JP5691287B2 - Foam molded member, clip for mounting the foam, method for manufacturing foam molded member, and mounting structure for foam molded member - Google Patents

Description

  The present invention relates to a clip for attaching a foamed molded article to an attached member, and in particular, a cylindrical clip body having an insertion hole into which a clip locking projection provided on the attached member is inserted, and And an engaging portion provided on the inner peripheral surface of the insertion hole to which the clip locking projection engages, and at least one end side of the clip body in the direction of the cylinder axis is embedded in the foamed molded body. It is related with the clip integrated with this foaming molding by doing. The present invention also provides a foam molded member integrated with the foam molded body so that the clip is embedded in the foam molded body, a method for producing the foam molded member, and the foam molded member. It is related with the attachment structure attached to the to-be-attached member via.

  The back side of the vehicle door (inside the vehicle) may be abbreviated as an impact energy absorbing material (hereinafter referred to as EA material) made of rigid urethane foam for absorbing energy absorption (EA) at the time of side collision of the vehicle. .) Is attached. As a method of attaching this EA material to a door trim, JP 2005-47225 A (Patent Document 1) provides a clip on the EA material and engages this clip with a clip locking projection provided on the door trim. Thus, it is described that the EA material is attached to the door trim. In Patent Document 1, the clip is integrated with the EA material body so that a part of the clip is embedded in the EA material body.

  FIG. 5 is an explanatory diagram of the clip and EA material mounting structure described in FIG. FIG. 5 (a) is a cross-sectional view showing this EA material mounting structure, FIG. 5 (b) is a perspective view of a clip locking projection of this EA material mounting structure, and FIG. It is a longitudinal cross-sectional perspective view of the clip used for the EA material attachment structure.

  In this EA material attachment structure, the EA material 101 is attached to the door trim 102 via the clip 104 and the clip locking projection 108.

  The clip locking protrusion 108 has a pair of protruding portions 108 b and 108 b protruding from the door trim 102. Claw portions 108a projecting sideways are provided on the side surfaces on the front end side of the protruding portions 108b and 108b. The claw portion 108a has a laterally protruding height that increases toward the proximal end side of each protruding portion 108b.

  Each protrusion 108b is formed of an elastic synthetic resin, and these protrusions 108b and 108b can be elastically deformed in the approaching direction.

  The clip 104 has a cylindrical clip body 106 having an insertion hole 112 into which the clip locking protrusion 108 is inserted, and projects outwardly from one end side of the clip body 106 in the cylinder axis direction. An anchor portion 105 and a flange portion 107 projecting outwardly from the other end side of the clip body 106 in the cylinder axis direction are provided. The insertion hole 112 penetrates the clip body 106 from one end surface to the other end surface in the cylinder axis direction. A concave step 113 is provided in the circumferential direction on the inner peripheral surface of the insertion hole 112.

  As shown in FIG. 5 (a), the clip 104 has a clip body 106 and an anchor portion 105 embedded in the EA material 101.

  When the EA material 101 including the clip 104 is attached to the door trim 102, the EA material 101 is pressed against the door trim 102 while the clip locking projection 108 is inserted into the insertion hole 112. As a result, each claw portion 108a of the clip locking projection 108 is elastically engaged with the concave step portion 113 in the insertion hole 112, and the clip 104 is locked to the clip locking projection 108. Is fixed to the door trim 102.

  FIG. 6 is a sectional view showing an engagement relationship between the clip described in FIG. 1 of Patent Document 1 and an EA material molding die. FIG. 6 (a) shows a state before the clip is engaged with the clip fixing protrusion of the EA material molding die, and FIG. 6 (b) shows the clip of the EA material molding die. The state after engaging with the clip fixing protrusion is shown.

  The clip 140 in FIG. 6 includes a rectangular tube-shaped clip body 141 having an insertion hole 142 into which a clip retaining projection (not shown in FIG. 6) for door trim is inserted. The insertion hole 142 penetrates the clip body 141 from one end surface to the other end surface in the cylinder axis direction.

  In the clip 140, the insertion hole 142 has large-diameter portions 142a and 142c on one end side and the other end side in the cylinder axis direction of the clip main body 141, and a small-diameter portion 142b between them. It has become. A convex step 143 that protrudes inward of the insertion hole 142 is formed between the small-diameter portion 142b and the large-diameter portion 142c. On the inner peripheral surface of the small-diameter portion 142, a convex portion 147 that abuts on a later-described clip fixing protrusion 150 is provided.

  On the other end side of the clip body 141, an outward hook-shaped anchor portion 144 is provided, and on the one end side, an outward hook-shaped flange portion 145 is provided. A sealing body 148 in which the insertion hole 142 (large diameter portion 142c) is sealed is attached to the end surface of the clip main body 141 on the anchor portion 144 side.

  When manufacturing the EA material provided with the clip 140, the clip fixing projection 150 protruding from the inner surface of the EA material molding die 160 is inserted into the insertion hole 142, and the clip 140 is molded for the EA material. It is attached to the inner surface of the mold 160. The clip fixing protrusion 150 is inserted into the small diameter portion 142 b of the insertion hole 142. At this time, the clip 140 is locked to the clip fixing protrusion 150 by abutting the side surface of the clip fixing protrusion 150 so that the convex portion 147 of the inner peripheral surface of the small-diameter portion 142b is compressed. Thereafter, the foamed synthetic resin material is foamed in the EA material molding die 160 to mold the EA material body, whereby the EA material in which the clip 140 is integrated is manufactured.

  When the EA material provided with the clip 140 is attached to the door trim, the clip locking protrusion provided on the door trim is pushed into the insertion hole 142 in the same manner as in the EA material attachment structure of FIG. The claw portion of the clip locking projection is engaged with the convex step portion 143.

JP 2005-47225 A

  The clip 104 shown in FIG. 5 is configured to engage each claw portion 108a of the clip locking projection 108 with a concave step portion 113 provided in the inner peripheral surface of the insertion hole 112. However, since the concave step portion 113 has an undercut shape, when the clip 104 is molded by injection molding or the like, the clip molding die has a complicated structure, which takes time and effort to manufacture. Become high.

