JP2004132462A - Mounting structure for ea material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure for an EA material in which the EA material can be easily mounted to a member such as a trim, and also, shock absorbing characteristics can be improved, and even if the EA material has various shapes, sizes, and hardness, the EA material can be firmly mounted to a member. <P>SOLUTION: The EA material 1 made of a synthetic resin such as a hard urethane foam is mounted to the trim 2 as a member via a locking part 3. The locking part 3 has a tube part 6, an anchor 5 projected in an outward flange shape from the rear end of the tube part 6, a flange 7 projected in an outward flange shape from the tip of the tube part 6, and a plurality of projections 8 protruded from the tip face of the tube part 6 in the direction parallel to the tube axial direction of the tube part 6. The EA material 1 is mounted to the trim 2 by applying to the trim 2 while inserting the projections 8 to an opening 4. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mounting structure of an EA material (impact energy absorbing material), and more particularly to a mounting structure of an EA material suitable for application to an automobile trim.
[0002]
[Prior art]
An EA material made of rigid urethane foam is attached to a door trim of an automobile to absorb impact energy (EA) in a side collision (side collision). As a method of attaching a hard urethane foam EA material to the door trim, JP-A-2001-322507 describes a structure shown in FIGS. FIG. 3 is a cross-sectional view showing the mounting structure of the EA material described in FIG. 7 of the same publication, FIG. 4 (a) is a perspective view of a tubular body 20 used in this structure, and FIG. FIG. 3 is a sectional perspective view of the tubular body 20.
[0003]
The tubular body 20 has a tubular portion 21 and an overhanging portion 22 integrally. A claw portion 23 is provided inward from the tip of the cylindrical portion 21. A recess 27 is provided on the outer peripheral surface of the rod 26 projecting from the trim 31, and the claw 23 is engaged with the recess 27.
[0004]
In addition, a slit 24 is provided in the cylindrical portion 21 in a direction parallel to the axis of the cylindrical portion 21 from the front end, and the cylindrical portion 21 is elastically deformable in the diameter-enlarging direction.
[0005]
To attach the EA material 33 to the trim 31, the EA material 33 is arranged along the surface of the trim 31 so that the rod 26 is inserted into the mounting hole 34 of the EA material 33, and then the tubular body 20 is fitted to the rod 26. Then, the claw portion 23 is engaged with the concave portion 27. As a result, the overhang portion 22 presses down the peripheral portion of the mounting hole 34 of the EA material 33.
[0006]
The cylindrical portion 21 has a tapered shape so as to be easily inserted into the mounting hole 34. When the tubular body 20 is mounted on 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.
[0007]
[Problems to be solved by the invention]
In the above-described conventional EA material mounting structure, when attaching the EA material to the trim 31, the work of applying the EA material to the trim 31 and the work of subsequently fitting the tubular body 20 to the rod 26 are performed. Two work processes are required, and work is troublesome. SUMMARY OF THE INVENTION It is an object of the present invention to provide an EA material mounting structure in which the workability of mounting an EA material to a member such as a trim is significantly improved.
[0008]
[Means for Solving the Problems]
The mounting structure of the EA material of the present invention, in the structure in which the EA material is mounted on the member, by engaging the locking portion provided integrally with the EA material with the locked portion provided on the member, The EA material is attached to the member.
[0009]
In the mounting structure of the EA material, since the locking portion is integrated with the EA material, the locking portion is locked by the member while the EA material with the locking portion is applied to the member. The EA material can be attached to the member in one working step of engaging with the part.
[0010]
In the present invention, the locking portion is elastically deformable, and after being elastically deformed when being engaged with the locked portion, it is elastically restored to engage with the locked portion. By doing so, the locking portion can be easily attached to the locked portion.
[0011]
In the present invention, the locked portion is preferably an opening. In this manner, the locked portion including the opening can be easily provided at a desired position. In this case, it is preferable that the locking portion has a claw engaged with an edge of the opening. In particular, the locking portion has a projection protruding from the EA material, and it is preferable that a claw portion is provided on a side surface of the projection in the protruding direction. Preferably.
[0012]
With such an attachment structure of the EA material, the EA material can be attached to the member by applying the EA material to the member while inserting the projection into the opening. In addition, since a plurality of protrusions are provided along the edge of the opening, movement (rattle) in the direction along the member surface of the EA material is prevented.
[0013]
In the present invention, it is preferable that the locking portion has a flange, and the edge of the opening is sandwiched between the flange and the claw portion. By providing this flange, the movement (rattle) of the EA material in the member contact / separation direction is prevented.
[0014]
In the present invention, since the base of the projection is embedded in the EA material, the bonding strength between the projection and the EA material can be increased. Further, by providing the base of the locking portion so as not to penetrate the EA material, it is possible to enhance the shock absorption characteristics of the EA material near the locking portion.
