Resin molded product

Abstract

To provide a resin molded article capable of securing the strength of a clip attachment portion while suppressing the occurrence of defects.SOLUTION: A body part (30) having a design surface (DS) and a clip attachment portion (40) formed on a back surface (BS) of the design surface (DS) of the body part (30) and allowing attachment of a clip are integrally formed in a resin molded article (20). The clip attachment portion (40) includes a mounting wall (41) rising from the back surface (BS) and ribs (43) extending from the mounting wall (41) along the back surface (BS) to reinforce the mounting wall (41). A through hole (41c) is drilled through the mounting wall (41) at a location adjacent to the rib (43) in the mounting wall (41).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a resin molded product that is attached to a workpiece via a clip. [Background technology]

[0002] Resin molded products are sometimes attached to vehicle bodies for the purpose of decorating the vehicle. When attaching the resin molded product, for example, a clip is attached to the resin molded product and the clip is pushed into a hole opened in the vehicle body. As a conventional technique related to such resin molded products, there is a technique disclosed in Patent Document 1.

[0003] The resin molded product shown in Patent Document 1 is integrally formed with a main body having a design surface and a clip attachment portion formed on the back side of the design surface of the main body and capable of attaching a clip. The clip attachment portion has an attachment wall portion standing up from the back side and a rib extending from the attachment wall portion along the back side to reinforce the attachment wall portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-67115 A Summary of the Invention [Problem to be solved by the invention]

[0005] According to the inventor's research, it was found that a concave defect called a sink mark can occur on the design surface of a resin molded product having a clip attachment part and a rib on the back side. It was also found that such a defect is likely to appear on the design surface side in the part corresponding to the boundary part between the clip attachment part and the rib. In order to suppress such a defect, it is possible to not form the rib, but in this case, there is a risk that sufficient strength of the clip attachment part cannot be secured.

[0006] An object of the present disclosure is to provide a resin molded product that can ensure the strength of a clip attachment portion while suppressing the occurrence of defects. [Means for solving the problem]

[0007] According to the present disclosure, there is provided a resin molded product in which a main body having a design surface and a clip attachment portion formed on a back surface of the design surface of the main body and capable of attaching a clip are integrally formed, The clip attachment portion includes an attachment wall portion rising from the back surface, and a rib extending from the attachment wall portion to the back surface and reinforcing the attachment wall portion, There is provided a resin molded product, characterized in that a through hole portion penetrating the mounting wall portion is formed at a position adjacent to the rib on the mounting wall portion. Effect of the Invention

[0008] The present invention can provide a resin molded product that can ensure the strength of the clip attachment portion while suppressing the occurrence of defects. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1A is a perspective view of a vehicle to which a resin molded product according to an embodiment is attached, and FIG. 1B is a perspective view of the resin molded product shown in FIG. 1A as viewed from the rear side. [Diagram 2] FIG. 2 is an enlarged view of part 1B of FIG. [Diagram 3] 3 is a cross-sectional view taken along line 3-3 of FIG. 2. [Figure 4] 4 is a cross-sectional view taken along line 4-4 of FIG. 2. [Diagram 5] FIG. 5A is a diagram for explaining the function of a resin molded product according to a comparative example, and FIG. 5B is a diagram for explaining the function of a resin molded product according to an example. [Figure 6] FIG. 4 is a diagram illustrating a modification of FIG. 3. [Figure 7] FIG. 5 is a diagram illustrating a modification of FIG. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of the present invention will be described below with reference to the attached drawings. In the description, left and right refer to left and right with respect to the occupant of the vehicle to which the resin molded product is attached, and front and rear refer to front and rear with respect to the traveling direction of the vehicle. In the drawings, Fr indicates front, Rr indicates rear, Le indicates left as seen by the occupant, Ri indicates right as seen by the occupant, Up indicates up, and Dn indicates down.

[0011] <Example> The embodiment will be described with reference to the drawings.

[0012] Please refer to Fig. 1A. Fig. 1A shows a perspective view of a vehicle 10 as seen from the rear. The resin molded product 20 is attached to the vehicle 10 as a mounting member via a clip, for example. The resin molded product 20 is, for example, a decorative part attached to the vehicle body 12 above the license plate 11.

[0013] Please also refer to Fig. 1B. Fig. 1B shows the resin molded product 20 as viewed from the front. The resin molded product 20 is a resin part formed by resin molding such as injection molding. The resin molded product 20 is integrally formed with a main body 30 having a design surface DS, which is the rear surface, and a clip attachment portion 40 formed on a back surface BS of the design surface DS of the main body 30 and to which a clip can be attached. A plurality of clip attachment portions 40 may be formed on the back surface BS.