  In the clip 140 of FIG. 6, the claw portion of the clip locking projection is engaged with the convex step portion 143 protruding from the inner peripheral surface of the insertion hole 142 to the inside of the insertion hole 142. Therefore, there is no undercut portion in the insertion hole 142. Therefore, the clip 140 can be manufactured using a clip molding die having a relatively simple structure.

  However, when manufacturing the EA material including the clip 140, the clip fixing protrusion 150 of the EA material molding die 160 is inserted into the small-diameter portion 142b of the insertion hole 142, and the clip 140 is inserted into the EA material molding die 160. When fixed inside, there is a gap between the inner peripheral surfaces of the large-diameter portions 142a and 142c on both sides of the small-diameter portion 142b and the clip-fixing projection 150 by the amount of this convex step portion 143. Therefore, in order to prevent the foamed synthetic resin from entering the gap during foam molding of the EA material main body, the sealing body 148 is provided on the end surface of the clip main body 141 on the anchor portion 144 side as described above, and the insertion hole 142 (large It is necessary to block the aperture 142c).

  The present invention provides a clip that can be manufactured using a mold having a relatively simple structure and can eliminate the need to provide a sealing body that closes an insertion hole on the end surface of the clip body. For the purpose. The present invention also provides a foam molded member that is integrated with the foam molded body so that the clip is embedded in the foam molded body, a method for producing the foam molded member, and the foam molded member to be attached. It aims at providing the attachment structure attached to the member.

The clip of the present invention (Claim 1) is a clip for attaching a foamed molded article to a member to be attached, and a tube having an insertion hole into which a clip locking projection provided on the member to be attached is inserted. A clip body, and an engaging portion provided on an inner peripheral surface of the insertion hole, with which the clip locking projection engages, the insertion hole is configured to have the clip body at the center of the cylinder. In the clip that penetrates in the linear direction and is integrated with the foamed molded body so that at least one end side of the clip body in the cylinder axis direction is embedded in the foamed molded body, the engaging portion is: becomes the through hole penetrating the clip body from the outer circumferential side to the insertion hole, the thickness T of the clip body in the entire peripheral portion of the through hole, the top of the through hole in the cylinder axial line direction of the clip body which is characterized in that 60 to 200% of the substantial H A.

Clip according to claim 2, in claim 1, the thickness T of the clip body in the entire peripheral portion of the front SL through hole 100 of the maximum width H of the through hole in the cylinder axial line direction of the clip body It is characterized by being 150%.

Clip according to claim 3, in claim 2, the thickness T of the clip body in the entire peripheral portion of the front SL through hole is substantially the maximum width H of the through hole in the cylinder axial line direction of the clip body Are of the same size.

According to a fourth aspect of the present invention, in the clip according to any one of the first to third aspects, the clip body is made of an injection molded product of synthetic resin.

The clip according to claim 5 is characterized in that, in any one of claims 1 to 4, an anchor portion that projects radially from the outer peripheral surface of the clip body is provided on the one end side of the clip body. It is what.

The foam-molded member of the present invention (invention 6 ) has a foam-molded article and the clip according to any one of claims 1 to 5 , and the clip is at least a cylinder axis of the clip body. One end side in the direction is embedded in the foamed molded product to be integrated with the foamed molded product.

The method for manufacturing a foam molded member according to the present invention (Claim 7 ) is a method for manufacturing the foam molded member according to Claim 6 , and is a clip fixing provided on the inner surface of a mold for molding a foam molded body. A clip mounting step of inserting a projection for insertion into the insertion hole and attaching the clip to an inner surface of the foam molded body molding mold, and foam molding in which the foam molded body is foam molded in the foam molded body molding mold And the clip fixing protrusion is configured such that the outer peripheral surface thereof is in close contact with the inner peripheral surface of the insertion hole when inserted into the insertion hole. Is.

The foam molded member mounting structure according to the present invention (Claim 8 ) is a structure in which the foam molded member according to Claim 6 is mounted on a mounted member, and the clip locking projection is provided on the mounted member. The foam molding member is attached to the attached member by inserting the clip locking projection into the insertion hole of the clip and engaging with the engaging portion.

According to a ninth aspect of the present invention, there is provided the foam molded member mounting structure according to the eighth aspect , wherein the clip locking projection includes a projecting portion projecting from the mounted member and a claw portion projecting laterally from the projecting portion. The claw portion is engaged with the engaging portion.

  In the clip of the present invention (Claim 1), the clip locking projection provided on the attached member is inserted into the insertion hole of the clip body, and the clip locking projection engages with the inner peripheral surface of the insertion hole. By being engaged with the portion, it is locked to the attached member. In this invention, this engaging part consists of a through-hole which penetrated the clip main body from the outer peripheral side to the insertion hole. That is, in the present invention, there is no undercut portion such as the concave step portion 113 in the clip 104 of FIG. 5 described above on the inner peripheral surface of the insertion hole. Therefore, the clip of the present invention can be manufactured using a mold having a relatively simple structure.

  Further, in the present invention, there is no step portion projecting inward of the insertion hole, such as the convex step portion 143 of the clip 140 of FIG. 6 described above, on the inner peripheral surface of the insertion hole. Therefore, when manufacturing a foam molded member provided with this clip, when the clip fixing projection of the foam molded body mold is inserted into the insertion hole and the clip is attached to the inner surface of the foam molded body mold In addition, the clip fixing protrusion can be brought into close contact with the inner peripheral surface of the insertion hole. This prevents the foam molding material from entering between the insertion hole and the clip fixing projection during molding of the foam molded body without providing a sealing body on the end face of the clip main body and closing the insertion hole. It is possible.

  As described above, in the present invention, the clip can be manufactured using a mold having a relatively simple structure, and it is unnecessary to provide a sealing body for closing the insertion hole on the end surface of the clip body. Therefore, the clip can be configured at low cost.

  Whether or not the foam molding material enters the through hole from the outer peripheral side of the clip body during molding of the foam molded body depends on the size of the inlet portion of the through hole opened on the outer peripheral surface of the clip body, but is temporarily foamed into the through hole. Whether or not the foamed molding material reaches the inner peripheral surface of the insertion hole through the through-hole when the molding material enters is determined from the outer peripheral surface of the clip body through the through-hole. It depends on the distance to reach the peripheral surface, that is, the thickness of the clip body. In the present invention, the thickness of at least the periphery of the through hole of the clip main body is such that the foam molding material that has entered the through hole from the outer peripheral side of the clip main body when the foam molded body is formed can reach the inner peripheral surface of the insertion hole. Therefore, even if the foam molding material enters the through-hole, it is prevented that the foam-molding material fills the through-hole, and the clip locking projection is engaged with this through-hole. It is possible to function as an engaging portion. Thereby, it is unnecessary to provide a sealing body or the like so as to close the through hole from the outer peripheral side of the clip body, and the configuration of the clip can be simplified.

