JP4296884B2 - EA material mounting structure - Google Patents

Description

  The present invention relates to an attachment structure for an EA material (impact energy absorbing material), and more particularly to an attachment structure for an EA material suitable for application to an 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. 5 is a cross-sectional view showing the EA material mounting structure described in FIG. 7 of the publication, FIG. 6A is a perspective view of the cylindrical body 20 used in this structure, and FIG. 2 is a cross-sectional perspective view of the cylindrical body 20. FIG.

  The cylindrical body 20 is integrally provided with a cylindrical 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 cylindrical body 20 to the rod 26. Then, the claw portion 23 is engaged with the concave portion 27. 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 cylindrical 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.

  As another example of the EA material mounting structure, the structure shown in FIG. 7 is considered.

  An EA material 41 made of a synthetic resin such as rigid urethane foam is attached to the door trim 42 via a locking portion 43 and a locked portion 44.

  The locking portion 43 is composed of a pair of protrusions 48, 48 erected from the trim 42. The protrusion 48 is provided with a claw portion 48a.

  The locked portion 44 includes a cylindrical portion 46, an anchor 45 that protrudes outwardly from the rear end of the cylindrical portion 46, and a flange 47 that protrudes outwardly from the distal end of the cylindrical portion 46. The locked portion 44 is provided with a cylindrical opening 52 penetrating the flange 47, the cylindrical portion 46, and the anchor 45 in the axial center line direction. A step 53 is recessed in the direction.

  The EA material 41 with the locked portion 44 is attached to the trim 42 by applying the projections 48 and 48 to the trim 42 while inserting the projections 48 into the opening 52. When the EA material 41 is pressed against the trim 42, the protrusions 48 are pushed into the opening 52. When the claw portion 48 a is pressed against the inner peripheral surface of the opening 52, the protrusions 48 and 48 are inserted into the opening 52 while being bent in the approaching direction. When the claw portion 48a reaches the step portion 53, the protrusions 48 and 48 try to elastically return to the original shape, and the claw portion 48a and the trim 42 sandwich the edge portion of the step portion 53. Further, the outer peripheral surfaces of the substantially semi-cylindrical portions 48 b and 48 b of the protrusions 48 and 48 come into contact with the inner peripheral surface of the opening 52 of the locked portion 44.

According to the structure of FIG. 7, the EA material 41 can be attached to the trim 42 by only one work process in which the EA material 41 with the locked portion 44 is overlapped on the trim 42, and attachment work efficiency is remarkably improved.
JP 2001-322507 A

  In the EA material mounting structure disclosed in Japanese Patent Application Laid-Open No. 2001-322507, the cylindrical body 20 and the EA material 33 are separated from each other. Therefore, when the EA material is attached to the trim 31, the EA material is trimmed. Two work steps, that is, a work applied to 31 and a work for fitting the cylindrical body 20 to the rod 26 thereafter, are required, and the work is troublesome.

  In the EA material mounting structure shown in FIG. 7, the claw portion 48 a may be detached from the step portion 53 when an impact force that twists the door trim is applied. In order to prevent this, it is conceivable to increase the rigidity by increasing the thickness of the protrusion 48. However, if this is done, sink marks are generated on the decorative surface of the trim (the surface opposite to the EA material), and the appearance quality is impaired.

  An object of the present invention is to provide an attachment structure for an EA material in which the workability of attaching the EA material to a member such as a trim is remarkably improved.

  Another object of the present invention is to provide an attachment structure for an EA material that can sufficiently increase the coupling force between the EA material and a member such as a trim without causing sink marks in the trim or the like.

  The attachment structure of the EA material of the present invention is a structure in which the EA material is attached to the member, and includes a locked portion standing on the member and a locking portion provided integrally with the EA material. In the EA material mounting structure in which the EA material is attached to the member, the locked portion is flat and the locking portions are arranged on both sides of the flat locked portion. It is characterized by being.

  In this EA material mounting structure, since the locked portion is integrated with the EA material, the locked portion is engaged with 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 work process of engaging with the stop.

  In the present invention, since the locked portion is flat and the locking portions are arranged on both sides of the flat locked portion, the locking portion is elastically deformed to engage with the locked portion. In this case, there is no restriction on the amount of deformation, and the coupling force between the locked portion and the locking portion can be sufficiently increased.

  In the present invention, the locking portion is elastically deformable, and after being elastically deformed when being engaged with the locked portion, the locking portion is elastically restored to be engaged with the locked portion. Thus, the locking portion can be easily engaged with the locked portion.

  In the present invention, the locked portion is provided in a member such as a trim, and the locking portion is provided in the EA material. If the thickness of the locking portion is increased, sufficient bonding strength can be obtained without increasing the thickness of the locked portion. For this reason, the occurrence of sink marks in the trim or the like is prevented.

