JP4337703B2 - Compact - Google Patents

Description

  The present invention relates to a synthetic resin molded body used as a vehicle component such as an overhead console holder or a console box hinge.

Conventionally, as a synthetic resin molded body used as a vehicle component, for example, Patent Document 1 describes an overhead console holder, and Patent Document 2 describes a console box hinge. The hinge described in Patent Document 1 is configured by standing a pair of wall bodies (bearing portions) facing each other on both sides of the lower surface of a rectangular base (bracket). Note that, in the hinge described in Patent Document 1, a locking hole and a through hole are formed through the base at a position corresponding to the base end of each wall body. On the other hand, in the holder described in Patent Document 2, flat plate-like wall bodies are erected on both sides on the surface of a rectangular base (holder body) so as to face each other, and on the outer surface of each wall body. Each has a holder shaft protruding. In the holder described in Patent Document 2, a semi-cylindrical cover wall projects from the outer surface of each wall so as to surround the holder shaft.
Japanese Patent Laid-Open No. 2003-212051 JP 2004-17810 A

  However, in the case of a structure in which a wall body is erected on the surface of a base like the above-described conventional molded body, there is a high possibility that the wall bodies will fall down toward each other due to the shrinkage of the synthetic resin during molding. There is a problem that it is difficult to improve the molding accuracy. For example, in the hinge described in Patent Document 1, one side surface of the wall body and the inner surface of the locking hole or the through hole are flush with each other, and the wall body is the base end of the wall body with respect to the base body. And the base are provided so as to have an L-shaped cross section. For this reason, there is a possibility that the amount of shrinkage differs between the one side surface side and the other side surface side of the wall body, and the pair of wall bodies may fall down so as to go inward. On the other hand, in the case of the holder of Patent Document 2, no consideration is given to such shrinkage, and it is assumed that if the cover wall is omitted, it is impossible to suppress the collapse of the wall body. . Moreover, about the holder of patent document 2, it is estimated that there exists a possibility that a wall body may be distorted, when the shrinkage amount of a wall body and a cover wall differs. Furthermore, the wall body has to be arranged closer to the center of the base body by the space for providing the cover wall, and it is estimated that the accommodation space is reduced.

  The present invention has been made paying attention to such problems existing in the prior art. The object is to provide a molded body capable of improving the molding accuracy.

The invention of the molded body according to claim 1 is used as a vehicle component, and a pair of shaft support bodies each provided with a flat wall on the surface of a rectangular base body are erected so as to face each other. A molded body made of synthetic resin, wherein the surface of the base body is provided with a surface on which the wall body is erected while the surface extending in a direction intersecting with the erected surface is defined as a side surface, Of the surface of the wall body, the surface opposite to the inner surface is defined as an inner surface, and the surface facing the inner surface is defined as an outer surface, and a first reinforcing rib for reinforcing the wall body is formed on the outer surface of the wall body. The thickness of the first reinforcing rib is equal to or thicker than the thickness of the wall body, and the shaft support is pivotally supported with respect to the object. is configured as a bearing member is a vehicle part by the a支体the substrate, and the standing設面of the surface of the substrate The surface of the contralateral includes summarized in that the substrate forms a third reinforcing rib for reinforcing the was thinner than the thickness of the third reinforcing ribs to the thickness of the first reinforcement rib To do.

According to the above configuration, the thickness of the first reinforcing rib for reinforcing the wall body is the same or thicker than the thickness of the wall body. The amount of contraction and the amount of contraction of the outer surface of the wall body provided with the first reinforcing rib can be made comparable. For this reason, it is possible to prevent the wall body from being distorted due to a difference in shrinkage between the outer surface and the inner surface of the wall body. Further, the first reinforcing rib is provided to reinforce the wall body, and it is not necessary to divide a large space in order to provide the first reinforcing rib, and the wall body is brought close to the side edge of the base body. In addition, the wall body can be prevented from falling during molding. In addition, when the wall body is brought close to the side edge of the base body, it is presumed that the base end of the wall body and the base body are likely to have an L-shaped cross section as described above, and the wall body is likely to fall down. Is done. Therefore, it is possible to suppress the difference in shrinkage between the outer surface and the inner surface of the wall body, and as a result, it is possible to improve the molding accuracy.
The invention of the molded body according to claim 2 is characterized in that, in the invention according to claim 1, a step portion is formed between the side surface of the base body and the outer surface of the wall body.
According to the above configuration, since the step portion is formed between the side surface of the base body and the outer surface of the wall body, the base body of the wall body and the base body have a T-shaped cross section with respect to the base body. It is provided as follows. Therefore, at the base end of the wall body, a corner portion (corner portion) formed by the inner surface of the wall body and the standing surface of the base body, and an angle formed by the outer surface of the wall body and the standing surface of the base body. The part (corner part) is disposed to face each other. Therefore, it is possible to suppress the difference in shrinkage between the outer surface and the inner surface of the wall body, and as a result, it is possible to improve the molding accuracy.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein a second reinforcing rib is provided between the standing surface of the base and the inner surface of the wall body. This is the gist.
According to the said structure, the 2nd reinforcement rib can suppress each wall body falling down suitably by supporting each wall body from an inner surface side.