As in Claim 1, 2, on heuristics, the thickness of the peripheral portion of at least the through hole of the clip body, from 60 to 200% especially 100 to the maximum width of the through-hole in the cylinder axial line direction of the clip body By setting it to 150%, even if the foam molding material penetrates into the through hole during molding of the foam molded body, the foam molding material is prevented from reaching the inner peripheral surface of the insertion hole through the through hole. Is possible.

In particular, as claimed in claim 3, by making the thickness of at least the peripheral portion of the clip body the same as the maximum width of the through hole in the direction of the axis of the clip body, Even when the foam molding material enters the through hole during molding of the foam molding, it is possible to prevent the foam molding material from reaching the inner peripheral surface of the insertion hole through the through hole.

As described in claim 4 , the clip of the present invention can be easily manufactured by injection molding of a synthetic resin using a mold having a relatively simple structure.

As described in claim 5, an anchor portion projecting radially from the outer peripheral surface of the clip body is provided on one end side of the clip body, and the clip is integrated with the foam molded body so that the anchor portion is embedded in the foam molded body. As a result, the effect of retaining the clip from the foam molded body is improved, and a foam molded member having a high bond strength between the clip and the foam molded body can be obtained.

Since the foam-molded member of the present invention (Claim 6 ) includes the clip of the present invention, it can be manufactured at a relatively low cost.

In the method for manufacturing a foam molded member according to the present invention (Claim 7 ), the clip fixing projection provided on the inner surface of the foam molded body molding die is inserted into the insertion hole of the clip, and the clip is foam molded. To attach the clip fixing projection to the inner peripheral surface of the insertion hole when it is attached to the inner surface of the body molding die, a sealing body is provided on the end surface of the clip body so that the insertion hole is not blocked. It is possible to prevent the foamed synthetic resin from entering between the insertion hole and the clip fixing protrusion when the foamed molded body is molded.

In the foam molded member mounting structure of the present invention (Claim 8 ), the foam locking member can be easily foamed by inserting the clip locking projection of the mounted member into the clip insertion hole and engaging with the engaging portion. The molded member can be attached to the attached member.

According to the ninth aspect of the present invention, the clip locking projection is provided with a claw portion that protrudes to the side, and the claw portion is engaged with the engagement portion (through hole) of the clip so that the clip is firmly attached to the clip. It can be locked to the stop projection.

It is explanatory drawing of the clip which concerns on embodiment. It is explanatory drawing of the manufacturing method of the clip of FIG. It is explanatory drawing of the manufacturing method of the foaming molding member provided with the clip of FIG. It is explanatory drawing of the attachment structure which attached the foaming molding member of FIG. 3 to the to-be-attached member. It is explanatory drawing of the attachment structure of the clip which concerns on a 1st prior art example, and a foaming molding member using this clip. It is sectional drawing which shows the engagement relation of the clip concerning a 2nd prior art example, and this clip and a metal mold | die for foaming molding.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the foam molded member is an EA material, and an example of an attachment structure in which the EA material is attached to a door trim as a member to be attached is illustrated. However, the foam molded member of the present invention is an EA material. It is not limited to. Moreover, in this invention, a to-be-attached member is not limited to a door trim.

  FIG. 1 (a) is a cross-sectional perspective view taken along the center axis of the clip body of the clip according to the embodiment, and FIG. 1 (b) is taken along line BB in FIG. 1 (a). Fig. 1 (c) is a cross-sectional view taken along the line CC of Fig. 1 (b) (side view of the clip), and Fig. 1 (d) is a view taken along line D of Fig. 1 (a). It is an expanded sectional view of a part. FIG. 2 (a) is a longitudinal sectional view (a sectional view taken along the line AA in FIG. 2 (b)) of a clip molding die for manufacturing the clip, and FIG. 2 (b). FIG. 2 is a cross-sectional view taken along line BB in FIG. 2 (a), and FIG. 2 (c) is a vertical cross-sectional view of the same portion as FIG. 2 (a) in the mold open state of this clip-molding mold. FIG. FIG. 3 (a) is a longitudinal sectional view of an EA material molding die for producing an EA material as a foam molding member provided with this clip, and FIG. 3 (b) is a diagram to which the clip is attached. FIG. 3 (c) is an enlarged cross-sectional view of the vicinity of a clip fixing protrusion of the previous EA material molding die, and FIG. 3 (c) is a cross-sectional view taken along the line CC of FIG. 3 (b). ) Is a cross-sectional view of the same portion as FIG. 3 (b) showing a state in which the clip is attached to the clip fixing protrusion. FIGS. 3A, 3B, and 3D are each shown in a cross section along the axial center line of the clip fixing projection. FIG. 4 (a) is a horizontal sectional view of a mounting structure in which the EA material is attached to a door trim as a member to be attached, and FIG. 4 (b) is a horizontal sectional view of the door trim before the EA material is attached. FIG. 4 (c) is a view taken along the line CC of FIG. 4 (b). FIG. 4 (a) shows a cross section along the cylinder axis of the clip body, and FIG. 4 (b) shows a cross section of the same part as FIG. 4 (a).

  As shown in FIGS. 3 (a) and 4 (a), the EA material 1 is an EA material body 2 made of a foamed synthetic resin molding such as rigid urethane foam, and the EA material body 2 is attached to the door trim 20. The clip 10 is provided. The clip 10 is integrated with the EA material body 2 by insert molding. The EA material 1 is attached to the door trim 20 by the clip 10 being locked to a clip locking protrusion 21 (FIGS. 4A to 4C) provided on the door trim 20. A plurality of clips 10 are arranged at predetermined positions on the surface of the EA material body 2 facing the door trim 20, and the EA material mounting surface of the door trim 20 has a positional relationship corresponding to each of these clips 10. A plurality of clip locking protrusions 21 are provided. Details of the clip locking projection 21 will be described later.