[0015]
In the present invention, the EA material is preferably made of a synthetic resin, particularly a foamed synthetic resin such as urethane foam. The locking portion can be firmly integrated with the synthetic resin EA material by embedding the base portion thereof.
[0016]
In the case of manufacturing the EA material made of the synthetic resin, the molding can be efficiently performed by holding the locking portion by a magnetic force in a mold for molding the EA material. Further, when the locking portion has a flange, the flange is brought into close contact with the mold by the magnetic force, and the generation of burrs is prevented.
[0017]
The mounting structure of the EA material is suitable for mounting a head protection pad or a pillar pad arranged along the inner surface of the automobile cabin, but is not limited thereto.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings. FIG. 1A is a substantially horizontal cross-sectional view showing an EA material mounting structure according to the embodiment, FIG. 1B is a side view of a locking portion of the EA material mounting structure, and FIG. FIG. 2B is a cross-sectional view for explaining a method of manufacturing the EA material with a locking portion, and FIG. 2B is an enlarged view of a part of FIG.
[0019]
As shown in FIG. 1, a plate-like EA material 1 made of a synthetic resin such as rigid urethane foam is attached to a trim (a door trim in this embodiment) 2 as a member via an engaging portion 3. In this embodiment, an opening 4 is provided in the trim 2 as a locked portion, and the locking portion 3 is engaged with the opening 4. The opening 4 is preferably circular, but is not necessarily limited to this.
[0020]
The locking portion 3 includes a tubular portion 6, an anchor 5 projecting outward from the rear end of the tubular portion 6 in a flange shape, a flange 7 projecting outwardly from the distal end of the tubular portion 6, and a tubular portion. 6 has a plurality (two in this embodiment) of projections 8 projecting in a direction parallel to the cylinder axis of the cylinder 6. The projections 8 are provided so as to face each other in the diameter direction of the opening 4. The number of the protrusions 8 is practically about 2 to 4.
[0021]
A claw portion 8a is provided on a side surface of the projection 8 in the protruding direction so as to protrude to the side, and a space 9 exists between the claw portion 8a and the flange 7. The protruding height of the claw portion 8a is increased toward the side as it approaches the flange 7, and the outer side surfaces of the protrusions 8, 8 are tapered. As a result, the projections 8, 8 can be easily inserted into the openings 4.
[0022]
The locking portion 3 is integrally formed of a synthetic resin as a whole, and the projections 8 are elastically deformable in the approaching direction.
[0023]
The synthetic resin forming the locking portion 3 contains ferromagnetic particles such as ferrite particles dispersed therein, and the locking portion 3 is magnetized by performing a magnetizing process on the ferromagnetic particles. Has become. As a result, the locking portion 3 can be magnetically attracted to and held by the mold for molding the EA material 1.
[0024]
As shown in FIG. 1, the engagement portion 3 has the tubular portion 6 and the anchor 5 embedded in the EA material 1. In this embodiment, the lower surface of the flange 7 is flush with the surface of the EA material 1, but the upper surface of the flange 7 may be flush with the surface of the EA material 1. The lower half may be embedded in the EA material 1, and the upper half of the flange 7 may protrude from the surface of the EA material 1. However, when the flange 7 projects from the surface of the EA material 1 as shown in FIG. Is uniquely determined.
[0025]
Although only one locking portion 3 is shown in FIG. 1, two or more locking portions 3 may be provided according to the size and shape of the EA material 1. The position of the locking portion 3 is also selected according to the size and shape of the EA material 1.
[0026]
The EA material 1 with the locking portion 3 is attached to the trim 2 by inserting the protrusions 8 into the opening 4 and applying the protrusions 8 to the trim 2. When the EA material 1 is pressed against the trim 2, the projections 8 are pushed into the openings 4. When the claw portion 8a is pressed against the inner peripheral surface of the opening 4, the projections 8, 8 are inserted into the opening 4 while bending in the approaching direction. When the claw 8a passes through the opening 4, the projections 8, 8 elastically return to the original shape, and the side surfaces of each projection 8 are elastically pressed against the inner peripheral surface of the opening 4, and the claw 8a And the flange 7 sandwich the edge of the opening 4 that has entered the space 9. As described above, the EA material 1 can be attached to the trim 2 in only one operation step of stacking the EA material 1 with the locking portion 3 on the trim 2, and the attachment work efficiency is significantly improved. Further, since the plurality of protrusions 8 of the locking portion 3 are elastically pressed against the inner peripheral surface of the opening 4, and the claw portion 8 a of each protrusion 8 and the flange 7 sandwich the edge of the opening 4, The EA material 1 is immovable in both the surface direction and the contact / separation direction of the trim 2, and the attachment of the EA material 1 is extremely firm.