  In the present invention, it is preferable that a recessed portion or an opening is provided in the locked portion, and the engaging portion is engaged with the recessed portion or the opening. Thus, the locked part which has a step part can be easily provided in a desired position. In this case, it is preferable that the locking part has a claw part engaged with the edge part of the step part. In particular, it is preferable that the locking portion is a protrusion, and a claw portion is provided on a side surface of the protrusion in the protruding direction.

  In the present invention, the locked portion may be provided with a plurality of the recesses or openings at intervals in the rising direction. In this case, the attachment strength of the EA material is sufficiently high by providing a plurality of the claw portions on the locking portion so as to engage with the plurality of recesses or openings of the locked portion, respectively. It becomes.

  In the present invention, a part of the EA material may contact a member such as a trim. If it does in this way, the attachment to the trim etc. of EA material will become stable.

  According to the present invention, the EA material can be easily attached to a member such as a trim, and the coupling force between the two can be sufficiently increased. Further, the appearance quality of a member such as a trim can be improved. According to the present invention, it is possible to improve the impact absorption characteristics of the EA material, and to attach the EA material firmly to the member even if the EA material has various shapes, sizes, and hardnesses.

  Hereinafter, embodiments will be described with reference to the drawings. 1A is a cross-sectional view of the EA material mounting structure according to the embodiment in a substantially horizontal direction, FIG. 1B is an exploded perspective view of the EA material mounting structure, and FIGS. ) Is a sectional view taken along line CC and DD in FIG. In addition, in FIG.1 (d), the trim 2 and the latching | locking part 3 are abbreviate | omitting illustration.

  An 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 a locking portion 3 and a locked portion 4. A locking portion 3 is provided on the EA material 1, and a locked portion 4 is provided on the trim 2. The locked portion 4 is made of a plate-like body standing upright from the trim 2, and a slit-like opening 4 a is provided at a lower portion (base side) thereof. The opening 4 a extends in a direction parallel to the trim 2.

  A pair of locking portions 3 are provided so as to be arranged on both sides of the plate-like locked portion 4. The locking portion 3 is a flat projection protruding from the base portion 3b, and has a claw portion 3a on the side surface on the distal end side. The claw portion 3 a has a triangular cross-sectional shape that decreases in height toward the distal end side of the locking portion 3. The pair of locking portions 3 and 3 are integrated in series via a base portion 3b that also functions as an anchor. The locking portions 3 and 3 and the base portion 3b are integrally formed of elastic synthetic resin. In addition, the claw part 3a is disposed on the opposite surface side of the locking parts 3 and 3.

  In this form, although the latching | locking parts 3 and 3 are the non-facing arrangement | positioning arrange | positioned in the state which shifted | deviated in those plate | board surface directions, you may be a facing arrangement. However, when the non-face-to-face arrangement is adopted, it becomes easy to mold the integrated body of the locking portions 3 and 3 and the base portion 3b.

  The integral part of the locking portions 3, 3 and the base portion 3 b is integrated with the EA material 1 by embedding the base portion 3 b in the EA material 1. The base portion 3b is integrated with the EA material 1 by being inserted into a molding die when the EA material 1 is foam-molded.

  There is a space S behind the locking portions 3 and 3 integrated with the EA material 1, and the EA material 1 has a space S when the locking portions 3 and 3 are elastically deformed to the back side of each. It is supposed not to hit.

  The EA material 1 with the locking portion 3 is attached to the trim 2 by applying the locking portions 3 and 3 to the trim 2 so as to sandwich the locked portion 4. When the EA material 1 is pressed against the trim 2, the locking portion 3 moves while being elastically deformed so as to slide toward the space S side. Eventually, the claw portion 3a enters the opening 4a, and the locking portion 3 and the locked portion 4 that have been restored to the original shape are engaged, and the EA material 1 is connected to the trim 2.

  In this way, the EA material 1 can be attached to the trim 2 by only one work step of superimposing the EA material 1 with the locking portion 3 on the trim 2, and the attachment work efficiency is remarkably improved. Moreover, since the latching | locking parts 3 and 3 hold | grip the to-be-latched part 4 from both sides, and the nail | claw part 3a has penetrated into the opening 4a, the EA material 1 is in any of the surface direction of the trim 2, and the contact / separation direction. It is immobile. Furthermore, since the space S is opened, there is no restriction on the sliding displacement of the locking piece 3, the protruding height of the claw portion 3a can be made sufficiently large, and the hook between the claw portion 3a and the opening 4a can be deepened. . Thereby, the attachment of the EA material 1 becomes very firm.

  By increasing the thickness of the locking portion 3, the attachment strength of the EA material 1 is sufficiently increased, and even if an impact that twists the EA material is applied, it is prevented from coming off. In addition, since the mounting strength can be secured without increasing the thickness of the locked portion 4, it is possible to prevent sink marks on the decorative surface of the trim 2.