The foamed synthetic resin constituting the EA material body 2 preferably has a hardness of 2.5 to 15 kgf / cm ² or less determined by a static compression test of the core portion. This static compression test is performed by the following procedure. That is, first, a sample having a thickness of 50 mm, a width of 50 mm, and a length of 50 mm is obtained from a foamed synthetic resin material used as a constituent material of the EA material body 2. Subsequently, this sample is compressed to a thickness of 20% of the original thickness at a speed of 10 to 50 mm / second in the thickness direction by full surface compression. At that time, the load when the sample was compressed to 50% of the original thickness was measured, and the calculated value obtained by dividing the measured value by the cross-sectional area of the cross section perpendicular to the compression direction of the sample was the foamed synthetic resin material. Of hardness.

  The clip 10 includes a substantially cylindrical clip body 11 having an insertion hole 12 into which the clip locking projection 21 is inserted, and one end side (hereinafter referred to as a distal end side) of the clip body 11 in the cylinder axis direction. From the other end side (hereinafter also referred to as the rear end side) of the clip body 11 in the cylinder axis direction. A flange portion 14 and the like projecting outwardly in a bowl shape are provided. The insertion hole 12 passes through the clip body 11 in the direction of the axis of the cylinder. The inner diameter of the insertion hole 12 is substantially constant from the front end side to the rear end side of the clip body 11. The anchor portion 13 and the flange portion 14 are formed flush with the front end surface and the rear end surface of the clip body 11, respectively. On the inner peripheral surface of the insertion hole 12, there is provided an engaging portion 15 that engages a claw portion 23 described later that protrudes laterally from the clip locking protrusion 21.

  In this embodiment, as shown in FIG. 1 (b), the inner peripheral surface of the insertion hole 12 is a flat surface extending in the chord direction of the insertion hole 12 in a cross section perpendicular to the cylinder axis of the clip body 11. It has the part 12a and the curved part 12b which curved to the convex side on the outer peripheral side of the clip main body 11. As shown in FIG. In this embodiment, as shown in FIG. 1 (b), the inner peripheral surface of the insertion hole 12 sandwiches the cylinder axis of the clip body 11 in the cross section perpendicular to the cylinder axis of the clip body 11. A substantially oval cross-sectional shape having a pair of opposed flat portions 12a, 12a and a pair of curved portions 12b, 12b respectively connecting one end side and the other end side of these flat portions 12a, 12a. It has become.

  As shown in FIG. 1 (a), each flat portion 12a and each curved portion 12b are formed continuously from the front end side to the rear end side of the clip main body 11, respectively. As shown in FIG. 1 (b), these flat portions 12a and 12a extend substantially parallel to each other. The width of each flat portion 12a (the width in the direction orthogonal to the cylindrical axis of the clip main body 11; hereinafter the same) is substantially constant from the front end side to the rear end side of the clip main body 11. The width of each flat part 12a is 20 to 80% of the maximum inner diameter of the insertion hole 12 (the maximum value of the distance between the curved parts 12b and 12b in the direction parallel to the width direction of each flat part 12a), particularly about 30 to 70%. Preferably there is. The distance between the flat portions 12a and 12a is preferably about 70 to 95%, particularly about 80 to 90% of the maximum inner diameter of the insertion hole 12. In this embodiment, the curved portions 12b and 12b have an arcuate cross-sectional shape that is substantially curved with the same radius of curvature, with the axis of the clip body 11 being substantially the center of curvature. . The cross-sectional shape of the insertion hole 12 is not limited to this. For example, only one flat portion 12a may be provided, or three or more flat portions 12a may be provided adjacent to each other in the circumferential direction of the clip body 11 or at intervals. The curved portion 12b may not be curved with the center of the insertion hole 12 as the center of curvature, and the curved portions 12b and 12b may have different curvature centers and radii of curvature. In the present invention, the cross-sectional shape of the insertion hole 12 may be a circular shape without the flat portion 12a, a polygonal shape without the curved portion 12b, or the like.

  In this embodiment, as shown in FIGS. 1B and 1C, the outer peripheral surface of the clip body 11 has a circular cross-sectional shape concentric with the insertion hole 12. The cross-sectional shape of the outer peripheral surface of the clip body 11 is not limited to this. For example, in the cross section perpendicular to the cylinder axis of the clip main body 11, the outer peripheral surface of the clip main body 11 may have a cross-sectional shape similar to the inner peripheral surface of the insertion hole 12. The cross-sectional shape may be different between the outer peripheral surface of the clip body 11 and the inner peripheral surface of the insertion hole 12. The cross-sectional shape of the outer peripheral surface of the clip body 11 may be a polygonal shape such as a quadrangle.

  In this embodiment, as shown in FIGS. 1 (a) and 1 (b), the shapes of the anchor portion 13 and the flange portion 14 as viewed from the extending direction of the cylindrical axis of the clip body 11 are substantially the same. The discs have the same outer diameter. In addition, the shape of the anchor part 13 and the flange part 14 is not limited to this. For example, the anchor portion 13 and the flange portion 14 may have different shapes.

  In the present invention, as shown in FIGS. 1 (a) to 1 (d) and FIG. 2 (c), the clip body 11 is provided with a through hole 16 penetrating the clip body 11 from the outer peripheral side into the insertion hole 12. The engagement portion 15 is provided by the through hole 16. That is, when the clip locking projection 21 is inserted into the insertion hole 12, the claw portion 23 of the clip locking projection 21 enters the through hole 16 and engages with the edge of the through hole 16. Become.

  In this embodiment, as shown in FIGS. 1 (a), 1 (b) and 2 (c), two through holes 16 are provided so as to face each other with the center of the clip body 11 in between. In the present embodiment, these through holes 16 are provided so as to penetrate the respective curved portions 12 b of the insertion hole 12. Each through hole 16 penetrates the clip body 11 in the diameter direction and in a direction parallel to each flat portion 12 a of the insertion hole 12. Each through-hole 16 is disposed in the middle portion of each curved portion 12b in the circumferential direction. In addition, each through hole 16 is disposed at an intermediate portion of the clip body 11 in the cylinder axis direction (that is, each through hole 16 is formed from the front end surface and the rear end surface of the clip body 11 in the cylinder axis direction. Are located equidistant from each other). In this embodiment, as shown in FIG. 1 (c), the opening shape of each through-hole 16 when the clip 10 is viewed from the side is such that two orthogonal sides are parallel to the cylindrical axis of the clip body 11, and It has a substantially square shape extending in a direction orthogonal thereto.