The invention of the molded body according to claim 4 is the gist of the invention according to any one of claims 1 to 3, wherein the synthetic resin is a crystalline resin.
According to the above configuration, even when a crystalline resin having a large shrinkage amount is used, the wall body can be suitably prevented from falling.

  The invention of the molded body according to claim 5 is the invention according to any one of claims 1 to 4, wherein the synthetic resin is a thermoplastic resin and has a molding shrinkage of 0.006 or more. It is a summary.

According to the above configuration, even when a thermoplastic resin having a molding shrinkage rate of 0.006 or more and a large shrinkage amount is used, the wall body can be suitably prevented from falling.
The invention of the molded body according to claim 6 is the gist of the invention according to any one of claims 1 to 5, wherein the wall body has the same thickness as the base body. To do .

  According to the present invention, the molding accuracy can be improved.

Hereinafter, an embodiment in which the molded body of the present invention is embodied in a bearing body of a console box which is a vehicle component will be described.
First, the configuration of the console box will be described. As shown in FIGS. 4A and 4B, the console box 10 includes a box body 11 and a lid 12. The box body 11 is formed in a box shape that opens upward, and the inside of the box body 11 serves as a storage space for storing articles. The lid body 12 is provided to close or open the opening of the box body 11, and is attached to the box body 11 via the bearing body 13. The bearing body 13 is pivotally supported with respect to the box body 11 so as to be rotatable. On the other hand, the bearing body 13 is slidably attached to the slide groove 14 provided on the inner surface of the lid body 12 with respect to the lid body 12. Accordingly, the lid body 12 is configured to open the opening of the box body 11 by sliding around the upper portion of the box body 11 and then rotating around the bearing body 13. The opening of the box body 11 is closed by rotating the lid body 12 around the bearing body 13 and then sliding the lid body 12.

  Next, the configuration of the bearing body 13 will be described. As shown in FIGS. 3A and 3B, the bearing body 13 includes a rectangular base body 21 and a pair of shaft support bodies 22 erected on the lower surface of the base body 21. The base body 21 is a box-like shape that opens upward from a rectangular substrate 23 and a pair of short side walls 24 and a pair of long side walls 25 that are respectively suspended from both short side edges and both long side edges of the substrate 23. Is formed. On the surface of the base body 21, the outer surface of the substrate 23 constituting the lower surface of the base body 21 is a standing surface 26 for standing the shaft support 22. Further, on the surface of the base 21, the outer surfaces of the short side walls 24 and the outer surfaces of the long side walls 25 constituting the side surfaces of the base 21 that are surfaces extending in a direction orthogonal to (intersect) the standing surface 26 are respectively short side surfaces. 27 and a long side surface 28. Each short side surface 27 is provided with two pairs of insertion pins 29 for insertion into the slide groove 14 of the lid 12, one pair each in total.

  The shaft support 22 includes a support wall 31 as a wall body standing from a side edge portion of the standing surface 26, and a bearing portion 32 formed integrally with the support wall 31. The support walls 31 are formed in a substantially quadrangular arc shape when viewed from the side, and the support walls 31 are disposed so as to face each other and extend in parallel between the shaft support bodies 22. The surface of the support wall 31 that faces the other support wall 31 is an inner surface 33, and the surface that faces the inner surface 33 is an outer surface 34.

  As shown in FIGS. 2 and 3A, the outer surface 34 of the support wall 31 is provided with a frame rib 35 that constitutes a reinforcing rib along the periphery of the support wall 31. Further, on the inner side of the frame rib 35, first reinforcing ribs 36 constituting reinforcing ribs are projected in a lattice shape. The support wall 31 is reinforced by the frame ribs 35 and the first reinforcing ribs 36.