  As shown in FIG. 1A, in this embodiment, the locking portion 3 does not penetrate the EA material 1, and the EA material 1 has a sufficient thickness in the vicinity of the locking portion 3. Even in the vicinity of the stop 3, the impact absorption characteristics of the EA material 1 are good.

  In the mounting structure of the EA material 1, the arrangement and number of the locking portions 3 and the locked portions 4 are arbitrary, and even EA materials of various shapes can be firmly and easily attached to the trim. Can be attached. Even if the EA material has a low hardness, the EA material can be firmly fastened by increasing the number of the locking portions 3 and the locked portions 4.

  The above embodiment is an example of the present invention, and the present invention may take forms other than those shown in the drawings. For example, the locking portion and the locked portion may have a shape other than the shape shown in FIG.

  In FIG. 2, the claw portion 3 a is provided not only on the distal end side but also in the middle of the standing direction in the locking portion 3, and is provided in two steps in total. Correspondingly, openings 4a are also provided in the latched portion 4 in two stages. Although not shown, the claw portion 3a and the opening 4a may be provided in three or more stages.

  In FIG. 3, one locking portion 3 is disposed on one plate surface side of the locked portion 4, and two locking portions 3 are disposed on the other plate surface side. Although not shown, a plurality of locking portions 3 may be disposed on both plate surface sides of the locked portion 4.

  Also in the case of FIG. 3, the locking part 3 may be provided with a plurality of stages of the claw part 3 a and the opening 4 a of the locked part 4.

  In FIG. 4, the locked portion 4 ′ has a recess 4 b instead of an opening. The claw portion 3a engages with the recess 4b. Also in this case, the EA material 1 (not shown in FIG. 4) is brought close to the trim 2 so that the locked portion 4 'is sandwiched between the locking portions 3 and 3 from both sides, and both are connected. In FIG. 4, the claw portion 3 a and the concave portion 4 b are provided in two stages, but may be one stage or three or more stages. The number of the locking portions 3 arranged on both sides of the locked portion 4 ′ is arbitrary.

  In the above embodiment, only the front end surfaces of the locked portions 4 and 4 ′ are in contact with the trim 2, and the EA material 1 is not in contact with the trim 2 as a whole. It may be configured such that a part of is in direct contact with the trim 2. If it does in this way, attachment of EA material will become stable.

1A is a cross-sectional view showing an EA material mounting structure according to the embodiment, FIG. 1B is an exploded perspective view of the EA material mounting structure, and FIGS. 1C and 1D are FIG. It is CC line and DD line sectional drawing of (b). FIG. 2A is a partial perspective view showing another embodiment, and FIG. 2B is a cross-sectional view taken along the line BB of FIG. 2A. Fig.3 (a) is a perspective view which shows another embodiment, FIG.3 (b) is a BB arrow line view of Fig.3 (a). FIG. 4A is a sectional view showing a different embodiment, and FIG. 4B is a perspective view showing a locked portion of FIG. 4A. It is sectional drawing which shows a prior art example. It is explanatory drawing of the structure of FIG. It is explanatory drawing of a reference example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 EA material 2 Trim 3 Locking part 3a Claw part 3b Base part 4, 4 'Locked part 4a Opening 4b Recessed part

Claims (11)

A structure in which an EA material is attached to a member, and a locked portion that is erected on the member engages with a locking portion that is provided integrally with the EA material. In the attachment structure of the EA material attached to the member,
The locked portion has a flat plate shape,
The EA material mounting structure is characterized in that the locking portions are arranged on both sides of the flat plate-like locked portion.   2. The locking portion according to claim 1, wherein the locking portion is elastically deformable, and after being elastically deformed when being engaged with the locked portion, the locking portion is engaged with the locked portion by being elastically restored. EA material mounting structure characterized by that.   3. The EA material mounting structure according to claim 2, wherein a recessed portion or an opening is provided in the locked portion, and the locking portion is engaged with the recessed portion or the opening.   4. The attachment structure for an EA material according to claim 3, wherein the engaging portion has a claw portion engaged with the concave portion or the opening.   5. The EA material mounting structure according to claim 4, wherein the engaging portion is a protrusion, 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 the locked portion is provided with a plurality of the recesses or openings at intervals in the standing direction.   7. The EA material according to claim 6, wherein a plurality of the claw portions are provided in the locking portion so as to engage with the plurality of recesses or openings of the locked portion, respectively. Mounting structure.   8. The EA material mounting structure according to claim 1, wherein a part of the EA material is in contact with the member.   9. The EA material mounting structure according to claim 1, wherein the member is an automobile trim.   The mounting structure for an EA material according to any one of claims 1 to 9, wherein the EA material is made of a synthetic resin such as hard urethane. 11. The base part according to claim 1, wherein a base part is embedded in the EA material, the locking part protrudes from the base part, and the locking part passes through the base part. It is provided integrally with the material,
The EA material is characterized in that a space exists on the back side opposite to the side facing the locked part of the locking part, and the locking part does not hit the EA material. Mounting structure.

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