  The number and arrangement of the through holes 16 and the opening shape are not limited to this. For example, only one through hole 16 or three or more through holes 16 may be provided at intervals in the circumferential direction of the insertion hole 12. A through hole 16 may be provided in each flat portion 12 a of the insertion hole 12. The through holes 16 may be provided in both the flat portions 12a and the curved portions 12b of the insertion hole 12, respectively. A through hole 16 may be provided across the adjacent flat portion 12a and curved portion 12b. The opening shape of the through hole 16 can be various shapes depending on the shape of the claw portion 23 of the clip locking projection 21. Alternatively, for example, in order to absorb an attachment error of the clip 10, the through hole 16 may have a long hole shape that is long in the circumferential direction of the clip body 11.

  In the present invention, the thickness (ie, the distance from the outer peripheral surface of the clip main body 11 through the through hole 16 to the inner peripheral surface of the insertion hole 12) T is at least the thickness around the through holes 16 of the clip main body 11. Even if the foamed synthetic resin enters the through holes 16 when the EA material body 2 is molded, the foamed synthetic resin cannot reach the inner peripheral surface of the insertion hole 12 through the through holes 16. ing. In this embodiment, as shown in FIG. 1 (b), the thickness T from the one end side to the other end side in the circumferential direction of each curved portion 12b of the insertion hole 12 in the clip body 11 is such a large value. It has become. The wall thickness T of the clip body 11 may be constant over the entire circumference of the clip body 11 or may be different between the peripheral portion of each through hole 16 and the other portions.

  More specifically, as shown in FIG. 1 (d), the wall thickness T at least around each through hole 16 of the clip body 11 is the maximum thickness of each through hole 16 in the direction of the center axis of the clip body 11. 60 to 200%, particularly 100 to 150% of the large H is preferable. In particular, the thickness T of at least the peripheral portion of each through hole 16 of the clip main body 11 and each penetration of the clip main body 11 in the axial direction of the cylinder axis. The maximum width H of the hole 16 is preferably substantially the same size. As a rule of thumb, by configuring in this way, even if the foamed synthetic resin enters each through-hole 16 when the EA material body 2 is molded, the foamed synthetic resin passes through each through-hole 16 and is inserted into the insertion hole 12. It is possible to prevent reaching the inner peripheral surface of the. In addition, as for the dimension of each part of the clip 10 used for the EA material mounted on a general commercial vehicle, the maximum inner diameter of the insertion hole 12 is about 6 to 12 mm, and the length of the clip body 11 in the cylinder axis direction. Is about 8 to 14 mm, and the maximum width H of each through hole 16 in the direction of the cylinder axis of the clip body 11 is about 4 to 6 mm. Therefore, when the present invention is applied to the clip 10 used for this general vehicle EA material, the wall thickness T in the peripheral portion of at least each through hole 16 of the clip body 11 is preferably about 3 to 12 mm ( About 60 to 200% of the maximum width H of the through-hole 16), particularly preferably about 4 to 9 mm (about 100 to 150% of the maximum width H of the through-hole 16), particularly preferably the maximum width H of the through-hole 16 The size is substantially the same.

  The clip 10 is made of a synthetic resin injection-molded product. As a material constituting the clip 10, for example, an ABS resin, a polypropylene resin, a polycarbonate resin, a polystyrene resin, a polyacetal resin (polyoxymethylene resin), and the like are preferable, but not limited thereto.

  Below, the manufacturing method of this clip 10 is demonstrated. In addition, the following manufacturing methods are examples, and the manufacturing method of the clip 10 is not limited to this.

  As shown in FIGS. 2 (a) to 2 (c), the clip molding die 30 for manufacturing the clip 10 includes an outer peripheral surface of the clip body 11, a surface on the flange portion 14 side of the anchor portion 13, and a flange portion. 14, the first die 31 for molding the half circumference of the surface on the anchor portion 13 side, the outer peripheral surface of the clip body 11, the surface on the flange portion 14 side of the anchor portion 13, and the anchor portion 13 side of the flange portion 14 A second mold 32 that molds the remaining half of the surface of the surface, a third mold 33 that molds the surface of the anchor portion 13 opposite to the flange portion 14, and an anchor portion 13 of the flange portion 14. And a fourth die 34 for molding the opposite surface.

  Of the first mold 31 and the second mold 32, through-hole forming convex portions 35 for forming the through-holes 16 are provided so as to project from the cavity surface that molds the outer peripheral surface of the clip body 11. Yes. From the cavity surface of the third mold 33, an insertion hole forming convex portion 36 for forming the insertion hole 12 is projected. As shown in FIG. 2 (b), the insertion hole forming convex portion 36 has a shape whose cross-sectional shape perpendicular to the axial center line substantially matches the cross-sectional shape of the insertion hole 12. That is, the outer peripheral surface of the insertion hole forming convex portion 36 has a pair of flat portions 36a for forming the flat portions 12a of the insertion holes 12 and a pair of curved portions 36b for forming the curved portions 12b. It has a substantially oval cross-sectional shape.

  In this embodiment, the first die 31 and the second die 32 are located near the middle in the width direction of the flat portions 36a, 36a of the insertion hole forming convex portion 36 as shown in FIG. 2 (b). It is divided into two parts. The first mold 31 and the second mold 32 can be separated in a direction parallel to the extending direction of the flat portions 36a of the insertion hole forming convex portion 36. Each of the through-hole forming convex portions 35 is provided with an axial center line in a direction parallel to the separation direction of the first die 31 and the second die 32. The third mold 33 and the fourth mold 34 can be separated from the first mold 31 and the second mold 32 in the extending direction of the axial center line of the insertion hole 12.

  As shown in FIGS. 2 (a) and 2 (b), when these molds 31 to 34 are combined and clamped, the tip of the insertion hole forming convex portion 36 is the cavity surface of the fourth mold 34. The tip of each through-hole forming convex portion 35 is in contact with each curved portion 36 b on the outer peripheral surface of the insertion hole forming convex portion 36. The insertion hole forming convex portion 36 may protrude from the cavity surface of the fourth die 34. Alternatively, one half side of the insertion hole forming convex portion 36 protrudes from the cavity surface of the third die 33 and the other half side of the insertion hole forming convex portion 36 protrudes from the cavity surface of the fourth die 34. It may be configured such that the tips of the convex portions 36 and 36 come into contact with each other when the mold is clamped.