  As shown in FIG. 3 (a), the bearing portion 32 is formed in a laterally-bottomed cylindrical shape, and between the shaft support bodies 22, the bearing portions 32 are arranged such that their openings face each other. It is arranged. A cylindrical shaft portion 37 is provided inside the bearing portion 32. A shaft cylinder (not shown) provided inside the box body 11 is inserted into the bearing portion 32 from the opening to the inside, and a shaft pin (not shown) is connected to the shaft portion 37 via the shaft cylinder. Is inserted into the box body 11 so as to be pivotally supported.

  In addition to the frame rib 35 and the first reinforcing rib 36, the bearing body 13 is provided with a reinforcing rib. As shown in FIG. 3B, a plurality of second reinforcing ribs 38 are installed as second reinforcing ribs between the standing surface 26 of the base 21 and the inner surface 33 of the support wall 31. Yes. These second reinforcing ribs 38 are formed to have a triangular shape, and are reinforced to support the support wall 31 so that the support wall 31 does not fall to the inner surface 33 side. Further, as shown in FIG. 3A, in the base body 21, third reinforcing ribs 39 serving as third reinforcing ribs are latticed inside the substrate 23, both short side walls 24, and both long side walls 25. It protrudes in a shape. The third reinforcing rib 39 suppresses the base 21 from being distorted by reinforcing the substrate 23, the short side wall 24, and the long side wall 25.

  The bearing body 13 has a base body 21 and a pair of shaft support bodies 22 integrally formed by injection molding using synthetic resin as a material thereof. As this synthetic resin, a crystalline resin is preferably used. This crystalline resin has a property that molecules are crystallized when solidified from a liquid state, and has high rigidity after solidification. Crystalline resins are roughly classified into thermoplastic resins and thermosetting resins. A thermoplastic resin is a synthetic resin that maintains a softened state when heated and solidifies when cooled. On the other hand, a thermosetting resin is a synthetic resin that maintains a softened state when cooled and solidifies when heated. When the bearing body 13 is formed, it is preferable to use a thermoplastic resin from the viewpoint of easy handling during injection molding. In addition, the thermoplastic resin has a molding shrinkage such as polyacetal (POM), polypropylene (PP), polyacryl (PA), etc. from the viewpoint of easy handling at the time of injection molding and obtaining a desired rigidity after solidification. Is preferably 0.006 (mm / mm) or more.

  In addition, the said mold shrinkage is a value set with reference to the description of the plastic processing technology manual published by Nikkan Kogyo. According to the Plastic Processing Technology Handbook, the molding shrinkage of POM is 0.020 to 0.025 (mm / mm), the molding shrinkage of PP is 0.010 to 0.025 (mm / mm), PA (nylon) ) Molding shrinkage rate is 0.006 to 0.015 (mm / mm).

Next, the characteristic part in the bearing body 13 and its effect | action are demonstrated.
Now, the bearing portion 32 is pivotally supported with respect to the box body 11 from the direction of the inner surface 33 side of the support wall 31 as described above. Therefore, in order to prevent the accommodation space of the box body 11 from being reduced, the distance between the bearing portions 32 is increased, that is, the support wall 31 is disposed as close to the side edge of the standing surface 26 as possible. Is preferred.

  On the other hand, when the support wall 31 is disposed along the side edge of the standing surface 26, the short side surface 27 of the base 21 and the outer surface 34 of the support wall 31 are flush with each other, and the support wall 31 has its base end portion. And the substrate 23 of the base 21 so as to form an L-shaped cross section. In this case, when the bearing body 13 is formed using a thermoplastic resin having a molding shrinkage rate of 0.006 (mm / mm) or more, the inner wall 33 and the outer surface 34 of the support wall 31 shrink due to a difference in shape. A large difference occurs in the amount, and the support wall 31 falls to the inner surface 33 side. When the base end portion of the support wall 31 and the substrate 23 of the base 21 are actually formed so as to have an L-shaped cross section, the tip of the support wall 31 is 1.5-3 from the desired position toward the inner surface 33 side. The position was shifted by 0 mm.

  On the other hand, as shown in FIG. 1, the bearing body 13 is arranged such that the outer surface 34 of the support wall 31 is closer to the center of the base 21 than the short side 27 of the base 21. A step 41 is formed between the short side surface 27 and the short side surface 27. By forming the stepped portion 41, the support wall 31 is formed to have a T-shaped cross section with the base end portion and the substrate 23 of the base 21. In this case, corner portions 42 are formed on both the inner surface 33 side and the outer surface 34 side at the base end portion of the support wall 31. For this reason, when the synthetic resin shrinks, a difference in shrinkage due to a difference in shape between the inner surface 33 side and the outer surface 34 side hardly occurs. Accordingly, the falling of the support wall 31 toward the inner surface 33 is suppressed.