[0027]
As shown in FIG. 1A, the engagement portion 3 has the tubular portion 6 and the anchor 5 embedded in the EA material 1. As described above, since the locking portion 3 does not penetrate the EA material 1 and the EA material 1 has a sufficient thickness near the locking portion 3, the EA material is also formed near the locking portion 3. 1 is excellent in shock absorption characteristics.
[0028]
In the mounting structure of the EA material 1, the arrangement and number of the locking portions 3 and the openings 4 are arbitrary, and even if the EA material has various shapes, it can be firmly and easily mounted on the trim. it can. Even if the EA material is soft, the EA material can be securely fastened by increasing the number of the locking portions 3 and the openings 4.
[0029]
In order to manufacture the EA material 1 with the locking portion 3, a mold including a lower mold 10 and an upper mold 11 is used as shown in FIG. What is necessary is just to hold | maintain, and to supply and synthesize | combine a synthetic resin material in a cavity. In the case of urethane or the like, a stock solution of urethane or the like may be supplied into the lower mold 10 and foamed. Note that injection foam molding may be used.
[0030]
The upper die 11 that holds the locking portion 3 is provided with a concave portion 12 that receives the projections 8 of the locking portion 3. An annular body 13 made of a ferromagnetic material (for example, an alloy such as an iron-cobalt alloy, or a ceramic material such as ferrite) is provided at the entrance of the concave portion 12. By magnetizing one of the annular body 13 and the locking part 3, the locking part 3 can be magnetically attracted and held to the annular body 13. Note that the annular body 13 is normally magnetized. The annular body 13 may be constituted by an electromagnet.
[0031]
The above-described molding is performed by magnetically attracting and holding the upper surface of the flange 7 on the lower surface of the annular body 13. After the synthetic resin is cured to a predetermined degree in the mold, the molded product is removed from the mold, whereby the EA material 1 with the locking portion 3 is obtained.
[0032]
Since the flange 7 closely adheres to the annular body 13 by magnetic attraction, it is possible to prevent the synthetic resin from entering between the flange 7 and the annular body 13 to generate burrs.
[0033]
The above embodiment is an example of the present invention, and the present invention can take forms other than those illustrated. For example, the flange 7 and the anchor 5 may have shapes other than those illustrated.
[0034]
【The invention's effect】
As described above, according to the present invention, the EA material can be easily attached to a member such as a trim. ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the shock absorption characteristic by an EA material, and to attach it firmly to a member even if it is an EA material of various shapes, sizes, and hardness.
[Brief description of the drawings]
FIG. 1A is a cross-sectional view showing an EA material mounting structure according to an embodiment, and FIG. 1B is a side view of a locking portion of the EA material mounting structure.
FIG. 2A is a cross-sectional view illustrating a method of manufacturing an EA material with a locking portion, and FIG. 2B is an enlarged view of a part of FIG. 2A.
FIG. 3 is a sectional view showing a conventional example.
FIG. 4 is an explanatory diagram of the structure of FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 EA material 2 Trim 3 Locking part 4 Opening 5 Anchor 6 Tube part 7 Flange 8 Projection 8a Claw part 9 Space 10 Lower mold 11 Upper mold 12 Recess 13 Annular body

Claims (12)

In the structure in which the EA material is attached to the member, the engaging portion provided integrally with the EA material engages with the locked portion provided on the member, so that the EA material is attached to the member. A mounting structure for an EA material. 2. The locking part according to claim 1, wherein the locking part is elastically deformable, and after being elastically deformed when being engaged with the locked part, is elastically restored to engage with the locked part. A mounting structure for an EA material. 3. The EA material mounting structure according to claim 2, wherein the locked portion is an opening. 4. The EA material mounting structure according to claim 3, wherein the locking portion has a claw portion engaged with an edge of the opening. 5. The EA material mounting structure according to claim 4, wherein the locking portion has a protrusion protruding from the EA material, and the claw portion is provided on a side surface of the protrusion in a protruding direction. 6. The EA material mounting structure according to claim 5, wherein a plurality of the protrusions are provided along an edge of the opening. The EA material mounting structure according to claim 5 or 6, wherein the locking portion has a flange, and the edge of the opening is sandwiched between the flange and the claw portion. The EA material mounting structure according to any one of claims 5 to 7, wherein a base of the locking portion is embedded in the EA material. 9. The mounting structure for an EA material according to claim 8, wherein a base of the locking portion is buried in the EA material in a non-penetrating manner. 9. An EA material mounting structure according to claim 1, wherein said member is a vehicle trim. The EA material mounting structure according to any one of claims 1 to 9, wherein the EA material is made of a synthetic resin such as hard urethane. 12. The mounting structure for an EA material according to claim 11, wherein the locking portion can be magnetically attracted and held to an EA material molding die.

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