  As shown in FIGS. 2 (a) and 2 (b), these molds 31 to 34 are combined and clamped, and then the molding material for the clip 10 is injected into the mold. After the molding material is cured, the mold is opened as shown in FIG. The portions where the insertion hole forming convex portions 36 existed at the time of molding become the insertion holes 12 after demolding, and the portions where the through hole forming convex portions 35 existed respectively removed the clip body 11 from the outer peripheral side. The through hole 16 penetrates to the insertion hole 12. Thereafter, the clip 10 is completed by performing finishing work such as deburring as necessary.

  Next, the manufacturing method of the EA material 1 provided with this clip 10 is demonstrated. In addition, the following manufacturing methods are an example and the manufacturing method of the EA material 1 is not limited to this.

  The EA material molding die 40 shown in FIG. 3A includes an upper die 41 and a lower die 42. The configuration of the EA material molding die 40 is not limited to this. In this embodiment, in the EA material molding die 40, the EA material body 2 is molded with the surface facing the door trim 20 facing upward. From the cavity surface of the upper mold 41, a clip fixing projection 43 for fixing the clip 10 to the cavity surface is projected. A plurality of clip fixing projections 43 are arranged on the cavity surface of the upper die 41 in a positional relationship corresponding to the arrangement of the clip 10 described above.

  In this embodiment, as shown in FIGS. 3 (a) to 3 (d), the clip fixing projection 43 is a shaft portion protruding from the cavity surface of the upper mold 41 to the inside of the EA material molding die 40. 43a. As shown in FIG. 3 (c), the cross-sectional shape perpendicular to the axial center line of the shaft portion 43 a is substantially similar to the insertion hole 12 of the clip 10. That is, the outer peripheral surface of the shaft portion 43a also has a substantially oval shape having a pair of flat portions 43b corresponding to the flat portions 12a of the insertion hole 12 and a pair of curved portions 43c corresponding to the curved portions 12b. It has a cross-sectional shape. The shaft portion 43a has such a thickness that the outer peripheral surface thereof is substantially in close contact with the inner peripheral surface of the insertion hole 12 when inserted into the insertion hole 12 of the clip 10 (preferably, the clip fixing protrusion 43 is inserted. When inserted into the hole 12, 0.05 to 0.5 mm, particularly 0.05 to 0.5 mm between the outer peripheral surface of the shaft portion 43 a and the inner peripheral surface of the insertion hole 12 in a portion other than the overhanging portion 44 described later. (Thickness with a gap of about 0.2 mm).

  As shown in FIG. 3 (d), the height of the shaft 43 a rising from the cavity surface of the upper mold 41 is adjusted so that the clip fixing projection 43 is kept until the flange portion 14 of the clip 10 contacts the cavity surface of the upper mold 41. When inserted into the insertion hole 12, the tip of the shaft portion 43 a is positioned closer to the anchor portion 13 than the through holes 16 and does not protrude from the end surface of the clip body 11 on the anchor portion 13 side. . Specifically, the standing height of the shaft portion 43a is the distance from the end surface on the anchor portion 13 side of the clip body 11 to the end surface on the flange portion 14 side (that is, the length of the clip body 11 in the cylinder axis direction). It is preferable that it is 85-95% of about 85-90% especially.

  In this embodiment, as shown in FIG. 3 (c), a projecting portion 44 is provided on the outer peripheral surface of the shaft portion 43a so as to project slightly laterally from the outer peripheral surface. The protruding height of the protruding portion 44 from the outer peripheral surface of the shaft portion 43a is preferably about 0.05 to 0.2 mm, particularly about 0.05 to 0.1 mm. As shown in FIG. 3 (c), in this embodiment, a pair of overhanging portions 44 is provided on each bending portion 43c of the shaft portion 43a. The end surface on the distal end side in the projecting direction of each projecting portion 44 is a curved surface that is concentrically curved with each curved portion 43c. However, the number, arrangement, and shape of the overhang portions 44 are not limited to this.

  Since the thickness of the clip fixing projection 43 is larger than the inner diameter of the insertion hole 12 by the amount of the overhanging portion 44, the clip fixing projection 43 is press-fitted into the insertion hole 12. That is, in the state where the clip fixing projection 43 is inserted into the insertion hole 12, each overhanging portion 44 bites into the inner peripheral surface of the insertion hole 12, and in the other portions, the outer peripheral surface of the shaft portion 43a is substantially the same. It comes into close contact with the inner peripheral surface of the insertion hole 12. This prevents the clip fixing protrusion 43 from coming out of the insertion hole 12 during foam molding, that is, the clip 10 is prevented from dropping from the clip fixing protrusion 43. In addition, the foamed synthetic resin is prevented from entering between the outer peripheral surface of the clip fixing projection 43 and the inner peripheral surface of the insertion hole 12.

  In addition, each overhang | projection part 44 may each be provided so that it may engage with each through-hole 16 when the clip fixing protrusion 43 is inserted in the insertion hole 12, respectively.

  When the EA material 1 is manufactured, first, in a state where the upper die 41 and the lower die 42 are opened, each clip fixing projection 43 of the upper die 41 has a flange as shown in FIG. The clip 10 is mounted so that the portion 14 faces the inner surface of the cavity of the upper mold 41. At this time, the clip fixing projections 43 are inserted into the insertion holes 12 so that the flat portions 12 a on the inner peripheral surface of the insertion hole 12 are aligned with the flat portions 43 b on the outer peripheral surface of the shaft portion 43 a of the clip fixing projection 43. insert. Thereby, the clip 10 is attached to the cavity surface of the upper mold 41 in a posture in which each through hole 16 (each engagement portion 15) faces a predetermined direction. As described above, in this embodiment, since the clip fixing protrusion 43 is press-fitted into the insertion hole 12 of the clip 10, the clip 10 is firmly fixed so as not to drop off from the clip fixing protrusion 43 during foam molding. . Thereafter, the foamed synthetic resin raw material of the EA material body 2 is injected into the lower mold 42, and the upper mold 41 and the lower mold 42 are clamped to foam the foamed synthetic resin raw material. As shown in FIG. 4A, this foamed synthetic resin expands from the cavity bottom surface of the lower mold 42 to the cavity ceiling surface of the upper mold 41 to fill the cavity space in the mold 40. Thereby, the EA material main body 2 is shape | molded. At this time, the anchor portion 13 of each clip 10, the clip body 11, and the anchor portion 13 side of the flange portion 14 are buried in the foamed synthetic resin, so that each clip 10 is integrated with the EA material body 2. The