  In the bearing body 13, the thickness a of the first reinforcing rib 36 is set to be the same or thicker than the thickness b of the support wall 31. Here, when the thickness a of the first reinforcing rib 36 is less than the thickness b of the support wall 31, the amount of contraction of the outer surface 34 of the support wall 31 including the first reinforcement rib 36 and the amount of contraction of the inner surface 33 are between. A big difference arises and the support wall 31 will fall down so that it may curve to the inner surface 33 side. On the other hand, when the thickness a of the first reinforcing rib 36 is set to be equal to or greater than the thickness b of the support wall 31, the contraction amount of the outer surface 34 of the support wall 31 and the contraction amount of the inner surface 33 are balanced. For this reason, when the synthetic resin contracts, a difference in contraction between the inner surface 33 and the outer surface 34 is less likely to occur, and the support wall 31 is prevented from falling so as to bend toward the inner surface 33 side. In addition, the thickness of the frame rib 35 is set to the same value as the thickness of the first reinforcing rib 36, and the difference in shrinkage due to the frame rib 35 is also suppressed.

  In the bearing body 13, not only the shrinkage is balanced between the inner surface 33 and the outer surface 34 of the support wall 31, but also the substrate 23 and the short side wall 24 of the base 21 integrated with the base end portion of the support wall 31. Similar considerations have been made. That is, the thickness b of the support wall 31 is equal to the thickness c of the substrate 23 and the thickness d of the short side wall 24 in order to balance the shrinkage between the support wall 31 and the substrate 23 and the short side wall 24. . On the other hand, the thickness e of the third reinforcing rib 39 is less likely to affect the difference in shrinkage between the inner surface 33 and the outer surface 34 of the support wall 31, and therefore is greater than the thickness c of the substrate 23 and the thickness d of the short side wall 24. It is said to be thin. In addition, the thickness of the rib provided in order to reinforce the wall part with respect to the thickness of the site | part which comprises a wall part in this way is conventionally performed. In the bearing body 13, one characteristic configuration is provided in a portion where the thickness of the first reinforcing rib 36 that is conventionally thinner than the thickness of the support wall 31 is the same as or thicker than the thickness of the support wall 31. Have.

  Further, in the bearing body 13, the height (length) of the first reinforcing rib 36 from the outer surface 34 of the support wall 31 is set so that the outer surface 34 of the support wall 31 in the stepped portion 41 has a short side surface 27 of the base 21. It is set to be longer than the length up to. In this case, a part of the length set to provide the first reinforcing rib 36 is used as an amount (length) for bringing the support wall 31 toward the side edge of the standing surface 26. In other words, compared with the case where the tip of the first reinforcing rib 36 and the short side surface 27 are aligned at the same position, the amount (length) of moving the support wall 31 toward the center of the standing surface 26 is reduced. For this reason, it becomes possible to arrange the support wall 31 as close to the side edge of the standing surface 26 as possible.

The effects exhibited by the above embodiment will be described below.
(1) According to the bearing body 13 of the embodiment, the step portion 41 is formed between the outer surface 34 of the support wall 31 and the short side surface 27 of the base body 21, whereby the base end portion of the support wall 31 and the base body 21 substrates 23 are formed to have a T-shaped cross section. For this reason, when the synthetic resin contracts, a difference in contraction amount due to the difference in shape between the inner surface 33 side and the outer surface 34 side of the support wall 31 hardly occurs. Therefore, the falling of the support wall 31 toward the inner surface 33 can be suppressed, and the molding accuracy can be improved.

  (2) The thickness a of the first reinforcing rib 36 and the thickness of the frame rib 35 are the same or thicker than the thickness b of the support wall 31. For this reason, it becomes difficult to produce a difference in shrinkage between the inner surface 33 and the outer surface 34 of the support wall 31 during the shrinkage of the synthetic resin, and the support wall 31 can be prevented from falling so as to bend toward the inner surface 33 side. The accuracy can be improved.

  (3) Further, the thickness b of the support wall 31 is set equal to the thickness c of the substrate 23 and the thickness d of the short side wall 24. For this reason, it is possible to suppress the support wall 31 from falling toward the inner surface 33 due to the thickness difference between the substrate 23 and the short side wall 24.

  (4) The support wall 31 is supported from the inner surface 33 side by the second reinforcing rib 38. For this reason, the support wall 31 can be physically supported from the inner surface 33 side, and the fall of the support wall 31 to the inner surface 33 side can be suitably suppressed.

