c) is shown.

  In the EA material mounting structure using the clip 2A, when a pressing force is applied to the EA material 1 as indicated by an arrow F in FIG. 1 (b), the thin cylindrical portion 3A is easily crushed. The EA characteristics of this are good.

  FIG. 2 (a) is a cross-sectional view showing an EA material mounting structure using a clip 2B according to another embodiment, and FIG. 2 (b) is a locking portion for locking the EA material 1 to a trim. FIG. 2C is a cross-sectional perspective view of the clip 2B.

  The clip 2B has a stepped portion 7 provided around the inner peripheral surface of the cylindrical portion 3B. The cylindrical portion 3B is the same thin as the cylindrical portion 3A. The step portion 7 is provided in the middle of the tube portion 3B in the tube axis direction. The clip 2B is integrated with the EA material 1.

  In this embodiment, a pair of protrusions 8, 8 project from the trim 5, and the EA material 1 is attached to the trim 5 by the protrusions 8, 8.

  A claw portion 8a is provided on the side surface of the protrusion 8 in the protruding direction so as to protrude laterally. As the claw portion 8a approaches the substantially semi-cylindrical portion 8b constituting the proximal end side of the protrusion 8, the protruding height toward the side increases. Thereby, the protrusions 8 and 8 are substantially pointed and can be easily inserted into the cylindrical portion 3B.

  The protrusion 8 is formed of a synthetic resin having elasticity, and the protrusions 8 and 8 can be elastically deformed in the approaching direction. Although the number of protrusions 8 is two in the figure, it may be three or more. Practically 2 to 3 are preferable.

  The EA material 1 with the clip 2B is attached to the trim 5 by applying the projections 8 and 8 to the trim 5 while inserting them into the cylindrical portion 3B. That is, when the EA material 1 is pressed against the trim 5, the protrusions 8 and 8 are pushed into the cylindrical portion 3B. When the claw portion 8a is pressed against the inner peripheral surface of the tube portion 3B, the protrusions 8 and 8 are inserted into the tube portion 3B while being bent in the approaching direction. When the claw portion 8 a reaches the step portion 7, the protrusions 8 and 8 try to return to the original shape elastically, and the claw portion 8 a and the trim 5 sandwich the edge of the step portion 7.

  In this way, the EA material 1 can be attached to the trim 5 by only one work step of superimposing the EA material 1 with the clip 2B on the trim 2, and the attachment work efficiency is remarkably improved.

  FIG. 3 is a cross-sectional perspective view of a clip 2C according to still another embodiment. The clip 2C corresponds to the clip 2B in which a stress concentration portion is provided in the cylindrical portion 3B. That is, this clip 2C is provided with flanges 4 and 4 at both ends of a thin cylindrical portion 3C. The cylindrical portion 3C has a small diameter portion 9 in the middle in the vertical direction. A stepped portion 7 is provided on the inner peripheral surface. The cylindrical portion 3 </ b> C has a shape in which the diameter gradually decreases from the flanges 4, 4 toward the small diameter portion 9.

  The EA material mounting structure using the clip 2C is the same as that shown in FIG. Also in this EA material mounting structure, since the cylindrical portion 3C is crushed when the EA material is deformed, the EA characteristics are good.

  The clip 2D in FIG. 4 is obtained by providing a thin cylindrical portion 3D with a slit 10 as a fragile portion. The slit 10 extends in the cylinder axis direction of the cylinder portion 3D. The EA material mounting structure using the clip 2D is the same as that shown in FIG. Also in this EA material mounting structure, since the cylinder portion 3D is crushed when the EA material is deformed, the EA characteristics are good.

  In the present invention, the clip may be arranged on the main body portion of the EA material as shown in FIGS. 8 and 9 instead of the overhanging portion 1a, and the effects of FIGS. 8 and 9 are greater.

  Each of the above embodiments is an example of the present invention, and the present invention can take forms other than those shown in the drawings. For example, the clip is not limited to the illustrated female type, and may be a male type. Although slits are provided in FIG. 4, other shapes of openings may be provided. Moreover, you may provide recessed parts, such as a groove | channel, instead of openings, such as a slit.

FIG. 1 (a) is a longitudinal sectional perspective view of an EA material mounting clip 2A according to an embodiment of the present invention, and FIG. 1 (b) is an enlarged sectional view showing an EA material mounting structure using this clip. It is. FIG. 2 (a) is a sectional view showing an EA material mounting structure using a clip 2B according to another embodiment, FIG. 2 (b) is a perspective view of a protrusion as a locking portion of the EA material 1, and FIG. FIG. 2C is a cross-sectional perspective view of the clip 2B. It is a cross-sectional perspective view which shows the clip which concerns on another embodiment. It is a cross-sectional perspective view which shows the clip concerning another embodiment. It is sectional drawing which shows a prior art example. It is sectional drawing which shows another prior art example. It is explanatory drawing of the cap used for the prior art example of FIG. It is sectional drawing which shows different embodiment. It is sectional drawing which shows different embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 EA material 1a Overhang | projection part 2,2A, 2B, 2C, 2D Clip 3,3A, 3B, 3C, 3D Cylinder part 4 Flange 5 Trim 6 Protrusion 6a Flange-shaped presser part 7 Step part 8 EA material latching protrusion 9 Small diameter part 10 Slit

Claims (8)

In the EA material attachment clip for attaching the EA material to the member,
A clip for attaching an EA material, wherein the EA material can be crushed and deformed together with the EA material when the EA material is deformed. In claim 1, the EA material mounting clip has a cylindrical portion and flanges provided at both ends of the cylindrical portion,
A clip for attaching an EA material, wherein the cylindrical portion is capable of being crushed and deformed when the EA material is deformed.   The clip for attaching an EA material according to claim 2, wherein the thickness of the cylindrical portion is 5 to 30% of the thickness of the flange.   The clip for attaching an EA material according to any one of claims 1 to 3, wherein a fragile portion is provided in the cylindrical portion.   5. The clip for attaching an EA material according to claim 4, wherein the fragile portion is an opening or a concave portion.   The clip for attaching an EA material according to any one of claims 1 to 3, wherein a stress concentration portion is provided in which stress is concentrated when a pressing force is applied to the cylinder portion in a cylinder axis direction.   The clip for attaching an EA material according to claim 6, wherein the stress concentration portion is a small diameter portion provided in the cylindrical portion.   In a structure in which an EA material is attached to a member, the EA material attachment clip according to any one of claims 1 to 7 is integrally provided on the EA material, and a locking portion provided on the member is provided. An EA material mounting structure, wherein the EA material is attached to the member by engaging with the EA material mounting clip.

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