  In the clip 10, the wall thickness T of at least the periphery of each through hole 16 of the clip body 11 is such that even if the foamed synthetic resin enters the through holes 16 during molding of the EA material body 2, Since the synthetic resin has such a size that it cannot reach the inner peripheral surface of the insertion hole 12 through each through hole 16, each through hole 16 is filled with the foamed synthetic resin when foaming the EA material body 2. It is possible to prevent each of the through holes 16 from functioning as an engaging portion 15 with which each claw portion 23 of the clip locking projection 21 is engaged.

  After the foamed synthetic resin is cured, the upper mold 41 and the lower mold 42 are opened, and the EA material body 2 and each clip 10 are removed from the mold. Each clip 10 is such that each flange portion 14 is exposed on the surface facing the door trim 20 of the EA material body 2. An insertion hole 12 is opened at the center of the flange portion 14. After removing the mold, the EA material 1 is completed by performing a finishing operation such as deburring as necessary.

  Next, a structure for attaching the EA material 1 to the door trim 20 will be described.

  As described above, the clip engagement protrusions 21 are provided on the EA material mounting surface of the door trim 20 in a positional relationship corresponding to each clip 10 of the EA material 1. As shown in FIGS. 4 (a) to 4 (c), in this embodiment, the clip locking projection 21 includes two protrusions 22 erected from the EA material mounting surface of the door trim 20. . As shown in FIG. 4 (c), each of these protrusions 22 is disposed at a position facing each curved portion 12b on the inner peripheral surface of the insertion hole when inserted into the insertion hole 12. Moreover, these protrusion parts 22 are arrange | positioned at predetermined intervals between each other. These protrusions 22 are made of an elastic synthetic resin, and the protrusions 22 and 22 can be elastically deformed in the approaching direction. In this embodiment, the protrusion 22 is integrally formed of the same material as the door trim 20.

  In this embodiment, the protrusion height of each protrusion 22 from the EA material mounting surface of the door trim 20 is substantially the same as the length of the clip body 11 in the cylinder axis direction as shown in FIG. Or it is a little smaller than that. Specifically, the protrusion height of each protrusion 22 is preferably about 85 to 95%, particularly about 85 to 90% of the length of the clip body 11 in the cylinder axis direction. Thereby, in the state which inserted each protrusion 22 into the insertion hole 12 until the flange part 14 of the clip 10 contact | abutted to the EA material attachment surface of the door trim 20, the front-end | tip of each protrusion 22 is the anchor part 13 side of the clip main body 11. It is designed not to protrude from the end face.

  As shown in FIG. 4 (b), a claw portion 23 is provided on the side surface of each protruding portion 22 so as to project laterally (a direction orthogonal to the protruding direction of the protruding portion 22 from the EA material mounting surface). . Between the protrusions 22 and 22, the claw portions 23 and 23 protrude in opposite directions. In this embodiment, as shown in FIGS. 4 (a) and 4 (b), each claw portion 23 has a tapered shape in which the protruding height from the side surface of the protruding portion 22 becomes smaller toward the distal end side of each protruding portion 22. It has become.

  The configuration of the clip locking projection 21 is not limited to this. For example, when the through holes 16 are provided in all four surfaces of the flat portions 12a and the curved portions 12b of the insertion hole 12, the clip locking projections 21 are formed on the flat portions 12a and the curved portions 12b. The four projections 22 are arranged so as to face each other, and the four claw portions 23 project from the projections 22 so as to be engaged with the respective through holes 16. May be.

  When attaching the EA material 1 to the door trim 20, the EA material 1 is pressed against the door trim 20 while inserting the clip locking projections 21 of the door trim 20 into the insertion holes 12 of the corresponding clips 10 of the EA material 1. At this time, in each clip locking projection 21, each claw portion 23 is pressed against the inner peripheral surface of the insertion hole 12, so that the protruding portions 22 and 22 are inserted into the insertion hole 12 while being bent in the approaching direction. . Then, as shown in FIG. 4 (a), when the projecting portions 22 and 22 are inserted into the insertion holes 12 until the flange portion 14 of the clip 10 contacts the EA material mounting surface of the door trim 20, each claw portion 23 passes through each of the through-holes 23. Reach hole 16. As a result, the force that has bent the protrusions 22 and 22 in the approaching direction is released, and the protrusions 22 and 22 are restored to their original shapes, whereby each claw 23 enters each through-hole 16. The edge of the through hole 16 (that is, the engaging portion 15) is engaged. Thereby, each clip 10 is latched by each clip latching protrusion 21, and the EA material 1 is attached to the door trim 20.

<Operation effect of clip 10>
As described above, in the clip 10 of the present invention, the engaging portion 15 is formed by the through hole 16 that penetrates the cylindrical clip body 11 from the outer peripheral side to the insertion hole 12. That is, the clip 10 does not have an undercut portion in the insertion hole 12. Therefore, the clip 10 can be easily manufactured by injection molding using a mold 30 having a simple structure as shown in FIGS. 2 (a) to 2 (c).

  Further, in the clip 10 of the present invention, the stepped portion that protrudes inward of the insertion hole 12 is not formed on the inner peripheral surface of the insertion hole 12. Therefore, as shown in FIGS. 3 (a) and 3 (d), when the EA material body 2 is foam-molded, the clip fixing projection 43 of the EA material molding die 40 is inserted into the insertion hole 12, and the clip 10 is inserted. When attached to the EA material molding die 40, the outer peripheral surface of the shaft portion 43 a of the clip fixing projection 43 can be brought into close contact with the inner peripheral surface of the insertion hole 12. Thereby, even if the sealing body is not provided on the end surface of the clip body 12 on the anchor portion 13 side and the insertion hole 12 is not blocked, the foamed synthetic resin is inserted into the insertion hole 12 and the clip fixing projection 43 when the EA material body 2 is molded. Can be prevented from entering between.