[0014] The resin molded product 20 can be made of any resin.

[0015] Please refer to Figures 2 to 4. The edge of the main body 30 is a bent portion 31 that is bent forward. In other words, the main body 30 includes the bent portion 31. The tip of the bent portion 31 is a seal attachment portion 31a to which a seal 51 can be attached. A primer is applied to the seal attachment portion 31a to improve the adhesion of the seal 51.

[0016] For example, after manufacturing, the resin molded product 20 is checked visually or by a camera to see if there are any concave portions called sink marks on the design surface DS (see FIG. 1). At this time, a primer is applied to the seal attachment portion 31a of the resin molded product 20 that has no defects on the design surface DS, including the bent portion 31, and a seal is attached.

[0017] The clip mounting portion 40 has a mounting wall portion 41 that rises from the back surface BS, a clip support portion 42 that covers the tip of the mounting wall portion 41 and supports the attached clip, and a plurality of ribs 43 that extend from the mounting wall portion 41 to the back surface BS and reinforce the mounting wall portion 41.

[0018] The mounting wall portion 41 has a wall main body 41a rising from the back surface BS, and a protruding portion 41b protruding from the wall main body 41a toward the bending portion 31. The mounting wall portion 41 is provided with through-holes 41c penetrating the mounting wall portion 41. The through-holes 41c are formed corresponding to the respective ribs 43. The tip of the protruding portion 41b may extend to the bending portion 31.

[0019] The protruding portion 41b is inclined obliquely with respect to the bent portion 31, and is formed in a stepped shape with the through hole portion 41c in between. It can also be said that the portion 41b2 on the other side is offset with respect to the extension line EL of the portion 41b1 on one side with the through hole portion 41c in between. In addition, the boundary portion 44 between the protruding portion 41b (mounting wall portion 41) and the rib 43 is formed in a curved shape.

[0020] The clip support portion 42 has a generally C-shaped opening 42a that opens in one direction so that the clip can be slid and attached. A portion of the attachment wall portion 41 that corresponds to the clip opening 42a is also open.

[0021] A semi-closed space in which only one side surrounded by the mounting wall portion 41 and the clip support portion 42 is open can be formed by providing a slide block corresponding to the shape of the semi-closed space when molding the clip mounting portion 40, and then moving it in the direction of the opening of the mounting wall portion 41 after molding to remove it from the mold.

[0022] Please refer to Fig. 6. Through-hole portion 41c is formed on a straight line connecting adjacent protrusions 41b. In other words, protrusions 41b are formed on the same plane without any steps. Protrusions 41b are preferably formed in a stepped shape (see Fig. 3), but may be formed on the same plane. The reason will be described later.

[0023] Please refer to Fig. 7. The mounting wall portion 41 may have a configuration in which the protruding portion 41b protrudes directly from the clip support portion 42 toward the bent portion 31 without having the wall main body 41a (see Fig. 4).

[0024] The above-described resin molded product 20 will be summarized below.

[0025] Please refer to Fig. 2. First, the resin molded product 20 is integrally formed with a main body 30 having a design surface DS (see Fig. 1) and a clip attachment portion 40 formed on a back surface BS of the design surface DS of the main body 30 and capable of attaching a clip. The clip attachment portion 40 includes an attachment wall portion 41 rising from the back surface BS, and a rib 43 extending from the attachment wall portion 41 to the back surface BS and reinforcing the attachment wall portion 41. A through-hole portion 41c penetrating the attachment wall portion 41 is formed at a position adjacent to the rib 43 of the attachment wall portion 41.

[0026] Please refer to Fig. 5A. In the resin molded product 120 according to the comparative example, the mounting wall portion 141 (clip mounting portion 140) is formed continuously, and a plurality of ribs 143 extend from the mounting wall portion 141. In the resin molded product 120 having such clip mounting portion 140 and rib 143, it was found that a portion P1 where the clip mounting portion 140 and the rib 143 intersect becomes a waste material where a lot of resin is concentrated, and the design surface DS (see Fig. 1) is likely to become concave.

[0027] Refer to FIG. 5B. In the resin molded product 20 according to the embodiment, a through hole 41c is formed at a position adjacent to the rib 43 of the mounting wall 41, penetrating the mounting wall 41. This can prevent the part where the rib 43 starts from becoming thin. The reason why a concave defect occurs on the design surface DS (see FIG. 1) is that the volume of the resin that shrinks during cooling increases in the thin part, causing the design surface DS to become thin. According to the resin molded product 20, the through hole 41c is formed at the part where the rib 43 starts, so that this part can be prevented from becoming thin. This can prevent the design surface DS from being formed thin. On the other hand, since the mounting wall 41 is reinforced by the rib 43, the strength of the clip mounting part 40 can be sufficiently ensured. It is possible to provide a resin molded product 20 that can ensure the strength of the clip mounting part 40 while preventing the occurrence of defects.