  (5) Even when a material having a large shrinkage amount such as a crystalline resin is used, the shape of the support wall 31 is changed by changing the shape of the base end portion of the support wall 31 and the thickness of the first reinforcing rib 36. The fall to the inner surface 33 side can be suitably suppressed.

  (6) Even when a thermoplastic resin having a molding shrinkage rate of 0.006 or more is used, the support wall 31 can be changed by changing the shape of the base end portion of the support wall 31 and the thickness of the first reinforcing rib 36. Can be suitably suppressed from falling to the inner surface 33 side.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
-As the synthetic resin, a thermoplastic resin having a molding shrinkage of 0.006 or less may be used. Examples of the thermoplastic resin having a molding shrinkage of 0.006 or less include ABS resin, styrene resin, and polyethylene. Even in the case of such a configuration, the effects (1) to (4) can be obtained.

-As the synthetic resin, an amorphous resin other than the crystalline resin may be used. Even in the case of such a configuration, the effects (1) to (4) can be obtained.
-The second reinforcing rib 38 may be omitted. Even in the case of such a configuration, the effects (1) to (3) can be obtained.

  The thickness b of the support wall 31 may be thicker or thinner than the thickness c of the substrate 23 and the thickness d of the short side wall 24. Even in the case of such a configuration, the effect (1) or (2) can be obtained.

  -The thickness of the first reinforcing rib 36 may be kept thinner than the thickness of the support wall 31 as usual, and the fall of the support wall 31 may be suppressed only by providing the stepped portion 41. Even in the case of such a configuration, the effect (1) can be obtained.

  The collapse of the support wall 31 may be suppressed only by omitting the step portion 41 and making the thickness of the first reinforcing rib 36 equal to or greater than the thickness of the support wall 31. Even in the case of such a configuration, the effect (2) can be obtained.

  The molded body is not limited to the bearing body 13 as long as it is used as a vehicle part. For example, if it is a console box, you may apply said structure to the box etc. which comprise accommodation space. Alternatively, the present invention is not limited to the console box and may be applied to any vehicle part such as an instrument panel and a glove box as long as a pair of wall bodies are erected on the surface of the base.

The first reinforcing rib 36 and the third reinforcing rib 39 are not limited to being provided in a lattice shape, and may be provided in a honeycomb shape.
Further, the technical idea that can be grasped from the embodiment will be described below.

- the length of the reinforcing ribs from the outer surface of the wall, formed form characterized in that the outer surface of the wall of the stepped portion is longer than the length up to the side surface of the substrate.

Sectional drawing which shows the bearing body of embodiment. The side view which shows the bearing body of embodiment. (A) is a perspective view which shows the bearing body of embodiment, (b) is a bottom view which shows the bearing body of embodiment. (A) is a side view which shows the state which closed the console box provided with the bearing body of embodiment, (b) is a side view which shows the state which open | released the console box provided with the bearing body of embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 21 ... Base | substrate, 26 ... Standing surface, 31 ... Support wall as a wall body, 33 ... Inner surface, 34 ... Outer surface, 38 ... 2nd reinforcement rib, 41 ... Step part.

Claims (6)

A synthetic resin molded body that is used as a vehicle component and has a pair of shaft supports each provided with a flat wall on a surface of a rectangular base body so as to face each other. ,
Of the surface of the base body, the surface that erects the wall body is the erecting surface, while the surface that extends in the direction intersecting the erecting surface is the side surface,
Of the surface of the wall body, the surface opposite to each other is the inner surface, while the surface facing the inner surface is the outer surface,
Forming a first reinforcing rib for reinforcing the wall on the outer surface of the wall;
The thickness of the first reinforcing rib is the same or thicker than the thickness of the wall body,
The shaft support is pivotally supported with respect to an object, and is configured as a bearing body that is a vehicle component by the shaft support and the base .
A third reinforcing rib for reinforcing the base is formed on the surface of the base opposite to the standing surface, and the thickness of the third reinforcing rib is set to the thickness of the first reinforcing rib. A molded product characterized in that it is thinner than its thickness .   The molded body according to claim 1, wherein a step portion is formed between a side surface of the base body and an outer surface of the wall body. The molded body according to claim 1 or 2, wherein a second reinforcing rib is provided between the standing surface of the base body and the inner surface of the wall body. The said synthetic resin is crystalline resin, The molded object as described in any one of Claims 1-3 characterized by the above-mentioned. The said synthetic resin is a thermoplastic resin, The molding shrinkage rate is 0.006 or more, The molded object as described in any one of Claims 1-4 characterized by the above-mentioned. The molded body according to any one of claims 1 to 5, wherein a thickness of the wall body is the same as a thickness of the base body.

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