  As described above, in the present invention, the clip 10 can be manufactured using the mold 30 having a relatively simple structure, and it is not necessary to provide a sealing body that closes the insertion hole 12. Therefore, the clip 10 can be configured at a low cost.

  In the present invention, the thickness T of at least the periphery of each through hole 16 of the clip body 11 is determined by the insertion of the foamed synthetic resin that has entered the through holes 16 from the outer peripheral side of the clip body 11 when the EA material body 2 is molded. Since the size cannot reach the inner peripheral surface of the EA material body, even if the foamed synthetic resin enters the through holes 16 when the EA material body 2 is molded, the through holes 16 are filled with the foamed synthetic resin. Therefore, each through hole 16 can function as an engaging portion 15 with which the claw portion 23 of the clip locking projection 21 is engaged. Thereby, it is not necessary to provide a sealing body or the like so as to close each through hole 16 from the outer peripheral side of the clip main body 11, and the configuration of the clip 10 can be simplified.

  As described above, as a rule of thumb, the thickness T of at least the periphery of each through hole 16 of the clip body 11 is preferably 60, which is the maximum width H of each through hole 16 in the direction of the center axis of the clip body 11. When the EA material body 2 is molded, the foamed synthetic resin temporarily enters each through-hole 16 by making the size substantially the same as the maximum width H. However, it is possible to prevent this foamed synthetic resin from reaching the inner peripheral surface of the insertion hole 12 through each through hole 16.

  In this embodiment, an anchor portion 13 is provided on one end side of the clip body 11 so as to project radially from the outer peripheral surface of the clip body 11, and the anchor portion 13 is embedded in the EA material body 2. Therefore, the retaining effect of the clip 10 from the EA material body 2 is high.

  The EA material 1 including the clip 10 of the present invention can be manufactured at a relatively low cost.

  In the present invention, when the EA material 1 is manufactured, the clip fixing projection 43 of the EA material molding die 40 is inserted into the insertion hole 12 of the clip 10, and the clip 10 is inserted into the inner surface of the EA material molding die 40. When the EA material body 2 is molded, the clip fixing projection 43 is brought into close contact with the inner peripheral surface of the insertion hole 12 so that the end surface of the insertion hole 12 is not covered with a seal. The foamed synthetic resin is prevented from entering between the insertion hole 12 and the clip fixing projection 43.

  In the mounting structure of the EA material 1 of the present invention, the clip locking projection 21 of the door trim 20 is inserted into the insertion hole 12 of the clip 10 and engaged with the engaging portion 15, so that the EA material 1 can be easily obtained. Can be attached to the door trim 20.

  In this embodiment, the clip locking projection 21 is provided with a claw portion 23 projecting sideways, and this claw portion 23 is engaged with the engaging portion 15 (through hole 16) of the clip 10. The clip 10 can be securely locked to the clip locking protrusion 21.

  Each of the above embodiments is an example of the present invention, and the present invention may take other forms.

  Although the above embodiment shows an application example of the present invention to the EA material, its mounting clip, and its mounting structure to the door trim, the present invention is a foam molding member other than this and its mounting clip. , As well as its mounting structure.

1 EA material (foam molding member)
2 EA material body (foam molded body)
DESCRIPTION OF SYMBOLS 10 Clip 11 Clip main body 12 Insertion hole 13 Anchor part 14 Flange part 15 Engagement part 16 Through-hole 20 Door trim (attachment member)
21 Protrusion for clip locking 22 Protrusion 23 Claw 30 Die for clip molding 35 Protrusion for through hole formation 36 Protrusion for insertion hole formation 40 EA material molding die 43 Protrusion for clip fixing

Claims (9)

A clip for attaching the foam molded body to the attached member,
A cylindrical clip body having an insertion hole into which a clip locking protrusion provided on the attached member is inserted;
An engagement portion provided on the inner peripheral surface of the insertion hole, with which the clip locking projection engages;
The insertion hole passes through the clip body in the direction of the axis of the cylinder,
In the clip that is integrated with the foamed molded body so that at least one end side of the clip body in the cylinder axis direction is embedded in the foamed molded body,
The engaging portion comprises a through hole that penetrates the clip body from the outer peripheral side to the insertion hole,
Clip, characterized in that the wall thickness T of the clip body in the entire peripheral portion of the through hole is 60 to 200% of the maximum width H of the through hole in the cylinder axial line direction of the clip body. Characterized in that in claim 1, the thickness T of the clip body in the entire peripheral portion of the front SL through hole is 100 to 150% of the maximum width H of the through hole in the cylinder axial line direction of the clip body And clip. In claim 2, the thickness T of the clip body in the entire peripheral portion of the front SL through holes is substantially the maximum width H of the through hole in the cylinder axial line direction of the clip body is the same size A clip characterized by that.   The clip according to any one of claims 1 to 3, wherein the clip body is made of an injection molded product of synthetic resin.   The clip according to any one of claims 1 to 4, wherein an anchor portion that projects radially from an outer peripheral surface of the clip body is provided on the one end side of the clip body. A foam molded body,
A clip according to any one of claims 1 to 5,
The foam molded member is characterized in that the clip is integrated with the foam molded body by at least one end side of the clip body in the cylinder axis direction being embedded in the foam molded body. A method for producing the foam molded member according to claim 6, comprising:
A clip attaching step of inserting a clip fixing protrusion provided on the inner surface of the foam molded article molding die into the insertion hole and attaching the clip to the inner surface of the foam molded article mold;
A foam molding step of foam-molding the foam-molded body in the mold for molding the foam-molded body,
The method for producing a foam-molded member, wherein the clip fixing protrusion is configured so that an outer peripheral surface thereof is in close contact with an inner peripheral surface of the insertion hole in a state of being inserted into the insertion hole. The foam molded member according to claim 6 is attached to a member to be attached,
A clip locking projection is provided on the attached member;
The foam molded member mounting structure in which the foam molded member is mounted to the mounted member by inserting the clip locking projection into the insertion hole of the clip and engaging the engaging portion.   9. The clip locking protrusion according to claim 8, wherein the clip locking protrusion includes a protruding portion protruding from the attached member and a claw portion protruding laterally from the protruding portion, and the claw portion engages with the engaging portion. A mounting structure for a foam-molded member.

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