[0028] Refer to Fig. 3. Secondly, in the resin molded product 20 described in the first aspect, the mounting wall 41 (see in particular 41b1 and 41b2 of the protruding portion 41b) is formed in a stepped shape with the through hole portion 41c in between, and the boundary portion 44 between the mounting wall 41 and the rib 43 is formed in a curved shape. This allows the boundary portion 44 between the protruding portion 41b and the rib 43 to be formed in a curved shape, and also allows the thickness from the rib 43 through the curved boundary portion 44 to the protruding portion 41b to be constant, so that the portion where the rib 43 starts does not become wasteful and the occurrence of a concave shape on the design surface can be suppressed.

[0029] Thirdly, in the resin molded product 20 according to either the first or second aspect, at least a part of the edge of the main body 30 is made into a seal attachment portion 31a to which a seal can be attached, and a plurality of ribs 43 are formed toward the seal attachment portion 31a. Also, the through-hole portions 41c are formed corresponding to each of the plurality of ribs 43.

[0030] Refer to Fig. 5A. When attaching a seal to the seal attachment portion 131a, it is common to apply a primer to the seal attachment portion 131a in advance. If the rib 143 is formed in the vicinity of the seal attachment portion 131a, the applied primer flows from the rib 143 toward the attachment wall portion 141. The primer that flows toward the attachment wall portion 141 accumulates in the vicinity of a portion P1 where the attachment wall portion 141 and the rib 143 intersect.

[0031] 5B, in the resin molded product 20, the through-holes 41c are formed corresponding to each of the plurality of ribs 43. Therefore, the primer that flows toward the mounting wall portion 41 passes through the through-holes 41c, and therefore, accumulation of the primer at the boundary portion 44 between the mounting wall portion 41 and the rib 43 can be suppressed.

[0032] Although the present invention has been described with reference to a decorative component attached to the rear of a vehicle, it may also be applied to other components provided outside the vehicle or to components provided inside the vehicle cabin. Furthermore, the present invention may also be applied to components other than those attached to a vehicle, and the present invention is not limited to the embodiments.

[0033] In the embodiment, the resin molded product 20 has the rib 43 formed in the vicinity of the bent portion 31. However, the rib 43 may be formed in a location on the back surface BS other than the bent portion. In other words, as long as the clip attachment portion 40 is formed on the back surface BS, the location where the rib 43 is formed is not limited to the location in the embodiment.

[0034] As long as the functions and effects of the present invention are achieved, the present invention is not limited to the examples. [Industrial Applicability]

[0035] The resin molded article of the present invention is suitable for use as a decorative part for a vehicle. [Explanation of symbols]

[0036] 20…Resin molded product 30…Main body 31a…Seal mounting part 40…Clip attachment part 41...mounting wall portion, 41c...through hole portion 43…Rib 44…Border DS…Design surface BS…Back EL…Extension line

Claims

1. A resin molded product in which a main body having a design surface and a clip attachment portion formed on the back side of the design surface of the main body and capable of attaching a clip are integrally formed, The clip attachment portion includes an attachment wall portion rising from the back surface, and a rib extending from the attachment wall portion to the back surface and reinforcing the attachment wall portion, a through-hole portion penetrating the mounting wall portion is formed at a position adjacent to the rib, The mounting wall portion is formed in a stepped shape with the through hole portion therebetween, A resin molded product, characterized in that a boundary between the mounting wall portion and the rib is formed in a curved shape.

2. A resin molded product in which a main body having a design surface and a clip attachment portion formed on the back surface of the design surface of the main body and to which a clip can be attached are integrally formed, The clip attachment portion includes an attachment wall portion rising from the back surface, and a rib extending from the attachment wall portion to the back surface and reinforcing the attachment wall portion, a through-hole portion penetrating the mounting wall portion is formed at a position adjacent to the rib, At least a part of an edge of the main body portion is a seal attachment portion to which a seal can be attached, The rib is formed in a plurality of portions toward the seal attachment portion, The through-hole portion is formed corresponding to each of the plurality of ribs.

3. At least a portion of the edge of the main body portion is a seal mounting portion to which a seal can be attached, The rib is formed in a plurality of portions toward the seal attachment portion, The resin molded product according to claim 1 , wherein the through-holes are formed corresponding to each of a plurality of the ribs.

Images